Include NanoVG into LaGUI

CMakeLists.txt

@@ -45,6 +45,11 @@ list(APPEND HEADER_FILES ${wintabfiles})
 include_directories(wintab)
 endif()
 
+list(APPEND SOURCE_FILES ./nanovg/nanovg.c)
+file(GLOB nvgfiles ./nanovg/*.h )
+list(APPEND HEADER_FILES ${nvgfiles})
+include_directories(nanovg)
+
 set(LAGUI_FONTS
     "fonts/NotoEmoji-Regular.ttf"
     "fonts/NotoSansCJK-Regular.ttc"

la_5.h

@@ -35,7 +35,6 @@
 //#include "la_icon.h"
 #include "la_tns.h"
 
-
 #ifdef __cplusplus
     }
 #endif
@@ -55,3 +54,6 @@
 #include <locale.h>
 #include <sys/stat.h>
 #include <time.h>
+
+#include "nanovg.h"
+#include "nanovg_gl.h"

la_kernel.c

@@ -1724,7 +1724,7 @@ void la_PanelDrawToOffsceen(laPanel *p, laUiList *uil){
     laEnsurePanelInBound(p,p->MenuRefer?p->MenuRefer:&p->UI);
     if (!p->OffScr){
         int GLFormat=(p->PanelTemplate&&p->PanelTemplate->DefaultGLFormat)?p->PanelTemplate->DefaultGLFormat:GL_RGBA8;
-        p->OffScr = tnsCreate2DOffscreen(GLFormat, p->W, p->H, MAIN.PanelMultisample, 0);
+        p->OffScr = tnsCreate2DOffscreen(GLFormat, p->W, p->H, MAIN.PanelMultisample, 0,0);
     }
     tnsDrawToOffscreen(p->OffScr, 1, 0);
 }

la_tns.h

@@ -350,7 +350,6 @@ struct _tnsOffscreen
 
     tnsTexture *pColor[16];
     tnsTexture *pDepth;
-    tnsTexture *pStencil;
 
     GLuint FboHandle;
 
@@ -940,6 +939,8 @@ void tnsInitBuiltinShaders();
 void tnsInitWindowDefaultRenderConfig();
 void tnsQuit();
 
+void tnsRestoreFromNanoVG();
+
 real *tnsGetModelMatrix();
 real *tnsGetViewMatrix();
 real *tnsGetProjectionMatrix();
@@ -1256,7 +1257,7 @@ tnsTexture *tnsCreate3DTexture(GLint glInternalFormat, int w, int h, int slices)
 void tnsConfigure2DTexture(tnsTexture *t);
 void tnsConfigure3DTexture(tnsTexture *t);
 void tnsReconfigureTextureParameters(int Multisample);
-tnsOffscreen *tnsCreate2DOffscreen(int glInternalFormat, int w, int h, int Multisample, int WithDepth);
+tnsOffscreen *tnsCreate2DOffscreen(int glInternalFormat, int w, int h, int Multisample, int WithDepth, int WithStencil);
 tnsOffscreen *tnsCreateDeferredOffscreen(int w, int h);
 void tnsCopyScreenTo2DTexture(tnsTexture *target, int x_lower_left, int y_lower_left, int w, int h);
 void tnsActiveTexture(GLenum tex);

la_tns_kernel.c

@@ -1385,6 +1385,13 @@ void tnsQuit(){
     memFree(T);
 }
 
+void tnsRestoreFromNanoVG(){
+    glBindVertexArray(T->GlobalVAO);
+    tnsUseImmShader(); tnsEnableShaderv(T->immShader);
+	glActiveTexture(GL_TEXTURE0);
+    glBlendFuncSeparate(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA,GL_ONE,GL_ONE_MINUS_SRC_ALPHA);
+}
+
 tnsMatrixStackItem *tKnlGetCurrentMatStackItem(){
     return &T->stack.level[T->stack.current_level];
 }
@@ -1655,10 +1662,11 @@ void tnsConfigure2DTexture(tnsTexture *t){
     }else{
         int isDepth=t->GLTexBitsType==GL_DEPTH_COMPONENT||t->GLTexBitsType==GL_DEPTH_COMPONENT16||
             t->GLTexBitsType==GL_DEPTH_COMPONENT24||t->GLTexBitsType==GL_DEPTH_COMPONENT32F;
-        int format=isDepth?GL_DEPTH_COMPONENT:GL_RGBA;
+        int format=isDepth?GL_DEPTH_COMPONENT:GL_RGBA; int type=GL_UNSIGNED_BYTE;
+        if(t->GLTexBitsType==GL_DEPTH_STENCIL){ format=GL_DEPTH_STENCIL; type=GL_UNSIGNED_INT_24_8_EXT; }
         if(t->Multisample) glTexImage2DMultisample(GL_TEXTURE_2D_MULTISAMPLE, t->Multisample, t->GLTexBitsType, t->Width, t->Height, GL_TRUE);
-        else{ glTexImage2D(GL_TEXTURE_2D, 0, t->GLTexBitsType, t->Width, t->Height, 0, format, GL_UNSIGNED_BYTE, 0);
-            int a=a=glGetError();
+        else{ glTexImage2D(GL_TEXTURE_2D, 0, t->GLTexBitsType, t->Width, t->Height, 0, format, type, 0);
+            int a=glGetError();
             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
             glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
@@ -2407,7 +2415,7 @@ void tnsAttach2DOffscreenBuffer(tnsOffscreen *target, GLuint attatchment, tnsTex
         target->pColor[attatchment - GL_COLOR_ATTACHMENT0] = use;
         tnsUnbindTexture();
         glBindFramebuffer(GL_FRAMEBUFFER, 0);
-    }elif (attatchment == GL_DEPTH_ATTACHMENT){
+    }elif (attatchment == GL_DEPTH_ATTACHMENT || attatchment==GL_STENCIL_ATTACHMENT){
         //if (target->pDepth) return;
         glBindFramebuffer(GL_FRAMEBUFFER, target->FboHandle);
         tnsBindTexture(use);
@@ -2439,7 +2447,7 @@ void tnsDetach2DOffscreenBuffer(tnsOffscreen *target, GLuint which_attach_point)
         tnsDeleteTexture(target->pColor[which_attach_point - GL_COLOR_ATTACHMENT0]);
 
         target->pColor[which_attach_point - GL_COLOR_ATTACHMENT0] = 0;
-    }elif (which_attach_point == GL_DEPTH_ATTACHMENT){
+    }elif (which_attach_point == GL_DEPTH_ATTACHMENT || which_attach_point==GL_STENCIL_ATTACHMENT){
         if (target->pDepth) return;
 
         glBindFramebuffer(GL_FRAMEBUFFER, target->FboHandle);
@@ -2453,7 +2461,7 @@ void tnsDetach2DOffscreenBuffer(tnsOffscreen *target, GLuint which_attach_point)
     tnsUnbindTexture();
 }
 
-tnsOffscreen *tnsCreate2DOffscreen(int glInternalFormat, int w, int h, int Multisample, int WithDepth){
+tnsOffscreen *tnsCreate2DOffscreen(int glInternalFormat, int w, int h, int Multisample, int WithDepth, int WithStencil){
     tnsOffscreen *toff = tnsCreateOffscreenHandle();
     tnsTexture *color; tnsTexture *depth;
 
@@ -2461,9 +2469,12 @@ tnsOffscreen *tnsCreate2DOffscreen(int glInternalFormat, int w, int h, int Multi
         color = tnsCreate2DTexture(glInternalFormat, w, h, Multisample);
         tnsAttach2DOffscreenBuffer(toff, GL_COLOR_ATTACHMENT0, color);
     }
-    if(WithDepth){
-        depth = tnsCreate2DTexture(GL_DEPTH_COMPONENT, w, h, Multisample);
+    if(WithDepth || WithStencil){
+        int format=GL_DEPTH_COMPONENT;
+        if(WithStencil){ format=GL_DEPTH_STENCIL; }
+        depth = tnsCreate2DTexture(format, w, h, Multisample);
         tnsAttach2DOffscreenBuffer(toff, GL_DEPTH_ATTACHMENT, depth);
+        if(WithStencil){ tnsAttach2DOffscreenBuffer(toff, GL_STENCIL_ATTACHMENT, depth); }
     }
 
     return toff;
@@ -4137,7 +4148,7 @@ void tnsRGB2HCY(real *rgb, real *hcy){
 }
 
 void tnsClearAll(){
-    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
+    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT|GL_STENCIL_BUFFER_BIT);
 }
 void tnsClearColorv(real *rgba){
     glClearColor(rgba[0], rgba[1], rgba[2], rgba[3]);

nanovg/fontstash.h

@@ -0,0 +1,1792 @@
+//
+// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#ifndef FONS_H
+#define FONS_H
+
+#define FONS_INVALID -1
+
+enum FONSflags {
+	FONS_ZERO_TOPLEFT = 1,
+	FONS_ZERO_BOTTOMLEFT = 2,
+};
+
+enum FONSalign {
+	// Horizontal align
+	FONS_ALIGN_LEFT 	= 1<<0,	// Default
+	FONS_ALIGN_CENTER 	= 1<<1,
+	FONS_ALIGN_RIGHT 	= 1<<2,
+	// Vertical align
+	FONS_ALIGN_TOP 		= 1<<3,
+	FONS_ALIGN_MIDDLE	= 1<<4,
+	FONS_ALIGN_BOTTOM	= 1<<5,
+	FONS_ALIGN_BASELINE	= 1<<6, // Default
+};
+
+enum FONSglyphBitmap {
+	FONS_GLYPH_BITMAP_OPTIONAL = 1,
+	FONS_GLYPH_BITMAP_REQUIRED = 2,
+};
+
+enum FONSerrorCode {
+	// Font atlas is full.
+	FONS_ATLAS_FULL = 1,
+	// Scratch memory used to render glyphs is full, requested size reported in 'val', you may need to bump up FONS_SCRATCH_BUF_SIZE.
+	FONS_SCRATCH_FULL = 2,
+	// Calls to fonsPushState has created too large stack, if you need deep state stack bump up FONS_MAX_STATES.
+	FONS_STATES_OVERFLOW = 3,
+	// Trying to pop too many states fonsPopState().
+	FONS_STATES_UNDERFLOW = 4,
+};
+
+struct FONSparams {
+	int width, height;
+	unsigned char flags;
+	void* userPtr;
+	int (*renderCreate)(void* uptr, int width, int height);
+	int (*renderResize)(void* uptr, int width, int height);
+	void (*renderUpdate)(void* uptr, int* rect, const unsigned char* data);
+	void (*renderDraw)(void* uptr, const float* verts, const float* tcoords, const unsigned int* colors, int nverts);
+	void (*renderDelete)(void* uptr);
+};
+typedef struct FONSparams FONSparams;
+
+struct FONSquad
+{
+	float x0,y0,s0,t0;
+	float x1,y1,s1,t1;
+};
+typedef struct FONSquad FONSquad;
+
+struct FONStextIter {
+	float x, y, nextx, nexty, scale, spacing;
+	unsigned int codepoint;
+	short isize, iblur;
+	struct FONSfont* font;
+	int prevGlyphIndex;
+	const char* str;
+	const char* next;
+	const char* end;
+	unsigned int utf8state;
+	int bitmapOption;
+};
+typedef struct FONStextIter FONStextIter;
+
+typedef struct FONScontext FONScontext;
+
+// Constructor and destructor.
+FONScontext* fonsCreateInternal(FONSparams* params);
+void fonsDeleteInternal(FONScontext* s);
+
+void fonsSetErrorCallback(FONScontext* s, void (*callback)(void* uptr, int error, int val), void* uptr);
+// Returns current atlas size.
+void fonsGetAtlasSize(FONScontext* s, int* width, int* height);
+// Expands the atlas size.
+int fonsExpandAtlas(FONScontext* s, int width, int height);
+// Resets the whole stash.
+int fonsResetAtlas(FONScontext* stash, int width, int height);
+
+// Add fonts
+int fonsAddFont(FONScontext* s, const char* name, const char* path, int fontIndex);
+int fonsAddFontMem(FONScontext* s, const char* name, unsigned char* data, int ndata, int freeData, int fontIndex);
+int fonsGetFontByName(FONScontext* s, const char* name);
+
+// State handling
+void fonsPushState(FONScontext* s);
+void fonsPopState(FONScontext* s);
+void fonsClearState(FONScontext* s);
+
+// State setting
+void fonsSetSize(FONScontext* s, float size);
+void fonsSetColor(FONScontext* s, unsigned int color);
+void fonsSetSpacing(FONScontext* s, float spacing);
+void fonsSetBlur(FONScontext* s, float blur);
+void fonsSetAlign(FONScontext* s, int align);
+void fonsSetFont(FONScontext* s, int font);
+
+// Draw text
+float fonsDrawText(FONScontext* s, float x, float y, const char* string, const char* end);
+
+// Measure text
+float fonsTextBounds(FONScontext* s, float x, float y, const char* string, const char* end, float* bounds);
+void fonsLineBounds(FONScontext* s, float y, float* miny, float* maxy);
+void fonsVertMetrics(FONScontext* s, float* ascender, float* descender, float* lineh);
+
+// Text iterator
+int fonsTextIterInit(FONScontext* stash, FONStextIter* iter, float x, float y, const char* str, const char* end, int bitmapOption);
+int fonsTextIterNext(FONScontext* stash, FONStextIter* iter, struct FONSquad* quad);
+
+// Pull texture changes
+const unsigned char* fonsGetTextureData(FONScontext* stash, int* width, int* height);
+int fonsValidateTexture(FONScontext* s, int* dirty);
+
+// Draws the stash texture for debugging
+void fonsDrawDebug(FONScontext* s, float x, float y);
+
+#endif // FONTSTASH_H
+
+
+#ifdef FONTSTASH_IMPLEMENTATION
+
+#define FONS_NOTUSED(v)  (void)sizeof(v)
+
+#ifdef FONS_USE_FREETYPE
+
+#include <ft2build.h>
+#include FT_FREETYPE_H
+#include FT_ADVANCES_H
+#include <math.h>
+
+struct FONSttFontImpl {
+	FT_Face font;
+};
+typedef struct FONSttFontImpl FONSttFontImpl;
+
+#else
+
+#define STB_TRUETYPE_IMPLEMENTATION
+
+static void* fons__tmpalloc(size_t size, void* up);
+static void fons__tmpfree(void* ptr, void* up);
+#define STBTT_malloc(x,u)    fons__tmpalloc(x,u)
+#define STBTT_free(x,u)      fons__tmpfree(x,u)
+#include "stb_truetype.h"
+
+struct FONSttFontImpl {
+	stbtt_fontinfo font;
+};
+typedef struct FONSttFontImpl FONSttFontImpl;
+
+#endif
+
+#ifndef FONS_SCRATCH_BUF_SIZE
+#	define FONS_SCRATCH_BUF_SIZE 96000
+#endif
+#ifndef FONS_HASH_LUT_SIZE
+#	define FONS_HASH_LUT_SIZE 256
+#endif
+#ifndef FONS_INIT_FONTS
+#	define FONS_INIT_FONTS 4
+#endif
+#ifndef FONS_INIT_GLYPHS
+#	define FONS_INIT_GLYPHS 256
+#endif
+#ifndef FONS_INIT_ATLAS_NODES
+#	define FONS_INIT_ATLAS_NODES 256
+#endif
+#ifndef FONS_VERTEX_COUNT
+#	define FONS_VERTEX_COUNT 1024
+#endif
+#ifndef FONS_MAX_STATES
+#	define FONS_MAX_STATES 20
+#endif
+#ifndef FONS_MAX_FALLBACKS
+#	define FONS_MAX_FALLBACKS 20
+#endif
+
+static unsigned int fons__hashint(unsigned int a)
+{
+	a += ~(a<<15);
+	a ^=  (a>>10);
+	a +=  (a<<3);
+	a ^=  (a>>6);
+	a += ~(a<<11);
+	a ^=  (a>>16);
+	return a;
+}
+
+static int fons__mini(int a, int b)
+{
+	return a < b ? a : b;
+}
+
+static int fons__maxi(int a, int b)
+{
+	return a > b ? a : b;
+}
+
+struct FONSglyph
+{
+	unsigned int codepoint;
+	int index;
+	int next;
+	short size, blur;
+	short x0,y0,x1,y1;
+	short xadv,xoff,yoff;
+};
+typedef struct FONSglyph FONSglyph;
+
+struct FONSfont
+{
+	FONSttFontImpl font;
+	char name[64];
+	unsigned char* data;
+	int dataSize;
+	unsigned char freeData;
+	float ascender;
+	float descender;
+	float lineh;
+	FONSglyph* glyphs;
+	int cglyphs;
+	int nglyphs;
+	int lut[FONS_HASH_LUT_SIZE];
+	int fallbacks[FONS_MAX_FALLBACKS];
+	int nfallbacks;
+};
+typedef struct FONSfont FONSfont;
+
+struct FONSstate
+{
+	int font;
+	int align;
+	float size;
+	unsigned int color;
+	float blur;
+	float spacing;
+};
+typedef struct FONSstate FONSstate;
+
+struct FONSatlasNode {
+    short x, y, width;
+};
+typedef struct FONSatlasNode FONSatlasNode;
+
+struct FONSatlas
+{
+	int width, height;
+	FONSatlasNode* nodes;
+	int nnodes;
+	int cnodes;
+};
+typedef struct FONSatlas FONSatlas;
+
+struct FONScontext
+{
+	FONSparams params;
+	float itw,ith;
+	unsigned char* texData;
+	int dirtyRect[4];
+	FONSfont** fonts;
+	FONSatlas* atlas;
+	int cfonts;
+	int nfonts;
+	float verts[FONS_VERTEX_COUNT*2];
+	float tcoords[FONS_VERTEX_COUNT*2];
+	unsigned int colors[FONS_VERTEX_COUNT];
+	int nverts;
+	unsigned char* scratch;
+	int nscratch;
+	FONSstate states[FONS_MAX_STATES];
+	int nstates;
+	void (*handleError)(void* uptr, int error, int val);
+	void* errorUptr;
+#ifdef FONS_USE_FREETYPE
+	FT_Library ftLibrary;
+#endif
+};
+
+#ifdef FONS_USE_FREETYPE
+
+int fons__tt_init(FONScontext *context)
+{
+	FT_Error ftError;
+	FONS_NOTUSED(context);
+	ftError = FT_Init_FreeType(&context->ftLibrary);
+	return ftError == 0;
+}
+
+int fons__tt_done(FONScontext *context)
+{
+	FT_Error ftError;
+	FONS_NOTUSED(context);
+	ftError = FT_Done_FreeType(context->ftLibrary);
+	return ftError == 0;
+}
+
+int fons__tt_loadFont(FONScontext *context, FONSttFontImpl *font, unsigned char *data, int dataSize, int fontIndex)
+{
+	FT_Error ftError;
+	FONS_NOTUSED(context);
+
+	ftError = FT_New_Memory_Face(context->ftLibrary, (const FT_Byte*)data, dataSize, fontIndex, &font->font);
+	return ftError == 0;
+}
+
+void fons__tt_getFontVMetrics(FONSttFontImpl *font, int *ascent, int *descent, int *lineGap)
+{
+	*ascent = font->font->ascender;
+	*descent = font->font->descender;
+	*lineGap = font->font->height - (*ascent - *descent);
+}
+
+float fons__tt_getPixelHeightScale(FONSttFontImpl *font, float size)
+{
+	return size / font->font->units_per_EM;
+}
+
+int fons__tt_getGlyphIndex(FONSttFontImpl *font, int codepoint)
+{
+	return FT_Get_Char_Index(font->font, codepoint);
+}
+
+int fons__tt_buildGlyphBitmap(FONSttFontImpl *font, int glyph, float size, float scale,
+							  int *advance, int *lsb, int *x0, int *y0, int *x1, int *y1)
+{
+	FT_Error ftError;
+	FT_GlyphSlot ftGlyph;
+	FT_Fixed advFixed;
+	FONS_NOTUSED(scale);
+
+	ftError = FT_Set_Pixel_Sizes(font->font, 0, size);
+	if (ftError) return 0;
+	ftError = FT_Load_Glyph(font->font, glyph, FT_LOAD_RENDER | FT_LOAD_FORCE_AUTOHINT | FT_LOAD_TARGET_LIGHT);
+	if (ftError) return 0;
+	ftError = FT_Get_Advance(font->font, glyph, FT_LOAD_NO_SCALE, &advFixed);
+	if (ftError) return 0;
+	ftGlyph = font->font->glyph;
+	*advance = (int)advFixed;
+	*lsb = (int)ftGlyph->metrics.horiBearingX;
+	*x0 = ftGlyph->bitmap_left;
+	*x1 = *x0 + ftGlyph->bitmap.width;
+	*y0 = -ftGlyph->bitmap_top;
+	*y1 = *y0 + ftGlyph->bitmap.rows;
+	return 1;
+}
+
+void fons__tt_renderGlyphBitmap(FONSttFontImpl *font, unsigned char *output, int outWidth, int outHeight, int outStride,
+								float scaleX, float scaleY, int glyph)
+{
+	FT_GlyphSlot ftGlyph = font->font->glyph;
+	int ftGlyphOffset = 0;
+	unsigned int x, y;
+	FONS_NOTUSED(outWidth);
+	FONS_NOTUSED(outHeight);
+	FONS_NOTUSED(scaleX);
+	FONS_NOTUSED(scaleY);
+	FONS_NOTUSED(glyph);	// glyph has already been loaded by fons__tt_buildGlyphBitmap
+
+	for ( y = 0; y < ftGlyph->bitmap.rows; y++ ) {
+		for ( x = 0; x < ftGlyph->bitmap.width; x++ ) {
+			output[(y * outStride) + x] = ftGlyph->bitmap.buffer[ftGlyphOffset++];
+		}
+	}
+}
+
+int fons__tt_getGlyphKernAdvance(FONSttFontImpl *font, int glyph1, int glyph2)
+{
+	FT_Vector ftKerning;
+	FT_Get_Kerning(font->font, glyph1, glyph2, FT_KERNING_DEFAULT, &ftKerning);
+	return (int)((ftKerning.x + 32) >> 6);  // Round up and convert to integer
+}
+
+#else
+
+int fons__tt_init(FONScontext *context)
+{
+	FONS_NOTUSED(context);
+	return 1;
+}
+
+int fons__tt_done(FONScontext *context)
+{
+	FONS_NOTUSED(context);
+	return 1;
+}
+
+int fons__tt_loadFont(FONScontext *context, FONSttFontImpl *font, unsigned char *data, int dataSize, int fontIndex)
+{
+	int offset, stbError;
+	FONS_NOTUSED(dataSize);
+
+	font->font.userdata = context;
+	offset = stbtt_GetFontOffsetForIndex(data, fontIndex);
+	if (offset == -1) {
+		stbError = 0;
+	} else {
+		stbError = stbtt_InitFont(&font->font, data, offset);
+	}
+	return stbError;
+}
+
+void fons__tt_getFontVMetrics(FONSttFontImpl *font, int *ascent, int *descent, int *lineGap)
+{
+	stbtt_GetFontVMetrics(&font->font, ascent, descent, lineGap);
+}
+
+float fons__tt_getPixelHeightScale(FONSttFontImpl *font, float size)
+{
+	return stbtt_ScaleForMappingEmToPixels(&font->font, size);
+}
+
+int fons__tt_getGlyphIndex(FONSttFontImpl *font, int codepoint)
+{
+	return stbtt_FindGlyphIndex(&font->font, codepoint);
+}
+
+int fons__tt_buildGlyphBitmap(FONSttFontImpl *font, int glyph, float size, float scale,
+							  int *advance, int *lsb, int *x0, int *y0, int *x1, int *y1)
+{
+	FONS_NOTUSED(size);
+	stbtt_GetGlyphHMetrics(&font->font, glyph, advance, lsb);
+	stbtt_GetGlyphBitmapBox(&font->font, glyph, scale, scale, x0, y0, x1, y1);
+	return 1;
+}
+
+void fons__tt_renderGlyphBitmap(FONSttFontImpl *font, unsigned char *output, int outWidth, int outHeight, int outStride,
+								float scaleX, float scaleY, int glyph)
+{
+	stbtt_MakeGlyphBitmap(&font->font, output, outWidth, outHeight, outStride, scaleX, scaleY, glyph);
+}
+
+int fons__tt_getGlyphKernAdvance(FONSttFontImpl *font, int glyph1, int glyph2)
+{
+	return stbtt_GetGlyphKernAdvance(&font->font, glyph1, glyph2);
+}
+
+#endif
+
+#ifdef STB_TRUETYPE_IMPLEMENTATION
+
+static void* fons__tmpalloc(size_t size, void* up)
+{
+	unsigned char* ptr;
+	FONScontext* stash = (FONScontext*)up;
+
+	// 16-byte align the returned pointer
+	size = (size + 0xf) & ~0xf;
+
+	if (stash->nscratch+(int)size > FONS_SCRATCH_BUF_SIZE) {
+		if (stash->handleError)
+			stash->handleError(stash->errorUptr, FONS_SCRATCH_FULL, stash->nscratch+(int)size);
+		return NULL;
+	}
+	ptr = stash->scratch + stash->nscratch;
+	stash->nscratch += (int)size;
+	return ptr;
+}
+
+static void fons__tmpfree(void* ptr, void* up)
+{
+	(void)ptr;
+	(void)up;
+	// empty
+}
+
+#endif // STB_TRUETYPE_IMPLEMENTATION
+
+// Copyright (c) 2008-2010 Bjoern Hoehrmann <bjoern@hoehrmann.de>
+// See http://bjoern.hoehrmann.de/utf-8/decoder/dfa/ for details.
+
+#define FONS_UTF8_ACCEPT 0
+#define FONS_UTF8_REJECT 12
+
+static unsigned int fons__decutf8(unsigned int* state, unsigned int* codep, unsigned int byte)
+{
+	static const unsigned char utf8d[] = {
+		// The first part of the table maps bytes to character classes that
+		// to reduce the size of the transition table and create bitmasks.
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,  0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,0,
+		1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,  9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,9,
+		7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,  7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,7,
+		8,8,2,2,2,2,2,2,2,2,2,2,2,2,2,2,  2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,2,
+		10,3,3,3,3,3,3,3,3,3,3,3,3,4,3,3, 11,6,6,6,5,8,8,8,8,8,8,8,8,8,8,8,
+
+		// The second part is a transition table that maps a combination
+		// of a state of the automaton and a character class to a state.
+		0,12,24,36,60,96,84,12,12,12,48,72, 12,12,12,12,12,12,12,12,12,12,12,12,
+		12, 0,12,12,12,12,12, 0,12, 0,12,12, 12,24,12,12,12,12,12,24,12,24,12,12,
+		12,12,12,12,12,12,12,24,12,12,12,12, 12,24,12,12,12,12,12,12,12,24,12,12,
+		12,12,12,12,12,12,12,36,12,36,12,12, 12,36,12,12,12,12,12,36,12,36,12,12,
+		12,36,12,12,12,12,12,12,12,12,12,12,
+    };
+
+	unsigned int type = utf8d[byte];
+
+    *codep = (*state != FONS_UTF8_ACCEPT) ?
+		(byte & 0x3fu) | (*codep << 6) :
+		(0xff >> type) & (byte);
+
+	*state = utf8d[256 + *state + type];
+	return *state;
+}
+
+// Atlas based on Skyline Bin Packer by Jukka Jylänki
+
+static void fons__deleteAtlas(FONSatlas* atlas)
+{
+	if (atlas == NULL) return;
+	if (atlas->nodes != NULL) free(atlas->nodes);
+	free(atlas);
+}
+
+static FONSatlas* fons__allocAtlas(int w, int h, int nnodes)
+{
+	FONSatlas* atlas = NULL;
+
+	// Allocate memory for the font stash.
+	atlas = (FONSatlas*)malloc(sizeof(FONSatlas));
+	if (atlas == NULL) goto error;
+	memset(atlas, 0, sizeof(FONSatlas));
+
+	atlas->width = w;
+	atlas->height = h;
+
+	// Allocate space for skyline nodes
+	atlas->nodes = (FONSatlasNode*)malloc(sizeof(FONSatlasNode) * nnodes);
+	if (atlas->nodes == NULL) goto error;
+	memset(atlas->nodes, 0, sizeof(FONSatlasNode) * nnodes);
+	atlas->nnodes = 0;
+	atlas->cnodes = nnodes;
+
+	// Init root node.
+	atlas->nodes[0].x = 0;
+	atlas->nodes[0].y = 0;
+	atlas->nodes[0].width = (short)w;
+	atlas->nnodes++;
+
+	return atlas;
+
+error:
+	if (atlas) fons__deleteAtlas(atlas);
+	return NULL;
+}
+
+static int fons__atlasInsertNode(FONSatlas* atlas, int idx, int x, int y, int w)
+{
+	int i;
+	// Insert node
+	if (atlas->nnodes+1 > atlas->cnodes) {
+		atlas->cnodes = atlas->cnodes == 0 ? 8 : atlas->cnodes * 2;
+		atlas->nodes = (FONSatlasNode*)realloc(atlas->nodes, sizeof(FONSatlasNode) * atlas->cnodes);
+		if (atlas->nodes == NULL)
+			return 0;
+	}
+	for (i = atlas->nnodes; i > idx; i--)
+		atlas->nodes[i] = atlas->nodes[i-1];
+	atlas->nodes[idx].x = (short)x;
+	atlas->nodes[idx].y = (short)y;
+	atlas->nodes[idx].width = (short)w;
+	atlas->nnodes++;
+
+	return 1;
+}
+
+static void fons__atlasRemoveNode(FONSatlas* atlas, int idx)
+{
+	int i;
+	if (atlas->nnodes == 0) return;
+	for (i = idx; i < atlas->nnodes-1; i++)
+		atlas->nodes[i] = atlas->nodes[i+1];
+	atlas->nnodes--;
+}
+
+static void fons__atlasExpand(FONSatlas* atlas, int w, int h)
+{
+	// Insert node for empty space
+	if (w > atlas->width)
+		fons__atlasInsertNode(atlas, atlas->nnodes, atlas->width, 0, w - atlas->width);
+	atlas->width = w;
+	atlas->height = h;
+}
+
+static void fons__atlasReset(FONSatlas* atlas, int w, int h)
+{
+	atlas->width = w;
+	atlas->height = h;
+	atlas->nnodes = 0;
+
+	// Init root node.
+	atlas->nodes[0].x = 0;
+	atlas->nodes[0].y = 0;
+	atlas->nodes[0].width = (short)w;
+	atlas->nnodes++;
+}
+
+static int fons__atlasAddSkylineLevel(FONSatlas* atlas, int idx, int x, int y, int w, int h)
+{
+	int i;
+
+	// Insert new node
+	if (fons__atlasInsertNode(atlas, idx, x, y+h, w) == 0)
+		return 0;
+
+	// Delete skyline segments that fall under the shadow of the new segment.
+	for (i = idx+1; i < atlas->nnodes; i++) {
+		if (atlas->nodes[i].x < atlas->nodes[i-1].x + atlas->nodes[i-1].width) {
+			int shrink = atlas->nodes[i-1].x + atlas->nodes[i-1].width - atlas->nodes[i].x;
+			atlas->nodes[i].x += (short)shrink;
+			atlas->nodes[i].width -= (short)shrink;
+			if (atlas->nodes[i].width <= 0) {
+				fons__atlasRemoveNode(atlas, i);
+				i--;
+			} else {
+				break;
+			}
+		} else {
+			break;
+		}
+	}
+
+	// Merge same height skyline segments that are next to each other.
+	for (i = 0; i < atlas->nnodes-1; i++) {
+		if (atlas->nodes[i].y == atlas->nodes[i+1].y) {
+			atlas->nodes[i].width += atlas->nodes[i+1].width;
+			fons__atlasRemoveNode(atlas, i+1);
+			i--;
+		}
+	}
+
+	return 1;
+}
+
+static int fons__atlasRectFits(FONSatlas* atlas, int i, int w, int h)
+{
+	// Checks if there is enough space at the location of skyline span 'i',
+	// and return the max height of all skyline spans under that at that location,
+	// (think tetris block being dropped at that position). Or -1 if no space found.
+	int x = atlas->nodes[i].x;
+	int y = atlas->nodes[i].y;
+	int spaceLeft;
+	if (x + w > atlas->width)
+		return -1;
+	spaceLeft = w;
+	while (spaceLeft > 0) {
+		if (i == atlas->nnodes) return -1;
+		y = fons__maxi(y, atlas->nodes[i].y);
+		if (y + h > atlas->height) return -1;
+		spaceLeft -= atlas->nodes[i].width;
+		++i;
+	}
+	return y;
+}
+
+static int fons__atlasAddRect(FONSatlas* atlas, int rw, int rh, int* rx, int* ry)
+{
+	int besth = atlas->height, bestw = atlas->width, besti = -1;
+	int bestx = -1, besty = -1, i;
+
+	// Bottom left fit heuristic.
+	for (i = 0; i < atlas->nnodes; i++) {
+		int y = fons__atlasRectFits(atlas, i, rw, rh);
+		if (y != -1) {
+			if (y + rh < besth || (y + rh == besth && atlas->nodes[i].width < bestw)) {
+				besti = i;
+				bestw = atlas->nodes[i].width;
+				besth = y + rh;
+				bestx = atlas->nodes[i].x;
+				besty = y;
+			}
+		}
+	}
+
+	if (besti == -1)
+		return 0;
+
+	// Perform the actual packing.
+	if (fons__atlasAddSkylineLevel(atlas, besti, bestx, besty, rw, rh) == 0)
+		return 0;
+
+	*rx = bestx;
+	*ry = besty;
+
+	return 1;
+}
+
+static void fons__addWhiteRect(FONScontext* stash, int w, int h)
+{
+	int x, y, gx, gy;
+	unsigned char* dst;
+	if (fons__atlasAddRect(stash->atlas, w, h, &gx, &gy) == 0)
+		return;
+
+	// Rasterize
+	dst = &stash->texData[gx + gy * stash->params.width];
+	for (y = 0; y < h; y++) {
+		for (x = 0; x < w; x++)
+			dst[x] = 0xff;
+		dst += stash->params.width;
+	}
+
+	stash->dirtyRect[0] = fons__mini(stash->dirtyRect[0], gx);
+	stash->dirtyRect[1] = fons__mini(stash->dirtyRect[1], gy);
+	stash->dirtyRect[2] = fons__maxi(stash->dirtyRect[2], gx+w);
+	stash->dirtyRect[3] = fons__maxi(stash->dirtyRect[3], gy+h);
+}
+
+FONScontext* fonsCreateInternal(FONSparams* params)
+{
+	FONScontext* stash = NULL;
+
+	// Allocate memory for the font stash.
+	stash = (FONScontext*)malloc(sizeof(FONScontext));
+	if (stash == NULL) goto error;
+	memset(stash, 0, sizeof(FONScontext));
+
+	stash->params = *params;
+
+	// Allocate scratch buffer.
+	stash->scratch = (unsigned char*)malloc(FONS_SCRATCH_BUF_SIZE);
+	if (stash->scratch == NULL) goto error;
+
+	// Initialize implementation library
+	if (!fons__tt_init(stash)) goto error;
+
+	if (stash->params.renderCreate != NULL) {
+		if (stash->params.renderCreate(stash->params.userPtr, stash->params.width, stash->params.height) == 0)
+			goto error;
+	}
+
+	stash->atlas = fons__allocAtlas(stash->params.width, stash->params.height, FONS_INIT_ATLAS_NODES);
+	if (stash->atlas == NULL) goto error;
+
+	// Allocate space for fonts.
+	stash->fonts = (FONSfont**)malloc(sizeof(FONSfont*) * FONS_INIT_FONTS);
+	if (stash->fonts == NULL) goto error;
+	memset(stash->fonts, 0, sizeof(FONSfont*) * FONS_INIT_FONTS);
+	stash->cfonts = FONS_INIT_FONTS;
+	stash->nfonts = 0;
+
+	// Create texture for the cache.
+	stash->itw = 1.0f/stash->params.width;
+	stash->ith = 1.0f/stash->params.height;
+	stash->texData = (unsigned char*)malloc(stash->params.width * stash->params.height);
+	if (stash->texData == NULL) goto error;
+	memset(stash->texData, 0, stash->params.width * stash->params.height);
+
+	stash->dirtyRect[0] = stash->params.width;
+	stash->dirtyRect[1] = stash->params.height;
+	stash->dirtyRect[2] = 0;
+	stash->dirtyRect[3] = 0;
+
+	// Add white rect at 0,0 for debug drawing.
+	fons__addWhiteRect(stash, 2,2);
+
+	fonsPushState(stash);
+	fonsClearState(stash);
+
+	return stash;
+
+error:
+	fonsDeleteInternal(stash);
+	return NULL;
+}
+
+static FONSstate* fons__getState(FONScontext* stash)
+{
+	return &stash->states[stash->nstates-1];
+}
+
+int fonsAddFallbackFont(FONScontext* stash, int base, int fallback)
+{
+	FONSfont* baseFont = stash->fonts[base];
+	if (baseFont->nfallbacks < FONS_MAX_FALLBACKS) {
+		baseFont->fallbacks[baseFont->nfallbacks++] = fallback;
+		return 1;
+	}
+	return 0;
+}
+
+void fonsResetFallbackFont(FONScontext* stash, int base)
+{
+	int i;
+
+	FONSfont* baseFont = stash->fonts[base];
+	baseFont->nfallbacks = 0;
+	baseFont->nglyphs = 0;
+	for (i = 0; i < FONS_HASH_LUT_SIZE; i++)
+		baseFont->lut[i] = -1;
+}
+
+void fonsSetSize(FONScontext* stash, float size)
+{
+	fons__getState(stash)->size = size;
+}
+
+void fonsSetColor(FONScontext* stash, unsigned int color)
+{
+	fons__getState(stash)->color = color;
+}
+
+void fonsSetSpacing(FONScontext* stash, float spacing)
+{
+	fons__getState(stash)->spacing = spacing;
+}
+
+void fonsSetBlur(FONScontext* stash, float blur)
+{
+	fons__getState(stash)->blur = blur;
+}
+
+void fonsSetAlign(FONScontext* stash, int align)
+{
+	fons__getState(stash)->align = align;
+}
+
+void fonsSetFont(FONScontext* stash, int font)
+{
+	fons__getState(stash)->font = font;
+}
+
+void fonsPushState(FONScontext* stash)
+{
+	if (stash->nstates >= FONS_MAX_STATES) {
+		if (stash->handleError)
+			stash->handleError(stash->errorUptr, FONS_STATES_OVERFLOW, 0);
+		return;
+	}
+	if (stash->nstates > 0)
+		memcpy(&stash->states[stash->nstates], &stash->states[stash->nstates-1], sizeof(FONSstate));
+	stash->nstates++;
+}
+
+void fonsPopState(FONScontext* stash)
+{
+	if (stash->nstates <= 1) {
+		if (stash->handleError)
+			stash->handleError(stash->errorUptr, FONS_STATES_UNDERFLOW, 0);
+		return;
+	}
+	stash->nstates--;
+}
+
+void fonsClearState(FONScontext* stash)
+{
+	FONSstate* state = fons__getState(stash);
+	state->size = 12.0f;
+	state->color = 0xffffffff;
+	state->font = 0;
+	state->blur = 0;
+	state->spacing = 0;
+	state->align = FONS_ALIGN_LEFT | FONS_ALIGN_BASELINE;
+}
+
+static void fons__freeFont(FONSfont* font)
+{
+	if (font == NULL) return;
+	if (font->glyphs) free(font->glyphs);
+	if (font->freeData && font->data) free(font->data);
+	free(font);
+}
+
+static int fons__allocFont(FONScontext* stash)
+{
+	FONSfont* font = NULL;
+	if (stash->nfonts+1 > stash->cfonts) {
+		stash->cfonts = stash->cfonts == 0 ? 8 : stash->cfonts * 2;
+		stash->fonts = (FONSfont**)realloc(stash->fonts, sizeof(FONSfont*) * stash->cfonts);
+		if (stash->fonts == NULL)
+			return -1;
+	}
+	font = (FONSfont*)malloc(sizeof(FONSfont));
+	if (font == NULL) goto error;
+	memset(font, 0, sizeof(FONSfont));
+
+	font->glyphs = (FONSglyph*)malloc(sizeof(FONSglyph) * FONS_INIT_GLYPHS);
+	if (font->glyphs == NULL) goto error;
+	font->cglyphs = FONS_INIT_GLYPHS;
+	font->nglyphs = 0;
+
+	stash->fonts[stash->nfonts++] = font;
+	return stash->nfonts-1;
+
+error:
+	fons__freeFont(font);
+
+	return FONS_INVALID;
+}
+
+int fonsAddFont(FONScontext* stash, const char* name, const char* path, int fontIndex)
+{
+	FILE* fp = 0;
+	int dataSize = 0;
+	size_t readed;
+	unsigned char* data = NULL;
+
+	// Read in the font data.
+	fp = fopen(path, "rb");
+	if (fp == NULL) goto error;
+	fseek(fp,0,SEEK_END);
+	dataSize = (int)ftell(fp);
+	fseek(fp,0,SEEK_SET);
+	data = (unsigned char*)malloc(dataSize);
+	if (data == NULL) goto error;
+	readed = fread(data, 1, dataSize, fp);
+	fclose(fp);
+	fp = 0;
+	if (readed != (size_t)dataSize) goto error;
+
+	return fonsAddFontMem(stash, name, data, dataSize, 1, fontIndex);
+
+error:
+	if (data) free(data);
+	if (fp) fclose(fp);
+	return FONS_INVALID;
+}
+
+int fonsAddFontMem(FONScontext* stash, const char* name, unsigned char* data, int dataSize, int freeData, int fontIndex)
+{
+	int i, ascent, descent, fh, lineGap;
+	FONSfont* font;
+
+	int idx = fons__allocFont(stash);
+	if (idx == FONS_INVALID)
+		return FONS_INVALID;
+
+	font = stash->fonts[idx];
+
+	strncpy(font->name, name, sizeof(font->name));
+	font->name[sizeof(font->name)-1] = '\0';
+
+	// Init hash lookup.
+	for (i = 0; i < FONS_HASH_LUT_SIZE; ++i)
+		font->lut[i] = -1;
+
+	// Read in the font data.
+	font->dataSize = dataSize;
+	font->data = data;
+	font->freeData = (unsigned char)freeData;
+
+	// Init font
+	stash->nscratch = 0;
+	if (!fons__tt_loadFont(stash, &font->font, data, dataSize, fontIndex)) goto error;
+
+	// Store normalized line height. The real line height is got
+	// by multiplying the lineh by font size.
+	fons__tt_getFontVMetrics( &font->font, &ascent, &descent, &lineGap);
+	ascent += lineGap;
+	fh = ascent - descent;
+	font->ascender = (float)ascent / (float)fh;
+	font->descender = (float)descent / (float)fh;
+	font->lineh = font->ascender - font->descender;
+
+	return idx;
+
+error:
+	fons__freeFont(font);
+	stash->nfonts--;
+	return FONS_INVALID;
+}
+
+int fonsGetFontByName(FONScontext* s, const char* name)
+{
+	int i;
+	for (i = 0; i < s->nfonts; i++) {
+		if (strcmp(s->fonts[i]->name, name) == 0)
+			return i;
+	}
+	return FONS_INVALID;
+}
+
+
+static FONSglyph* fons__allocGlyph(FONSfont* font)
+{
+	if (font->nglyphs+1 > font->cglyphs) {
+		font->cglyphs = font->cglyphs == 0 ? 8 : font->cglyphs * 2;
+		font->glyphs = (FONSglyph*)realloc(font->glyphs, sizeof(FONSglyph) * font->cglyphs);
+		if (font->glyphs == NULL) return NULL;
+	}
+	font->nglyphs++;
+	return &font->glyphs[font->nglyphs-1];
+}
+
+
+// Based on Exponential blur, Jani Huhtanen, 2006
+
+#define APREC 16
+#define ZPREC 7
+
+static void fons__blurCols(unsigned char* dst, int w, int h, int dstStride, int alpha)
+{
+	int x, y;
+	for (y = 0; y < h; y++) {
+		int z = 0; // force zero border
+		for (x = 1; x < w; x++) {
+			z += (alpha * (((int)(dst[x]) << ZPREC) - z)) >> APREC;
+			dst[x] = (unsigned char)(z >> ZPREC);
+		}
+		dst[w-1] = 0; // force zero border
+		z = 0;
+		for (x = w-2; x >= 0; x--) {
+			z += (alpha * (((int)(dst[x]) << ZPREC) - z)) >> APREC;
+			dst[x] = (unsigned char)(z >> ZPREC);
+		}
+		dst[0] = 0; // force zero border
+		dst += dstStride;
+	}
+}
+
+static void fons__blurRows(unsigned char* dst, int w, int h, int dstStride, int alpha)
+{
+	int x, y;
+	for (x = 0; x < w; x++) {
+		int z = 0; // force zero border
+		for (y = dstStride; y < h*dstStride; y += dstStride) {
+			z += (alpha * (((int)(dst[y]) << ZPREC) - z)) >> APREC;
+			dst[y] = (unsigned char)(z >> ZPREC);
+		}
+		dst[(h-1)*dstStride] = 0; // force zero border
+		z = 0;
+		for (y = (h-2)*dstStride; y >= 0; y -= dstStride) {
+			z += (alpha * (((int)(dst[y]) << ZPREC) - z)) >> APREC;
+			dst[y] = (unsigned char)(z >> ZPREC);
+		}
+		dst[0] = 0; // force zero border
+		dst++;
+	}
+}
+
+
+static void fons__blur(FONScontext* stash, unsigned char* dst, int w, int h, int dstStride, int blur)
+{
+	int alpha;
+	float sigma;
+	(void)stash;
+
+	if (blur < 1)
+		return;
+	// Calculate the alpha such that 90% of the kernel is within the radius. (Kernel extends to infinity)
+	sigma = (float)blur * 0.57735f; // 1 / sqrt(3)
+	alpha = (int)((1<<APREC) * (1.0f - expf(-2.3f / (sigma+1.0f))));
+	fons__blurRows(dst, w, h, dstStride, alpha);
+	fons__blurCols(dst, w, h, dstStride, alpha);
+	fons__blurRows(dst, w, h, dstStride, alpha);
+	fons__blurCols(dst, w, h, dstStride, alpha);
+//	fons__blurrows(dst, w, h, dstStride, alpha);
+//	fons__blurcols(dst, w, h, dstStride, alpha);
+}
+
+static FONSglyph* fons__getGlyph(FONScontext* stash, FONSfont* font, unsigned int codepoint,
+								 short isize, short iblur, int bitmapOption)
+{
+	int i, g, advance, lsb, x0, y0, x1, y1, gw, gh, gx, gy, x, y;
+	float scale;
+	FONSglyph* glyph = NULL;
+	unsigned int h;
+	float size = isize/10.0f;
+	int pad, added;
+	unsigned char* bdst;
+	unsigned char* dst;
+	FONSfont* renderFont = font;
+
+	if (isize < 2) return NULL;
+	if (iblur > 20) iblur = 20;
+	pad = iblur+2;
+
+	// Reset allocator.
+	stash->nscratch = 0;
+
+	// Find code point and size.
+	h = fons__hashint(codepoint) & (FONS_HASH_LUT_SIZE-1);
+	i = font->lut[h];
+	while (i != -1) {
+		if (font->glyphs[i].codepoint == codepoint && font->glyphs[i].size == isize && font->glyphs[i].blur == iblur) {
+			glyph = &font->glyphs[i];
+			if (bitmapOption == FONS_GLYPH_BITMAP_OPTIONAL || (glyph->x0 >= 0 && glyph->y0 >= 0)) {
+			  return glyph;
+			}
+			// At this point, glyph exists but the bitmap data is not yet created.
+			break;
+		}
+		i = font->glyphs[i].next;
+	}
+
+	// Create a new glyph or rasterize bitmap data for a cached glyph.
+	g = fons__tt_getGlyphIndex(&font->font, codepoint);
+	// Try to find the glyph in fallback fonts.
+	if (g == 0) {
+		for (i = 0; i < font->nfallbacks; ++i) {
+			FONSfont* fallbackFont = stash->fonts[font->fallbacks[i]];
+			int fallbackIndex = fons__tt_getGlyphIndex(&fallbackFont->font, codepoint);
+			if (fallbackIndex != 0) {
+				g = fallbackIndex;
+				renderFont = fallbackFont;
+				break;
+			}
+		}
+		// It is possible that we did not find a fallback glyph.
+		// In that case the glyph index 'g' is 0, and we'll proceed below and cache empty glyph.
+	}
+	scale = fons__tt_getPixelHeightScale(&renderFont->font, size);
+	fons__tt_buildGlyphBitmap(&renderFont->font, g, size, scale, &advance, &lsb, &x0, &y0, &x1, &y1);
+	gw = x1-x0 + pad*2;
+	gh = y1-y0 + pad*2;
+
+	// Determines the spot to draw glyph in the atlas.
+	if (bitmapOption == FONS_GLYPH_BITMAP_REQUIRED) {
+		// Find free spot for the rect in the atlas
+		added = fons__atlasAddRect(stash->atlas, gw, gh, &gx, &gy);
+		if (added == 0 && stash->handleError != NULL) {
+			// Atlas is full, let the user to resize the atlas (or not), and try again.
+			stash->handleError(stash->errorUptr, FONS_ATLAS_FULL, 0);
+			added = fons__atlasAddRect(stash->atlas, gw, gh, &gx, &gy);
+		}
+		if (added == 0) return NULL;
+	} else {
+		// Negative coordinate indicates there is no bitmap data created.
+		gx = -1;
+		gy = -1;
+	}
+
+	// Init glyph.
+	if (glyph == NULL) {
+		glyph = fons__allocGlyph(font);
+		glyph->codepoint = codepoint;
+		glyph->size = isize;
+		glyph->blur = iblur;
+		glyph->next = 0;
+
+		// Insert char to hash lookup.
+		glyph->next = font->lut[h];
+		font->lut[h] = font->nglyphs-1;
+	}
+	glyph->index = g;
+	glyph->x0 = (short)gx;
+	glyph->y0 = (short)gy;
+	glyph->x1 = (short)(glyph->x0+gw);
+	glyph->y1 = (short)(glyph->y0+gh);
+	glyph->xadv = (short)(scale * advance * 10.0f);
+	glyph->xoff = (short)(x0 - pad);
+	glyph->yoff = (short)(y0 - pad);
+
+	if (bitmapOption == FONS_GLYPH_BITMAP_OPTIONAL) {
+		return glyph;
+	}
+
+	// Rasterize
+	dst = &stash->texData[(glyph->x0+pad) + (glyph->y0+pad) * stash->params.width];
+	fons__tt_renderGlyphBitmap(&renderFont->font, dst, gw-pad*2,gh-pad*2, stash->params.width, scale, scale, g);
+
+	// Make sure there is one pixel empty border.
+	dst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width];
+	for (y = 0; y < gh; y++) {
+		dst[y*stash->params.width] = 0;
+		dst[gw-1 + y*stash->params.width] = 0;
+	}
+	for (x = 0; x < gw; x++) {
+		dst[x] = 0;
+		dst[x + (gh-1)*stash->params.width] = 0;
+	}
+
+	// Debug code to color the glyph background
+/*	unsigned char* fdst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width];
+	for (y = 0; y < gh; y++) {
+		for (x = 0; x < gw; x++) {
+			int a = (int)fdst[x+y*stash->params.width] + 20;
+			if (a > 255) a = 255;
+			fdst[x+y*stash->params.width] = a;
+		}
+	}*/
+
+	// Blur
+	if (iblur > 0) {
+		stash->nscratch = 0;
+		bdst = &stash->texData[glyph->x0 + glyph->y0 * stash->params.width];
+		fons__blur(stash, bdst, gw, gh, stash->params.width, iblur);
+	}
+
+	stash->dirtyRect[0] = fons__mini(stash->dirtyRect[0], glyph->x0);
+	stash->dirtyRect[1] = fons__mini(stash->dirtyRect[1], glyph->y0);
+	stash->dirtyRect[2] = fons__maxi(stash->dirtyRect[2], glyph->x1);
+	stash->dirtyRect[3] = fons__maxi(stash->dirtyRect[3], glyph->y1);
+
+	return glyph;
+}
+
+static void fons__getQuad(FONScontext* stash, FONSfont* font,
+						   int prevGlyphIndex, FONSglyph* glyph,
+						   float scale, float spacing, float* x, float* y, FONSquad* q)
+{
+	float rx,ry,xoff,yoff,x0,y0,x1,y1;
+
+	if (prevGlyphIndex != -1) {
+		float adv = fons__tt_getGlyphKernAdvance(&font->font, prevGlyphIndex, glyph->index) * scale;
+		*x += (int)(adv + spacing + 0.5f);
+	}
+
+	// Each glyph has 2px border to allow good interpolation,
+	// one pixel to prevent leaking, and one to allow good interpolation for rendering.
+	// Inset the texture region by one pixel for correct interpolation.
+	xoff = (short)(glyph->xoff+1);
+	yoff = (short)(glyph->yoff+1);
+	x0 = (float)(glyph->x0+1);
+	y0 = (float)(glyph->y0+1);
+	x1 = (float)(glyph->x1-1);
+	y1 = (float)(glyph->y1-1);
+
+	if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+		rx = floorf(*x + xoff);
+		ry = floorf(*y + yoff);
+
+		q->x0 = rx;
+		q->y0 = ry;
+		q->x1 = rx + x1 - x0;
+		q->y1 = ry + y1 - y0;
+
+		q->s0 = x0 * stash->itw;
+		q->t0 = y0 * stash->ith;
+		q->s1 = x1 * stash->itw;
+		q->t1 = y1 * stash->ith;
+	} else {
+		rx = floorf(*x + xoff);
+		ry = floorf(*y - yoff);
+
+		q->x0 = rx;
+		q->y0 = ry;
+		q->x1 = rx + x1 - x0;
+		q->y1 = ry - y1 + y0;
+
+		q->s0 = x0 * stash->itw;
+		q->t0 = y0 * stash->ith;
+		q->s1 = x1 * stash->itw;
+		q->t1 = y1 * stash->ith;
+	}
+
+	*x += (int)(glyph->xadv / 10.0f + 0.5f);
+}
+
+static void fons__flush(FONScontext* stash)
+{
+	// Flush texture
+	if (stash->dirtyRect[0] < stash->dirtyRect[2] && stash->dirtyRect[1] < stash->dirtyRect[3]) {
+		if (stash->params.renderUpdate != NULL)
+			stash->params.renderUpdate(stash->params.userPtr, stash->dirtyRect, stash->texData);
+		// Reset dirty rect
+		stash->dirtyRect[0] = stash->params.width;
+		stash->dirtyRect[1] = stash->params.height;
+		stash->dirtyRect[2] = 0;
+		stash->dirtyRect[3] = 0;
+	}
+
+	// Flush triangles
+	if (stash->nverts > 0) {
+		if (stash->params.renderDraw != NULL)
+			stash->params.renderDraw(stash->params.userPtr, stash->verts, stash->tcoords, stash->colors, stash->nverts);
+		stash->nverts = 0;
+	}
+}
+
+static __inline void fons__vertex(FONScontext* stash, float x, float y, float s, float t, unsigned int c)
+{
+	stash->verts[stash->nverts*2+0] = x;
+	stash->verts[stash->nverts*2+1] = y;
+	stash->tcoords[stash->nverts*2+0] = s;
+	stash->tcoords[stash->nverts*2+1] = t;
+	stash->colors[stash->nverts] = c;
+	stash->nverts++;
+}
+
+static float fons__getVertAlign(FONScontext* stash, FONSfont* font, int align, short isize)
+{
+	if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+		if (align & FONS_ALIGN_TOP) {
+			return font->ascender * (float)isize/10.0f;
+		} else if (align & FONS_ALIGN_MIDDLE) {
+			return (font->ascender + font->descender) / 2.0f * (float)isize/10.0f;
+		} else if (align & FONS_ALIGN_BASELINE) {
+			return 0.0f;
+		} else if (align & FONS_ALIGN_BOTTOM) {
+			return font->descender * (float)isize/10.0f;
+		}
+	} else {
+		if (align & FONS_ALIGN_TOP) {
+			return -font->ascender * (float)isize/10.0f;
+		} else if (align & FONS_ALIGN_MIDDLE) {
+			return -(font->ascender + font->descender) / 2.0f * (float)isize/10.0f;
+		} else if (align & FONS_ALIGN_BASELINE) {
+			return 0.0f;
+		} else if (align & FONS_ALIGN_BOTTOM) {
+			return -font->descender * (float)isize/10.0f;
+		}
+	}
+	return 0.0;
+}
+
+float fonsDrawText(FONScontext* stash,
+				   float x, float y,
+				   const char* str, const char* end)
+{
+	FONSstate* state = fons__getState(stash);
+	unsigned int codepoint;
+	unsigned int utf8state = 0;
+	FONSglyph* glyph = NULL;
+	FONSquad q;
+	int prevGlyphIndex = -1;
+	short isize = (short)(state->size*10.0f);
+	short iblur = (short)state->blur;
+	float scale;
+	FONSfont* font;
+	float width;
+
+	if (stash == NULL) return x;
+	if (state->font < 0 || state->font >= stash->nfonts) return x;
+	font = stash->fonts[state->font];
+	if (font->data == NULL) return x;
+
+	scale = fons__tt_getPixelHeightScale(&font->font, (float)isize/10.0f);
+
+	if (end == NULL)
+		end = str + strlen(str);
+
+	// Align horizontally
+	if (state->align & FONS_ALIGN_LEFT) {
+		// empty
+	} else if (state->align & FONS_ALIGN_RIGHT) {
+		width = fonsTextBounds(stash, x,y, str, end, NULL);
+		x -= width;
+	} else if (state->align & FONS_ALIGN_CENTER) {
+		width = fonsTextBounds(stash, x,y, str, end, NULL);
+		x -= width * 0.5f;
+	}
+	// Align vertically.
+	y += fons__getVertAlign(stash, font, state->align, isize);
+
+	for (; str != end; ++str) {
+		if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)str))
+			continue;
+		glyph = fons__getGlyph(stash, font, codepoint, isize, iblur, FONS_GLYPH_BITMAP_REQUIRED);
+		if (glyph != NULL) {
+			fons__getQuad(stash, font, prevGlyphIndex, glyph, scale, state->spacing, &x, &y, &q);
+
+			if (stash->nverts+6 > FONS_VERTEX_COUNT)
+				fons__flush(stash);
+
+			fons__vertex(stash, q.x0, q.y0, q.s0, q.t0, state->color);
+			fons__vertex(stash, q.x1, q.y1, q.s1, q.t1, state->color);
+			fons__vertex(stash, q.x1, q.y0, q.s1, q.t0, state->color);
+
+			fons__vertex(stash, q.x0, q.y0, q.s0, q.t0, state->color);
+			fons__vertex(stash, q.x0, q.y1, q.s0, q.t1, state->color);
+			fons__vertex(stash, q.x1, q.y1, q.s1, q.t1, state->color);
+		}
+		prevGlyphIndex = glyph != NULL ? glyph->index : -1;
+	}
+	fons__flush(stash);
+
+	return x;
+}
+
+int fonsTextIterInit(FONScontext* stash, FONStextIter* iter,
+					 float x, float y, const char* str, const char* end, int bitmapOption)
+{
+	FONSstate* state = fons__getState(stash);
+	float width;
+
+	memset(iter, 0, sizeof(*iter));
+
+	if (stash == NULL) return 0;
+	if (state->font < 0 || state->font >= stash->nfonts) return 0;
+	iter->font = stash->fonts[state->font];
+	if (iter->font->data == NULL) return 0;
+
+	iter->isize = (short)(state->size*10.0f);
+	iter->iblur = (short)state->blur;
+	iter->scale = fons__tt_getPixelHeightScale(&iter->font->font, (float)iter->isize/10.0f);
+
+	// Align horizontally
+	if (state->align & FONS_ALIGN_LEFT) {
+		// empty
+	} else if (state->align & FONS_ALIGN_RIGHT) {
+		width = fonsTextBounds(stash, x,y, str, end, NULL);
+		x -= width;
+	} else if (state->align & FONS_ALIGN_CENTER) {
+		width = fonsTextBounds(stash, x,y, str, end, NULL);
+		x -= width * 0.5f;
+	}
+	// Align vertically.
+	y += fons__getVertAlign(stash, iter->font, state->align, iter->isize);
+
+	if (end == NULL)
+		end = str + strlen(str);
+
+	iter->x = iter->nextx = x;
+	iter->y = iter->nexty = y;
+	iter->spacing = state->spacing;
+	iter->str = str;
+	iter->next = str;
+	iter->end = end;
+	iter->codepoint = 0;
+	iter->prevGlyphIndex = -1;
+	iter->bitmapOption = bitmapOption;
+
+	return 1;
+}
+
+int fonsTextIterNext(FONScontext* stash, FONStextIter* iter, FONSquad* quad)
+{
+	FONSglyph* glyph = NULL;
+	const char* str = iter->next;
+	iter->str = iter->next;
+
+	if (str == iter->end)
+		return 0;
+
+	for (; str != iter->end; str++) {
+		if (fons__decutf8(&iter->utf8state, &iter->codepoint, *(const unsigned char*)str))
+			continue;
+		str++;
+		// Get glyph and quad
+		iter->x = iter->nextx;
+		iter->y = iter->nexty;
+		glyph = fons__getGlyph(stash, iter->font, iter->codepoint, iter->isize, iter->iblur, iter->bitmapOption);
+		// If the iterator was initialized with FONS_GLYPH_BITMAP_OPTIONAL, then the UV coordinates of the quad will be invalid.
+		if (glyph != NULL)
+			fons__getQuad(stash, iter->font, iter->prevGlyphIndex, glyph, iter->scale, iter->spacing, &iter->nextx, &iter->nexty, quad);
+		iter->prevGlyphIndex = glyph != NULL ? glyph->index : -1;
+		break;
+	}
+	iter->next = str;
+
+	return 1;
+}
+
+void fonsDrawDebug(FONScontext* stash, float x, float y)
+{
+	int i;
+	int w = stash->params.width;
+	int h = stash->params.height;
+	float u = w == 0 ? 0 : (1.0f / w);
+	float v = h == 0 ? 0 : (1.0f / h);
+
+	if (stash->nverts+6+6 > FONS_VERTEX_COUNT)
+		fons__flush(stash);
+
+	// Draw background
+	fons__vertex(stash, x+0, y+0, u, v, 0x0fffffff);
+	fons__vertex(stash, x+w, y+h, u, v, 0x0fffffff);
+	fons__vertex(stash, x+w, y+0, u, v, 0x0fffffff);
+
+	fons__vertex(stash, x+0, y+0, u, v, 0x0fffffff);
+	fons__vertex(stash, x+0, y+h, u, v, 0x0fffffff);
+	fons__vertex(stash, x+w, y+h, u, v, 0x0fffffff);
+
+	// Draw texture
+	fons__vertex(stash, x+0, y+0, 0, 0, 0xffffffff);
+	fons__vertex(stash, x+w, y+h, 1, 1, 0xffffffff);
+	fons__vertex(stash, x+w, y+0, 1, 0, 0xffffffff);
+
+	fons__vertex(stash, x+0, y+0, 0, 0, 0xffffffff);
+	fons__vertex(stash, x+0, y+h, 0, 1, 0xffffffff);
+	fons__vertex(stash, x+w, y+h, 1, 1, 0xffffffff);
+
+	// Drawbug draw atlas
+	for (i = 0; i < stash->atlas->nnodes; i++) {
+		FONSatlasNode* n = &stash->atlas->nodes[i];
+
+		if (stash->nverts+6 > FONS_VERTEX_COUNT)
+			fons__flush(stash);
+
+		fons__vertex(stash, x+n->x+0, y+n->y+0, u, v, 0xc00000ff);
+		fons__vertex(stash, x+n->x+n->width, y+n->y+1, u, v, 0xc00000ff);
+		fons__vertex(stash, x+n->x+n->width, y+n->y+0, u, v, 0xc00000ff);
+
+		fons__vertex(stash, x+n->x+0, y+n->y+0, u, v, 0xc00000ff);
+		fons__vertex(stash, x+n->x+0, y+n->y+1, u, v, 0xc00000ff);
+		fons__vertex(stash, x+n->x+n->width, y+n->y+1, u, v, 0xc00000ff);
+	}
+
+	fons__flush(stash);
+}
+
+float fonsTextBounds(FONScontext* stash,
+					 float x, float y,
+					 const char* str, const char* end,
+					 float* bounds)
+{
+	FONSstate* state = fons__getState(stash);
+	unsigned int codepoint;
+	unsigned int utf8state = 0;
+	FONSquad q;
+	FONSglyph* glyph = NULL;
+	int prevGlyphIndex = -1;
+	short isize = (short)(state->size*10.0f);
+	short iblur = (short)state->blur;
+	float scale;
+	FONSfont* font;
+	float startx, advance;
+	float minx, miny, maxx, maxy;
+
+	if (stash == NULL) return 0;
+	if (state->font < 0 || state->font >= stash->nfonts) return 0;
+	font = stash->fonts[state->font];
+	if (font->data == NULL) return 0;
+
+	scale = fons__tt_getPixelHeightScale(&font->font, (float)isize/10.0f);
+
+	// Align vertically.
+	y += fons__getVertAlign(stash, font, state->align, isize);
+
+	minx = maxx = x;
+	miny = maxy = y;
+	startx = x;
+
+	if (end == NULL)
+		end = str + strlen(str);
+
+	for (; str != end; ++str) {
+		if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)str))
+			continue;
+		glyph = fons__getGlyph(stash, font, codepoint, isize, iblur, FONS_GLYPH_BITMAP_OPTIONAL);
+		if (glyph != NULL) {
+			fons__getQuad(stash, font, prevGlyphIndex, glyph, scale, state->spacing, &x, &y, &q);
+			if (q.x0 < minx) minx = q.x0;
+			if (q.x1 > maxx) maxx = q.x1;
+			if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+				if (q.y0 < miny) miny = q.y0;
+				if (q.y1 > maxy) maxy = q.y1;
+			} else {
+				if (q.y1 < miny) miny = q.y1;
+				if (q.y0 > maxy) maxy = q.y0;
+			}
+		}
+		prevGlyphIndex = glyph != NULL ? glyph->index : -1;
+	}
+
+	advance = x - startx;
+
+	// Align horizontally
+	if (state->align & FONS_ALIGN_LEFT) {
+		// empty
+	} else if (state->align & FONS_ALIGN_RIGHT) {
+		minx -= advance;
+		maxx -= advance;
+	} else if (state->align & FONS_ALIGN_CENTER) {
+		minx -= advance * 0.5f;
+		maxx -= advance * 0.5f;
+	}
+
+	if (bounds) {
+		bounds[0] = minx;
+		bounds[1] = miny;
+		bounds[2] = maxx;
+		bounds[3] = maxy;
+	}
+
+	return advance;
+}
+
+void fonsVertMetrics(FONScontext* stash,
+					 float* ascender, float* descender, float* lineh)
+{
+	FONSfont* font;
+	FONSstate* state = fons__getState(stash);
+	short isize;
+
+	if (stash == NULL) return;
+	if (state->font < 0 || state->font >= stash->nfonts) return;
+	font = stash->fonts[state->font];
+	isize = (short)(state->size*10.0f);
+	if (font->data == NULL) return;
+
+	if (ascender)
+		*ascender = font->ascender*isize/10.0f;
+	if (descender)
+		*descender = font->descender*isize/10.0f;
+	if (lineh)
+		*lineh = font->lineh*isize/10.0f;
+}
+
+void fonsLineBounds(FONScontext* stash, float y, float* miny, float* maxy)
+{
+	FONSfont* font;
+	FONSstate* state = fons__getState(stash);
+	short isize;
+
+	if (stash == NULL) return;
+	if (state->font < 0 || state->font >= stash->nfonts) return;
+	font = stash->fonts[state->font];
+	isize = (short)(state->size*10.0f);
+	if (font->data == NULL) return;
+
+	y += fons__getVertAlign(stash, font, state->align, isize);
+
+	if (stash->params.flags & FONS_ZERO_TOPLEFT) {
+		*miny = y - font->ascender * (float)isize/10.0f;
+		*maxy = *miny + font->lineh*isize/10.0f;
+	} else {
+		*maxy = y + font->descender * (float)isize/10.0f;
+		*miny = *maxy - font->lineh*isize/10.0f;
+	}
+}
+
+const unsigned char* fonsGetTextureData(FONScontext* stash, int* width, int* height)
+{
+	if (width != NULL)
+		*width = stash->params.width;
+	if (height != NULL)
+		*height = stash->params.height;
+	return stash->texData;
+}
+
+int fonsValidateTexture(FONScontext* stash, int* dirty)
+{
+	if (stash->dirtyRect[0] < stash->dirtyRect[2] && stash->dirtyRect[1] < stash->dirtyRect[3]) {
+		dirty[0] = stash->dirtyRect[0];
+		dirty[1] = stash->dirtyRect[1];
+		dirty[2] = stash->dirtyRect[2];
+		dirty[3] = stash->dirtyRect[3];
+		// Reset dirty rect
+		stash->dirtyRect[0] = stash->params.width;
+		stash->dirtyRect[1] = stash->params.height;
+		stash->dirtyRect[2] = 0;
+		stash->dirtyRect[3] = 0;
+		return 1;
+	}
+	return 0;
+}
+
+void fonsDeleteInternal(FONScontext* stash)
+{
+	int i;
+	if (stash == NULL) return;
+
+	if (stash->params.renderDelete)
+		stash->params.renderDelete(stash->params.userPtr);
+
+	for (i = 0; i < stash->nfonts; ++i)
+		fons__freeFont(stash->fonts[i]);
+
+	if (stash->atlas) fons__deleteAtlas(stash->atlas);
+	if (stash->fonts) free(stash->fonts);
+	if (stash->texData) free(stash->texData);
+	if (stash->scratch) free(stash->scratch);
+	fons__tt_done(stash);
+	free(stash);
+}
+
+void fonsSetErrorCallback(FONScontext* stash, void (*callback)(void* uptr, int error, int val), void* uptr)
+{
+	if (stash == NULL) return;
+	stash->handleError = callback;
+	stash->errorUptr = uptr;
+}
+
+void fonsGetAtlasSize(FONScontext* stash, int* width, int* height)
+{
+	if (stash == NULL) return;
+	*width = stash->params.width;
+	*height = stash->params.height;
+}
+
+int fonsExpandAtlas(FONScontext* stash, int width, int height)
+{
+	int i, maxy = 0;
+	unsigned char* data = NULL;
+	if (stash == NULL) return 0;
+
+	width = fons__maxi(width, stash->params.width);
+	height = fons__maxi(height, stash->params.height);
+
+	if (width == stash->params.width && height == stash->params.height)
+		return 1;
+
+	// Flush pending glyphs.
+	fons__flush(stash);
+
+	// Create new texture
+	if (stash->params.renderResize != NULL) {
+		if (stash->params.renderResize(stash->params.userPtr, width, height) == 0)
+			return 0;
+	}
+	// Copy old texture data over.
+	data = (unsigned char*)malloc(width * height);
+	if (data == NULL)
+		return 0;
+	for (i = 0; i < stash->params.height; i++) {
+		unsigned char* dst = &data[i*width];
+		unsigned char* src = &stash->texData[i*stash->params.width];
+		memcpy(dst, src, stash->params.width);
+		if (width > stash->params.width)
+			memset(dst+stash->params.width, 0, width - stash->params.width);
+	}
+	if (height > stash->params.height)
+		memset(&data[stash->params.height * width], 0, (height - stash->params.height) * width);
+
+	free(stash->texData);
+	stash->texData = data;
+
+	// Increase atlas size
+	fons__atlasExpand(stash->atlas, width, height);
+
+	// Add existing data as dirty.
+	for (i = 0; i < stash->atlas->nnodes; i++)
+		maxy = fons__maxi(maxy, stash->atlas->nodes[i].y);
+	stash->dirtyRect[0] = 0;
+	stash->dirtyRect[1] = 0;
+	stash->dirtyRect[2] = stash->params.width;
+	stash->dirtyRect[3] = maxy;
+
+	stash->params.width = width;
+	stash->params.height = height;
+	stash->itw = 1.0f/stash->params.width;
+	stash->ith = 1.0f/stash->params.height;
+
+	return 1;
+}
+
+int fonsResetAtlas(FONScontext* stash, int width, int height)
+{
+	int i, j;
+	if (stash == NULL) return 0;
+
+	// Flush pending glyphs.
+	fons__flush(stash);
+
+	// Create new texture
+	if (stash->params.renderResize != NULL) {
+		if (stash->params.renderResize(stash->params.userPtr, width, height) == 0)
+			return 0;
+	}
+
+	// Reset atlas
+	fons__atlasReset(stash->atlas, width, height);
+
+	// Clear texture data.
+	stash->texData = (unsigned char*)realloc(stash->texData, width * height);
+	if (stash->texData == NULL) return 0;
+	memset(stash->texData, 0, width * height);
+
+	// Reset dirty rect
+	stash->dirtyRect[0] = width;
+	stash->dirtyRect[1] = height;
+	stash->dirtyRect[2] = 0;
+	stash->dirtyRect[3] = 0;
+
+	// Reset cached glyphs
+	for (i = 0; i < stash->nfonts; i++) {
+		FONSfont* font = stash->fonts[i];
+		font->nglyphs = 0;
+		for (j = 0; j < FONS_HASH_LUT_SIZE; j++)
+			font->lut[j] = -1;
+	}
+
+	stash->params.width = width;
+	stash->params.height = height;
+	stash->itw = 1.0f/stash->params.width;
+	stash->ith = 1.0f/stash->params.height;
+
+	// Add white rect at 0,0 for debug drawing.
+	fons__addWhiteRect(stash, 2,2);
+
+	return 1;
+}
+
+
+#endif

nanovg/nanovg.c

@@ -0,0 +1,2947 @@
+//
+// Copyright (c) 2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <math.h>
+#include <memory.h>
+
+#include "nanovg.h"
+#define FONTSTASH_IMPLEMENTATION
+#include "fontstash.h"
+
+#ifndef NVG_NO_STB
+#define STB_IMAGE_IMPLEMENTATION
+#include "stb_image.h"
+#endif
+
+#ifdef _MSC_VER
+#pragma warning(disable: 4100)  // unreferenced formal parameter
+#pragma warning(disable: 4127)  // conditional expression is constant
+#pragma warning(disable: 4204)  // nonstandard extension used : non-constant aggregate initializer
+#pragma warning(disable: 4706)  // assignment within conditional expression
+#endif
+
+#define NVG_INIT_FONTIMAGE_SIZE  512
+#define NVG_MAX_FONTIMAGE_SIZE   2048
+#define NVG_MAX_FONTIMAGES       4
+
+#define NVG_INIT_COMMANDS_SIZE 256
+#define NVG_INIT_POINTS_SIZE 128
+#define NVG_INIT_PATHS_SIZE 16
+#define NVG_INIT_VERTS_SIZE 256
+
+#ifndef NVG_MAX_STATES
+#define NVG_MAX_STATES 32
+#endif
+
+#define NVG_KAPPA90 0.5522847493f	// Length proportional to radius of a cubic bezier handle for 90deg arcs.
+
+#define NVG_COUNTOF(arr) (sizeof(arr) / sizeof(0[arr]))
+
+
+enum NVGcommands {
+	NVG_MOVETO = 0,
+	NVG_LINETO = 1,
+	NVG_BEZIERTO = 2,
+	NVG_CLOSE = 3,
+	NVG_WINDING = 4,
+};
+
+enum NVGpointFlags
+{
+	NVG_PT_CORNER = 0x01,
+	NVG_PT_LEFT = 0x02,
+	NVG_PT_BEVEL = 0x04,
+	NVG_PR_INNERBEVEL = 0x08,
+};
+
+struct NVGstate {
+	NVGcompositeOperationState compositeOperation;
+	int shapeAntiAlias;
+	NVGpaint fill;
+	NVGpaint stroke;
+	float strokeWidth;
+	float miterLimit;
+	int lineJoin;
+	int lineCap;
+	float alpha;
+	float xform[6];
+	NVGscissor scissor;
+	float fontSize;
+	float letterSpacing;
+	float lineHeight;
+	float fontBlur;
+	int textAlign;
+	int fontId;
+};
+typedef struct NVGstate NVGstate;
+
+struct NVGpoint {
+	float x,y;
+	float dx, dy;
+	float len;
+	float dmx, dmy;
+	unsigned char flags;
+};
+typedef struct NVGpoint NVGpoint;
+
+struct NVGpathCache {
+	NVGpoint* points;
+	int npoints;
+	int cpoints;
+	NVGpath* paths;
+	int npaths;
+	int cpaths;
+	NVGvertex* verts;
+	int nverts;
+	int cverts;
+	float bounds[4];
+};
+typedef struct NVGpathCache NVGpathCache;
+
+struct NVGcontext {
+	NVGparams params;
+	float* commands;
+	int ccommands;
+	int ncommands;
+	float commandx, commandy;
+	NVGstate states[NVG_MAX_STATES];
+	int nstates;
+	NVGpathCache* cache;
+	float tessTol;
+	float distTol;
+	float fringeWidth;
+	float devicePxRatio;
+	struct FONScontext* fs;
+	int fontImages[NVG_MAX_FONTIMAGES];
+	int fontImageIdx;
+	int drawCallCount;
+	int fillTriCount;
+	int strokeTriCount;
+	int textTriCount;
+};
+
+static float nvg__sqrtf(float a) { return sqrtf(a); }
+static float nvg__modf(float a, float b) { return fmodf(a, b); }
+static float nvg__sinf(float a) { return sinf(a); }
+static float nvg__cosf(float a) { return cosf(a); }
+static float nvg__tanf(float a) { return tanf(a); }
+static float nvg__atan2f(float a,float b) { return atan2f(a, b); }
+static float nvg__acosf(float a) { return acosf(a); }
+
+static int nvg__mini(int a, int b) { return a < b ? a : b; }
+static int nvg__maxi(int a, int b) { return a > b ? a : b; }
+static int nvg__clampi(int a, int mn, int mx) { return a < mn ? mn : (a > mx ? mx : a); }
+static float nvg__minf(float a, float b) { return a < b ? a : b; }
+static float nvg__maxf(float a, float b) { return a > b ? a : b; }
+static float nvg__absf(float a) { return a >= 0.0f ? a : -a; }
+static float nvg__signf(float a) { return a >= 0.0f ? 1.0f : -1.0f; }
+static float nvg__clampf(float a, float mn, float mx) { return a < mn ? mn : (a > mx ? mx : a); }
+static float nvg__cross(float dx0, float dy0, float dx1, float dy1) { return dx1*dy0 - dx0*dy1; }
+
+static float nvg__normalize(float *x, float* y)
+{
+	float d = nvg__sqrtf((*x)*(*x) + (*y)*(*y));
+	if (d > 1e-6f) {
+		float id = 1.0f / d;
+		*x *= id;
+		*y *= id;
+	}
+	return d;
+}
+
+
+static void nvg__deletePathCache(NVGpathCache* c)
+{
+	if (c == NULL) return;
+	if (c->points != NULL) free(c->points);
+	if (c->paths != NULL) free(c->paths);
+	if (c->verts != NULL) free(c->verts);
+	free(c);
+}
+
+static NVGpathCache* nvg__allocPathCache(void)
+{
+	NVGpathCache* c = (NVGpathCache*)malloc(sizeof(NVGpathCache));
+	if (c == NULL) goto error;
+	memset(c, 0, sizeof(NVGpathCache));
+
+	c->points = (NVGpoint*)malloc(sizeof(NVGpoint)*NVG_INIT_POINTS_SIZE);
+	if (!c->points) goto error;
+	c->npoints = 0;
+	c->cpoints = NVG_INIT_POINTS_SIZE;
+
+	c->paths = (NVGpath*)malloc(sizeof(NVGpath)*NVG_INIT_PATHS_SIZE);
+	if (!c->paths) goto error;
+	c->npaths = 0;
+	c->cpaths = NVG_INIT_PATHS_SIZE;
+
+	c->verts = (NVGvertex*)malloc(sizeof(NVGvertex)*NVG_INIT_VERTS_SIZE);
+	if (!c->verts) goto error;
+	c->nverts = 0;
+	c->cverts = NVG_INIT_VERTS_SIZE;
+
+	return c;
+error:
+	nvg__deletePathCache(c);
+	return NULL;
+}
+
+static void nvg__setDevicePixelRatio(NVGcontext* ctx, float ratio)
+{
+	ctx->tessTol = 0.25f / ratio;
+	ctx->distTol = 0.01f / ratio;
+	ctx->fringeWidth = 1.0f / ratio;
+	ctx->devicePxRatio = ratio;
+}
+
+static NVGcompositeOperationState nvg__compositeOperationState(int op)
+{
+	int sfactor, dfactor;
+
+	if (op == NVG_SOURCE_OVER)
+	{
+		sfactor = NVG_ONE;
+		dfactor = NVG_ONE_MINUS_SRC_ALPHA;
+	}
+	else if (op == NVG_SOURCE_IN)
+	{
+		sfactor = NVG_DST_ALPHA;
+		dfactor = NVG_ZERO;
+	}
+	else if (op == NVG_SOURCE_OUT)
+	{
+		sfactor = NVG_ONE_MINUS_DST_ALPHA;
+		dfactor = NVG_ZERO;
+	}
+	else if (op == NVG_ATOP)
+	{
+		sfactor = NVG_DST_ALPHA;
+		dfactor = NVG_ONE_MINUS_SRC_ALPHA;
+	}
+	else if (op == NVG_DESTINATION_OVER)
+	{
+		sfactor = NVG_ONE_MINUS_DST_ALPHA;
+		dfactor = NVG_ONE;
+	}
+	else if (op == NVG_DESTINATION_IN)
+	{
+		sfactor = NVG_ZERO;
+		dfactor = NVG_SRC_ALPHA;
+	}
+	else if (op == NVG_DESTINATION_OUT)
+	{
+		sfactor = NVG_ZERO;
+		dfactor = NVG_ONE_MINUS_SRC_ALPHA;
+	}
+	else if (op == NVG_DESTINATION_ATOP)
+	{
+		sfactor = NVG_ONE_MINUS_DST_ALPHA;
+		dfactor = NVG_SRC_ALPHA;
+	}
+	else if (op == NVG_LIGHTER)
+	{
+		sfactor = NVG_ONE;
+		dfactor = NVG_ONE;
+	}
+	else if (op == NVG_COPY)
+	{
+		sfactor = NVG_ONE;
+		dfactor = NVG_ZERO;
+	}
+	else if (op == NVG_XOR)
+	{
+		sfactor = NVG_ONE_MINUS_DST_ALPHA;
+		dfactor = NVG_ONE_MINUS_SRC_ALPHA;
+	}
+	else
+	{
+		sfactor = NVG_ONE;
+		dfactor = NVG_ZERO;
+	}
+
+	NVGcompositeOperationState state;
+	state.srcRGB = sfactor;
+	state.dstRGB = dfactor;
+	state.srcAlpha = sfactor;
+	state.dstAlpha = dfactor;
+	return state;
+}
+
+static NVGstate* nvg__getState(NVGcontext* ctx)
+{
+	return &ctx->states[ctx->nstates-1];
+}
+
+NVGcontext* nvgCreateInternal(NVGparams* params)
+{
+	FONSparams fontParams;
+	NVGcontext* ctx = (NVGcontext*)malloc(sizeof(NVGcontext));
+	int i;
+	if (ctx == NULL) goto error;
+	memset(ctx, 0, sizeof(NVGcontext));
+
+	ctx->params = *params;
+	for (i = 0; i < NVG_MAX_FONTIMAGES; i++)
+		ctx->fontImages[i] = 0;
+
+	ctx->commands = (float*)malloc(sizeof(float)*NVG_INIT_COMMANDS_SIZE);
+	if (!ctx->commands) goto error;
+	ctx->ncommands = 0;
+	ctx->ccommands = NVG_INIT_COMMANDS_SIZE;
+
+	ctx->cache = nvg__allocPathCache();
+	if (ctx->cache == NULL) goto error;
+
+	nvgSave(ctx);
+	nvgReset(ctx);
+
+	nvg__setDevicePixelRatio(ctx, 1.0f);
+
+	if (ctx->params.renderCreate(ctx->params.userPtr) == 0) goto error;
+
+	// Init font rendering
+	memset(&fontParams, 0, sizeof(fontParams));
+	fontParams.width = NVG_INIT_FONTIMAGE_SIZE;
+	fontParams.height = NVG_INIT_FONTIMAGE_SIZE;
+	fontParams.flags = FONS_ZERO_TOPLEFT;
+	fontParams.renderCreate = NULL;
+	fontParams.renderUpdate = NULL;
+	fontParams.renderDraw = NULL;
+	fontParams.renderDelete = NULL;
+	fontParams.userPtr = NULL;
+	ctx->fs = fonsCreateInternal(&fontParams);
+	if (ctx->fs == NULL) goto error;
+
+	// Create font texture
+	ctx->fontImages[0] = ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_ALPHA, fontParams.width, fontParams.height, 0, NULL);
+	if (ctx->fontImages[0] == 0) goto error;
+	ctx->fontImageIdx = 0;
+
+	return ctx;
+
+error:
+	nvgDeleteInternal(ctx);
+	return 0;
+}
+
+NVGparams* nvgInternalParams(NVGcontext* ctx)
+{
+    return &ctx->params;
+}
+
+void nvgDeleteInternal(NVGcontext* ctx)
+{
+	int i;
+	if (ctx == NULL) return;
+	if (ctx->commands != NULL) free(ctx->commands);
+	if (ctx->cache != NULL) nvg__deletePathCache(ctx->cache);
+
+	if (ctx->fs)
+		fonsDeleteInternal(ctx->fs);
+
+	for (i = 0; i < NVG_MAX_FONTIMAGES; i++) {
+		if (ctx->fontImages[i] != 0) {
+			nvgDeleteImage(ctx, ctx->fontImages[i]);
+			ctx->fontImages[i] = 0;
+		}
+	}
+
+	if (ctx->params.renderDelete != NULL)
+		ctx->params.renderDelete(ctx->params.userPtr);
+
+	free(ctx);
+}
+
+void nvgBeginFrame(NVGcontext* ctx, float windowWidth, float windowHeight, float devicePixelRatio)
+{
+/*	printf("Tris: draws:%d  fill:%d  stroke:%d  text:%d  TOT:%d\n",
+		ctx->drawCallCount, ctx->fillTriCount, ctx->strokeTriCount, ctx->textTriCount,
+		ctx->fillTriCount+ctx->strokeTriCount+ctx->textTriCount);*/
+
+	ctx->nstates = 0;
+	nvgSave(ctx);
+	nvgReset(ctx);
+
+	nvg__setDevicePixelRatio(ctx, devicePixelRatio);
+
+	ctx->params.renderViewport(ctx->params.userPtr, windowWidth, windowHeight, devicePixelRatio);
+
+	ctx->drawCallCount = 0;
+	ctx->fillTriCount = 0;
+	ctx->strokeTriCount = 0;
+	ctx->textTriCount = 0;
+}
+
+void nvgCancelFrame(NVGcontext* ctx)
+{
+	ctx->params.renderCancel(ctx->params.userPtr);
+}
+
+void nvgEndFrame(NVGcontext* ctx)
+{
+	ctx->params.renderFlush(ctx->params.userPtr);
+	if (ctx->fontImageIdx != 0) {
+		int fontImage = ctx->fontImages[ctx->fontImageIdx];
+		ctx->fontImages[ctx->fontImageIdx] = 0;
+		int i, j, iw, ih;
+		// delete images that smaller than current one
+		if (fontImage == 0)
+			return;
+		nvgImageSize(ctx, fontImage, &iw, &ih);
+		for (i = j = 0; i < ctx->fontImageIdx; i++) {
+			if (ctx->fontImages[i] != 0) {
+				int nw, nh;
+				int image = ctx->fontImages[i];
+				ctx->fontImages[i] = 0;
+				nvgImageSize(ctx, image, &nw, &nh);
+				if (nw < iw || nh < ih)
+					nvgDeleteImage(ctx, image);
+				else
+					ctx->fontImages[j++] = image;
+			}
+		}
+		// make current font image to first
+		ctx->fontImages[j] = ctx->fontImages[0];
+		ctx->fontImages[0] = fontImage;
+		ctx->fontImageIdx = 0;
+	}
+}
+
+NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b)
+{
+	return nvgRGBA(r,g,b,255);
+}
+
+NVGcolor nvgRGBf(float r, float g, float b)
+{
+	return nvgRGBAf(r,g,b,1.0f);
+}
+
+NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a)
+{
+	NVGcolor color;
+	// Use longer initialization to suppress warning.
+	color.r = r / 255.0f;
+	color.g = g / 255.0f;
+	color.b = b / 255.0f;
+	color.a = a / 255.0f;
+	return color;
+}
+
+NVGcolor nvgRGBAf(float r, float g, float b, float a)
+{
+	NVGcolor color;
+	// Use longer initialization to suppress warning.
+	color.r = r;
+	color.g = g;
+	color.b = b;
+	color.a = a;
+	return color;
+}
+
+NVGcolor nvgTransRGBA(NVGcolor c, unsigned char a)
+{
+	c.a = a / 255.0f;
+	return c;
+}
+
+NVGcolor nvgTransRGBAf(NVGcolor c, float a)
+{
+	c.a = a;
+	return c;
+}
+
+NVGcolor nvgLerpRGBA(NVGcolor c0, NVGcolor c1, float u)
+{
+	int i;
+	float oneminu;
+	NVGcolor cint = {{{0}}};
+
+	u = nvg__clampf(u, 0.0f, 1.0f);
+	oneminu = 1.0f - u;
+	for( i = 0; i <4; i++ )
+	{
+		cint.rgba[i] = c0.rgba[i] * oneminu + c1.rgba[i] * u;
+	}
+
+	return cint;
+}
+
+NVGcolor nvgHSL(float h, float s, float l)
+{
+	return nvgHSLA(h,s,l,255);
+}
+
+static float nvg__hue(float h, float m1, float m2)
+{
+	if (h < 0) h += 1;
+	if (h > 1) h -= 1;
+	if (h < 1.0f/6.0f)
+		return m1 + (m2 - m1) * h * 6.0f;
+	else if (h < 3.0f/6.0f)
+		return m2;
+	else if (h < 4.0f/6.0f)
+		return m1 + (m2 - m1) * (2.0f/3.0f - h) * 6.0f;
+	return m1;
+}
+
+NVGcolor nvgHSLA(float h, float s, float l, unsigned char a)
+{
+	float m1, m2;
+	NVGcolor col;
+	h = nvg__modf(h, 1.0f);
+	if (h < 0.0f) h += 1.0f;
+	s = nvg__clampf(s, 0.0f, 1.0f);
+	l = nvg__clampf(l, 0.0f, 1.0f);
+	m2 = l <= 0.5f ? (l * (1 + s)) : (l + s - l * s);
+	m1 = 2 * l - m2;
+	col.r = nvg__clampf(nvg__hue(h + 1.0f/3.0f, m1, m2), 0.0f, 1.0f);
+	col.g = nvg__clampf(nvg__hue(h, m1, m2), 0.0f, 1.0f);
+	col.b = nvg__clampf(nvg__hue(h - 1.0f/3.0f, m1, m2), 0.0f, 1.0f);
+	col.a = a/255.0f;
+	return col;
+}
+
+void nvgTransformIdentity(float* t)
+{
+	t[0] = 1.0f; t[1] = 0.0f;
+	t[2] = 0.0f; t[3] = 1.0f;
+	t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformTranslate(float* t, float tx, float ty)
+{
+	t[0] = 1.0f; t[1] = 0.0f;
+	t[2] = 0.0f; t[3] = 1.0f;
+	t[4] = tx; t[5] = ty;
+}
+
+void nvgTransformScale(float* t, float sx, float sy)
+{
+	t[0] = sx; t[1] = 0.0f;
+	t[2] = 0.0f; t[3] = sy;
+	t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformRotate(float* t, float a)
+{
+	float cs = nvg__cosf(a), sn = nvg__sinf(a);
+	t[0] = cs; t[1] = sn;
+	t[2] = -sn; t[3] = cs;
+	t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformSkewX(float* t, float a)
+{
+	t[0] = 1.0f; t[1] = 0.0f;
+	t[2] = nvg__tanf(a); t[3] = 1.0f;
+	t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformSkewY(float* t, float a)
+{
+	t[0] = 1.0f; t[1] = nvg__tanf(a);
+	t[2] = 0.0f; t[3] = 1.0f;
+	t[4] = 0.0f; t[5] = 0.0f;
+}
+
+void nvgTransformMultiply(float* t, const float* s)
+{
+	float t0 = t[0] * s[0] + t[1] * s[2];
+	float t2 = t[2] * s[0] + t[3] * s[2];
+	float t4 = t[4] * s[0] + t[5] * s[2] + s[4];
+	t[1] = t[0] * s[1] + t[1] * s[3];
+	t[3] = t[2] * s[1] + t[3] * s[3];
+	t[5] = t[4] * s[1] + t[5] * s[3] + s[5];
+	t[0] = t0;
+	t[2] = t2;
+	t[4] = t4;
+}
+
+void nvgTransformPremultiply(float* t, const float* s)
+{
+	float s2[6];
+	memcpy(s2, s, sizeof(float)*6);
+	nvgTransformMultiply(s2, t);
+	memcpy(t, s2, sizeof(float)*6);
+}
+
+int nvgTransformInverse(float* inv, const float* t)
+{
+	double invdet, det = (double)t[0] * t[3] - (double)t[2] * t[1];
+	if (det > -1e-6 && det < 1e-6) {
+		nvgTransformIdentity(inv);
+		return 0;
+	}
+	invdet = 1.0 / det;
+	inv[0] = (float)(t[3] * invdet);
+	inv[2] = (float)(-t[2] * invdet);
+	inv[4] = (float)(((double)t[2] * t[5] - (double)t[3] * t[4]) * invdet);
+	inv[1] = (float)(-t[1] * invdet);
+	inv[3] = (float)(t[0] * invdet);
+	inv[5] = (float)(((double)t[1] * t[4] - (double)t[0] * t[5]) * invdet);
+	return 1;
+}
+
+void nvgTransformPoint(float* dx, float* dy, const float* t, float sx, float sy)
+{
+	*dx = sx*t[0] + sy*t[2] + t[4];
+	*dy = sx*t[1] + sy*t[3] + t[5];
+}
+
+float nvgDegToRad(float deg)
+{
+	return deg / 180.0f * NVG_PI;
+}
+
+float nvgRadToDeg(float rad)
+{
+	return rad / NVG_PI * 180.0f;
+}
+
+static void nvg__setPaintColor(NVGpaint* p, NVGcolor color)
+{
+	memset(p, 0, sizeof(*p));
+	nvgTransformIdentity(p->xform);
+	p->radius = 0.0f;
+	p->feather = 1.0f;
+	p->innerColor = color;
+	p->outerColor = color;
+}
+
+
+// State handling
+void nvgSave(NVGcontext* ctx)
+{
+	if (ctx->nstates >= NVG_MAX_STATES)
+		return;
+	if (ctx->nstates > 0)
+		memcpy(&ctx->states[ctx->nstates], &ctx->states[ctx->nstates-1], sizeof(NVGstate));
+	ctx->nstates++;
+}
+
+void nvgRestore(NVGcontext* ctx)
+{
+	if (ctx->nstates <= 1)
+		return;
+	ctx->nstates--;
+}
+
+void nvgReset(NVGcontext* ctx)
+{
+	NVGstate* state = nvg__getState(ctx);
+	memset(state, 0, sizeof(*state));
+
+	nvg__setPaintColor(&state->fill, nvgRGBA(255,255,255,255));
+	nvg__setPaintColor(&state->stroke, nvgRGBA(0,0,0,255));
+	state->compositeOperation = nvg__compositeOperationState(NVG_SOURCE_OVER);
+	state->shapeAntiAlias = 1;
+	state->strokeWidth = 1.0f;
+	state->miterLimit = 10.0f;
+	state->lineCap = NVG_BUTT;
+	state->lineJoin = NVG_MITER;
+	state->alpha = 1.0f;
+	nvgTransformIdentity(state->xform);
+
+	state->scissor.extent[0] = -1.0f;
+	state->scissor.extent[1] = -1.0f;
+
+	state->fontSize = 16.0f;
+	state->letterSpacing = 0.0f;
+	state->lineHeight = 1.0f;
+	state->fontBlur = 0.0f;
+	state->textAlign = NVG_ALIGN_LEFT | NVG_ALIGN_BASELINE;
+	state->fontId = 0;
+}
+
+// State setting
+void nvgShapeAntiAlias(NVGcontext* ctx, int enabled)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->shapeAntiAlias = enabled;
+}
+
+void nvgStrokeWidth(NVGcontext* ctx, float width)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->strokeWidth = width;
+}
+
+void nvgMiterLimit(NVGcontext* ctx, float limit)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->miterLimit = limit;
+}
+
+void nvgLineCap(NVGcontext* ctx, int cap)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->lineCap = cap;
+}
+
+void nvgLineJoin(NVGcontext* ctx, int join)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->lineJoin = join;
+}
+
+void nvgGlobalAlpha(NVGcontext* ctx, float alpha)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->alpha = alpha;
+}
+
+void nvgTransform(NVGcontext* ctx, float a, float b, float c, float d, float e, float f)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float t[6] = { a, b, c, d, e, f };
+	nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgResetTransform(NVGcontext* ctx)
+{
+	NVGstate* state = nvg__getState(ctx);
+	nvgTransformIdentity(state->xform);
+}
+
+void nvgTranslate(NVGcontext* ctx, float x, float y)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float t[6];
+	nvgTransformTranslate(t, x,y);
+	nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgRotate(NVGcontext* ctx, float angle)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float t[6];
+	nvgTransformRotate(t, angle);
+	nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgSkewX(NVGcontext* ctx, float angle)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float t[6];
+	nvgTransformSkewX(t, angle);
+	nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgSkewY(NVGcontext* ctx, float angle)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float t[6];
+	nvgTransformSkewY(t, angle);
+	nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgScale(NVGcontext* ctx, float x, float y)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float t[6];
+	nvgTransformScale(t, x,y);
+	nvgTransformPremultiply(state->xform, t);
+}
+
+void nvgCurrentTransform(NVGcontext* ctx, float* xform)
+{
+	NVGstate* state = nvg__getState(ctx);
+	if (xform == NULL) return;
+	memcpy(xform, state->xform, sizeof(float)*6);
+}
+
+void nvgStrokeColor(NVGcontext* ctx, NVGcolor color)
+{
+	NVGstate* state = nvg__getState(ctx);
+	nvg__setPaintColor(&state->stroke, color);
+}
+
+void nvgStrokePaint(NVGcontext* ctx, NVGpaint paint)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->stroke = paint;
+	nvgTransformMultiply(state->stroke.xform, state->xform);
+}
+
+void nvgFillColor(NVGcontext* ctx, NVGcolor color)
+{
+	NVGstate* state = nvg__getState(ctx);
+	nvg__setPaintColor(&state->fill, color);
+}
+
+void nvgFillPaint(NVGcontext* ctx, NVGpaint paint)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->fill = paint;
+	nvgTransformMultiply(state->fill.xform, state->xform);
+}
+
+#ifndef NVG_NO_STB
+int nvgCreateImage(NVGcontext* ctx, const char* filename, int imageFlags)
+{
+	int w, h, n, image;
+	unsigned char* img;
+	stbi_set_unpremultiply_on_load(1);
+	stbi_convert_iphone_png_to_rgb(1);
+	img = stbi_load(filename, &w, &h, &n, 4);
+	if (img == NULL) {
+//		printf("Failed to load %s - %s\n", filename, stbi_failure_reason());
+		return 0;
+	}
+	image = nvgCreateImageRGBA(ctx, w, h, imageFlags, img);
+	stbi_image_free(img);
+	return image;
+}
+
+int nvgCreateImageMem(NVGcontext* ctx, int imageFlags, unsigned char* data, int ndata)
+{
+	int w, h, n, image;
+	unsigned char* img = stbi_load_from_memory(data, ndata, &w, &h, &n, 4);
+	if (img == NULL) {
+//		printf("Failed to load %s - %s\n", filename, stbi_failure_reason());
+		return 0;
+	}
+	image = nvgCreateImageRGBA(ctx, w, h, imageFlags, img);
+	stbi_image_free(img);
+	return image;
+}
+#endif
+
+int nvgCreateImageRGBA(NVGcontext* ctx, int w, int h, int imageFlags, const unsigned char* data)
+{
+	return ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_RGBA, w, h, imageFlags, data);
+}
+
+void nvgUpdateImage(NVGcontext* ctx, int image, const unsigned char* data)
+{
+	int w, h;
+	ctx->params.renderGetTextureSize(ctx->params.userPtr, image, &w, &h);
+	ctx->params.renderUpdateTexture(ctx->params.userPtr, image, 0,0, w,h, data);
+}
+
+void nvgImageSize(NVGcontext* ctx, int image, int* w, int* h)
+{
+	ctx->params.renderGetTextureSize(ctx->params.userPtr, image, w, h);
+}
+
+void nvgDeleteImage(NVGcontext* ctx, int image)
+{
+	ctx->params.renderDeleteTexture(ctx->params.userPtr, image);
+}
+
+NVGpaint nvgLinearGradient(NVGcontext* ctx,
+								  float sx, float sy, float ex, float ey,
+								  NVGcolor icol, NVGcolor ocol)
+{
+	NVGpaint p;
+	float dx, dy, d;
+	const float large = 1e5;
+	NVG_NOTUSED(ctx);
+	memset(&p, 0, sizeof(p));
+
+	// Calculate transform aligned to the line
+	dx = ex - sx;
+	dy = ey - sy;
+	d = sqrtf(dx*dx + dy*dy);
+	if (d > 0.0001f) {
+		dx /= d;
+		dy /= d;
+	} else {
+		dx = 0;
+		dy = 1;
+	}
+
+	p.xform[0] = dy; p.xform[1] = -dx;
+	p.xform[2] = dx; p.xform[3] = dy;
+	p.xform[4] = sx - dx*large; p.xform[5] = sy - dy*large;
+
+	p.extent[0] = large;
+	p.extent[1] = large + d*0.5f;
+
+	p.radius = 0.0f;
+
+	p.feather = nvg__maxf(1.0f, d);
+
+	p.innerColor = icol;
+	p.outerColor = ocol;
+
+	return p;
+}
+
+NVGpaint nvgRadialGradient(NVGcontext* ctx,
+								  float cx, float cy, float inr, float outr,
+								  NVGcolor icol, NVGcolor ocol)
+{
+	NVGpaint p;
+	float r = (inr+outr)*0.5f;
+	float f = (outr-inr);
+	NVG_NOTUSED(ctx);
+	memset(&p, 0, sizeof(p));
+
+	nvgTransformIdentity(p.xform);
+	p.xform[4] = cx;
+	p.xform[5] = cy;
+
+	p.extent[0] = r;
+	p.extent[1] = r;
+
+	p.radius = r;
+
+	p.feather = nvg__maxf(1.0f, f);
+
+	p.innerColor = icol;
+	p.outerColor = ocol;
+
+	return p;
+}
+
+NVGpaint nvgBoxGradient(NVGcontext* ctx,
+							   float x, float y, float w, float h, float r, float f,
+							   NVGcolor icol, NVGcolor ocol)
+{
+	NVGpaint p;
+	NVG_NOTUSED(ctx);
+	memset(&p, 0, sizeof(p));
+
+	nvgTransformIdentity(p.xform);
+	p.xform[4] = x+w*0.5f;
+	p.xform[5] = y+h*0.5f;
+
+	p.extent[0] = w*0.5f;
+	p.extent[1] = h*0.5f;
+
+	p.radius = r;
+
+	p.feather = nvg__maxf(1.0f, f);
+
+	p.innerColor = icol;
+	p.outerColor = ocol;
+
+	return p;
+}
+
+
+NVGpaint nvgImagePattern(NVGcontext* ctx,
+								float cx, float cy, float w, float h, float angle,
+								int image, float alpha)
+{
+	NVGpaint p;
+	NVG_NOTUSED(ctx);
+	memset(&p, 0, sizeof(p));
+
+	nvgTransformRotate(p.xform, angle);
+	p.xform[4] = cx;
+	p.xform[5] = cy;
+
+	p.extent[0] = w;
+	p.extent[1] = h;
+
+	p.image = image;
+
+	p.innerColor = p.outerColor = nvgRGBAf(1,1,1,alpha);
+
+	return p;
+}
+
+// Scissoring
+void nvgScissor(NVGcontext* ctx, float x, float y, float w, float h)
+{
+	NVGstate* state = nvg__getState(ctx);
+
+	w = nvg__maxf(0.0f, w);
+	h = nvg__maxf(0.0f, h);
+
+	nvgTransformIdentity(state->scissor.xform);
+	state->scissor.xform[4] = x+w*0.5f;
+	state->scissor.xform[5] = y+h*0.5f;
+	nvgTransformMultiply(state->scissor.xform, state->xform);
+
+	state->scissor.extent[0] = w*0.5f;
+	state->scissor.extent[1] = h*0.5f;
+}
+
+static void nvg__isectRects(float* dst,
+							float ax, float ay, float aw, float ah,
+							float bx, float by, float bw, float bh)
+{
+	float minx = nvg__maxf(ax, bx);
+	float miny = nvg__maxf(ay, by);
+	float maxx = nvg__minf(ax+aw, bx+bw);
+	float maxy = nvg__minf(ay+ah, by+bh);
+	dst[0] = minx;
+	dst[1] = miny;
+	dst[2] = nvg__maxf(0.0f, maxx - minx);
+	dst[3] = nvg__maxf(0.0f, maxy - miny);
+}
+
+void nvgIntersectScissor(NVGcontext* ctx, float x, float y, float w, float h)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float pxform[6], invxorm[6];
+	float rect[4];
+	float ex, ey, tex, tey;
+
+	// If no previous scissor has been set, set the scissor as current scissor.
+	if (state->scissor.extent[0] < 0) {
+		nvgScissor(ctx, x, y, w, h);
+		return;
+	}
+
+	// Transform the current scissor rect into current transform space.
+	// If there is difference in rotation, this will be approximation.
+	memcpy(pxform, state->scissor.xform, sizeof(float)*6);
+	ex = state->scissor.extent[0];
+	ey = state->scissor.extent[1];
+	nvgTransformInverse(invxorm, state->xform);
+	nvgTransformMultiply(pxform, invxorm);
+	tex = ex*nvg__absf(pxform[0]) + ey*nvg__absf(pxform[2]);
+	tey = ex*nvg__absf(pxform[1]) + ey*nvg__absf(pxform[3]);
+
+	// Intersect rects.
+	nvg__isectRects(rect, pxform[4]-tex,pxform[5]-tey,tex*2,tey*2, x,y,w,h);
+
+	nvgScissor(ctx, rect[0], rect[1], rect[2], rect[3]);
+}
+
+void nvgResetScissor(NVGcontext* ctx)
+{
+	NVGstate* state = nvg__getState(ctx);
+	memset(state->scissor.xform, 0, sizeof(state->scissor.xform));
+	state->scissor.extent[0] = -1.0f;
+	state->scissor.extent[1] = -1.0f;
+}
+
+// Global composite operation.
+void nvgGlobalCompositeOperation(NVGcontext* ctx, int op)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->compositeOperation = nvg__compositeOperationState(op);
+}
+
+void nvgGlobalCompositeBlendFunc(NVGcontext* ctx, int sfactor, int dfactor)
+{
+	nvgGlobalCompositeBlendFuncSeparate(ctx, sfactor, dfactor, sfactor, dfactor);
+}
+
+void nvgGlobalCompositeBlendFuncSeparate(NVGcontext* ctx, int srcRGB, int dstRGB, int srcAlpha, int dstAlpha)
+{
+	NVGcompositeOperationState op;
+	op.srcRGB = srcRGB;
+	op.dstRGB = dstRGB;
+	op.srcAlpha = srcAlpha;
+	op.dstAlpha = dstAlpha;
+
+	NVGstate* state = nvg__getState(ctx);
+	state->compositeOperation = op;
+}
+
+static int nvg__ptEquals(float x1, float y1, float x2, float y2, float tol)
+{
+	float dx = x2 - x1;
+	float dy = y2 - y1;
+	return dx*dx + dy*dy < tol*tol;
+}
+
+static float nvg__distPtSeg(float x, float y, float px, float py, float qx, float qy)
+{
+	float pqx, pqy, dx, dy, d, t;
+	pqx = qx-px;
+	pqy = qy-py;
+	dx = x-px;
+	dy = y-py;
+	d = pqx*pqx + pqy*pqy;
+	t = pqx*dx + pqy*dy;
+	if (d > 0) t /= d;
+	if (t < 0) t = 0;
+	else if (t > 1) t = 1;
+	dx = px + t*pqx - x;
+	dy = py + t*pqy - y;
+	return dx*dx + dy*dy;
+}
+
+static void nvg__appendCommands(NVGcontext* ctx, float* vals, int nvals)
+{
+	NVGstate* state = nvg__getState(ctx);
+	int i;
+
+	if (ctx->ncommands+nvals > ctx->ccommands) {
+		float* commands;
+		int ccommands = ctx->ncommands+nvals + ctx->ccommands/2;
+		commands = (float*)realloc(ctx->commands, sizeof(float)*ccommands);
+		if (commands == NULL) return;
+		ctx->commands = commands;
+		ctx->ccommands = ccommands;
+	}
+
+	if ((int)vals[0] != NVG_CLOSE && (int)vals[0] != NVG_WINDING) {
+		ctx->commandx = vals[nvals-2];
+		ctx->commandy = vals[nvals-1];
+	}
+
+	// transform commands
+	i = 0;
+	while (i < nvals) {
+		int cmd = (int)vals[i];
+		switch (cmd) {
+		case NVG_MOVETO:
+			nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]);
+			i += 3;
+			break;
+		case NVG_LINETO:
+			nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]);
+			i += 3;
+			break;
+		case NVG_BEZIERTO:
+			nvgTransformPoint(&vals[i+1],&vals[i+2], state->xform, vals[i+1],vals[i+2]);
+			nvgTransformPoint(&vals[i+3],&vals[i+4], state->xform, vals[i+3],vals[i+4]);
+			nvgTransformPoint(&vals[i+5],&vals[i+6], state->xform, vals[i+5],vals[i+6]);
+			i += 7;
+			break;
+		case NVG_CLOSE:
+			i++;
+			break;
+		case NVG_WINDING:
+			i += 2;
+			break;
+		default:
+			i++;
+		}
+	}
+
+	memcpy(&ctx->commands[ctx->ncommands], vals, nvals*sizeof(float));
+
+	ctx->ncommands += nvals;
+}
+
+
+static void nvg__clearPathCache(NVGcontext* ctx)
+{
+	ctx->cache->npoints = 0;
+	ctx->cache->npaths = 0;
+}
+
+static NVGpath* nvg__lastPath(NVGcontext* ctx)
+{
+	if (ctx->cache->npaths > 0)
+		return &ctx->cache->paths[ctx->cache->npaths-1];
+	return NULL;
+}
+
+static void nvg__addPath(NVGcontext* ctx)
+{
+	NVGpath* path;
+	if (ctx->cache->npaths+1 > ctx->cache->cpaths) {
+		NVGpath* paths;
+		int cpaths = ctx->cache->npaths+1 + ctx->cache->cpaths/2;
+		paths = (NVGpath*)realloc(ctx->cache->paths, sizeof(NVGpath)*cpaths);
+		if (paths == NULL) return;
+		ctx->cache->paths = paths;
+		ctx->cache->cpaths = cpaths;
+	}
+	path = &ctx->cache->paths[ctx->cache->npaths];
+	memset(path, 0, sizeof(*path));
+	path->first = ctx->cache->npoints;
+	path->winding = NVG_CCW;
+
+	ctx->cache->npaths++;
+}
+
+static NVGpoint* nvg__lastPoint(NVGcontext* ctx)
+{
+	if (ctx->cache->npoints > 0)
+		return &ctx->cache->points[ctx->cache->npoints-1];
+	return NULL;
+}
+
+static void nvg__addPoint(NVGcontext* ctx, float x, float y, int flags)
+{
+	NVGpath* path = nvg__lastPath(ctx);
+	NVGpoint* pt;
+	if (path == NULL) return;
+
+	if (path->count > 0 && ctx->cache->npoints > 0) {
+		pt = nvg__lastPoint(ctx);
+		if (nvg__ptEquals(pt->x,pt->y, x,y, ctx->distTol)) {
+			pt->flags |= flags;
+			return;
+		}
+	}
+
+	if (ctx->cache->npoints+1 > ctx->cache->cpoints) {
+		NVGpoint* points;
+		int cpoints = ctx->cache->npoints+1 + ctx->cache->cpoints/2;
+		points = (NVGpoint*)realloc(ctx->cache->points, sizeof(NVGpoint)*cpoints);
+		if (points == NULL) return;
+		ctx->cache->points = points;
+		ctx->cache->cpoints = cpoints;
+	}
+
+	pt = &ctx->cache->points[ctx->cache->npoints];
+	memset(pt, 0, sizeof(*pt));
+	pt->x = x;
+	pt->y = y;
+	pt->flags = (unsigned char)flags;
+
+	ctx->cache->npoints++;
+	path->count++;
+}
+
+static void nvg__closePath(NVGcontext* ctx)
+{
+	NVGpath* path = nvg__lastPath(ctx);
+	if (path == NULL) return;
+	path->closed = 1;
+}
+
+static void nvg__pathWinding(NVGcontext* ctx, int winding)
+{
+	NVGpath* path = nvg__lastPath(ctx);
+	if (path == NULL) return;
+	path->winding = winding;
+}
+
+static float nvg__getAverageScale(float *t)
+{
+	float sx = sqrtf(t[0]*t[0] + t[2]*t[2]);
+	float sy = sqrtf(t[1]*t[1] + t[3]*t[3]);
+	return (sx + sy) * 0.5f;
+}
+
+static NVGvertex* nvg__allocTempVerts(NVGcontext* ctx, int nverts)
+{
+	if (nverts > ctx->cache->cverts) {
+		NVGvertex* verts;
+		int cverts = (nverts + 0xff) & ~0xff; // Round up to prevent allocations when things change just slightly.
+		verts = (NVGvertex*)realloc(ctx->cache->verts, sizeof(NVGvertex)*cverts);
+		if (verts == NULL) return NULL;
+		ctx->cache->verts = verts;
+		ctx->cache->cverts = cverts;
+	}
+
+	return ctx->cache->verts;
+}
+
+static float nvg__triarea2(float ax, float ay, float bx, float by, float cx, float cy)
+{
+	float abx = bx - ax;
+	float aby = by - ay;
+	float acx = cx - ax;
+	float acy = cy - ay;
+	return acx*aby - abx*acy;
+}
+
+static float nvg__polyArea(NVGpoint* pts, int npts)
+{
+	int i;
+	float area = 0;
+	for (i = 2; i < npts; i++) {
+		NVGpoint* a = &pts[0];
+		NVGpoint* b = &pts[i-1];
+		NVGpoint* c = &pts[i];
+		area += nvg__triarea2(a->x,a->y, b->x,b->y, c->x,c->y);
+	}
+	return area * 0.5f;
+}
+
+static void nvg__polyReverse(NVGpoint* pts, int npts)
+{
+	NVGpoint tmp;
+	int i = 0, j = npts-1;
+	while (i < j) {
+		tmp = pts[i];
+		pts[i] = pts[j];
+		pts[j] = tmp;
+		i++;
+		j--;
+	}
+}
+
+
+static void nvg__vset(NVGvertex* vtx, float x, float y, float u, float v)
+{
+	vtx->x = x;
+	vtx->y = y;
+	vtx->u = u;
+	vtx->v = v;
+}
+
+static void nvg__tesselateBezier(NVGcontext* ctx,
+								 float x1, float y1, float x2, float y2,
+								 float x3, float y3, float x4, float y4,
+								 int level, int type)
+{
+	float x12,y12,x23,y23,x34,y34,x123,y123,x234,y234,x1234,y1234;
+	float dx,dy,d2,d3;
+
+	if (level > 10) return;
+
+	x12 = (x1+x2)*0.5f;
+	y12 = (y1+y2)*0.5f;
+	x23 = (x2+x3)*0.5f;
+	y23 = (y2+y3)*0.5f;
+	x34 = (x3+x4)*0.5f;
+	y34 = (y3+y4)*0.5f;
+	x123 = (x12+x23)*0.5f;
+	y123 = (y12+y23)*0.5f;
+
+	dx = x4 - x1;
+	dy = y4 - y1;
+	d2 = nvg__absf(((x2 - x4) * dy - (y2 - y4) * dx));
+	d3 = nvg__absf(((x3 - x4) * dy - (y3 - y4) * dx));
+
+	if ((d2 + d3)*(d2 + d3) < ctx->tessTol * (dx*dx + dy*dy)) {
+		nvg__addPoint(ctx, x4, y4, type);
+		return;
+	}
+
+/*	if (nvg__absf(x1+x3-x2-x2) + nvg__absf(y1+y3-y2-y2) + nvg__absf(x2+x4-x3-x3) + nvg__absf(y2+y4-y3-y3) < ctx->tessTol) {
+		nvg__addPoint(ctx, x4, y4, type);
+		return;
+	}*/
+
+	x234 = (x23+x34)*0.5f;
+	y234 = (y23+y34)*0.5f;
+	x1234 = (x123+x234)*0.5f;
+	y1234 = (y123+y234)*0.5f;
+
+	nvg__tesselateBezier(ctx, x1,y1, x12,y12, x123,y123, x1234,y1234, level+1, 0);
+	nvg__tesselateBezier(ctx, x1234,y1234, x234,y234, x34,y34, x4,y4, level+1, type);
+}
+
+static void nvg__flattenPaths(NVGcontext* ctx)
+{
+	NVGpathCache* cache = ctx->cache;
+//	NVGstate* state = nvg__getState(ctx);
+	NVGpoint* last;
+	NVGpoint* p0;
+	NVGpoint* p1;
+	NVGpoint* pts;
+	NVGpath* path;
+	int i, j;
+	float* cp1;
+	float* cp2;
+	float* p;
+	float area;
+
+	if (cache->npaths > 0)
+		return;
+
+	// Flatten
+	i = 0;
+	while (i < ctx->ncommands) {
+		int cmd = (int)ctx->commands[i];
+		switch (cmd) {
+		case NVG_MOVETO:
+			nvg__addPath(ctx);
+			p = &ctx->commands[i+1];
+			nvg__addPoint(ctx, p[0], p[1], NVG_PT_CORNER);
+			i += 3;
+			break;
+		case NVG_LINETO:
+			p = &ctx->commands[i+1];
+			nvg__addPoint(ctx, p[0], p[1], NVG_PT_CORNER);
+			i += 3;
+			break;
+		case NVG_BEZIERTO:
+			last = nvg__lastPoint(ctx);
+			if (last != NULL) {
+				cp1 = &ctx->commands[i+1];
+				cp2 = &ctx->commands[i+3];
+				p = &ctx->commands[i+5];
+				nvg__tesselateBezier(ctx, last->x,last->y, cp1[0],cp1[1], cp2[0],cp2[1], p[0],p[1], 0, NVG_PT_CORNER);
+			}
+			i += 7;
+			break;
+		case NVG_CLOSE:
+			nvg__closePath(ctx);
+			i++;
+			break;
+		case NVG_WINDING:
+			nvg__pathWinding(ctx, (int)ctx->commands[i+1]);
+			i += 2;
+			break;
+		default:
+			i++;
+		}
+	}
+
+	cache->bounds[0] = cache->bounds[1] = 1e6f;
+	cache->bounds[2] = cache->bounds[3] = -1e6f;
+
+	// Calculate the direction and length of line segments.
+	for (j = 0; j < cache->npaths; j++) {
+		path = &cache->paths[j];
+		pts = &cache->points[path->first];
+
+		// If the first and last points are the same, remove the last, mark as closed path.
+		p0 = &pts[path->count-1];
+		p1 = &pts[0];
+		if (nvg__ptEquals(p0->x,p0->y, p1->x,p1->y, ctx->distTol)) {
+			path->count--;
+			p0 = &pts[path->count-1];
+			path->closed = 1;
+		}
+
+		// Enforce winding.
+		if (path->count > 2) {
+			area = nvg__polyArea(pts, path->count);
+			if (path->winding == NVG_CCW && area < 0.0f)
+				nvg__polyReverse(pts, path->count);
+			if (path->winding == NVG_CW && area > 0.0f)
+				nvg__polyReverse(pts, path->count);
+		}
+
+		for(i = 0; i < path->count; i++) {
+			// Calculate segment direction and length
+			p0->dx = p1->x - p0->x;
+			p0->dy = p1->y - p0->y;
+			p0->len = nvg__normalize(&p0->dx, &p0->dy);
+			// Update bounds
+			cache->bounds[0] = nvg__minf(cache->bounds[0], p0->x);
+			cache->bounds[1] = nvg__minf(cache->bounds[1], p0->y);
+			cache->bounds[2] = nvg__maxf(cache->bounds[2], p0->x);
+			cache->bounds[3] = nvg__maxf(cache->bounds[3], p0->y);
+			// Advance
+			p0 = p1++;
+		}
+	}
+}
+
+static int nvg__curveDivs(float r, float arc, float tol)
+{
+	float da = acosf(r / (r + tol)) * 2.0f;
+	return nvg__maxi(2, (int)ceilf(arc / da));
+}
+
+static void nvg__chooseBevel(int bevel, NVGpoint* p0, NVGpoint* p1, float w,
+							float* x0, float* y0, float* x1, float* y1)
+{
+	if (bevel) {
+		*x0 = p1->x + p0->dy * w;
+		*y0 = p1->y - p0->dx * w;
+		*x1 = p1->x + p1->dy * w;
+		*y1 = p1->y - p1->dx * w;
+	} else {
+		*x0 = p1->x + p1->dmx * w;
+		*y0 = p1->y + p1->dmy * w;
+		*x1 = p1->x + p1->dmx * w;
+		*y1 = p1->y + p1->dmy * w;
+	}
+}
+
+static NVGvertex* nvg__roundJoin(NVGvertex* dst, NVGpoint* p0, NVGpoint* p1,
+								 float lw, float rw, float lu, float ru, int ncap,
+								 float fringe)
+{
+	int i, n;
+	float dlx0 = p0->dy;
+	float dly0 = -p0->dx;
+	float dlx1 = p1->dy;
+	float dly1 = -p1->dx;
+	NVG_NOTUSED(fringe);
+
+	if (p1->flags & NVG_PT_LEFT) {
+		float lx0,ly0,lx1,ly1,a0,a1;
+		nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, lw, &lx0,&ly0, &lx1,&ly1);
+		a0 = atan2f(-dly0, -dlx0);
+		a1 = atan2f(-dly1, -dlx1);
+		if (a1 > a0) a1 -= NVG_PI*2;
+
+		nvg__vset(dst, lx0, ly0, lu,1); dst++;
+		nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+		n = nvg__clampi((int)ceilf(((a0 - a1) / NVG_PI) * ncap), 2, ncap);
+		for (i = 0; i < n; i++) {
+			float u = i/(float)(n-1);
+			float a = a0 + u*(a1-a0);
+			float rx = p1->x + cosf(a) * rw;
+			float ry = p1->y + sinf(a) * rw;
+			nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+			nvg__vset(dst, rx, ry, ru,1); dst++;
+		}
+
+		nvg__vset(dst, lx1, ly1, lu,1); dst++;
+		nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+
+	} else {
+		float rx0,ry0,rx1,ry1,a0,a1;
+		nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, -rw, &rx0,&ry0, &rx1,&ry1);
+		a0 = atan2f(dly0, dlx0);
+		a1 = atan2f(dly1, dlx1);
+		if (a1 < a0) a1 += NVG_PI*2;
+
+		nvg__vset(dst, p1->x + dlx0*rw, p1->y + dly0*rw, lu,1); dst++;
+		nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+		n = nvg__clampi((int)ceilf(((a1 - a0) / NVG_PI) * ncap), 2, ncap);
+		for (i = 0; i < n; i++) {
+			float u = i/(float)(n-1);
+			float a = a0 + u*(a1-a0);
+			float lx = p1->x + cosf(a) * lw;
+			float ly = p1->y + sinf(a) * lw;
+			nvg__vset(dst, lx, ly, lu,1); dst++;
+			nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+		}
+
+		nvg__vset(dst, p1->x + dlx1*rw, p1->y + dly1*rw, lu,1); dst++;
+		nvg__vset(dst, rx1, ry1, ru,1); dst++;
+
+	}
+	return dst;
+}
+
+static NVGvertex* nvg__bevelJoin(NVGvertex* dst, NVGpoint* p0, NVGpoint* p1,
+										float lw, float rw, float lu, float ru, float fringe)
+{
+	float rx0,ry0,rx1,ry1;
+	float lx0,ly0,lx1,ly1;
+	float dlx0 = p0->dy;
+	float dly0 = -p0->dx;
+	float dlx1 = p1->dy;
+	float dly1 = -p1->dx;
+	NVG_NOTUSED(fringe);
+
+	if (p1->flags & NVG_PT_LEFT) {
+		nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, lw, &lx0,&ly0, &lx1,&ly1);
+
+		nvg__vset(dst, lx0, ly0, lu,1); dst++;
+		nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+		if (p1->flags & NVG_PT_BEVEL) {
+			nvg__vset(dst, lx0, ly0, lu,1); dst++;
+			nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+			nvg__vset(dst, lx1, ly1, lu,1); dst++;
+			nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+		} else {
+			rx0 = p1->x - p1->dmx * rw;
+			ry0 = p1->y - p1->dmy * rw;
+
+			nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+			nvg__vset(dst, p1->x - dlx0*rw, p1->y - dly0*rw, ru,1); dst++;
+
+			nvg__vset(dst, rx0, ry0, ru,1); dst++;
+			nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+			nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+			nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+		}
+
+		nvg__vset(dst, lx1, ly1, lu,1); dst++;
+		nvg__vset(dst, p1->x - dlx1*rw, p1->y - dly1*rw, ru,1); dst++;
+
+	} else {
+		nvg__chooseBevel(p1->flags & NVG_PR_INNERBEVEL, p0, p1, -rw, &rx0,&ry0, &rx1,&ry1);
+
+		nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++;
+		nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+		if (p1->flags & NVG_PT_BEVEL) {
+			nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++;
+			nvg__vset(dst, rx0, ry0, ru,1); dst++;
+
+			nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++;
+			nvg__vset(dst, rx1, ry1, ru,1); dst++;
+		} else {
+			lx0 = p1->x + p1->dmx * lw;
+			ly0 = p1->y + p1->dmy * lw;
+
+			nvg__vset(dst, p1->x + dlx0*lw, p1->y + dly0*lw, lu,1); dst++;
+			nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+
+			nvg__vset(dst, lx0, ly0, lu,1); dst++;
+			nvg__vset(dst, lx0, ly0, lu,1); dst++;
+
+			nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++;
+			nvg__vset(dst, p1->x, p1->y, 0.5f,1); dst++;
+		}
+
+		nvg__vset(dst, p1->x + dlx1*lw, p1->y + dly1*lw, lu,1); dst++;
+		nvg__vset(dst, rx1, ry1, ru,1); dst++;
+	}
+
+	return dst;
+}
+
+static NVGvertex* nvg__buttCapStart(NVGvertex* dst, NVGpoint* p,
+									float dx, float dy, float w, float d,
+									float aa, float u0, float u1)
+{
+	float px = p->x - dx*d;
+	float py = p->y - dy*d;
+	float dlx = dy;
+	float dly = -dx;
+	nvg__vset(dst, px + dlx*w - dx*aa, py + dly*w - dy*aa, u0,0); dst++;
+	nvg__vset(dst, px - dlx*w - dx*aa, py - dly*w - dy*aa, u1,0); dst++;
+	nvg__vset(dst, px + dlx*w, py + dly*w, u0,1); dst++;
+	nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); dst++;
+	return dst;
+}
+
+static NVGvertex* nvg__buttCapEnd(NVGvertex* dst, NVGpoint* p,
+								  float dx, float dy, float w, float d,
+								  float aa, float u0, float u1)
+{
+	float px = p->x + dx*d;
+	float py = p->y + dy*d;
+	float dlx = dy;
+	float dly = -dx;
+	nvg__vset(dst, px + dlx*w, py + dly*w, u0,1); dst++;
+	nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); dst++;
+	nvg__vset(dst, px + dlx*w + dx*aa, py + dly*w + dy*aa, u0,0); dst++;
+	nvg__vset(dst, px - dlx*w + dx*aa, py - dly*w + dy*aa, u1,0); dst++;
+	return dst;
+}
+
+
+static NVGvertex* nvg__roundCapStart(NVGvertex* dst, NVGpoint* p,
+									 float dx, float dy, float w, int ncap,
+									 float aa, float u0, float u1)
+{
+	int i;
+	float px = p->x;
+	float py = p->y;
+	float dlx = dy;
+	float dly = -dx;
+	NVG_NOTUSED(aa);
+	for (i = 0; i < ncap; i++) {
+		float a = i/(float)(ncap-1)*NVG_PI;
+		float ax = cosf(a) * w, ay = sinf(a) * w;
+		nvg__vset(dst, px - dlx*ax - dx*ay, py - dly*ax - dy*ay, u0,1); dst++;
+		nvg__vset(dst, px, py, 0.5f,1); dst++;
+	}
+	nvg__vset(dst, px + dlx*w, py + dly*w, u0,1); dst++;
+	nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); dst++;
+	return dst;
+}
+
+static NVGvertex* nvg__roundCapEnd(NVGvertex* dst, NVGpoint* p,
+								   float dx, float dy, float w, int ncap,
+								   float aa, float u0, float u1)
+{
+	int i;
+	float px = p->x;
+	float py = p->y;
+	float dlx = dy;
+	float dly = -dx;
+	NVG_NOTUSED(aa);
+	nvg__vset(dst, px + dlx*w, py + dly*w, u0,1); dst++;
+	nvg__vset(dst, px - dlx*w, py - dly*w, u1,1); dst++;
+	for (i = 0; i < ncap; i++) {
+		float a = i/(float)(ncap-1)*NVG_PI;
+		float ax = cosf(a) * w, ay = sinf(a) * w;
+		nvg__vset(dst, px, py, 0.5f,1); dst++;
+		nvg__vset(dst, px - dlx*ax + dx*ay, py - dly*ax + dy*ay, u0,1); dst++;
+	}
+	return dst;
+}
+
+
+static void nvg__calculateJoins(NVGcontext* ctx, float w, int lineJoin, float miterLimit)
+{
+	NVGpathCache* cache = ctx->cache;
+	int i, j;
+	float iw = 0.0f;
+
+	if (w > 0.0f) iw = 1.0f / w;
+
+	// Calculate which joins needs extra vertices to append, and gather vertex count.
+	for (i = 0; i < cache->npaths; i++) {
+		NVGpath* path = &cache->paths[i];
+		NVGpoint* pts = &cache->points[path->first];
+		NVGpoint* p0 = &pts[path->count-1];
+		NVGpoint* p1 = &pts[0];
+		int nleft = 0;
+
+		path->nbevel = 0;
+
+		for (j = 0; j < path->count; j++) {
+			float dlx0, dly0, dlx1, dly1, dmr2, cross, limit;
+			dlx0 = p0->dy;
+			dly0 = -p0->dx;
+			dlx1 = p1->dy;
+			dly1 = -p1->dx;
+			// Calculate extrusions
+			p1->dmx = (dlx0 + dlx1) * 0.5f;
+			p1->dmy = (dly0 + dly1) * 0.5f;
+			dmr2 = p1->dmx*p1->dmx + p1->dmy*p1->dmy;
+			if (dmr2 > 0.000001f) {
+				float scale = 1.0f / dmr2;
+				if (scale > 600.0f) {
+					scale = 600.0f;
+				}
+				p1->dmx *= scale;
+				p1->dmy *= scale;
+			}
+
+			// Clear flags, but keep the corner.
+			p1->flags = (p1->flags & NVG_PT_CORNER) ? NVG_PT_CORNER : 0;
+
+			// Keep track of left turns.
+			cross = p1->dx * p0->dy - p0->dx * p1->dy;
+			if (cross > 0.0f) {
+				nleft++;
+				p1->flags |= NVG_PT_LEFT;
+			}
+
+			// Calculate if we should use bevel or miter for inner join.
+			limit = nvg__maxf(1.01f, nvg__minf(p0->len, p1->len) * iw);
+			if ((dmr2 * limit*limit) < 1.0f)
+				p1->flags |= NVG_PR_INNERBEVEL;
+
+			// Check to see if the corner needs to be beveled.
+			if (p1->flags & NVG_PT_CORNER) {
+				if ((dmr2 * miterLimit*miterLimit) < 1.0f || lineJoin == NVG_BEVEL || lineJoin == NVG_ROUND) {
+					p1->flags |= NVG_PT_BEVEL;
+				}
+			}
+
+			if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0)
+				path->nbevel++;
+
+			p0 = p1++;
+		}
+
+		path->convex = (nleft == path->count) ? 1 : 0;
+	}
+}
+
+
+static int nvg__expandStroke(NVGcontext* ctx, float w, float fringe, int lineCap, int lineJoin, float miterLimit)
+{
+	NVGpathCache* cache = ctx->cache;
+	NVGvertex* verts;
+	NVGvertex* dst;
+	int cverts, i, j;
+	float aa = fringe;//ctx->fringeWidth;
+	float u0 = 0.0f, u1 = 1.0f;
+	int ncap = nvg__curveDivs(w, NVG_PI, ctx->tessTol);	// Calculate divisions per half circle.
+
+	w += aa * 0.5f;
+
+	// Disable the gradient used for antialiasing when antialiasing is not used.
+	if (aa == 0.0f) {
+		u0 = 0.5f;
+		u1 = 0.5f;
+	}
+
+	nvg__calculateJoins(ctx, w, lineJoin, miterLimit);
+
+	// Calculate max vertex usage.
+	cverts = 0;
+	for (i = 0; i < cache->npaths; i++) {
+		NVGpath* path = &cache->paths[i];
+		int loop = (path->closed == 0) ? 0 : 1;
+		if (lineJoin == NVG_ROUND)
+			cverts += (path->count + path->nbevel*(ncap+2) + 1) * 2; // plus one for loop
+		else
+			cverts += (path->count + path->nbevel*5 + 1) * 2; // plus one for loop
+		if (loop == 0) {
+			// space for caps
+			if (lineCap == NVG_ROUND) {
+				cverts += (ncap*2 + 2)*2;
+			} else {
+				cverts += (3+3)*2;
+			}
+		}
+	}
+
+	verts = nvg__allocTempVerts(ctx, cverts);
+	if (verts == NULL) return 0;
+
+	for (i = 0; i < cache->npaths; i++) {
+		NVGpath* path = &cache->paths[i];
+		NVGpoint* pts = &cache->points[path->first];
+		NVGpoint* p0;
+		NVGpoint* p1;
+		int s, e, loop;
+		float dx, dy;
+
+		path->fill = 0;
+		path->nfill = 0;
+
+		// Calculate fringe or stroke
+		loop = (path->closed == 0) ? 0 : 1;
+		dst = verts;
+		path->stroke = dst;
+
+		if (loop) {
+			// Looping
+			p0 = &pts[path->count-1];
+			p1 = &pts[0];
+			s = 0;
+			e = path->count;
+		} else {
+			// Add cap
+			p0 = &pts[0];
+			p1 = &pts[1];
+			s = 1;
+			e = path->count-1;
+		}
+
+		if (loop == 0) {
+			// Add cap
+			dx = p1->x - p0->x;
+			dy = p1->y - p0->y;
+			nvg__normalize(&dx, &dy);
+			if (lineCap == NVG_BUTT)
+				dst = nvg__buttCapStart(dst, p0, dx, dy, w, -aa*0.5f, aa, u0, u1);
+			else if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE)
+				dst = nvg__buttCapStart(dst, p0, dx, dy, w, w-aa, aa, u0, u1);
+			else if (lineCap == NVG_ROUND)
+				dst = nvg__roundCapStart(dst, p0, dx, dy, w, ncap, aa, u0, u1);
+		}
+
+		for (j = s; j < e; ++j) {
+			if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0) {
+				if (lineJoin == NVG_ROUND) {
+					dst = nvg__roundJoin(dst, p0, p1, w, w, u0, u1, ncap, aa);
+				} else {
+					dst = nvg__bevelJoin(dst, p0, p1, w, w, u0, u1, aa);
+				}
+			} else {
+				nvg__vset(dst, p1->x + (p1->dmx * w), p1->y + (p1->dmy * w), u0,1); dst++;
+				nvg__vset(dst, p1->x - (p1->dmx * w), p1->y - (p1->dmy * w), u1,1); dst++;
+			}
+			p0 = p1++;
+		}
+
+		if (loop) {
+			// Loop it
+			nvg__vset(dst, verts[0].x, verts[0].y, u0,1); dst++;
+			nvg__vset(dst, verts[1].x, verts[1].y, u1,1); dst++;
+		} else {
+			// Add cap
+			dx = p1->x - p0->x;
+			dy = p1->y - p0->y;
+			nvg__normalize(&dx, &dy);
+			if (lineCap == NVG_BUTT)
+				dst = nvg__buttCapEnd(dst, p1, dx, dy, w, -aa*0.5f, aa, u0, u1);
+			else if (lineCap == NVG_BUTT || lineCap == NVG_SQUARE)
+				dst = nvg__buttCapEnd(dst, p1, dx, dy, w, w-aa, aa, u0, u1);
+			else if (lineCap == NVG_ROUND)
+				dst = nvg__roundCapEnd(dst, p1, dx, dy, w, ncap, aa, u0, u1);
+		}
+
+		path->nstroke = (int)(dst - verts);
+
+		verts = dst;
+	}
+
+	return 1;
+}
+
+static int nvg__expandFill(NVGcontext* ctx, float w, int lineJoin, float miterLimit)
+{
+	NVGpathCache* cache = ctx->cache;
+	NVGvertex* verts;
+	NVGvertex* dst;
+	int cverts, convex, i, j;
+	float aa = ctx->fringeWidth;
+	int fringe = w > 0.0f;
+
+	nvg__calculateJoins(ctx, w, lineJoin, miterLimit);
+
+	// Calculate max vertex usage.
+	cverts = 0;
+	for (i = 0; i < cache->npaths; i++) {
+		NVGpath* path = &cache->paths[i];
+		cverts += path->count + path->nbevel + 1;
+		if (fringe)
+			cverts += (path->count + path->nbevel*5 + 1) * 2; // plus one for loop
+	}
+
+	verts = nvg__allocTempVerts(ctx, cverts);
+	if (verts == NULL) return 0;
+
+	convex = cache->npaths == 1 && cache->paths[0].convex;
+
+	for (i = 0; i < cache->npaths; i++) {
+		NVGpath* path = &cache->paths[i];
+		NVGpoint* pts = &cache->points[path->first];
+		NVGpoint* p0;
+		NVGpoint* p1;
+		float rw, lw, woff;
+		float ru, lu;
+
+		// Calculate shape vertices.
+		woff = 0.5f*aa;
+		dst = verts;
+		path->fill = dst;
+
+		if (fringe) {
+			// Looping
+			p0 = &pts[path->count-1];
+			p1 = &pts[0];
+			for (j = 0; j < path->count; ++j) {
+				if (p1->flags & NVG_PT_BEVEL) {
+					float dlx0 = p0->dy;
+					float dly0 = -p0->dx;
+					float dlx1 = p1->dy;
+					float dly1 = -p1->dx;
+					if (p1->flags & NVG_PT_LEFT) {
+						float lx = p1->x + p1->dmx * woff;
+						float ly = p1->y + p1->dmy * woff;
+						nvg__vset(dst, lx, ly, 0.5f,1); dst++;
+					} else {
+						float lx0 = p1->x + dlx0 * woff;
+						float ly0 = p1->y + dly0 * woff;
+						float lx1 = p1->x + dlx1 * woff;
+						float ly1 = p1->y + dly1 * woff;
+						nvg__vset(dst, lx0, ly0, 0.5f,1); dst++;
+						nvg__vset(dst, lx1, ly1, 0.5f,1); dst++;
+					}
+				} else {
+					nvg__vset(dst, p1->x + (p1->dmx * woff), p1->y + (p1->dmy * woff), 0.5f,1); dst++;
+				}
+				p0 = p1++;
+			}
+		} else {
+			for (j = 0; j < path->count; ++j) {
+				nvg__vset(dst, pts[j].x, pts[j].y, 0.5f,1);
+				dst++;
+			}
+		}
+
+		path->nfill = (int)(dst - verts);
+		verts = dst;
+
+		// Calculate fringe
+		if (fringe) {
+			lw = w + woff;
+			rw = w - woff;
+			lu = 0;
+			ru = 1;
+			dst = verts;
+			path->stroke = dst;
+
+			// Create only half a fringe for convex shapes so that
+			// the shape can be rendered without stenciling.
+			if (convex) {
+				lw = woff;	// This should generate the same vertex as fill inset above.
+				lu = 0.5f;	// Set outline fade at middle.
+			}
+
+			// Looping
+			p0 = &pts[path->count-1];
+			p1 = &pts[0];
+
+			for (j = 0; j < path->count; ++j) {
+				if ((p1->flags & (NVG_PT_BEVEL | NVG_PR_INNERBEVEL)) != 0) {
+					dst = nvg__bevelJoin(dst, p0, p1, lw, rw, lu, ru, ctx->fringeWidth);
+				} else {
+					nvg__vset(dst, p1->x + (p1->dmx * lw), p1->y + (p1->dmy * lw), lu,1); dst++;
+					nvg__vset(dst, p1->x - (p1->dmx * rw), p1->y - (p1->dmy * rw), ru,1); dst++;
+				}
+				p0 = p1++;
+			}
+
+			// Loop it
+			nvg__vset(dst, verts[0].x, verts[0].y, lu,1); dst++;
+			nvg__vset(dst, verts[1].x, verts[1].y, ru,1); dst++;
+
+			path->nstroke = (int)(dst - verts);
+			verts = dst;
+		} else {
+			path->stroke = NULL;
+			path->nstroke = 0;
+		}
+	}
+
+	return 1;
+}
+
+
+// Draw
+void nvgBeginPath(NVGcontext* ctx)
+{
+	ctx->ncommands = 0;
+	nvg__clearPathCache(ctx);
+}
+
+void nvgMoveTo(NVGcontext* ctx, float x, float y)
+{
+	float vals[] = { NVG_MOVETO, x, y };
+	nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgLineTo(NVGcontext* ctx, float x, float y)
+{
+	float vals[] = { NVG_LINETO, x, y };
+	nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgBezierTo(NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y)
+{
+	float vals[] = { NVG_BEZIERTO, c1x, c1y, c2x, c2y, x, y };
+	nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgQuadTo(NVGcontext* ctx, float cx, float cy, float x, float y)
+{
+    float x0 = ctx->commandx;
+    float y0 = ctx->commandy;
+    float vals[] = { NVG_BEZIERTO,
+        x0 + 2.0f/3.0f*(cx - x0), y0 + 2.0f/3.0f*(cy - y0),
+        x + 2.0f/3.0f*(cx - x), y + 2.0f/3.0f*(cy - y),
+        x, y };
+    nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgArcTo(NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius)
+{
+	float x0 = ctx->commandx;
+	float y0 = ctx->commandy;
+	float dx0,dy0, dx1,dy1, a, d, cx,cy, a0,a1;
+	int dir;
+
+	if (ctx->ncommands == 0) {
+		return;
+	}
+
+	// Handle degenerate cases.
+	if (nvg__ptEquals(x0,y0, x1,y1, ctx->distTol) ||
+		nvg__ptEquals(x1,y1, x2,y2, ctx->distTol) ||
+		nvg__distPtSeg(x1,y1, x0,y0, x2,y2) < ctx->distTol*ctx->distTol ||
+		radius < ctx->distTol) {
+		nvgLineTo(ctx, x1,y1);
+		return;
+	}
+
+	// Calculate tangential circle to lines (x0,y0)-(x1,y1) and (x1,y1)-(x2,y2).
+	dx0 = x0-x1;
+	dy0 = y0-y1;
+	dx1 = x2-x1;
+	dy1 = y2-y1;
+	nvg__normalize(&dx0,&dy0);
+	nvg__normalize(&dx1,&dy1);
+	a = nvg__acosf(dx0*dx1 + dy0*dy1);
+	d = radius / nvg__tanf(a/2.0f);
+
+//	printf("a=%f° d=%f\n", a/NVG_PI*180.0f, d);
+
+	if (d > 10000.0f) {
+		nvgLineTo(ctx, x1,y1);
+		return;
+	}
+
+	if (nvg__cross(dx0,dy0, dx1,dy1) > 0.0f) {
+		cx = x1 + dx0*d + dy0*radius;
+		cy = y1 + dy0*d + -dx0*radius;
+		a0 = nvg__atan2f(dx0, -dy0);
+		a1 = nvg__atan2f(-dx1, dy1);
+		dir = NVG_CW;
+//		printf("CW c=(%f, %f) a0=%f° a1=%f°\n", cx, cy, a0/NVG_PI*180.0f, a1/NVG_PI*180.0f);
+	} else {
+		cx = x1 + dx0*d + -dy0*radius;
+		cy = y1 + dy0*d + dx0*radius;
+		a0 = nvg__atan2f(-dx0, dy0);
+		a1 = nvg__atan2f(dx1, -dy1);
+		dir = NVG_CCW;
+//		printf("CCW c=(%f, %f) a0=%f° a1=%f°\n", cx, cy, a0/NVG_PI*180.0f, a1/NVG_PI*180.0f);
+	}
+
+	nvgArc(ctx, cx, cy, radius, a0, a1, dir);
+}
+
+void nvgClosePath(NVGcontext* ctx)
+{
+	float vals[] = { NVG_CLOSE };
+	nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgPathWinding(NVGcontext* ctx, int dir)
+{
+	float vals[] = { NVG_WINDING, (float)dir };
+	nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgArc(NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir)
+{
+	float a = 0, da = 0, hda = 0, kappa = 0;
+	float dx = 0, dy = 0, x = 0, y = 0, tanx = 0, tany = 0;
+	float px = 0, py = 0, ptanx = 0, ptany = 0;
+	float vals[3 + 5*7 + 100];
+	int i, ndivs, nvals;
+	int move = ctx->ncommands > 0 ? NVG_LINETO : NVG_MOVETO;
+
+	// Clamp angles
+	da = a1 - a0;
+	if (dir == NVG_CW) {
+		if (nvg__absf(da) >= NVG_PI*2) {
+			da = NVG_PI*2;
+		} else {
+			while (da < 0.0f) da += NVG_PI*2;
+		}
+	} else {
+		if (nvg__absf(da) >= NVG_PI*2) {
+			da = -NVG_PI*2;
+		} else {
+			while (da > 0.0f) da -= NVG_PI*2;
+		}
+	}
+
+	// Split arc into max 90 degree segments.
+	ndivs = nvg__maxi(1, nvg__mini((int)(nvg__absf(da) / (NVG_PI*0.5f) + 0.5f), 5));
+	hda = (da / (float)ndivs) / 2.0f;
+	kappa = nvg__absf(4.0f / 3.0f * (1.0f - nvg__cosf(hda)) / nvg__sinf(hda));
+
+	if (dir == NVG_CCW)
+		kappa = -kappa;
+
+	nvals = 0;
+	for (i = 0; i <= ndivs; i++) {
+		a = a0 + da * (i/(float)ndivs);
+		dx = nvg__cosf(a);
+		dy = nvg__sinf(a);
+		x = cx + dx*r;
+		y = cy + dy*r;
+		tanx = -dy*r*kappa;
+		tany = dx*r*kappa;
+
+		if (i == 0) {
+			vals[nvals++] = (float)move;
+			vals[nvals++] = x;
+			vals[nvals++] = y;
+		} else {
+			vals[nvals++] = NVG_BEZIERTO;
+			vals[nvals++] = px+ptanx;
+			vals[nvals++] = py+ptany;
+			vals[nvals++] = x-tanx;
+			vals[nvals++] = y-tany;
+			vals[nvals++] = x;
+			vals[nvals++] = y;
+		}
+		px = x;
+		py = y;
+		ptanx = tanx;
+		ptany = tany;
+	}
+
+	nvg__appendCommands(ctx, vals, nvals);
+}
+
+void nvgRect(NVGcontext* ctx, float x, float y, float w, float h)
+{
+	float vals[] = {
+		NVG_MOVETO, x,y,
+		NVG_LINETO, x,y+h,
+		NVG_LINETO, x+w,y+h,
+		NVG_LINETO, x+w,y,
+		NVG_CLOSE
+	};
+	nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgRoundedRect(NVGcontext* ctx, float x, float y, float w, float h, float r)
+{
+	nvgRoundedRectVarying(ctx, x, y, w, h, r, r, r, r);
+}
+
+void nvgRoundedRectVarying(NVGcontext* ctx, float x, float y, float w, float h, float radTopLeft, float radTopRight, float radBottomRight, float radBottomLeft)
+{
+	if(radTopLeft < 0.1f && radTopRight < 0.1f && radBottomRight < 0.1f && radBottomLeft < 0.1f) {
+		nvgRect(ctx, x, y, w, h);
+		return;
+	} else {
+		float halfw = nvg__absf(w)*0.5f;
+		float halfh = nvg__absf(h)*0.5f;
+		float rxBL = nvg__minf(radBottomLeft, halfw) * nvg__signf(w), ryBL = nvg__minf(radBottomLeft, halfh) * nvg__signf(h);
+		float rxBR = nvg__minf(radBottomRight, halfw) * nvg__signf(w), ryBR = nvg__minf(radBottomRight, halfh) * nvg__signf(h);
+		float rxTR = nvg__minf(radTopRight, halfw) * nvg__signf(w), ryTR = nvg__minf(radTopRight, halfh) * nvg__signf(h);
+		float rxTL = nvg__minf(radTopLeft, halfw) * nvg__signf(w), ryTL = nvg__minf(radTopLeft, halfh) * nvg__signf(h);
+		float vals[] = {
+			NVG_MOVETO, x, y + ryTL,
+			NVG_LINETO, x, y + h - ryBL,
+			NVG_BEZIERTO, x, y + h - ryBL*(1 - NVG_KAPPA90), x + rxBL*(1 - NVG_KAPPA90), y + h, x + rxBL, y + h,
+			NVG_LINETO, x + w - rxBR, y + h,
+			NVG_BEZIERTO, x + w - rxBR*(1 - NVG_KAPPA90), y + h, x + w, y + h - ryBR*(1 - NVG_KAPPA90), x + w, y + h - ryBR,
+			NVG_LINETO, x + w, y + ryTR,
+			NVG_BEZIERTO, x + w, y + ryTR*(1 - NVG_KAPPA90), x + w - rxTR*(1 - NVG_KAPPA90), y, x + w - rxTR, y,
+			NVG_LINETO, x + rxTL, y,
+			NVG_BEZIERTO, x + rxTL*(1 - NVG_KAPPA90), y, x, y + ryTL*(1 - NVG_KAPPA90), x, y + ryTL,
+			NVG_CLOSE
+		};
+		nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+	}
+}
+
+void nvgEllipse(NVGcontext* ctx, float cx, float cy, float rx, float ry)
+{
+	float vals[] = {
+		NVG_MOVETO, cx-rx, cy,
+		NVG_BEZIERTO, cx-rx, cy+ry*NVG_KAPPA90, cx-rx*NVG_KAPPA90, cy+ry, cx, cy+ry,
+		NVG_BEZIERTO, cx+rx*NVG_KAPPA90, cy+ry, cx+rx, cy+ry*NVG_KAPPA90, cx+rx, cy,
+		NVG_BEZIERTO, cx+rx, cy-ry*NVG_KAPPA90, cx+rx*NVG_KAPPA90, cy-ry, cx, cy-ry,
+		NVG_BEZIERTO, cx-rx*NVG_KAPPA90, cy-ry, cx-rx, cy-ry*NVG_KAPPA90, cx-rx, cy,
+		NVG_CLOSE
+	};
+	nvg__appendCommands(ctx, vals, NVG_COUNTOF(vals));
+}
+
+void nvgCircle(NVGcontext* ctx, float cx, float cy, float r)
+{
+	nvgEllipse(ctx, cx,cy, r,r);
+}
+
+void nvgDebugDumpPathCache(NVGcontext* ctx)
+{
+	const NVGpath* path;
+	int i, j;
+
+	printf("Dumping %d cached paths\n", ctx->cache->npaths);
+	for (i = 0; i < ctx->cache->npaths; i++) {
+		path = &ctx->cache->paths[i];
+		printf(" - Path %d\n", i);
+		if (path->nfill) {
+			printf("   - fill: %d\n", path->nfill);
+			for (j = 0; j < path->nfill; j++)
+				printf("%f\t%f\n", path->fill[j].x, path->fill[j].y);
+		}
+		if (path->nstroke) {
+			printf("   - stroke: %d\n", path->nstroke);
+			for (j = 0; j < path->nstroke; j++)
+				printf("%f\t%f\n", path->stroke[j].x, path->stroke[j].y);
+		}
+	}
+}
+
+void nvgFill(NVGcontext* ctx)
+{
+	NVGstate* state = nvg__getState(ctx);
+	const NVGpath* path;
+	NVGpaint fillPaint = state->fill;
+	int i;
+
+	nvg__flattenPaths(ctx);
+	if (ctx->params.edgeAntiAlias && state->shapeAntiAlias)
+		nvg__expandFill(ctx, ctx->fringeWidth, NVG_MITER, 2.4f);
+	else
+		nvg__expandFill(ctx, 0.0f, NVG_MITER, 2.4f);
+
+	// Apply global alpha
+	fillPaint.innerColor.a *= state->alpha;
+	fillPaint.outerColor.a *= state->alpha;
+
+	ctx->params.renderFill(ctx->params.userPtr, &fillPaint, state->compositeOperation, &state->scissor, ctx->fringeWidth,
+						   ctx->cache->bounds, ctx->cache->paths, ctx->cache->npaths);
+
+	// Count triangles
+	for (i = 0; i < ctx->cache->npaths; i++) {
+		path = &ctx->cache->paths[i];
+		ctx->fillTriCount += path->nfill-2;
+		ctx->fillTriCount += path->nstroke-2;
+		ctx->drawCallCount += 2;
+	}
+}
+
+void nvgStroke(NVGcontext* ctx)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float scale = nvg__getAverageScale(state->xform);
+	float strokeWidth = nvg__clampf(state->strokeWidth * scale, 0.0f, 200.0f);
+	NVGpaint strokePaint = state->stroke;
+	const NVGpath* path;
+	int i;
+
+
+	if (strokeWidth < ctx->fringeWidth) {
+		// If the stroke width is less than pixel size, use alpha to emulate coverage.
+		// Since coverage is area, scale by alpha*alpha.
+		float alpha = nvg__clampf(strokeWidth / ctx->fringeWidth, 0.0f, 1.0f);
+		strokePaint.innerColor.a *= alpha*alpha;
+		strokePaint.outerColor.a *= alpha*alpha;
+		strokeWidth = ctx->fringeWidth;
+	}
+
+	// Apply global alpha
+	strokePaint.innerColor.a *= state->alpha;
+	strokePaint.outerColor.a *= state->alpha;
+
+	nvg__flattenPaths(ctx);
+
+	if (ctx->params.edgeAntiAlias && state->shapeAntiAlias)
+		nvg__expandStroke(ctx, strokeWidth*0.5f, ctx->fringeWidth, state->lineCap, state->lineJoin, state->miterLimit);
+	else
+		nvg__expandStroke(ctx, strokeWidth*0.5f, 0.0f, state->lineCap, state->lineJoin, state->miterLimit);
+
+	ctx->params.renderStroke(ctx->params.userPtr, &strokePaint, state->compositeOperation, &state->scissor, ctx->fringeWidth,
+							 strokeWidth, ctx->cache->paths, ctx->cache->npaths);
+
+	// Count triangles
+	for (i = 0; i < ctx->cache->npaths; i++) {
+		path = &ctx->cache->paths[i];
+		ctx->strokeTriCount += path->nstroke-2;
+		ctx->drawCallCount++;
+	}
+}
+
+// Add fonts
+int nvgCreateFont(NVGcontext* ctx, const char* name, const char* filename)
+{
+	return fonsAddFont(ctx->fs, name, filename, 0);
+}
+
+int nvgCreateFontAtIndex(NVGcontext* ctx, const char* name, const char* filename, const int fontIndex)
+{
+	return fonsAddFont(ctx->fs, name, filename, fontIndex);
+}
+
+int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData)
+{
+	return fonsAddFontMem(ctx->fs, name, data, ndata, freeData, 0);
+}
+
+int nvgCreateFontMemAtIndex(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData, const int fontIndex)
+{
+	return fonsAddFontMem(ctx->fs, name, data, ndata, freeData, fontIndex);
+}
+
+int nvgFindFont(NVGcontext* ctx, const char* name)
+{
+	if (name == NULL) return -1;
+	return fonsGetFontByName(ctx->fs, name);
+}
+
+
+int nvgAddFallbackFontId(NVGcontext* ctx, int baseFont, int fallbackFont)
+{
+	if(baseFont == -1 || fallbackFont == -1) return 0;
+	return fonsAddFallbackFont(ctx->fs, baseFont, fallbackFont);
+}
+
+int nvgAddFallbackFont(NVGcontext* ctx, const char* baseFont, const char* fallbackFont)
+{
+	return nvgAddFallbackFontId(ctx, nvgFindFont(ctx, baseFont), nvgFindFont(ctx, fallbackFont));
+}
+
+void nvgResetFallbackFontsId(NVGcontext* ctx, int baseFont)
+{
+	fonsResetFallbackFont(ctx->fs, baseFont);
+}
+
+void nvgResetFallbackFonts(NVGcontext* ctx, const char* baseFont)
+{
+	nvgResetFallbackFontsId(ctx, nvgFindFont(ctx, baseFont));
+}
+
+// State setting
+void nvgFontSize(NVGcontext* ctx, float size)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->fontSize = size;
+}
+
+void nvgFontBlur(NVGcontext* ctx, float blur)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->fontBlur = blur;
+}
+
+void nvgTextLetterSpacing(NVGcontext* ctx, float spacing)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->letterSpacing = spacing;
+}
+
+void nvgTextLineHeight(NVGcontext* ctx, float lineHeight)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->lineHeight = lineHeight;
+}
+
+void nvgTextAlign(NVGcontext* ctx, int align)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->textAlign = align;
+}
+
+void nvgFontFaceId(NVGcontext* ctx, int font)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->fontId = font;
+}
+
+void nvgFontFace(NVGcontext* ctx, const char* font)
+{
+	NVGstate* state = nvg__getState(ctx);
+	state->fontId = fonsGetFontByName(ctx->fs, font);
+}
+
+static float nvg__quantize(float a, float d)
+{
+	return ((int)(a / d + 0.5f)) * d;
+}
+
+static float nvg__getFontScale(NVGstate* state)
+{
+	return nvg__minf(nvg__quantize(nvg__getAverageScale(state->xform), 0.01f), 4.0f);
+}
+
+static void nvg__flushTextTexture(NVGcontext* ctx)
+{
+	int dirty[4];
+
+	if (fonsValidateTexture(ctx->fs, dirty)) {
+		int fontImage = ctx->fontImages[ctx->fontImageIdx];
+		// Update texture
+		if (fontImage != 0) {
+			int iw, ih;
+			const unsigned char* data = fonsGetTextureData(ctx->fs, &iw, &ih);
+			int x = dirty[0];
+			int y = dirty[1];
+			int w = dirty[2] - dirty[0];
+			int h = dirty[3] - dirty[1];
+			ctx->params.renderUpdateTexture(ctx->params.userPtr, fontImage, x,y, w,h, data);
+		}
+	}
+}
+
+static int nvg__allocTextAtlas(NVGcontext* ctx)
+{
+	int iw, ih;
+	nvg__flushTextTexture(ctx);
+	if (ctx->fontImageIdx >= NVG_MAX_FONTIMAGES-1)
+		return 0;
+	// if next fontImage already have a texture
+	if (ctx->fontImages[ctx->fontImageIdx+1] != 0)
+		nvgImageSize(ctx, ctx->fontImages[ctx->fontImageIdx+1], &iw, &ih);
+	else { // calculate the new font image size and create it.
+		nvgImageSize(ctx, ctx->fontImages[ctx->fontImageIdx], &iw, &ih);
+		if (iw > ih)
+			ih *= 2;
+		else
+			iw *= 2;
+		if (iw > NVG_MAX_FONTIMAGE_SIZE || ih > NVG_MAX_FONTIMAGE_SIZE)
+			iw = ih = NVG_MAX_FONTIMAGE_SIZE;
+		ctx->fontImages[ctx->fontImageIdx+1] = ctx->params.renderCreateTexture(ctx->params.userPtr, NVG_TEXTURE_ALPHA, iw, ih, 0, NULL);
+	}
+	++ctx->fontImageIdx;
+	fonsResetAtlas(ctx->fs, iw, ih);
+	return 1;
+}
+
+static void nvg__renderText(NVGcontext* ctx, NVGvertex* verts, int nverts)
+{
+	NVGstate* state = nvg__getState(ctx);
+	NVGpaint paint = state->fill;
+
+	// Render triangles.
+	paint.image = ctx->fontImages[ctx->fontImageIdx];
+
+	// Apply global alpha
+	paint.innerColor.a *= state->alpha;
+	paint.outerColor.a *= state->alpha;
+
+	ctx->params.renderTriangles(ctx->params.userPtr, &paint, state->compositeOperation, &state->scissor, verts, nverts, ctx->fringeWidth);
+
+	ctx->drawCallCount++;
+	ctx->textTriCount += nverts/3;
+}
+
+static int nvg__isTransformFlipped(const float *xform)
+{
+	float det = xform[0] * xform[3] - xform[2] * xform[1];
+	return( det < 0);
+}
+
+float nvgText(NVGcontext* ctx, float x, float y, const char* string, const char* end)
+{
+	NVGstate* state = nvg__getState(ctx);
+	FONStextIter iter, prevIter;
+	FONSquad q;
+	NVGvertex* verts;
+	float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+	float invscale = 1.0f / scale;
+	int cverts = 0;
+	int nverts = 0;
+	int isFlipped = nvg__isTransformFlipped(state->xform);
+
+	if (end == NULL)
+		end = string + strlen(string);
+
+	if (state->fontId == FONS_INVALID) return x;
+
+	fonsSetSize(ctx->fs, state->fontSize*scale);
+	fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+	fonsSetBlur(ctx->fs, state->fontBlur*scale);
+	fonsSetAlign(ctx->fs, state->textAlign);
+	fonsSetFont(ctx->fs, state->fontId);
+
+	cverts = nvg__maxi(2, (int)(end - string)) * 6; // conservative estimate.
+	verts = nvg__allocTempVerts(ctx, cverts);
+	if (verts == NULL) return x;
+
+	fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end, FONS_GLYPH_BITMAP_REQUIRED);
+	prevIter = iter;
+	while (fonsTextIterNext(ctx->fs, &iter, &q)) {
+		float c[4*2];
+		if (iter.prevGlyphIndex == -1) { // can not retrieve glyph?
+			if (nverts != 0) {
+				nvg__renderText(ctx, verts, nverts);
+				nverts = 0;
+			}
+			if (!nvg__allocTextAtlas(ctx))
+				break; // no memory :(
+			iter = prevIter;
+			fonsTextIterNext(ctx->fs, &iter, &q); // try again
+			if (iter.prevGlyphIndex == -1) // still can not find glyph?
+				break;
+		}
+		prevIter = iter;
+		if(isFlipped) {
+			float tmp;
+
+			tmp = q.y0; q.y0 = q.y1; q.y1 = tmp;
+			tmp = q.t0; q.t0 = q.t1; q.t1 = tmp;
+		}
+		// Transform corners.
+		nvgTransformPoint(&c[0],&c[1], state->xform, q.x0*invscale, q.y0*invscale);
+		nvgTransformPoint(&c[2],&c[3], state->xform, q.x1*invscale, q.y0*invscale);
+		nvgTransformPoint(&c[4],&c[5], state->xform, q.x1*invscale, q.y1*invscale);
+		nvgTransformPoint(&c[6],&c[7], state->xform, q.x0*invscale, q.y1*invscale);
+		// Create triangles
+		if (nverts+6 <= cverts) {
+			nvg__vset(&verts[nverts], c[0], c[1], q.s0, q.t0); nverts++;
+			nvg__vset(&verts[nverts], c[4], c[5], q.s1, q.t1); nverts++;
+			nvg__vset(&verts[nverts], c[2], c[3], q.s1, q.t0); nverts++;
+			nvg__vset(&verts[nverts], c[0], c[1], q.s0, q.t0); nverts++;
+			nvg__vset(&verts[nverts], c[6], c[7], q.s0, q.t1); nverts++;
+			nvg__vset(&verts[nverts], c[4], c[5], q.s1, q.t1); nverts++;
+		}
+	}
+
+	// TODO: add back-end bit to do this just once per frame.
+	nvg__flushTextTexture(ctx);
+
+	nvg__renderText(ctx, verts, nverts);
+
+	return iter.nextx / scale;
+}
+
+void nvgTextBox(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end)
+{
+	NVGstate* state = nvg__getState(ctx);
+	NVGtextRow rows[2];
+	int nrows = 0, i;
+	int oldAlign = state->textAlign;
+	int haling = state->textAlign & (NVG_ALIGN_LEFT | NVG_ALIGN_CENTER | NVG_ALIGN_RIGHT);
+	int valign = state->textAlign & (NVG_ALIGN_TOP | NVG_ALIGN_MIDDLE | NVG_ALIGN_BOTTOM | NVG_ALIGN_BASELINE);
+	float lineh = 0;
+
+	if (state->fontId == FONS_INVALID) return;
+
+	nvgTextMetrics(ctx, NULL, NULL, &lineh);
+
+	state->textAlign = NVG_ALIGN_LEFT | valign;
+
+	while ((nrows = nvgTextBreakLines(ctx, string, end, breakRowWidth, rows, 2))) {
+		for (i = 0; i < nrows; i++) {
+			NVGtextRow* row = &rows[i];
+			if (haling & NVG_ALIGN_LEFT)
+				nvgText(ctx, x, y, row->start, row->end);
+			else if (haling & NVG_ALIGN_CENTER)
+				nvgText(ctx, x + breakRowWidth*0.5f - row->width*0.5f, y, row->start, row->end);
+			else if (haling & NVG_ALIGN_RIGHT)
+				nvgText(ctx, x + breakRowWidth - row->width, y, row->start, row->end);
+			y += lineh * state->lineHeight;
+		}
+		string = rows[nrows-1].next;
+	}
+
+	state->textAlign = oldAlign;
+}
+
+int nvgTextGlyphPositions(NVGcontext* ctx, float x, float y, const char* string, const char* end, NVGglyphPosition* positions, int maxPositions)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+	float invscale = 1.0f / scale;
+	FONStextIter iter, prevIter;
+	FONSquad q;
+	int npos = 0;
+
+	if (state->fontId == FONS_INVALID) return 0;
+
+	if (end == NULL)
+		end = string + strlen(string);
+
+	if (string == end)
+		return 0;
+
+	fonsSetSize(ctx->fs, state->fontSize*scale);
+	fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+	fonsSetBlur(ctx->fs, state->fontBlur*scale);
+	fonsSetAlign(ctx->fs, state->textAlign);
+	fonsSetFont(ctx->fs, state->fontId);
+
+	fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end, FONS_GLYPH_BITMAP_OPTIONAL);
+	prevIter = iter;
+	while (fonsTextIterNext(ctx->fs, &iter, &q)) {
+		if (iter.prevGlyphIndex < 0 && nvg__allocTextAtlas(ctx)) { // can not retrieve glyph?
+			iter = prevIter;
+			fonsTextIterNext(ctx->fs, &iter, &q); // try again
+		}
+		prevIter = iter;
+		positions[npos].str = iter.str;
+		positions[npos].x = iter.x * invscale;
+		positions[npos].minx = nvg__minf(iter.x, q.x0) * invscale;
+		positions[npos].maxx = nvg__maxf(iter.nextx, q.x1) * invscale;
+		npos++;
+		if (npos >= maxPositions)
+			break;
+	}
+
+	return npos;
+}
+
+enum NVGcodepointType {
+	NVG_SPACE,
+	NVG_NEWLINE,
+	NVG_CHAR,
+	NVG_CJK_CHAR,
+};
+
+int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, NVGtextRow* rows, int maxRows)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+	float invscale = 1.0f / scale;
+	FONStextIter iter, prevIter;
+	FONSquad q;
+	int nrows = 0;
+	float rowStartX = 0;
+	float rowWidth = 0;
+	float rowMinX = 0;
+	float rowMaxX = 0;
+	const char* rowStart = NULL;
+	const char* rowEnd = NULL;
+	const char* wordStart = NULL;
+	float wordStartX = 0;
+	float wordMinX = 0;
+	const char* breakEnd = NULL;
+	float breakWidth = 0;
+	float breakMaxX = 0;
+	int type = NVG_SPACE, ptype = NVG_SPACE;
+	unsigned int pcodepoint = 0;
+
+	if (maxRows == 0) return 0;
+	if (state->fontId == FONS_INVALID) return 0;
+
+	if (end == NULL)
+		end = string + strlen(string);
+
+	if (string == end) return 0;
+
+	fonsSetSize(ctx->fs, state->fontSize*scale);
+	fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+	fonsSetBlur(ctx->fs, state->fontBlur*scale);
+	fonsSetAlign(ctx->fs, state->textAlign);
+	fonsSetFont(ctx->fs, state->fontId);
+
+	breakRowWidth *= scale;
+
+	fonsTextIterInit(ctx->fs, &iter, 0, 0, string, end, FONS_GLYPH_BITMAP_OPTIONAL);
+	prevIter = iter;
+	while (fonsTextIterNext(ctx->fs, &iter, &q)) {
+		if (iter.prevGlyphIndex < 0 && nvg__allocTextAtlas(ctx)) { // can not retrieve glyph?
+			iter = prevIter;
+			fonsTextIterNext(ctx->fs, &iter, &q); // try again
+		}
+		prevIter = iter;
+		switch (iter.codepoint) {
+			case 9:			// \t
+			case 11:		// \v
+			case 12:		// \f
+			case 32:		// space
+			case 0x00a0:	// NBSP
+				type = NVG_SPACE;
+				break;
+			case 10:		// \n
+				type = pcodepoint == 13 ? NVG_SPACE : NVG_NEWLINE;
+				break;
+			case 13:		// \r
+				type = pcodepoint == 10 ? NVG_SPACE : NVG_NEWLINE;
+				break;
+			case 0x0085:	// NEL
+				type = NVG_NEWLINE;
+				break;
+			default:
+				if ((iter.codepoint >= 0x4E00 && iter.codepoint <= 0x9FFF) ||
+					(iter.codepoint >= 0x3000 && iter.codepoint <= 0x30FF) ||
+					(iter.codepoint >= 0xFF00 && iter.codepoint <= 0xFFEF) ||
+					(iter.codepoint >= 0x1100 && iter.codepoint <= 0x11FF) ||
+					(iter.codepoint >= 0x3130 && iter.codepoint <= 0x318F) ||
+					(iter.codepoint >= 0xAC00 && iter.codepoint <= 0xD7AF))
+					type = NVG_CJK_CHAR;
+				else
+					type = NVG_CHAR;
+				break;
+		}
+
+		if (type == NVG_NEWLINE) {
+			// Always handle new lines.
+			rows[nrows].start = rowStart != NULL ? rowStart : iter.str;
+			rows[nrows].end = rowEnd != NULL ? rowEnd : iter.str;
+			rows[nrows].width = rowWidth * invscale;
+			rows[nrows].minx = rowMinX * invscale;
+			rows[nrows].maxx = rowMaxX * invscale;
+			rows[nrows].next = iter.next;
+			nrows++;
+			if (nrows >= maxRows)
+				return nrows;
+			// Set null break point
+			breakEnd = rowStart;
+			breakWidth = 0.0;
+			breakMaxX = 0.0;
+			// Indicate to skip the white space at the beginning of the row.
+			rowStart = NULL;
+			rowEnd = NULL;
+			rowWidth = 0;
+			rowMinX = rowMaxX = 0;
+		} else {
+			if (rowStart == NULL) {
+				// Skip white space until the beginning of the line
+				if (type == NVG_CHAR || type == NVG_CJK_CHAR) {
+					// The current char is the row so far
+					rowStartX = iter.x;
+					rowStart = iter.str;
+					rowEnd = iter.next;
+					rowWidth = iter.nextx - rowStartX;
+					rowMinX = q.x0 - rowStartX;
+					rowMaxX = q.x1 - rowStartX;
+					wordStart = iter.str;
+					wordStartX = iter.x;
+					wordMinX = q.x0 - rowStartX;
+					// Set null break point
+					breakEnd = rowStart;
+					breakWidth = 0.0;
+					breakMaxX = 0.0;
+				}
+			} else {
+				float nextWidth = iter.nextx - rowStartX;
+
+				// track last non-white space character
+				if (type == NVG_CHAR || type == NVG_CJK_CHAR) {
+					rowEnd = iter.next;
+					rowWidth = iter.nextx - rowStartX;
+					rowMaxX = q.x1 - rowStartX;
+				}
+				// track last end of a word
+				if (((ptype == NVG_CHAR || ptype == NVG_CJK_CHAR) && type == NVG_SPACE) || type == NVG_CJK_CHAR) {
+					breakEnd = iter.str;
+					breakWidth = rowWidth;
+					breakMaxX = rowMaxX;
+				}
+				// track last beginning of a word
+				if ((ptype == NVG_SPACE && (type == NVG_CHAR || type == NVG_CJK_CHAR)) || type == NVG_CJK_CHAR) {
+					wordStart = iter.str;
+					wordStartX = iter.x;
+					wordMinX = q.x0;
+				}
+
+				// Break to new line when a character is beyond break width.
+				if ((type == NVG_CHAR || type == NVG_CJK_CHAR) && nextWidth > breakRowWidth) {
+					// The run length is too long, need to break to new line.
+					if (breakEnd == rowStart) {
+						// The current word is longer than the row length, just break it from here.
+						rows[nrows].start = rowStart;
+						rows[nrows].end = iter.str;
+						rows[nrows].width = rowWidth * invscale;
+						rows[nrows].minx = rowMinX * invscale;
+						rows[nrows].maxx = rowMaxX * invscale;
+						rows[nrows].next = iter.str;
+						nrows++;
+						if (nrows >= maxRows)
+							return nrows;
+						rowStartX = iter.x;
+						rowStart = iter.str;
+						rowEnd = iter.next;
+						rowWidth = iter.nextx - rowStartX;
+						rowMinX = q.x0 - rowStartX;
+						rowMaxX = q.x1 - rowStartX;
+						wordStart = iter.str;
+						wordStartX = iter.x;
+						wordMinX = q.x0 - rowStartX;
+					} else {
+						// Break the line from the end of the last word, and start new line from the beginning of the new.
+						rows[nrows].start = rowStart;
+						rows[nrows].end = breakEnd;
+						rows[nrows].width = breakWidth * invscale;
+						rows[nrows].minx = rowMinX * invscale;
+						rows[nrows].maxx = breakMaxX * invscale;
+						rows[nrows].next = wordStart;
+						nrows++;
+						if (nrows >= maxRows)
+							return nrows;
+						// Update row
+						rowStartX = wordStartX;
+						rowStart = wordStart;
+						rowEnd = iter.next;
+						rowWidth = iter.nextx - rowStartX;
+						rowMinX = wordMinX - rowStartX;
+						rowMaxX = q.x1 - rowStartX;
+					}
+					// Set null break point
+					breakEnd = rowStart;
+					breakWidth = 0.0;
+					breakMaxX = 0.0;
+				}
+			}
+		}
+
+		pcodepoint = iter.codepoint;
+		ptype = type;
+	}
+
+	// Break the line from the end of the last word, and start new line from the beginning of the new.
+	if (rowStart != NULL) {
+		rows[nrows].start = rowStart;
+		rows[nrows].end = rowEnd;
+		rows[nrows].width = rowWidth * invscale;
+		rows[nrows].minx = rowMinX * invscale;
+		rows[nrows].maxx = rowMaxX * invscale;
+		rows[nrows].next = end;
+		nrows++;
+	}
+
+	return nrows;
+}
+
+float nvgTextBounds(NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+	float invscale = 1.0f / scale;
+	float width;
+
+	if (state->fontId == FONS_INVALID) return 0;
+
+	fonsSetSize(ctx->fs, state->fontSize*scale);
+	fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+	fonsSetBlur(ctx->fs, state->fontBlur*scale);
+	fonsSetAlign(ctx->fs, state->textAlign);
+	fonsSetFont(ctx->fs, state->fontId);
+
+	width = fonsTextBounds(ctx->fs, x*scale, y*scale, string, end, bounds);
+	if (bounds != NULL) {
+		// Use line bounds for height.
+		fonsLineBounds(ctx->fs, y*scale, &bounds[1], &bounds[3]);
+		bounds[0] *= invscale;
+		bounds[1] *= invscale;
+		bounds[2] *= invscale;
+		bounds[3] *= invscale;
+	}
+	return width * invscale;
+}
+
+void nvgTextBoxBounds(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds)
+{
+	NVGstate* state = nvg__getState(ctx);
+	NVGtextRow rows[2];
+	float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+	float invscale = 1.0f / scale;
+	int nrows = 0, i;
+	int oldAlign = state->textAlign;
+	int haling = state->textAlign & (NVG_ALIGN_LEFT | NVG_ALIGN_CENTER | NVG_ALIGN_RIGHT);
+	int valign = state->textAlign & (NVG_ALIGN_TOP | NVG_ALIGN_MIDDLE | NVG_ALIGN_BOTTOM | NVG_ALIGN_BASELINE);
+	float lineh = 0, rminy = 0, rmaxy = 0;
+	float minx, miny, maxx, maxy;
+
+	if (state->fontId == FONS_INVALID) {
+		if (bounds != NULL)
+			bounds[0] = bounds[1] = bounds[2] = bounds[3] = 0.0f;
+		return;
+	}
+
+	nvgTextMetrics(ctx, NULL, NULL, &lineh);
+
+	state->textAlign = NVG_ALIGN_LEFT | valign;
+
+	minx = maxx = x;
+	miny = maxy = y;
+
+	fonsSetSize(ctx->fs, state->fontSize*scale);
+	fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+	fonsSetBlur(ctx->fs, state->fontBlur*scale);
+	fonsSetAlign(ctx->fs, state->textAlign);
+	fonsSetFont(ctx->fs, state->fontId);
+	fonsLineBounds(ctx->fs, 0, &rminy, &rmaxy);
+	rminy *= invscale;
+	rmaxy *= invscale;
+
+	while ((nrows = nvgTextBreakLines(ctx, string, end, breakRowWidth, rows, 2))) {
+		for (i = 0; i < nrows; i++) {
+			NVGtextRow* row = &rows[i];
+			float rminx, rmaxx, dx = 0;
+			// Horizontal bounds
+			if (haling & NVG_ALIGN_LEFT)
+				dx = 0;
+			else if (haling & NVG_ALIGN_CENTER)
+				dx = breakRowWidth*0.5f - row->width*0.5f;
+			else if (haling & NVG_ALIGN_RIGHT)
+				dx = breakRowWidth - row->width;
+			rminx = x + row->minx + dx;
+			rmaxx = x + row->maxx + dx;
+			minx = nvg__minf(minx, rminx);
+			maxx = nvg__maxf(maxx, rmaxx);
+			// Vertical bounds.
+			miny = nvg__minf(miny, y + rminy);
+			maxy = nvg__maxf(maxy, y + rmaxy);
+
+			y += lineh * state->lineHeight;
+		}
+		string = rows[nrows-1].next;
+	}
+
+	state->textAlign = oldAlign;
+
+	if (bounds != NULL) {
+		bounds[0] = minx;
+		bounds[1] = miny;
+		bounds[2] = maxx;
+		bounds[3] = maxy;
+	}
+}
+
+void nvgTextMetrics(NVGcontext* ctx, float* ascender, float* descender, float* lineh)
+{
+	NVGstate* state = nvg__getState(ctx);
+	float scale = nvg__getFontScale(state) * ctx->devicePxRatio;
+	float invscale = 1.0f / scale;
+
+	if (state->fontId == FONS_INVALID) return;
+
+	fonsSetSize(ctx->fs, state->fontSize*scale);
+	fonsSetSpacing(ctx->fs, state->letterSpacing*scale);
+	fonsSetBlur(ctx->fs, state->fontBlur*scale);
+	fonsSetAlign(ctx->fs, state->textAlign);
+	fonsSetFont(ctx->fs, state->fontId);
+
+	fonsVertMetrics(ctx->fs, ascender, descender, lineh);
+	if (ascender != NULL)
+		*ascender *= invscale;
+	if (descender != NULL)
+		*descender *= invscale;
+	if (lineh != NULL)
+		*lineh *= invscale;
+}
+// vim: ft=c nu noet ts=4

nanovg/nanovg.h

@@ -0,0 +1,697 @@
+//
+// Copyright (c) 2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+
+#ifndef NANOVG_H
+#define NANOVG_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#define NVG_PI 3.14159265358979323846264338327f
+
+#ifdef _MSC_VER
+#pragma warning(push)
+#pragma warning(disable: 4201)  // nonstandard extension used : nameless struct/union
+#endif
+
+typedef struct NVGcontext NVGcontext;
+
+struct NVGcolor {
+	union {
+		float rgba[4];
+		struct {
+			float r,g,b,a;
+		};
+	};
+};
+typedef struct NVGcolor NVGcolor;
+
+struct NVGpaint {
+	float xform[6];
+	float extent[2];
+	float radius;
+	float feather;
+	NVGcolor innerColor;
+	NVGcolor outerColor;
+	int image;
+};
+typedef struct NVGpaint NVGpaint;
+
+enum NVGwinding {
+	NVG_CCW = 1,			// Winding for solid shapes
+	NVG_CW = 2,				// Winding for holes
+};
+
+enum NVGsolidity {
+	NVG_SOLID = 1,			// CCW
+	NVG_HOLE = 2,			// CW
+};
+
+enum NVGlineCap {
+	NVG_BUTT,
+	NVG_ROUND,
+	NVG_SQUARE,
+	NVG_BEVEL,
+	NVG_MITER,
+};
+
+enum NVGalign {
+	// Horizontal align
+	NVG_ALIGN_LEFT 		= 1<<0,	// Default, align text horizontally to left.
+	NVG_ALIGN_CENTER 	= 1<<1,	// Align text horizontally to center.
+	NVG_ALIGN_RIGHT 	= 1<<2,	// Align text horizontally to right.
+	// Vertical align
+	NVG_ALIGN_TOP 		= 1<<3,	// Align text vertically to top.
+	NVG_ALIGN_MIDDLE	= 1<<4,	// Align text vertically to middle.
+	NVG_ALIGN_BOTTOM	= 1<<5,	// Align text vertically to bottom.
+	NVG_ALIGN_BASELINE	= 1<<6, // Default, align text vertically to baseline.
+};
+
+enum NVGblendFactor {
+	NVG_ZERO = 1<<0,
+	NVG_ONE = 1<<1,
+	NVG_SRC_COLOR = 1<<2,
+	NVG_ONE_MINUS_SRC_COLOR = 1<<3,
+	NVG_DST_COLOR = 1<<4,
+	NVG_ONE_MINUS_DST_COLOR = 1<<5,
+	NVG_SRC_ALPHA = 1<<6,
+	NVG_ONE_MINUS_SRC_ALPHA = 1<<7,
+	NVG_DST_ALPHA = 1<<8,
+	NVG_ONE_MINUS_DST_ALPHA = 1<<9,
+	NVG_SRC_ALPHA_SATURATE = 1<<10,
+};
+
+enum NVGcompositeOperation {
+	NVG_SOURCE_OVER,
+	NVG_SOURCE_IN,
+	NVG_SOURCE_OUT,
+	NVG_ATOP,
+	NVG_DESTINATION_OVER,
+	NVG_DESTINATION_IN,
+	NVG_DESTINATION_OUT,
+	NVG_DESTINATION_ATOP,
+	NVG_LIGHTER,
+	NVG_COPY,
+	NVG_XOR,
+};
+
+struct NVGcompositeOperationState {
+	int srcRGB;
+	int dstRGB;
+	int srcAlpha;
+	int dstAlpha;
+};
+typedef struct NVGcompositeOperationState NVGcompositeOperationState;
+
+struct NVGglyphPosition {
+	const char* str;	// Position of the glyph in the input string.
+	float x;			// The x-coordinate of the logical glyph position.
+	float minx, maxx;	// The bounds of the glyph shape.
+};
+typedef struct NVGglyphPosition NVGglyphPosition;
+
+struct NVGtextRow {
+	const char* start;	// Pointer to the input text where the row starts.
+	const char* end;	// Pointer to the input text where the row ends (one past the last character).
+	const char* next;	// Pointer to the beginning of the next row.
+	float width;		// Logical width of the row.
+	float minx, maxx;	// Actual bounds of the row. Logical with and bounds can differ because of kerning and some parts over extending.
+};
+typedef struct NVGtextRow NVGtextRow;
+
+enum NVGimageFlags {
+    NVG_IMAGE_GENERATE_MIPMAPS	= 1<<0,     // Generate mipmaps during creation of the image.
+	NVG_IMAGE_REPEATX			= 1<<1,		// Repeat image in X direction.
+	NVG_IMAGE_REPEATY			= 1<<2,		// Repeat image in Y direction.
+	NVG_IMAGE_FLIPY				= 1<<3,		// Flips (inverses) image in Y direction when rendered.
+	NVG_IMAGE_PREMULTIPLIED		= 1<<4,		// Image data has premultiplied alpha.
+	NVG_IMAGE_NEAREST			= 1<<5,		// Image interpolation is Nearest instead Linear
+};
+
+// Begin drawing a new frame
+// Calls to nanovg drawing API should be wrapped in nvgBeginFrame() & nvgEndFrame()
+// nvgBeginFrame() defines the size of the window to render to in relation currently
+// set viewport (i.e. glViewport on GL backends). Device pixel ration allows to
+// control the rendering on Hi-DPI devices.
+// For example, GLFW returns two dimension for an opened window: window size and
+// frame buffer size. In that case you would set windowWidth/Height to the window size
+// devicePixelRatio to: frameBufferWidth / windowWidth.
+void nvgBeginFrame(NVGcontext* ctx, float windowWidth, float windowHeight, float devicePixelRatio);
+
+// Cancels drawing the current frame.
+void nvgCancelFrame(NVGcontext* ctx);
+
+// Ends drawing flushing remaining render state.
+void nvgEndFrame(NVGcontext* ctx);
+
+//
+// Composite operation
+//
+// The composite operations in NanoVG are modeled after HTML Canvas API, and
+// the blend func is based on OpenGL (see corresponding manuals for more info).
+// The colors in the blending state have premultiplied alpha.
+
+// Sets the composite operation. The op parameter should be one of NVGcompositeOperation.
+void nvgGlobalCompositeOperation(NVGcontext* ctx, int op);
+
+// Sets the composite operation with custom pixel arithmetic. The parameters should be one of NVGblendFactor.
+void nvgGlobalCompositeBlendFunc(NVGcontext* ctx, int sfactor, int dfactor);
+
+// Sets the composite operation with custom pixel arithmetic for RGB and alpha components separately. The parameters should be one of NVGblendFactor.
+void nvgGlobalCompositeBlendFuncSeparate(NVGcontext* ctx, int srcRGB, int dstRGB, int srcAlpha, int dstAlpha);
+
+//
+// Color utils
+//
+// Colors in NanoVG are stored as unsigned ints in ABGR format.
+
+// Returns a color value from red, green, blue values. Alpha will be set to 255 (1.0f).
+NVGcolor nvgRGB(unsigned char r, unsigned char g, unsigned char b);
+
+// Returns a color value from red, green, blue values. Alpha will be set to 1.0f.
+NVGcolor nvgRGBf(float r, float g, float b);
+
+
+// Returns a color value from red, green, blue and alpha values.
+NVGcolor nvgRGBA(unsigned char r, unsigned char g, unsigned char b, unsigned char a);
+
+// Returns a color value from red, green, blue and alpha values.
+NVGcolor nvgRGBAf(float r, float g, float b, float a);
+
+
+// Linearly interpolates from color c0 to c1, and returns resulting color value.
+NVGcolor nvgLerpRGBA(NVGcolor c0, NVGcolor c1, float u);
+
+// Sets transparency of a color value.
+NVGcolor nvgTransRGBA(NVGcolor c0, unsigned char a);
+
+// Sets transparency of a color value.
+NVGcolor nvgTransRGBAf(NVGcolor c0, float a);
+
+// Returns color value specified by hue, saturation and lightness.
+// HSL values are all in range [0..1], alpha will be set to 255.
+NVGcolor nvgHSL(float h, float s, float l);
+
+// Returns color value specified by hue, saturation and lightness and alpha.
+// HSL values are all in range [0..1], alpha in range [0..255]
+NVGcolor nvgHSLA(float h, float s, float l, unsigned char a);
+
+//
+// State Handling
+//
+// NanoVG contains state which represents how paths will be rendered.
+// The state contains transform, fill and stroke styles, text and font styles,
+// and scissor clipping.
+
+// Pushes and saves the current render state into a state stack.
+// A matching nvgRestore() must be used to restore the state.
+void nvgSave(NVGcontext* ctx);
+
+// Pops and restores current render state.
+void nvgRestore(NVGcontext* ctx);
+
+// Resets current render state to default values. Does not affect the render state stack.
+void nvgReset(NVGcontext* ctx);
+
+//
+// Render styles
+//
+// Fill and stroke render style can be either a solid color or a paint which is a gradient or a pattern.
+// Solid color is simply defined as a color value, different kinds of paints can be created
+// using nvgLinearGradient(), nvgBoxGradient(), nvgRadialGradient() and nvgImagePattern().
+//
+// Current render style can be saved and restored using nvgSave() and nvgRestore().
+
+// Sets whether to draw antialias for nvgStroke() and nvgFill(). It's enabled by default.
+void nvgShapeAntiAlias(NVGcontext* ctx, int enabled);
+
+// Sets current stroke style to a solid color.
+void nvgStrokeColor(NVGcontext* ctx, NVGcolor color);
+
+// Sets current stroke style to a paint, which can be a one of the gradients or a pattern.
+void nvgStrokePaint(NVGcontext* ctx, NVGpaint paint);
+
+// Sets current fill style to a solid color.
+void nvgFillColor(NVGcontext* ctx, NVGcolor color);
+
+// Sets current fill style to a paint, which can be a one of the gradients or a pattern.
+void nvgFillPaint(NVGcontext* ctx, NVGpaint paint);
+
+// Sets the miter limit of the stroke style.
+// Miter limit controls when a sharp corner is beveled.
+void nvgMiterLimit(NVGcontext* ctx, float limit);
+
+// Sets the stroke width of the stroke style.
+void nvgStrokeWidth(NVGcontext* ctx, float size);
+
+// Sets how the end of the line (cap) is drawn,
+// Can be one of: NVG_BUTT (default), NVG_ROUND, NVG_SQUARE.
+void nvgLineCap(NVGcontext* ctx, int cap);
+
+// Sets how sharp path corners are drawn.
+// Can be one of NVG_MITER (default), NVG_ROUND, NVG_BEVEL.
+void nvgLineJoin(NVGcontext* ctx, int join);
+
+// Sets the transparency applied to all rendered shapes.
+// Already transparent paths will get proportionally more transparent as well.
+void nvgGlobalAlpha(NVGcontext* ctx, float alpha);
+
+//
+// Transforms
+//
+// The paths, gradients, patterns and scissor region are transformed by an transformation
+// matrix at the time when they are passed to the API.
+// The current transformation matrix is a affine matrix:
+//   [sx kx tx]
+//   [ky sy ty]
+//   [ 0  0  1]
+// Where: sx,sy define scaling, kx,ky skewing, and tx,ty translation.
+// The last row is assumed to be 0,0,1 and is not stored.
+//
+// Apart from nvgResetTransform(), each transformation function first creates
+// specific transformation matrix and pre-multiplies the current transformation by it.
+//
+// Current coordinate system (transformation) can be saved and restored using nvgSave() and nvgRestore().
+
+// Resets current transform to a identity matrix.
+void nvgResetTransform(NVGcontext* ctx);
+
+// Premultiplies current coordinate system by specified matrix.
+// The parameters are interpreted as matrix as follows:
+//   [a c e]
+//   [b d f]
+//   [0 0 1]
+void nvgTransform(NVGcontext* ctx, float a, float b, float c, float d, float e, float f);
+
+// Translates current coordinate system.
+void nvgTranslate(NVGcontext* ctx, float x, float y);
+
+// Rotates current coordinate system. Angle is specified in radians.
+void nvgRotate(NVGcontext* ctx, float angle);
+
+// Skews the current coordinate system along X axis. Angle is specified in radians.
+void nvgSkewX(NVGcontext* ctx, float angle);
+
+// Skews the current coordinate system along Y axis. Angle is specified in radians.
+void nvgSkewY(NVGcontext* ctx, float angle);
+
+// Scales the current coordinate system.
+void nvgScale(NVGcontext* ctx, float x, float y);
+
+// Stores the top part (a-f) of the current transformation matrix in to the specified buffer.
+//   [a c e]
+//   [b d f]
+//   [0 0 1]
+// There should be space for 6 floats in the return buffer for the values a-f.
+void nvgCurrentTransform(NVGcontext* ctx, float* xform);
+
+
+// The following functions can be used to make calculations on 2x3 transformation matrices.
+// A 2x3 matrix is represented as float[6].
+
+// Sets the transform to identity matrix.
+void nvgTransformIdentity(float* dst);
+
+// Sets the transform to translation matrix matrix.
+void nvgTransformTranslate(float* dst, float tx, float ty);
+
+// Sets the transform to scale matrix.
+void nvgTransformScale(float* dst, float sx, float sy);
+
+// Sets the transform to rotate matrix. Angle is specified in radians.
+void nvgTransformRotate(float* dst, float a);
+
+// Sets the transform to skew-x matrix. Angle is specified in radians.
+void nvgTransformSkewX(float* dst, float a);
+
+// Sets the transform to skew-y matrix. Angle is specified in radians.
+void nvgTransformSkewY(float* dst, float a);
+
+// Sets the transform to the result of multiplication of two transforms, of A = A*B.
+void nvgTransformMultiply(float* dst, const float* src);
+
+// Sets the transform to the result of multiplication of two transforms, of A = B*A.
+void nvgTransformPremultiply(float* dst, const float* src);
+
+// Sets the destination to inverse of specified transform.
+// Returns 1 if the inverse could be calculated, else 0.
+int nvgTransformInverse(float* dst, const float* src);
+
+// Transform a point by given transform.
+void nvgTransformPoint(float* dstx, float* dsty, const float* xform, float srcx, float srcy);
+
+// Converts degrees to radians and vice versa.
+float nvgDegToRad(float deg);
+float nvgRadToDeg(float rad);
+
+//
+// Images
+//
+// NanoVG allows you to load jpg, png, psd, tga, pic and gif files to be used for rendering.
+// In addition you can upload your own image. The image loading is provided by stb_image.
+// The parameter imageFlags is combination of flags defined in NVGimageFlags.
+
+// Creates image by loading it from the disk from specified file name.
+// Returns handle to the image.
+int nvgCreateImage(NVGcontext* ctx, const char* filename, int imageFlags);
+
+// Creates image by loading it from the specified chunk of memory.
+// Returns handle to the image.
+int nvgCreateImageMem(NVGcontext* ctx, int imageFlags, unsigned char* data, int ndata);
+
+// Creates image from specified image data.
+// Returns handle to the image.
+int nvgCreateImageRGBA(NVGcontext* ctx, int w, int h, int imageFlags, const unsigned char* data);
+
+// Updates image data specified by image handle.
+void nvgUpdateImage(NVGcontext* ctx, int image, const unsigned char* data);
+
+// Returns the dimensions of a created image.
+void nvgImageSize(NVGcontext* ctx, int image, int* w, int* h);
+
+// Deletes created image.
+void nvgDeleteImage(NVGcontext* ctx, int image);
+
+//
+// Paints
+//
+// NanoVG supports four types of paints: linear gradient, box gradient, radial gradient and image pattern.
+// These can be used as paints for strokes and fills.
+
+// Creates and returns a linear gradient. Parameters (sx,sy)-(ex,ey) specify the start and end coordinates
+// of the linear gradient, icol specifies the start color and ocol the end color.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+NVGpaint nvgLinearGradient(NVGcontext* ctx, float sx, float sy, float ex, float ey,
+						   NVGcolor icol, NVGcolor ocol);
+
+// Creates and returns a box gradient. Box gradient is a feathered rounded rectangle, it is useful for rendering
+// drop shadows or highlights for boxes. Parameters (x,y) define the top-left corner of the rectangle,
+// (w,h) define the size of the rectangle, r defines the corner radius, and f feather. Feather defines how blurry
+// the border of the rectangle is. Parameter icol specifies the inner color and ocol the outer color of the gradient.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+NVGpaint nvgBoxGradient(NVGcontext* ctx, float x, float y, float w, float h,
+						float r, float f, NVGcolor icol, NVGcolor ocol);
+
+// Creates and returns a radial gradient. Parameters (cx,cy) specify the center, inr and outr specify
+// the inner and outer radius of the gradient, icol specifies the start color and ocol the end color.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+NVGpaint nvgRadialGradient(NVGcontext* ctx, float cx, float cy, float inr, float outr,
+						   NVGcolor icol, NVGcolor ocol);
+
+// Creates and returns an image pattern. Parameters (ox,oy) specify the left-top location of the image pattern,
+// (ex,ey) the size of one image, angle rotation around the top-left corner, image is handle to the image to render.
+// The gradient is transformed by the current transform when it is passed to nvgFillPaint() or nvgStrokePaint().
+NVGpaint nvgImagePattern(NVGcontext* ctx, float ox, float oy, float ex, float ey,
+						 float angle, int image, float alpha);
+
+//
+// Scissoring
+//
+// Scissoring allows you to clip the rendering into a rectangle. This is useful for various
+// user interface cases like rendering a text edit or a timeline.
+
+// Sets the current scissor rectangle.
+// The scissor rectangle is transformed by the current transform.
+void nvgScissor(NVGcontext* ctx, float x, float y, float w, float h);
+
+// Intersects current scissor rectangle with the specified rectangle.
+// The scissor rectangle is transformed by the current transform.
+// Note: in case the rotation of previous scissor rect differs from
+// the current one, the intersection will be done between the specified
+// rectangle and the previous scissor rectangle transformed in the current
+// transform space. The resulting shape is always rectangle.
+void nvgIntersectScissor(NVGcontext* ctx, float x, float y, float w, float h);
+
+// Reset and disables scissoring.
+void nvgResetScissor(NVGcontext* ctx);
+
+//
+// Paths
+//
+// Drawing a new shape starts with nvgBeginPath(), it clears all the currently defined paths.
+// Then you define one or more paths and sub-paths which describe the shape. The are functions
+// to draw common shapes like rectangles and circles, and lower level step-by-step functions,
+// which allow to define a path curve by curve.
+//
+// NanoVG uses even-odd fill rule to draw the shapes. Solid shapes should have counter clockwise
+// winding and holes should have counter clockwise order. To specify winding of a path you can
+// call nvgPathWinding(). This is useful especially for the common shapes, which are drawn CCW.
+//
+// Finally you can fill the path using current fill style by calling nvgFill(), and stroke it
+// with current stroke style by calling nvgStroke().
+//
+// The curve segments and sub-paths are transformed by the current transform.
+
+// Clears the current path and sub-paths.
+void nvgBeginPath(NVGcontext* ctx);
+
+// Starts new sub-path with specified point as first point.
+void nvgMoveTo(NVGcontext* ctx, float x, float y);
+
+// Adds line segment from the last point in the path to the specified point.
+void nvgLineTo(NVGcontext* ctx, float x, float y);
+
+// Adds cubic bezier segment from last point in the path via two control points to the specified point.
+void nvgBezierTo(NVGcontext* ctx, float c1x, float c1y, float c2x, float c2y, float x, float y);
+
+// Adds quadratic bezier segment from last point in the path via a control point to the specified point.
+void nvgQuadTo(NVGcontext* ctx, float cx, float cy, float x, float y);
+
+// Adds an arc segment at the corner defined by the last path point, and two specified points.
+void nvgArcTo(NVGcontext* ctx, float x1, float y1, float x2, float y2, float radius);
+
+// Closes current sub-path with a line segment.
+void nvgClosePath(NVGcontext* ctx);
+
+// Sets the current sub-path winding, see NVGwinding and NVGsolidity.
+void nvgPathWinding(NVGcontext* ctx, int dir);
+
+// Creates new circle arc shaped sub-path. The arc center is at cx,cy, the arc radius is r,
+// and the arc is drawn from angle a0 to a1, and swept in direction dir (NVG_CCW, or NVG_CW).
+// Angles are specified in radians.
+void nvgArc(NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, int dir);
+
+// Creates new rectangle shaped sub-path.
+void nvgRect(NVGcontext* ctx, float x, float y, float w, float h);
+
+// Creates new rounded rectangle shaped sub-path.
+void nvgRoundedRect(NVGcontext* ctx, float x, float y, float w, float h, float r);
+
+// Creates new rounded rectangle shaped sub-path with varying radii for each corner.
+void nvgRoundedRectVarying(NVGcontext* ctx, float x, float y, float w, float h, float radTopLeft, float radTopRight, float radBottomRight, float radBottomLeft);
+
+// Creates new ellipse shaped sub-path.
+void nvgEllipse(NVGcontext* ctx, float cx, float cy, float rx, float ry);
+
+// Creates new circle shaped sub-path.
+void nvgCircle(NVGcontext* ctx, float cx, float cy, float r);
+
+// Fills the current path with current fill style.
+void nvgFill(NVGcontext* ctx);
+
+// Fills the current path with current stroke style.
+void nvgStroke(NVGcontext* ctx);
+
+
+//
+// Text
+//
+// NanoVG allows you to load .ttf files and use the font to render text.
+//
+// The appearance of the text can be defined by setting the current text style
+// and by specifying the fill color. Common text and font settings such as
+// font size, letter spacing and text align are supported. Font blur allows you
+// to create simple text effects such as drop shadows.
+//
+// At render time the font face can be set based on the font handles or name.
+//
+// Font measure functions return values in local space, the calculations are
+// carried in the same resolution as the final rendering. This is done because
+// the text glyph positions are snapped to the nearest pixels sharp rendering.
+//
+// The local space means that values are not rotated or scale as per the current
+// transformation. For example if you set font size to 12, which would mean that
+// line height is 16, then regardless of the current scaling and rotation, the
+// returned line height is always 16. Some measures may vary because of the scaling
+// since aforementioned pixel snapping.
+//
+// While this may sound a little odd, the setup allows you to always render the
+// same way regardless of scaling. I.e. following works regardless of scaling:
+//
+//		const char* txt = "Text me up.";
+//		nvgTextBounds(vg, x,y, txt, NULL, bounds);
+//		nvgBeginPath(vg);
+//		nvgRoundedRect(vg, bounds[0],bounds[1], bounds[2]-bounds[0], bounds[3]-bounds[1]);
+//		nvgFill(vg);
+//
+// Note: currently only solid color fill is supported for text.
+
+// Creates font by loading it from the disk from specified file name.
+// Returns handle to the font.
+int nvgCreateFont(NVGcontext* ctx, const char* name, const char* filename);
+
+// fontIndex specifies which font face to load from a .ttf/.ttc file.
+int nvgCreateFontAtIndex(NVGcontext* ctx, const char* name, const char* filename, const int fontIndex);
+
+// Creates font by loading it from the specified memory chunk.
+// Returns handle to the font.
+int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData);
+
+// fontIndex specifies which font face to load from a .ttf/.ttc file.
+int nvgCreateFontMemAtIndex(NVGcontext* ctx, const char* name, unsigned char* data, int ndata, int freeData, const int fontIndex);
+
+// Finds a loaded font of specified name, and returns handle to it, or -1 if the font is not found.
+int nvgFindFont(NVGcontext* ctx, const char* name);
+
+// Adds a fallback font by handle.
+int nvgAddFallbackFontId(NVGcontext* ctx, int baseFont, int fallbackFont);
+
+// Adds a fallback font by name.
+int nvgAddFallbackFont(NVGcontext* ctx, const char* baseFont, const char* fallbackFont);
+
+// Resets fallback fonts by handle.
+void nvgResetFallbackFontsId(NVGcontext* ctx, int baseFont);
+
+// Resets fallback fonts by name.
+void nvgResetFallbackFonts(NVGcontext* ctx, const char* baseFont);
+
+// Sets the font size of current text style.
+void nvgFontSize(NVGcontext* ctx, float size);
+
+// Sets the blur of current text style.
+void nvgFontBlur(NVGcontext* ctx, float blur);
+
+// Sets the letter spacing of current text style.
+void nvgTextLetterSpacing(NVGcontext* ctx, float spacing);
+
+// Sets the proportional line height of current text style. The line height is specified as multiple of font size.
+void nvgTextLineHeight(NVGcontext* ctx, float lineHeight);
+
+// Sets the text align of current text style, see NVGalign for options.
+void nvgTextAlign(NVGcontext* ctx, int align);
+
+// Sets the font face based on specified id of current text style.
+void nvgFontFaceId(NVGcontext* ctx, int font);
+
+// Sets the font face based on specified name of current text style.
+void nvgFontFace(NVGcontext* ctx, const char* font);
+
+// Draws text string at specified location. If end is specified only the sub-string up to the end is drawn.
+float nvgText(NVGcontext* ctx, float x, float y, const char* string, const char* end);
+
+// Draws multi-line text string at specified location wrapped at the specified width. If end is specified only the sub-string up to the end is drawn.
+// White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.
+// Words longer than the max width are slit at nearest character (i.e. no hyphenation).
+void nvgTextBox(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end);
+
+// Measures the specified text string. Parameter bounds should be a pointer to float[4],
+// if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax]
+// Returns the horizontal advance of the measured text (i.e. where the next character should drawn).
+// Measured values are returned in local coordinate space.
+float nvgTextBounds(NVGcontext* ctx, float x, float y, const char* string, const char* end, float* bounds);
+
+// Measures the specified multi-text string. Parameter bounds should be a pointer to float[4],
+// if the bounding box of the text should be returned. The bounds value are [xmin,ymin, xmax,ymax]
+// Measured values are returned in local coordinate space.
+void nvgTextBoxBounds(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end, float* bounds);
+
+// Calculates the glyph x positions of the specified text. If end is specified only the sub-string will be used.
+// Measured values are returned in local coordinate space.
+int nvgTextGlyphPositions(NVGcontext* ctx, float x, float y, const char* string, const char* end, NVGglyphPosition* positions, int maxPositions);
+
+// Returns the vertical metrics based on the current text style.
+// Measured values are returned in local coordinate space.
+void nvgTextMetrics(NVGcontext* ctx, float* ascender, float* descender, float* lineh);
+
+// Breaks the specified text into lines. If end is specified only the sub-string will be used.
+// White space is stripped at the beginning of the rows, the text is split at word boundaries or when new-line characters are encountered.
+// Words longer than the max width are slit at nearest character (i.e. no hyphenation).
+int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, float breakRowWidth, NVGtextRow* rows, int maxRows);
+
+//
+// Internal Render API
+//
+enum NVGtexture {
+	NVG_TEXTURE_ALPHA = 0x01,
+	NVG_TEXTURE_RGBA = 0x02,
+};
+
+struct NVGscissor {
+	float xform[6];
+	float extent[2];
+};
+typedef struct NVGscissor NVGscissor;
+
+struct NVGvertex {
+	float x,y,u,v;
+};
+typedef struct NVGvertex NVGvertex;
+
+struct NVGpath {
+	int first;
+	int count;
+	unsigned char closed;
+	int nbevel;
+	NVGvertex* fill;
+	int nfill;
+	NVGvertex* stroke;
+	int nstroke;
+	int winding;
+	int convex;
+};
+typedef struct NVGpath NVGpath;
+
+struct NVGparams {
+	void* userPtr;
+	int edgeAntiAlias;
+	int (*renderCreate)(void* uptr);
+	int (*renderCreateTexture)(void* uptr, int type, int w, int h, int imageFlags, const unsigned char* data);
+	int (*renderDeleteTexture)(void* uptr, int image);
+	int (*renderUpdateTexture)(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data);
+	int (*renderGetTextureSize)(void* uptr, int image, int* w, int* h);
+	void (*renderViewport)(void* uptr, float width, float height, float devicePixelRatio);
+	void (*renderCancel)(void* uptr);
+	void (*renderFlush)(void* uptr);
+	void (*renderFill)(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe, const float* bounds, const NVGpath* paths, int npaths);
+	void (*renderStroke)(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe, float strokeWidth, const NVGpath* paths, int npaths);
+	void (*renderTriangles)(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, const NVGvertex* verts, int nverts, float fringe);
+	void (*renderDelete)(void* uptr);
+};
+typedef struct NVGparams NVGparams;
+
+// Constructor and destructor, called by the render back-end.
+NVGcontext* nvgCreateInternal(NVGparams* params);
+void nvgDeleteInternal(NVGcontext* ctx);
+
+NVGparams* nvgInternalParams(NVGcontext* ctx);
+
+// Debug function to dump cached path data.
+void nvgDebugDumpPathCache(NVGcontext* ctx);
+
+#ifdef _MSC_VER
+#pragma warning(pop)
+#endif
+
+#define NVG_NOTUSED(v) for (;;) { (void)(1 ? (void)0 : ( (void)(v) ) ); break; }
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // NANOVG_H

nanovg/nanovg_gl.h

@@ -0,0 +1,1660 @@
+//
+// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+#ifndef NANOVG_GL_H
+#define NANOVG_GL_H
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// Create flags
+
+enum NVGcreateFlags {
+	// Flag indicating if geometry based anti-aliasing is used (may not be needed when using MSAA).
+	NVG_ANTIALIAS 		= 1<<0,
+	// Flag indicating if strokes should be drawn using stencil buffer. The rendering will be a little
+	// slower, but path overlaps (i.e. self-intersecting or sharp turns) will be drawn just once.
+	NVG_STENCIL_STROKES	= 1<<1,
+	// Flag indicating that additional debug checks are done.
+	NVG_DEBUG 			= 1<<2,
+};
+
+#if defined NANOVG_GL2_IMPLEMENTATION
+#  define NANOVG_GL2 1
+#  define NANOVG_GL_IMPLEMENTATION 1
+#elif defined NANOVG_GL3_IMPLEMENTATION
+#  define NANOVG_GL3 1
+#  define NANOVG_GL_IMPLEMENTATION 1
+#  define NANOVG_GL_USE_UNIFORMBUFFER 1
+#elif defined NANOVG_GLES2_IMPLEMENTATION
+#  define NANOVG_GLES2 1
+#  define NANOVG_GL_IMPLEMENTATION 1
+#elif defined NANOVG_GLES3_IMPLEMENTATION
+#  define NANOVG_GLES3 1
+#  define NANOVG_GL_IMPLEMENTATION 1
+#endif
+
+#define NANOVG_GL_USE_STATE_FILTER (1)
+
+// Creates NanoVG contexts for different OpenGL (ES) versions.
+// Flags should be combination of the create flags above.
+
+#if defined NANOVG_GL2
+
+NVGcontext* nvgCreateGL2(int flags);
+void nvgDeleteGL2(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGL2(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGL2(NVGcontext* ctx, int image);
+
+#endif
+
+#if defined NANOVG_GL3
+
+NVGcontext* nvgCreateGL3(int flags);
+void nvgDeleteGL3(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGL3(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGL3(NVGcontext* ctx, int image);
+
+#endif
+
+#if defined NANOVG_GLES2
+
+NVGcontext* nvgCreateGLES2(int flags);
+void nvgDeleteGLES2(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGLES2(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGLES2(NVGcontext* ctx, int image);
+
+#endif
+
+#if defined NANOVG_GLES3
+
+NVGcontext* nvgCreateGLES3(int flags);
+void nvgDeleteGLES3(NVGcontext* ctx);
+
+int nvglCreateImageFromHandleGLES3(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
+GLuint nvglImageHandleGLES3(NVGcontext* ctx, int image);
+
+#endif
+
+// These are additional flags on top of NVGimageFlags.
+enum NVGimageFlagsGL {
+	NVG_IMAGE_NODELETE			= 1<<16,	// Do not delete GL texture handle.
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* NANOVG_GL_H */
+
+#ifdef NANOVG_GL_IMPLEMENTATION
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <math.h>
+#include "nanovg.h"
+
+enum GLNVGuniformLoc {
+	GLNVG_LOC_VIEWSIZE,
+	GLNVG_LOC_TEX,
+	GLNVG_LOC_FRAG,
+	GLNVG_MAX_LOCS
+};
+
+enum GLNVGshaderType {
+	NSVG_SHADER_FILLGRAD,
+	NSVG_SHADER_FILLIMG,
+	NSVG_SHADER_SIMPLE,
+	NSVG_SHADER_IMG
+};
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+enum GLNVGuniformBindings {
+	GLNVG_FRAG_BINDING = 0,
+};
+#endif
+
+struct GLNVGshader {
+	GLuint prog;
+	GLuint frag;
+	GLuint vert;
+	GLint loc[GLNVG_MAX_LOCS];
+};
+typedef struct GLNVGshader GLNVGshader;
+
+struct GLNVGtexture {
+	int id;
+	GLuint tex;
+	int width, height;
+	int type;
+	int flags;
+};
+typedef struct GLNVGtexture GLNVGtexture;
+
+struct GLNVGblend
+{
+	GLenum srcRGB;
+	GLenum dstRGB;
+	GLenum srcAlpha;
+	GLenum dstAlpha;
+};
+typedef struct GLNVGblend GLNVGblend;
+
+enum GLNVGcallType {
+	GLNVG_NONE = 0,
+	GLNVG_FILL,
+	GLNVG_CONVEXFILL,
+	GLNVG_STROKE,
+	GLNVG_TRIANGLES,
+};
+
+struct GLNVGcall {
+	int type;
+	int image;
+	int pathOffset;
+	int pathCount;
+	int triangleOffset;
+	int triangleCount;
+	int uniformOffset;
+	GLNVGblend blendFunc;
+};
+typedef struct GLNVGcall GLNVGcall;
+
+struct GLNVGpath {
+	int fillOffset;
+	int fillCount;
+	int strokeOffset;
+	int strokeCount;
+};
+typedef struct GLNVGpath GLNVGpath;
+
+struct GLNVGfragUniforms {
+	#if NANOVG_GL_USE_UNIFORMBUFFER
+		float scissorMat[12]; // matrices are actually 3 vec4s
+		float paintMat[12];
+		struct NVGcolor innerCol;
+		struct NVGcolor outerCol;
+		float scissorExt[2];
+		float scissorScale[2];
+		float extent[2];
+		float radius;
+		float feather;
+		float strokeMult;
+		float strokeThr;
+		int texType;
+		int type;
+	#else
+		// note: after modifying layout or size of uniform array,
+		// don't forget to also update the fragment shader source!
+		#define NANOVG_GL_UNIFORMARRAY_SIZE 11
+		union {
+			struct {
+				float scissorMat[12]; // matrices are actually 3 vec4s
+				float paintMat[12];
+				struct NVGcolor innerCol;
+				struct NVGcolor outerCol;
+				float scissorExt[2];
+				float scissorScale[2];
+				float extent[2];
+				float radius;
+				float feather;
+				float strokeMult;
+				float strokeThr;
+				float texType;
+				float type;
+			};
+			float uniformArray[NANOVG_GL_UNIFORMARRAY_SIZE][4];
+		};
+	#endif
+};
+typedef struct GLNVGfragUniforms GLNVGfragUniforms;
+
+struct GLNVGcontext {
+	GLNVGshader shader;
+	GLNVGtexture* textures;
+	float view[2];
+	int ntextures;
+	int ctextures;
+	int textureId;
+	GLuint vertBuf;
+#if defined NANOVG_GL3
+	GLuint vertArr;
+#endif
+#if NANOVG_GL_USE_UNIFORMBUFFER
+	GLuint fragBuf;
+#endif
+	int fragSize;
+	int flags;
+
+	// Per frame buffers
+	GLNVGcall* calls;
+	int ccalls;
+	int ncalls;
+	GLNVGpath* paths;
+	int cpaths;
+	int npaths;
+	struct NVGvertex* verts;
+	int cverts;
+	int nverts;
+	unsigned char* uniforms;
+	int cuniforms;
+	int nuniforms;
+
+	// cached state
+	#if NANOVG_GL_USE_STATE_FILTER
+	GLuint boundTexture;
+	GLuint stencilMask;
+	GLenum stencilFunc;
+	GLint stencilFuncRef;
+	GLuint stencilFuncMask;
+	GLNVGblend blendFunc;
+	#endif
+
+	int dummyTex;
+};
+typedef struct GLNVGcontext GLNVGcontext;
+
+static int glnvg__maxi(int a, int b) { return a > b ? a : b; }
+
+#ifdef NANOVG_GLES2
+static unsigned int glnvg__nearestPow2(unsigned int num)
+{
+	unsigned n = num > 0 ? num - 1 : 0;
+	n |= n >> 1;
+	n |= n >> 2;
+	n |= n >> 4;
+	n |= n >> 8;
+	n |= n >> 16;
+	n++;
+	return n;
+}
+#endif
+
+static void glnvg__bindTexture(GLNVGcontext* gl, GLuint tex)
+{
+#if NANOVG_GL_USE_STATE_FILTER
+	if (gl->boundTexture != tex) {
+		gl->boundTexture = tex;
+		glBindTexture(GL_TEXTURE_2D, tex);
+	}
+#else
+	glBindTexture(GL_TEXTURE_2D, tex);
+#endif
+}
+
+static void glnvg__stencilMask(GLNVGcontext* gl, GLuint mask)
+{
+#if NANOVG_GL_USE_STATE_FILTER
+	if (gl->stencilMask != mask) {
+		gl->stencilMask = mask;
+		glStencilMask(mask);
+	}
+#else
+	glStencilMask(mask);
+#endif
+}
+
+static void glnvg__stencilFunc(GLNVGcontext* gl, GLenum func, GLint ref, GLuint mask)
+{
+#if NANOVG_GL_USE_STATE_FILTER
+	if ((gl->stencilFunc != func) ||
+		(gl->stencilFuncRef != ref) ||
+		(gl->stencilFuncMask != mask)) {
+
+		gl->stencilFunc = func;
+		gl->stencilFuncRef = ref;
+		gl->stencilFuncMask = mask;
+		glStencilFunc(func, ref, mask);
+	}
+#else
+	glStencilFunc(func, ref, mask);
+#endif
+}
+static void glnvg__blendFuncSeparate(GLNVGcontext* gl, const GLNVGblend* blend)
+{
+#if NANOVG_GL_USE_STATE_FILTER
+	if ((gl->blendFunc.srcRGB != blend->srcRGB) ||
+		(gl->blendFunc.dstRGB != blend->dstRGB) ||
+		(gl->blendFunc.srcAlpha != blend->srcAlpha) ||
+		(gl->blendFunc.dstAlpha != blend->dstAlpha)) {
+
+		gl->blendFunc = *blend;
+		glBlendFuncSeparate(blend->srcRGB, blend->dstRGB, blend->srcAlpha,blend->dstAlpha);
+	}
+#else
+	glBlendFuncSeparate(blend->srcRGB, blend->dstRGB, blend->srcAlpha,blend->dstAlpha);
+#endif
+}
+
+static GLNVGtexture* glnvg__allocTexture(GLNVGcontext* gl)
+{
+	GLNVGtexture* tex = NULL;
+	int i;
+
+	for (i = 0; i < gl->ntextures; i++) {
+		if (gl->textures[i].id == 0) {
+			tex = &gl->textures[i];
+			break;
+		}
+	}
+	if (tex == NULL) {
+		if (gl->ntextures+1 > gl->ctextures) {
+			GLNVGtexture* textures;
+			int ctextures = glnvg__maxi(gl->ntextures+1, 4) +  gl->ctextures/2; // 1.5x Overallocate
+			textures = (GLNVGtexture*)realloc(gl->textures, sizeof(GLNVGtexture)*ctextures);
+			if (textures == NULL) return NULL;
+			gl->textures = textures;
+			gl->ctextures = ctextures;
+		}
+		tex = &gl->textures[gl->ntextures++];
+	}
+
+	memset(tex, 0, sizeof(*tex));
+	tex->id = ++gl->textureId;
+
+	return tex;
+}
+
+static GLNVGtexture* glnvg__findTexture(GLNVGcontext* gl, int id)
+{
+	int i;
+	for (i = 0; i < gl->ntextures; i++)
+		if (gl->textures[i].id == id)
+			return &gl->textures[i];
+	return NULL;
+}
+
+static int glnvg__deleteTexture(GLNVGcontext* gl, int id)
+{
+	int i;
+	for (i = 0; i < gl->ntextures; i++) {
+		if (gl->textures[i].id == id) {
+			if (gl->textures[i].tex != 0 && (gl->textures[i].flags & NVG_IMAGE_NODELETE) == 0)
+				glDeleteTextures(1, &gl->textures[i].tex);
+			memset(&gl->textures[i], 0, sizeof(gl->textures[i]));
+			return 1;
+		}
+	}
+	return 0;
+}
+
+static void glnvg__dumpShaderError(GLuint shader, const char* name, const char* type)
+{
+	GLchar str[512+1];
+	GLsizei len = 0;
+	glGetShaderInfoLog(shader, 512, &len, str);
+	if (len > 512) len = 512;
+	str[len] = '\0';
+	printf("Shader %s/%s error:\n%s\n", name, type, str);
+}
+
+static void glnvg__dumpProgramError(GLuint prog, const char* name)
+{
+	GLchar str[512+1];
+	GLsizei len = 0;
+	glGetProgramInfoLog(prog, 512, &len, str);
+	if (len > 512) len = 512;
+	str[len] = '\0';
+	printf("Program %s error:\n%s\n", name, str);
+}
+
+static void glnvg__checkError(GLNVGcontext* gl, const char* str)
+{
+	GLenum err;
+	if ((gl->flags & NVG_DEBUG) == 0) return;
+	err = glGetError();
+	if (err != GL_NO_ERROR) {
+		printf("Error %08x after %s\n", err, str);
+		return;
+	}
+}
+
+static int glnvg__createShader(GLNVGshader* shader, const char* name, const char* header, const char* opts, const char* vshader, const char* fshader)
+{
+	GLint status;
+	GLuint prog, vert, frag;
+	const char* str[3];
+	str[0] = header;
+	str[1] = opts != NULL ? opts : "";
+
+	memset(shader, 0, sizeof(*shader));
+
+	prog = glCreateProgram();
+	vert = glCreateShader(GL_VERTEX_SHADER);
+	frag = glCreateShader(GL_FRAGMENT_SHADER);
+	str[2] = vshader;
+	glShaderSource(vert, 3, str, 0);
+	str[2] = fshader;
+	glShaderSource(frag, 3, str, 0);
+
+	glCompileShader(vert);
+	glGetShaderiv(vert, GL_COMPILE_STATUS, &status);
+	if (status != GL_TRUE) {
+		glnvg__dumpShaderError(vert, name, "vert");
+		return 0;
+	}
+
+	glCompileShader(frag);
+	glGetShaderiv(frag, GL_COMPILE_STATUS, &status);
+	if (status != GL_TRUE) {
+		glnvg__dumpShaderError(frag, name, "frag");
+		return 0;
+	}
+
+	glAttachShader(prog, vert);
+	glAttachShader(prog, frag);
+
+	glBindAttribLocation(prog, 0, "vertex");
+	glBindAttribLocation(prog, 1, "tcoord");
+
+	glLinkProgram(prog);
+	glGetProgramiv(prog, GL_LINK_STATUS, &status);
+	if (status != GL_TRUE) {
+		glnvg__dumpProgramError(prog, name);
+		return 0;
+	}
+
+	shader->prog = prog;
+	shader->vert = vert;
+	shader->frag = frag;
+
+	return 1;
+}
+
+static void glnvg__deleteShader(GLNVGshader* shader)
+{
+	if (shader->prog != 0)
+		glDeleteProgram(shader->prog);
+	if (shader->vert != 0)
+		glDeleteShader(shader->vert);
+	if (shader->frag != 0)
+		glDeleteShader(shader->frag);
+}
+
+static void glnvg__getUniforms(GLNVGshader* shader)
+{
+	shader->loc[GLNVG_LOC_VIEWSIZE] = glGetUniformLocation(shader->prog, "viewSize");
+	shader->loc[GLNVG_LOC_TEX] = glGetUniformLocation(shader->prog, "tex");
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+	shader->loc[GLNVG_LOC_FRAG] = glGetUniformBlockIndex(shader->prog, "frag");
+#else
+	shader->loc[GLNVG_LOC_FRAG] = glGetUniformLocation(shader->prog, "frag");
+#endif
+}
+
+static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, int imageFlags, const unsigned char* data);
+
+static int glnvg__renderCreate(void* uptr)
+{
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	int align = 4;
+
+	// TODO: mediump float may not be enough for GLES2 in iOS.
+	// see the following discussion: https://github.com/memononen/nanovg/issues/46
+	static const char* shaderHeader =
+#if defined NANOVG_GL2
+		"#define NANOVG_GL2 1\n"
+#elif defined NANOVG_GL3
+		"#version 150 core\n"
+		"#define NANOVG_GL3 1\n"
+#elif defined NANOVG_GLES2
+		"#version 100\n"
+		"#define NANOVG_GL2 1\n"
+#elif defined NANOVG_GLES3
+		"#version 300 es\n"
+		"#define NANOVG_GL3 1\n"
+#endif
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+	"#define USE_UNIFORMBUFFER 1\n"
+#else
+	"#define UNIFORMARRAY_SIZE 11\n"
+#endif
+	"\n";
+
+	static const char* fillVertShader =
+		"#ifdef NANOVG_GL3\n"
+		"	uniform vec2 viewSize;\n"
+		"	in vec2 vertex;\n"
+		"	in vec2 tcoord;\n"
+		"	out vec2 ftcoord;\n"
+		"	out vec2 fpos;\n"
+		"#else\n"
+		"	uniform vec2 viewSize;\n"
+		"	attribute vec2 vertex;\n"
+		"	attribute vec2 tcoord;\n"
+		"	varying vec2 ftcoord;\n"
+		"	varying vec2 fpos;\n"
+		"#endif\n"
+		"void main(void) {\n"
+		"	ftcoord = tcoord;\n"
+		"	fpos = vertex;\n"
+		"	gl_Position = vec4(2.0*vertex.x/viewSize.x - 1.0, 1.0 - 2.0*vertex.y/viewSize.y, 0, 1);\n"
+		"}\n";
+
+	static const char* fillFragShader =
+		"#ifdef GL_ES\n"
+		"#if defined(GL_FRAGMENT_PRECISION_HIGH) || defined(NANOVG_GL3)\n"
+		" precision highp float;\n"
+		"#else\n"
+		" precision mediump float;\n"
+		"#endif\n"
+		"#endif\n"
+		"#ifdef NANOVG_GL3\n"
+		"#ifdef USE_UNIFORMBUFFER\n"
+		"	layout(std140) uniform frag {\n"
+		"		mat3 scissorMat;\n"
+		"		mat3 paintMat;\n"
+		"		vec4 innerCol;\n"
+		"		vec4 outerCol;\n"
+		"		vec2 scissorExt;\n"
+		"		vec2 scissorScale;\n"
+		"		vec2 extent;\n"
+		"		float radius;\n"
+		"		float feather;\n"
+		"		float strokeMult;\n"
+		"		float strokeThr;\n"
+		"		int texType;\n"
+		"		int type;\n"
+		"	};\n"
+		"#else\n" // NANOVG_GL3 && !USE_UNIFORMBUFFER
+		"	uniform vec4 frag[UNIFORMARRAY_SIZE];\n"
+		"#endif\n"
+		"	uniform sampler2D tex;\n"
+		"	in vec2 ftcoord;\n"
+		"	in vec2 fpos;\n"
+		"	out vec4 outColor;\n"
+		"#else\n" // !NANOVG_GL3
+		"	uniform vec4 frag[UNIFORMARRAY_SIZE];\n"
+		"	uniform sampler2D tex;\n"
+		"	varying vec2 ftcoord;\n"
+		"	varying vec2 fpos;\n"
+		"#endif\n"
+		"#ifndef USE_UNIFORMBUFFER\n"
+		"	#define scissorMat mat3(frag[0].xyz, frag[1].xyz, frag[2].xyz)\n"
+		"	#define paintMat mat3(frag[3].xyz, frag[4].xyz, frag[5].xyz)\n"
+		"	#define innerCol frag[6]\n"
+		"	#define outerCol frag[7]\n"
+		"	#define scissorExt frag[8].xy\n"
+		"	#define scissorScale frag[8].zw\n"
+		"	#define extent frag[9].xy\n"
+		"	#define radius frag[9].z\n"
+		"	#define feather frag[9].w\n"
+		"	#define strokeMult frag[10].x\n"
+		"	#define strokeThr frag[10].y\n"
+		"	#define texType int(frag[10].z)\n"
+		"	#define type int(frag[10].w)\n"
+		"#endif\n"
+		"\n"
+		"float sdroundrect(vec2 pt, vec2 ext, float rad) {\n"
+		"	vec2 ext2 = ext - vec2(rad,rad);\n"
+		"	vec2 d = abs(pt) - ext2;\n"
+		"	return min(max(d.x,d.y),0.0) + length(max(d,0.0)) - rad;\n"
+		"}\n"
+		"\n"
+		"// Scissoring\n"
+		"float scissorMask(vec2 p) {\n"
+		"	vec2 sc = (abs((scissorMat * vec3(p,1.0)).xy) - scissorExt);\n"
+		"	sc = vec2(0.5,0.5) - sc * scissorScale;\n"
+		"	return clamp(sc.x,0.0,1.0) * clamp(sc.y,0.0,1.0);\n"
+		"}\n"
+		"#ifdef EDGE_AA\n"
+		"// Stroke - from [0..1] to clipped pyramid, where the slope is 1px.\n"
+		"float strokeMask() {\n"
+		"	return min(1.0, (1.0-abs(ftcoord.x*2.0-1.0))*strokeMult) * min(1.0, ftcoord.y);\n"
+		"}\n"
+		"#endif\n"
+		"\n"
+		"void main(void) {\n"
+		"   vec4 result;\n"
+		"	float scissor = scissorMask(fpos);\n"
+		"#ifdef EDGE_AA\n"
+		"	float strokeAlpha = strokeMask();\n"
+		"	if (strokeAlpha < strokeThr) discard;\n"
+		"#else\n"
+		"	float strokeAlpha = 1.0;\n"
+		"#endif\n"
+		"	if (type == 0) {			// Gradient\n"
+		"		// Calculate gradient color using box gradient\n"
+		"		vec2 pt = (paintMat * vec3(fpos,1.0)).xy;\n"
+		"		float d = clamp((sdroundrect(pt, extent, radius) + feather*0.5) / feather, 0.0, 1.0);\n"
+		"		vec4 color = mix(innerCol,outerCol,d);\n"
+		"		// Combine alpha\n"
+		"		color *= strokeAlpha * scissor;\n"
+		"		result = color;\n"
+		"	} else if (type == 1) {		// Image\n"
+		"		// Calculate color fron texture\n"
+		"		vec2 pt = (paintMat * vec3(fpos,1.0)).xy / extent;\n"
+		"#ifdef NANOVG_GL3\n"
+		"		vec4 color = texture(tex, pt);\n"
+		"#else\n"
+		"		vec4 color = texture2D(tex, pt);\n"
+		"#endif\n"
+		"		if (texType == 1) color = vec4(color.xyz*color.w,color.w);"
+		"		if (texType == 2) color = vec4(color.x);"
+		"		// Apply color tint and alpha.\n"
+		"		color *= innerCol;\n"
+		"		// Combine alpha\n"
+		"		color *= strokeAlpha * scissor;\n"
+		"		result = color;\n"
+		"	} else if (type == 2) {		// Stencil fill\n"
+		"		result = vec4(1,1,1,1);\n"
+		"	} else if (type == 3) {		// Textured tris\n"
+		"#ifdef NANOVG_GL3\n"
+		"		vec4 color = texture(tex, ftcoord);\n"
+		"#else\n"
+		"		vec4 color = texture2D(tex, ftcoord);\n"
+		"#endif\n"
+		"		if (texType == 1) color = vec4(color.xyz*color.w,color.w);"
+		"		if (texType == 2) color = vec4(color.x);"
+		"		color *= scissor;\n"
+		"		result = color * innerCol;\n"
+		"	}\n"
+		"#ifdef NANOVG_GL3\n"
+		"	outColor = result;\n"
+		"#else\n"
+		"	gl_FragColor = result;\n"
+		"#endif\n"
+		"}\n";
+
+	glnvg__checkError(gl, "init");
+
+	if (gl->flags & NVG_ANTIALIAS) {
+		if (glnvg__createShader(&gl->shader, "shader", shaderHeader, "#define EDGE_AA 1\n", fillVertShader, fillFragShader) == 0)
+			return 0;
+	} else {
+		if (glnvg__createShader(&gl->shader, "shader", shaderHeader, NULL, fillVertShader, fillFragShader) == 0)
+			return 0;
+	}
+
+	glnvg__checkError(gl, "uniform locations");
+	glnvg__getUniforms(&gl->shader);
+
+	// Create dynamic vertex array
+#if defined NANOVG_GL3
+	glGenVertexArrays(1, &gl->vertArr);
+#endif
+	glGenBuffers(1, &gl->vertBuf);
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+	// Create UBOs
+	glUniformBlockBinding(gl->shader.prog, gl->shader.loc[GLNVG_LOC_FRAG], GLNVG_FRAG_BINDING);
+	glGenBuffers(1, &gl->fragBuf);
+	glGetIntegerv(GL_UNIFORM_BUFFER_OFFSET_ALIGNMENT, &align);
+#endif
+	gl->fragSize = sizeof(GLNVGfragUniforms) + align - sizeof(GLNVGfragUniforms) % align;
+
+	// Some platforms does not allow to have samples to unset textures.
+	// Create empty one which is bound when there's no texture specified.
+	gl->dummyTex = glnvg__renderCreateTexture(gl, NVG_TEXTURE_ALPHA, 1, 1, 0, NULL);
+
+	glnvg__checkError(gl, "create done");
+
+	glFinish();
+
+	return 1;
+}
+
+static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, int imageFlags, const unsigned char* data)
+{
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	GLNVGtexture* tex = glnvg__allocTexture(gl);
+
+	if (tex == NULL) return 0;
+
+#ifdef NANOVG_GLES2
+	// Check for non-power of 2.
+	if (glnvg__nearestPow2(w) != (unsigned int)w || glnvg__nearestPow2(h) != (unsigned int)h) {
+		// No repeat
+		if ((imageFlags & NVG_IMAGE_REPEATX) != 0 || (imageFlags & NVG_IMAGE_REPEATY) != 0) {
+			printf("Repeat X/Y is not supported for non power-of-two textures (%d x %d)\n", w, h);
+			imageFlags &= ~(NVG_IMAGE_REPEATX | NVG_IMAGE_REPEATY);
+		}
+		// No mips.
+		if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) {
+			printf("Mip-maps is not support for non power-of-two textures (%d x %d)\n", w, h);
+			imageFlags &= ~NVG_IMAGE_GENERATE_MIPMAPS;
+		}
+	}
+#endif
+
+	glGenTextures(1, &tex->tex);
+	tex->width = w;
+	tex->height = h;
+	tex->type = type;
+	tex->flags = imageFlags;
+	glnvg__bindTexture(gl, tex->tex);
+
+	glPixelStorei(GL_UNPACK_ALIGNMENT,1);
+#ifndef NANOVG_GLES2
+	glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width);
+	glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+	glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+#endif
+
+#if defined (NANOVG_GL2)
+	// GL 1.4 and later has support for generating mipmaps using a tex parameter.
+	if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) {
+		glTexParameteri(GL_TEXTURE_2D, GL_GENERATE_MIPMAP, GL_TRUE);
+	}
+#endif
+
+	if (type == NVG_TEXTURE_RGBA)
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, w, h, 0, GL_RGBA, GL_UNSIGNED_BYTE, data);
+	else
+#if defined(NANOVG_GLES2) || defined (NANOVG_GL2)
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_LUMINANCE, w, h, 0, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
+#elif defined(NANOVG_GLES3)
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_R8, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, data);
+#else
+		glTexImage2D(GL_TEXTURE_2D, 0, GL_RED, w, h, 0, GL_RED, GL_UNSIGNED_BYTE, data);
+#endif
+
+	if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) {
+		if (imageFlags & NVG_IMAGE_NEAREST) {
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST_MIPMAP_NEAREST);
+		} else {
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+		}
+	} else {
+		if (imageFlags & NVG_IMAGE_NEAREST) {
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
+		} else {
+			glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+		}
+	}
+
+	if (imageFlags & NVG_IMAGE_NEAREST) {
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
+	} else {
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
+	}
+
+	if (imageFlags & NVG_IMAGE_REPEATX)
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
+	else
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
+
+	if (imageFlags & NVG_IMAGE_REPEATY)
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
+	else
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
+
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+#ifndef NANOVG_GLES2
+	glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+	glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+	glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+#endif
+
+	// The new way to build mipmaps on GLES and GL3
+#if !defined(NANOVG_GL2)
+	if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) {
+		glGenerateMipmap(GL_TEXTURE_2D);
+	}
+#endif
+
+	glnvg__checkError(gl, "create tex");
+	glnvg__bindTexture(gl, 0);
+
+	return tex->id;
+}
+
+
+static int glnvg__renderDeleteTexture(void* uptr, int image)
+{
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	return glnvg__deleteTexture(gl, image);
+}
+
+static int glnvg__renderUpdateTexture(void* uptr, int image, int x, int y, int w, int h, const unsigned char* data)
+{
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	GLNVGtexture* tex = glnvg__findTexture(gl, image);
+
+	if (tex == NULL) return 0;
+	glnvg__bindTexture(gl, tex->tex);
+
+	glPixelStorei(GL_UNPACK_ALIGNMENT,1);
+
+#ifndef NANOVG_GLES2
+	glPixelStorei(GL_UNPACK_ROW_LENGTH, tex->width);
+	glPixelStorei(GL_UNPACK_SKIP_PIXELS, x);
+	glPixelStorei(GL_UNPACK_SKIP_ROWS, y);
+#else
+	// No support for all of skip, need to update a whole row at a time.
+	if (tex->type == NVG_TEXTURE_RGBA)
+		data += y*tex->width*4;
+	else
+		data += y*tex->width;
+	x = 0;
+	w = tex->width;
+#endif
+
+	if (tex->type == NVG_TEXTURE_RGBA)
+		glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RGBA, GL_UNSIGNED_BYTE, data);
+	else
+#if defined(NANOVG_GLES2) || defined(NANOVG_GL2)
+		glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_LUMINANCE, GL_UNSIGNED_BYTE, data);
+#else
+		glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RED, GL_UNSIGNED_BYTE, data);
+#endif
+
+	glPixelStorei(GL_UNPACK_ALIGNMENT, 4);
+#ifndef NANOVG_GLES2
+	glPixelStorei(GL_UNPACK_ROW_LENGTH, 0);
+	glPixelStorei(GL_UNPACK_SKIP_PIXELS, 0);
+	glPixelStorei(GL_UNPACK_SKIP_ROWS, 0);
+#endif
+
+	glnvg__bindTexture(gl, 0);
+
+	return 1;
+}
+
+static int glnvg__renderGetTextureSize(void* uptr, int image, int* w, int* h)
+{
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	GLNVGtexture* tex = glnvg__findTexture(gl, image);
+	if (tex == NULL) return 0;
+	*w = tex->width;
+	*h = tex->height;
+	return 1;
+}
+
+static void glnvg__xformToMat3x4(float* m3, float* t)
+{
+	m3[0] = t[0];
+	m3[1] = t[1];
+	m3[2] = 0.0f;
+	m3[3] = 0.0f;
+	m3[4] = t[2];
+	m3[5] = t[3];
+	m3[6] = 0.0f;
+	m3[7] = 0.0f;
+	m3[8] = t[4];
+	m3[9] = t[5];
+	m3[10] = 1.0f;
+	m3[11] = 0.0f;
+}
+
+static NVGcolor glnvg__premulColor(NVGcolor c)
+{
+	c.r *= c.a;
+	c.g *= c.a;
+	c.b *= c.a;
+	return c;
+}
+
+static int glnvg__convertPaint(GLNVGcontext* gl, GLNVGfragUniforms* frag, NVGpaint* paint,
+							   NVGscissor* scissor, float width, float fringe, float strokeThr)
+{
+	GLNVGtexture* tex = NULL;
+	float invxform[6];
+
+	memset(frag, 0, sizeof(*frag));
+
+	frag->innerCol = glnvg__premulColor(paint->innerColor);
+	frag->outerCol = glnvg__premulColor(paint->outerColor);
+
+	if (scissor->extent[0] < -0.5f || scissor->extent[1] < -0.5f) {
+		memset(frag->scissorMat, 0, sizeof(frag->scissorMat));
+		frag->scissorExt[0] = 1.0f;
+		frag->scissorExt[1] = 1.0f;
+		frag->scissorScale[0] = 1.0f;
+		frag->scissorScale[1] = 1.0f;
+	} else {
+		nvgTransformInverse(invxform, scissor->xform);
+		glnvg__xformToMat3x4(frag->scissorMat, invxform);
+		frag->scissorExt[0] = scissor->extent[0];
+		frag->scissorExt[1] = scissor->extent[1];
+		frag->scissorScale[0] = sqrtf(scissor->xform[0]*scissor->xform[0] + scissor->xform[2]*scissor->xform[2]) / fringe;
+		frag->scissorScale[1] = sqrtf(scissor->xform[1]*scissor->xform[1] + scissor->xform[3]*scissor->xform[3]) / fringe;
+	}
+
+	memcpy(frag->extent, paint->extent, sizeof(frag->extent));
+	frag->strokeMult = (width*0.5f + fringe*0.5f) / fringe;
+	frag->strokeThr = strokeThr;
+
+	if (paint->image != 0) {
+		tex = glnvg__findTexture(gl, paint->image);
+		if (tex == NULL) return 0;
+		if ((tex->flags & NVG_IMAGE_FLIPY) != 0) {
+			float m1[6], m2[6];
+			nvgTransformTranslate(m1, 0.0f, frag->extent[1] * 0.5f);
+			nvgTransformMultiply(m1, paint->xform);
+			nvgTransformScale(m2, 1.0f, -1.0f);
+			nvgTransformMultiply(m2, m1);
+			nvgTransformTranslate(m1, 0.0f, -frag->extent[1] * 0.5f);
+			nvgTransformMultiply(m1, m2);
+			nvgTransformInverse(invxform, m1);
+		} else {
+			nvgTransformInverse(invxform, paint->xform);
+		}
+		frag->type = NSVG_SHADER_FILLIMG;
+
+		#if NANOVG_GL_USE_UNIFORMBUFFER
+		if (tex->type == NVG_TEXTURE_RGBA)
+			frag->texType = (tex->flags & NVG_IMAGE_PREMULTIPLIED) ? 0 : 1;
+		else
+			frag->texType = 2;
+		#else
+		if (tex->type == NVG_TEXTURE_RGBA)
+			frag->texType = (tex->flags & NVG_IMAGE_PREMULTIPLIED) ? 0.0f : 1.0f;
+		else
+			frag->texType = 2.0f;
+		#endif
+//		printf("frag->texType = %d\n", frag->texType);
+	} else {
+		frag->type = NSVG_SHADER_FILLGRAD;
+		frag->radius = paint->radius;
+		frag->feather = paint->feather;
+		nvgTransformInverse(invxform, paint->xform);
+	}
+
+	glnvg__xformToMat3x4(frag->paintMat, invxform);
+
+	return 1;
+}
+
+static GLNVGfragUniforms* nvg__fragUniformPtr(GLNVGcontext* gl, int i);
+
+static void glnvg__setUniforms(GLNVGcontext* gl, int uniformOffset, int image)
+{
+	GLNVGtexture* tex = NULL;
+#if NANOVG_GL_USE_UNIFORMBUFFER
+	glBindBufferRange(GL_UNIFORM_BUFFER, GLNVG_FRAG_BINDING, gl->fragBuf, uniformOffset, sizeof(GLNVGfragUniforms));
+#else
+	GLNVGfragUniforms* frag = nvg__fragUniformPtr(gl, uniformOffset);
+	glUniform4fv(gl->shader.loc[GLNVG_LOC_FRAG], NANOVG_GL_UNIFORMARRAY_SIZE, &(frag->uniformArray[0][0]));
+#endif
+
+	if (image != 0) {
+		tex = glnvg__findTexture(gl, image);
+	}
+	// If no image is set, use empty texture
+	if (tex == NULL) {
+		tex = glnvg__findTexture(gl, gl->dummyTex);
+	}
+	glnvg__bindTexture(gl, tex != NULL ? tex->tex : 0);
+	glnvg__checkError(gl, "tex paint tex");
+}
+
+static void glnvg__renderViewport(void* uptr, float width, float height, float devicePixelRatio)
+{
+	NVG_NOTUSED(devicePixelRatio);
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	gl->view[0] = width;
+	gl->view[1] = height;
+}
+
+static void glnvg__fill(GLNVGcontext* gl, GLNVGcall* call)
+{
+	GLNVGpath* paths = &gl->paths[call->pathOffset];
+	int i, npaths = call->pathCount;
+
+	// Draw shapes
+	glEnable(GL_STENCIL_TEST);
+	glnvg__stencilMask(gl, 0xff);
+	glnvg__stencilFunc(gl, GL_ALWAYS, 0, 0xff);
+	glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+
+	// set bindpoint for solid loc
+	glnvg__setUniforms(gl, call->uniformOffset, 0);
+	glnvg__checkError(gl, "fill simple");
+
+	glStencilOpSeparate(GL_FRONT, GL_KEEP, GL_KEEP, GL_INCR_WRAP);
+	glStencilOpSeparate(GL_BACK, GL_KEEP, GL_KEEP, GL_DECR_WRAP);
+	glDisable(GL_CULL_FACE);
+	for (i = 0; i < npaths; i++)
+		glDrawArrays(GL_TRIANGLE_FAN, paths[i].fillOffset, paths[i].fillCount);
+	glEnable(GL_CULL_FACE);
+
+	// Draw anti-aliased pixels
+	glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+
+	glnvg__setUniforms(gl, call->uniformOffset + gl->fragSize, call->image);
+	glnvg__checkError(gl, "fill fill");
+
+	if (gl->flags & NVG_ANTIALIAS) {
+		glnvg__stencilFunc(gl, GL_EQUAL, 0x00, 0xff);
+		glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+		// Draw fringes
+		for (i = 0; i < npaths; i++)
+			glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+	}
+
+	// Draw fill
+	glnvg__stencilFunc(gl, GL_NOTEQUAL, 0x0, 0xff);
+	glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO);
+	glDrawArrays(GL_TRIANGLE_STRIP, call->triangleOffset, call->triangleCount);
+
+	glDisable(GL_STENCIL_TEST);
+}
+
+static void glnvg__convexFill(GLNVGcontext* gl, GLNVGcall* call)
+{
+	GLNVGpath* paths = &gl->paths[call->pathOffset];
+	int i, npaths = call->pathCount;
+
+	glnvg__setUniforms(gl, call->uniformOffset, call->image);
+	glnvg__checkError(gl, "convex fill");
+
+	for (i = 0; i < npaths; i++) {
+		glDrawArrays(GL_TRIANGLE_FAN, paths[i].fillOffset, paths[i].fillCount);
+		// Draw fringes
+		if (paths[i].strokeCount > 0) {
+			glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+		}
+	}
+}
+
+static void glnvg__stroke(GLNVGcontext* gl, GLNVGcall* call)
+{
+	GLNVGpath* paths = &gl->paths[call->pathOffset];
+	int npaths = call->pathCount, i;
+
+	if (gl->flags & NVG_STENCIL_STROKES) {
+
+		glEnable(GL_STENCIL_TEST);
+		glnvg__stencilMask(gl, 0xff);
+
+		// Fill the stroke base without overlap
+		glnvg__stencilFunc(gl, GL_EQUAL, 0x0, 0xff);
+		glStencilOp(GL_KEEP, GL_KEEP, GL_INCR);
+		glnvg__setUniforms(gl, call->uniformOffset + gl->fragSize, call->image);
+		glnvg__checkError(gl, "stroke fill 0");
+		for (i = 0; i < npaths; i++)
+			glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+
+		// Draw anti-aliased pixels.
+		glnvg__setUniforms(gl, call->uniformOffset, call->image);
+		glnvg__stencilFunc(gl, GL_EQUAL, 0x00, 0xff);
+		glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+		for (i = 0; i < npaths; i++)
+			glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+
+		// Clear stencil buffer.
+		glColorMask(GL_FALSE, GL_FALSE, GL_FALSE, GL_FALSE);
+		glnvg__stencilFunc(gl, GL_ALWAYS, 0x0, 0xff);
+		glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO);
+		glnvg__checkError(gl, "stroke fill 1");
+		for (i = 0; i < npaths; i++)
+			glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+		glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+
+		glDisable(GL_STENCIL_TEST);
+
+//		glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, strokeWidth, fringe, 1.0f - 0.5f/255.0f);
+
+	} else {
+		glnvg__setUniforms(gl, call->uniformOffset, call->image);
+		glnvg__checkError(gl, "stroke fill");
+		// Draw Strokes
+		for (i = 0; i < npaths; i++)
+			glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+	}
+}
+
+static void glnvg__triangles(GLNVGcontext* gl, GLNVGcall* call)
+{
+	glnvg__setUniforms(gl, call->uniformOffset, call->image);
+	glnvg__checkError(gl, "triangles fill");
+
+	glDrawArrays(GL_TRIANGLES, call->triangleOffset, call->triangleCount);
+}
+
+static void glnvg__renderCancel(void* uptr) {
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	gl->nverts = 0;
+	gl->npaths = 0;
+	gl->ncalls = 0;
+	gl->nuniforms = 0;
+}
+
+static GLenum glnvg_convertBlendFuncFactor(int factor)
+{
+	if (factor == NVG_ZERO)
+		return GL_ZERO;
+	if (factor == NVG_ONE)
+		return GL_ONE;
+	if (factor == NVG_SRC_COLOR)
+		return GL_SRC_COLOR;
+	if (factor == NVG_ONE_MINUS_SRC_COLOR)
+		return GL_ONE_MINUS_SRC_COLOR;
+	if (factor == NVG_DST_COLOR)
+		return GL_DST_COLOR;
+	if (factor == NVG_ONE_MINUS_DST_COLOR)
+		return GL_ONE_MINUS_DST_COLOR;
+	if (factor == NVG_SRC_ALPHA)
+		return GL_SRC_ALPHA;
+	if (factor == NVG_ONE_MINUS_SRC_ALPHA)
+		return GL_ONE_MINUS_SRC_ALPHA;
+	if (factor == NVG_DST_ALPHA)
+		return GL_DST_ALPHA;
+	if (factor == NVG_ONE_MINUS_DST_ALPHA)
+		return GL_ONE_MINUS_DST_ALPHA;
+	if (factor == NVG_SRC_ALPHA_SATURATE)
+		return GL_SRC_ALPHA_SATURATE;
+	return GL_INVALID_ENUM;
+}
+
+static GLNVGblend glnvg__blendCompositeOperation(NVGcompositeOperationState op)
+{
+	GLNVGblend blend;
+	blend.srcRGB = glnvg_convertBlendFuncFactor(op.srcRGB);
+	blend.dstRGB = glnvg_convertBlendFuncFactor(op.dstRGB);
+	blend.srcAlpha = glnvg_convertBlendFuncFactor(op.srcAlpha);
+	blend.dstAlpha = glnvg_convertBlendFuncFactor(op.dstAlpha);
+	if (blend.srcRGB == GL_INVALID_ENUM || blend.dstRGB == GL_INVALID_ENUM || blend.srcAlpha == GL_INVALID_ENUM || blend.dstAlpha == GL_INVALID_ENUM)
+	{
+		blend.srcRGB = GL_ONE;
+		blend.dstRGB = GL_ONE_MINUS_SRC_ALPHA;
+		blend.srcAlpha = GL_ONE;
+		blend.dstAlpha = GL_ONE_MINUS_SRC_ALPHA;
+	}
+	return blend;
+}
+
+static void glnvg__renderFlush(void* uptr)
+{
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	int i;
+
+	if (gl->ncalls > 0) {
+
+		// Setup require GL state.
+		glUseProgram(gl->shader.prog);
+
+		glEnable(GL_CULL_FACE);
+		glCullFace(GL_BACK);
+		glFrontFace(GL_CCW);
+		glEnable(GL_BLEND);
+		glDisable(GL_DEPTH_TEST);
+		glDisable(GL_SCISSOR_TEST);
+		glColorMask(GL_TRUE, GL_TRUE, GL_TRUE, GL_TRUE);
+		glStencilMask(0xffffffff);
+		glStencilOp(GL_KEEP, GL_KEEP, GL_KEEP);
+		glStencilFunc(GL_ALWAYS, 0, 0xffffffff);
+		glActiveTexture(GL_TEXTURE0);
+		glBindTexture(GL_TEXTURE_2D, 0);
+		#if NANOVG_GL_USE_STATE_FILTER
+		gl->boundTexture = 0;
+		gl->stencilMask = 0xffffffff;
+		gl->stencilFunc = GL_ALWAYS;
+		gl->stencilFuncRef = 0;
+		gl->stencilFuncMask = 0xffffffff;
+		gl->blendFunc.srcRGB = GL_INVALID_ENUM;
+		gl->blendFunc.srcAlpha = GL_INVALID_ENUM;
+		gl->blendFunc.dstRGB = GL_INVALID_ENUM;
+		gl->blendFunc.dstAlpha = GL_INVALID_ENUM;
+		#endif
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+		// Upload ubo for frag shaders
+		glBindBuffer(GL_UNIFORM_BUFFER, gl->fragBuf);
+		glBufferData(GL_UNIFORM_BUFFER, gl->nuniforms * gl->fragSize, gl->uniforms, GL_STREAM_DRAW);
+#endif
+
+		// Upload vertex data
+#if defined NANOVG_GL3
+		glBindVertexArray(gl->vertArr);
+#endif
+		glBindBuffer(GL_ARRAY_BUFFER, gl->vertBuf);
+		glBufferData(GL_ARRAY_BUFFER, gl->nverts * sizeof(NVGvertex), gl->verts, GL_STREAM_DRAW);
+		glEnableVertexAttribArray(0);
+		glEnableVertexAttribArray(1);
+		glVertexAttribPointer(0, 2, GL_FLOAT, GL_FALSE, sizeof(NVGvertex), (const GLvoid*)(size_t)0);
+		glVertexAttribPointer(1, 2, GL_FLOAT, GL_FALSE, sizeof(NVGvertex), (const GLvoid*)(0 + 2*sizeof(float)));
+
+		// Set view and texture just once per frame.
+		glUniform1i(gl->shader.loc[GLNVG_LOC_TEX], 0);
+		glUniform2fv(gl->shader.loc[GLNVG_LOC_VIEWSIZE], 1, gl->view);
+
+#if NANOVG_GL_USE_UNIFORMBUFFER
+		glBindBuffer(GL_UNIFORM_BUFFER, gl->fragBuf);
+#endif
+
+		for (i = 0; i < gl->ncalls; i++) {
+			GLNVGcall* call = &gl->calls[i];
+			glnvg__blendFuncSeparate(gl,&call->blendFunc);
+			if (call->type == GLNVG_FILL)
+				glnvg__fill(gl, call);
+			else if (call->type == GLNVG_CONVEXFILL)
+				glnvg__convexFill(gl, call);
+			else if (call->type == GLNVG_STROKE)
+				glnvg__stroke(gl, call);
+			else if (call->type == GLNVG_TRIANGLES)
+				glnvg__triangles(gl, call);
+		}
+
+		glDisableVertexAttribArray(0);
+		glDisableVertexAttribArray(1);
+#if defined NANOVG_GL3
+		glBindVertexArray(0);
+#endif
+		glDisable(GL_CULL_FACE);
+			glBindBuffer(GL_ARRAY_BUFFER, 0);
+		glUseProgram(0);
+		glnvg__bindTexture(gl, 0);
+	}
+
+	// Reset calls
+	gl->nverts = 0;
+	gl->npaths = 0;
+	gl->ncalls = 0;
+	gl->nuniforms = 0;
+}
+
+static int glnvg__maxVertCount(const NVGpath* paths, int npaths)
+{
+	int i, count = 0;
+	for (i = 0; i < npaths; i++) {
+		count += paths[i].nfill;
+		count += paths[i].nstroke;
+	}
+	return count;
+}
+
+static GLNVGcall* glnvg__allocCall(GLNVGcontext* gl)
+{
+	GLNVGcall* ret = NULL;
+	if (gl->ncalls+1 > gl->ccalls) {
+		GLNVGcall* calls;
+		int ccalls = glnvg__maxi(gl->ncalls+1, 128) + gl->ccalls/2; // 1.5x Overallocate
+		calls = (GLNVGcall*)realloc(gl->calls, sizeof(GLNVGcall) * ccalls);
+		if (calls == NULL) return NULL;
+		gl->calls = calls;
+		gl->ccalls = ccalls;
+	}
+	ret = &gl->calls[gl->ncalls++];
+	memset(ret, 0, sizeof(GLNVGcall));
+	return ret;
+}
+
+static int glnvg__allocPaths(GLNVGcontext* gl, int n)
+{
+	int ret = 0;
+	if (gl->npaths+n > gl->cpaths) {
+		GLNVGpath* paths;
+		int cpaths = glnvg__maxi(gl->npaths + n, 128) + gl->cpaths/2; // 1.5x Overallocate
+		paths = (GLNVGpath*)realloc(gl->paths, sizeof(GLNVGpath) * cpaths);
+		if (paths == NULL) return -1;
+		gl->paths = paths;
+		gl->cpaths = cpaths;
+	}
+	ret = gl->npaths;
+	gl->npaths += n;
+	return ret;
+}
+
+static int glnvg__allocVerts(GLNVGcontext* gl, int n)
+{
+	int ret = 0;
+	if (gl->nverts+n > gl->cverts) {
+		NVGvertex* verts;
+		int cverts = glnvg__maxi(gl->nverts + n, 4096) + gl->cverts/2; // 1.5x Overallocate
+		verts = (NVGvertex*)realloc(gl->verts, sizeof(NVGvertex) * cverts);
+		if (verts == NULL) return -1;
+		gl->verts = verts;
+		gl->cverts = cverts;
+	}
+	ret = gl->nverts;
+	gl->nverts += n;
+	return ret;
+}
+
+static int glnvg__allocFragUniforms(GLNVGcontext* gl, int n)
+{
+	int ret = 0, structSize = gl->fragSize;
+	if (gl->nuniforms+n > gl->cuniforms) {
+		unsigned char* uniforms;
+		int cuniforms = glnvg__maxi(gl->nuniforms+n, 128) + gl->cuniforms/2; // 1.5x Overallocate
+		uniforms = (unsigned char*)realloc(gl->uniforms, structSize * cuniforms);
+		if (uniforms == NULL) return -1;
+		gl->uniforms = uniforms;
+		gl->cuniforms = cuniforms;
+	}
+	ret = gl->nuniforms * structSize;
+	gl->nuniforms += n;
+	return ret;
+}
+
+static GLNVGfragUniforms* nvg__fragUniformPtr(GLNVGcontext* gl, int i)
+{
+	return (GLNVGfragUniforms*)&gl->uniforms[i];
+}
+
+static void glnvg__vset(NVGvertex* vtx, float x, float y, float u, float v)
+{
+	vtx->x = x;
+	vtx->y = y;
+	vtx->u = u;
+	vtx->v = v;
+}
+
+static void glnvg__renderFill(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe,
+							  const float* bounds, const NVGpath* paths, int npaths)
+{
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	GLNVGcall* call = glnvg__allocCall(gl);
+	NVGvertex* quad;
+	GLNVGfragUniforms* frag;
+	int i, maxverts, offset;
+
+	if (call == NULL) return;
+
+	call->type = GLNVG_FILL;
+	call->triangleCount = 4;
+	call->pathOffset = glnvg__allocPaths(gl, npaths);
+	if (call->pathOffset == -1) goto error;
+	call->pathCount = npaths;
+	call->image = paint->image;
+	call->blendFunc = glnvg__blendCompositeOperation(compositeOperation);
+
+	if (npaths == 1 && paths[0].convex)
+	{
+		call->type = GLNVG_CONVEXFILL;
+		call->triangleCount = 0;	// Bounding box fill quad not needed for convex fill
+	}
+
+	// Allocate vertices for all the paths.
+	maxverts = glnvg__maxVertCount(paths, npaths) + call->triangleCount;
+	offset = glnvg__allocVerts(gl, maxverts);
+	if (offset == -1) goto error;
+
+	for (i = 0; i < npaths; i++) {
+		GLNVGpath* copy = &gl->paths[call->pathOffset + i];
+		const NVGpath* path = &paths[i];
+		memset(copy, 0, sizeof(GLNVGpath));
+		if (path->nfill > 0) {
+			copy->fillOffset = offset;
+			copy->fillCount = path->nfill;
+			memcpy(&gl->verts[offset], path->fill, sizeof(NVGvertex) * path->nfill);
+			offset += path->nfill;
+		}
+		if (path->nstroke > 0) {
+			copy->strokeOffset = offset;
+			copy->strokeCount = path->nstroke;
+			memcpy(&gl->verts[offset], path->stroke, sizeof(NVGvertex) * path->nstroke);
+			offset += path->nstroke;
+		}
+	}
+
+	// Setup uniforms for draw calls
+	if (call->type == GLNVG_FILL) {
+		// Quad
+		call->triangleOffset = offset;
+		quad = &gl->verts[call->triangleOffset];
+		glnvg__vset(&quad[0], bounds[2], bounds[3], 0.5f, 1.0f);
+		glnvg__vset(&quad[1], bounds[2], bounds[1], 0.5f, 1.0f);
+		glnvg__vset(&quad[2], bounds[0], bounds[3], 0.5f, 1.0f);
+		glnvg__vset(&quad[3], bounds[0], bounds[1], 0.5f, 1.0f);
+
+		call->uniformOffset = glnvg__allocFragUniforms(gl, 2);
+		if (call->uniformOffset == -1) goto error;
+		// Simple shader for stencil
+		frag = nvg__fragUniformPtr(gl, call->uniformOffset);
+		memset(frag, 0, sizeof(*frag));
+		frag->strokeThr = -1.0f;
+		frag->type = NSVG_SHADER_SIMPLE;
+		// Fill shader
+		glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, fringe, fringe, -1.0f);
+	} else {
+		call->uniformOffset = glnvg__allocFragUniforms(gl, 1);
+		if (call->uniformOffset == -1) goto error;
+		// Fill shader
+		glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, fringe, fringe, -1.0f);
+	}
+
+	return;
+
+error:
+	// We get here if call alloc was ok, but something else is not.
+	// Roll back the last call to prevent drawing it.
+	if (gl->ncalls > 0) gl->ncalls--;
+}
+
+static void glnvg__renderStroke(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor, float fringe,
+								float strokeWidth, const NVGpath* paths, int npaths)
+{
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	GLNVGcall* call = glnvg__allocCall(gl);
+	int i, maxverts, offset;
+
+	if (call == NULL) return;
+
+	call->type = GLNVG_STROKE;
+	call->pathOffset = glnvg__allocPaths(gl, npaths);
+	if (call->pathOffset == -1) goto error;
+	call->pathCount = npaths;
+	call->image = paint->image;
+	call->blendFunc = glnvg__blendCompositeOperation(compositeOperation);
+
+	// Allocate vertices for all the paths.
+	maxverts = glnvg__maxVertCount(paths, npaths);
+	offset = glnvg__allocVerts(gl, maxverts);
+	if (offset == -1) goto error;
+
+	for (i = 0; i < npaths; i++) {
+		GLNVGpath* copy = &gl->paths[call->pathOffset + i];
+		const NVGpath* path = &paths[i];
+		memset(copy, 0, sizeof(GLNVGpath));
+		if (path->nstroke) {
+			copy->strokeOffset = offset;
+			copy->strokeCount = path->nstroke;
+			memcpy(&gl->verts[offset], path->stroke, sizeof(NVGvertex) * path->nstroke);
+			offset += path->nstroke;
+		}
+	}
+
+	if (gl->flags & NVG_STENCIL_STROKES) {
+		// Fill shader
+		call->uniformOffset = glnvg__allocFragUniforms(gl, 2);
+		if (call->uniformOffset == -1) goto error;
+
+		glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, strokeWidth, fringe, -1.0f);
+		glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset + gl->fragSize), paint, scissor, strokeWidth, fringe, 1.0f - 0.5f/255.0f);
+
+	} else {
+		// Fill shader
+		call->uniformOffset = glnvg__allocFragUniforms(gl, 1);
+		if (call->uniformOffset == -1) goto error;
+		glnvg__convertPaint(gl, nvg__fragUniformPtr(gl, call->uniformOffset), paint, scissor, strokeWidth, fringe, -1.0f);
+	}
+
+	return;
+
+error:
+	// We get here if call alloc was ok, but something else is not.
+	// Roll back the last call to prevent drawing it.
+	if (gl->ncalls > 0) gl->ncalls--;
+}
+
+static void glnvg__renderTriangles(void* uptr, NVGpaint* paint, NVGcompositeOperationState compositeOperation, NVGscissor* scissor,
+								   const NVGvertex* verts, int nverts, float fringe)
+{
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	GLNVGcall* call = glnvg__allocCall(gl);
+	GLNVGfragUniforms* frag;
+
+	if (call == NULL) return;
+
+	call->type = GLNVG_TRIANGLES;
+	call->image = paint->image;
+	call->blendFunc = glnvg__blendCompositeOperation(compositeOperation);
+
+	// Allocate vertices for all the paths.
+	call->triangleOffset = glnvg__allocVerts(gl, nverts);
+	if (call->triangleOffset == -1) goto error;
+	call->triangleCount = nverts;
+
+	memcpy(&gl->verts[call->triangleOffset], verts, sizeof(NVGvertex) * nverts);
+
+	// Fill shader
+	call->uniformOffset = glnvg__allocFragUniforms(gl, 1);
+	if (call->uniformOffset == -1) goto error;
+	frag = nvg__fragUniformPtr(gl, call->uniformOffset);
+	glnvg__convertPaint(gl, frag, paint, scissor, 1.0f, fringe, -1.0f);
+	frag->type = NSVG_SHADER_IMG;
+
+	return;
+
+error:
+	// We get here if call alloc was ok, but something else is not.
+	// Roll back the last call to prevent drawing it.
+	if (gl->ncalls > 0) gl->ncalls--;
+}
+
+static void glnvg__renderDelete(void* uptr)
+{
+	GLNVGcontext* gl = (GLNVGcontext*)uptr;
+	int i;
+	if (gl == NULL) return;
+
+	glnvg__deleteShader(&gl->shader);
+
+#if NANOVG_GL3
+#if NANOVG_GL_USE_UNIFORMBUFFER
+	if (gl->fragBuf != 0)
+		glDeleteBuffers(1, &gl->fragBuf);
+#endif
+	if (gl->vertArr != 0)
+		glDeleteVertexArrays(1, &gl->vertArr);
+#endif
+	if (gl->vertBuf != 0)
+		glDeleteBuffers(1, &gl->vertBuf);
+
+	for (i = 0; i < gl->ntextures; i++) {
+		if (gl->textures[i].tex != 0 && (gl->textures[i].flags & NVG_IMAGE_NODELETE) == 0)
+			glDeleteTextures(1, &gl->textures[i].tex);
+	}
+	free(gl->textures);
+
+	free(gl->paths);
+	free(gl->verts);
+	free(gl->uniforms);
+	free(gl->calls);
+
+	free(gl);
+}
+
+
+#if defined NANOVG_GL2
+NVGcontext* nvgCreateGL2(int flags)
+#elif defined NANOVG_GL3
+NVGcontext* nvgCreateGL3(int flags)
+#elif defined NANOVG_GLES2
+NVGcontext* nvgCreateGLES2(int flags)
+#elif defined NANOVG_GLES3
+NVGcontext* nvgCreateGLES3(int flags)
+#endif
+{
+	NVGparams params;
+	NVGcontext* ctx = NULL;
+	GLNVGcontext* gl = (GLNVGcontext*)malloc(sizeof(GLNVGcontext));
+	if (gl == NULL) goto error;
+	memset(gl, 0, sizeof(GLNVGcontext));
+
+	memset(&params, 0, sizeof(params));
+	params.renderCreate = glnvg__renderCreate;
+	params.renderCreateTexture = glnvg__renderCreateTexture;
+	params.renderDeleteTexture = glnvg__renderDeleteTexture;
+	params.renderUpdateTexture = glnvg__renderUpdateTexture;
+	params.renderGetTextureSize = glnvg__renderGetTextureSize;
+	params.renderViewport = glnvg__renderViewport;
+	params.renderCancel = glnvg__renderCancel;
+	params.renderFlush = glnvg__renderFlush;
+	params.renderFill = glnvg__renderFill;
+	params.renderStroke = glnvg__renderStroke;
+	params.renderTriangles = glnvg__renderTriangles;
+	params.renderDelete = glnvg__renderDelete;
+	params.userPtr = gl;
+	params.edgeAntiAlias = flags & NVG_ANTIALIAS ? 1 : 0;
+
+	gl->flags = flags;
+
+	ctx = nvgCreateInternal(&params);
+	if (ctx == NULL) goto error;
+
+	return ctx;
+
+error:
+	// 'gl' is freed by nvgDeleteInternal.
+	if (ctx != NULL) nvgDeleteInternal(ctx);
+	return NULL;
+}
+
+#if defined NANOVG_GL2
+void nvgDeleteGL2(NVGcontext* ctx)
+#elif defined NANOVG_GL3
+void nvgDeleteGL3(NVGcontext* ctx)
+#elif defined NANOVG_GLES2
+void nvgDeleteGLES2(NVGcontext* ctx)
+#elif defined NANOVG_GLES3
+void nvgDeleteGLES3(NVGcontext* ctx)
+#endif
+{
+	nvgDeleteInternal(ctx);
+}
+
+#if defined NANOVG_GL2
+int nvglCreateImageFromHandleGL2(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags)
+#elif defined NANOVG_GL3
+int nvglCreateImageFromHandleGL3(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags)
+#elif defined NANOVG_GLES2
+int nvglCreateImageFromHandleGLES2(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags)
+#elif defined NANOVG_GLES3
+int nvglCreateImageFromHandleGLES3(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags)
+#endif
+{
+	GLNVGcontext* gl = (GLNVGcontext*)nvgInternalParams(ctx)->userPtr;
+	GLNVGtexture* tex = glnvg__allocTexture(gl);
+
+	if (tex == NULL) return 0;
+
+	tex->type = NVG_TEXTURE_RGBA;
+	tex->tex = textureId;
+	tex->flags = imageFlags;
+	tex->width = w;
+	tex->height = h;
+
+	return tex->id;
+}
+
+#if defined NANOVG_GL2
+GLuint nvglImageHandleGL2(NVGcontext* ctx, int image)
+#elif defined NANOVG_GL3
+GLuint nvglImageHandleGL3(NVGcontext* ctx, int image)
+#elif defined NANOVG_GLES2
+GLuint nvglImageHandleGLES2(NVGcontext* ctx, int image)
+#elif defined NANOVG_GLES3
+GLuint nvglImageHandleGLES3(NVGcontext* ctx, int image)
+#endif
+{
+	GLNVGcontext* gl = (GLNVGcontext*)nvgInternalParams(ctx)->userPtr;
+	GLNVGtexture* tex = glnvg__findTexture(gl, image);
+	return tex->tex;
+}
+
+#endif /* NANOVG_GL_IMPLEMENTATION */

nanovg/nanovg_gl_utils.h

@@ -0,0 +1,154 @@
+//
+// Copyright (c) 2009-2013 Mikko Mononen memon@inside.org
+//
+// This software is provided 'as-is', without any express or implied
+// warranty.  In no event will the authors be held liable for any damages
+// arising from the use of this software.
+// Permission is granted to anyone to use this software for any purpose,
+// including commercial applications, and to alter it and redistribute it
+// freely, subject to the following restrictions:
+// 1. The origin of this software must not be misrepresented; you must not
+//    claim that you wrote the original software. If you use this software
+//    in a product, an acknowledgment in the product documentation would be
+//    appreciated but is not required.
+// 2. Altered source versions must be plainly marked as such, and must not be
+//    misrepresented as being the original software.
+// 3. This notice may not be removed or altered from any source distribution.
+//
+#ifndef NANOVG_GL_UTILS_H
+#define NANOVG_GL_UTILS_H
+
+struct NVGLUframebuffer {
+	NVGcontext* ctx;
+	GLuint fbo;
+	GLuint rbo;
+	GLuint texture;
+	int image;
+};
+typedef struct NVGLUframebuffer NVGLUframebuffer;
+
+// Helper function to create GL frame buffer to render to.
+void nvgluBindFramebuffer(NVGLUframebuffer* fb);
+NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int w, int h, int imageFlags);
+void nvgluDeleteFramebuffer(NVGLUframebuffer* fb);
+
+#endif // NANOVG_GL_UTILS_H
+
+#ifdef NANOVG_GL_IMPLEMENTATION
+
+#if defined(NANOVG_GL3) || defined(NANOVG_GLES2) || defined(NANOVG_GLES3)
+// FBO is core in OpenGL 3>.
+#	define NANOVG_FBO_VALID 1
+#elif defined(NANOVG_GL2)
+// On OS X including glext defines FBO on GL2 too.
+#	ifdef __APPLE__
+#		include <OpenGL/glext.h>
+#		define NANOVG_FBO_VALID 1
+#	endif
+#endif
+
+static GLint defaultFBO = -1;
+
+NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int w, int h, int imageFlags)
+{
+#ifdef NANOVG_FBO_VALID
+	GLint defaultFBO;
+	GLint defaultRBO;
+	NVGLUframebuffer* fb = NULL;
+
+	glGetIntegerv(GL_FRAMEBUFFER_BINDING, &defaultFBO);
+	glGetIntegerv(GL_RENDERBUFFER_BINDING, &defaultRBO);
+
+	fb = (NVGLUframebuffer*)malloc(sizeof(NVGLUframebuffer));
+	if (fb == NULL) goto error;
+	memset(fb, 0, sizeof(NVGLUframebuffer));
+
+	fb->image = nvgCreateImageRGBA(ctx, w, h, imageFlags | NVG_IMAGE_FLIPY | NVG_IMAGE_PREMULTIPLIED, NULL);
+
+#if defined NANOVG_GL2
+	fb->texture = nvglImageHandleGL2(ctx, fb->image);
+#elif defined NANOVG_GL3
+	fb->texture = nvglImageHandleGL3(ctx, fb->image);
+#elif defined NANOVG_GLES2
+	fb->texture = nvglImageHandleGLES2(ctx, fb->image);
+#elif defined NANOVG_GLES3
+	fb->texture = nvglImageHandleGLES3(ctx, fb->image);
+#endif
+
+	fb->ctx = ctx;
+
+	// frame buffer object
+	glGenFramebuffers(1, &fb->fbo);
+	glBindFramebuffer(GL_FRAMEBUFFER, fb->fbo);
+
+	// render buffer object
+	glGenRenderbuffers(1, &fb->rbo);
+	glBindRenderbuffer(GL_RENDERBUFFER, fb->rbo);
+	glRenderbufferStorage(GL_RENDERBUFFER, GL_STENCIL_INDEX8, w, h);
+
+	// combine all
+	glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb->texture, 0);
+	glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, fb->rbo);
+
+	if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE) {
+#ifdef GL_DEPTH24_STENCIL8
+		// If GL_STENCIL_INDEX8 is not supported, try GL_DEPTH24_STENCIL8 as a fallback.
+		// Some graphics cards require a depth buffer along with a stencil.
+		glRenderbufferStorage(GL_RENDERBUFFER, GL_DEPTH24_STENCIL8, w, h);
+		glFramebufferTexture2D(GL_FRAMEBUFFER, GL_COLOR_ATTACHMENT0, GL_TEXTURE_2D, fb->texture, 0);
+		glFramebufferRenderbuffer(GL_FRAMEBUFFER, GL_STENCIL_ATTACHMENT, GL_RENDERBUFFER, fb->rbo);
+
+		if (glCheckFramebufferStatus(GL_FRAMEBUFFER) != GL_FRAMEBUFFER_COMPLETE)
+#endif // GL_DEPTH24_STENCIL8
+			goto error;
+	}
+
+	glBindFramebuffer(GL_FRAMEBUFFER, defaultFBO);
+	glBindRenderbuffer(GL_RENDERBUFFER, defaultRBO);
+	return fb;
+error:
+	glBindFramebuffer(GL_FRAMEBUFFER, defaultFBO);
+	glBindRenderbuffer(GL_RENDERBUFFER, defaultRBO);
+	nvgluDeleteFramebuffer(fb);
+	return NULL;
+#else
+	NVG_NOTUSED(ctx);
+	NVG_NOTUSED(w);
+	NVG_NOTUSED(h);
+	NVG_NOTUSED(imageFlags);
+	return NULL;
+#endif
+}
+
+void nvgluBindFramebuffer(NVGLUframebuffer* fb)
+{
+#ifdef NANOVG_FBO_VALID
+	if (defaultFBO == -1) glGetIntegerv(GL_FRAMEBUFFER_BINDING, &defaultFBO);
+	glBindFramebuffer(GL_FRAMEBUFFER, fb != NULL ? fb->fbo : defaultFBO);
+#else
+	NVG_NOTUSED(fb);
+#endif
+}
+
+void nvgluDeleteFramebuffer(NVGLUframebuffer* fb)
+{
+#ifdef NANOVG_FBO_VALID
+	if (fb == NULL) return;
+	if (fb->fbo != 0)
+		glDeleteFramebuffers(1, &fb->fbo);
+	if (fb->rbo != 0)
+		glDeleteRenderbuffers(1, &fb->rbo);
+	if (fb->image >= 0)
+		nvgDeleteImage(fb->ctx, fb->image);
+	fb->ctx = NULL;
+	fb->fbo = 0;
+	fb->rbo = 0;
+	fb->texture = 0;
+	fb->image = -1;
+	free(fb);
+#else
+	NVG_NOTUSED(fb);
+#endif
+}
+
+#endif // NANOVG_GL_IMPLEMENTATION

nanovg/stb_image.h

@@ -0,0 +1,6614 @@
+/* stb_image - v2.10 - public domain image loader - http://nothings.org/stb_image.h
+                                     no warranty implied; use at your own risk
+
+   Do this:
+      #define STB_IMAGE_IMPLEMENTATION
+   before you include this file in *one* C or C++ file to create the implementation.
+
+   // i.e. it should look like this:
+   #include ...
+   #include ...
+   #include ...
+   #define STB_IMAGE_IMPLEMENTATION
+   #include "stb_image.h"
+
+   You can #define STBI_ASSERT(x) before the #include to avoid using assert.h.
+   And #define STBI_MALLOC, STBI_REALLOC, and STBI_FREE to avoid using malloc,realloc,free
+
+
+   QUICK NOTES:
+      Primarily of interest to game developers and other people who can
+          avoid problematic images and only need the trivial interface
+
+      JPEG baseline & progressive (12 bpc/arithmetic not supported, same as stock IJG lib)
+      PNG 1/2/4/8-bit-per-channel (16 bpc not supported)
+
+      TGA (not sure what subset, if a subset)
+      BMP non-1bpp, non-RLE
+      PSD (composited view only, no extra channels, 8/16 bit-per-channel)
+
+      GIF (*comp always reports as 4-channel)
+      HDR (radiance rgbE format)
+      PIC (Softimage PIC)
+      PNM (PPM and PGM binary only)
+
+      Animated GIF still needs a proper API, but here's one way to do it:
+          http://gist.github.com/urraka/685d9a6340b26b830d49
+
+      - decode from memory or through FILE (define STBI_NO_STDIO to remove code)
+      - decode from arbitrary I/O callbacks
+      - SIMD acceleration on x86/x64 (SSE2) and ARM (NEON)
+
+   Full documentation under "DOCUMENTATION" below.
+
+
+   Revision 2.00 release notes:
+
+      - Progressive JPEG is now supported.
+
+      - PPM and PGM binary formats are now supported, thanks to Ken Miller.
+
+      - x86 platforms now make use of SSE2 SIMD instructions for
+        JPEG decoding, and ARM platforms can use NEON SIMD if requested.
+        This work was done by Fabian "ryg" Giesen. SSE2 is used by
+        default, but NEON must be enabled explicitly; see docs.
+
+        With other JPEG optimizations included in this version, we see
+        2x speedup on a JPEG on an x86 machine, and a 1.5x speedup
+        on a JPEG on an ARM machine, relative to previous versions of this
+        library. The same results will not obtain for all JPGs and for all
+        x86/ARM machines. (Note that progressive JPEGs are significantly
+        slower to decode than regular JPEGs.) This doesn't mean that this
+        is the fastest JPEG decoder in the land; rather, it brings it
+        closer to parity with standard libraries. If you want the fastest
+        decode, look elsewhere. (See "Philosophy" section of docs below.)
+
+        See final bullet items below for more info on SIMD.
+
+      - Added STBI_MALLOC, STBI_REALLOC, and STBI_FREE macros for replacing
+        the memory allocator. Unlike other STBI libraries, these macros don't
+        support a context parameter, so if you need to pass a context in to
+        the allocator, you'll have to store it in a global or a thread-local
+        variable.
+
+      - Split existing STBI_NO_HDR flag into two flags, STBI_NO_HDR and
+        STBI_NO_LINEAR.
+            STBI_NO_HDR:     suppress implementation of .hdr reader format
+            STBI_NO_LINEAR:  suppress high-dynamic-range light-linear float API
+
+      - You can suppress implementation of any of the decoders to reduce
+        your code footprint by #defining one or more of the following
+        symbols before creating the implementation.
+
+            STBI_NO_JPEG
+            STBI_NO_PNG
+            STBI_NO_BMP
+            STBI_NO_PSD
+            STBI_NO_TGA
+            STBI_NO_GIF
+            STBI_NO_HDR
+            STBI_NO_PIC
+            STBI_NO_PNM   (.ppm and .pgm)
+
+      - You can request *only* certain decoders and suppress all other ones
+        (this will be more forward-compatible, as addition of new decoders
+        doesn't require you to disable them explicitly):
+
+            STBI_ONLY_JPEG
+            STBI_ONLY_PNG
+            STBI_ONLY_BMP
+            STBI_ONLY_PSD
+            STBI_ONLY_TGA
+            STBI_ONLY_GIF
+            STBI_ONLY_HDR
+            STBI_ONLY_PIC
+            STBI_ONLY_PNM   (.ppm and .pgm)
+
+         Note that you can define multiples of these, and you will get all
+         of them ("only x" and "only y" is interpreted to mean "only x&y").
+
+       - If you use STBI_NO_PNG (or _ONLY_ without PNG), and you still
+         want the zlib decoder to be available, #define STBI_SUPPORT_ZLIB
+
+      - Compilation of all SIMD code can be suppressed with
+            #define STBI_NO_SIMD
+        It should not be necessary to disable SIMD unless you have issues
+        compiling (e.g. using an x86 compiler which doesn't support SSE
+        intrinsics or that doesn't support the method used to detect
+        SSE2 support at run-time), and even those can be reported as
+        bugs so I can refine the built-in compile-time checking to be
+        smarter.
+
+      - The old STBI_SIMD system which allowed installing a user-defined
+        IDCT etc. has been removed. If you need this, don't upgrade. My
+        assumption is that almost nobody was doing this, and those who
+        were will find the built-in SIMD more satisfactory anyway.
+
+      - RGB values computed for JPEG images are slightly different from
+        previous versions of stb_image. (This is due to using less
+        integer precision in SIMD.) The C code has been adjusted so
+        that the same RGB values will be computed regardless of whether
+        SIMD support is available, so your app should always produce
+        consistent results. But these results are slightly different from
+        previous versions. (Specifically, about 3% of available YCbCr values
+        will compute different RGB results from pre-1.49 versions by +-1;
+        most of the deviating values are one smaller in the G channel.)
+
+      - If you must produce consistent results with previous versions of
+        stb_image, #define STBI_JPEG_OLD and you will get the same results
+        you used to; however, you will not get the SIMD speedups for
+        the YCbCr-to-RGB conversion step (although you should still see
+        significant JPEG speedup from the other changes).
+
+        Please note that STBI_JPEG_OLD is a temporary feature; it will be
+        removed in future versions of the library. It is only intended for
+        near-term back-compatibility use.
+
+
+   Latest revision history:
+      2.10  (2016-01-22) avoid warning introduced in 2.09
+      2.09  (2016-01-16) 16-bit TGA; comments in PNM files; STBI_REALLOC_SIZED
+      2.08  (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA
+      2.07  (2015-09-13) partial animated GIF support
+                         limited 16-bit PSD support
+                         minor bugs, code cleanup, and compiler warnings
+      2.06  (2015-04-19) fix bug where PSD returns wrong '*comp' value
+      2.05  (2015-04-19) fix bug in progressive JPEG handling, fix warning
+      2.04  (2015-04-15) try to re-enable SIMD on MinGW 64-bit
+      2.03  (2015-04-12) additional corruption checking
+                         stbi_set_flip_vertically_on_load
+                         fix NEON support; fix mingw support
+      2.02  (2015-01-19) fix incorrect assert, fix warning
+      2.01  (2015-01-17) fix various warnings
+      2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG
+      2.00  (2014-12-25) optimize JPEG, including x86 SSE2 & ARM NEON SIMD
+                         progressive JPEG
+                         PGM/PPM support
+                         STBI_MALLOC,STBI_REALLOC,STBI_FREE
+                         STBI_NO_*, STBI_ONLY_*
+                         GIF bugfix
+      1.48  (2014-12-14) fix incorrectly-named assert()
+      1.47  (2014-12-14) 1/2/4-bit PNG support (both grayscale and paletted)
+                         optimize PNG
+                         fix bug in interlaced PNG with user-specified channel count
+
+   See end of file for full revision history.
+
+
+ ============================    Contributors    =========================
+
+ Image formats                          Extensions, features
+    Sean Barrett (jpeg, png, bmp)          Jetro Lauha (stbi_info)
+    Nicolas Schulz (hdr, psd)              Martin "SpartanJ" Golini (stbi_info)
+    Jonathan Dummer (tga)                  James "moose2000" Brown (iPhone PNG)
+    Jean-Marc Lienher (gif)                Ben "Disch" Wenger (io callbacks)
+    Tom Seddon (pic)                       Omar Cornut (1/2/4-bit PNG)
+    Thatcher Ulrich (psd)                  Nicolas Guillemot (vertical flip)
+    Ken Miller (pgm, ppm)                  Richard Mitton (16-bit PSD)
+    urraka@github (animated gif)           Junggon Kim (PNM comments)
+                                           Daniel Gibson (16-bit TGA)
+
+ Optimizations & bugfixes
+    Fabian "ryg" Giesen
+    Arseny Kapoulkine
+
+ Bug & warning fixes
+    Marc LeBlanc            David Woo          Guillaume George   Martins Mozeiko
+    Christpher Lloyd        Martin Golini      Jerry Jansson      Joseph Thomson
+    Dave Moore              Roy Eltham         Hayaki Saito       Phil Jordan
+    Won Chun                Luke Graham        Johan Duparc       Nathan Reed
+    the Horde3D community   Thomas Ruf         Ronny Chevalier    Nick Verigakis
+    Janez Zemva             John Bartholomew   Michal Cichon      svdijk@github
+    Jonathan Blow           Ken Hamada         Tero Hanninen      Baldur Karlsson
+    Laurent Gomila          Cort Stratton      Sergio Gonzalez    romigrou@github
+    Aruelien Pocheville     Thibault Reuille   Cass Everitt
+    Ryamond Barbiero        Paul Du Bois       Engin Manap
+    Blazej Dariusz Roszkowski
+    Michaelangel007@github
+
+
+LICENSE
+
+This software is in the public domain. Where that dedication is not
+recognized, you are granted a perpetual, irrevocable license to copy,
+distribute, and modify this file as you see fit.
+
+*/
+
+#ifndef STBI_INCLUDE_STB_IMAGE_H
+#define STBI_INCLUDE_STB_IMAGE_H
+
+// DOCUMENTATION
+//
+// Limitations:
+//    - no 16-bit-per-channel PNG
+//    - no 12-bit-per-channel JPEG
+//    - no JPEGs with arithmetic coding
+//    - no 1-bit BMP
+//    - GIF always returns *comp=4
+//
+// Basic usage (see HDR discussion below for HDR usage):
+//    int x,y,n;
+//    unsigned char *data = stbi_load(filename, &x, &y, &n, 0);
+//    // ... process data if not NULL ...
+//    // ... x = width, y = height, n = # 8-bit components per pixel ...
+//    // ... replace '0' with '1'..'4' to force that many components per pixel
+//    // ... but 'n' will always be the number that it would have been if you said 0
+//    stbi_image_free(data)
+//
+// Standard parameters:
+//    int *x       -- outputs image width in pixels
+//    int *y       -- outputs image height in pixels
+//    int *comp    -- outputs # of image components in image file
+//    int req_comp -- if non-zero, # of image components requested in result
+//
+// The return value from an image loader is an 'unsigned char *' which points
+// to the pixel data, or NULL on an allocation failure or if the image is
+// corrupt or invalid. The pixel data consists of *y scanlines of *x pixels,
+// with each pixel consisting of N interleaved 8-bit components; the first
+// pixel pointed to is top-left-most in the image. There is no padding between
+// image scanlines or between pixels, regardless of format. The number of
+// components N is 'req_comp' if req_comp is non-zero, or *comp otherwise.
+// If req_comp is non-zero, *comp has the number of components that _would_
+// have been output otherwise. E.g. if you set req_comp to 4, you will always
+// get RGBA output, but you can check *comp to see if it's trivially opaque
+// because e.g. there were only 3 channels in the source image.
+//
+// An output image with N components has the following components interleaved
+// in this order in each pixel:
+//
+//     N=#comp     components
+//       1           grey
+//       2           grey, alpha
+//       3           red, green, blue
+//       4           red, green, blue, alpha
+//
+// If image loading fails for any reason, the return value will be NULL,
+// and *x, *y, *comp will be unchanged. The function stbi_failure_reason()
+// can be queried for an extremely brief, end-user unfriendly explanation
+// of why the load failed. Define STBI_NO_FAILURE_STRINGS to avoid
+// compiling these strings at all, and STBI_FAILURE_USERMSG to get slightly
+// more user-friendly ones.
+//
+// Paletted PNG, BMP, GIF, and PIC images are automatically depalettized.
+//
+// ===========================================================================
+//
+// Philosophy
+//
+// stb libraries are designed with the following priorities:
+//
+//    1. easy to use
+//    2. easy to maintain
+//    3. good performance
+//
+// Sometimes I let "good performance" creep up in priority over "easy to maintain",
+// and for best performance I may provide less-easy-to-use APIs that give higher
+// performance, in addition to the easy to use ones. Nevertheless, it's important
+// to keep in mind that from the standpoint of you, a client of this library,
+// all you care about is #1 and #3, and stb libraries do not emphasize #3 above all.
+//
+// Some secondary priorities arise directly from the first two, some of which
+// make more explicit reasons why performance can't be emphasized.
+//
+//    - Portable ("ease of use")
+//    - Small footprint ("easy to maintain")
+//    - No dependencies ("ease of use")
+//
+// ===========================================================================
+//
+// I/O callbacks
+//
+// I/O callbacks allow you to read from arbitrary sources, like packaged
+// files or some other source. Data read from callbacks are processed
+// through a small internal buffer (currently 128 bytes) to try to reduce
+// overhead.
+//
+// The three functions you must define are "read" (reads some bytes of data),
+// "skip" (skips some bytes of data), "eof" (reports if the stream is at the end).
+//
+// ===========================================================================
+//
+// SIMD support
+//
+// The JPEG decoder will try to automatically use SIMD kernels on x86 when
+// supported by the compiler. For ARM Neon support, you must explicitly
+// request it.
+//
+// (The old do-it-yourself SIMD API is no longer supported in the current
+// code.)
+//
+// On x86, SSE2 will automatically be used when available based on a run-time
+// test; if not, the generic C versions are used as a fall-back. On ARM targets,
+// the typical path is to have separate builds for NEON and non-NEON devices
+// (at least this is true for iOS and Android). Therefore, the NEON support is
+// toggled by a build flag: define STBI_NEON to get NEON loops.
+//
+// The output of the JPEG decoder is slightly different from versions where
+// SIMD support was introduced (that is, for versions before 1.49). The
+// difference is only +-1 in the 8-bit RGB channels, and only on a small
+// fraction of pixels. You can force the pre-1.49 behavior by defining
+// STBI_JPEG_OLD, but this will disable some of the SIMD decoding path
+// and hence cost some performance.
+//
+// If for some reason you do not want to use any of SIMD code, or if
+// you have issues compiling it, you can disable it entirely by
+// defining STBI_NO_SIMD.
+//
+// ===========================================================================
+//
+// HDR image support   (disable by defining STBI_NO_HDR)
+//
+// stb_image now supports loading HDR images in general, and currently
+// the Radiance .HDR file format, although the support is provided
+// generically. You can still load any file through the existing interface;
+// if you attempt to load an HDR file, it will be automatically remapped to
+// LDR, assuming gamma 2.2 and an arbitrary scale factor defaulting to 1;
+// both of these constants can be reconfigured through this interface:
+//
+//     stbi_hdr_to_ldr_gamma(2.2f);
+//     stbi_hdr_to_ldr_scale(1.0f);
+//
+// (note, do not use _inverse_ constants; stbi_image will invert them
+// appropriately).
+//
+// Additionally, there is a new, parallel interface for loading files as
+// (linear) floats to preserve the full dynamic range:
+//
+//    float *data = stbi_loadf(filename, &x, &y, &n, 0);
+//
+// If you load LDR images through this interface, those images will
+// be promoted to floating point values, run through the inverse of
+// constants corresponding to the above:
+//
+//     stbi_ldr_to_hdr_scale(1.0f);
+//     stbi_ldr_to_hdr_gamma(2.2f);
+//
+// Finally, given a filename (or an open file or memory block--see header
+// file for details) containing image data, you can query for the "most
+// appropriate" interface to use (that is, whether the image is HDR or
+// not), using:
+//
+//     stbi_is_hdr(char *filename);
+//
+// ===========================================================================
+//
+// iPhone PNG support:
+//
+// By default we convert iphone-formatted PNGs back to RGB, even though
+// they are internally encoded differently. You can disable this conversion
+// by by calling stbi_convert_iphone_png_to_rgb(0), in which case
+// you will always just get the native iphone "format" through (which
+// is BGR stored in RGB).
+//
+// Call stbi_set_unpremultiply_on_load(1) as well to force a divide per
+// pixel to remove any premultiplied alpha *only* if the image file explicitly
+// says there's premultiplied data (currently only happens in iPhone images,
+// and only if iPhone convert-to-rgb processing is on).
+//
+
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif // STBI_NO_STDIO
+
+#define STBI_VERSION 1
+
+enum
+{
+   STBI_default = 0, // only used for req_comp
+
+   STBI_grey       = 1,
+   STBI_grey_alpha = 2,
+   STBI_rgb        = 3,
+   STBI_rgb_alpha  = 4
+};
+
+typedef unsigned char stbi_uc;
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#ifdef STB_IMAGE_STATIC
+#define STBIDEF static
+#else
+#define STBIDEF extern
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// PRIMARY API - works on images of any type
+//
+
+//
+// load image by filename, open file, or memory buffer
+//
+
+typedef struct
+{
+   int      (*read)  (void *user,char *data,int size);   // fill 'data' with 'size' bytes.  return number of bytes actually read
+   void     (*skip)  (void *user,int n);                 // skip the next 'n' bytes, or 'unget' the last -n bytes if negative
+   int      (*eof)   (void *user);                       // returns nonzero if we are at end of file/data
+} stbi_io_callbacks;
+
+STBIDEF stbi_uc *stbi_load               (char              const *filename,           int *x, int *y, int *comp, int req_comp);
+STBIDEF stbi_uc *stbi_load_from_memory   (stbi_uc           const *buffer, int len   , int *x, int *y, int *comp, int req_comp);
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk  , void *user, int *x, int *y, int *comp, int req_comp);
+
+#ifndef STBI_NO_STDIO
+STBIDEF stbi_uc *stbi_load_from_file  (FILE *f,                  int *x, int *y, int *comp, int req_comp);
+// for stbi_load_from_file, file pointer is left pointing immediately after image
+#endif
+
+#ifndef STBI_NO_LINEAR
+   STBIDEF float *stbi_loadf                 (char const *filename,           int *x, int *y, int *comp, int req_comp);
+   STBIDEF float *stbi_loadf_from_memory     (stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp);
+   STBIDEF float *stbi_loadf_from_callbacks  (stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp);
+
+   #ifndef STBI_NO_STDIO
+   STBIDEF float *stbi_loadf_from_file  (FILE *f,                int *x, int *y, int *comp, int req_comp);
+   #endif
+#endif
+
+#ifndef STBI_NO_HDR
+   STBIDEF void   stbi_hdr_to_ldr_gamma(float gamma);
+   STBIDEF void   stbi_hdr_to_ldr_scale(float scale);
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_LINEAR
+   STBIDEF void   stbi_ldr_to_hdr_gamma(float gamma);
+   STBIDEF void   stbi_ldr_to_hdr_scale(float scale);
+#endif // STBI_NO_LINEAR
+
+// stbi_is_hdr is always defined, but always returns false if STBI_NO_HDR
+STBIDEF int    stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user);
+STBIDEF int    stbi_is_hdr_from_memory(stbi_uc const *buffer, int len);
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_is_hdr          (char const *filename);
+STBIDEF int      stbi_is_hdr_from_file(FILE *f);
+#endif // STBI_NO_STDIO
+
+
+// get a VERY brief reason for failure
+// NOT THREADSAFE
+STBIDEF const char *stbi_failure_reason  (void);
+
+// free the loaded image -- this is just free()
+STBIDEF void     stbi_image_free      (void *retval_from_stbi_load);
+
+// get image dimensions & components without fully decoding
+STBIDEF int      stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp);
+STBIDEF int      stbi_info_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp);
+
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_info            (char const *filename,     int *x, int *y, int *comp);
+STBIDEF int      stbi_info_from_file  (FILE *f,                  int *x, int *y, int *comp);
+
+#endif
+
+
+
+// for image formats that explicitly notate that they have premultiplied alpha,
+// we just return the colors as stored in the file. set this flag to force
+// unpremultiplication. results are undefined if the unpremultiply overflow.
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply);
+
+// indicate whether we should process iphone images back to canonical format,
+// or just pass them through "as-is"
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert);
+
+// flip the image vertically, so the first pixel in the output array is the bottom left
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip);
+
+// ZLIB client - used by PNG, available for other purposes
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen);
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header);
+STBIDEF char *stbi_zlib_decode_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int   stbi_zlib_decode_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+
+STBIDEF char *stbi_zlib_decode_noheader_malloc(const char *buffer, int len, int *outlen);
+STBIDEF int   stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+//
+//
+////   end header file   /////////////////////////////////////////////////////
+#endif // STBI_INCLUDE_STB_IMAGE_H
+
+#ifdef STB_IMAGE_IMPLEMENTATION
+
+#if defined(STBI_ONLY_JPEG) || defined(STBI_ONLY_PNG) || defined(STBI_ONLY_BMP) \
+  || defined(STBI_ONLY_TGA) || defined(STBI_ONLY_GIF) || defined(STBI_ONLY_PSD) \
+  || defined(STBI_ONLY_HDR) || defined(STBI_ONLY_PIC) || defined(STBI_ONLY_PNM) \
+  || defined(STBI_ONLY_ZLIB)
+   #ifndef STBI_ONLY_JPEG
+   #define STBI_NO_JPEG
+   #endif
+   #ifndef STBI_ONLY_PNG
+   #define STBI_NO_PNG
+   #endif
+   #ifndef STBI_ONLY_BMP
+   #define STBI_NO_BMP
+   #endif
+   #ifndef STBI_ONLY_PSD
+   #define STBI_NO_PSD
+   #endif
+   #ifndef STBI_ONLY_TGA
+   #define STBI_NO_TGA
+   #endif
+   #ifndef STBI_ONLY_GIF
+   #define STBI_NO_GIF
+   #endif
+   #ifndef STBI_ONLY_HDR
+   #define STBI_NO_HDR
+   #endif
+   #ifndef STBI_ONLY_PIC
+   #define STBI_NO_PIC
+   #endif
+   #ifndef STBI_ONLY_PNM
+   #define STBI_NO_PNM
+   #endif
+#endif
+
+#if defined(STBI_NO_PNG) && !defined(STBI_SUPPORT_ZLIB) && !defined(STBI_NO_ZLIB)
+#define STBI_NO_ZLIB
+#endif
+
+
+#include <stdarg.h>
+#include <stddef.h> // ptrdiff_t on osx
+#include <stdlib.h>
+#include <string.h>
+
+#if !defined(STBI_NO_LINEAR) || !defined(STBI_NO_HDR)
+#include <math.h>  // ldexp
+#endif
+
+#ifndef STBI_NO_STDIO
+#include <stdio.h>
+#endif
+
+#ifndef STBI_ASSERT
+#include <assert.h>
+#define STBI_ASSERT(x) assert(x)
+#endif
+
+
+#ifndef _MSC_VER
+   #ifdef __cplusplus
+   #define stbi_inline inline
+   #else
+   #define stbi_inline
+   #endif
+#else
+   #define stbi_inline __forceinline
+#endif
+
+
+#ifdef _MSC_VER
+typedef unsigned short stbi__uint16;
+typedef   signed short stbi__int16;
+typedef unsigned int   stbi__uint32;
+typedef   signed int   stbi__int32;
+#else
+#include <stdint.h>
+typedef uint16_t stbi__uint16;
+typedef int16_t  stbi__int16;
+typedef uint32_t stbi__uint32;
+typedef int32_t  stbi__int32;
+#endif
+
+// should produce compiler error if size is wrong
+typedef unsigned char validate_uint32[sizeof(stbi__uint32)==4 ? 1 : -1];
+
+#ifdef _MSC_VER
+#define STBI_NOTUSED(v)  (void)(v)
+#else
+#define STBI_NOTUSED(v)  (void)sizeof(v)
+#endif
+
+#ifdef _MSC_VER
+#define STBI_HAS_LROTL
+#endif
+
+#ifdef STBI_HAS_LROTL
+   #define stbi_lrot(x,y)  _lrotl(x,y)
+#else
+   #define stbi_lrot(x,y)  (((x) << (y)) | ((x) >> (32 - (y))))
+#endif
+
+#if defined(STBI_MALLOC) && defined(STBI_FREE) && (defined(STBI_REALLOC) || defined(STBI_REALLOC_SIZED))
+// ok
+#elif !defined(STBI_MALLOC) && !defined(STBI_FREE) && !defined(STBI_REALLOC) && !defined(STBI_REALLOC_SIZED)
+// ok
+#else
+#error "Must define all or none of STBI_MALLOC, STBI_FREE, and STBI_REALLOC (or STBI_REALLOC_SIZED)."
+#endif
+
+#ifndef STBI_MALLOC
+#define STBI_MALLOC(sz)           malloc(sz)
+#define STBI_REALLOC(p,newsz)     realloc(p,newsz)
+#define STBI_FREE(p)              free(p)
+#endif
+
+#ifndef STBI_REALLOC_SIZED
+#define STBI_REALLOC_SIZED(p,oldsz,newsz) STBI_REALLOC(p,newsz)
+#endif
+
+// x86/x64 detection
+#if defined(__x86_64__) || defined(_M_X64)
+#define STBI__X64_TARGET
+#elif defined(__i386) || defined(_M_IX86)
+#define STBI__X86_TARGET
+#endif
+
+#if defined(__GNUC__) && (defined(STBI__X86_TARGET) || defined(STBI__X64_TARGET)) && !defined(__SSE2__) && !defined(STBI_NO_SIMD)
+// NOTE: not clear do we actually need this for the 64-bit path?
+// gcc doesn't support sse2 intrinsics unless you compile with -msse2,
+// (but compiling with -msse2 allows the compiler to use SSE2 everywhere;
+// this is just broken and gcc are jerks for not fixing it properly
+// http://www.virtualdub.org/blog/pivot/entry.php?id=363 )
+#define STBI_NO_SIMD
+#endif
+
+#if defined(__MINGW32__) && defined(STBI__X86_TARGET) && !defined(STBI_MINGW_ENABLE_SSE2) && !defined(STBI_NO_SIMD)
+// Note that __MINGW32__ doesn't actually mean 32-bit, so we have to avoid STBI__X64_TARGET
+//
+// 32-bit MinGW wants ESP to be 16-byte aligned, but this is not in the
+// Windows ABI and VC++ as well as Windows DLLs don't maintain that invariant.
+// As a result, enabling SSE2 on 32-bit MinGW is dangerous when not
+// simultaneously enabling "-mstackrealign".
+//
+// See https://github.com/nothings/stb/issues/81 for more information.
+//
+// So default to no SSE2 on 32-bit MinGW. If you've read this far and added
+// -mstackrealign to your build settings, feel free to #define STBI_MINGW_ENABLE_SSE2.
+#define STBI_NO_SIMD
+#endif
+
+#if !defined(STBI_NO_SIMD) && defined(STBI__X86_TARGET)
+#define STBI_SSE2
+#include <emmintrin.h>
+
+#ifdef _MSC_VER
+
+#if _MSC_VER >= 1400  // not VC6
+#include <intrin.h> // __cpuid
+static int stbi__cpuid3(void)
+{
+   int info[4];
+   __cpuid(info,1);
+   return info[3];
+}
+#else
+static int stbi__cpuid3(void)
+{
+   int res;
+   __asm {
+      mov  eax,1
+      cpuid
+      mov  res,edx
+   }
+   return res;
+}
+#endif
+
+#define STBI_SIMD_ALIGN(type, name) __declspec(align(16)) type name
+
+static int stbi__sse2_available()
+{
+   int info3 = stbi__cpuid3();
+   return ((info3 >> 26) & 1) != 0;
+}
+#else // assume GCC-style if not VC++
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+
+static int stbi__sse2_available()
+{
+#if defined(__GNUC__) && (__GNUC__ * 100 + __GNUC_MINOR__) >= 408 // GCC 4.8 or later
+   // GCC 4.8+ has a nice way to do this
+   return __builtin_cpu_supports("sse2");
+#else
+   // portable way to do this, preferably without using GCC inline ASM?
+   // just bail for now.
+   return 0;
+#endif
+}
+#endif
+#endif
+
+// ARM NEON
+#if defined(STBI_NO_SIMD) && defined(STBI_NEON)
+#undef STBI_NEON
+#endif
+
+#ifdef STBI_NEON
+#include <arm_neon.h>
+// assume GCC or Clang on ARM targets
+#define STBI_SIMD_ALIGN(type, name) type name __attribute__((aligned(16)))
+#endif
+
+#ifndef STBI_SIMD_ALIGN
+#define STBI_SIMD_ALIGN(type, name) type name
+#endif
+
+///////////////////////////////////////////////
+//
+//  stbi__context struct and start_xxx functions
+
+// stbi__context structure is our basic context used by all images, so it
+// contains all the IO context, plus some basic image information
+typedef struct
+{
+   stbi__uint32 img_x, img_y;
+   int img_n, img_out_n;
+
+   stbi_io_callbacks io;
+   void *io_user_data;
+
+   int read_from_callbacks;
+   int buflen;
+   stbi_uc buffer_start[128];
+
+   stbi_uc *img_buffer, *img_buffer_end;
+   stbi_uc *img_buffer_original, *img_buffer_original_end;
+} stbi__context;
+
+
+static void stbi__refill_buffer(stbi__context *s);
+
+// initialize a memory-decode context
+static void stbi__start_mem(stbi__context *s, stbi_uc const *buffer, int len)
+{
+   s->io.read = NULL;
+   s->read_from_callbacks = 0;
+   s->img_buffer = s->img_buffer_original = (stbi_uc *) buffer;
+   s->img_buffer_end = s->img_buffer_original_end = (stbi_uc *) buffer+len;
+}
+
+// initialize a callback-based context
+static void stbi__start_callbacks(stbi__context *s, stbi_io_callbacks *c, void *user)
+{
+   s->io = *c;
+   s->io_user_data = user;
+   s->buflen = sizeof(s->buffer_start);
+   s->read_from_callbacks = 1;
+   s->img_buffer_original = s->buffer_start;
+   stbi__refill_buffer(s);
+   s->img_buffer_original_end = s->img_buffer_end;
+}
+
+#ifndef STBI_NO_STDIO
+
+static int stbi__stdio_read(void *user, char *data, int size)
+{
+   return (int) fread(data,1,size,(FILE*) user);
+}
+
+static void stbi__stdio_skip(void *user, int n)
+{
+   fseek((FILE*) user, n, SEEK_CUR);
+}
+
+static int stbi__stdio_eof(void *user)
+{
+   return feof((FILE*) user);
+}
+
+static stbi_io_callbacks stbi__stdio_callbacks =
+{
+   stbi__stdio_read,
+   stbi__stdio_skip,
+   stbi__stdio_eof,
+};
+
+static void stbi__start_file(stbi__context *s, FILE *f)
+{
+   stbi__start_callbacks(s, &stbi__stdio_callbacks, (void *) f);
+}
+
+//static void stop_file(stbi__context *s) { }
+
+#endif // !STBI_NO_STDIO
+
+static void stbi__rewind(stbi__context *s)
+{
+   // conceptually rewind SHOULD rewind to the beginning of the stream,
+   // but we just rewind to the beginning of the initial buffer, because
+   // we only use it after doing 'test', which only ever looks at at most 92 bytes
+   s->img_buffer = s->img_buffer_original;
+   s->img_buffer_end = s->img_buffer_original_end;
+}
+
+#ifndef STBI_NO_JPEG
+static int      stbi__jpeg_test(stbi__context *s);
+static stbi_uc *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PNG
+static int      stbi__png_test(stbi__context *s);
+static stbi_uc *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__png_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_BMP
+static int      stbi__bmp_test(stbi__context *s);
+static stbi_uc *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_TGA
+static int      stbi__tga_test(stbi__context *s);
+static stbi_uc *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__tga_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PSD
+static int      stbi__psd_test(stbi__context *s);
+static stbi_uc *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__psd_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_HDR
+static int      stbi__hdr_test(stbi__context *s);
+static float   *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PIC
+static int      stbi__pic_test(stbi__context *s);
+static stbi_uc *stbi__pic_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__pic_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_GIF
+static int      stbi__gif_test(stbi__context *s);
+static stbi_uc *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__gif_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+#ifndef STBI_NO_PNM
+static int      stbi__pnm_test(stbi__context *s);
+static stbi_uc *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp);
+static int      stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp);
+#endif
+
+// this is not threadsafe
+static const char *stbi__g_failure_reason;
+
+STBIDEF const char *stbi_failure_reason(void)
+{
+   return stbi__g_failure_reason;
+}
+
+static int stbi__err(const char *str)
+{
+   stbi__g_failure_reason = str;
+   return 0;
+}
+
+static void *stbi__malloc(size_t size)
+{
+    return STBI_MALLOC(size);
+}
+
+// stbi__err - error
+// stbi__errpf - error returning pointer to float
+// stbi__errpuc - error returning pointer to unsigned char
+
+#ifdef STBI_NO_FAILURE_STRINGS
+   #define stbi__err(x,y)  0
+#elif defined(STBI_FAILURE_USERMSG)
+   #define stbi__err(x,y)  stbi__err(y)
+#else
+   #define stbi__err(x,y)  stbi__err(x)
+#endif
+
+#define stbi__errpf(x,y)   ((float *)(size_t) (stbi__err(x,y)?NULL:NULL))
+#define stbi__errpuc(x,y)  ((unsigned char *)(size_t) (stbi__err(x,y)?NULL:NULL))
+
+STBIDEF void stbi_image_free(void *retval_from_stbi_load)
+{
+   STBI_FREE(retval_from_stbi_load);
+}
+
+#ifndef STBI_NO_LINEAR
+static float   *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp);
+#endif
+
+#ifndef STBI_NO_HDR
+static stbi_uc *stbi__hdr_to_ldr(float   *data, int x, int y, int comp);
+#endif
+
+static int stbi__vertically_flip_on_load = 0;
+
+STBIDEF void stbi_set_flip_vertically_on_load(int flag_true_if_should_flip)
+{
+    stbi__vertically_flip_on_load = flag_true_if_should_flip;
+}
+
+static unsigned char *stbi__load_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   #ifndef STBI_NO_JPEG
+   if (stbi__jpeg_test(s)) return stbi__jpeg_load(s,x,y,comp,req_comp);
+   #endif
+   #ifndef STBI_NO_PNG
+   if (stbi__png_test(s))  return stbi__png_load(s,x,y,comp,req_comp);
+   #endif
+   #ifndef STBI_NO_BMP
+   if (stbi__bmp_test(s))  return stbi__bmp_load(s,x,y,comp,req_comp);
+   #endif
+   #ifndef STBI_NO_GIF
+   if (stbi__gif_test(s))  return stbi__gif_load(s,x,y,comp,req_comp);
+   #endif
+   #ifndef STBI_NO_PSD
+   if (stbi__psd_test(s))  return stbi__psd_load(s,x,y,comp,req_comp);
+   #endif
+   #ifndef STBI_NO_PIC
+   if (stbi__pic_test(s))  return stbi__pic_load(s,x,y,comp,req_comp);
+   #endif
+   #ifndef STBI_NO_PNM
+   if (stbi__pnm_test(s))  return stbi__pnm_load(s,x,y,comp,req_comp);
+   #endif
+
+   #ifndef STBI_NO_HDR
+   if (stbi__hdr_test(s)) {
+      float *hdr = stbi__hdr_load(s, x,y,comp,req_comp);
+      return stbi__hdr_to_ldr(hdr, *x, *y, req_comp ? req_comp : *comp);
+   }
+   #endif
+
+   #ifndef STBI_NO_TGA
+   // test tga last because it's a crappy test!
+   if (stbi__tga_test(s))
+      return stbi__tga_load(s,x,y,comp,req_comp);
+   #endif
+
+   return stbi__errpuc("unknown image type", "Image not of any known type, or corrupt");
+}
+
+static unsigned char *stbi__load_flip(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   unsigned char *result = stbi__load_main(s, x, y, comp, req_comp);
+
+   if (stbi__vertically_flip_on_load && result != NULL) {
+      int w = *x, h = *y;
+      int depth = req_comp ? req_comp : *comp;
+      int row,col,z;
+      stbi_uc temp;
+
+      // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once
+      for (row = 0; row < (h>>1); row++) {
+         for (col = 0; col < w; col++) {
+            for (z = 0; z < depth; z++) {
+               temp = result[(row * w + col) * depth + z];
+               result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z];
+               result[((h - row - 1) * w + col) * depth + z] = temp;
+            }
+         }
+      }
+   }
+
+   return result;
+}
+
+#ifndef STBI_NO_HDR
+static void stbi__float_postprocess(float *result, int *x, int *y, int *comp, int req_comp)
+{
+   if (stbi__vertically_flip_on_load && result != NULL) {
+      int w = *x, h = *y;
+      int depth = req_comp ? req_comp : *comp;
+      int row,col,z;
+      float temp;
+
+      // @OPTIMIZE: use a bigger temp buffer and memcpy multiple pixels at once
+      for (row = 0; row < (h>>1); row++) {
+         for (col = 0; col < w; col++) {
+            for (z = 0; z < depth; z++) {
+               temp = result[(row * w + col) * depth + z];
+               result[(row * w + col) * depth + z] = result[((h - row - 1) * w + col) * depth + z];
+               result[((h - row - 1) * w + col) * depth + z] = temp;
+            }
+         }
+      }
+   }
+}
+#endif
+
+#ifndef STBI_NO_STDIO
+
+static FILE *stbi__fopen(char const *filename, char const *mode)
+{
+   FILE *f;
+#if defined(_MSC_VER) && _MSC_VER >= 1400
+   if (0 != fopen_s(&f, filename, mode))
+      f=0;
+#else
+   f = fopen(filename, mode);
+#endif
+   return f;
+}
+
+
+STBIDEF stbi_uc *stbi_load(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+   FILE *f = stbi__fopen(filename, "rb");
+   unsigned char *result;
+   if (!f) return stbi__errpuc("can't fopen", "Unable to open file");
+   result = stbi_load_from_file(f,x,y,comp,req_comp);
+   fclose(f);
+   return result;
+}
+
+STBIDEF stbi_uc *stbi_load_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+   unsigned char *result;
+   stbi__context s;
+   stbi__start_file(&s,f);
+   result = stbi__load_flip(&s,x,y,comp,req_comp);
+   if (result) {
+      // need to 'unget' all the characters in the IO buffer
+      fseek(f, - (int) (s.img_buffer_end - s.img_buffer), SEEK_CUR);
+   }
+   return result;
+}
+#endif //!STBI_NO_STDIO
+
+STBIDEF stbi_uc *stbi_load_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__load_flip(&s,x,y,comp,req_comp);
+}
+
+STBIDEF stbi_uc *stbi_load_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+   return stbi__load_flip(&s,x,y,comp,req_comp);
+}
+
+#ifndef STBI_NO_LINEAR
+static float *stbi__loadf_main(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   unsigned char *data;
+   #ifndef STBI_NO_HDR
+   if (stbi__hdr_test(s)) {
+      float *hdr_data = stbi__hdr_load(s,x,y,comp,req_comp);
+      if (hdr_data)
+         stbi__float_postprocess(hdr_data,x,y,comp,req_comp);
+      return hdr_data;
+   }
+   #endif
+   data = stbi__load_flip(s, x, y, comp, req_comp);
+   if (data)
+      return stbi__ldr_to_hdr(data, *x, *y, req_comp ? req_comp : *comp);
+   return stbi__errpf("unknown image type", "Image not of any known type, or corrupt");
+}
+
+STBIDEF float *stbi_loadf_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+
+STBIDEF float *stbi_loadf_from_callbacks(stbi_io_callbacks const *clbk, void *user, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+   return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF float *stbi_loadf(char const *filename, int *x, int *y, int *comp, int req_comp)
+{
+   float *result;
+   FILE *f = stbi__fopen(filename, "rb");
+   if (!f) return stbi__errpf("can't fopen", "Unable to open file");
+   result = stbi_loadf_from_file(f,x,y,comp,req_comp);
+   fclose(f);
+   return result;
+}
+
+STBIDEF float *stbi_loadf_from_file(FILE *f, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__context s;
+   stbi__start_file(&s,f);
+   return stbi__loadf_main(&s,x,y,comp,req_comp);
+}
+#endif // !STBI_NO_STDIO
+
+#endif // !STBI_NO_LINEAR
+
+// these is-hdr-or-not is defined independent of whether STBI_NO_LINEAR is
+// defined, for API simplicity; if STBI_NO_LINEAR is defined, it always
+// reports false!
+
+STBIDEF int stbi_is_hdr_from_memory(stbi_uc const *buffer, int len)
+{
+   #ifndef STBI_NO_HDR
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__hdr_test(&s);
+   #else
+   STBI_NOTUSED(buffer);
+   STBI_NOTUSED(len);
+   return 0;
+   #endif
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int      stbi_is_hdr          (char const *filename)
+{
+   FILE *f = stbi__fopen(filename, "rb");
+   int result=0;
+   if (f) {
+      result = stbi_is_hdr_from_file(f);
+      fclose(f);
+   }
+   return result;
+}
+
+STBIDEF int      stbi_is_hdr_from_file(FILE *f)
+{
+   #ifndef STBI_NO_HDR
+   stbi__context s;
+   stbi__start_file(&s,f);
+   return stbi__hdr_test(&s);
+   #else
+   STBI_NOTUSED(f);
+   return 0;
+   #endif
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int      stbi_is_hdr_from_callbacks(stbi_io_callbacks const *clbk, void *user)
+{
+   #ifndef STBI_NO_HDR
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) clbk, user);
+   return stbi__hdr_test(&s);
+   #else
+   STBI_NOTUSED(clbk);
+   STBI_NOTUSED(user);
+   return 0;
+   #endif
+}
+
+#ifndef STBI_NO_LINEAR
+static float stbi__l2h_gamma=2.2f, stbi__l2h_scale=1.0f;
+
+STBIDEF void   stbi_ldr_to_hdr_gamma(float gamma) { stbi__l2h_gamma = gamma; }
+STBIDEF void   stbi_ldr_to_hdr_scale(float scale) { stbi__l2h_scale = scale; }
+#endif
+
+static float stbi__h2l_gamma_i=1.0f/2.2f, stbi__h2l_scale_i=1.0f;
+
+STBIDEF void   stbi_hdr_to_ldr_gamma(float gamma) { stbi__h2l_gamma_i = 1/gamma; }
+STBIDEF void   stbi_hdr_to_ldr_scale(float scale) { stbi__h2l_scale_i = 1/scale; }
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Common code used by all image loaders
+//
+
+enum
+{
+   STBI__SCAN_load=0,
+   STBI__SCAN_type,
+   STBI__SCAN_header
+};
+
+static void stbi__refill_buffer(stbi__context *s)
+{
+   int n = (s->io.read)(s->io_user_data,(char*)s->buffer_start,s->buflen);
+   if (n == 0) {
+      // at end of file, treat same as if from memory, but need to handle case
+      // where s->img_buffer isn't pointing to safe memory, e.g. 0-byte file
+      s->read_from_callbacks = 0;
+      s->img_buffer = s->buffer_start;
+      s->img_buffer_end = s->buffer_start+1;
+      *s->img_buffer = 0;
+   } else {
+      s->img_buffer = s->buffer_start;
+      s->img_buffer_end = s->buffer_start + n;
+   }
+}
+
+stbi_inline static stbi_uc stbi__get8(stbi__context *s)
+{
+   if (s->img_buffer < s->img_buffer_end)
+      return *s->img_buffer++;
+   if (s->read_from_callbacks) {
+      stbi__refill_buffer(s);
+      return *s->img_buffer++;
+   }
+   return 0;
+}
+
+stbi_inline static int stbi__at_eof(stbi__context *s)
+{
+   if (s->io.read) {
+      if (!(s->io.eof)(s->io_user_data)) return 0;
+      // if feof() is true, check if buffer = end
+      // special case: we've only got the special 0 character at the end
+      if (s->read_from_callbacks == 0) return 1;
+   }
+
+   return s->img_buffer >= s->img_buffer_end;
+}
+
+static void stbi__skip(stbi__context *s, int n)
+{
+   if (n < 0) {
+      s->img_buffer = s->img_buffer_end;
+      return;
+   }
+   if (s->io.read) {
+      int blen = (int) (s->img_buffer_end - s->img_buffer);
+      if (blen < n) {
+         s->img_buffer = s->img_buffer_end;
+         (s->io.skip)(s->io_user_data, n - blen);
+         return;
+      }
+   }
+   s->img_buffer += n;
+}
+
+static int stbi__getn(stbi__context *s, stbi_uc *buffer, int n)
+{
+   if (s->io.read) {
+      int blen = (int) (s->img_buffer_end - s->img_buffer);
+      if (blen < n) {
+         int res, count;
+
+         memcpy(buffer, s->img_buffer, blen);
+
+         count = (s->io.read)(s->io_user_data, (char*) buffer + blen, n - blen);
+         res = (count == (n-blen));
+         s->img_buffer = s->img_buffer_end;
+         return res;
+      }
+   }
+
+   if (s->img_buffer+n <= s->img_buffer_end) {
+      memcpy(buffer, s->img_buffer, n);
+      s->img_buffer += n;
+      return 1;
+   } else
+      return 0;
+}
+
+static int stbi__get16be(stbi__context *s)
+{
+   int z = stbi__get8(s);
+   return (z << 8) + stbi__get8(s);
+}
+
+static stbi__uint32 stbi__get32be(stbi__context *s)
+{
+   stbi__uint32 z = stbi__get16be(s);
+   return (z << 16) + stbi__get16be(s);
+}
+
+#if defined(STBI_NO_BMP) && defined(STBI_NO_TGA) && defined(STBI_NO_GIF)
+// nothing
+#else
+static int stbi__get16le(stbi__context *s)
+{
+   int z = stbi__get8(s);
+   return z + (stbi__get8(s) << 8);
+}
+#endif
+
+#ifndef STBI_NO_BMP
+static stbi__uint32 stbi__get32le(stbi__context *s)
+{
+   stbi__uint32 z = stbi__get16le(s);
+   return z + (stbi__get16le(s) << 16);
+}
+#endif
+
+#define STBI__BYTECAST(x)  ((stbi_uc) ((x) & 255))  // truncate int to byte without warnings
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//  generic converter from built-in img_n to req_comp
+//    individual types do this automatically as much as possible (e.g. jpeg
+//    does all cases internally since it needs to colorspace convert anyway,
+//    and it never has alpha, so very few cases ). png can automatically
+//    interleave an alpha=255 channel, but falls back to this for other cases
+//
+//  assume data buffer is malloced, so malloc a new one and free that one
+//  only failure mode is malloc failing
+
+static stbi_uc stbi__compute_y(int r, int g, int b)
+{
+   return (stbi_uc) (((r*77) + (g*150) +  (29*b)) >> 8);
+}
+
+static unsigned char *stbi__convert_format(unsigned char *data, int img_n, int req_comp, unsigned int x, unsigned int y)
+{
+   int i,j;
+   unsigned char *good;
+
+   if (req_comp == img_n) return data;
+   STBI_ASSERT(req_comp >= 1 && req_comp <= 4);
+
+   good = (unsigned char *) stbi__malloc(req_comp * x * y);
+   if (good == NULL) {
+      STBI_FREE(data);
+      return stbi__errpuc("outofmem", "Out of memory");
+   }
+
+   for (j=0; j < (int) y; ++j) {
+      unsigned char *src  = data + j * x * img_n   ;
+      unsigned char *dest = good + j * x * req_comp;
+
+      #define COMBO(a,b)  ((a)*8+(b))
+      #define CASE(a,b)   case COMBO(a,b): for(i=x-1; i >= 0; --i, src += a, dest += b)
+      // convert source image with img_n components to one with req_comp components;
+      // avoid switch per pixel, so use switch per scanline and massive macros
+      switch (COMBO(img_n, req_comp)) {
+         CASE(1,2) dest[0]=src[0], dest[1]=255; break;
+         CASE(1,3) dest[0]=dest[1]=dest[2]=src[0]; break;
+         CASE(1,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=255; break;
+         CASE(2,1) dest[0]=src[0]; break;
+         CASE(2,3) dest[0]=dest[1]=dest[2]=src[0]; break;
+         CASE(2,4) dest[0]=dest[1]=dest[2]=src[0], dest[3]=src[1]; break;
+         CASE(3,4) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2],dest[3]=255; break;
+         CASE(3,1) dest[0]=stbi__compute_y(src[0],src[1],src[2]); break;
+         CASE(3,2) dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = 255; break;
+         CASE(4,1) dest[0]=stbi__compute_y(src[0],src[1],src[2]); break;
+         CASE(4,2) dest[0]=stbi__compute_y(src[0],src[1],src[2]), dest[1] = src[3]; break;
+         CASE(4,3) dest[0]=src[0],dest[1]=src[1],dest[2]=src[2]; break;
+         default: STBI_ASSERT(0);
+      }
+      #undef CASE
+   }
+
+   STBI_FREE(data);
+   return good;
+}
+
+#ifndef STBI_NO_LINEAR
+static float   *stbi__ldr_to_hdr(stbi_uc *data, int x, int y, int comp)
+{
+   int i,k,n;
+   float *output = (float *) stbi__malloc(x * y * comp * sizeof(float));
+   if (output == NULL) { STBI_FREE(data); return stbi__errpf("outofmem", "Out of memory"); }
+   // compute number of non-alpha components
+   if (comp & 1) n = comp; else n = comp-1;
+   for (i=0; i < x*y; ++i) {
+      for (k=0; k < n; ++k) {
+         output[i*comp + k] = (float) (pow(data[i*comp+k]/255.0f, stbi__l2h_gamma) * stbi__l2h_scale);
+      }
+      if (k < comp) output[i*comp + k] = data[i*comp+k]/255.0f;
+   }
+   STBI_FREE(data);
+   return output;
+}
+#endif
+
+#ifndef STBI_NO_HDR
+#define stbi__float2int(x)   ((int) (x))
+static stbi_uc *stbi__hdr_to_ldr(float   *data, int x, int y, int comp)
+{
+   int i,k,n;
+   stbi_uc *output = (stbi_uc *) stbi__malloc(x * y * comp);
+   if (output == NULL) { STBI_FREE(data); return stbi__errpuc("outofmem", "Out of memory"); }
+   // compute number of non-alpha components
+   if (comp & 1) n = comp; else n = comp-1;
+   for (i=0; i < x*y; ++i) {
+      for (k=0; k < n; ++k) {
+         float z = (float) pow(data[i*comp+k]*stbi__h2l_scale_i, stbi__h2l_gamma_i) * 255 + 0.5f;
+         if (z < 0) z = 0;
+         if (z > 255) z = 255;
+         output[i*comp + k] = (stbi_uc) stbi__float2int(z);
+      }
+      if (k < comp) {
+         float z = data[i*comp+k] * 255 + 0.5f;
+         if (z < 0) z = 0;
+         if (z > 255) z = 255;
+         output[i*comp + k] = (stbi_uc) stbi__float2int(z);
+      }
+   }
+   STBI_FREE(data);
+   return output;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//  "baseline" JPEG/JFIF decoder
+//
+//    simple implementation
+//      - doesn't support delayed output of y-dimension
+//      - simple interface (only one output format: 8-bit interleaved RGB)
+//      - doesn't try to recover corrupt jpegs
+//      - doesn't allow partial loading, loading multiple at once
+//      - still fast on x86 (copying globals into locals doesn't help x86)
+//      - allocates lots of intermediate memory (full size of all components)
+//        - non-interleaved case requires this anyway
+//        - allows good upsampling (see next)
+//    high-quality
+//      - upsampled channels are bilinearly interpolated, even across blocks
+//      - quality integer IDCT derived from IJG's 'slow'
+//    performance
+//      - fast huffman; reasonable integer IDCT
+//      - some SIMD kernels for common paths on targets with SSE2/NEON
+//      - uses a lot of intermediate memory, could cache poorly
+
+#ifndef STBI_NO_JPEG
+
+// huffman decoding acceleration
+#define FAST_BITS   9  // larger handles more cases; smaller stomps less cache
+
+typedef struct
+{
+   stbi_uc  fast[1 << FAST_BITS];
+   // weirdly, repacking this into AoS is a 10% speed loss, instead of a win
+   stbi__uint16 code[256];
+   stbi_uc  values[256];
+   stbi_uc  size[257];
+   unsigned int maxcode[18];
+   int    delta[17];   // old 'firstsymbol' - old 'firstcode'
+} stbi__huffman;
+
+typedef struct
+{
+   stbi__context *s;
+   stbi__huffman huff_dc[4];
+   stbi__huffman huff_ac[4];
+   stbi_uc dequant[4][64];
+   stbi__int16 fast_ac[4][1 << FAST_BITS];
+
+// sizes for components, interleaved MCUs
+   int img_h_max, img_v_max;
+   int img_mcu_x, img_mcu_y;
+   int img_mcu_w, img_mcu_h;
+
+// definition of jpeg image component
+   struct
+   {
+      int id;
+      int h,v;
+      int tq;
+      int hd,ha;
+      int dc_pred;
+
+      int x,y,w2,h2;
+      stbi_uc *data;
+      void *raw_data, *raw_coeff;
+      stbi_uc *linebuf;
+      short   *coeff;   // progressive only
+      int      coeff_w, coeff_h; // number of 8x8 coefficient blocks
+   } img_comp[4];
+
+   stbi__uint32   code_buffer; // jpeg entropy-coded buffer
+   int            code_bits;   // number of valid bits
+   unsigned char  marker;      // marker seen while filling entropy buffer
+   int            nomore;      // flag if we saw a marker so must stop
+
+   int            progressive;
+   int            spec_start;
+   int            spec_end;
+   int            succ_high;
+   int            succ_low;
+   int            eob_run;
+
+   int scan_n, order[4];
+   int restart_interval, todo;
+
+// kernels
+   void (*idct_block_kernel)(stbi_uc *out, int out_stride, short data[64]);
+   void (*YCbCr_to_RGB_kernel)(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step);
+   stbi_uc *(*resample_row_hv_2_kernel)(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs);
+} stbi__jpeg;
+
+static int stbi__build_huffman(stbi__huffman *h, int *count)
+{
+   int i,j,k=0,code;
+   // build size list for each symbol (from JPEG spec)
+   for (i=0; i < 16; ++i)
+      for (j=0; j < count[i]; ++j)
+         h->size[k++] = (stbi_uc) (i+1);
+   h->size[k] = 0;
+
+   // compute actual symbols (from jpeg spec)
+   code = 0;
+   k = 0;
+   for(j=1; j <= 16; ++j) {
+      // compute delta to add to code to compute symbol id
+      h->delta[j] = k - code;
+      if (h->size[k] == j) {
+         while (h->size[k] == j)
+            h->code[k++] = (stbi__uint16) (code++);
+         if (code-1 >= (1 << j)) return stbi__err("bad code lengths","Corrupt JPEG");
+      }
+      // compute largest code + 1 for this size, preshifted as needed later
+      h->maxcode[j] = code << (16-j);
+      code <<= 1;
+   }
+   h->maxcode[j] = 0xffffffff;
+
+   // build non-spec acceleration table; 255 is flag for not-accelerated
+   memset(h->fast, 255, 1 << FAST_BITS);
+   for (i=0; i < k; ++i) {
+      int s = h->size[i];
+      if (s <= FAST_BITS) {
+         int c = h->code[i] << (FAST_BITS-s);
+         int m = 1 << (FAST_BITS-s);
+         for (j=0; j < m; ++j) {
+            h->fast[c+j] = (stbi_uc) i;
+         }
+      }
+   }
+   return 1;
+}
+
+// build a table that decodes both magnitude and value of small ACs in
+// one go.
+static void stbi__build_fast_ac(stbi__int16 *fast_ac, stbi__huffman *h)
+{
+   int i;
+   for (i=0; i < (1 << FAST_BITS); ++i) {
+      stbi_uc fast = h->fast[i];
+      fast_ac[i] = 0;
+      if (fast < 255) {
+         int rs = h->values[fast];
+         int run = (rs >> 4) & 15;
+         int magbits = rs & 15;
+         int len = h->size[fast];
+
+         if (magbits && len + magbits <= FAST_BITS) {
+            // magnitude code followed by receive_extend code
+            int k = ((i << len) & ((1 << FAST_BITS) - 1)) >> (FAST_BITS - magbits);
+            int m = 1 << (magbits - 1);
+            if (k < m) k += (-1 << magbits) + 1;
+            // if the result is small enough, we can fit it in fast_ac table
+            if (k >= -128 && k <= 127)
+               fast_ac[i] = (stbi__int16) ((k << 8) + (run << 4) + (len + magbits));
+         }
+      }
+   }
+}
+
+static void stbi__grow_buffer_unsafe(stbi__jpeg *j)
+{
+   do {
+      int b = j->nomore ? 0 : stbi__get8(j->s);
+      if (b == 0xff) {
+         int c = stbi__get8(j->s);
+         if (c != 0) {
+            j->marker = (unsigned char) c;
+            j->nomore = 1;
+            return;
+         }
+      }
+      j->code_buffer |= b << (24 - j->code_bits);
+      j->code_bits += 8;
+   } while (j->code_bits <= 24);
+}
+
+// (1 << n) - 1
+static stbi__uint32 stbi__bmask[17]={0,1,3,7,15,31,63,127,255,511,1023,2047,4095,8191,16383,32767,65535};
+
+// decode a jpeg huffman value from the bitstream
+stbi_inline static int stbi__jpeg_huff_decode(stbi__jpeg *j, stbi__huffman *h)
+{
+   unsigned int temp;
+   int c,k;
+
+   if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+
+   // look at the top FAST_BITS and determine what symbol ID it is,
+   // if the code is <= FAST_BITS
+   c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+   k = h->fast[c];
+   if (k < 255) {
+      int s = h->size[k];
+      if (s > j->code_bits)
+         return -1;
+      j->code_buffer <<= s;
+      j->code_bits -= s;
+      return h->values[k];
+   }
+
+   // naive test is to shift the code_buffer down so k bits are
+   // valid, then test against maxcode. To speed this up, we've
+   // preshifted maxcode left so that it has (16-k) 0s at the
+   // end; in other words, regardless of the number of bits, it
+   // wants to be compared against something shifted to have 16;
+   // that way we don't need to shift inside the loop.
+   temp = j->code_buffer >> 16;
+   for (k=FAST_BITS+1 ; ; ++k)
+      if (temp < h->maxcode[k])
+         break;
+   if (k == 17) {
+      // error! code not found
+      j->code_bits -= 16;
+      return -1;
+   }
+
+   if (k > j->code_bits)
+      return -1;
+
+   // convert the huffman code to the symbol id
+   c = ((j->code_buffer >> (32 - k)) & stbi__bmask[k]) + h->delta[k];
+   STBI_ASSERT((((j->code_buffer) >> (32 - h->size[c])) & stbi__bmask[h->size[c]]) == h->code[c]);
+
+   // convert the id to a symbol
+   j->code_bits -= k;
+   j->code_buffer <<= k;
+   return h->values[c];
+}
+
+// bias[n] = (-1<<n) + 1
+static int const stbi__jbias[16] = {0,-1,-3,-7,-15,-31,-63,-127,-255,-511,-1023,-2047,-4095,-8191,-16383,-32767};
+
+// combined JPEG 'receive' and JPEG 'extend', since baseline
+// always extends everything it receives.
+stbi_inline static int stbi__extend_receive(stbi__jpeg *j, int n)
+{
+   unsigned int k;
+   int sgn;
+   if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+
+   sgn = (stbi__int32)j->code_buffer >> 31; // sign bit is always in MSB
+   k = stbi_lrot(j->code_buffer, n);
+   STBI_ASSERT(n >= 0 && n < (int) (sizeof(stbi__bmask)/sizeof(*stbi__bmask)));
+   j->code_buffer = k & ~stbi__bmask[n];
+   k &= stbi__bmask[n];
+   j->code_bits -= n;
+   return k + (stbi__jbias[n] & ~sgn);
+}
+
+// get some unsigned bits
+stbi_inline static int stbi__jpeg_get_bits(stbi__jpeg *j, int n)
+{
+   unsigned int k;
+   if (j->code_bits < n) stbi__grow_buffer_unsafe(j);
+   k = stbi_lrot(j->code_buffer, n);
+   j->code_buffer = k & ~stbi__bmask[n];
+   k &= stbi__bmask[n];
+   j->code_bits -= n;
+   return k;
+}
+
+stbi_inline static int stbi__jpeg_get_bit(stbi__jpeg *j)
+{
+   unsigned int k;
+   if (j->code_bits < 1) stbi__grow_buffer_unsafe(j);
+   k = j->code_buffer;
+   j->code_buffer <<= 1;
+   --j->code_bits;
+   return k & 0x80000000;
+}
+
+// given a value that's at position X in the zigzag stream,
+// where does it appear in the 8x8 matrix coded as row-major?
+static stbi_uc stbi__jpeg_dezigzag[64+15] =
+{
+    0,  1,  8, 16,  9,  2,  3, 10,
+   17, 24, 32, 25, 18, 11,  4,  5,
+   12, 19, 26, 33, 40, 48, 41, 34,
+   27, 20, 13,  6,  7, 14, 21, 28,
+   35, 42, 49, 56, 57, 50, 43, 36,
+   29, 22, 15, 23, 30, 37, 44, 51,
+   58, 59, 52, 45, 38, 31, 39, 46,
+   53, 60, 61, 54, 47, 55, 62, 63,
+   // let corrupt input sample past end
+   63, 63, 63, 63, 63, 63, 63, 63,
+   63, 63, 63, 63, 63, 63, 63
+};
+
+// decode one 64-entry block--
+static int stbi__jpeg_decode_block(stbi__jpeg *j, short data[64], stbi__huffman *hdc, stbi__huffman *hac, stbi__int16 *fac, int b, stbi_uc *dequant)
+{
+   int diff,dc,k;
+   int t;
+
+   if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+   t = stbi__jpeg_huff_decode(j, hdc);
+   if (t < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+
+   // 0 all the ac values now so we can do it 32-bits at a time
+   memset(data,0,64*sizeof(data[0]));
+
+   diff = t ? stbi__extend_receive(j, t) : 0;
+   dc = j->img_comp[b].dc_pred + diff;
+   j->img_comp[b].dc_pred = dc;
+   data[0] = (short) (dc * dequant[0]);
+
+   // decode AC components, see JPEG spec
+   k = 1;
+   do {
+      unsigned int zig;
+      int c,r,s;
+      if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+      c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+      r = fac[c];
+      if (r) { // fast-AC path
+         k += (r >> 4) & 15; // run
+         s = r & 15; // combined length
+         j->code_buffer <<= s;
+         j->code_bits -= s;
+         // decode into unzigzag'd location
+         zig = stbi__jpeg_dezigzag[k++];
+         data[zig] = (short) ((r >> 8) * dequant[zig]);
+      } else {
+         int rs = stbi__jpeg_huff_decode(j, hac);
+         if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+         s = rs & 15;
+         r = rs >> 4;
+         if (s == 0) {
+            if (rs != 0xf0) break; // end block
+            k += 16;
+         } else {
+            k += r;
+            // decode into unzigzag'd location
+            zig = stbi__jpeg_dezigzag[k++];
+            data[zig] = (short) (stbi__extend_receive(j,s) * dequant[zig]);
+         }
+      }
+   } while (k < 64);
+   return 1;
+}
+
+static int stbi__jpeg_decode_block_prog_dc(stbi__jpeg *j, short data[64], stbi__huffman *hdc, int b)
+{
+   int diff,dc;
+   int t;
+   if (j->spec_end != 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+
+   if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+
+   if (j->succ_high == 0) {
+      // first scan for DC coefficient, must be first
+      memset(data,0,64*sizeof(data[0])); // 0 all the ac values now
+      t = stbi__jpeg_huff_decode(j, hdc);
+      diff = t ? stbi__extend_receive(j, t) : 0;
+
+      dc = j->img_comp[b].dc_pred + diff;
+      j->img_comp[b].dc_pred = dc;
+      data[0] = (short) (dc << j->succ_low);
+   } else {
+      // refinement scan for DC coefficient
+      if (stbi__jpeg_get_bit(j))
+         data[0] += (short) (1 << j->succ_low);
+   }
+   return 1;
+}
+
+// @OPTIMIZE: store non-zigzagged during the decode passes,
+// and only de-zigzag when dequantizing
+static int stbi__jpeg_decode_block_prog_ac(stbi__jpeg *j, short data[64], stbi__huffman *hac, stbi__int16 *fac)
+{
+   int k;
+   if (j->spec_start == 0) return stbi__err("can't merge dc and ac", "Corrupt JPEG");
+
+   if (j->succ_high == 0) {
+      int shift = j->succ_low;
+
+      if (j->eob_run) {
+         --j->eob_run;
+         return 1;
+      }
+
+      k = j->spec_start;
+      do {
+         unsigned int zig;
+         int c,r,s;
+         if (j->code_bits < 16) stbi__grow_buffer_unsafe(j);
+         c = (j->code_buffer >> (32 - FAST_BITS)) & ((1 << FAST_BITS)-1);
+         r = fac[c];
+         if (r) { // fast-AC path
+            k += (r >> 4) & 15; // run
+            s = r & 15; // combined length
+            j->code_buffer <<= s;
+            j->code_bits -= s;
+            zig = stbi__jpeg_dezigzag[k++];
+            data[zig] = (short) ((r >> 8) << shift);
+         } else {
+            int rs = stbi__jpeg_huff_decode(j, hac);
+            if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+            s = rs & 15;
+            r = rs >> 4;
+            if (s == 0) {
+               if (r < 15) {
+                  j->eob_run = (1 << r);
+                  if (r)
+                     j->eob_run += stbi__jpeg_get_bits(j, r);
+                  --j->eob_run;
+                  break;
+               }
+               k += 16;
+            } else {
+               k += r;
+               zig = stbi__jpeg_dezigzag[k++];
+               data[zig] = (short) (stbi__extend_receive(j,s) << shift);
+            }
+         }
+      } while (k <= j->spec_end);
+   } else {
+      // refinement scan for these AC coefficients
+
+      short bit = (short) (1 << j->succ_low);
+
+      if (j->eob_run) {
+         --j->eob_run;
+         for (k = j->spec_start; k <= j->spec_end; ++k) {
+            short *p = &data[stbi__jpeg_dezigzag[k]];
+            if (*p != 0)
+               if (stbi__jpeg_get_bit(j))
+                  if ((*p & bit)==0) {
+                     if (*p > 0)
+                        *p += bit;
+                     else
+                        *p -= bit;
+                  }
+         }
+      } else {
+         k = j->spec_start;
+         do {
+            int r,s;
+            int rs = stbi__jpeg_huff_decode(j, hac); // @OPTIMIZE see if we can use the fast path here, advance-by-r is so slow, eh
+            if (rs < 0) return stbi__err("bad huffman code","Corrupt JPEG");
+            s = rs & 15;
+            r = rs >> 4;
+            if (s == 0) {
+               if (r < 15) {
+                  j->eob_run = (1 << r) - 1;
+                  if (r)
+                     j->eob_run += stbi__jpeg_get_bits(j, r);
+                  r = 64; // force end of block
+               } else {
+                  // r=15 s=0 should write 16 0s, so we just do
+                  // a run of 15 0s and then write s (which is 0),
+                  // so we don't have to do anything special here
+               }
+            } else {
+               if (s != 1) return stbi__err("bad huffman code", "Corrupt JPEG");
+               // sign bit
+               if (stbi__jpeg_get_bit(j))
+                  s = bit;
+               else
+                  s = -bit;
+            }
+
+            // advance by r
+            while (k <= j->spec_end) {
+               short *p = &data[stbi__jpeg_dezigzag[k++]];
+               if (*p != 0) {
+                  if (stbi__jpeg_get_bit(j))
+                     if ((*p & bit)==0) {
+                        if (*p > 0)
+                           *p += bit;
+                        else
+                           *p -= bit;
+                     }
+               } else {
+                  if (r == 0) {
+                     *p = (short) s;
+                     break;
+                  }
+                  --r;
+               }
+            }
+         } while (k <= j->spec_end);
+      }
+   }
+   return 1;
+}
+
+// take a -128..127 value and stbi__clamp it and convert to 0..255
+stbi_inline static stbi_uc stbi__clamp(int x)
+{
+   // trick to use a single test to catch both cases
+   if ((unsigned int) x > 255) {
+      if (x < 0) return 0;
+      if (x > 255) return 255;
+   }
+   return (stbi_uc) x;
+}
+
+#define stbi__f2f(x)  ((int) (((x) * 4096 + 0.5)))
+#define stbi__fsh(x)  ((x) << 12)
+
+// derived from jidctint -- DCT_ISLOW
+#define STBI__IDCT_1D(s0,s1,s2,s3,s4,s5,s6,s7) \
+   int t0,t1,t2,t3,p1,p2,p3,p4,p5,x0,x1,x2,x3; \
+   p2 = s2;                                    \
+   p3 = s6;                                    \
+   p1 = (p2+p3) * stbi__f2f(0.5411961f);       \
+   t2 = p1 + p3*stbi__f2f(-1.847759065f);      \
+   t3 = p1 + p2*stbi__f2f( 0.765366865f);      \
+   p2 = s0;                                    \
+   p3 = s4;                                    \
+   t0 = stbi__fsh(p2+p3);                      \
+   t1 = stbi__fsh(p2-p3);                      \
+   x0 = t0+t3;                                 \
+   x3 = t0-t3;                                 \
+   x1 = t1+t2;                                 \
+   x2 = t1-t2;                                 \
+   t0 = s7;                                    \
+   t1 = s5;                                    \
+   t2 = s3;                                    \
+   t3 = s1;                                    \
+   p3 = t0+t2;                                 \
+   p4 = t1+t3;                                 \
+   p1 = t0+t3;                                 \
+   p2 = t1+t2;                                 \
+   p5 = (p3+p4)*stbi__f2f( 1.175875602f);      \
+   t0 = t0*stbi__f2f( 0.298631336f);           \
+   t1 = t1*stbi__f2f( 2.053119869f);           \
+   t2 = t2*stbi__f2f( 3.072711026f);           \
+   t3 = t3*stbi__f2f( 1.501321110f);           \
+   p1 = p5 + p1*stbi__f2f(-0.899976223f);      \
+   p2 = p5 + p2*stbi__f2f(-2.562915447f);      \
+   p3 = p3*stbi__f2f(-1.961570560f);           \
+   p4 = p4*stbi__f2f(-0.390180644f);           \
+   t3 += p1+p4;                                \
+   t2 += p2+p3;                                \
+   t1 += p2+p4;                                \
+   t0 += p1+p3;
+
+static void stbi__idct_block(stbi_uc *out, int out_stride, short data[64])
+{
+   int i,val[64],*v=val;
+   stbi_uc *o;
+   short *d = data;
+
+   // columns
+   for (i=0; i < 8; ++i,++d, ++v) {
+      // if all zeroes, shortcut -- this avoids dequantizing 0s and IDCTing
+      if (d[ 8]==0 && d[16]==0 && d[24]==0 && d[32]==0
+           && d[40]==0 && d[48]==0 && d[56]==0) {
+         //    no shortcut                 0     seconds
+         //    (1|2|3|4|5|6|7)==0          0     seconds
+         //    all separate               -0.047 seconds
+         //    1 && 2|3 && 4|5 && 6|7:    -0.047 seconds
+         int dcterm = d[0] << 2;
+         v[0] = v[8] = v[16] = v[24] = v[32] = v[40] = v[48] = v[56] = dcterm;
+      } else {
+         STBI__IDCT_1D(d[ 0],d[ 8],d[16],d[24],d[32],d[40],d[48],d[56])
+         // constants scaled things up by 1<<12; let's bring them back
+         // down, but keep 2 extra bits of precision
+         x0 += 512; x1 += 512; x2 += 512; x3 += 512;
+         v[ 0] = (x0+t3) >> 10;
+         v[56] = (x0-t3) >> 10;
+         v[ 8] = (x1+t2) >> 10;
+         v[48] = (x1-t2) >> 10;
+         v[16] = (x2+t1) >> 10;
+         v[40] = (x2-t1) >> 10;
+         v[24] = (x3+t0) >> 10;
+         v[32] = (x3-t0) >> 10;
+      }
+   }
+
+   for (i=0, v=val, o=out; i < 8; ++i,v+=8,o+=out_stride) {
+      // no fast case since the first 1D IDCT spread components out
+      STBI__IDCT_1D(v[0],v[1],v[2],v[3],v[4],v[5],v[6],v[7])
+      // constants scaled things up by 1<<12, plus we had 1<<2 from first
+      // loop, plus horizontal and vertical each scale by sqrt(8) so together
+      // we've got an extra 1<<3, so 1<<17 total we need to remove.
+      // so we want to round that, which means adding 0.5 * 1<<17,
+      // aka 65536. Also, we'll end up with -128 to 127 that we want
+      // to encode as 0..255 by adding 128, so we'll add that before the shift
+      x0 += 65536 + (128<<17);
+      x1 += 65536 + (128<<17);
+      x2 += 65536 + (128<<17);
+      x3 += 65536 + (128<<17);
+      // tried computing the shifts into temps, or'ing the temps to see
+      // if any were out of range, but that was slower
+      o[0] = stbi__clamp((x0+t3) >> 17);
+      o[7] = stbi__clamp((x0-t3) >> 17);
+      o[1] = stbi__clamp((x1+t2) >> 17);
+      o[6] = stbi__clamp((x1-t2) >> 17);
+      o[2] = stbi__clamp((x2+t1) >> 17);
+      o[5] = stbi__clamp((x2-t1) >> 17);
+      o[3] = stbi__clamp((x3+t0) >> 17);
+      o[4] = stbi__clamp((x3-t0) >> 17);
+   }
+}
+
+#ifdef STBI_SSE2
+// sse2 integer IDCT. not the fastest possible implementation but it
+// produces bit-identical results to the generic C version so it's
+// fully "transparent".
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
+{
+   // This is constructed to match our regular (generic) integer IDCT exactly.
+   __m128i row0, row1, row2, row3, row4, row5, row6, row7;
+   __m128i tmp;
+
+   // dot product constant: even elems=x, odd elems=y
+   #define dct_const(x,y)  _mm_setr_epi16((x),(y),(x),(y),(x),(y),(x),(y))
+
+   // out(0) = c0[even]*x + c0[odd]*y   (c0, x, y 16-bit, out 32-bit)
+   // out(1) = c1[even]*x + c1[odd]*y
+   #define dct_rot(out0,out1, x,y,c0,c1) \
+      __m128i c0##lo = _mm_unpacklo_epi16((x),(y)); \
+      __m128i c0##hi = _mm_unpackhi_epi16((x),(y)); \
+      __m128i out0##_l = _mm_madd_epi16(c0##lo, c0); \
+      __m128i out0##_h = _mm_madd_epi16(c0##hi, c0); \
+      __m128i out1##_l = _mm_madd_epi16(c0##lo, c1); \
+      __m128i out1##_h = _mm_madd_epi16(c0##hi, c1)
+
+   // out = in << 12  (in 16-bit, out 32-bit)
+   #define dct_widen(out, in) \
+      __m128i out##_l = _mm_srai_epi32(_mm_unpacklo_epi16(_mm_setzero_si128(), (in)), 4); \
+      __m128i out##_h = _mm_srai_epi32(_mm_unpackhi_epi16(_mm_setzero_si128(), (in)), 4)
+
+   // wide add
+   #define dct_wadd(out, a, b) \
+      __m128i out##_l = _mm_add_epi32(a##_l, b##_l); \
+      __m128i out##_h = _mm_add_epi32(a##_h, b##_h)
+
+   // wide sub
+   #define dct_wsub(out, a, b) \
+      __m128i out##_l = _mm_sub_epi32(a##_l, b##_l); \
+      __m128i out##_h = _mm_sub_epi32(a##_h, b##_h)
+
+   // butterfly a/b, add bias, then shift by "s" and pack
+   #define dct_bfly32o(out0, out1, a,b,bias,s) \
+      { \
+         __m128i abiased_l = _mm_add_epi32(a##_l, bias); \
+         __m128i abiased_h = _mm_add_epi32(a##_h, bias); \
+         dct_wadd(sum, abiased, b); \
+         dct_wsub(dif, abiased, b); \
+         out0 = _mm_packs_epi32(_mm_srai_epi32(sum_l, s), _mm_srai_epi32(sum_h, s)); \
+         out1 = _mm_packs_epi32(_mm_srai_epi32(dif_l, s), _mm_srai_epi32(dif_h, s)); \
+      }
+
+   // 8-bit interleave step (for transposes)
+   #define dct_interleave8(a, b) \
+      tmp = a; \
+      a = _mm_unpacklo_epi8(a, b); \
+      b = _mm_unpackhi_epi8(tmp, b)
+
+   // 16-bit interleave step (for transposes)
+   #define dct_interleave16(a, b) \
+      tmp = a; \
+      a = _mm_unpacklo_epi16(a, b); \
+      b = _mm_unpackhi_epi16(tmp, b)
+
+   #define dct_pass(bias,shift) \
+      { \
+         /* even part */ \
+         dct_rot(t2e,t3e, row2,row6, rot0_0,rot0_1); \
+         __m128i sum04 = _mm_add_epi16(row0, row4); \
+         __m128i dif04 = _mm_sub_epi16(row0, row4); \
+         dct_widen(t0e, sum04); \
+         dct_widen(t1e, dif04); \
+         dct_wadd(x0, t0e, t3e); \
+         dct_wsub(x3, t0e, t3e); \
+         dct_wadd(x1, t1e, t2e); \
+         dct_wsub(x2, t1e, t2e); \
+         /* odd part */ \
+         dct_rot(y0o,y2o, row7,row3, rot2_0,rot2_1); \
+         dct_rot(y1o,y3o, row5,row1, rot3_0,rot3_1); \
+         __m128i sum17 = _mm_add_epi16(row1, row7); \
+         __m128i sum35 = _mm_add_epi16(row3, row5); \
+         dct_rot(y4o,y5o, sum17,sum35, rot1_0,rot1_1); \
+         dct_wadd(x4, y0o, y4o); \
+         dct_wadd(x5, y1o, y5o); \
+         dct_wadd(x6, y2o, y5o); \
+         dct_wadd(x7, y3o, y4o); \
+         dct_bfly32o(row0,row7, x0,x7,bias,shift); \
+         dct_bfly32o(row1,row6, x1,x6,bias,shift); \
+         dct_bfly32o(row2,row5, x2,x5,bias,shift); \
+         dct_bfly32o(row3,row4, x3,x4,bias,shift); \
+      }
+
+   __m128i rot0_0 = dct_const(stbi__f2f(0.5411961f), stbi__f2f(0.5411961f) + stbi__f2f(-1.847759065f));
+   __m128i rot0_1 = dct_const(stbi__f2f(0.5411961f) + stbi__f2f( 0.765366865f), stbi__f2f(0.5411961f));
+   __m128i rot1_0 = dct_const(stbi__f2f(1.175875602f) + stbi__f2f(-0.899976223f), stbi__f2f(1.175875602f));
+   __m128i rot1_1 = dct_const(stbi__f2f(1.175875602f), stbi__f2f(1.175875602f) + stbi__f2f(-2.562915447f));
+   __m128i rot2_0 = dct_const(stbi__f2f(-1.961570560f) + stbi__f2f( 0.298631336f), stbi__f2f(-1.961570560f));
+   __m128i rot2_1 = dct_const(stbi__f2f(-1.961570560f), stbi__f2f(-1.961570560f) + stbi__f2f( 3.072711026f));
+   __m128i rot3_0 = dct_const(stbi__f2f(-0.390180644f) + stbi__f2f( 2.053119869f), stbi__f2f(-0.390180644f));
+   __m128i rot3_1 = dct_const(stbi__f2f(-0.390180644f), stbi__f2f(-0.390180644f) + stbi__f2f( 1.501321110f));
+
+   // rounding biases in column/row passes, see stbi__idct_block for explanation.
+   __m128i bias_0 = _mm_set1_epi32(512);
+   __m128i bias_1 = _mm_set1_epi32(65536 + (128<<17));
+
+   // load
+   row0 = _mm_load_si128((const __m128i *) (data + 0*8));
+   row1 = _mm_load_si128((const __m128i *) (data + 1*8));
+   row2 = _mm_load_si128((const __m128i *) (data + 2*8));
+   row3 = _mm_load_si128((const __m128i *) (data + 3*8));
+   row4 = _mm_load_si128((const __m128i *) (data + 4*8));
+   row5 = _mm_load_si128((const __m128i *) (data + 5*8));
+   row6 = _mm_load_si128((const __m128i *) (data + 6*8));
+   row7 = _mm_load_si128((const __m128i *) (data + 7*8));
+
+   // column pass
+   dct_pass(bias_0, 10);
+
+   {
+      // 16bit 8x8 transpose pass 1
+      dct_interleave16(row0, row4);
+      dct_interleave16(row1, row5);
+      dct_interleave16(row2, row6);
+      dct_interleave16(row3, row7);
+
+      // transpose pass 2
+      dct_interleave16(row0, row2);
+      dct_interleave16(row1, row3);
+      dct_interleave16(row4, row6);
+      dct_interleave16(row5, row7);
+
+      // transpose pass 3
+      dct_interleave16(row0, row1);
+      dct_interleave16(row2, row3);
+      dct_interleave16(row4, row5);
+      dct_interleave16(row6, row7);
+   }
+
+   // row pass
+   dct_pass(bias_1, 17);
+
+   {
+      // pack
+      __m128i p0 = _mm_packus_epi16(row0, row1); // a0a1a2a3...a7b0b1b2b3...b7
+      __m128i p1 = _mm_packus_epi16(row2, row3);
+      __m128i p2 = _mm_packus_epi16(row4, row5);
+      __m128i p3 = _mm_packus_epi16(row6, row7);
+
+      // 8bit 8x8 transpose pass 1
+      dct_interleave8(p0, p2); // a0e0a1e1...
+      dct_interleave8(p1, p3); // c0g0c1g1...
+
+      // transpose pass 2
+      dct_interleave8(p0, p1); // a0c0e0g0...
+      dct_interleave8(p2, p3); // b0d0f0h0...
+
+      // transpose pass 3
+      dct_interleave8(p0, p2); // a0b0c0d0...
+      dct_interleave8(p1, p3); // a4b4c4d4...
+
+      // store
+      _mm_storel_epi64((__m128i *) out, p0); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p0, 0x4e)); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, p2); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p2, 0x4e)); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, p1); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p1, 0x4e)); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, p3); out += out_stride;
+      _mm_storel_epi64((__m128i *) out, _mm_shuffle_epi32(p3, 0x4e));
+   }
+
+#undef dct_const
+#undef dct_rot
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_interleave8
+#undef dct_interleave16
+#undef dct_pass
+}
+
+#endif // STBI_SSE2
+
+#ifdef STBI_NEON
+
+// NEON integer IDCT. should produce bit-identical
+// results to the generic C version.
+static void stbi__idct_simd(stbi_uc *out, int out_stride, short data[64])
+{
+   int16x8_t row0, row1, row2, row3, row4, row5, row6, row7;
+
+   int16x4_t rot0_0 = vdup_n_s16(stbi__f2f(0.5411961f));
+   int16x4_t rot0_1 = vdup_n_s16(stbi__f2f(-1.847759065f));
+   int16x4_t rot0_2 = vdup_n_s16(stbi__f2f( 0.765366865f));
+   int16x4_t rot1_0 = vdup_n_s16(stbi__f2f( 1.175875602f));
+   int16x4_t rot1_1 = vdup_n_s16(stbi__f2f(-0.899976223f));
+   int16x4_t rot1_2 = vdup_n_s16(stbi__f2f(-2.562915447f));
+   int16x4_t rot2_0 = vdup_n_s16(stbi__f2f(-1.961570560f));
+   int16x4_t rot2_1 = vdup_n_s16(stbi__f2f(-0.390180644f));
+   int16x4_t rot3_0 = vdup_n_s16(stbi__f2f( 0.298631336f));
+   int16x4_t rot3_1 = vdup_n_s16(stbi__f2f( 2.053119869f));
+   int16x4_t rot3_2 = vdup_n_s16(stbi__f2f( 3.072711026f));
+   int16x4_t rot3_3 = vdup_n_s16(stbi__f2f( 1.501321110f));
+
+#define dct_long_mul(out, inq, coeff) \
+   int32x4_t out##_l = vmull_s16(vget_low_s16(inq), coeff); \
+   int32x4_t out##_h = vmull_s16(vget_high_s16(inq), coeff)
+
+#define dct_long_mac(out, acc, inq, coeff) \
+   int32x4_t out##_l = vmlal_s16(acc##_l, vget_low_s16(inq), coeff); \
+   int32x4_t out##_h = vmlal_s16(acc##_h, vget_high_s16(inq), coeff)
+
+#define dct_widen(out, inq) \
+   int32x4_t out##_l = vshll_n_s16(vget_low_s16(inq), 12); \
+   int32x4_t out##_h = vshll_n_s16(vget_high_s16(inq), 12)
+
+// wide add
+#define dct_wadd(out, a, b) \
+   int32x4_t out##_l = vaddq_s32(a##_l, b##_l); \
+   int32x4_t out##_h = vaddq_s32(a##_h, b##_h)
+
+// wide sub
+#define dct_wsub(out, a, b) \
+   int32x4_t out##_l = vsubq_s32(a##_l, b##_l); \
+   int32x4_t out##_h = vsubq_s32(a##_h, b##_h)
+
+// butterfly a/b, then shift using "shiftop" by "s" and pack
+#define dct_bfly32o(out0,out1, a,b,shiftop,s) \
+   { \
+      dct_wadd(sum, a, b); \
+      dct_wsub(dif, a, b); \
+      out0 = vcombine_s16(shiftop(sum_l, s), shiftop(sum_h, s)); \
+      out1 = vcombine_s16(shiftop(dif_l, s), shiftop(dif_h, s)); \
+   }
+
+#define dct_pass(shiftop, shift) \
+   { \
+      /* even part */ \
+      int16x8_t sum26 = vaddq_s16(row2, row6); \
+      dct_long_mul(p1e, sum26, rot0_0); \
+      dct_long_mac(t2e, p1e, row6, rot0_1); \
+      dct_long_mac(t3e, p1e, row2, rot0_2); \
+      int16x8_t sum04 = vaddq_s16(row0, row4); \
+      int16x8_t dif04 = vsubq_s16(row0, row4); \
+      dct_widen(t0e, sum04); \
+      dct_widen(t1e, dif04); \
+      dct_wadd(x0, t0e, t3e); \
+      dct_wsub(x3, t0e, t3e); \
+      dct_wadd(x1, t1e, t2e); \
+      dct_wsub(x2, t1e, t2e); \
+      /* odd part */ \
+      int16x8_t sum15 = vaddq_s16(row1, row5); \
+      int16x8_t sum17 = vaddq_s16(row1, row7); \
+      int16x8_t sum35 = vaddq_s16(row3, row5); \
+      int16x8_t sum37 = vaddq_s16(row3, row7); \
+      int16x8_t sumodd = vaddq_s16(sum17, sum35); \
+      dct_long_mul(p5o, sumodd, rot1_0); \
+      dct_long_mac(p1o, p5o, sum17, rot1_1); \
+      dct_long_mac(p2o, p5o, sum35, rot1_2); \
+      dct_long_mul(p3o, sum37, rot2_0); \
+      dct_long_mul(p4o, sum15, rot2_1); \
+      dct_wadd(sump13o, p1o, p3o); \
+      dct_wadd(sump24o, p2o, p4o); \
+      dct_wadd(sump23o, p2o, p3o); \
+      dct_wadd(sump14o, p1o, p4o); \
+      dct_long_mac(x4, sump13o, row7, rot3_0); \
+      dct_long_mac(x5, sump24o, row5, rot3_1); \
+      dct_long_mac(x6, sump23o, row3, rot3_2); \
+      dct_long_mac(x7, sump14o, row1, rot3_3); \
+      dct_bfly32o(row0,row7, x0,x7,shiftop,shift); \
+      dct_bfly32o(row1,row6, x1,x6,shiftop,shift); \
+      dct_bfly32o(row2,row5, x2,x5,shiftop,shift); \
+      dct_bfly32o(row3,row4, x3,x4,shiftop,shift); \
+   }
+
+   // load
+   row0 = vld1q_s16(data + 0*8);
+   row1 = vld1q_s16(data + 1*8);
+   row2 = vld1q_s16(data + 2*8);
+   row3 = vld1q_s16(data + 3*8);
+   row4 = vld1q_s16(data + 4*8);
+   row5 = vld1q_s16(data + 5*8);
+   row6 = vld1q_s16(data + 6*8);
+   row7 = vld1q_s16(data + 7*8);
+
+   // add DC bias
+   row0 = vaddq_s16(row0, vsetq_lane_s16(1024, vdupq_n_s16(0), 0));
+
+   // column pass
+   dct_pass(vrshrn_n_s32, 10);
+
+   // 16bit 8x8 transpose
+   {
+// these three map to a single VTRN.16, VTRN.32, and VSWP, respectively.
+// whether compilers actually get this is another story, sadly.
+#define dct_trn16(x, y) { int16x8x2_t t = vtrnq_s16(x, y); x = t.val[0]; y = t.val[1]; }
+#define dct_trn32(x, y) { int32x4x2_t t = vtrnq_s32(vreinterpretq_s32_s16(x), vreinterpretq_s32_s16(y)); x = vreinterpretq_s16_s32(t.val[0]); y = vreinterpretq_s16_s32(t.val[1]); }
+#define dct_trn64(x, y) { int16x8_t x0 = x; int16x8_t y0 = y; x = vcombine_s16(vget_low_s16(x0), vget_low_s16(y0)); y = vcombine_s16(vget_high_s16(x0), vget_high_s16(y0)); }
+
+      // pass 1
+      dct_trn16(row0, row1); // a0b0a2b2a4b4a6b6
+      dct_trn16(row2, row3);
+      dct_trn16(row4, row5);
+      dct_trn16(row6, row7);
+
+      // pass 2
+      dct_trn32(row0, row2); // a0b0c0d0a4b4c4d4
+      dct_trn32(row1, row3);
+      dct_trn32(row4, row6);
+      dct_trn32(row5, row7);
+
+      // pass 3
+      dct_trn64(row0, row4); // a0b0c0d0e0f0g0h0
+      dct_trn64(row1, row5);
+      dct_trn64(row2, row6);
+      dct_trn64(row3, row7);
+
+#undef dct_trn16
+#undef dct_trn32
+#undef dct_trn64
+   }
+
+   // row pass
+   // vrshrn_n_s32 only supports shifts up to 16, we need
+   // 17. so do a non-rounding shift of 16 first then follow
+   // up with a rounding shift by 1.
+   dct_pass(vshrn_n_s32, 16);
+
+   {
+      // pack and round
+      uint8x8_t p0 = vqrshrun_n_s16(row0, 1);
+      uint8x8_t p1 = vqrshrun_n_s16(row1, 1);
+      uint8x8_t p2 = vqrshrun_n_s16(row2, 1);
+      uint8x8_t p3 = vqrshrun_n_s16(row3, 1);
+      uint8x8_t p4 = vqrshrun_n_s16(row4, 1);
+      uint8x8_t p5 = vqrshrun_n_s16(row5, 1);
+      uint8x8_t p6 = vqrshrun_n_s16(row6, 1);
+      uint8x8_t p7 = vqrshrun_n_s16(row7, 1);
+
+      // again, these can translate into one instruction, but often don't.
+#define dct_trn8_8(x, y) { uint8x8x2_t t = vtrn_u8(x, y); x = t.val[0]; y = t.val[1]; }
+#define dct_trn8_16(x, y) { uint16x4x2_t t = vtrn_u16(vreinterpret_u16_u8(x), vreinterpret_u16_u8(y)); x = vreinterpret_u8_u16(t.val[0]); y = vreinterpret_u8_u16(t.val[1]); }
+#define dct_trn8_32(x, y) { uint32x2x2_t t = vtrn_u32(vreinterpret_u32_u8(x), vreinterpret_u32_u8(y)); x = vreinterpret_u8_u32(t.val[0]); y = vreinterpret_u8_u32(t.val[1]); }
+
+      // sadly can't use interleaved stores here since we only write
+      // 8 bytes to each scan line!
+
+      // 8x8 8-bit transpose pass 1
+      dct_trn8_8(p0, p1);
+      dct_trn8_8(p2, p3);
+      dct_trn8_8(p4, p5);
+      dct_trn8_8(p6, p7);
+
+      // pass 2
+      dct_trn8_16(p0, p2);
+      dct_trn8_16(p1, p3);
+      dct_trn8_16(p4, p6);
+      dct_trn8_16(p5, p7);
+
+      // pass 3
+      dct_trn8_32(p0, p4);
+      dct_trn8_32(p1, p5);
+      dct_trn8_32(p2, p6);
+      dct_trn8_32(p3, p7);
+
+      // store
+      vst1_u8(out, p0); out += out_stride;
+      vst1_u8(out, p1); out += out_stride;
+      vst1_u8(out, p2); out += out_stride;
+      vst1_u8(out, p3); out += out_stride;
+      vst1_u8(out, p4); out += out_stride;
+      vst1_u8(out, p5); out += out_stride;
+      vst1_u8(out, p6); out += out_stride;
+      vst1_u8(out, p7);
+
+#undef dct_trn8_8
+#undef dct_trn8_16
+#undef dct_trn8_32
+   }
+
+#undef dct_long_mul
+#undef dct_long_mac
+#undef dct_widen
+#undef dct_wadd
+#undef dct_wsub
+#undef dct_bfly32o
+#undef dct_pass
+}
+
+#endif // STBI_NEON
+
+#define STBI__MARKER_none  0xff
+// if there's a pending marker from the entropy stream, return that
+// otherwise, fetch from the stream and get a marker. if there's no
+// marker, return 0xff, which is never a valid marker value
+static stbi_uc stbi__get_marker(stbi__jpeg *j)
+{
+   stbi_uc x;
+   if (j->marker != STBI__MARKER_none) { x = j->marker; j->marker = STBI__MARKER_none; return x; }
+   x = stbi__get8(j->s);
+   if (x != 0xff) return STBI__MARKER_none;
+   while (x == 0xff)
+      x = stbi__get8(j->s);
+   return x;
+}
+
+// in each scan, we'll have scan_n components, and the order
+// of the components is specified by order[]
+#define STBI__RESTART(x)     ((x) >= 0xd0 && (x) <= 0xd7)
+
+// after a restart interval, stbi__jpeg_reset the entropy decoder and
+// the dc prediction
+static void stbi__jpeg_reset(stbi__jpeg *j)
+{
+   j->code_bits = 0;
+   j->code_buffer = 0;
+   j->nomore = 0;
+   j->img_comp[0].dc_pred = j->img_comp[1].dc_pred = j->img_comp[2].dc_pred = 0;
+   j->marker = STBI__MARKER_none;
+   j->todo = j->restart_interval ? j->restart_interval : 0x7fffffff;
+   j->eob_run = 0;
+   // no more than 1<<31 MCUs if no restart_interal? that's plenty safe,
+   // since we don't even allow 1<<30 pixels
+}
+
+static int stbi__parse_entropy_coded_data(stbi__jpeg *z)
+{
+   stbi__jpeg_reset(z);
+   if (!z->progressive) {
+      if (z->scan_n == 1) {
+         int i,j;
+         STBI_SIMD_ALIGN(short, data[64]);
+         int n = z->order[0];
+         // non-interleaved data, we just need to process one block at a time,
+         // in trivial scanline order
+         // number of blocks to do just depends on how many actual "pixels" this
+         // component has, independent of interleaved MCU blocking and such
+         int w = (z->img_comp[n].x+7) >> 3;
+         int h = (z->img_comp[n].y+7) >> 3;
+         for (j=0; j < h; ++j) {
+            for (i=0; i < w; ++i) {
+               int ha = z->img_comp[n].ha;
+               if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
+               z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
+               // every data block is an MCU, so countdown the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  // if it's NOT a restart, then just bail, so we get corrupt data
+                  // rather than no data
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      } else { // interleaved
+         int i,j,k,x,y;
+         STBI_SIMD_ALIGN(short, data[64]);
+         for (j=0; j < z->img_mcu_y; ++j) {
+            for (i=0; i < z->img_mcu_x; ++i) {
+               // scan an interleaved mcu... process scan_n components in order
+               for (k=0; k < z->scan_n; ++k) {
+                  int n = z->order[k];
+                  // scan out an mcu's worth of this component; that's just determined
+                  // by the basic H and V specified for the component
+                  for (y=0; y < z->img_comp[n].v; ++y) {
+                     for (x=0; x < z->img_comp[n].h; ++x) {
+                        int x2 = (i*z->img_comp[n].h + x)*8;
+                        int y2 = (j*z->img_comp[n].v + y)*8;
+                        int ha = z->img_comp[n].ha;
+                        if (!stbi__jpeg_decode_block(z, data, z->huff_dc+z->img_comp[n].hd, z->huff_ac+ha, z->fast_ac[ha], n, z->dequant[z->img_comp[n].tq])) return 0;
+                        z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*y2+x2, z->img_comp[n].w2, data);
+                     }
+                  }
+               }
+               // after all interleaved components, that's an interleaved MCU,
+               // so now count down the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      }
+   } else {
+      if (z->scan_n == 1) {
+         int i,j;
+         int n = z->order[0];
+         // non-interleaved data, we just need to process one block at a time,
+         // in trivial scanline order
+         // number of blocks to do just depends on how many actual "pixels" this
+         // component has, independent of interleaved MCU blocking and such
+         int w = (z->img_comp[n].x+7) >> 3;
+         int h = (z->img_comp[n].y+7) >> 3;
+         for (j=0; j < h; ++j) {
+            for (i=0; i < w; ++i) {
+               short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+               if (z->spec_start == 0) {
+                  if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+                     return 0;
+               } else {
+                  int ha = z->img_comp[n].ha;
+                  if (!stbi__jpeg_decode_block_prog_ac(z, data, &z->huff_ac[ha], z->fast_ac[ha]))
+                     return 0;
+               }
+               // every data block is an MCU, so countdown the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      } else { // interleaved
+         int i,j,k,x,y;
+         for (j=0; j < z->img_mcu_y; ++j) {
+            for (i=0; i < z->img_mcu_x; ++i) {
+               // scan an interleaved mcu... process scan_n components in order
+               for (k=0; k < z->scan_n; ++k) {
+                  int n = z->order[k];
+                  // scan out an mcu's worth of this component; that's just determined
+                  // by the basic H and V specified for the component
+                  for (y=0; y < z->img_comp[n].v; ++y) {
+                     for (x=0; x < z->img_comp[n].h; ++x) {
+                        int x2 = (i*z->img_comp[n].h + x);
+                        int y2 = (j*z->img_comp[n].v + y);
+                        short *data = z->img_comp[n].coeff + 64 * (x2 + y2 * z->img_comp[n].coeff_w);
+                        if (!stbi__jpeg_decode_block_prog_dc(z, data, &z->huff_dc[z->img_comp[n].hd], n))
+                           return 0;
+                     }
+                  }
+               }
+               // after all interleaved components, that's an interleaved MCU,
+               // so now count down the restart interval
+               if (--z->todo <= 0) {
+                  if (z->code_bits < 24) stbi__grow_buffer_unsafe(z);
+                  if (!STBI__RESTART(z->marker)) return 1;
+                  stbi__jpeg_reset(z);
+               }
+            }
+         }
+         return 1;
+      }
+   }
+}
+
+static void stbi__jpeg_dequantize(short *data, stbi_uc *dequant)
+{
+   int i;
+   for (i=0; i < 64; ++i)
+      data[i] *= dequant[i];
+}
+
+static void stbi__jpeg_finish(stbi__jpeg *z)
+{
+   if (z->progressive) {
+      // dequantize and idct the data
+      int i,j,n;
+      for (n=0; n < z->s->img_n; ++n) {
+         int w = (z->img_comp[n].x+7) >> 3;
+         int h = (z->img_comp[n].y+7) >> 3;
+         for (j=0; j < h; ++j) {
+            for (i=0; i < w; ++i) {
+               short *data = z->img_comp[n].coeff + 64 * (i + j * z->img_comp[n].coeff_w);
+               stbi__jpeg_dequantize(data, z->dequant[z->img_comp[n].tq]);
+               z->idct_block_kernel(z->img_comp[n].data+z->img_comp[n].w2*j*8+i*8, z->img_comp[n].w2, data);
+            }
+         }
+      }
+   }
+}
+
+static int stbi__process_marker(stbi__jpeg *z, int m)
+{
+   int L;
+   switch (m) {
+      case STBI__MARKER_none: // no marker found
+         return stbi__err("expected marker","Corrupt JPEG");
+
+      case 0xDD: // DRI - specify restart interval
+         if (stbi__get16be(z->s) != 4) return stbi__err("bad DRI len","Corrupt JPEG");
+         z->restart_interval = stbi__get16be(z->s);
+         return 1;
+
+      case 0xDB: // DQT - define quantization table
+         L = stbi__get16be(z->s)-2;
+         while (L > 0) {
+            int q = stbi__get8(z->s);
+            int p = q >> 4;
+            int t = q & 15,i;
+            if (p != 0) return stbi__err("bad DQT type","Corrupt JPEG");
+            if (t > 3) return stbi__err("bad DQT table","Corrupt JPEG");
+            for (i=0; i < 64; ++i)
+               z->dequant[t][stbi__jpeg_dezigzag[i]] = stbi__get8(z->s);
+            L -= 65;
+         }
+         return L==0;
+
+      case 0xC4: // DHT - define huffman table
+         L = stbi__get16be(z->s)-2;
+         while (L > 0) {
+            stbi_uc *v;
+            int sizes[16],i,n=0;
+            int q = stbi__get8(z->s);
+            int tc = q >> 4;
+            int th = q & 15;
+            if (tc > 1 || th > 3) return stbi__err("bad DHT header","Corrupt JPEG");
+            for (i=0; i < 16; ++i) {
+               sizes[i] = stbi__get8(z->s);
+               n += sizes[i];
+            }
+            L -= 17;
+            if (tc == 0) {
+               if (!stbi__build_huffman(z->huff_dc+th, sizes)) return 0;
+               v = z->huff_dc[th].values;
+            } else {
+               if (!stbi__build_huffman(z->huff_ac+th, sizes)) return 0;
+               v = z->huff_ac[th].values;
+            }
+            for (i=0; i < n; ++i)
+               v[i] = stbi__get8(z->s);
+            if (tc != 0)
+               stbi__build_fast_ac(z->fast_ac[th], z->huff_ac + th);
+            L -= n;
+         }
+         return L==0;
+   }
+   // check for comment block or APP blocks
+   if ((m >= 0xE0 && m <= 0xEF) || m == 0xFE) {
+      stbi__skip(z->s, stbi__get16be(z->s)-2);
+      return 1;
+   }
+   return 0;
+}
+
+// after we see SOS
+static int stbi__process_scan_header(stbi__jpeg *z)
+{
+   int i;
+   int Ls = stbi__get16be(z->s);
+   z->scan_n = stbi__get8(z->s);
+   if (z->scan_n < 1 || z->scan_n > 4 || z->scan_n > (int) z->s->img_n) return stbi__err("bad SOS component count","Corrupt JPEG");
+   if (Ls != 6+2*z->scan_n) return stbi__err("bad SOS len","Corrupt JPEG");
+   for (i=0; i < z->scan_n; ++i) {
+      int id = stbi__get8(z->s), which;
+      int q = stbi__get8(z->s);
+      for (which = 0; which < z->s->img_n; ++which)
+         if (z->img_comp[which].id == id)
+            break;
+      if (which == z->s->img_n) return 0; // no match
+      z->img_comp[which].hd = q >> 4;   if (z->img_comp[which].hd > 3) return stbi__err("bad DC huff","Corrupt JPEG");
+      z->img_comp[which].ha = q & 15;   if (z->img_comp[which].ha > 3) return stbi__err("bad AC huff","Corrupt JPEG");
+      z->order[i] = which;
+   }
+
+   {
+      int aa;
+      z->spec_start = stbi__get8(z->s);
+      z->spec_end   = stbi__get8(z->s); // should be 63, but might be 0
+      aa = stbi__get8(z->s);
+      z->succ_high = (aa >> 4);
+      z->succ_low  = (aa & 15);
+      if (z->progressive) {
+         if (z->spec_start > 63 || z->spec_end > 63  || z->spec_start > z->spec_end || z->succ_high > 13 || z->succ_low > 13)
+            return stbi__err("bad SOS", "Corrupt JPEG");
+      } else {
+         if (z->spec_start != 0) return stbi__err("bad SOS","Corrupt JPEG");
+         if (z->succ_high != 0 || z->succ_low != 0) return stbi__err("bad SOS","Corrupt JPEG");
+         z->spec_end = 63;
+      }
+   }
+
+   return 1;
+}
+
+static int stbi__process_frame_header(stbi__jpeg *z, int scan)
+{
+   stbi__context *s = z->s;
+   int Lf,p,i,q, h_max=1,v_max=1,c;
+   Lf = stbi__get16be(s);         if (Lf < 11) return stbi__err("bad SOF len","Corrupt JPEG"); // JPEG
+   p  = stbi__get8(s);            if (p != 8) return stbi__err("only 8-bit","JPEG format not supported: 8-bit only"); // JPEG baseline
+   s->img_y = stbi__get16be(s);   if (s->img_y == 0) return stbi__err("no header height", "JPEG format not supported: delayed height"); // Legal, but we don't handle it--but neither does IJG
+   s->img_x = stbi__get16be(s);   if (s->img_x == 0) return stbi__err("0 width","Corrupt JPEG"); // JPEG requires
+   c = stbi__get8(s);
+   if (c != 3 && c != 1) return stbi__err("bad component count","Corrupt JPEG");    // JFIF requires
+   s->img_n = c;
+   for (i=0; i < c; ++i) {
+      z->img_comp[i].data = NULL;
+      z->img_comp[i].linebuf = NULL;
+   }
+
+   if (Lf != 8+3*s->img_n) return stbi__err("bad SOF len","Corrupt JPEG");
+
+   for (i=0; i < s->img_n; ++i) {
+      z->img_comp[i].id = stbi__get8(s);
+      if (z->img_comp[i].id != i+1)   // JFIF requires
+         if (z->img_comp[i].id != i)  // some version of jpegtran outputs non-JFIF-compliant files!
+            return stbi__err("bad component ID","Corrupt JPEG");
+      q = stbi__get8(s);
+      z->img_comp[i].h = (q >> 4);  if (!z->img_comp[i].h || z->img_comp[i].h > 4) return stbi__err("bad H","Corrupt JPEG");
+      z->img_comp[i].v = q & 15;    if (!z->img_comp[i].v || z->img_comp[i].v > 4) return stbi__err("bad V","Corrupt JPEG");
+      z->img_comp[i].tq = stbi__get8(s);  if (z->img_comp[i].tq > 3) return stbi__err("bad TQ","Corrupt JPEG");
+   }
+
+   if (scan != STBI__SCAN_load) return 1;
+
+   if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");
+
+   for (i=0; i < s->img_n; ++i) {
+      if (z->img_comp[i].h > h_max) h_max = z->img_comp[i].h;
+      if (z->img_comp[i].v > v_max) v_max = z->img_comp[i].v;
+   }
+
+   // compute interleaved mcu info
+   z->img_h_max = h_max;
+   z->img_v_max = v_max;
+   z->img_mcu_w = h_max * 8;
+   z->img_mcu_h = v_max * 8;
+   z->img_mcu_x = (s->img_x + z->img_mcu_w-1) / z->img_mcu_w;
+   z->img_mcu_y = (s->img_y + z->img_mcu_h-1) / z->img_mcu_h;
+
+   for (i=0; i < s->img_n; ++i) {
+      // number of effective pixels (e.g. for non-interleaved MCU)
+      z->img_comp[i].x = (s->img_x * z->img_comp[i].h + h_max-1) / h_max;
+      z->img_comp[i].y = (s->img_y * z->img_comp[i].v + v_max-1) / v_max;
+      // to simplify generation, we'll allocate enough memory to decode
+      // the bogus oversized data from using interleaved MCUs and their
+      // big blocks (e.g. a 16x16 iMCU on an image of width 33); we won't
+      // discard the extra data until colorspace conversion
+      z->img_comp[i].w2 = z->img_mcu_x * z->img_comp[i].h * 8;
+      z->img_comp[i].h2 = z->img_mcu_y * z->img_comp[i].v * 8;
+      z->img_comp[i].raw_data = stbi__malloc(z->img_comp[i].w2 * z->img_comp[i].h2+15);
+
+      if (z->img_comp[i].raw_data == NULL) {
+         for(--i; i >= 0; --i) {
+            STBI_FREE(z->img_comp[i].raw_data);
+            z->img_comp[i].raw_data = NULL;
+         }
+         return stbi__err("outofmem", "Out of memory");
+      }
+      // align blocks for idct using mmx/sse
+      z->img_comp[i].data = (stbi_uc*) (((size_t) z->img_comp[i].raw_data + 15) & ~15);
+      z->img_comp[i].linebuf = NULL;
+      if (z->progressive) {
+         z->img_comp[i].coeff_w = (z->img_comp[i].w2 + 7) >> 3;
+         z->img_comp[i].coeff_h = (z->img_comp[i].h2 + 7) >> 3;
+         z->img_comp[i].raw_coeff = STBI_MALLOC(z->img_comp[i].coeff_w * z->img_comp[i].coeff_h * 64 * sizeof(short) + 15);
+         z->img_comp[i].coeff = (short*) (((size_t) z->img_comp[i].raw_coeff + 15) & ~15);
+      } else {
+         z->img_comp[i].coeff = 0;
+         z->img_comp[i].raw_coeff = 0;
+      }
+   }
+
+   return 1;
+}
+
+// use comparisons since in some cases we handle more than one case (e.g. SOF)
+#define stbi__DNL(x)         ((x) == 0xdc)
+#define stbi__SOI(x)         ((x) == 0xd8)
+#define stbi__EOI(x)         ((x) == 0xd9)
+#define stbi__SOF(x)         ((x) == 0xc0 || (x) == 0xc1 || (x) == 0xc2)
+#define stbi__SOS(x)         ((x) == 0xda)
+
+#define stbi__SOF_progressive(x)   ((x) == 0xc2)
+
+static int stbi__decode_jpeg_header(stbi__jpeg *z, int scan)
+{
+   int m;
+   z->marker = STBI__MARKER_none; // initialize cached marker to empty
+   m = stbi__get_marker(z);
+   if (!stbi__SOI(m)) return stbi__err("no SOI","Corrupt JPEG");
+   if (scan == STBI__SCAN_type) return 1;
+   m = stbi__get_marker(z);
+   while (!stbi__SOF(m)) {
+      if (!stbi__process_marker(z,m)) return 0;
+      m = stbi__get_marker(z);
+      while (m == STBI__MARKER_none) {
+         // some files have extra padding after their blocks, so ok, we'll scan
+         if (stbi__at_eof(z->s)) return stbi__err("no SOF", "Corrupt JPEG");
+         m = stbi__get_marker(z);
+      }
+   }
+   z->progressive = stbi__SOF_progressive(m);
+   if (!stbi__process_frame_header(z, scan)) return 0;
+   return 1;
+}
+
+// decode image to YCbCr format
+static int stbi__decode_jpeg_image(stbi__jpeg *j)
+{
+   int m;
+   for (m = 0; m < 4; m++) {
+      j->img_comp[m].raw_data = NULL;
+      j->img_comp[m].raw_coeff = NULL;
+   }
+   j->restart_interval = 0;
+   if (!stbi__decode_jpeg_header(j, STBI__SCAN_load)) return 0;
+   m = stbi__get_marker(j);
+   while (!stbi__EOI(m)) {
+      if (stbi__SOS(m)) {
+         if (!stbi__process_scan_header(j)) return 0;
+         if (!stbi__parse_entropy_coded_data(j)) return 0;
+         if (j->marker == STBI__MARKER_none ) {
+            // handle 0s at the end of image data from IP Kamera 9060
+            while (!stbi__at_eof(j->s)) {
+               int x = stbi__get8(j->s);
+               if (x == 255) {
+                  j->marker = stbi__get8(j->s);
+                  break;
+               } else if (x != 0) {
+                  return stbi__err("junk before marker", "Corrupt JPEG");
+               }
+            }
+            // if we reach eof without hitting a marker, stbi__get_marker() below will fail and we'll eventually return 0
+         }
+      } else {
+         if (!stbi__process_marker(j, m)) return 0;
+      }
+      m = stbi__get_marker(j);
+   }
+   if (j->progressive)
+      stbi__jpeg_finish(j);
+   return 1;
+}
+
+// static jfif-centered resampling (across block boundaries)
+
+typedef stbi_uc *(*resample_row_func)(stbi_uc *out, stbi_uc *in0, stbi_uc *in1,
+                                    int w, int hs);
+
+#define stbi__div4(x) ((stbi_uc) ((x) >> 2))
+
+static stbi_uc *resample_row_1(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   STBI_NOTUSED(out);
+   STBI_NOTUSED(in_far);
+   STBI_NOTUSED(w);
+   STBI_NOTUSED(hs);
+   return in_near;
+}
+
+static stbi_uc* stbi__resample_row_v_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate two samples vertically for every one in input
+   int i;
+   STBI_NOTUSED(hs);
+   for (i=0; i < w; ++i)
+      out[i] = stbi__div4(3*in_near[i] + in_far[i] + 2);
+   return out;
+}
+
+static stbi_uc*  stbi__resample_row_h_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate two samples horizontally for every one in input
+   int i;
+   stbi_uc *input = in_near;
+
+   if (w == 1) {
+      // if only one sample, can't do any interpolation
+      out[0] = out[1] = input[0];
+      return out;
+   }
+
+   out[0] = input[0];
+   out[1] = stbi__div4(input[0]*3 + input[1] + 2);
+   for (i=1; i < w-1; ++i) {
+      int n = 3*input[i]+2;
+      out[i*2+0] = stbi__div4(n+input[i-1]);
+      out[i*2+1] = stbi__div4(n+input[i+1]);
+   }
+   out[i*2+0] = stbi__div4(input[w-2]*3 + input[w-1] + 2);
+   out[i*2+1] = input[w-1];
+
+   STBI_NOTUSED(in_far);
+   STBI_NOTUSED(hs);
+
+   return out;
+}
+
+#define stbi__div16(x) ((stbi_uc) ((x) >> 4))
+
+static stbi_uc *stbi__resample_row_hv_2(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate 2x2 samples for every one in input
+   int i,t0,t1;
+   if (w == 1) {
+      out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
+      return out;
+   }
+
+   t1 = 3*in_near[0] + in_far[0];
+   out[0] = stbi__div4(t1+2);
+   for (i=1; i < w; ++i) {
+      t0 = t1;
+      t1 = 3*in_near[i]+in_far[i];
+      out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
+      out[i*2  ] = stbi__div16(3*t1 + t0 + 8);
+   }
+   out[w*2-1] = stbi__div4(t1+2);
+
+   STBI_NOTUSED(hs);
+
+   return out;
+}
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static stbi_uc *stbi__resample_row_hv_2_simd(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // need to generate 2x2 samples for every one in input
+   int i=0,t0,t1;
+
+   if (w == 1) {
+      out[0] = out[1] = stbi__div4(3*in_near[0] + in_far[0] + 2);
+      return out;
+   }
+
+   t1 = 3*in_near[0] + in_far[0];
+   // process groups of 8 pixels for as long as we can.
+   // note we can't handle the last pixel in a row in this loop
+   // because we need to handle the filter boundary conditions.
+   for (; i < ((w-1) & ~7); i += 8) {
+#if defined(STBI_SSE2)
+      // load and perform the vertical filtering pass
+      // this uses 3*x + y = 4*x + (y - x)
+      __m128i zero  = _mm_setzero_si128();
+      __m128i farb  = _mm_loadl_epi64((__m128i *) (in_far + i));
+      __m128i nearb = _mm_loadl_epi64((__m128i *) (in_near + i));
+      __m128i farw  = _mm_unpacklo_epi8(farb, zero);
+      __m128i nearw = _mm_unpacklo_epi8(nearb, zero);
+      __m128i diff  = _mm_sub_epi16(farw, nearw);
+      __m128i nears = _mm_slli_epi16(nearw, 2);
+      __m128i curr  = _mm_add_epi16(nears, diff); // current row
+
+      // horizontal filter works the same based on shifted vers of current
+      // row. "prev" is current row shifted right by 1 pixel; we need to
+      // insert the previous pixel value (from t1).
+      // "next" is current row shifted left by 1 pixel, with first pixel
+      // of next block of 8 pixels added in.
+      __m128i prv0 = _mm_slli_si128(curr, 2);
+      __m128i nxt0 = _mm_srli_si128(curr, 2);
+      __m128i prev = _mm_insert_epi16(prv0, t1, 0);
+      __m128i next = _mm_insert_epi16(nxt0, 3*in_near[i+8] + in_far[i+8], 7);
+
+      // horizontal filter, polyphase implementation since it's convenient:
+      // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+      // odd  pixels = 3*cur + next = cur*4 + (next - cur)
+      // note the shared term.
+      __m128i bias  = _mm_set1_epi16(8);
+      __m128i curs = _mm_slli_epi16(curr, 2);
+      __m128i prvd = _mm_sub_epi16(prev, curr);
+      __m128i nxtd = _mm_sub_epi16(next, curr);
+      __m128i curb = _mm_add_epi16(curs, bias);
+      __m128i even = _mm_add_epi16(prvd, curb);
+      __m128i odd  = _mm_add_epi16(nxtd, curb);
+
+      // interleave even and odd pixels, then undo scaling.
+      __m128i int0 = _mm_unpacklo_epi16(even, odd);
+      __m128i int1 = _mm_unpackhi_epi16(even, odd);
+      __m128i de0  = _mm_srli_epi16(int0, 4);
+      __m128i de1  = _mm_srli_epi16(int1, 4);
+
+      // pack and write output
+      __m128i outv = _mm_packus_epi16(de0, de1);
+      _mm_storeu_si128((__m128i *) (out + i*2), outv);
+#elif defined(STBI_NEON)
+      // load and perform the vertical filtering pass
+      // this uses 3*x + y = 4*x + (y - x)
+      uint8x8_t farb  = vld1_u8(in_far + i);
+      uint8x8_t nearb = vld1_u8(in_near + i);
+      int16x8_t diff  = vreinterpretq_s16_u16(vsubl_u8(farb, nearb));
+      int16x8_t nears = vreinterpretq_s16_u16(vshll_n_u8(nearb, 2));
+      int16x8_t curr  = vaddq_s16(nears, diff); // current row
+
+      // horizontal filter works the same based on shifted vers of current
+      // row. "prev" is current row shifted right by 1 pixel; we need to
+      // insert the previous pixel value (from t1).
+      // "next" is current row shifted left by 1 pixel, with first pixel
+      // of next block of 8 pixels added in.
+      int16x8_t prv0 = vextq_s16(curr, curr, 7);
+      int16x8_t nxt0 = vextq_s16(curr, curr, 1);
+      int16x8_t prev = vsetq_lane_s16(t1, prv0, 0);
+      int16x8_t next = vsetq_lane_s16(3*in_near[i+8] + in_far[i+8], nxt0, 7);
+
+      // horizontal filter, polyphase implementation since it's convenient:
+      // even pixels = 3*cur + prev = cur*4 + (prev - cur)
+      // odd  pixels = 3*cur + next = cur*4 + (next - cur)
+      // note the shared term.
+      int16x8_t curs = vshlq_n_s16(curr, 2);
+      int16x8_t prvd = vsubq_s16(prev, curr);
+      int16x8_t nxtd = vsubq_s16(next, curr);
+      int16x8_t even = vaddq_s16(curs, prvd);
+      int16x8_t odd  = vaddq_s16(curs, nxtd);
+
+      // undo scaling and round, then store with even/odd phases interleaved
+      uint8x8x2_t o;
+      o.val[0] = vqrshrun_n_s16(even, 4);
+      o.val[1] = vqrshrun_n_s16(odd,  4);
+      vst2_u8(out + i*2, o);
+#endif
+
+      // "previous" value for next iter
+      t1 = 3*in_near[i+7] + in_far[i+7];
+   }
+
+   t0 = t1;
+   t1 = 3*in_near[i] + in_far[i];
+   out[i*2] = stbi__div16(3*t1 + t0 + 8);
+
+   for (++i; i < w; ++i) {
+      t0 = t1;
+      t1 = 3*in_near[i]+in_far[i];
+      out[i*2-1] = stbi__div16(3*t0 + t1 + 8);
+      out[i*2  ] = stbi__div16(3*t1 + t0 + 8);
+   }
+   out[w*2-1] = stbi__div4(t1+2);
+
+   STBI_NOTUSED(hs);
+
+   return out;
+}
+#endif
+
+static stbi_uc *stbi__resample_row_generic(stbi_uc *out, stbi_uc *in_near, stbi_uc *in_far, int w, int hs)
+{
+   // resample with nearest-neighbor
+   int i,j;
+   STBI_NOTUSED(in_far);
+   for (i=0; i < w; ++i)
+      for (j=0; j < hs; ++j)
+         out[i*hs+j] = in_near[i];
+   return out;
+}
+
+#ifdef STBI_JPEG_OLD
+// this is the same YCbCr-to-RGB calculation that stb_image has used
+// historically before the algorithm changes in 1.49
+#define float2fixed(x)  ((int) ((x) * 65536 + 0.5))
+static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step)
+{
+   int i;
+   for (i=0; i < count; ++i) {
+      int y_fixed = (y[i] << 16) + 32768; // rounding
+      int r,g,b;
+      int cr = pcr[i] - 128;
+      int cb = pcb[i] - 128;
+      r = y_fixed + cr*float2fixed(1.40200f);
+      g = y_fixed - cr*float2fixed(0.71414f) - cb*float2fixed(0.34414f);
+      b = y_fixed                            + cb*float2fixed(1.77200f);
+      r >>= 16;
+      g >>= 16;
+      b >>= 16;
+      if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+      if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+      if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+      out[0] = (stbi_uc)r;
+      out[1] = (stbi_uc)g;
+      out[2] = (stbi_uc)b;
+      out[3] = 255;
+      out += step;
+   }
+}
+#else
+// this is a reduced-precision calculation of YCbCr-to-RGB introduced
+// to make sure the code produces the same results in both SIMD and scalar
+#define float2fixed(x)  (((int) ((x) * 4096.0f + 0.5f)) << 8)
+static void stbi__YCbCr_to_RGB_row(stbi_uc *out, const stbi_uc *y, const stbi_uc *pcb, const stbi_uc *pcr, int count, int step)
+{
+   int i;
+   for (i=0; i < count; ++i) {
+      int y_fixed = (y[i] << 20) + (1<<19); // rounding
+      int r,g,b;
+      int cr = pcr[i] - 128;
+      int cb = pcb[i] - 128;
+      r = y_fixed +  cr* float2fixed(1.40200f);
+      g = y_fixed + (cr*-float2fixed(0.71414f)) + ((cb*-float2fixed(0.34414f)) & 0xffff0000);
+      b = y_fixed                               +   cb* float2fixed(1.77200f);
+      r >>= 20;
+      g >>= 20;
+      b >>= 20;
+      if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+      if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+      if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+      out[0] = (stbi_uc)r;
+      out[1] = (stbi_uc)g;
+      out[2] = (stbi_uc)b;
+      out[3] = 255;
+      out += step;
+   }
+}
+#endif
+
+#if defined(STBI_SSE2) || defined(STBI_NEON)
+static void stbi__YCbCr_to_RGB_simd(stbi_uc *out, stbi_uc const *y, stbi_uc const *pcb, stbi_uc const *pcr, int count, int step)
+{
+   int i = 0;
+
+#ifdef STBI_SSE2
+   // step == 3 is pretty ugly on the final interleave, and i'm not convinced
+   // it's useful in practice (you wouldn't use it for textures, for example).
+   // so just accelerate step == 4 case.
+   if (step == 4) {
+      // this is a fairly straightforward implementation and not super-optimized.
+      __m128i signflip  = _mm_set1_epi8(-0x80);
+      __m128i cr_const0 = _mm_set1_epi16(   (short) ( 1.40200f*4096.0f+0.5f));
+      __m128i cr_const1 = _mm_set1_epi16( - (short) ( 0.71414f*4096.0f+0.5f));
+      __m128i cb_const0 = _mm_set1_epi16( - (short) ( 0.34414f*4096.0f+0.5f));
+      __m128i cb_const1 = _mm_set1_epi16(   (short) ( 1.77200f*4096.0f+0.5f));
+      __m128i y_bias = _mm_set1_epi8((char) (unsigned char) 128);
+      __m128i xw = _mm_set1_epi16(255); // alpha channel
+
+      for (; i+7 < count; i += 8) {
+         // load
+         __m128i y_bytes = _mm_loadl_epi64((__m128i *) (y+i));
+         __m128i cr_bytes = _mm_loadl_epi64((__m128i *) (pcr+i));
+         __m128i cb_bytes = _mm_loadl_epi64((__m128i *) (pcb+i));
+         __m128i cr_biased = _mm_xor_si128(cr_bytes, signflip); // -128
+         __m128i cb_biased = _mm_xor_si128(cb_bytes, signflip); // -128
+
+         // unpack to short (and left-shift cr, cb by 8)
+         __m128i yw  = _mm_unpacklo_epi8(y_bias, y_bytes);
+         __m128i crw = _mm_unpacklo_epi8(_mm_setzero_si128(), cr_biased);
+         __m128i cbw = _mm_unpacklo_epi8(_mm_setzero_si128(), cb_biased);
+
+         // color transform
+         __m128i yws = _mm_srli_epi16(yw, 4);
+         __m128i cr0 = _mm_mulhi_epi16(cr_const0, crw);
+         __m128i cb0 = _mm_mulhi_epi16(cb_const0, cbw);
+         __m128i cb1 = _mm_mulhi_epi16(cbw, cb_const1);
+         __m128i cr1 = _mm_mulhi_epi16(crw, cr_const1);
+         __m128i rws = _mm_add_epi16(cr0, yws);
+         __m128i gwt = _mm_add_epi16(cb0, yws);
+         __m128i bws = _mm_add_epi16(yws, cb1);
+         __m128i gws = _mm_add_epi16(gwt, cr1);
+
+         // descale
+         __m128i rw = _mm_srai_epi16(rws, 4);
+         __m128i bw = _mm_srai_epi16(bws, 4);
+         __m128i gw = _mm_srai_epi16(gws, 4);
+
+         // back to byte, set up for transpose
+         __m128i brb = _mm_packus_epi16(rw, bw);
+         __m128i gxb = _mm_packus_epi16(gw, xw);
+
+         // transpose to interleave channels
+         __m128i t0 = _mm_unpacklo_epi8(brb, gxb);
+         __m128i t1 = _mm_unpackhi_epi8(brb, gxb);
+         __m128i o0 = _mm_unpacklo_epi16(t0, t1);
+         __m128i o1 = _mm_unpackhi_epi16(t0, t1);
+
+         // store
+         _mm_storeu_si128((__m128i *) (out + 0), o0);
+         _mm_storeu_si128((__m128i *) (out + 16), o1);
+         out += 32;
+      }
+   }
+#endif
+
+#ifdef STBI_NEON
+   // in this version, step=3 support would be easy to add. but is there demand?
+   if (step == 4) {
+      // this is a fairly straightforward implementation and not super-optimized.
+      uint8x8_t signflip = vdup_n_u8(0x80);
+      int16x8_t cr_const0 = vdupq_n_s16(   (short) ( 1.40200f*4096.0f+0.5f));
+      int16x8_t cr_const1 = vdupq_n_s16( - (short) ( 0.71414f*4096.0f+0.5f));
+      int16x8_t cb_const0 = vdupq_n_s16( - (short) ( 0.34414f*4096.0f+0.5f));
+      int16x8_t cb_const1 = vdupq_n_s16(   (short) ( 1.77200f*4096.0f+0.5f));
+
+      for (; i+7 < count; i += 8) {
+         // load
+         uint8x8_t y_bytes  = vld1_u8(y + i);
+         uint8x8_t cr_bytes = vld1_u8(pcr + i);
+         uint8x8_t cb_bytes = vld1_u8(pcb + i);
+         int8x8_t cr_biased = vreinterpret_s8_u8(vsub_u8(cr_bytes, signflip));
+         int8x8_t cb_biased = vreinterpret_s8_u8(vsub_u8(cb_bytes, signflip));
+
+         // expand to s16
+         int16x8_t yws = vreinterpretq_s16_u16(vshll_n_u8(y_bytes, 4));
+         int16x8_t crw = vshll_n_s8(cr_biased, 7);
+         int16x8_t cbw = vshll_n_s8(cb_biased, 7);
+
+         // color transform
+         int16x8_t cr0 = vqdmulhq_s16(crw, cr_const0);
+         int16x8_t cb0 = vqdmulhq_s16(cbw, cb_const0);
+         int16x8_t cr1 = vqdmulhq_s16(crw, cr_const1);
+         int16x8_t cb1 = vqdmulhq_s16(cbw, cb_const1);
+         int16x8_t rws = vaddq_s16(yws, cr0);
+         int16x8_t gws = vaddq_s16(vaddq_s16(yws, cb0), cr1);
+         int16x8_t bws = vaddq_s16(yws, cb1);
+
+         // undo scaling, round, convert to byte
+         uint8x8x4_t o;
+         o.val[0] = vqrshrun_n_s16(rws, 4);
+         o.val[1] = vqrshrun_n_s16(gws, 4);
+         o.val[2] = vqrshrun_n_s16(bws, 4);
+         o.val[3] = vdup_n_u8(255);
+
+         // store, interleaving r/g/b/a
+         vst4_u8(out, o);
+         out += 8*4;
+      }
+   }
+#endif
+
+   for (; i < count; ++i) {
+      int y_fixed = (y[i] << 20) + (1<<19); // rounding
+      int r,g,b;
+      int cr = pcr[i] - 128;
+      int cb = pcb[i] - 128;
+      r = y_fixed + cr* float2fixed(1.40200f);
+      g = y_fixed + cr*-float2fixed(0.71414f) + ((cb*-float2fixed(0.34414f)) & 0xffff0000);
+      b = y_fixed                             +   cb* float2fixed(1.77200f);
+      r >>= 20;
+      g >>= 20;
+      b >>= 20;
+      if ((unsigned) r > 255) { if (r < 0) r = 0; else r = 255; }
+      if ((unsigned) g > 255) { if (g < 0) g = 0; else g = 255; }
+      if ((unsigned) b > 255) { if (b < 0) b = 0; else b = 255; }
+      out[0] = (stbi_uc)r;
+      out[1] = (stbi_uc)g;
+      out[2] = (stbi_uc)b;
+      out[3] = 255;
+      out += step;
+   }
+}
+#endif
+
+// set up the kernels
+static void stbi__setup_jpeg(stbi__jpeg *j)
+{
+   j->idct_block_kernel = stbi__idct_block;
+   j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_row;
+   j->resample_row_hv_2_kernel = stbi__resample_row_hv_2;
+
+#ifdef STBI_SSE2
+   if (stbi__sse2_available()) {
+      j->idct_block_kernel = stbi__idct_simd;
+      #ifndef STBI_JPEG_OLD
+      j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+      #endif
+      j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+   }
+#endif
+
+#ifdef STBI_NEON
+   j->idct_block_kernel = stbi__idct_simd;
+   #ifndef STBI_JPEG_OLD
+   j->YCbCr_to_RGB_kernel = stbi__YCbCr_to_RGB_simd;
+   #endif
+   j->resample_row_hv_2_kernel = stbi__resample_row_hv_2_simd;
+#endif
+}
+
+// clean up the temporary component buffers
+static void stbi__cleanup_jpeg(stbi__jpeg *j)
+{
+   int i;
+   for (i=0; i < j->s->img_n; ++i) {
+      if (j->img_comp[i].raw_data) {
+         STBI_FREE(j->img_comp[i].raw_data);
+         j->img_comp[i].raw_data = NULL;
+         j->img_comp[i].data = NULL;
+      }
+      if (j->img_comp[i].raw_coeff) {
+         STBI_FREE(j->img_comp[i].raw_coeff);
+         j->img_comp[i].raw_coeff = 0;
+         j->img_comp[i].coeff = 0;
+      }
+      if (j->img_comp[i].linebuf) {
+         STBI_FREE(j->img_comp[i].linebuf);
+         j->img_comp[i].linebuf = NULL;
+      }
+   }
+}
+
+typedef struct
+{
+   resample_row_func resample;
+   stbi_uc *line0,*line1;
+   int hs,vs;   // expansion factor in each axis
+   int w_lores; // horizontal pixels pre-expansion
+   int ystep;   // how far through vertical expansion we are
+   int ypos;    // which pre-expansion row we're on
+} stbi__resample;
+
+static stbi_uc *load_jpeg_image(stbi__jpeg *z, int *out_x, int *out_y, int *comp, int req_comp)
+{
+   int n, decode_n;
+   z->s->img_n = 0; // make stbi__cleanup_jpeg safe
+
+   // validate req_comp
+   if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+
+   // load a jpeg image from whichever source, but leave in YCbCr format
+   if (!stbi__decode_jpeg_image(z)) { stbi__cleanup_jpeg(z); return NULL; }
+
+   // determine actual number of components to generate
+   n = req_comp ? req_comp : z->s->img_n;
+
+   if (z->s->img_n == 3 && n < 3)
+      decode_n = 1;
+   else
+      decode_n = z->s->img_n;
+
+   // resample and color-convert
+   {
+      int k;
+      unsigned int i,j;
+      stbi_uc *output;
+      stbi_uc *coutput[4];
+
+      stbi__resample res_comp[4];
+
+      for (k=0; k < decode_n; ++k) {
+         stbi__resample *r = &res_comp[k];
+
+         // allocate line buffer big enough for upsampling off the edges
+         // with upsample factor of 4
+         z->img_comp[k].linebuf = (stbi_uc *) stbi__malloc(z->s->img_x + 3);
+         if (!z->img_comp[k].linebuf) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
+
+         r->hs      = z->img_h_max / z->img_comp[k].h;
+         r->vs      = z->img_v_max / z->img_comp[k].v;
+         r->ystep   = r->vs >> 1;
+         r->w_lores = (z->s->img_x + r->hs-1) / r->hs;
+         r->ypos    = 0;
+         r->line0   = r->line1 = z->img_comp[k].data;
+
+         if      (r->hs == 1 && r->vs == 1) r->resample = resample_row_1;
+         else if (r->hs == 1 && r->vs == 2) r->resample = stbi__resample_row_v_2;
+         else if (r->hs == 2 && r->vs == 1) r->resample = stbi__resample_row_h_2;
+         else if (r->hs == 2 && r->vs == 2) r->resample = z->resample_row_hv_2_kernel;
+         else                               r->resample = stbi__resample_row_generic;
+      }
+
+      // can't error after this so, this is safe
+      output = (stbi_uc *) stbi__malloc(n * z->s->img_x * z->s->img_y + 1);
+      if (!output) { stbi__cleanup_jpeg(z); return stbi__errpuc("outofmem", "Out of memory"); }
+
+      // now go ahead and resample
+      for (j=0; j < z->s->img_y; ++j) {
+         stbi_uc *out = output + n * z->s->img_x * j;
+         for (k=0; k < decode_n; ++k) {
+            stbi__resample *r = &res_comp[k];
+            int y_bot = r->ystep >= (r->vs >> 1);
+            coutput[k] = r->resample(z->img_comp[k].linebuf,
+                                     y_bot ? r->line1 : r->line0,
+                                     y_bot ? r->line0 : r->line1,
+                                     r->w_lores, r->hs);
+            if (++r->ystep >= r->vs) {
+               r->ystep = 0;
+               r->line0 = r->line1;
+               if (++r->ypos < z->img_comp[k].y)
+                  r->line1 += z->img_comp[k].w2;
+            }
+         }
+         if (n >= 3) {
+            stbi_uc *y = coutput[0];
+            if (z->s->img_n == 3) {
+               z->YCbCr_to_RGB_kernel(out, y, coutput[1], coutput[2], z->s->img_x, n);
+            } else
+               for (i=0; i < z->s->img_x; ++i) {
+                  out[0] = out[1] = out[2] = y[i];
+                  out[3] = 255; // not used if n==3
+                  out += n;
+               }
+         } else {
+            stbi_uc *y = coutput[0];
+            if (n == 1)
+               for (i=0; i < z->s->img_x; ++i) out[i] = y[i];
+            else
+               for (i=0; i < z->s->img_x; ++i) *out++ = y[i], *out++ = 255;
+         }
+      }
+      stbi__cleanup_jpeg(z);
+      *out_x = z->s->img_x;
+      *out_y = z->s->img_y;
+      if (comp) *comp  = z->s->img_n; // report original components, not output
+      return output;
+   }
+}
+
+static unsigned char *stbi__jpeg_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__jpeg j;
+   j.s = s;
+   stbi__setup_jpeg(&j);
+   return load_jpeg_image(&j, x,y,comp,req_comp);
+}
+
+static int stbi__jpeg_test(stbi__context *s)
+{
+   int r;
+   stbi__jpeg j;
+   j.s = s;
+   stbi__setup_jpeg(&j);
+   r = stbi__decode_jpeg_header(&j, STBI__SCAN_type);
+   stbi__rewind(s);
+   return r;
+}
+
+static int stbi__jpeg_info_raw(stbi__jpeg *j, int *x, int *y, int *comp)
+{
+   if (!stbi__decode_jpeg_header(j, STBI__SCAN_header)) {
+      stbi__rewind( j->s );
+      return 0;
+   }
+   if (x) *x = j->s->img_x;
+   if (y) *y = j->s->img_y;
+   if (comp) *comp = j->s->img_n;
+   return 1;
+}
+
+static int stbi__jpeg_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   stbi__jpeg j;
+   j.s = s;
+   return stbi__jpeg_info_raw(&j, x, y, comp);
+}
+#endif
+
+// public domain zlib decode    v0.2  Sean Barrett 2006-11-18
+//    simple implementation
+//      - all input must be provided in an upfront buffer
+//      - all output is written to a single output buffer (can malloc/realloc)
+//    performance
+//      - fast huffman
+
+#ifndef STBI_NO_ZLIB
+
+// fast-way is faster to check than jpeg huffman, but slow way is slower
+#define STBI__ZFAST_BITS  9 // accelerate all cases in default tables
+#define STBI__ZFAST_MASK  ((1 << STBI__ZFAST_BITS) - 1)
+
+// zlib-style huffman encoding
+// (jpegs packs from left, zlib from right, so can't share code)
+typedef struct
+{
+   stbi__uint16 fast[1 << STBI__ZFAST_BITS];
+   stbi__uint16 firstcode[16];
+   int maxcode[17];
+   stbi__uint16 firstsymbol[16];
+   stbi_uc  size[288];
+   stbi__uint16 value[288];
+} stbi__zhuffman;
+
+stbi_inline static int stbi__bitreverse16(int n)
+{
+  n = ((n & 0xAAAA) >>  1) | ((n & 0x5555) << 1);
+  n = ((n & 0xCCCC) >>  2) | ((n & 0x3333) << 2);
+  n = ((n & 0xF0F0) >>  4) | ((n & 0x0F0F) << 4);
+  n = ((n & 0xFF00) >>  8) | ((n & 0x00FF) << 8);
+  return n;
+}
+
+stbi_inline static int stbi__bit_reverse(int v, int bits)
+{
+   STBI_ASSERT(bits <= 16);
+   // to bit reverse n bits, reverse 16 and shift
+   // e.g. 11 bits, bit reverse and shift away 5
+   return stbi__bitreverse16(v) >> (16-bits);
+}
+
+static int stbi__zbuild_huffman(stbi__zhuffman *z, stbi_uc *sizelist, int num)
+{
+   int i,k=0;
+   int code, next_code[16], sizes[17];
+
+   // DEFLATE spec for generating codes
+   memset(sizes, 0, sizeof(sizes));
+   memset(z->fast, 0, sizeof(z->fast));
+   for (i=0; i < num; ++i)
+      ++sizes[sizelist[i]];
+   sizes[0] = 0;
+   for (i=1; i < 16; ++i)
+      if (sizes[i] > (1 << i))
+         return stbi__err("bad sizes", "Corrupt PNG");
+   code = 0;
+   for (i=1; i < 16; ++i) {
+      next_code[i] = code;
+      z->firstcode[i] = (stbi__uint16) code;
+      z->firstsymbol[i] = (stbi__uint16) k;
+      code = (code + sizes[i]);
+      if (sizes[i])
+         if (code-1 >= (1 << i)) return stbi__err("bad codelengths","Corrupt PNG");
+      z->maxcode[i] = code << (16-i); // preshift for inner loop
+      code <<= 1;
+      k += sizes[i];
+   }
+   z->maxcode[16] = 0x10000; // sentinel
+   for (i=0; i < num; ++i) {
+      int s = sizelist[i];
+      if (s) {
+         int c = next_code[s] - z->firstcode[s] + z->firstsymbol[s];
+         stbi__uint16 fastv = (stbi__uint16) ((s << 9) | i);
+         z->size [c] = (stbi_uc     ) s;
+         z->value[c] = (stbi__uint16) i;
+         if (s <= STBI__ZFAST_BITS) {
+            int j = stbi__bit_reverse(next_code[s],s);
+            while (j < (1 << STBI__ZFAST_BITS)) {
+               z->fast[j] = fastv;
+               j += (1 << s);
+            }
+         }
+         ++next_code[s];
+      }
+   }
+   return 1;
+}
+
+// zlib-from-memory implementation for PNG reading
+//    because PNG allows splitting the zlib stream arbitrarily,
+//    and it's annoying structurally to have PNG call ZLIB call PNG,
+//    we require PNG read all the IDATs and combine them into a single
+//    memory buffer
+
+typedef struct
+{
+   stbi_uc *zbuffer, *zbuffer_end;
+   int num_bits;
+   stbi__uint32 code_buffer;
+
+   char *zout;
+   char *zout_start;
+   char *zout_end;
+   int   z_expandable;
+
+   stbi__zhuffman z_length, z_distance;
+} stbi__zbuf;
+
+stbi_inline static stbi_uc stbi__zget8(stbi__zbuf *z)
+{
+   if (z->zbuffer >= z->zbuffer_end) return 0;
+   return *z->zbuffer++;
+}
+
+static void stbi__fill_bits(stbi__zbuf *z)
+{
+   do {
+      STBI_ASSERT(z->code_buffer < (1U << z->num_bits));
+      z->code_buffer |= (unsigned int) stbi__zget8(z) << z->num_bits;
+      z->num_bits += 8;
+   } while (z->num_bits <= 24);
+}
+
+stbi_inline static unsigned int stbi__zreceive(stbi__zbuf *z, int n)
+{
+   unsigned int k;
+   if (z->num_bits < n) stbi__fill_bits(z);
+   k = z->code_buffer & ((1 << n) - 1);
+   z->code_buffer >>= n;
+   z->num_bits -= n;
+   return k;
+}
+
+static int stbi__zhuffman_decode_slowpath(stbi__zbuf *a, stbi__zhuffman *z)
+{
+   int b,s,k;
+   // not resolved by fast table, so compute it the slow way
+   // use jpeg approach, which requires MSbits at top
+   k = stbi__bit_reverse(a->code_buffer, 16);
+   for (s=STBI__ZFAST_BITS+1; ; ++s)
+      if (k < z->maxcode[s])
+         break;
+   if (s == 16) return -1; // invalid code!
+   // code size is s, so:
+   b = (k >> (16-s)) - z->firstcode[s] + z->firstsymbol[s];
+   STBI_ASSERT(z->size[b] == s);
+   a->code_buffer >>= s;
+   a->num_bits -= s;
+   return z->value[b];
+}
+
+stbi_inline static int stbi__zhuffman_decode(stbi__zbuf *a, stbi__zhuffman *z)
+{
+   int b,s;
+   if (a->num_bits < 16) stbi__fill_bits(a);
+   b = z->fast[a->code_buffer & STBI__ZFAST_MASK];
+   if (b) {
+      s = b >> 9;
+      a->code_buffer >>= s;
+      a->num_bits -= s;
+      return b & 511;
+   }
+   return stbi__zhuffman_decode_slowpath(a, z);
+}
+
+static int stbi__zexpand(stbi__zbuf *z, char *zout, int n)  // need to make room for n bytes
+{
+   char *q;
+   int cur, limit, old_limit;
+   z->zout = zout;
+   if (!z->z_expandable) return stbi__err("output buffer limit","Corrupt PNG");
+   cur   = (int) (z->zout     - z->zout_start);
+   limit = old_limit = (int) (z->zout_end - z->zout_start);
+   while (cur + n > limit)
+      limit *= 2;
+   q = (char *) STBI_REALLOC_SIZED(z->zout_start, old_limit, limit);
+   STBI_NOTUSED(old_limit);
+   if (q == NULL) return stbi__err("outofmem", "Out of memory");
+   z->zout_start = q;
+   z->zout       = q + cur;
+   z->zout_end   = q + limit;
+   return 1;
+}
+
+static int stbi__zlength_base[31] = {
+   3,4,5,6,7,8,9,10,11,13,
+   15,17,19,23,27,31,35,43,51,59,
+   67,83,99,115,131,163,195,227,258,0,0 };
+
+static int stbi__zlength_extra[31]=
+{ 0,0,0,0,0,0,0,0,1,1,1,1,2,2,2,2,3,3,3,3,4,4,4,4,5,5,5,5,0,0,0 };
+
+static int stbi__zdist_base[32] = { 1,2,3,4,5,7,9,13,17,25,33,49,65,97,129,193,
+257,385,513,769,1025,1537,2049,3073,4097,6145,8193,12289,16385,24577,0,0};
+
+static int stbi__zdist_extra[32] =
+{ 0,0,0,0,1,1,2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,13,13};
+
+static int stbi__parse_huffman_block(stbi__zbuf *a)
+{
+   char *zout = a->zout;
+   for(;;) {
+      int z = stbi__zhuffman_decode(a, &a->z_length);
+      if (z < 256) {
+         if (z < 0) return stbi__err("bad huffman code","Corrupt PNG"); // error in huffman codes
+         if (zout >= a->zout_end) {
+            if (!stbi__zexpand(a, zout, 1)) return 0;
+            zout = a->zout;
+         }
+         *zout++ = (char) z;
+      } else {
+         stbi_uc *p;
+         int len,dist;
+         if (z == 256) {
+            a->zout = zout;
+            return 1;
+         }
+         z -= 257;
+         len = stbi__zlength_base[z];
+         if (stbi__zlength_extra[z]) len += stbi__zreceive(a, stbi__zlength_extra[z]);
+         z = stbi__zhuffman_decode(a, &a->z_distance);
+         if (z < 0) return stbi__err("bad huffman code","Corrupt PNG");
+         dist = stbi__zdist_base[z];
+         if (stbi__zdist_extra[z]) dist += stbi__zreceive(a, stbi__zdist_extra[z]);
+         if (zout - a->zout_start < dist) return stbi__err("bad dist","Corrupt PNG");
+         if (zout + len > a->zout_end) {
+            if (!stbi__zexpand(a, zout, len)) return 0;
+            zout = a->zout;
+         }
+         p = (stbi_uc *) (zout - dist);
+         if (dist == 1) { // run of one byte; common in images.
+            stbi_uc v = *p;
+            if (len) { do *zout++ = v; while (--len); }
+         } else {
+            if (len) { do *zout++ = *p++; while (--len); }
+         }
+      }
+   }
+}
+
+static int stbi__compute_huffman_codes(stbi__zbuf *a)
+{
+   static stbi_uc length_dezigzag[19] = { 16,17,18,0,8,7,9,6,10,5,11,4,12,3,13,2,14,1,15 };
+   stbi__zhuffman z_codelength;
+   stbi_uc lencodes[286+32+137];//padding for maximum single op
+   stbi_uc codelength_sizes[19];
+   int i,n;
+
+   int hlit  = stbi__zreceive(a,5) + 257;
+   int hdist = stbi__zreceive(a,5) + 1;
+   int hclen = stbi__zreceive(a,4) + 4;
+
+   memset(codelength_sizes, 0, sizeof(codelength_sizes));
+   for (i=0; i < hclen; ++i) {
+      int s = stbi__zreceive(a,3);
+      codelength_sizes[length_dezigzag[i]] = (stbi_uc) s;
+   }
+   if (!stbi__zbuild_huffman(&z_codelength, codelength_sizes, 19)) return 0;
+
+   n = 0;
+   while (n < hlit + hdist) {
+      int c = stbi__zhuffman_decode(a, &z_codelength);
+      if (c < 0 || c >= 19) return stbi__err("bad codelengths", "Corrupt PNG");
+      if (c < 16)
+         lencodes[n++] = (stbi_uc) c;
+      else if (c == 16) {
+         c = stbi__zreceive(a,2)+3;
+         memset(lencodes+n, lencodes[n-1], c);
+         n += c;
+      } else if (c == 17) {
+         c = stbi__zreceive(a,3)+3;
+         memset(lencodes+n, 0, c);
+         n += c;
+      } else {
+         STBI_ASSERT(c == 18);
+         c = stbi__zreceive(a,7)+11;
+         memset(lencodes+n, 0, c);
+         n += c;
+      }
+   }
+   if (n != hlit+hdist) return stbi__err("bad codelengths","Corrupt PNG");
+   if (!stbi__zbuild_huffman(&a->z_length, lencodes, hlit)) return 0;
+   if (!stbi__zbuild_huffman(&a->z_distance, lencodes+hlit, hdist)) return 0;
+   return 1;
+}
+
+static int stbi__parse_uncomperssed_block(stbi__zbuf *a)
+{
+   stbi_uc header[4];
+   int len,nlen,k;
+   if (a->num_bits & 7)
+      stbi__zreceive(a, a->num_bits & 7); // discard
+   // drain the bit-packed data into header
+   k = 0;
+   while (a->num_bits > 0) {
+      header[k++] = (stbi_uc) (a->code_buffer & 255); // suppress MSVC run-time check
+      a->code_buffer >>= 8;
+      a->num_bits -= 8;
+   }
+   STBI_ASSERT(a->num_bits == 0);
+   // now fill header the normal way
+   while (k < 4)
+      header[k++] = stbi__zget8(a);
+   len  = header[1] * 256 + header[0];
+   nlen = header[3] * 256 + header[2];
+   if (nlen != (len ^ 0xffff)) return stbi__err("zlib corrupt","Corrupt PNG");
+   if (a->zbuffer + len > a->zbuffer_end) return stbi__err("read past buffer","Corrupt PNG");
+   if (a->zout + len > a->zout_end)
+      if (!stbi__zexpand(a, a->zout, len)) return 0;
+   memcpy(a->zout, a->zbuffer, len);
+   a->zbuffer += len;
+   a->zout += len;
+   return 1;
+}
+
+static int stbi__parse_zlib_header(stbi__zbuf *a)
+{
+   int cmf   = stbi__zget8(a);
+   int cm    = cmf & 15;
+   /* int cinfo = cmf >> 4; */
+   int flg   = stbi__zget8(a);
+   if ((cmf*256+flg) % 31 != 0) return stbi__err("bad zlib header","Corrupt PNG"); // zlib spec
+   if (flg & 32) return stbi__err("no preset dict","Corrupt PNG"); // preset dictionary not allowed in png
+   if (cm != 8) return stbi__err("bad compression","Corrupt PNG"); // DEFLATE required for png
+   // window = 1 << (8 + cinfo)... but who cares, we fully buffer output
+   return 1;
+}
+
+// @TODO: should statically initialize these for optimal thread safety
+static stbi_uc stbi__zdefault_length[288], stbi__zdefault_distance[32];
+static void stbi__init_zdefaults(void)
+{
+   int i;   // use <= to match clearly with spec
+   for (i=0; i <= 143; ++i)     stbi__zdefault_length[i]   = 8;
+   for (   ; i <= 255; ++i)     stbi__zdefault_length[i]   = 9;
+   for (   ; i <= 279; ++i)     stbi__zdefault_length[i]   = 7;
+   for (   ; i <= 287; ++i)     stbi__zdefault_length[i]   = 8;
+
+   for (i=0; i <=  31; ++i)     stbi__zdefault_distance[i] = 5;
+}
+
+static int stbi__parse_zlib(stbi__zbuf *a, int parse_header)
+{
+   int final, type;
+   if (parse_header)
+      if (!stbi__parse_zlib_header(a)) return 0;
+   a->num_bits = 0;
+   a->code_buffer = 0;
+   do {
+      final = stbi__zreceive(a,1);
+      type = stbi__zreceive(a,2);
+      if (type == 0) {
+         if (!stbi__parse_uncomperssed_block(a)) return 0;
+      } else if (type == 3) {
+         return 0;
+      } else {
+         if (type == 1) {
+            // use fixed code lengths
+            if (!stbi__zdefault_distance[31]) stbi__init_zdefaults();
+            if (!stbi__zbuild_huffman(&a->z_length  , stbi__zdefault_length  , 288)) return 0;
+            if (!stbi__zbuild_huffman(&a->z_distance, stbi__zdefault_distance,  32)) return 0;
+         } else {
+            if (!stbi__compute_huffman_codes(a)) return 0;
+         }
+         if (!stbi__parse_huffman_block(a)) return 0;
+      }
+   } while (!final);
+   return 1;
+}
+
+static int stbi__do_zlib(stbi__zbuf *a, char *obuf, int olen, int exp, int parse_header)
+{
+   a->zout_start = obuf;
+   a->zout       = obuf;
+   a->zout_end   = obuf + olen;
+   a->z_expandable = exp;
+
+   return stbi__parse_zlib(a, parse_header);
+}
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize(const char *buffer, int len, int initial_size, int *outlen)
+{
+   stbi__zbuf a;
+   char *p = (char *) stbi__malloc(initial_size);
+   if (p == NULL) return NULL;
+   a.zbuffer = (stbi_uc *) buffer;
+   a.zbuffer_end = (stbi_uc *) buffer + len;
+   if (stbi__do_zlib(&a, p, initial_size, 1, 1)) {
+      if (outlen) *outlen = (int) (a.zout - a.zout_start);
+      return a.zout_start;
+   } else {
+      STBI_FREE(a.zout_start);
+      return NULL;
+   }
+}
+
+STBIDEF char *stbi_zlib_decode_malloc(char const *buffer, int len, int *outlen)
+{
+   return stbi_zlib_decode_malloc_guesssize(buffer, len, 16384, outlen);
+}
+
+STBIDEF char *stbi_zlib_decode_malloc_guesssize_headerflag(const char *buffer, int len, int initial_size, int *outlen, int parse_header)
+{
+   stbi__zbuf a;
+   char *p = (char *) stbi__malloc(initial_size);
+   if (p == NULL) return NULL;
+   a.zbuffer = (stbi_uc *) buffer;
+   a.zbuffer_end = (stbi_uc *) buffer + len;
+   if (stbi__do_zlib(&a, p, initial_size, 1, parse_header)) {
+      if (outlen) *outlen = (int) (a.zout - a.zout_start);
+      return a.zout_start;
+   } else {
+      STBI_FREE(a.zout_start);
+      return NULL;
+   }
+}
+
+STBIDEF int stbi_zlib_decode_buffer(char *obuffer, int olen, char const *ibuffer, int ilen)
+{
+   stbi__zbuf a;
+   a.zbuffer = (stbi_uc *) ibuffer;
+   a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
+   if (stbi__do_zlib(&a, obuffer, olen, 0, 1))
+      return (int) (a.zout - a.zout_start);
+   else
+      return -1;
+}
+
+STBIDEF char *stbi_zlib_decode_noheader_malloc(char const *buffer, int len, int *outlen)
+{
+   stbi__zbuf a;
+   char *p = (char *) stbi__malloc(16384);
+   if (p == NULL) return NULL;
+   a.zbuffer = (stbi_uc *) buffer;
+   a.zbuffer_end = (stbi_uc *) buffer+len;
+   if (stbi__do_zlib(&a, p, 16384, 1, 0)) {
+      if (outlen) *outlen = (int) (a.zout - a.zout_start);
+      return a.zout_start;
+   } else {
+      STBI_FREE(a.zout_start);
+      return NULL;
+   }
+}
+
+STBIDEF int stbi_zlib_decode_noheader_buffer(char *obuffer, int olen, const char *ibuffer, int ilen)
+{
+   stbi__zbuf a;
+   a.zbuffer = (stbi_uc *) ibuffer;
+   a.zbuffer_end = (stbi_uc *) ibuffer + ilen;
+   if (stbi__do_zlib(&a, obuffer, olen, 0, 0))
+      return (int) (a.zout - a.zout_start);
+   else
+      return -1;
+}
+#endif
+
+// public domain "baseline" PNG decoder   v0.10  Sean Barrett 2006-11-18
+//    simple implementation
+//      - only 8-bit samples
+//      - no CRC checking
+//      - allocates lots of intermediate memory
+//        - avoids problem of streaming data between subsystems
+//        - avoids explicit window management
+//    performance
+//      - uses stb_zlib, a PD zlib implementation with fast huffman decoding
+
+#ifndef STBI_NO_PNG
+typedef struct
+{
+   stbi__uint32 length;
+   stbi__uint32 type;
+} stbi__pngchunk;
+
+static stbi__pngchunk stbi__get_chunk_header(stbi__context *s)
+{
+   stbi__pngchunk c;
+   c.length = stbi__get32be(s);
+   c.type   = stbi__get32be(s);
+   return c;
+}
+
+static int stbi__check_png_header(stbi__context *s)
+{
+   static stbi_uc png_sig[8] = { 137,80,78,71,13,10,26,10 };
+   int i;
+   for (i=0; i < 8; ++i)
+      if (stbi__get8(s) != png_sig[i]) return stbi__err("bad png sig","Not a PNG");
+   return 1;
+}
+
+typedef struct
+{
+   stbi__context *s;
+   stbi_uc *idata, *expanded, *out;
+} stbi__png;
+
+
+enum {
+   STBI__F_none=0,
+   STBI__F_sub=1,
+   STBI__F_up=2,
+   STBI__F_avg=3,
+   STBI__F_paeth=4,
+   // synthetic filters used for first scanline to avoid needing a dummy row of 0s
+   STBI__F_avg_first,
+   STBI__F_paeth_first
+};
+
+static stbi_uc first_row_filter[5] =
+{
+   STBI__F_none,
+   STBI__F_sub,
+   STBI__F_none,
+   STBI__F_avg_first,
+   STBI__F_paeth_first
+};
+
+static int stbi__paeth(int a, int b, int c)
+{
+   int p = a + b - c;
+   int pa = abs(p-a);
+   int pb = abs(p-b);
+   int pc = abs(p-c);
+   if (pa <= pb && pa <= pc) return a;
+   if (pb <= pc) return b;
+   return c;
+}
+
+static stbi_uc stbi__depth_scale_table[9] = { 0, 0xff, 0x55, 0, 0x11, 0,0,0, 0x01 };
+
+// create the png data from post-deflated data
+static int stbi__create_png_image_raw(stbi__png *a, stbi_uc *raw, stbi__uint32 raw_len, int out_n, stbi__uint32 x, stbi__uint32 y, int depth, int color)
+{
+   stbi__context *s = a->s;
+   stbi__uint32 i,j,stride = x*out_n;
+   stbi__uint32 img_len, img_width_bytes;
+   int k;
+   int img_n = s->img_n; // copy it into a local for later
+
+   STBI_ASSERT(out_n == s->img_n || out_n == s->img_n+1);
+   a->out = (stbi_uc *) stbi__malloc(x * y * out_n); // extra bytes to write off the end into
+   if (!a->out) return stbi__err("outofmem", "Out of memory");
+
+   img_width_bytes = (((img_n * x * depth) + 7) >> 3);
+   img_len = (img_width_bytes + 1) * y;
+   if (s->img_x == x && s->img_y == y) {
+      if (raw_len != img_len) return stbi__err("not enough pixels","Corrupt PNG");
+   } else { // interlaced:
+      if (raw_len < img_len) return stbi__err("not enough pixels","Corrupt PNG");
+   }
+
+   for (j=0; j < y; ++j) {
+      stbi_uc *cur = a->out + stride*j;
+      stbi_uc *prior = cur - stride;
+      int filter = *raw++;
+      int filter_bytes = img_n;
+      int width = x;
+      if (filter > 4)
+         return stbi__err("invalid filter","Corrupt PNG");
+
+      if (depth < 8) {
+         STBI_ASSERT(img_width_bytes <= x);
+         cur += x*out_n - img_width_bytes; // store output to the rightmost img_len bytes, so we can decode in place
+         filter_bytes = 1;
+         width = img_width_bytes;
+      }
+
+      // if first row, use special filter that doesn't sample previous row
+      if (j == 0) filter = first_row_filter[filter];
+
+      // handle first byte explicitly
+      for (k=0; k < filter_bytes; ++k) {
+         switch (filter) {
+            case STBI__F_none       : cur[k] = raw[k]; break;
+            case STBI__F_sub        : cur[k] = raw[k]; break;
+            case STBI__F_up         : cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break;
+            case STBI__F_avg        : cur[k] = STBI__BYTECAST(raw[k] + (prior[k]>>1)); break;
+            case STBI__F_paeth      : cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(0,prior[k],0)); break;
+            case STBI__F_avg_first  : cur[k] = raw[k]; break;
+            case STBI__F_paeth_first: cur[k] = raw[k]; break;
+         }
+      }
+
+      if (depth == 8) {
+         if (img_n != out_n)
+            cur[img_n] = 255; // first pixel
+         raw += img_n;
+         cur += out_n;
+         prior += out_n;
+      } else {
+         raw += 1;
+         cur += 1;
+         prior += 1;
+      }
+
+      // this is a little gross, so that we don't switch per-pixel or per-component
+      if (depth < 8 || img_n == out_n) {
+         int nk = (width - 1)*img_n;
+         #define CASE(f) \
+             case f:     \
+                for (k=0; k < nk; ++k)
+         switch (filter) {
+            // "none" filter turns into a memcpy here; make that explicit.
+            case STBI__F_none:         memcpy(cur, raw, nk); break;
+            CASE(STBI__F_sub)          cur[k] = STBI__BYTECAST(raw[k] + cur[k-filter_bytes]); break;
+            CASE(STBI__F_up)           cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break;
+            CASE(STBI__F_avg)          cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-filter_bytes])>>1)); break;
+            CASE(STBI__F_paeth)        cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],prior[k],prior[k-filter_bytes])); break;
+            CASE(STBI__F_avg_first)    cur[k] = STBI__BYTECAST(raw[k] + (cur[k-filter_bytes] >> 1)); break;
+            CASE(STBI__F_paeth_first)  cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-filter_bytes],0,0)); break;
+         }
+         #undef CASE
+         raw += nk;
+      } else {
+         STBI_ASSERT(img_n+1 == out_n);
+         #define CASE(f) \
+             case f:     \
+                for (i=x-1; i >= 1; --i, cur[img_n]=255,raw+=img_n,cur+=out_n,prior+=out_n) \
+                   for (k=0; k < img_n; ++k)
+         switch (filter) {
+            CASE(STBI__F_none)         cur[k] = raw[k]; break;
+            CASE(STBI__F_sub)          cur[k] = STBI__BYTECAST(raw[k] + cur[k-out_n]); break;
+            CASE(STBI__F_up)           cur[k] = STBI__BYTECAST(raw[k] + prior[k]); break;
+            CASE(STBI__F_avg)          cur[k] = STBI__BYTECAST(raw[k] + ((prior[k] + cur[k-out_n])>>1)); break;
+            CASE(STBI__F_paeth)        cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-out_n],prior[k],prior[k-out_n])); break;
+            CASE(STBI__F_avg_first)    cur[k] = STBI__BYTECAST(raw[k] + (cur[k-out_n] >> 1)); break;
+            CASE(STBI__F_paeth_first)  cur[k] = STBI__BYTECAST(raw[k] + stbi__paeth(cur[k-out_n],0,0)); break;
+         }
+         #undef CASE
+      }
+   }
+
+   // we make a separate pass to expand bits to pixels; for performance,
+   // this could run two scanlines behind the above code, so it won't
+   // intefere with filtering but will still be in the cache.
+   if (depth < 8) {
+      for (j=0; j < y; ++j) {
+         stbi_uc *cur = a->out + stride*j;
+         stbi_uc *in  = a->out + stride*j + x*out_n - img_width_bytes;
+         // unpack 1/2/4-bit into a 8-bit buffer. allows us to keep the common 8-bit path optimal at minimal cost for 1/2/4-bit
+         // png guarante byte alignment, if width is not multiple of 8/4/2 we'll decode dummy trailing data that will be skipped in the later loop
+         stbi_uc scale = (color == 0) ? stbi__depth_scale_table[depth] : 1; // scale grayscale values to 0..255 range
+
+         // note that the final byte might overshoot and write more data than desired.
+         // we can allocate enough data that this never writes out of memory, but it
+         // could also overwrite the next scanline. can it overwrite non-empty data
+         // on the next scanline? yes, consider 1-pixel-wide scanlines with 1-bit-per-pixel.
+         // so we need to explicitly clamp the final ones
+
+         if (depth == 4) {
+            for (k=x*img_n; k >= 2; k-=2, ++in) {
+               *cur++ = scale * ((*in >> 4)       );
+               *cur++ = scale * ((*in     ) & 0x0f);
+            }
+            if (k > 0) *cur++ = scale * ((*in >> 4)       );
+         } else if (depth == 2) {
+            for (k=x*img_n; k >= 4; k-=4, ++in) {
+               *cur++ = scale * ((*in >> 6)       );
+               *cur++ = scale * ((*in >> 4) & 0x03);
+               *cur++ = scale * ((*in >> 2) & 0x03);
+               *cur++ = scale * ((*in     ) & 0x03);
+            }
+            if (k > 0) *cur++ = scale * ((*in >> 6)       );
+            if (k > 1) *cur++ = scale * ((*in >> 4) & 0x03);
+            if (k > 2) *cur++ = scale * ((*in >> 2) & 0x03);
+         } else if (depth == 1) {
+            for (k=x*img_n; k >= 8; k-=8, ++in) {
+               *cur++ = scale * ((*in >> 7)       );
+               *cur++ = scale * ((*in >> 6) & 0x01);
+               *cur++ = scale * ((*in >> 5) & 0x01);
+               *cur++ = scale * ((*in >> 4) & 0x01);
+               *cur++ = scale * ((*in >> 3) & 0x01);
+               *cur++ = scale * ((*in >> 2) & 0x01);
+               *cur++ = scale * ((*in >> 1) & 0x01);
+               *cur++ = scale * ((*in     ) & 0x01);
+            }
+            if (k > 0) *cur++ = scale * ((*in >> 7)       );
+            if (k > 1) *cur++ = scale * ((*in >> 6) & 0x01);
+            if (k > 2) *cur++ = scale * ((*in >> 5) & 0x01);
+            if (k > 3) *cur++ = scale * ((*in >> 4) & 0x01);
+            if (k > 4) *cur++ = scale * ((*in >> 3) & 0x01);
+            if (k > 5) *cur++ = scale * ((*in >> 2) & 0x01);
+            if (k > 6) *cur++ = scale * ((*in >> 1) & 0x01);
+         }
+         if (img_n != out_n) {
+            int q;
+            // insert alpha = 255
+            cur = a->out + stride*j;
+            if (img_n == 1) {
+               for (q=x-1; q >= 0; --q) {
+                  cur[q*2+1] = 255;
+                  cur[q*2+0] = cur[q];
+               }
+            } else {
+               STBI_ASSERT(img_n == 3);
+               for (q=x-1; q >= 0; --q) {
+                  cur[q*4+3] = 255;
+                  cur[q*4+2] = cur[q*3+2];
+                  cur[q*4+1] = cur[q*3+1];
+                  cur[q*4+0] = cur[q*3+0];
+               }
+            }
+         }
+      }
+   }
+
+   return 1;
+}
+
+static int stbi__create_png_image(stbi__png *a, stbi_uc *image_data, stbi__uint32 image_data_len, int out_n, int depth, int color, int interlaced)
+{
+   stbi_uc *final;
+   int p;
+   if (!interlaced)
+      return stbi__create_png_image_raw(a, image_data, image_data_len, out_n, a->s->img_x, a->s->img_y, depth, color);
+
+   // de-interlacing
+   final = (stbi_uc *) stbi__malloc(a->s->img_x * a->s->img_y * out_n);
+   for (p=0; p < 7; ++p) {
+      int xorig[] = { 0,4,0,2,0,1,0 };
+      int yorig[] = { 0,0,4,0,2,0,1 };
+      int xspc[]  = { 8,8,4,4,2,2,1 };
+      int yspc[]  = { 8,8,8,4,4,2,2 };
+      int i,j,x,y;
+      // pass1_x[4] = 0, pass1_x[5] = 1, pass1_x[12] = 1
+      x = (a->s->img_x - xorig[p] + xspc[p]-1) / xspc[p];
+      y = (a->s->img_y - yorig[p] + yspc[p]-1) / yspc[p];
+      if (x && y) {
+         stbi__uint32 img_len = ((((a->s->img_n * x * depth) + 7) >> 3) + 1) * y;
+         if (!stbi__create_png_image_raw(a, image_data, image_data_len, out_n, x, y, depth, color)) {
+            STBI_FREE(final);
+            return 0;
+         }
+         for (j=0; j < y; ++j) {
+            for (i=0; i < x; ++i) {
+               int out_y = j*yspc[p]+yorig[p];
+               int out_x = i*xspc[p]+xorig[p];
+               memcpy(final + out_y*a->s->img_x*out_n + out_x*out_n,
+                      a->out + (j*x+i)*out_n, out_n);
+            }
+         }
+         STBI_FREE(a->out);
+         image_data += img_len;
+         image_data_len -= img_len;
+      }
+   }
+   a->out = final;
+
+   return 1;
+}
+
+static int stbi__compute_transparency(stbi__png *z, stbi_uc tc[3], int out_n)
+{
+   stbi__context *s = z->s;
+   stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+   stbi_uc *p = z->out;
+
+   // compute color-based transparency, assuming we've
+   // already got 255 as the alpha value in the output
+   STBI_ASSERT(out_n == 2 || out_n == 4);
+
+   if (out_n == 2) {
+      for (i=0; i < pixel_count; ++i) {
+         p[1] = (p[0] == tc[0] ? 0 : 255);
+         p += 2;
+      }
+   } else {
+      for (i=0; i < pixel_count; ++i) {
+         if (p[0] == tc[0] && p[1] == tc[1] && p[2] == tc[2])
+            p[3] = 0;
+         p += 4;
+      }
+   }
+   return 1;
+}
+
+static int stbi__expand_png_palette(stbi__png *a, stbi_uc *palette, int len, int pal_img_n)
+{
+   stbi__uint32 i, pixel_count = a->s->img_x * a->s->img_y;
+   stbi_uc *p, *temp_out, *orig = a->out;
+
+   p = (stbi_uc *) stbi__malloc(pixel_count * pal_img_n);
+   if (p == NULL) return stbi__err("outofmem", "Out of memory");
+
+   // between here and free(out) below, exitting would leak
+   temp_out = p;
+
+   if (pal_img_n == 3) {
+      for (i=0; i < pixel_count; ++i) {
+         int n = orig[i]*4;
+         p[0] = palette[n  ];
+         p[1] = palette[n+1];
+         p[2] = palette[n+2];
+         p += 3;
+      }
+   } else {
+      for (i=0; i < pixel_count; ++i) {
+         int n = orig[i]*4;
+         p[0] = palette[n  ];
+         p[1] = palette[n+1];
+         p[2] = palette[n+2];
+         p[3] = palette[n+3];
+         p += 4;
+      }
+   }
+   STBI_FREE(a->out);
+   a->out = temp_out;
+
+   STBI_NOTUSED(len);
+
+   return 1;
+}
+
+static int stbi__unpremultiply_on_load = 0;
+static int stbi__de_iphone_flag = 0;
+
+STBIDEF void stbi_set_unpremultiply_on_load(int flag_true_if_should_unpremultiply)
+{
+   stbi__unpremultiply_on_load = flag_true_if_should_unpremultiply;
+}
+
+STBIDEF void stbi_convert_iphone_png_to_rgb(int flag_true_if_should_convert)
+{
+   stbi__de_iphone_flag = flag_true_if_should_convert;
+}
+
+static void stbi__de_iphone(stbi__png *z)
+{
+   stbi__context *s = z->s;
+   stbi__uint32 i, pixel_count = s->img_x * s->img_y;
+   stbi_uc *p = z->out;
+
+   if (s->img_out_n == 3) {  // convert bgr to rgb
+      for (i=0; i < pixel_count; ++i) {
+         stbi_uc t = p[0];
+         p[0] = p[2];
+         p[2] = t;
+         p += 3;
+      }
+   } else {
+      STBI_ASSERT(s->img_out_n == 4);
+      if (stbi__unpremultiply_on_load) {
+         // convert bgr to rgb and unpremultiply
+         for (i=0; i < pixel_count; ++i) {
+            stbi_uc a = p[3];
+            stbi_uc t = p[0];
+            if (a) {
+               p[0] = p[2] * 255 / a;
+               p[1] = p[1] * 255 / a;
+               p[2] =  t   * 255 / a;
+            } else {
+               p[0] = p[2];
+               p[2] = t;
+            }
+            p += 4;
+         }
+      } else {
+         // convert bgr to rgb
+         for (i=0; i < pixel_count; ++i) {
+            stbi_uc t = p[0];
+            p[0] = p[2];
+            p[2] = t;
+            p += 4;
+         }
+      }
+   }
+}
+
+#define STBI__PNG_TYPE(a,b,c,d)  (((a) << 24) + ((b) << 16) + ((c) << 8) + (d))
+
+static int stbi__parse_png_file(stbi__png *z, int scan, int req_comp)
+{
+   stbi_uc palette[1024], pal_img_n=0;
+   stbi_uc has_trans=0, tc[3];
+   stbi__uint32 ioff=0, idata_limit=0, i, pal_len=0;
+   int first=1,k,interlace=0, color=0, depth=0, is_iphone=0;
+   stbi__context *s = z->s;
+
+   z->expanded = NULL;
+   z->idata = NULL;
+   z->out = NULL;
+
+   if (!stbi__check_png_header(s)) return 0;
+
+   if (scan == STBI__SCAN_type) return 1;
+
+   for (;;) {
+      stbi__pngchunk c = stbi__get_chunk_header(s);
+      switch (c.type) {
+         case STBI__PNG_TYPE('C','g','B','I'):
+            is_iphone = 1;
+            stbi__skip(s, c.length);
+            break;
+         case STBI__PNG_TYPE('I','H','D','R'): {
+            int comp,filter;
+            if (!first) return stbi__err("multiple IHDR","Corrupt PNG");
+            first = 0;
+            if (c.length != 13) return stbi__err("bad IHDR len","Corrupt PNG");
+            s->img_x = stbi__get32be(s); if (s->img_x > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
+            s->img_y = stbi__get32be(s); if (s->img_y > (1 << 24)) return stbi__err("too large","Very large image (corrupt?)");
+            depth = stbi__get8(s);  if (depth != 1 && depth != 2 && depth != 4 && depth != 8)  return stbi__err("1/2/4/8-bit only","PNG not supported: 1/2/4/8-bit only");
+            color = stbi__get8(s);  if (color > 6)         return stbi__err("bad ctype","Corrupt PNG");
+            if (color == 3) pal_img_n = 3; else if (color & 1) return stbi__err("bad ctype","Corrupt PNG");
+            comp  = stbi__get8(s);  if (comp) return stbi__err("bad comp method","Corrupt PNG");
+            filter= stbi__get8(s);  if (filter) return stbi__err("bad filter method","Corrupt PNG");
+            interlace = stbi__get8(s); if (interlace>1) return stbi__err("bad interlace method","Corrupt PNG");
+            if (!s->img_x || !s->img_y) return stbi__err("0-pixel image","Corrupt PNG");
+            if (!pal_img_n) {
+               s->img_n = (color & 2 ? 3 : 1) + (color & 4 ? 1 : 0);
+               if ((1 << 30) / s->img_x / s->img_n < s->img_y) return stbi__err("too large", "Image too large to decode");
+               if (scan == STBI__SCAN_header) return 1;
+            } else {
+               // if paletted, then pal_n is our final components, and
+               // img_n is # components to decompress/filter.
+               s->img_n = 1;
+               if ((1 << 30) / s->img_x / 4 < s->img_y) return stbi__err("too large","Corrupt PNG");
+               // if SCAN_header, have to scan to see if we have a tRNS
+            }
+            break;
+         }
+
+         case STBI__PNG_TYPE('P','L','T','E'):  {
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (c.length > 256*3) return stbi__err("invalid PLTE","Corrupt PNG");
+            pal_len = c.length / 3;
+            if (pal_len * 3 != c.length) return stbi__err("invalid PLTE","Corrupt PNG");
+            for (i=0; i < pal_len; ++i) {
+               palette[i*4+0] = stbi__get8(s);
+               palette[i*4+1] = stbi__get8(s);
+               palette[i*4+2] = stbi__get8(s);
+               palette[i*4+3] = 255;
+            }
+            break;
+         }
+
+         case STBI__PNG_TYPE('t','R','N','S'): {
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (z->idata) return stbi__err("tRNS after IDAT","Corrupt PNG");
+            if (pal_img_n) {
+               if (scan == STBI__SCAN_header) { s->img_n = 4; return 1; }
+               if (pal_len == 0) return stbi__err("tRNS before PLTE","Corrupt PNG");
+               if (c.length > pal_len) return stbi__err("bad tRNS len","Corrupt PNG");
+               pal_img_n = 4;
+               for (i=0; i < c.length; ++i)
+                  palette[i*4+3] = stbi__get8(s);
+            } else {
+               if (!(s->img_n & 1)) return stbi__err("tRNS with alpha","Corrupt PNG");
+               if (c.length != (stbi__uint32) s->img_n*2) return stbi__err("bad tRNS len","Corrupt PNG");
+               has_trans = 1;
+               for (k=0; k < s->img_n; ++k)
+                  tc[k] = (stbi_uc) (stbi__get16be(s) & 255) * stbi__depth_scale_table[depth]; // non 8-bit images will be larger
+            }
+            break;
+         }
+
+         case STBI__PNG_TYPE('I','D','A','T'): {
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (pal_img_n && !pal_len) return stbi__err("no PLTE","Corrupt PNG");
+            if (scan == STBI__SCAN_header) { s->img_n = pal_img_n; return 1; }
+            if ((int)(ioff + c.length) < (int)ioff) return 0;
+            if (ioff + c.length > idata_limit) {
+               stbi__uint32 idata_limit_old = idata_limit;
+               stbi_uc *p;
+               if (idata_limit == 0) idata_limit = c.length > 4096 ? c.length : 4096;
+               while (ioff + c.length > idata_limit)
+                  idata_limit *= 2;
+               STBI_NOTUSED(idata_limit_old);
+               p = (stbi_uc *) STBI_REALLOC_SIZED(z->idata, idata_limit_old, idata_limit); if (p == NULL) return stbi__err("outofmem", "Out of memory");
+               z->idata = p;
+            }
+            if (!stbi__getn(s, z->idata+ioff,c.length)) return stbi__err("outofdata","Corrupt PNG");
+            ioff += c.length;
+            break;
+         }
+
+         case STBI__PNG_TYPE('I','E','N','D'): {
+            stbi__uint32 raw_len, bpl;
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if (scan != STBI__SCAN_load) return 1;
+            if (z->idata == NULL) return stbi__err("no IDAT","Corrupt PNG");
+            // initial guess for decoded data size to avoid unnecessary reallocs
+            bpl = (s->img_x * depth + 7) / 8; // bytes per line, per component
+            raw_len = bpl * s->img_y * s->img_n /* pixels */ + s->img_y /* filter mode per row */;
+            z->expanded = (stbi_uc *) stbi_zlib_decode_malloc_guesssize_headerflag((char *) z->idata, ioff, raw_len, (int *) &raw_len, !is_iphone);
+            if (z->expanded == NULL) return 0; // zlib should set error
+            STBI_FREE(z->idata); z->idata = NULL;
+            if ((req_comp == s->img_n+1 && req_comp != 3 && !pal_img_n) || has_trans)
+               s->img_out_n = s->img_n+1;
+            else
+               s->img_out_n = s->img_n;
+            if (!stbi__create_png_image(z, z->expanded, raw_len, s->img_out_n, depth, color, interlace)) return 0;
+            if (has_trans)
+               if (!stbi__compute_transparency(z, tc, s->img_out_n)) return 0;
+            if (is_iphone && stbi__de_iphone_flag && s->img_out_n > 2)
+               stbi__de_iphone(z);
+            if (pal_img_n) {
+               // pal_img_n == 3 or 4
+               s->img_n = pal_img_n; // record the actual colors we had
+               s->img_out_n = pal_img_n;
+               if (req_comp >= 3) s->img_out_n = req_comp;
+               if (!stbi__expand_png_palette(z, palette, pal_len, s->img_out_n))
+                  return 0;
+            }
+            STBI_FREE(z->expanded); z->expanded = NULL;
+            return 1;
+         }
+
+         default:
+            // if critical, fail
+            if (first) return stbi__err("first not IHDR", "Corrupt PNG");
+            if ((c.type & (1 << 29)) == 0) {
+               #ifndef STBI_NO_FAILURE_STRINGS
+               // not threadsafe
+               static char invalid_chunk[] = "XXXX PNG chunk not known";
+               invalid_chunk[0] = STBI__BYTECAST(c.type >> 24);
+               invalid_chunk[1] = STBI__BYTECAST(c.type >> 16);
+               invalid_chunk[2] = STBI__BYTECAST(c.type >>  8);
+               invalid_chunk[3] = STBI__BYTECAST(c.type >>  0);
+               #endif
+               return stbi__err(invalid_chunk, "PNG not supported: unknown PNG chunk type");
+            }
+            stbi__skip(s, c.length);
+            break;
+      }
+      // end of PNG chunk, read and skip CRC
+      stbi__get32be(s);
+   }
+}
+
+static unsigned char *stbi__do_png(stbi__png *p, int *x, int *y, int *n, int req_comp)
+{
+   unsigned char *result=NULL;
+   if (req_comp < 0 || req_comp > 4) return stbi__errpuc("bad req_comp", "Internal error");
+   if (stbi__parse_png_file(p, STBI__SCAN_load, req_comp)) {
+      result = p->out;
+      p->out = NULL;
+      if (req_comp && req_comp != p->s->img_out_n) {
+         result = stbi__convert_format(result, p->s->img_out_n, req_comp, p->s->img_x, p->s->img_y);
+         p->s->img_out_n = req_comp;
+         if (result == NULL) return result;
+      }
+      *x = p->s->img_x;
+      *y = p->s->img_y;
+      if (n) *n = p->s->img_out_n;
+   }
+   STBI_FREE(p->out);      p->out      = NULL;
+   STBI_FREE(p->expanded); p->expanded = NULL;
+   STBI_FREE(p->idata);    p->idata    = NULL;
+
+   return result;
+}
+
+static unsigned char *stbi__png_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   stbi__png p;
+   p.s = s;
+   return stbi__do_png(&p, x,y,comp,req_comp);
+}
+
+static int stbi__png_test(stbi__context *s)
+{
+   int r;
+   r = stbi__check_png_header(s);
+   stbi__rewind(s);
+   return r;
+}
+
+static int stbi__png_info_raw(stbi__png *p, int *x, int *y, int *comp)
+{
+   if (!stbi__parse_png_file(p, STBI__SCAN_header, 0)) {
+      stbi__rewind( p->s );
+      return 0;
+   }
+   if (x) *x = p->s->img_x;
+   if (y) *y = p->s->img_y;
+   if (comp) *comp = p->s->img_n;
+   return 1;
+}
+
+static int stbi__png_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   stbi__png p;
+   p.s = s;
+   return stbi__png_info_raw(&p, x, y, comp);
+}
+#endif
+
+// Microsoft/Windows BMP image
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_test_raw(stbi__context *s)
+{
+   int r;
+   int sz;
+   if (stbi__get8(s) != 'B') return 0;
+   if (stbi__get8(s) != 'M') return 0;
+   stbi__get32le(s); // discard filesize
+   stbi__get16le(s); // discard reserved
+   stbi__get16le(s); // discard reserved
+   stbi__get32le(s); // discard data offset
+   sz = stbi__get32le(s);
+   r = (sz == 12 || sz == 40 || sz == 56 || sz == 108 || sz == 124);
+   return r;
+}
+
+static int stbi__bmp_test(stbi__context *s)
+{
+   int r = stbi__bmp_test_raw(s);
+   stbi__rewind(s);
+   return r;
+}
+
+
+// returns 0..31 for the highest set bit
+static int stbi__high_bit(unsigned int z)
+{
+   int n=0;
+   if (z == 0) return -1;
+   if (z >= 0x10000) n += 16, z >>= 16;
+   if (z >= 0x00100) n +=  8, z >>=  8;
+   if (z >= 0x00010) n +=  4, z >>=  4;
+   if (z >= 0x00004) n +=  2, z >>=  2;
+   if (z >= 0x00002) n +=  1, z >>=  1;
+   return n;
+}
+
+static int stbi__bitcount(unsigned int a)
+{
+   a = (a & 0x55555555) + ((a >>  1) & 0x55555555); // max 2
+   a = (a & 0x33333333) + ((a >>  2) & 0x33333333); // max 4
+   a = (a + (a >> 4)) & 0x0f0f0f0f; // max 8 per 4, now 8 bits
+   a = (a + (a >> 8)); // max 16 per 8 bits
+   a = (a + (a >> 16)); // max 32 per 8 bits
+   return a & 0xff;
+}
+
+static int stbi__shiftsigned(int v, int shift, int bits)
+{
+   int result;
+   int z=0;
+
+   if (shift < 0) v <<= -shift;
+   else v >>= shift;
+   result = v;
+
+   z = bits;
+   while (z < 8) {
+      result += v >> z;
+      z += bits;
+   }
+   return result;
+}
+
+typedef struct
+{
+   int bpp, offset, hsz;
+   unsigned int mr,mg,mb,ma, all_a;
+} stbi__bmp_data;
+
+static void *stbi__bmp_parse_header(stbi__context *s, stbi__bmp_data *info)
+{
+   int hsz;
+   if (stbi__get8(s) != 'B' || stbi__get8(s) != 'M') return stbi__errpuc("not BMP", "Corrupt BMP");
+   stbi__get32le(s); // discard filesize
+   stbi__get16le(s); // discard reserved
+   stbi__get16le(s); // discard reserved
+   info->offset = stbi__get32le(s);
+   info->hsz = hsz = stbi__get32le(s);
+   
+   if (hsz != 12 && hsz != 40 && hsz != 56 && hsz != 108 && hsz != 124) return stbi__errpuc("unknown BMP", "BMP type not supported: unknown");
+   if (hsz == 12) {
+      s->img_x = stbi__get16le(s);
+      s->img_y = stbi__get16le(s);
+   } else {
+      s->img_x = stbi__get32le(s);
+      s->img_y = stbi__get32le(s);
+   }
+   if (stbi__get16le(s) != 1) return stbi__errpuc("bad BMP", "bad BMP");
+   info->bpp = stbi__get16le(s);
+   if (info->bpp == 1) return stbi__errpuc("monochrome", "BMP type not supported: 1-bit");
+   if (hsz != 12) {
+      int compress = stbi__get32le(s);
+      if (compress == 1 || compress == 2) return stbi__errpuc("BMP RLE", "BMP type not supported: RLE");
+      stbi__get32le(s); // discard sizeof
+      stbi__get32le(s); // discard hres
+      stbi__get32le(s); // discard vres
+      stbi__get32le(s); // discard colorsused
+      stbi__get32le(s); // discard max important
+      if (hsz == 40 || hsz == 56) {
+         if (hsz == 56) {
+            stbi__get32le(s);
+            stbi__get32le(s);
+            stbi__get32le(s);
+            stbi__get32le(s);
+         }
+         if (info->bpp == 16 || info->bpp == 32) {
+            info->mr = info->mg = info->mb = 0;
+            if (compress == 0) {
+               if (info->bpp == 32) {
+                  info->mr = 0xffu << 16;
+                  info->mg = 0xffu <<  8;
+                  info->mb = 0xffu <<  0;
+                  info->ma = 0xffu << 24;
+                  info->all_a = 0; // if all_a is 0 at end, then we loaded alpha channel but it was all 0
+               } else {
+                  info->mr = 31u << 10;
+                  info->mg = 31u <<  5;
+                  info->mb = 31u <<  0;
+               }
+            } else if (compress == 3) {
+               info->mr = stbi__get32le(s);
+               info->mg = stbi__get32le(s);
+               info->mb = stbi__get32le(s);
+               // not documented, but generated by photoshop and handled by mspaint
+               if (info->mr == info->mg && info->mg == info->mb) {
+                  // ?!?!?
+                  return stbi__errpuc("bad BMP", "bad BMP");
+               }
+            } else
+               return stbi__errpuc("bad BMP", "bad BMP");
+         }
+      } else {
+         int i;
+         if (hsz != 108 && hsz != 124)
+            return stbi__errpuc("bad BMP", "bad BMP");
+         info->mr = stbi__get32le(s);
+         info->mg = stbi__get32le(s);
+         info->mb = stbi__get32le(s);
+         info->ma = stbi__get32le(s);
+         stbi__get32le(s); // discard color space
+         for (i=0; i < 12; ++i)
+            stbi__get32le(s); // discard color space parameters
+         if (hsz == 124) {
+            stbi__get32le(s); // discard rendering intent
+            stbi__get32le(s); // discard offset of profile data
+            stbi__get32le(s); // discard size of profile data
+            stbi__get32le(s); // discard reserved
+         }
+      }
+   }
+   return (void *) 1;
+}
+
+
+static stbi_uc *stbi__bmp_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   stbi_uc *out;
+   unsigned int mr=0,mg=0,mb=0,ma=0, all_a;
+   stbi_uc pal[256][4];
+   int psize=0,i,j,width;
+   int flip_vertically, pad, target;
+   stbi__bmp_data info;
+
+   info.all_a = 255;   
+   if (stbi__bmp_parse_header(s, &info) == NULL)
+      return NULL; // error code already set
+
+   flip_vertically = ((int) s->img_y) > 0;
+   s->img_y = abs((int) s->img_y);
+
+   mr = info.mr;
+   mg = info.mg;
+   mb = info.mb;
+   ma = info.ma;
+   all_a = info.all_a;
+
+   if (info.hsz == 12) {
+      if (info.bpp < 24)
+         psize = (info.offset - 14 - 24) / 3;
+   } else {
+      if (info.bpp < 16)
+         psize = (info.offset - 14 - info.hsz) >> 2;
+   }
+
+   s->img_n = ma ? 4 : 3;
+   if (req_comp && req_comp >= 3) // we can directly decode 3 or 4
+      target = req_comp;
+   else
+      target = s->img_n; // if they want monochrome, we'll post-convert
+
+   out = (stbi_uc *) stbi__malloc(target * s->img_x * s->img_y);
+   if (!out) return stbi__errpuc("outofmem", "Out of memory");
+   if (info.bpp < 16) {
+      int z=0;
+      if (psize == 0 || psize > 256) { STBI_FREE(out); return stbi__errpuc("invalid", "Corrupt BMP"); }
+      for (i=0; i < psize; ++i) {
+         pal[i][2] = stbi__get8(s);
+         pal[i][1] = stbi__get8(s);
+         pal[i][0] = stbi__get8(s);
+         if (info.hsz != 12) stbi__get8(s);
+         pal[i][3] = 255;
+      }
+      stbi__skip(s, info.offset - 14 - info.hsz - psize * (info.hsz == 12 ? 3 : 4));
+      if (info.bpp == 4) width = (s->img_x + 1) >> 1;
+      else if (info.bpp == 8) width = s->img_x;
+      else { STBI_FREE(out); return stbi__errpuc("bad bpp", "Corrupt BMP"); }
+      pad = (-width)&3;
+      for (j=0; j < (int) s->img_y; ++j) {
+         for (i=0; i < (int) s->img_x; i += 2) {
+            int v=stbi__get8(s),v2=0;
+            if (info.bpp == 4) {
+               v2 = v & 15;
+               v >>= 4;
+            }
+            out[z++] = pal[v][0];
+            out[z++] = pal[v][1];
+            out[z++] = pal[v][2];
+            if (target == 4) out[z++] = 255;
+            if (i+1 == (int) s->img_x) break;
+            v = (info.bpp == 8) ? stbi__get8(s) : v2;
+            out[z++] = pal[v][0];
+            out[z++] = pal[v][1];
+            out[z++] = pal[v][2];
+            if (target == 4) out[z++] = 255;
+         }
+         stbi__skip(s, pad);
+      }
+   } else {
+      int rshift=0,gshift=0,bshift=0,ashift=0,rcount=0,gcount=0,bcount=0,acount=0;
+      int z = 0;
+      int easy=0;
+      stbi__skip(s, info.offset - 14 - info.hsz);
+      if (info.bpp == 24) width = 3 * s->img_x;
+      else if (info.bpp == 16) width = 2*s->img_x;
+      else /* bpp = 32 and pad = 0 */ width=0;
+      pad = (-width) & 3;
+      if (info.bpp == 24) {
+         easy = 1;
+      } else if (info.bpp == 32) {
+         if (mb == 0xff && mg == 0xff00 && mr == 0x00ff0000 && ma == 0xff000000)
+            easy = 2;
+      }
+      if (!easy) {
+         if (!mr || !mg || !mb) { STBI_FREE(out); return stbi__errpuc("bad masks", "Corrupt BMP"); }
+         // right shift amt to put high bit in position #7
+         rshift = stbi__high_bit(mr)-7; rcount = stbi__bitcount(mr);
+         gshift = stbi__high_bit(mg)-7; gcount = stbi__bitcount(mg);
+         bshift = stbi__high_bit(mb)-7; bcount = stbi__bitcount(mb);
+         ashift = stbi__high_bit(ma)-7; acount = stbi__bitcount(ma);
+      }
+      for (j=0; j < (int) s->img_y; ++j) {
+         if (easy) {
+            for (i=0; i < (int) s->img_x; ++i) {
+               unsigned char a;
+               out[z+2] = stbi__get8(s);
+               out[z+1] = stbi__get8(s);
+               out[z+0] = stbi__get8(s);
+               z += 3;
+               a = (easy == 2 ? stbi__get8(s) : 255);
+               all_a |= a;
+               if (target == 4) out[z++] = a;
+            }
+         } else {
+            int bpp = info.bpp;
+            for (i=0; i < (int) s->img_x; ++i) {
+               stbi__uint32 v = (bpp == 16 ? (stbi__uint32) stbi__get16le(s) : stbi__get32le(s));
+               int a;
+               out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mr, rshift, rcount));
+               out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mg, gshift, gcount));
+               out[z++] = STBI__BYTECAST(stbi__shiftsigned(v & mb, bshift, bcount));
+               a = (ma ? stbi__shiftsigned(v & ma, ashift, acount) : 255);
+               all_a |= a;
+               if (target == 4) out[z++] = STBI__BYTECAST(a);
+            }
+         }
+         stbi__skip(s, pad);
+      }
+   }
+   
+   // if alpha channel is all 0s, replace with all 255s
+   if (target == 4 && all_a == 0)
+      for (i=4*s->img_x*s->img_y-1; i >= 0; i -= 4)
+         out[i] = 255;
+
+   if (flip_vertically) {
+      stbi_uc t;
+      for (j=0; j < (int) s->img_y>>1; ++j) {
+         stbi_uc *p1 = out +      j     *s->img_x*target;
+         stbi_uc *p2 = out + (s->img_y-1-j)*s->img_x*target;
+         for (i=0; i < (int) s->img_x*target; ++i) {
+            t = p1[i], p1[i] = p2[i], p2[i] = t;
+         }
+      }
+   }
+
+   if (req_comp && req_comp != target) {
+      out = stbi__convert_format(out, target, req_comp, s->img_x, s->img_y);
+      if (out == NULL) return out; // stbi__convert_format frees input on failure
+   }
+
+   *x = s->img_x;
+   *y = s->img_y;
+   if (comp) *comp = s->img_n;
+   return out;
+}
+#endif
+
+// Targa Truevision - TGA
+// by Jonathan Dummer
+#ifndef STBI_NO_TGA
+// returns STBI_rgb or whatever, 0 on error
+static int stbi__tga_get_comp(int bits_per_pixel, int is_grey, int* is_rgb16)
+{
+   // only RGB or RGBA (incl. 16bit) or grey allowed
+   if(is_rgb16) *is_rgb16 = 0;
+   switch(bits_per_pixel) {
+      case 8:  return STBI_grey;
+      case 16: if(is_grey) return STBI_grey_alpha;
+            // else: fall-through
+      case 15: if(is_rgb16) *is_rgb16 = 1;
+            return STBI_rgb;
+      case 24: // fall-through
+      case 32: return bits_per_pixel/8;
+      default: return 0;
+   }
+}
+
+static int stbi__tga_info(stbi__context *s, int *x, int *y, int *comp)
+{
+    int tga_w, tga_h, tga_comp, tga_image_type, tga_bits_per_pixel, tga_colormap_bpp;
+    int sz, tga_colormap_type;
+    stbi__get8(s);                   // discard Offset
+    tga_colormap_type = stbi__get8(s); // colormap type
+    if( tga_colormap_type > 1 ) {
+        stbi__rewind(s);
+        return 0;      // only RGB or indexed allowed
+    }
+    tga_image_type = stbi__get8(s); // image type
+    if ( tga_colormap_type == 1 ) { // colormapped (paletted) image
+        if (tga_image_type != 1 && tga_image_type != 9) {
+            stbi__rewind(s);
+            return 0;
+        }
+        stbi__skip(s,4);       // skip index of first colormap entry and number of entries
+        sz = stbi__get8(s);    //   check bits per palette color entry
+        if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) {
+            stbi__rewind(s);
+            return 0;
+        }
+        stbi__skip(s,4);       // skip image x and y origin
+        tga_colormap_bpp = sz;
+    } else { // "normal" image w/o colormap - only RGB or grey allowed, +/- RLE
+        if ( (tga_image_type != 2) && (tga_image_type != 3) && (tga_image_type != 10) && (tga_image_type != 11) ) {
+            stbi__rewind(s);
+            return 0; // only RGB or grey allowed, +/- RLE
+        }
+        stbi__skip(s,9); // skip colormap specification and image x/y origin
+        tga_colormap_bpp = 0;
+    }
+    tga_w = stbi__get16le(s);
+    if( tga_w < 1 ) {
+        stbi__rewind(s);
+        return 0;   // test width
+    }
+    tga_h = stbi__get16le(s);
+    if( tga_h < 1 ) {
+        stbi__rewind(s);
+        return 0;   // test height
+    }
+    tga_bits_per_pixel = stbi__get8(s); // bits per pixel
+    stbi__get8(s); // ignore alpha bits
+    if (tga_colormap_bpp != 0) {
+        if((tga_bits_per_pixel != 8) && (tga_bits_per_pixel != 16)) {
+            // when using a colormap, tga_bits_per_pixel is the size of the indexes
+            // I don't think anything but 8 or 16bit indexes makes sense
+            stbi__rewind(s);
+            return 0;
+        }
+        tga_comp = stbi__tga_get_comp(tga_colormap_bpp, 0, NULL);
+    } else {
+        tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3) || (tga_image_type == 11), NULL);
+    }
+    if(!tga_comp) {
+      stbi__rewind(s);
+      return 0;
+    }
+    if (x) *x = tga_w;
+    if (y) *y = tga_h;
+    if (comp) *comp = tga_comp;
+    return 1;                   // seems to have passed everything
+}
+
+static int stbi__tga_test(stbi__context *s)
+{
+   int res = 0;
+   int sz, tga_color_type;
+   stbi__get8(s);      //   discard Offset
+   tga_color_type = stbi__get8(s);   //   color type
+   if ( tga_color_type > 1 ) goto errorEnd;   //   only RGB or indexed allowed
+   sz = stbi__get8(s);   //   image type
+   if ( tga_color_type == 1 ) { // colormapped (paletted) image
+      if (sz != 1 && sz != 9) goto errorEnd; // colortype 1 demands image type 1 or 9
+      stbi__skip(s,4);       // skip index of first colormap entry and number of entries
+      sz = stbi__get8(s);    //   check bits per palette color entry
+      if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
+      stbi__skip(s,4);       // skip image x and y origin
+   } else { // "normal" image w/o colormap
+      if ( (sz != 2) && (sz != 3) && (sz != 10) && (sz != 11) ) goto errorEnd; // only RGB or grey allowed, +/- RLE
+      stbi__skip(s,9); // skip colormap specification and image x/y origin
+   }
+   if ( stbi__get16le(s) < 1 ) goto errorEnd;      //   test width
+   if ( stbi__get16le(s) < 1 ) goto errorEnd;      //   test height
+   sz = stbi__get8(s);   //   bits per pixel
+   if ( (tga_color_type == 1) && (sz != 8) && (sz != 16) ) goto errorEnd; // for colormapped images, bpp is size of an index
+   if ( (sz != 8) && (sz != 15) && (sz != 16) && (sz != 24) && (sz != 32) ) goto errorEnd;
+
+   res = 1; // if we got this far, everything's good and we can return 1 instead of 0
+
+errorEnd:
+   stbi__rewind(s);
+   return res;
+}
+
+// read 16bit value and convert to 24bit RGB
+void stbi__tga_read_rgb16(stbi__context *s, stbi_uc* out)
+{
+   stbi__uint16 px = stbi__get16le(s);
+   stbi__uint16 fiveBitMask = 31;
+   // we have 3 channels with 5bits each
+   int r = (px >> 10) & fiveBitMask;
+   int g = (px >> 5) & fiveBitMask;
+   int b = px & fiveBitMask;
+   // Note that this saves the data in RGB(A) order, so it doesn't need to be swapped later
+   out[0] = (r * 255)/31;
+   out[1] = (g * 255)/31;
+   out[2] = (b * 255)/31;
+
+   // some people claim that the most significant bit might be used for alpha
+   // (possibly if an alpha-bit is set in the "image descriptor byte")
+   // but that only made 16bit test images completely translucent..
+   // so let's treat all 15 and 16bit TGAs as RGB with no alpha.
+}
+
+static stbi_uc *stbi__tga_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   //   read in the TGA header stuff
+   int tga_offset = stbi__get8(s);
+   int tga_indexed = stbi__get8(s);
+   int tga_image_type = stbi__get8(s);
+   int tga_is_RLE = 0;
+   int tga_palette_start = stbi__get16le(s);
+   int tga_palette_len = stbi__get16le(s);
+   int tga_palette_bits = stbi__get8(s);
+   int tga_x_origin = stbi__get16le(s);
+   int tga_y_origin = stbi__get16le(s);
+   int tga_width = stbi__get16le(s);
+   int tga_height = stbi__get16le(s);
+   int tga_bits_per_pixel = stbi__get8(s);
+   int tga_comp, tga_rgb16=0;
+   int tga_inverted = stbi__get8(s);
+   // int tga_alpha_bits = tga_inverted & 15; // the 4 lowest bits - unused (useless?)
+   //   image data
+   unsigned char *tga_data;
+   unsigned char *tga_palette = NULL;
+   int i, j;
+   unsigned char raw_data[4];
+   int RLE_count = 0;
+   int RLE_repeating = 0;
+   int read_next_pixel = 1;
+
+   //   do a tiny bit of precessing
+   if ( tga_image_type >= 8 )
+   {
+      tga_image_type -= 8;
+      tga_is_RLE = 1;
+   }
+   tga_inverted = 1 - ((tga_inverted >> 5) & 1);
+
+   //   If I'm paletted, then I'll use the number of bits from the palette
+   if ( tga_indexed ) tga_comp = stbi__tga_get_comp(tga_palette_bits, 0, &tga_rgb16);
+   else tga_comp = stbi__tga_get_comp(tga_bits_per_pixel, (tga_image_type == 3), &tga_rgb16);
+
+   if(!tga_comp) // shouldn't really happen, stbi__tga_test() should have ensured basic consistency
+      return stbi__errpuc("bad format", "Can't find out TGA pixelformat");
+
+   //   tga info
+   *x = tga_width;
+   *y = tga_height;
+   if (comp) *comp = tga_comp;
+
+   tga_data = (unsigned char*)stbi__malloc( (size_t)tga_width * tga_height * tga_comp );
+   if (!tga_data) return stbi__errpuc("outofmem", "Out of memory");
+
+   // skip to the data's starting position (offset usually = 0)
+   stbi__skip(s, tga_offset );
+
+   if ( !tga_indexed && !tga_is_RLE && !tga_rgb16 ) {
+      for (i=0; i < tga_height; ++i) {
+         int row = tga_inverted ? tga_height -i - 1 : i;
+         stbi_uc *tga_row = tga_data + row*tga_width*tga_comp;
+         stbi__getn(s, tga_row, tga_width * tga_comp);
+      }
+   } else  {
+      //   do I need to load a palette?
+      if ( tga_indexed)
+      {
+         //   any data to skip? (offset usually = 0)
+         stbi__skip(s, tga_palette_start );
+         //   load the palette
+         tga_palette = (unsigned char*)stbi__malloc( tga_palette_len * tga_comp );
+         if (!tga_palette) {
+            STBI_FREE(tga_data);
+            return stbi__errpuc("outofmem", "Out of memory");
+         }
+         if (tga_rgb16) {
+            stbi_uc *pal_entry = tga_palette;
+            STBI_ASSERT(tga_comp == STBI_rgb);
+            for (i=0; i < tga_palette_len; ++i) {
+               stbi__tga_read_rgb16(s, pal_entry);
+               pal_entry += tga_comp;
+            }
+         } else if (!stbi__getn(s, tga_palette, tga_palette_len * tga_comp)) {
+               STBI_FREE(tga_data);
+               STBI_FREE(tga_palette);
+               return stbi__errpuc("bad palette", "Corrupt TGA");
+         }
+      }
+      //   load the data
+      for (i=0; i < tga_width * tga_height; ++i)
+      {
+         //   if I'm in RLE mode, do I need to get a RLE stbi__pngchunk?
+         if ( tga_is_RLE )
+         {
+            if ( RLE_count == 0 )
+            {
+               //   yep, get the next byte as a RLE command
+               int RLE_cmd = stbi__get8(s);
+               RLE_count = 1 + (RLE_cmd & 127);
+               RLE_repeating = RLE_cmd >> 7;
+               read_next_pixel = 1;
+            } else if ( !RLE_repeating )
+            {
+               read_next_pixel = 1;
+            }
+         } else
+         {
+            read_next_pixel = 1;
+         }
+         //   OK, if I need to read a pixel, do it now
+         if ( read_next_pixel )
+         {
+            //   load however much data we did have
+            if ( tga_indexed )
+            {
+               // read in index, then perform the lookup
+               int pal_idx = (tga_bits_per_pixel == 8) ? stbi__get8(s) : stbi__get16le(s);
+               if ( pal_idx >= tga_palette_len ) {
+                  // invalid index
+                  pal_idx = 0;
+               }
+               pal_idx *= tga_comp;
+               for (j = 0; j < tga_comp; ++j) {
+                  raw_data[j] = tga_palette[pal_idx+j];
+               }
+            } else if(tga_rgb16) {
+               STBI_ASSERT(tga_comp == STBI_rgb);
+               stbi__tga_read_rgb16(s, raw_data);
+            } else {
+               //   read in the data raw
+               for (j = 0; j < tga_comp; ++j) {
+                  raw_data[j] = stbi__get8(s);
+               }
+            }
+            //   clear the reading flag for the next pixel
+            read_next_pixel = 0;
+         } // end of reading a pixel
+
+         // copy data
+         for (j = 0; j < tga_comp; ++j)
+           tga_data[i*tga_comp+j] = raw_data[j];
+
+         //   in case we're in RLE mode, keep counting down
+         --RLE_count;
+      }
+      //   do I need to invert the image?
+      if ( tga_inverted )
+      {
+         for (j = 0; j*2 < tga_height; ++j)
+         {
+            int index1 = j * tga_width * tga_comp;
+            int index2 = (tga_height - 1 - j) * tga_width * tga_comp;
+            for (i = tga_width * tga_comp; i > 0; --i)
+            {
+               unsigned char temp = tga_data[index1];
+               tga_data[index1] = tga_data[index2];
+               tga_data[index2] = temp;
+               ++index1;
+               ++index2;
+            }
+         }
+      }
+      //   clear my palette, if I had one
+      if ( tga_palette != NULL )
+      {
+         STBI_FREE( tga_palette );
+      }
+   }
+
+   // swap RGB - if the source data was RGB16, it already is in the right order
+   if (tga_comp >= 3 && !tga_rgb16)
+   {
+      unsigned char* tga_pixel = tga_data;
+      for (i=0; i < tga_width * tga_height; ++i)
+      {
+         unsigned char temp = tga_pixel[0];
+         tga_pixel[0] = tga_pixel[2];
+         tga_pixel[2] = temp;
+         tga_pixel += tga_comp;
+      }
+   }
+
+   // convert to target component count
+   if (req_comp && req_comp != tga_comp)
+      tga_data = stbi__convert_format(tga_data, tga_comp, req_comp, tga_width, tga_height);
+
+   //   the things I do to get rid of an error message, and yet keep
+   //   Microsoft's C compilers happy... [8^(
+   tga_palette_start = tga_palette_len = tga_palette_bits =
+         tga_x_origin = tga_y_origin = 0;
+   //   OK, done
+   return tga_data;
+}
+#endif
+
+// *************************************************************************************************
+// Photoshop PSD loader -- PD by Thatcher Ulrich, integration by Nicolas Schulz, tweaked by STB
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_test(stbi__context *s)
+{
+   int r = (stbi__get32be(s) == 0x38425053);
+   stbi__rewind(s);
+   return r;
+}
+
+static stbi_uc *stbi__psd_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   int   pixelCount;
+   int channelCount, compression;
+   int channel, i, count, len;
+   int bitdepth;
+   int w,h;
+   stbi_uc *out;
+
+   // Check identifier
+   if (stbi__get32be(s) != 0x38425053)   // "8BPS"
+      return stbi__errpuc("not PSD", "Corrupt PSD image");
+
+   // Check file type version.
+   if (stbi__get16be(s) != 1)
+      return stbi__errpuc("wrong version", "Unsupported version of PSD image");
+
+   // Skip 6 reserved bytes.
+   stbi__skip(s, 6 );
+
+   // Read the number of channels (R, G, B, A, etc).
+   channelCount = stbi__get16be(s);
+   if (channelCount < 0 || channelCount > 16)
+      return stbi__errpuc("wrong channel count", "Unsupported number of channels in PSD image");
+
+   // Read the rows and columns of the image.
+   h = stbi__get32be(s);
+   w = stbi__get32be(s);
+
+   // Make sure the depth is 8 bits.
+   bitdepth = stbi__get16be(s);
+   if (bitdepth != 8 && bitdepth != 16)
+      return stbi__errpuc("unsupported bit depth", "PSD bit depth is not 8 or 16 bit");
+
+   // Make sure the color mode is RGB.
+   // Valid options are:
+   //   0: Bitmap
+   //   1: Grayscale
+   //   2: Indexed color
+   //   3: RGB color
+   //   4: CMYK color
+   //   7: Multichannel
+   //   8: Duotone
+   //   9: Lab color
+   if (stbi__get16be(s) != 3)
+      return stbi__errpuc("wrong color format", "PSD is not in RGB color format");
+
+   // Skip the Mode Data.  (It's the palette for indexed color; other info for other modes.)
+   stbi__skip(s,stbi__get32be(s) );
+
+   // Skip the image resources.  (resolution, pen tool paths, etc)
+   stbi__skip(s, stbi__get32be(s) );
+
+   // Skip the reserved data.
+   stbi__skip(s, stbi__get32be(s) );
+
+   // Find out if the data is compressed.
+   // Known values:
+   //   0: no compression
+   //   1: RLE compressed
+   compression = stbi__get16be(s);
+   if (compression > 1)
+      return stbi__errpuc("bad compression", "PSD has an unknown compression format");
+
+   // Create the destination image.
+   out = (stbi_uc *) stbi__malloc(4 * w*h);
+   if (!out) return stbi__errpuc("outofmem", "Out of memory");
+   pixelCount = w*h;
+
+   // Initialize the data to zero.
+   //memset( out, 0, pixelCount * 4 );
+
+   // Finally, the image data.
+   if (compression) {
+      // RLE as used by .PSD and .TIFF
+      // Loop until you get the number of unpacked bytes you are expecting:
+      //     Read the next source byte into n.
+      //     If n is between 0 and 127 inclusive, copy the next n+1 bytes literally.
+      //     Else if n is between -127 and -1 inclusive, copy the next byte -n+1 times.
+      //     Else if n is 128, noop.
+      // Endloop
+
+      // The RLE-compressed data is preceeded by a 2-byte data count for each row in the data,
+      // which we're going to just skip.
+      stbi__skip(s, h * channelCount * 2 );
+
+      // Read the RLE data by channel.
+      for (channel = 0; channel < 4; channel++) {
+         stbi_uc *p;
+
+         p = out+channel;
+         if (channel >= channelCount) {
+            // Fill this channel with default data.
+            for (i = 0; i < pixelCount; i++, p += 4)
+               *p = (channel == 3 ? 255 : 0);
+         } else {
+            // Read the RLE data.
+            count = 0;
+            while (count < pixelCount) {
+               len = stbi__get8(s);
+               if (len == 128) {
+                  // No-op.
+               } else if (len < 128) {
+                  // Copy next len+1 bytes literally.
+                  len++;
+                  count += len;
+                  while (len) {
+                     *p = stbi__get8(s);
+                     p += 4;
+                     len--;
+                  }
+               } else if (len > 128) {
+                  stbi_uc   val;
+                  // Next -len+1 bytes in the dest are replicated from next source byte.
+                  // (Interpret len as a negative 8-bit int.)
+                  len ^= 0x0FF;
+                  len += 2;
+                  val = stbi__get8(s);
+                  count += len;
+                  while (len) {
+                     *p = val;
+                     p += 4;
+                     len--;
+                  }
+               }
+            }
+         }
+      }
+
+   } else {
+      // We're at the raw image data.  It's each channel in order (Red, Green, Blue, Alpha, ...)
+      // where each channel consists of an 8-bit value for each pixel in the image.
+
+      // Read the data by channel.
+      for (channel = 0; channel < 4; channel++) {
+         stbi_uc *p;
+
+         p = out + channel;
+         if (channel >= channelCount) {
+            // Fill this channel with default data.
+            stbi_uc val = channel == 3 ? 255 : 0;
+            for (i = 0; i < pixelCount; i++, p += 4)
+               *p = val;
+         } else {
+            // Read the data.
+            if (bitdepth == 16) {
+               for (i = 0; i < pixelCount; i++, p += 4)
+                  *p = (stbi_uc) (stbi__get16be(s) >> 8);
+            } else {
+               for (i = 0; i < pixelCount; i++, p += 4)
+                  *p = stbi__get8(s);
+            }
+         }
+      }
+   }
+
+   if (req_comp && req_comp != 4) {
+      out = stbi__convert_format(out, 4, req_comp, w, h);
+      if (out == NULL) return out; // stbi__convert_format frees input on failure
+   }
+
+   if (comp) *comp = 4;
+   *y = h;
+   *x = w;
+
+   return out;
+}
+#endif
+
+// *************************************************************************************************
+// Softimage PIC loader
+// by Tom Seddon
+//
+// See http://softimage.wiki.softimage.com/index.php/INFO:_PIC_file_format
+// See http://ozviz.wasp.uwa.edu.au/~pbourke/dataformats/softimagepic/
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_is4(stbi__context *s,const char *str)
+{
+   int i;
+   for (i=0; i<4; ++i)
+      if (stbi__get8(s) != (stbi_uc)str[i])
+         return 0;
+
+   return 1;
+}
+
+static int stbi__pic_test_core(stbi__context *s)
+{
+   int i;
+
+   if (!stbi__pic_is4(s,"\x53\x80\xF6\x34"))
+      return 0;
+
+   for(i=0;i<84;++i)
+      stbi__get8(s);
+
+   if (!stbi__pic_is4(s,"PICT"))
+      return 0;
+
+   return 1;
+}
+
+typedef struct
+{
+   stbi_uc size,type,channel;
+} stbi__pic_packet;
+
+static stbi_uc *stbi__readval(stbi__context *s, int channel, stbi_uc *dest)
+{
+   int mask=0x80, i;
+
+   for (i=0; i<4; ++i, mask>>=1) {
+      if (channel & mask) {
+         if (stbi__at_eof(s)) return stbi__errpuc("bad file","PIC file too short");
+         dest[i]=stbi__get8(s);
+      }
+   }
+
+   return dest;
+}
+
+static void stbi__copyval(int channel,stbi_uc *dest,const stbi_uc *src)
+{
+   int mask=0x80,i;
+
+   for (i=0;i<4; ++i, mask>>=1)
+      if (channel&mask)
+         dest[i]=src[i];
+}
+
+static stbi_uc *stbi__pic_load_core(stbi__context *s,int width,int height,int *comp, stbi_uc *result)
+{
+   int act_comp=0,num_packets=0,y,chained;
+   stbi__pic_packet packets[10];
+
+   // this will (should...) cater for even some bizarre stuff like having data
+    // for the same channel in multiple packets.
+   do {
+      stbi__pic_packet *packet;
+
+      if (num_packets==sizeof(packets)/sizeof(packets[0]))
+         return stbi__errpuc("bad format","too many packets");
+
+      packet = &packets[num_packets++];
+
+      chained = stbi__get8(s);
+      packet->size    = stbi__get8(s);
+      packet->type    = stbi__get8(s);
+      packet->channel = stbi__get8(s);
+
+      act_comp |= packet->channel;
+
+      if (stbi__at_eof(s))          return stbi__errpuc("bad file","file too short (reading packets)");
+      if (packet->size != 8)  return stbi__errpuc("bad format","packet isn't 8bpp");
+   } while (chained);
+
+   *comp = (act_comp & 0x10 ? 4 : 3); // has alpha channel?
+
+   for(y=0; y<height; ++y) {
+      int packet_idx;
+
+      for(packet_idx=0; packet_idx < num_packets; ++packet_idx) {
+         stbi__pic_packet *packet = &packets[packet_idx];
+         stbi_uc *dest = result+y*width*4;
+
+         switch (packet->type) {
+            default:
+               return stbi__errpuc("bad format","packet has bad compression type");
+
+            case 0: {//uncompressed
+               int x;
+
+               for(x=0;x<width;++x, dest+=4)
+                  if (!stbi__readval(s,packet->channel,dest))
+                     return 0;
+               break;
+            }
+
+            case 1://Pure RLE
+               {
+                  int left=width, i;
+
+                  while (left>0) {
+                     stbi_uc count,value[4];
+
+                     count=stbi__get8(s);
+                     if (stbi__at_eof(s))   return stbi__errpuc("bad file","file too short (pure read count)");
+
+                     if (count > left)
+                        count = (stbi_uc) left;
+
+                     if (!stbi__readval(s,packet->channel,value))  return 0;
+
+                     for(i=0; i<count; ++i,dest+=4)
+                        stbi__copyval(packet->channel,dest,value);
+                     left -= count;
+                  }
+               }
+               break;
+
+            case 2: {//Mixed RLE
+               int left=width;
+               while (left>0) {
+                  int count = stbi__get8(s), i;
+                  if (stbi__at_eof(s))  return stbi__errpuc("bad file","file too short (mixed read count)");
+
+                  if (count >= 128) { // Repeated
+                     stbi_uc value[4];
+
+                     if (count==128)
+                        count = stbi__get16be(s);
+                     else
+                        count -= 127;
+                     if (count > left)
+                        return stbi__errpuc("bad file","scanline overrun");
+
+                     if (!stbi__readval(s,packet->channel,value))
+                        return 0;
+
+                     for(i=0;i<count;++i, dest += 4)
+                        stbi__copyval(packet->channel,dest,value);
+                  } else { // Raw
+                     ++count;
+                     if (count>left) return stbi__errpuc("bad file","scanline overrun");
+
+                     for(i=0;i<count;++i, dest+=4)
+                        if (!stbi__readval(s,packet->channel,dest))
+                           return 0;
+                  }
+                  left-=count;
+               }
+               break;
+            }
+         }
+      }
+   }
+
+   return result;
+}
+
+static stbi_uc *stbi__pic_load(stbi__context *s,int *px,int *py,int *comp,int req_comp)
+{
+   stbi_uc *result;
+   int i, x,y;
+
+   for (i=0; i<92; ++i)
+      stbi__get8(s);
+
+   x = stbi__get16be(s);
+   y = stbi__get16be(s);
+   if (stbi__at_eof(s))  return stbi__errpuc("bad file","file too short (pic header)");
+   if ((1 << 28) / x < y) return stbi__errpuc("too large", "Image too large to decode");
+
+   stbi__get32be(s); //skip `ratio'
+   stbi__get16be(s); //skip `fields'
+   stbi__get16be(s); //skip `pad'
+
+   // intermediate buffer is RGBA
+   result = (stbi_uc *) stbi__malloc(x*y*4);
+   memset(result, 0xff, x*y*4);
+
+   if (!stbi__pic_load_core(s,x,y,comp, result)) {
+      STBI_FREE(result);
+      result=0;
+   }
+   *px = x;
+   *py = y;
+   if (req_comp == 0) req_comp = *comp;
+   result=stbi__convert_format(result,4,req_comp,x,y);
+
+   return result;
+}
+
+static int stbi__pic_test(stbi__context *s)
+{
+   int r = stbi__pic_test_core(s);
+   stbi__rewind(s);
+   return r;
+}
+#endif
+
+// *************************************************************************************************
+// GIF loader -- public domain by Jean-Marc Lienher -- simplified/shrunk by stb
+
+#ifndef STBI_NO_GIF
+typedef struct
+{
+   stbi__int16 prefix;
+   stbi_uc first;
+   stbi_uc suffix;
+} stbi__gif_lzw;
+
+typedef struct
+{
+   int w,h;
+   stbi_uc *out, *old_out;             // output buffer (always 4 components)
+   int flags, bgindex, ratio, transparent, eflags, delay;
+   stbi_uc  pal[256][4];
+   stbi_uc lpal[256][4];
+   stbi__gif_lzw codes[4096];
+   stbi_uc *color_table;
+   int parse, step;
+   int lflags;
+   int start_x, start_y;
+   int max_x, max_y;
+   int cur_x, cur_y;
+   int line_size;
+} stbi__gif;
+
+static int stbi__gif_test_raw(stbi__context *s)
+{
+   int sz;
+   if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8') return 0;
+   sz = stbi__get8(s);
+   if (sz != '9' && sz != '7') return 0;
+   if (stbi__get8(s) != 'a') return 0;
+   return 1;
+}
+
+static int stbi__gif_test(stbi__context *s)
+{
+   int r = stbi__gif_test_raw(s);
+   stbi__rewind(s);
+   return r;
+}
+
+static void stbi__gif_parse_colortable(stbi__context *s, stbi_uc pal[256][4], int num_entries, int transp)
+{
+   int i;
+   for (i=0; i < num_entries; ++i) {
+      pal[i][2] = stbi__get8(s);
+      pal[i][1] = stbi__get8(s);
+      pal[i][0] = stbi__get8(s);
+      pal[i][3] = transp == i ? 0 : 255;
+   }
+}
+
+static int stbi__gif_header(stbi__context *s, stbi__gif *g, int *comp, int is_info)
+{
+   stbi_uc version;
+   if (stbi__get8(s) != 'G' || stbi__get8(s) != 'I' || stbi__get8(s) != 'F' || stbi__get8(s) != '8')
+      return stbi__err("not GIF", "Corrupt GIF");
+
+   version = stbi__get8(s);
+   if (version != '7' && version != '9')    return stbi__err("not GIF", "Corrupt GIF");
+   if (stbi__get8(s) != 'a')                return stbi__err("not GIF", "Corrupt GIF");
+
+   stbi__g_failure_reason = "";
+   g->w = stbi__get16le(s);
+   g->h = stbi__get16le(s);
+   g->flags = stbi__get8(s);
+   g->bgindex = stbi__get8(s);
+   g->ratio = stbi__get8(s);
+   g->transparent = -1;
+
+   if (comp != 0) *comp = 4;  // can't actually tell whether it's 3 or 4 until we parse the comments
+
+   if (is_info) return 1;
+
+   if (g->flags & 0x80)
+      stbi__gif_parse_colortable(s,g->pal, 2 << (g->flags & 7), -1);
+
+   return 1;
+}
+
+static int stbi__gif_info_raw(stbi__context *s, int *x, int *y, int *comp)
+{
+   stbi__gif g;
+   if (!stbi__gif_header(s, &g, comp, 1)) {
+      stbi__rewind( s );
+      return 0;
+   }
+   if (x) *x = g.w;
+   if (y) *y = g.h;
+   return 1;
+}
+
+static void stbi__out_gif_code(stbi__gif *g, stbi__uint16 code)
+{
+   stbi_uc *p, *c;
+
+   // recurse to decode the prefixes, since the linked-list is backwards,
+   // and working backwards through an interleaved image would be nasty
+   if (g->codes[code].prefix >= 0)
+      stbi__out_gif_code(g, g->codes[code].prefix);
+
+   if (g->cur_y >= g->max_y) return;
+
+   p = &g->out[g->cur_x + g->cur_y];
+   c = &g->color_table[g->codes[code].suffix * 4];
+
+   if (c[3] >= 128) {
+      p[0] = c[2];
+      p[1] = c[1];
+      p[2] = c[0];
+      p[3] = c[3];
+   }
+   g->cur_x += 4;
+
+   if (g->cur_x >= g->max_x) {
+      g->cur_x = g->start_x;
+      g->cur_y += g->step;
+
+      while (g->cur_y >= g->max_y && g->parse > 0) {
+         g->step = (1 << g->parse) * g->line_size;
+         g->cur_y = g->start_y + (g->step >> 1);
+         --g->parse;
+      }
+   }
+}
+
+static stbi_uc *stbi__process_gif_raster(stbi__context *s, stbi__gif *g)
+{
+   stbi_uc lzw_cs;
+   stbi__int32 len, init_code;
+   stbi__uint32 first;
+   stbi__int32 codesize, codemask, avail, oldcode, bits, valid_bits, clear;
+   stbi__gif_lzw *p;
+
+   lzw_cs = stbi__get8(s);
+   if (lzw_cs > 12) return NULL;
+   clear = 1 << lzw_cs;
+   first = 1;
+   codesize = lzw_cs + 1;
+   codemask = (1 << codesize) - 1;
+   bits = 0;
+   valid_bits = 0;
+   for (init_code = 0; init_code < clear; init_code++) {
+      g->codes[init_code].prefix = -1;
+      g->codes[init_code].first = (stbi_uc) init_code;
+      g->codes[init_code].suffix = (stbi_uc) init_code;
+   }
+
+   // support no starting clear code
+   avail = clear+2;
+   oldcode = -1;
+
+   len = 0;
+   for(;;) {
+      if (valid_bits < codesize) {
+         if (len == 0) {
+            len = stbi__get8(s); // start new block
+            if (len == 0)
+               return g->out;
+         }
+         --len;
+         bits |= (stbi__int32) stbi__get8(s) << valid_bits;
+         valid_bits += 8;
+      } else {
+         stbi__int32 code = bits & codemask;
+         bits >>= codesize;
+         valid_bits -= codesize;
+         // @OPTIMIZE: is there some way we can accelerate the non-clear path?
+         if (code == clear) {  // clear code
+            codesize = lzw_cs + 1;
+            codemask = (1 << codesize) - 1;
+            avail = clear + 2;
+            oldcode = -1;
+            first = 0;
+         } else if (code == clear + 1) { // end of stream code
+            stbi__skip(s, len);
+            while ((len = stbi__get8(s)) > 0)
+               stbi__skip(s,len);
+            return g->out;
+         } else if (code <= avail) {
+            if (first) return stbi__errpuc("no clear code", "Corrupt GIF");
+
+            if (oldcode >= 0) {
+               p = &g->codes[avail++];
+               if (avail > 4096)        return stbi__errpuc("too many codes", "Corrupt GIF");
+               p->prefix = (stbi__int16) oldcode;
+               p->first = g->codes[oldcode].first;
+               p->suffix = (code == avail) ? p->first : g->codes[code].first;
+            } else if (code == avail)
+               return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+
+            stbi__out_gif_code(g, (stbi__uint16) code);
+
+            if ((avail & codemask) == 0 && avail <= 0x0FFF) {
+               codesize++;
+               codemask = (1 << codesize) - 1;
+            }
+
+            oldcode = code;
+         } else {
+            return stbi__errpuc("illegal code in raster", "Corrupt GIF");
+         }
+      }
+   }
+}
+
+static void stbi__fill_gif_background(stbi__gif *g, int x0, int y0, int x1, int y1)
+{
+   int x, y;
+   stbi_uc *c = g->pal[g->bgindex];
+   for (y = y0; y < y1; y += 4 * g->w) {
+      for (x = x0; x < x1; x += 4) {
+         stbi_uc *p  = &g->out[y + x];
+         p[0] = c[2];
+         p[1] = c[1];
+         p[2] = c[0];
+         p[3] = 0;
+      }
+   }
+}
+
+// this function is designed to support animated gifs, although stb_image doesn't support it
+static stbi_uc *stbi__gif_load_next(stbi__context *s, stbi__gif *g, int *comp, int req_comp)
+{
+   int i;
+   stbi_uc *prev_out = 0;
+
+   if (g->out == 0 && !stbi__gif_header(s, g, comp,0))
+      return 0; // stbi__g_failure_reason set by stbi__gif_header
+
+   prev_out = g->out;
+   g->out = (stbi_uc *) stbi__malloc(4 * g->w * g->h);
+   if (g->out == 0) return stbi__errpuc("outofmem", "Out of memory");
+
+   switch ((g->eflags & 0x1C) >> 2) {
+      case 0: // unspecified (also always used on 1st frame)
+         stbi__fill_gif_background(g, 0, 0, 4 * g->w, 4 * g->w * g->h);
+         break;
+      case 1: // do not dispose
+         if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h);
+         g->old_out = prev_out;
+         break;
+      case 2: // dispose to background
+         if (prev_out) memcpy(g->out, prev_out, 4 * g->w * g->h);
+         stbi__fill_gif_background(g, g->start_x, g->start_y, g->max_x, g->max_y);
+         break;
+      case 3: // dispose to previous
+         if (g->old_out) {
+            for (i = g->start_y; i < g->max_y; i += 4 * g->w)
+               memcpy(&g->out[i + g->start_x], &g->old_out[i + g->start_x], g->max_x - g->start_x);
+         }
+         break;
+   }
+
+   for (;;) {
+      switch (stbi__get8(s)) {
+         case 0x2C: /* Image Descriptor */
+         {
+            int prev_trans = -1;
+            stbi__int32 x, y, w, h;
+            stbi_uc *o;
+
+            x = stbi__get16le(s);
+            y = stbi__get16le(s);
+            w = stbi__get16le(s);
+            h = stbi__get16le(s);
+            if (((x + w) > (g->w)) || ((y + h) > (g->h)))
+               return stbi__errpuc("bad Image Descriptor", "Corrupt GIF");
+
+            g->line_size = g->w * 4;
+            g->start_x = x * 4;
+            g->start_y = y * g->line_size;
+            g->max_x   = g->start_x + w * 4;
+            g->max_y   = g->start_y + h * g->line_size;
+            g->cur_x   = g->start_x;
+            g->cur_y   = g->start_y;
+
+            g->lflags = stbi__get8(s);
+
+            if (g->lflags & 0x40) {
+               g->step = 8 * g->line_size; // first interlaced spacing
+               g->parse = 3;
+            } else {
+               g->step = g->line_size;
+               g->parse = 0;
+            }
+
+            if (g->lflags & 0x80) {
+               stbi__gif_parse_colortable(s,g->lpal, 2 << (g->lflags & 7), g->eflags & 0x01 ? g->transparent : -1);
+               g->color_table = (stbi_uc *) g->lpal;
+            } else if (g->flags & 0x80) {
+               if (g->transparent >= 0 && (g->eflags & 0x01)) {
+                  prev_trans = g->pal[g->transparent][3];
+                  g->pal[g->transparent][3] = 0;
+               }
+               g->color_table = (stbi_uc *) g->pal;
+            } else
+               return stbi__errpuc("missing color table", "Corrupt GIF");
+
+            o = stbi__process_gif_raster(s, g);
+            if (o == NULL) return NULL;
+
+            if (prev_trans != -1)
+               g->pal[g->transparent][3] = (stbi_uc) prev_trans;
+
+            return o;
+         }
+
+         case 0x21: // Comment Extension.
+         {
+            int len;
+            if (stbi__get8(s) == 0xF9) { // Graphic Control Extension.
+               len = stbi__get8(s);
+               if (len == 4) {
+                  g->eflags = stbi__get8(s);
+                  g->delay = stbi__get16le(s);
+                  g->transparent = stbi__get8(s);
+               } else {
+                  stbi__skip(s, len);
+                  break;
+               }
+            }
+            while ((len = stbi__get8(s)) != 0)
+               stbi__skip(s, len);
+            break;
+         }
+
+         case 0x3B: // gif stream termination code
+            return (stbi_uc *) s; // using '1' causes warning on some compilers
+
+         default:
+            return stbi__errpuc("unknown code", "Corrupt GIF");
+      }
+   }
+
+   STBI_NOTUSED(req_comp);
+}
+
+static stbi_uc *stbi__gif_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   stbi_uc *u = 0;
+   stbi__gif g;
+   memset(&g, 0, sizeof(g));
+
+   u = stbi__gif_load_next(s, &g, comp, req_comp);
+   if (u == (stbi_uc *) s) u = 0;  // end of animated gif marker
+   if (u) {
+      *x = g.w;
+      *y = g.h;
+      if (req_comp && req_comp != 4)
+         u = stbi__convert_format(u, 4, req_comp, g.w, g.h);
+   }
+   else if (g.out)
+      STBI_FREE(g.out);
+
+   return u;
+}
+
+static int stbi__gif_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   return stbi__gif_info_raw(s,x,y,comp);
+}
+#endif
+
+// *************************************************************************************************
+// Radiance RGBE HDR loader
+// originally by Nicolas Schulz
+#ifndef STBI_NO_HDR
+static int stbi__hdr_test_core(stbi__context *s)
+{
+   const char *signature = "#?RADIANCE\n";
+   int i;
+   for (i=0; signature[i]; ++i)
+      if (stbi__get8(s) != signature[i])
+         return 0;
+   return 1;
+}
+
+static int stbi__hdr_test(stbi__context* s)
+{
+   int r = stbi__hdr_test_core(s);
+   stbi__rewind(s);
+   return r;
+}
+
+#define STBI__HDR_BUFLEN  1024
+static char *stbi__hdr_gettoken(stbi__context *z, char *buffer)
+{
+   int len=0;
+   char c = '\0';
+
+   c = (char) stbi__get8(z);
+
+   while (!stbi__at_eof(z) && c != '\n') {
+      buffer[len++] = c;
+      if (len == STBI__HDR_BUFLEN-1) {
+         // flush to end of line
+         while (!stbi__at_eof(z) && stbi__get8(z) != '\n')
+            ;
+         break;
+      }
+      c = (char) stbi__get8(z);
+   }
+
+   buffer[len] = 0;
+   return buffer;
+}
+
+static void stbi__hdr_convert(float *output, stbi_uc *input, int req_comp)
+{
+   if ( input[3] != 0 ) {
+      float f1;
+      // Exponent
+      f1 = (float) ldexp(1.0f, input[3] - (int)(128 + 8));
+      if (req_comp <= 2)
+         output[0] = (input[0] + input[1] + input[2]) * f1 / 3;
+      else {
+         output[0] = input[0] * f1;
+         output[1] = input[1] * f1;
+         output[2] = input[2] * f1;
+      }
+      if (req_comp == 2) output[1] = 1;
+      if (req_comp == 4) output[3] = 1;
+   } else {
+      switch (req_comp) {
+         case 4: output[3] = 1; /* fallthrough */
+         case 3: output[0] = output[1] = output[2] = 0;
+                 break;
+         case 2: output[1] = 1; /* fallthrough */
+         case 1: output[0] = 0;
+                 break;
+      }
+   }
+}
+
+static float *stbi__hdr_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   char buffer[STBI__HDR_BUFLEN];
+   char *token;
+   int valid = 0;
+   int width, height;
+   stbi_uc *scanline;
+   float *hdr_data;
+   int len;
+   unsigned char count, value;
+   int i, j, k, c1,c2, z;
+
+
+   // Check identifier
+   if (strcmp(stbi__hdr_gettoken(s,buffer), "#?RADIANCE") != 0)
+      return stbi__errpf("not HDR", "Corrupt HDR image");
+
+   // Parse header
+   for(;;) {
+      token = stbi__hdr_gettoken(s,buffer);
+      if (token[0] == 0) break;
+      if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+   }
+
+   if (!valid)    return stbi__errpf("unsupported format", "Unsupported HDR format");
+
+   // Parse width and height
+   // can't use sscanf() if we're not using stdio!
+   token = stbi__hdr_gettoken(s,buffer);
+   if (strncmp(token, "-Y ", 3))  return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+   token += 3;
+   height = (int) strtol(token, &token, 10);
+   while (*token == ' ') ++token;
+   if (strncmp(token, "+X ", 3))  return stbi__errpf("unsupported data layout", "Unsupported HDR format");
+   token += 3;
+   width = (int) strtol(token, NULL, 10);
+
+   *x = width;
+   *y = height;
+
+   if (comp) *comp = 3;
+   if (req_comp == 0) req_comp = 3;
+
+   // Read data
+   hdr_data = (float *) stbi__malloc(height * width * req_comp * sizeof(float));
+
+   // Load image data
+   // image data is stored as some number of sca
+   if ( width < 8 || width >= 32768) {
+      // Read flat data
+      for (j=0; j < height; ++j) {
+         for (i=0; i < width; ++i) {
+            stbi_uc rgbe[4];
+           main_decode_loop:
+            stbi__getn(s, rgbe, 4);
+            stbi__hdr_convert(hdr_data + j * width * req_comp + i * req_comp, rgbe, req_comp);
+         }
+      }
+   } else {
+      // Read RLE-encoded data
+      scanline = NULL;
+
+      for (j = 0; j < height; ++j) {
+         c1 = stbi__get8(s);
+         c2 = stbi__get8(s);
+         len = stbi__get8(s);
+         if (c1 != 2 || c2 != 2 || (len & 0x80)) {
+            // not run-length encoded, so we have to actually use THIS data as a decoded
+            // pixel (note this can't be a valid pixel--one of RGB must be >= 128)
+            stbi_uc rgbe[4];
+            rgbe[0] = (stbi_uc) c1;
+            rgbe[1] = (stbi_uc) c2;
+            rgbe[2] = (stbi_uc) len;
+            rgbe[3] = (stbi_uc) stbi__get8(s);
+            stbi__hdr_convert(hdr_data, rgbe, req_comp);
+            i = 1;
+            j = 0;
+            STBI_FREE(scanline);
+            goto main_decode_loop; // yes, this makes no sense
+         }
+         len <<= 8;
+         len |= stbi__get8(s);
+         if (len != width) { STBI_FREE(hdr_data); STBI_FREE(scanline); return stbi__errpf("invalid decoded scanline length", "corrupt HDR"); }
+         if (scanline == NULL) scanline = (stbi_uc *) stbi__malloc(width * 4);
+
+         for (k = 0; k < 4; ++k) {
+            i = 0;
+            while (i < width) {
+               count = stbi__get8(s);
+               if (count > 128) {
+                  // Run
+                  value = stbi__get8(s);
+                  count -= 128;
+                  for (z = 0; z < count; ++z)
+                     scanline[i++ * 4 + k] = value;
+               } else {
+                  // Dump
+                  for (z = 0; z < count; ++z)
+                     scanline[i++ * 4 + k] = stbi__get8(s);
+               }
+            }
+         }
+         for (i=0; i < width; ++i)
+            stbi__hdr_convert(hdr_data+(j*width + i)*req_comp, scanline + i*4, req_comp);
+      }
+      STBI_FREE(scanline);
+   }
+
+   return hdr_data;
+}
+
+static int stbi__hdr_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   char buffer[STBI__HDR_BUFLEN];
+   char *token;
+   int valid = 0;
+
+   if (stbi__hdr_test(s) == 0) {
+       stbi__rewind( s );
+       return 0;
+   }
+
+   for(;;) {
+      token = stbi__hdr_gettoken(s,buffer);
+      if (token[0] == 0) break;
+      if (strcmp(token, "FORMAT=32-bit_rle_rgbe") == 0) valid = 1;
+   }
+
+   if (!valid) {
+       stbi__rewind( s );
+       return 0;
+   }
+   token = stbi__hdr_gettoken(s,buffer);
+   if (strncmp(token, "-Y ", 3)) {
+       stbi__rewind( s );
+       return 0;
+   }
+   token += 3;
+   *y = (int) strtol(token, &token, 10);
+   while (*token == ' ') ++token;
+   if (strncmp(token, "+X ", 3)) {
+       stbi__rewind( s );
+       return 0;
+   }
+   token += 3;
+   *x = (int) strtol(token, NULL, 10);
+   *comp = 3;
+   return 1;
+}
+#endif // STBI_NO_HDR
+
+#ifndef STBI_NO_BMP
+static int stbi__bmp_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   void *p;
+   stbi__bmp_data info;
+
+   info.all_a = 255;   
+   p = stbi__bmp_parse_header(s, &info);
+   stbi__rewind( s );
+   if (p == NULL)
+      return 0;
+   *x = s->img_x;
+   *y = s->img_y;
+   *comp = info.ma ? 4 : 3;
+   return 1;
+}
+#endif
+
+#ifndef STBI_NO_PSD
+static int stbi__psd_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int channelCount;
+   if (stbi__get32be(s) != 0x38425053) {
+       stbi__rewind( s );
+       return 0;
+   }
+   if (stbi__get16be(s) != 1) {
+       stbi__rewind( s );
+       return 0;
+   }
+   stbi__skip(s, 6);
+   channelCount = stbi__get16be(s);
+   if (channelCount < 0 || channelCount > 16) {
+       stbi__rewind( s );
+       return 0;
+   }
+   *y = stbi__get32be(s);
+   *x = stbi__get32be(s);
+   if (stbi__get16be(s) != 8) {
+       stbi__rewind( s );
+       return 0;
+   }
+   if (stbi__get16be(s) != 3) {
+       stbi__rewind( s );
+       return 0;
+   }
+   *comp = 4;
+   return 1;
+}
+#endif
+
+#ifndef STBI_NO_PIC
+static int stbi__pic_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int act_comp=0,num_packets=0,chained;
+   stbi__pic_packet packets[10];
+
+   if (!stbi__pic_is4(s,"\x53\x80\xF6\x34")) {
+      stbi__rewind(s);
+      return 0;
+   }
+
+   stbi__skip(s, 88);
+
+   *x = stbi__get16be(s);
+   *y = stbi__get16be(s);
+   if (stbi__at_eof(s)) {
+      stbi__rewind( s);
+      return 0;
+   }
+   if ( (*x) != 0 && (1 << 28) / (*x) < (*y)) {
+      stbi__rewind( s );
+      return 0;
+   }
+
+   stbi__skip(s, 8);
+
+   do {
+      stbi__pic_packet *packet;
+
+      if (num_packets==sizeof(packets)/sizeof(packets[0]))
+         return 0;
+
+      packet = &packets[num_packets++];
+      chained = stbi__get8(s);
+      packet->size    = stbi__get8(s);
+      packet->type    = stbi__get8(s);
+      packet->channel = stbi__get8(s);
+      act_comp |= packet->channel;
+
+      if (stbi__at_eof(s)) {
+          stbi__rewind( s );
+          return 0;
+      }
+      if (packet->size != 8) {
+          stbi__rewind( s );
+          return 0;
+      }
+   } while (chained);
+
+   *comp = (act_comp & 0x10 ? 4 : 3);
+
+   return 1;
+}
+#endif
+
+// *************************************************************************************************
+// Portable Gray Map and Portable Pixel Map loader
+// by Ken Miller
+//
+// PGM: http://netpbm.sourceforge.net/doc/pgm.html
+// PPM: http://netpbm.sourceforge.net/doc/ppm.html
+//
+// Known limitations:
+//    Does not support comments in the header section
+//    Does not support ASCII image data (formats P2 and P3)
+//    Does not support 16-bit-per-channel
+
+#ifndef STBI_NO_PNM
+
+static int      stbi__pnm_test(stbi__context *s)
+{
+   char p, t;
+   p = (char) stbi__get8(s);
+   t = (char) stbi__get8(s);
+   if (p != 'P' || (t != '5' && t != '6')) {
+       stbi__rewind( s );
+       return 0;
+   }
+   return 1;
+}
+
+static stbi_uc *stbi__pnm_load(stbi__context *s, int *x, int *y, int *comp, int req_comp)
+{
+   stbi_uc *out;
+   if (!stbi__pnm_info(s, (int *)&s->img_x, (int *)&s->img_y, (int *)&s->img_n))
+      return 0;
+   *x = s->img_x;
+   *y = s->img_y;
+   *comp = s->img_n;
+
+   out = (stbi_uc *) stbi__malloc(s->img_n * s->img_x * s->img_y);
+   if (!out) return stbi__errpuc("outofmem", "Out of memory");
+   stbi__getn(s, out, s->img_n * s->img_x * s->img_y);
+
+   if (req_comp && req_comp != s->img_n) {
+      out = stbi__convert_format(out, s->img_n, req_comp, s->img_x, s->img_y);
+      if (out == NULL) return out; // stbi__convert_format frees input on failure
+   }
+   return out;
+}
+
+static int      stbi__pnm_isspace(char c)
+{
+   return c == ' ' || c == '\t' || c == '\n' || c == '\v' || c == '\f' || c == '\r';
+}
+
+static void     stbi__pnm_skip_whitespace(stbi__context *s, char *c)
+{
+   for (;;) {
+      while (!stbi__at_eof(s) && stbi__pnm_isspace(*c))
+         *c = (char) stbi__get8(s);
+
+      if (stbi__at_eof(s) || *c != '#')
+         break;
+
+      while (!stbi__at_eof(s) && *c != '\n' && *c != '\r' )
+         *c = (char) stbi__get8(s);
+   }
+}
+
+static int      stbi__pnm_isdigit(char c)
+{
+   return c >= '0' && c <= '9';
+}
+
+static int      stbi__pnm_getinteger(stbi__context *s, char *c)
+{
+   int value = 0;
+
+   while (!stbi__at_eof(s) && stbi__pnm_isdigit(*c)) {
+      value = value*10 + (*c - '0');
+      *c = (char) stbi__get8(s);
+   }
+
+   return value;
+}
+
+static int      stbi__pnm_info(stbi__context *s, int *x, int *y, int *comp)
+{
+   int maxv;
+   char c, p, t;
+
+   stbi__rewind( s );
+
+   // Get identifier
+   p = (char) stbi__get8(s);
+   t = (char) stbi__get8(s);
+   if (p != 'P' || (t != '5' && t != '6')) {
+       stbi__rewind( s );
+       return 0;
+   }
+
+   *comp = (t == '6') ? 3 : 1;  // '5' is 1-component .pgm; '6' is 3-component .ppm
+
+   c = (char) stbi__get8(s);
+   stbi__pnm_skip_whitespace(s, &c);
+
+   *x = stbi__pnm_getinteger(s, &c); // read width
+   stbi__pnm_skip_whitespace(s, &c);
+
+   *y = stbi__pnm_getinteger(s, &c); // read height
+   stbi__pnm_skip_whitespace(s, &c);
+
+   maxv = stbi__pnm_getinteger(s, &c);  // read max value
+
+   if (maxv > 255)
+      return stbi__err("max value > 255", "PPM image not 8-bit");
+   else
+      return 1;
+}
+#endif
+
+static int stbi__info_main(stbi__context *s, int *x, int *y, int *comp)
+{
+   #ifndef STBI_NO_JPEG
+   if (stbi__jpeg_info(s, x, y, comp)) return 1;
+   #endif
+
+   #ifndef STBI_NO_PNG
+   if (stbi__png_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_GIF
+   if (stbi__gif_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_BMP
+   if (stbi__bmp_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_PSD
+   if (stbi__psd_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_PIC
+   if (stbi__pic_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_PNM
+   if (stbi__pnm_info(s, x, y, comp))  return 1;
+   #endif
+
+   #ifndef STBI_NO_HDR
+   if (stbi__hdr_info(s, x, y, comp))  return 1;
+   #endif
+
+   // test tga last because it's a crappy test!
+   #ifndef STBI_NO_TGA
+   if (stbi__tga_info(s, x, y, comp))
+       return 1;
+   #endif
+   return stbi__err("unknown image type", "Image not of any known type, or corrupt");
+}
+
+#ifndef STBI_NO_STDIO
+STBIDEF int stbi_info(char const *filename, int *x, int *y, int *comp)
+{
+    FILE *f = stbi__fopen(filename, "rb");
+    int result;
+    if (!f) return stbi__err("can't fopen", "Unable to open file");
+    result = stbi_info_from_file(f, x, y, comp);
+    fclose(f);
+    return result;
+}
+
+STBIDEF int stbi_info_from_file(FILE *f, int *x, int *y, int *comp)
+{
+   int r;
+   stbi__context s;
+   long pos = ftell(f);
+   stbi__start_file(&s, f);
+   r = stbi__info_main(&s,x,y,comp);
+   fseek(f,pos,SEEK_SET);
+   return r;
+}
+#endif // !STBI_NO_STDIO
+
+STBIDEF int stbi_info_from_memory(stbi_uc const *buffer, int len, int *x, int *y, int *comp)
+{
+   stbi__context s;
+   stbi__start_mem(&s,buffer,len);
+   return stbi__info_main(&s,x,y,comp);
+}
+
+STBIDEF int stbi_info_from_callbacks(stbi_io_callbacks const *c, void *user, int *x, int *y, int *comp)
+{
+   stbi__context s;
+   stbi__start_callbacks(&s, (stbi_io_callbacks *) c, user);
+   return stbi__info_main(&s,x,y,comp);
+}
+
+#endif // STB_IMAGE_IMPLEMENTATION
+
+/*
+   revision history:
+      2.10  (2016-01-22) avoid warning introduced in 2.09 by STBI_REALLOC_SIZED
+      2.09  (2016-01-16) allow comments in PNM files
+                         16-bit-per-pixel TGA (not bit-per-component)
+                         info() for TGA could break due to .hdr handling
+                         info() for BMP to shares code instead of sloppy parse
+                         can use STBI_REALLOC_SIZED if allocator doesn't support realloc
+                         code cleanup
+      2.08  (2015-09-13) fix to 2.07 cleanup, reading RGB PSD as RGBA
+      2.07  (2015-09-13) fix compiler warnings
+                         partial animated GIF support
+                         limited 16-bpc PSD support
+                         #ifdef unused functions
+                         bug with < 92 byte PIC,PNM,HDR,TGA
+      2.06  (2015-04-19) fix bug where PSD returns wrong '*comp' value
+      2.05  (2015-04-19) fix bug in progressive JPEG handling, fix warning
+      2.04  (2015-04-15) try to re-enable SIMD on MinGW 64-bit
+      2.03  (2015-04-12) extra corruption checking (mmozeiko)
+                         stbi_set_flip_vertically_on_load (nguillemot)
+                         fix NEON support; fix mingw support
+      2.02  (2015-01-19) fix incorrect assert, fix warning
+      2.01  (2015-01-17) fix various warnings; suppress SIMD on gcc 32-bit without -msse2
+      2.00b (2014-12-25) fix STBI_MALLOC in progressive JPEG
+      2.00  (2014-12-25) optimize JPG, including x86 SSE2 & NEON SIMD (ryg)
+                         progressive JPEG (stb)
+                         PGM/PPM support (Ken Miller)
+                         STBI_MALLOC,STBI_REALLOC,STBI_FREE
+                         GIF bugfix -- seemingly never worked
+                         STBI_NO_*, STBI_ONLY_*
+      1.48  (2014-12-14) fix incorrectly-named assert()
+      1.47  (2014-12-14) 1/2/4-bit PNG support, both direct and paletted (Omar Cornut & stb)
+                         optimize PNG (ryg)
+                         fix bug in interlaced PNG with user-specified channel count (stb)
+      1.46  (2014-08-26)
+              fix broken tRNS chunk (colorkey-style transparency) in non-paletted PNG
+      1.45  (2014-08-16)
+              fix MSVC-ARM internal compiler error by wrapping malloc
+      1.44  (2014-08-07)
+              various warning fixes from Ronny Chevalier
+      1.43  (2014-07-15)
+              fix MSVC-only compiler problem in code changed in 1.42
+      1.42  (2014-07-09)
+              don't define _CRT_SECURE_NO_WARNINGS (affects user code)
+              fixes to stbi__cleanup_jpeg path
+              added STBI_ASSERT to avoid requiring assert.h
+      1.41  (2014-06-25)
+              fix search&replace from 1.36 that messed up comments/error messages
+      1.40  (2014-06-22)
+              fix gcc struct-initialization warning
+      1.39  (2014-06-15)
+              fix to TGA optimization when req_comp != number of components in TGA;
+              fix to GIF loading because BMP wasn't rewinding (whoops, no GIFs in my test suite)
+              add support for BMP version 5 (more ignored fields)
+      1.38  (2014-06-06)
+              suppress MSVC warnings on integer casts truncating values
+              fix accidental rename of 'skip' field of I/O
+      1.37  (2014-06-04)
+              remove duplicate typedef
+      1.36  (2014-06-03)
+              convert to header file single-file library
+              if de-iphone isn't set, load iphone images color-swapped instead of returning NULL
+      1.35  (2014-05-27)
+              various warnings
+              fix broken STBI_SIMD path
+              fix bug where stbi_load_from_file no longer left file pointer in correct place
+              fix broken non-easy path for 32-bit BMP (possibly never used)
+              TGA optimization by Arseny Kapoulkine
+      1.34  (unknown)
+              use STBI_NOTUSED in stbi__resample_row_generic(), fix one more leak in tga failure case
+      1.33  (2011-07-14)
+              make stbi_is_hdr work in STBI_NO_HDR (as specified), minor compiler-friendly improvements
+      1.32  (2011-07-13)
+              support for "info" function for all supported filetypes (SpartanJ)
+      1.31  (2011-06-20)
+              a few more leak fixes, bug in PNG handling (SpartanJ)
+      1.30  (2011-06-11)
+              added ability to load files via callbacks to accomidate custom input streams (Ben Wenger)
+              removed deprecated format-specific test/load functions
+              removed support for installable file formats (stbi_loader) -- would have been broken for IO callbacks anyway
+              error cases in bmp and tga give messages and don't leak (Raymond Barbiero, grisha)
+              fix inefficiency in decoding 32-bit BMP (David Woo)
+      1.29  (2010-08-16)
+              various warning fixes from Aurelien Pocheville
+      1.28  (2010-08-01)
+              fix bug in GIF palette transparency (SpartanJ)
+      1.27  (2010-08-01)
+              cast-to-stbi_uc to fix warnings
+      1.26  (2010-07-24)
+              fix bug in file buffering for PNG reported by SpartanJ
+      1.25  (2010-07-17)
+              refix trans_data warning (Won Chun)
+      1.24  (2010-07-12)
+              perf improvements reading from files on platforms with lock-heavy fgetc()
+              minor perf improvements for jpeg
+              deprecated type-specific functions so we'll get feedback if they're needed
+              attempt to fix trans_data warning (Won Chun)
+      1.23    fixed bug in iPhone support
+      1.22  (2010-07-10)
+              removed image *writing* support
+              stbi_info support from Jetro Lauha
+              GIF support from Jean-Marc Lienher
+              iPhone PNG-extensions from James Brown
+              warning-fixes from Nicolas Schulz and Janez Zemva (i.stbi__err. Janez (U+017D)emva)
+      1.21    fix use of 'stbi_uc' in header (reported by jon blow)
+      1.20    added support for Softimage PIC, by Tom Seddon
+      1.19    bug in interlaced PNG corruption check (found by ryg)
+      1.18  (2008-08-02)
+              fix a threading bug (local mutable static)
+      1.17    support interlaced PNG
+      1.16    major bugfix - stbi__convert_format converted one too many pixels
+      1.15    initialize some fields for thread safety
+      1.14    fix threadsafe conversion bug
+              header-file-only version (#define STBI_HEADER_FILE_ONLY before including)
+      1.13    threadsafe
+      1.12    const qualifiers in the API
+      1.11    Support installable IDCT, colorspace conversion routines
+      1.10    Fixes for 64-bit (don't use "unsigned long")
+              optimized upsampling by Fabian "ryg" Giesen
+      1.09    Fix format-conversion for PSD code (bad global variables!)
+      1.08    Thatcher Ulrich's PSD code integrated by Nicolas Schulz
+      1.07    attempt to fix C++ warning/errors again
+      1.06    attempt to fix C++ warning/errors again
+      1.05    fix TGA loading to return correct *comp and use good luminance calc
+      1.04    default float alpha is 1, not 255; use 'void *' for stbi_image_free
+      1.03    bugfixes to STBI_NO_STDIO, STBI_NO_HDR
+      1.02    support for (subset of) HDR files, float interface for preferred access to them
+      1.01    fix bug: possible bug in handling right-side up bmps... not sure
+              fix bug: the stbi__bmp_load() and stbi__tga_load() functions didn't work at all
+      1.00    interface to zlib that skips zlib header
+      0.99    correct handling of alpha in palette
+      0.98    TGA loader by lonesock; dynamically add loaders (untested)
+      0.97    jpeg errors on too large a file; also catch another malloc failure
+      0.96    fix detection of invalid v value - particleman@mollyrocket forum
+      0.95    during header scan, seek to markers in case of padding
+      0.94    STBI_NO_STDIO to disable stdio usage; rename all #defines the same
+      0.93    handle jpegtran output; verbose errors
+      0.92    read 4,8,16,24,32-bit BMP files of several formats
+      0.91    output 24-bit Windows 3.0 BMP files
+      0.90    fix a few more warnings; bump version number to approach 1.0
+      0.61    bugfixes due to Marc LeBlanc, Christopher Lloyd
+      0.60    fix compiling as c++
+      0.59    fix warnings: merge Dave Moore's -Wall fixes
+      0.58    fix bug: zlib uncompressed mode len/nlen was wrong endian
+      0.57    fix bug: jpg last huffman symbol before marker was >9 bits but less than 16 available
+      0.56    fix bug: zlib uncompressed mode len vs. nlen
+      0.55    fix bug: restart_interval not initialized to 0
+      0.54    allow NULL for 'int *comp'
+      0.53    fix bug in png 3->4; speedup png decoding
+      0.52    png handles req_comp=3,4 directly; minor cleanup; jpeg comments
+      0.51    obey req_comp requests, 1-component jpegs return as 1-component,
+              on 'test' only check type, not whether we support this variant
+      0.50  (2006-11-19)
+              first released version
+*/

nanovg/stb_truetype.h

@@ -0,0 +1,5011 @@
+// stb_truetype.h - v1.24 - public domain
+// authored from 2009-2020 by Sean Barrett / RAD Game Tools
+//
+// =======================================================================
+//
+//    NO SECURITY GUARANTEE -- DO NOT USE THIS ON UNTRUSTED FONT FILES
+//
+// This library does no range checking of the offsets found in the file,
+// meaning an attacker can use it to read arbitrary memory.
+//
+// =======================================================================
+//
+//   This library processes TrueType files:
+//        parse files
+//        extract glyph metrics
+//        extract glyph shapes
+//        render glyphs to one-channel bitmaps with antialiasing (box filter)
+//        render glyphs to one-channel SDF bitmaps (signed-distance field/function)
+//
+//   Todo:
+//        non-MS cmaps
+//        crashproof on bad data
+//        hinting? (no longer patented)
+//        cleartype-style AA?
+//        optimize: use simple memory allocator for intermediates
+//        optimize: build edge-list directly from curves
+//        optimize: rasterize directly from curves?
+//
+// ADDITIONAL CONTRIBUTORS
+//
+//   Mikko Mononen: compound shape support, more cmap formats
+//   Tor Andersson: kerning, subpixel rendering
+//   Dougall Johnson: OpenType / Type 2 font handling
+//   Daniel Ribeiro Maciel: basic GPOS-based kerning
+//
+//   Misc other:
+//       Ryan Gordon
+//       Simon Glass
+//       github:IntellectualKitty
+//       Imanol Celaya
+//       Daniel Ribeiro Maciel
+//
+//   Bug/warning reports/fixes:
+//       "Zer" on mollyrocket       Fabian "ryg" Giesen   github:NiLuJe
+//       Cass Everitt               Martins Mozeiko       github:aloucks
+//       stoiko (Haemimont Games)   Cap Petschulat        github:oyvindjam
+//       Brian Hook                 Omar Cornut           github:vassvik
+//       Walter van Niftrik         Ryan Griege
+//       David Gow                  Peter LaValle
+//       David Given                Sergey Popov
+//       Ivan-Assen Ivanov          Giumo X. Clanjor
+//       Anthony Pesch              Higor Euripedes
+//       Johan Duparc               Thomas Fields
+//       Hou Qiming                 Derek Vinyard
+//       Rob Loach                  Cort Stratton
+//       Kenney Phillis Jr.         Brian Costabile
+//       Ken Voskuil (kaesve)
+//
+// VERSION HISTORY
+//
+//   1.24 (2020-02-05) fix warning
+//   1.23 (2020-02-02) query SVG data for glyphs; query whole kerning table (but only kern not GPOS)
+//   1.22 (2019-08-11) minimize missing-glyph duplication; fix kerning if both 'GPOS' and 'kern' are defined
+//   1.21 (2019-02-25) fix warning
+//   1.20 (2019-02-07) PackFontRange skips missing codepoints; GetScaleFontVMetrics()
+//   1.19 (2018-02-11) GPOS kerning, STBTT_fmod
+//   1.18 (2018-01-29) add missing function
+//   1.17 (2017-07-23) make more arguments const; doc fix
+//   1.16 (2017-07-12) SDF support
+//   1.15 (2017-03-03) make more arguments const
+//   1.14 (2017-01-16) num-fonts-in-TTC function
+//   1.13 (2017-01-02) support OpenType fonts, certain Apple fonts
+//   1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual
+//   1.11 (2016-04-02) fix unused-variable warning
+//   1.10 (2016-04-02) user-defined fabs(); rare memory leak; remove duplicate typedef
+//   1.09 (2016-01-16) warning fix; avoid crash on outofmem; use allocation userdata properly
+//   1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
+//   1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
+//                     variant PackFontRanges to pack and render in separate phases;
+//                     fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
+//                     fixed an assert() bug in the new rasterizer
+//                     replace assert() with STBTT_assert() in new rasterizer
+//
+//   Full history can be found at the end of this file.
+//
+// LICENSE
+//
+//   See end of file for license information.
+//
+// USAGE
+//
+//   Include this file in whatever places need to refer to it. In ONE C/C++
+//   file, write:
+//      #define STB_TRUETYPE_IMPLEMENTATION
+//   before the #include of this file. This expands out the actual
+//   implementation into that C/C++ file.
+//
+//   To make the implementation private to the file that generates the implementation,
+//      #define STBTT_STATIC
+//
+//   Simple 3D API (don't ship this, but it's fine for tools and quick start)
+//           stbtt_BakeFontBitmap()               -- bake a font to a bitmap for use as texture
+//           stbtt_GetBakedQuad()                 -- compute quad to draw for a given char
+//
+//   Improved 3D API (more shippable):
+//           #include "stb_rect_pack.h"           -- optional, but you really want it
+//           stbtt_PackBegin()
+//           stbtt_PackSetOversampling()          -- for improved quality on small fonts
+//           stbtt_PackFontRanges()               -- pack and renders
+//           stbtt_PackEnd()
+//           stbtt_GetPackedQuad()
+//
+//   "Load" a font file from a memory buffer (you have to keep the buffer loaded)
+//           stbtt_InitFont()
+//           stbtt_GetFontOffsetForIndex()        -- indexing for TTC font collections
+//           stbtt_GetNumberOfFonts()             -- number of fonts for TTC font collections
+//
+//   Render a unicode codepoint to a bitmap
+//           stbtt_GetCodepointBitmap()           -- allocates and returns a bitmap
+//           stbtt_MakeCodepointBitmap()          -- renders into bitmap you provide
+//           stbtt_GetCodepointBitmapBox()        -- how big the bitmap must be
+//
+//   Character advance/positioning
+//           stbtt_GetCodepointHMetrics()
+//           stbtt_GetFontVMetrics()
+//           stbtt_GetFontVMetricsOS2()
+//           stbtt_GetCodepointKernAdvance()
+//
+//   Starting with version 1.06, the rasterizer was replaced with a new,
+//   faster and generally-more-precise rasterizer. The new rasterizer more
+//   accurately measures pixel coverage for anti-aliasing, except in the case
+//   where multiple shapes overlap, in which case it overestimates the AA pixel
+//   coverage. Thus, anti-aliasing of intersecting shapes may look wrong. If
+//   this turns out to be a problem, you can re-enable the old rasterizer with
+//        #define STBTT_RASTERIZER_VERSION 1
+//   which will incur about a 15% speed hit.
+//
+// ADDITIONAL DOCUMENTATION
+//
+//   Immediately after this block comment are a series of sample programs.
+//
+//   After the sample programs is the "header file" section. This section
+//   includes documentation for each API function.
+//
+//   Some important concepts to understand to use this library:
+//
+//      Codepoint
+//         Characters are defined by unicode codepoints, e.g. 65 is
+//         uppercase A, 231 is lowercase c with a cedilla, 0x7e30 is
+//         the hiragana for "ma".
+//
+//      Glyph
+//         A visual character shape (every codepoint is rendered as
+//         some glyph)
+//
+//      Glyph index
+//         A font-specific integer ID representing a glyph
+//
+//      Baseline
+//         Glyph shapes are defined relative to a baseline, which is the
+//         bottom of uppercase characters. Characters extend both above
+//         and below the baseline.
+//
+//      Current Point
+//         As you draw text to the screen, you keep track of a "current point"
+//         which is the origin of each character. The current point's vertical
+//         position is the baseline. Even "baked fonts" use this model.
+//
+//      Vertical Font Metrics
+//         The vertical qualities of the font, used to vertically position
+//         and space the characters. See docs for stbtt_GetFontVMetrics.
+//
+//      Font Size in Pixels or Points
+//         The preferred interface for specifying font sizes in stb_truetype
+//         is to specify how tall the font's vertical extent should be in pixels.
+//         If that sounds good enough, skip the next paragraph.
+//
+//         Most font APIs instead use "points", which are a common typographic
+//         measurement for describing font size, defined as 72 points per inch.
+//         stb_truetype provides a point API for compatibility. However, true
+//         "per inch" conventions don't make much sense on computer displays
+//         since different monitors have different number of pixels per
+//         inch. For example, Windows traditionally uses a convention that
+//         there are 96 pixels per inch, thus making 'inch' measurements have
+//         nothing to do with inches, and thus effectively defining a point to
+//         be 1.333 pixels. Additionally, the TrueType font data provides
+//         an explicit scale factor to scale a given font's glyphs to points,
+//         but the author has observed that this scale factor is often wrong
+//         for non-commercial fonts, thus making fonts scaled in points
+//         according to the TrueType spec incoherently sized in practice.
+//
+// DETAILED USAGE:
+//
+//  Scale:
+//    Select how high you want the font to be, in points or pixels.
+//    Call ScaleForPixelHeight or ScaleForMappingEmToPixels to compute
+//    a scale factor SF that will be used by all other functions.
+//
+//  Baseline:
+//    You need to select a y-coordinate that is the baseline of where
+//    your text will appear. Call GetFontBoundingBox to get the baseline-relative
+//    bounding box for all characters. SF*-y0 will be the distance in pixels
+//    that the worst-case character could extend above the baseline, so if
+//    you want the top edge of characters to appear at the top of the
+//    screen where y=0, then you would set the baseline to SF*-y0.
+//
+//  Current point:
+//    Set the current point where the first character will appear. The
+//    first character could extend left of the current point; this is font
+//    dependent. You can either choose a current point that is the leftmost
+//    point and hope, or add some padding, or check the bounding box or
+//    left-side-bearing of the first character to be displayed and set
+//    the current point based on that.
+//
+//  Displaying a character:
+//    Compute the bounding box of the character. It will contain signed values
+//    relative to <current_point, baseline>. I.e. if it returns x0,y0,x1,y1,
+//    then the character should be displayed in the rectangle from
+//    <current_point+SF*x0, baseline+SF*y0> to <current_point+SF*x1,baseline+SF*y1).
+//
+//  Advancing for the next character:
+//    Call GlyphHMetrics, and compute 'current_point += SF * advance'.
+//
+//
+// ADVANCED USAGE
+//
+//   Quality:
+//
+//    - Use the functions with Subpixel at the end to allow your characters
+//      to have subpixel positioning. Since the font is anti-aliased, not
+//      hinted, this is very import for quality. (This is not possible with
+//      baked fonts.)
+//
+//    - Kerning is now supported, and if you're supporting subpixel rendering
+//      then kerning is worth using to give your text a polished look.
+//
+//   Performance:
+//
+//    - Convert Unicode codepoints to glyph indexes and operate on the glyphs;
+//      if you don't do this, stb_truetype is forced to do the conversion on
+//      every call.
+//
+//    - There are a lot of memory allocations. We should modify it to take
+//      a temp buffer and allocate from the temp buffer (without freeing),
+//      should help performance a lot.
+//
+// NOTES
+//
+//   The system uses the raw data found in the .ttf file without changing it
+//   and without building auxiliary data structures. This is a bit inefficient
+//   on little-endian systems (the data is big-endian), but assuming you're
+//   caching the bitmaps or glyph shapes this shouldn't be a big deal.
+//
+//   It appears to be very hard to programmatically determine what font a
+//   given file is in a general way. I provide an API for this, but I don't
+//   recommend it.
+//
+//
+// PERFORMANCE MEASUREMENTS FOR 1.06:
+//
+//                      32-bit     64-bit
+//   Previous release:  8.83 s     7.68 s
+//   Pool allocations:  7.72 s     6.34 s
+//   Inline sort     :  6.54 s     5.65 s
+//   New rasterizer  :  5.63 s     5.00 s
+
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+////
+////  SAMPLE PROGRAMS
+////
+//
+//  Incomplete text-in-3d-api example, which draws quads properly aligned to be lossless
+//
+#if 0
+#define STB_TRUETYPE_IMPLEMENTATION  // force following include to generate implementation
+#include "stb_truetype.h"
+
+unsigned char ttf_buffer[1<<20];
+unsigned char temp_bitmap[512*512];
+
+stbtt_bakedchar cdata[96]; // ASCII 32..126 is 95 glyphs
+GLuint ftex;
+
+void my_stbtt_initfont(void)
+{
+   fread(ttf_buffer, 1, 1<<20, fopen("c:/windows/fonts/times.ttf", "rb"));
+   stbtt_BakeFontBitmap(ttf_buffer,0, 32.0, temp_bitmap,512,512, 32,96, cdata); // no guarantee this fits!
+   // can free ttf_buffer at this point
+   glGenTextures(1, &ftex);
+   glBindTexture(GL_TEXTURE_2D, ftex);
+   glTexImage2D(GL_TEXTURE_2D, 0, GL_ALPHA, 512,512, 0, GL_ALPHA, GL_UNSIGNED_BYTE, temp_bitmap);
+   // can free temp_bitmap at this point
+   glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
+}
+
+void my_stbtt_print(float x, float y, char *text)
+{
+   // assume orthographic projection with units = screen pixels, origin at top left
+   glEnable(GL_TEXTURE_2D);
+   glBindTexture(GL_TEXTURE_2D, ftex);
+   glBegin(GL_QUADS);
+   while (*text) {
+      if (*text >= 32 && *text < 128) {
+         stbtt_aligned_quad q;
+         stbtt_GetBakedQuad(cdata, 512,512, *text-32, &x,&y,&q,1);//1=opengl & d3d10+,0=d3d9
+         glTexCoord2f(q.s0,q.t1); glVertex2f(q.x0,q.y0);
+         glTexCoord2f(q.s1,q.t1); glVertex2f(q.x1,q.y0);
+         glTexCoord2f(q.s1,q.t0); glVertex2f(q.x1,q.y1);
+         glTexCoord2f(q.s0,q.t0); glVertex2f(q.x0,q.y1);
+      }
+      ++text;
+   }
+   glEnd();
+}
+#endif
+//
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Complete program (this compiles): get a single bitmap, print as ASCII art
+//
+#if 0
+#include <stdio.h>
+#define STB_TRUETYPE_IMPLEMENTATION  // force following include to generate implementation
+#include "stb_truetype.h"
+
+char ttf_buffer[1<<25];
+
+int main(int argc, char **argv)
+{
+   stbtt_fontinfo font;
+   unsigned char *bitmap;
+   int w,h,i,j,c = (argc > 1 ? atoi(argv[1]) : 'a'), s = (argc > 2 ? atoi(argv[2]) : 20);
+
+   fread(ttf_buffer, 1, 1<<25, fopen(argc > 3 ? argv[3] : "c:/windows/fonts/arialbd.ttf", "rb"));
+
+   stbtt_InitFont(&font, ttf_buffer, stbtt_GetFontOffsetForIndex(ttf_buffer,0));
+   bitmap = stbtt_GetCodepointBitmap(&font, 0,stbtt_ScaleForPixelHeight(&font, s), c, &w, &h, 0,0);
+
+   for (j=0; j < h; ++j) {
+      for (i=0; i < w; ++i)
+         putchar(" .:ioVM@"[bitmap[j*w+i]>>5]);
+      putchar('\n');
+   }
+   return 0;
+}
+#endif
+//
+// Output:
+//
+//     .ii.
+//    @@@@@@.
+//   V@Mio@@o
+//   :i.  V@V
+//     :oM@@M
+//   :@@@MM@M
+//   @@o  o@M
+//  :@@.  M@M
+//   @@@o@@@@
+//   :M@@V:@@.
+//
+//////////////////////////////////////////////////////////////////////////////
+//
+// Complete program: print "Hello World!" banner, with bugs
+//
+#if 0
+char buffer[24<<20];
+unsigned char screen[20][79];
+
+int main(int arg, char **argv)
+{
+   stbtt_fontinfo font;
+   int i,j,ascent,baseline,ch=0;
+   float scale, xpos=2; // leave a little padding in case the character extends left
+   char *text = "Heljo World!"; // intentionally misspelled to show 'lj' brokenness
+
+   fread(buffer, 1, 1000000, fopen("c:/windows/fonts/arialbd.ttf", "rb"));
+   stbtt_InitFont(&font, buffer, 0);
+
+   scale = stbtt_ScaleForPixelHeight(&font, 15);
+   stbtt_GetFontVMetrics(&font, &ascent,0,0);
+   baseline = (int) (ascent*scale);
+
+   while (text[ch]) {
+      int advance,lsb,x0,y0,x1,y1;
+      float x_shift = xpos - (float) floor(xpos);
+      stbtt_GetCodepointHMetrics(&font, text[ch], &advance, &lsb);
+      stbtt_GetCodepointBitmapBoxSubpixel(&font, text[ch], scale,scale,x_shift,0, &x0,&y0,&x1,&y1);
+      stbtt_MakeCodepointBitmapSubpixel(&font, &screen[baseline + y0][(int) xpos + x0], x1-x0,y1-y0, 79, scale,scale,x_shift,0, text[ch]);
+      // note that this stomps the old data, so where character boxes overlap (e.g. 'lj') it's wrong
+      // because this API is really for baking character bitmaps into textures. if you want to render
+      // a sequence of characters, you really need to render each bitmap to a temp buffer, then
+      // "alpha blend" that into the working buffer
+      xpos += (advance * scale);
+      if (text[ch+1])
+         xpos += scale*stbtt_GetCodepointKernAdvance(&font, text[ch],text[ch+1]);
+      ++ch;
+   }
+
+   for (j=0; j < 20; ++j) {
+      for (i=0; i < 78; ++i)
+         putchar(" .:ioVM@"[screen[j][i]>>5]);
+      putchar('\n');
+   }
+
+   return 0;
+}
+#endif
+
+
+//////////////////////////////////////////////////////////////////////////////
+//////////////////////////////////////////////////////////////////////////////
+////
+////   INTEGRATION WITH YOUR CODEBASE
+////
+////   The following sections allow you to supply alternate definitions
+////   of C library functions used by stb_truetype, e.g. if you don't
+////   link with the C runtime library.
+
+#ifdef STB_TRUETYPE_IMPLEMENTATION
+   // #define your own (u)stbtt_int8/16/32 before including to override this
+   #ifndef stbtt_uint8
+   typedef unsigned char   stbtt_uint8;
+   typedef signed   char   stbtt_int8;
+   typedef unsigned short  stbtt_uint16;
+   typedef signed   short  stbtt_int16;
+   typedef unsigned int    stbtt_uint32;
+   typedef signed   int    stbtt_int32;
+   #endif
+
+   typedef char stbtt__check_size32[sizeof(stbtt_int32)==4 ? 1 : -1];
+   typedef char stbtt__check_size16[sizeof(stbtt_int16)==2 ? 1 : -1];
+
+   // e.g. #define your own STBTT_ifloor/STBTT_iceil() to avoid math.h
+   #ifndef STBTT_ifloor
+   #include <math.h>
+   #define STBTT_ifloor(x)   ((int) floor(x))
+   #define STBTT_iceil(x)    ((int) ceil(x))
+   #endif
+
+   #ifndef STBTT_sqrt
+   #include <math.h>
+   #define STBTT_sqrt(x)      sqrt(x)
+   #define STBTT_pow(x,y)     pow(x,y)
+   #endif
+
+   #ifndef STBTT_fmod
+   #include <math.h>
+   #define STBTT_fmod(x,y)    fmod(x,y)
+   #endif
+
+   #ifndef STBTT_cos
+   #include <math.h>
+   #define STBTT_cos(x)       cos(x)
+   #define STBTT_acos(x)      acos(x)
+   #endif
+
+   #ifndef STBTT_fabs
+   #include <math.h>
+   #define STBTT_fabs(x)      fabs(x)
+   #endif
+
+   // #define your own functions "STBTT_malloc" / "STBTT_free" to avoid malloc.h
+   #ifndef STBTT_malloc
+   #include <stdlib.h>
+   #define STBTT_malloc(x,u)  ((void)(u),malloc(x))
+   #define STBTT_free(x,u)    ((void)(u),free(x))
+   #endif
+
+   #ifndef STBTT_assert
+   #include <assert.h>
+   #define STBTT_assert(x)    assert(x)
+   #endif
+
+   #ifndef STBTT_strlen
+   #include <string.h>
+   #define STBTT_strlen(x)    strlen(x)
+   #endif
+
+   #ifndef STBTT_memcpy
+   #include <string.h>
+   #define STBTT_memcpy       memcpy
+   #define STBTT_memset       memset
+   #endif
+#endif
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+////
+////   INTERFACE
+////
+////
+
+#ifndef __STB_INCLUDE_STB_TRUETYPE_H__
+#define __STB_INCLUDE_STB_TRUETYPE_H__
+
+#ifdef STBTT_STATIC
+#define STBTT_DEF static
+#else
+#define STBTT_DEF extern
+#endif
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+// private structure
+typedef struct
+{
+   unsigned char *data;
+   int cursor;
+   int size;
+} stbtt__buf;
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// TEXTURE BAKING API
+//
+// If you use this API, you only have to call two functions ever.
+//
+
+typedef struct
+{
+   unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
+   float xoff,yoff,xadvance;
+} stbtt_bakedchar;
+
+STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset,  // font location (use offset=0 for plain .ttf)
+                                float pixel_height,                     // height of font in pixels
+                                unsigned char *pixels, int pw, int ph,  // bitmap to be filled in
+                                int first_char, int num_chars,          // characters to bake
+                                stbtt_bakedchar *chardata);             // you allocate this, it's num_chars long
+// if return is positive, the first unused row of the bitmap
+// if return is negative, returns the negative of the number of characters that fit
+// if return is 0, no characters fit and no rows were used
+// This uses a very crappy packing.
+
+typedef struct
+{
+   float x0,y0,s0,t0; // top-left
+   float x1,y1,s1,t1; // bottom-right
+} stbtt_aligned_quad;
+
+STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph,  // same data as above
+                               int char_index,             // character to display
+                               float *xpos, float *ypos,   // pointers to current position in screen pixel space
+                               stbtt_aligned_quad *q,      // output: quad to draw
+                               int opengl_fillrule);       // true if opengl fill rule; false if DX9 or earlier
+// Call GetBakedQuad with char_index = 'character - first_char', and it
+// creates the quad you need to draw and advances the current position.
+//
+// The coordinate system used assumes y increases downwards.
+//
+// Characters will extend both above and below the current position;
+// see discussion of "BASELINE" above.
+//
+// It's inefficient; you might want to c&p it and optimize it.
+
+STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap);
+// Query the font vertical metrics without having to create a font first.
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// NEW TEXTURE BAKING API
+//
+// This provides options for packing multiple fonts into one atlas, not
+// perfectly but better than nothing.
+
+typedef struct
+{
+   unsigned short x0,y0,x1,y1; // coordinates of bbox in bitmap
+   float xoff,yoff,xadvance;
+   float xoff2,yoff2;
+} stbtt_packedchar;
+
+typedef struct stbtt_pack_context stbtt_pack_context;
+typedef struct stbtt_fontinfo stbtt_fontinfo;
+#ifndef STB_RECT_PACK_VERSION
+typedef struct stbrp_rect stbrp_rect;
+#endif
+
+STBTT_DEF int  stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int width, int height, int stride_in_bytes, int padding, void *alloc_context);
+// Initializes a packing context stored in the passed-in stbtt_pack_context.
+// Future calls using this context will pack characters into the bitmap passed
+// in here: a 1-channel bitmap that is width * height. stride_in_bytes is
+// the distance from one row to the next (or 0 to mean they are packed tightly
+// together). "padding" is the amount of padding to leave between each
+// character (normally you want '1' for bitmaps you'll use as textures with
+// bilinear filtering).
+//
+// Returns 0 on failure, 1 on success.
+
+STBTT_DEF void stbtt_PackEnd  (stbtt_pack_context *spc);
+// Cleans up the packing context and frees all memory.
+
+#define STBTT_POINT_SIZE(x)   (-(x))
+
+STBTT_DEF int  stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, float font_size,
+                                int first_unicode_char_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range);
+// Creates character bitmaps from the font_index'th font found in fontdata (use
+// font_index=0 if you don't know what that is). It creates num_chars_in_range
+// bitmaps for characters with unicode values starting at first_unicode_char_in_range
+// and increasing. Data for how to render them is stored in chardata_for_range;
+// pass these to stbtt_GetPackedQuad to get back renderable quads.
+//
+// font_size is the full height of the character from ascender to descender,
+// as computed by stbtt_ScaleForPixelHeight. To use a point size as computed
+// by stbtt_ScaleForMappingEmToPixels, wrap the point size in STBTT_POINT_SIZE()
+// and pass that result as 'font_size':
+//       ...,                  20 , ... // font max minus min y is 20 pixels tall
+//       ..., STBTT_POINT_SIZE(20), ... // 'M' is 20 pixels tall
+
+typedef struct
+{
+   float font_size;
+   int first_unicode_codepoint_in_range;  // if non-zero, then the chars are continuous, and this is the first codepoint
+   int *array_of_unicode_codepoints;       // if non-zero, then this is an array of unicode codepoints
+   int num_chars;
+   stbtt_packedchar *chardata_for_range; // output
+   unsigned char h_oversample, v_oversample; // don't set these, they're used internally
+} stbtt_pack_range;
+
+STBTT_DEF int  stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges);
+// Creates character bitmaps from multiple ranges of characters stored in
+// ranges. This will usually create a better-packed bitmap than multiple
+// calls to stbtt_PackFontRange. Note that you can call this multiple
+// times within a single PackBegin/PackEnd.
+
+STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample);
+// Oversampling a font increases the quality by allowing higher-quality subpixel
+// positioning, and is especially valuable at smaller text sizes.
+//
+// This function sets the amount of oversampling for all following calls to
+// stbtt_PackFontRange(s) or stbtt_PackFontRangesGatherRects for a given
+// pack context. The default (no oversampling) is achieved by h_oversample=1
+// and v_oversample=1. The total number of pixels required is
+// h_oversample*v_oversample larger than the default; for example, 2x2
+// oversampling requires 4x the storage of 1x1. For best results, render
+// oversampled textures with bilinear filtering. Look at the readme in
+// stb/tests/oversample for information about oversampled fonts
+//
+// To use with PackFontRangesGather etc., you must set it before calls
+// call to PackFontRangesGatherRects.
+
+STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip);
+// If skip != 0, this tells stb_truetype to skip any codepoints for which
+// there is no corresponding glyph. If skip=0, which is the default, then
+// codepoints without a glyph recived the font's "missing character" glyph,
+// typically an empty box by convention.
+
+STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph,  // same data as above
+                               int char_index,             // character to display
+                               float *xpos, float *ypos,   // pointers to current position in screen pixel space
+                               stbtt_aligned_quad *q,      // output: quad to draw
+                               int align_to_integer);
+
+STBTT_DEF int  stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
+STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects);
+STBTT_DEF int  stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects);
+// Calling these functions in sequence is roughly equivalent to calling
+// stbtt_PackFontRanges(). If you more control over the packing of multiple
+// fonts, or if you want to pack custom data into a font texture, take a look
+// at the source to of stbtt_PackFontRanges() and create a custom version
+// using these functions, e.g. call GatherRects multiple times,
+// building up a single array of rects, then call PackRects once,
+// then call RenderIntoRects repeatedly. This may result in a
+// better packing than calling PackFontRanges multiple times
+// (or it may not).
+
+// this is an opaque structure that you shouldn't mess with which holds
+// all the context needed from PackBegin to PackEnd.
+struct stbtt_pack_context {
+   void *user_allocator_context;
+   void *pack_info;
+   int   width;
+   int   height;
+   int   stride_in_bytes;
+   int   padding;
+   int   skip_missing;
+   unsigned int   h_oversample, v_oversample;
+   unsigned char *pixels;
+   void  *nodes;
+};
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// FONT LOADING
+//
+//
+
+STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data);
+// This function will determine the number of fonts in a font file.  TrueType
+// collection (.ttc) files may contain multiple fonts, while TrueType font
+// (.ttf) files only contain one font. The number of fonts can be used for
+// indexing with the previous function where the index is between zero and one
+// less than the total fonts. If an error occurs, -1 is returned.
+
+STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index);
+// Each .ttf/.ttc file may have more than one font. Each font has a sequential
+// index number starting from 0. Call this function to get the font offset for
+// a given index; it returns -1 if the index is out of range. A regular .ttf
+// file will only define one font and it always be at offset 0, so it will
+// return '0' for index 0, and -1 for all other indices.
+
+// The following structure is defined publicly so you can declare one on
+// the stack or as a global or etc, but you should treat it as opaque.
+struct stbtt_fontinfo
+{
+   void           * userdata;
+   unsigned char  * data;              // pointer to .ttf file
+   int              fontstart;         // offset of start of font
+
+   int numGlyphs;                     // number of glyphs, needed for range checking
+
+   int loca,head,glyf,hhea,hmtx,kern,gpos,svg; // table locations as offset from start of .ttf
+   int index_map;                     // a cmap mapping for our chosen character encoding
+   int indexToLocFormat;              // format needed to map from glyph index to glyph
+
+   stbtt__buf cff;                    // cff font data
+   stbtt__buf charstrings;            // the charstring index
+   stbtt__buf gsubrs;                 // global charstring subroutines index
+   stbtt__buf subrs;                  // private charstring subroutines index
+   stbtt__buf fontdicts;              // array of font dicts
+   stbtt__buf fdselect;               // map from glyph to fontdict
+};
+
+STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset);
+// Given an offset into the file that defines a font, this function builds
+// the necessary cached info for the rest of the system. You must allocate
+// the stbtt_fontinfo yourself, and stbtt_InitFont will fill it out. You don't
+// need to do anything special to free it, because the contents are pure
+// value data with no additional data structures. Returns 0 on failure.
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// CHARACTER TO GLYPH-INDEX CONVERSIOn
+
+STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint);
+// If you're going to perform multiple operations on the same character
+// and you want a speed-up, call this function with the character you're
+// going to process, then use glyph-based functions instead of the
+// codepoint-based functions.
+// Returns 0 if the character codepoint is not defined in the font.
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// CHARACTER PROPERTIES
+//
+
+STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float pixels);
+// computes a scale factor to produce a font whose "height" is 'pixels' tall.
+// Height is measured as the distance from the highest ascender to the lowest
+// descender; in other words, it's equivalent to calling stbtt_GetFontVMetrics
+// and computing:
+//       scale = pixels / (ascent - descent)
+// so if you prefer to measure height by the ascent only, use a similar calculation.
+
+STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels);
+// computes a scale factor to produce a font whose EM size is mapped to
+// 'pixels' tall. This is probably what traditional APIs compute, but
+// I'm not positive.
+
+STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap);
+// ascent is the coordinate above the baseline the font extends; descent
+// is the coordinate below the baseline the font extends (i.e. it is typically negative)
+// lineGap is the spacing between one row's descent and the next row's ascent...
+// so you should advance the vertical position by "*ascent - *descent + *lineGap"
+//   these are expressed in unscaled coordinates, so you must multiply by
+//   the scale factor for a given size
+
+STBTT_DEF int  stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap);
+// analogous to GetFontVMetrics, but returns the "typographic" values from the OS/2
+// table (specific to MS/Windows TTF files).
+//
+// Returns 1 on success (table present), 0 on failure.
+
+STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1);
+// the bounding box around all possible characters
+
+STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing);
+// leftSideBearing is the offset from the current horizontal position to the left edge of the character
+// advanceWidth is the offset from the current horizontal position to the next horizontal position
+//   these are expressed in unscaled coordinates
+
+STBTT_DEF int  stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2);
+// an additional amount to add to the 'advance' value between ch1 and ch2
+
+STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1);
+// Gets the bounding box of the visible part of the glyph, in unscaled coordinates
+
+STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing);
+STBTT_DEF int  stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2);
+STBTT_DEF int  stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
+// as above, but takes one or more glyph indices for greater efficiency
+
+typedef struct stbtt_kerningentry
+{
+   int glyph1; // use stbtt_FindGlyphIndex
+   int glyph2;
+   int advance;
+} stbtt_kerningentry;
+
+STBTT_DEF int  stbtt_GetKerningTableLength(const stbtt_fontinfo *info);
+STBTT_DEF int  stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length);
+// Retrieves a complete list of all of the kerning pairs provided by the font
+// stbtt_GetKerningTable never writes more than table_length entries and returns how many entries it did write.
+// The table will be sorted by (a.glyph1 == b.glyph1)?(a.glyph2 < b.glyph2):(a.glyph1 < b.glyph1)
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// GLYPH SHAPES (you probably don't need these, but they have to go before
+// the bitmaps for C declaration-order reasons)
+//
+
+#ifndef STBTT_vmove // you can predefine these to use different values (but why?)
+   enum {
+      STBTT_vmove=1,
+      STBTT_vline,
+      STBTT_vcurve,
+      STBTT_vcubic
+   };
+#endif
+
+#ifndef stbtt_vertex // you can predefine this to use different values
+                   // (we share this with other code at RAD)
+   #define stbtt_vertex_type short // can't use stbtt_int16 because that's not visible in the header file
+   typedef struct
+   {
+      stbtt_vertex_type x,y,cx,cy,cx1,cy1;
+      unsigned char type,padding;
+   } stbtt_vertex;
+#endif
+
+STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index);
+// returns non-zero if nothing is drawn for this glyph
+
+STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices);
+STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **vertices);
+// returns # of vertices and fills *vertices with the pointer to them
+//   these are expressed in "unscaled" coordinates
+//
+// The shape is a series of contours. Each one starts with
+// a STBTT_moveto, then consists of a series of mixed
+// STBTT_lineto and STBTT_curveto segments. A lineto
+// draws a line from previous endpoint to its x,y; a curveto
+// draws a quadratic bezier from previous endpoint to
+// its x,y, using cx,cy as the bezier control point.
+
+STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *vertices);
+// frees the data allocated above
+
+STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg);
+STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg);
+// fills svg with the character's SVG data.
+// returns data size or 0 if SVG not found.
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// BITMAP RENDERING
+//
+
+STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata);
+// frees the bitmap allocated below
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
+// allocates a large-enough single-channel 8bpp bitmap and renders the
+// specified character/glyph at the specified scale into it, with
+// antialiasing. 0 is no coverage (transparent), 255 is fully covered (opaque).
+// *width & *height are filled out with the width & height of the bitmap,
+// which is stored left-to-right, top-to-bottom.
+//
+// xoff/yoff are the offset it pixel space from the glyph origin to the top-left of the bitmap
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff);
+// the same as stbtt_GetCodepoitnBitmap, but you can specify a subpixel
+// shift for the character
+
+STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint);
+// the same as stbtt_GetCodepointBitmap, but you pass in storage for the bitmap
+// in the form of 'output', with row spacing of 'out_stride' bytes. the bitmap
+// is clipped to out_w/out_h bytes. Call stbtt_GetCodepointBitmapBox to get the
+// width and height and positioning info for it first.
+
+STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint);
+// same as stbtt_MakeCodepointBitmap, but you can specify a subpixel
+// shift for the character
+
+STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint);
+// same as stbtt_MakeCodepointBitmapSubpixel, but prefiltering
+// is performed (see stbtt_PackSetOversampling)
+
+STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
+// get the bbox of the bitmap centered around the glyph origin; so the
+// bitmap width is ix1-ix0, height is iy1-iy0, and location to place
+// the bitmap top left is (leftSideBearing*scale,iy0).
+// (Note that the bitmap uses y-increases-down, but the shape uses
+// y-increases-up, so CodepointBitmapBox and CodepointBox are inverted.)
+
+STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
+// same as stbtt_GetCodepointBitmapBox, but you can specify a subpixel
+// shift for the character
+
+// the following functions are equivalent to the above functions, but operate
+// on glyph indices instead of Unicode codepoints (for efficiency)
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff);
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff);
+STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph);
+STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph);
+STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int glyph);
+STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1);
+STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1);
+
+
+// @TODO: don't expose this structure
+typedef struct
+{
+   int w,h,stride;
+   unsigned char *pixels;
+} stbtt__bitmap;
+
+// rasterize a shape with quadratic beziers into a bitmap
+STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result,        // 1-channel bitmap to draw into
+                               float flatness_in_pixels,     // allowable error of curve in pixels
+                               stbtt_vertex *vertices,       // array of vertices defining shape
+                               int num_verts,                // number of vertices in above array
+                               float scale_x, float scale_y, // scale applied to input vertices
+                               float shift_x, float shift_y, // translation applied to input vertices
+                               int x_off, int y_off,         // another translation applied to input
+                               int invert,                   // if non-zero, vertically flip shape
+                               void *userdata);              // context for to STBTT_MALLOC
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Signed Distance Function (or Field) rendering
+
+STBTT_DEF void stbtt_FreeSDF(unsigned char *bitmap, void *userdata);
+// frees the SDF bitmap allocated below
+
+STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float scale, int glyph, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff);
+STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff);
+// These functions compute a discretized SDF field for a single character, suitable for storing
+// in a single-channel texture, sampling with bilinear filtering, and testing against
+// larger than some threshold to produce scalable fonts.
+//        info              --  the font
+//        scale             --  controls the size of the resulting SDF bitmap, same as it would be creating a regular bitmap
+//        glyph/codepoint   --  the character to generate the SDF for
+//        padding           --  extra "pixels" around the character which are filled with the distance to the character (not 0),
+//                                 which allows effects like bit outlines
+//        onedge_value      --  value 0-255 to test the SDF against to reconstruct the character (i.e. the isocontour of the character)
+//        pixel_dist_scale  --  what value the SDF should increase by when moving one SDF "pixel" away from the edge (on the 0..255 scale)
+//                                 if positive, > onedge_value is inside; if negative, < onedge_value is inside
+//        width,height      --  output height & width of the SDF bitmap (including padding)
+//        xoff,yoff         --  output origin of the character
+//        return value      --  a 2D array of bytes 0..255, width*height in size
+//
+// pixel_dist_scale & onedge_value are a scale & bias that allows you to make
+// optimal use of the limited 0..255 for your application, trading off precision
+// and special effects. SDF values outside the range 0..255 are clamped to 0..255.
+//
+// Example:
+//      scale = stbtt_ScaleForPixelHeight(22)
+//      padding = 5
+//      onedge_value = 180
+//      pixel_dist_scale = 180/5.0 = 36.0
+//
+//      This will create an SDF bitmap in which the character is about 22 pixels
+//      high but the whole bitmap is about 22+5+5=32 pixels high. To produce a filled
+//      shape, sample the SDF at each pixel and fill the pixel if the SDF value
+//      is greater than or equal to 180/255. (You'll actually want to antialias,
+//      which is beyond the scope of this example.) Additionally, you can compute
+//      offset outlines (e.g. to stroke the character border inside & outside,
+//      or only outside). For example, to fill outside the character up to 3 SDF
+//      pixels, you would compare against (180-36.0*3)/255 = 72/255. The above
+//      choice of variables maps a range from 5 pixels outside the shape to
+//      2 pixels inside the shape to 0..255; this is intended primarily for apply
+//      outside effects only (the interior range is needed to allow proper
+//      antialiasing of the font at *smaller* sizes)
+//
+// The function computes the SDF analytically at each SDF pixel, not by e.g.
+// building a higher-res bitmap and approximating it. In theory the quality
+// should be as high as possible for an SDF of this size & representation, but
+// unclear if this is true in practice (perhaps building a higher-res bitmap
+// and computing from that can allow drop-out prevention).
+//
+// The algorithm has not been optimized at all, so expect it to be slow
+// if computing lots of characters or very large sizes.
+
+
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// Finding the right font...
+//
+// You should really just solve this offline, keep your own tables
+// of what font is what, and don't try to get it out of the .ttf file.
+// That's because getting it out of the .ttf file is really hard, because
+// the names in the file can appear in many possible encodings, in many
+// possible languages, and e.g. if you need a case-insensitive comparison,
+// the details of that depend on the encoding & language in a complex way
+// (actually underspecified in truetype, but also gigantic).
+//
+// But you can use the provided functions in two possible ways:
+//     stbtt_FindMatchingFont() will use *case-sensitive* comparisons on
+//             unicode-encoded names to try to find the font you want;
+//             you can run this before calling stbtt_InitFont()
+//
+//     stbtt_GetFontNameString() lets you get any of the various strings
+//             from the file yourself and do your own comparisons on them.
+//             You have to have called stbtt_InitFont() first.
+
+
+STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags);
+// returns the offset (not index) of the font that matches, or -1 if none
+//   if you use STBTT_MACSTYLE_DONTCARE, use a font name like "Arial Bold".
+//   if you use any other flag, use a font name like "Arial"; this checks
+//     the 'macStyle' header field; i don't know if fonts set this consistently
+#define STBTT_MACSTYLE_DONTCARE     0
+#define STBTT_MACSTYLE_BOLD         1
+#define STBTT_MACSTYLE_ITALIC       2
+#define STBTT_MACSTYLE_UNDERSCORE   4
+#define STBTT_MACSTYLE_NONE         8   // <= not same as 0, this makes us check the bitfield is 0
+
+STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2);
+// returns 1/0 whether the first string interpreted as utf8 is identical to
+// the second string interpreted as big-endian utf16... useful for strings from next func
+
+STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID);
+// returns the string (which may be big-endian double byte, e.g. for unicode)
+// and puts the length in bytes in *length.
+//
+// some of the values for the IDs are below; for more see the truetype spec:
+//     http://developer.apple.com/textfonts/TTRefMan/RM06/Chap6name.html
+//     http://www.microsoft.com/typography/otspec/name.htm
+
+enum { // platformID
+   STBTT_PLATFORM_ID_UNICODE   =0,
+   STBTT_PLATFORM_ID_MAC       =1,
+   STBTT_PLATFORM_ID_ISO       =2,
+   STBTT_PLATFORM_ID_MICROSOFT =3
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_UNICODE
+   STBTT_UNICODE_EID_UNICODE_1_0    =0,
+   STBTT_UNICODE_EID_UNICODE_1_1    =1,
+   STBTT_UNICODE_EID_ISO_10646      =2,
+   STBTT_UNICODE_EID_UNICODE_2_0_BMP=3,
+   STBTT_UNICODE_EID_UNICODE_2_0_FULL=4
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_MICROSOFT
+   STBTT_MS_EID_SYMBOL        =0,
+   STBTT_MS_EID_UNICODE_BMP   =1,
+   STBTT_MS_EID_SHIFTJIS      =2,
+   STBTT_MS_EID_UNICODE_FULL  =10
+};
+
+enum { // encodingID for STBTT_PLATFORM_ID_MAC; same as Script Manager codes
+   STBTT_MAC_EID_ROMAN        =0,   STBTT_MAC_EID_ARABIC       =4,
+   STBTT_MAC_EID_JAPANESE     =1,   STBTT_MAC_EID_HEBREW       =5,
+   STBTT_MAC_EID_CHINESE_TRAD =2,   STBTT_MAC_EID_GREEK        =6,
+   STBTT_MAC_EID_KOREAN       =3,   STBTT_MAC_EID_RUSSIAN      =7
+};
+
+enum { // languageID for STBTT_PLATFORM_ID_MICROSOFT; same as LCID...
+       // problematic because there are e.g. 16 english LCIDs and 16 arabic LCIDs
+   STBTT_MS_LANG_ENGLISH     =0x0409,   STBTT_MS_LANG_ITALIAN     =0x0410,
+   STBTT_MS_LANG_CHINESE     =0x0804,   STBTT_MS_LANG_JAPANESE    =0x0411,
+   STBTT_MS_LANG_DUTCH       =0x0413,   STBTT_MS_LANG_KOREAN      =0x0412,
+   STBTT_MS_LANG_FRENCH      =0x040c,   STBTT_MS_LANG_RUSSIAN     =0x0419,
+   STBTT_MS_LANG_GERMAN      =0x0407,   STBTT_MS_LANG_SPANISH     =0x0409,
+   STBTT_MS_LANG_HEBREW      =0x040d,   STBTT_MS_LANG_SWEDISH     =0x041D
+};
+
+enum { // languageID for STBTT_PLATFORM_ID_MAC
+   STBTT_MAC_LANG_ENGLISH      =0 ,   STBTT_MAC_LANG_JAPANESE     =11,
+   STBTT_MAC_LANG_ARABIC       =12,   STBTT_MAC_LANG_KOREAN       =23,
+   STBTT_MAC_LANG_DUTCH        =4 ,   STBTT_MAC_LANG_RUSSIAN      =32,
+   STBTT_MAC_LANG_FRENCH       =1 ,   STBTT_MAC_LANG_SPANISH      =6 ,
+   STBTT_MAC_LANG_GERMAN       =2 ,   STBTT_MAC_LANG_SWEDISH      =5 ,
+   STBTT_MAC_LANG_HEBREW       =10,   STBTT_MAC_LANG_CHINESE_SIMPLIFIED =33,
+   STBTT_MAC_LANG_ITALIAN      =3 ,   STBTT_MAC_LANG_CHINESE_TRAD =19
+};
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif // __STB_INCLUDE_STB_TRUETYPE_H__
+
+///////////////////////////////////////////////////////////////////////////////
+///////////////////////////////////////////////////////////////////////////////
+////
+////   IMPLEMENTATION
+////
+////
+
+#ifdef STB_TRUETYPE_IMPLEMENTATION
+
+#ifndef STBTT_MAX_OVERSAMPLE
+#define STBTT_MAX_OVERSAMPLE   8
+#endif
+
+#if STBTT_MAX_OVERSAMPLE > 255
+#error "STBTT_MAX_OVERSAMPLE cannot be > 255"
+#endif
+
+typedef int stbtt__test_oversample_pow2[(STBTT_MAX_OVERSAMPLE & (STBTT_MAX_OVERSAMPLE-1)) == 0 ? 1 : -1];
+
+#ifndef STBTT_RASTERIZER_VERSION
+#define STBTT_RASTERIZER_VERSION 2
+#endif
+
+#ifdef _MSC_VER
+#define STBTT__NOTUSED(v)  (void)(v)
+#else
+#define STBTT__NOTUSED(v)  (void)sizeof(v)
+#endif
+
+//////////////////////////////////////////////////////////////////////////
+//
+// stbtt__buf helpers to parse data from file
+//
+
+static stbtt_uint8 stbtt__buf_get8(stbtt__buf *b)
+{
+   if (b->cursor >= b->size)
+      return 0;
+   return b->data[b->cursor++];
+}
+
+static stbtt_uint8 stbtt__buf_peek8(stbtt__buf *b)
+{
+   if (b->cursor >= b->size)
+      return 0;
+   return b->data[b->cursor];
+}
+
+static void stbtt__buf_seek(stbtt__buf *b, int o)
+{
+   STBTT_assert(!(o > b->size || o < 0));
+   b->cursor = (o > b->size || o < 0) ? b->size : o;
+}
+
+static void stbtt__buf_skip(stbtt__buf *b, int o)
+{
+   stbtt__buf_seek(b, b->cursor + o);
+}
+
+static stbtt_uint32 stbtt__buf_get(stbtt__buf *b, int n)
+{
+   stbtt_uint32 v = 0;
+   int i;
+   STBTT_assert(n >= 1 && n <= 4);
+   for (i = 0; i < n; i++)
+      v = (v << 8) | stbtt__buf_get8(b);
+   return v;
+}
+
+static stbtt__buf stbtt__new_buf(const void *p, size_t size)
+{
+   stbtt__buf r;
+   STBTT_assert(size < 0x40000000);
+   r.data = (stbtt_uint8*) p;
+   r.size = (int) size;
+   r.cursor = 0;
+   return r;
+}
+
+#define stbtt__buf_get16(b)  stbtt__buf_get((b), 2)
+#define stbtt__buf_get32(b)  stbtt__buf_get((b), 4)
+
+static stbtt__buf stbtt__buf_range(const stbtt__buf *b, int o, int s)
+{
+   stbtt__buf r = stbtt__new_buf(NULL, 0);
+   if (o < 0 || s < 0 || o > b->size || s > b->size - o) return r;
+   r.data = b->data + o;
+   r.size = s;
+   return r;
+}
+
+static stbtt__buf stbtt__cff_get_index(stbtt__buf *b)
+{
+   int count, start, offsize;
+   start = b->cursor;
+   count = stbtt__buf_get16(b);
+   if (count) {
+      offsize = stbtt__buf_get8(b);
+      STBTT_assert(offsize >= 1 && offsize <= 4);
+      stbtt__buf_skip(b, offsize * count);
+      stbtt__buf_skip(b, stbtt__buf_get(b, offsize) - 1);
+   }
+   return stbtt__buf_range(b, start, b->cursor - start);
+}
+
+static stbtt_uint32 stbtt__cff_int(stbtt__buf *b)
+{
+   int b0 = stbtt__buf_get8(b);
+   if (b0 >= 32 && b0 <= 246)       return b0 - 139;
+   else if (b0 >= 247 && b0 <= 250) return (b0 - 247)*256 + stbtt__buf_get8(b) + 108;
+   else if (b0 >= 251 && b0 <= 254) return -(b0 - 251)*256 - stbtt__buf_get8(b) - 108;
+   else if (b0 == 28)               return stbtt__buf_get16(b);
+   else if (b0 == 29)               return stbtt__buf_get32(b);
+   STBTT_assert(0);
+   return 0;
+}
+
+static void stbtt__cff_skip_operand(stbtt__buf *b) {
+   int v, b0 = stbtt__buf_peek8(b);
+   STBTT_assert(b0 >= 28);
+   if (b0 == 30) {
+      stbtt__buf_skip(b, 1);
+      while (b->cursor < b->size) {
+         v = stbtt__buf_get8(b);
+         if ((v & 0xF) == 0xF || (v >> 4) == 0xF)
+            break;
+      }
+   } else {
+      stbtt__cff_int(b);
+   }
+}
+
+static stbtt__buf stbtt__dict_get(stbtt__buf *b, int key)
+{
+   stbtt__buf_seek(b, 0);
+   while (b->cursor < b->size) {
+      int start = b->cursor, end, op;
+      while (stbtt__buf_peek8(b) >= 28)
+         stbtt__cff_skip_operand(b);
+      end = b->cursor;
+      op = stbtt__buf_get8(b);
+      if (op == 12)  op = stbtt__buf_get8(b) | 0x100;
+      if (op == key) return stbtt__buf_range(b, start, end-start);
+   }
+   return stbtt__buf_range(b, 0, 0);
+}
+
+static void stbtt__dict_get_ints(stbtt__buf *b, int key, int outcount, stbtt_uint32 *out)
+{
+   int i;
+   stbtt__buf operands = stbtt__dict_get(b, key);
+   for (i = 0; i < outcount && operands.cursor < operands.size; i++)
+      out[i] = stbtt__cff_int(&operands);
+}
+
+static int stbtt__cff_index_count(stbtt__buf *b)
+{
+   stbtt__buf_seek(b, 0);
+   return stbtt__buf_get16(b);
+}
+
+static stbtt__buf stbtt__cff_index_get(stbtt__buf b, int i)
+{
+   int count, offsize, start, end;
+   stbtt__buf_seek(&b, 0);
+   count = stbtt__buf_get16(&b);
+   offsize = stbtt__buf_get8(&b);
+   STBTT_assert(i >= 0 && i < count);
+   STBTT_assert(offsize >= 1 && offsize <= 4);
+   stbtt__buf_skip(&b, i*offsize);
+   start = stbtt__buf_get(&b, offsize);
+   end = stbtt__buf_get(&b, offsize);
+   return stbtt__buf_range(&b, 2+(count+1)*offsize+start, end - start);
+}
+
+//////////////////////////////////////////////////////////////////////////
+//
+// accessors to parse data from file
+//
+
+// on platforms that don't allow misaligned reads, if we want to allow
+// truetype fonts that aren't padded to alignment, define ALLOW_UNALIGNED_TRUETYPE
+
+#define ttBYTE(p)     (* (stbtt_uint8 *) (p))
+#define ttCHAR(p)     (* (stbtt_int8 *) (p))
+#define ttFixed(p)    ttLONG(p)
+
+static stbtt_uint16 ttUSHORT(stbtt_uint8 *p) { return p[0]*256 + p[1]; }
+static stbtt_int16 ttSHORT(stbtt_uint8 *p)   { return p[0]*256 + p[1]; }
+static stbtt_uint32 ttULONG(stbtt_uint8 *p)  { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
+static stbtt_int32 ttLONG(stbtt_uint8 *p)    { return (p[0]<<24) + (p[1]<<16) + (p[2]<<8) + p[3]; }
+
+#define stbtt_tag4(p,c0,c1,c2,c3) ((p)[0] == (c0) && (p)[1] == (c1) && (p)[2] == (c2) && (p)[3] == (c3))
+#define stbtt_tag(p,str)           stbtt_tag4(p,str[0],str[1],str[2],str[3])
+
+static int stbtt__isfont(stbtt_uint8 *font)
+{
+   // check the version number
+   if (stbtt_tag4(font, '1',0,0,0))  return 1; // TrueType 1
+   if (stbtt_tag(font, "typ1"))   return 1; // TrueType with type 1 font -- we don't support this!
+   if (stbtt_tag(font, "OTTO"))   return 1; // OpenType with CFF
+   if (stbtt_tag4(font, 0,1,0,0)) return 1; // OpenType 1.0
+   if (stbtt_tag(font, "true"))   return 1; // Apple specification for TrueType fonts
+   return 0;
+}
+
+// @OPTIMIZE: binary search
+static stbtt_uint32 stbtt__find_table(stbtt_uint8 *data, stbtt_uint32 fontstart, const char *tag)
+{
+   stbtt_int32 num_tables = ttUSHORT(data+fontstart+4);
+   stbtt_uint32 tabledir = fontstart + 12;
+   stbtt_int32 i;
+   for (i=0; i < num_tables; ++i) {
+      stbtt_uint32 loc = tabledir + 16*i;
+      if (stbtt_tag(data+loc+0, tag))
+         return ttULONG(data+loc+8);
+   }
+   return 0;
+}
+
+static int stbtt_GetFontOffsetForIndex_internal(unsigned char *font_collection, int index)
+{
+   // if it's just a font, there's only one valid index
+   if (stbtt__isfont(font_collection))
+      return index == 0 ? 0 : -1;
+
+   // check if it's a TTC
+   if (stbtt_tag(font_collection, "ttcf")) {
+      // version 1?
+      if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
+         stbtt_int32 n = ttLONG(font_collection+8);
+         if (index >= n)
+            return -1;
+         return ttULONG(font_collection+12+index*4);
+      }
+   }
+   return -1;
+}
+
+static int stbtt_GetNumberOfFonts_internal(unsigned char *font_collection)
+{
+   // if it's just a font, there's only one valid font
+   if (stbtt__isfont(font_collection))
+      return 1;
+
+   // check if it's a TTC
+   if (stbtt_tag(font_collection, "ttcf")) {
+      // version 1?
+      if (ttULONG(font_collection+4) == 0x00010000 || ttULONG(font_collection+4) == 0x00020000) {
+         return ttLONG(font_collection+8);
+      }
+   }
+   return 0;
+}
+
+static stbtt__buf stbtt__get_subrs(stbtt__buf cff, stbtt__buf fontdict)
+{
+   stbtt_uint32 subrsoff = 0, private_loc[2] = { 0, 0 };
+   stbtt__buf pdict;
+   stbtt__dict_get_ints(&fontdict, 18, 2, private_loc);
+   if (!private_loc[1] || !private_loc[0]) return stbtt__new_buf(NULL, 0);
+   pdict = stbtt__buf_range(&cff, private_loc[1], private_loc[0]);
+   stbtt__dict_get_ints(&pdict, 19, 1, &subrsoff);
+   if (!subrsoff) return stbtt__new_buf(NULL, 0);
+   stbtt__buf_seek(&cff, private_loc[1]+subrsoff);
+   return stbtt__cff_get_index(&cff);
+}
+
+// since most people won't use this, find this table the first time it's needed
+static int stbtt__get_svg(stbtt_fontinfo *info)
+{
+   stbtt_uint32 t;
+   if (info->svg < 0) {
+      t = stbtt__find_table(info->data, info->fontstart, "SVG ");
+      if (t) {
+         stbtt_uint32 offset = ttULONG(info->data + t + 2);
+         info->svg = t + offset;
+      } else {
+         info->svg = 0;
+      }
+   }
+   return info->svg;
+}
+
+static int stbtt_InitFont_internal(stbtt_fontinfo *info, unsigned char *data, int fontstart)
+{
+   stbtt_uint32 cmap, t;
+   stbtt_int32 i,numTables;
+
+   info->data = data;
+   info->fontstart = fontstart;
+   info->cff = stbtt__new_buf(NULL, 0);
+
+   cmap = stbtt__find_table(data, fontstart, "cmap");       // required
+   info->loca = stbtt__find_table(data, fontstart, "loca"); // required
+   info->head = stbtt__find_table(data, fontstart, "head"); // required
+   info->glyf = stbtt__find_table(data, fontstart, "glyf"); // required
+   info->hhea = stbtt__find_table(data, fontstart, "hhea"); // required
+   info->hmtx = stbtt__find_table(data, fontstart, "hmtx"); // required
+   info->kern = stbtt__find_table(data, fontstart, "kern"); // not required
+   info->gpos = stbtt__find_table(data, fontstart, "GPOS"); // not required
+
+   if (!cmap || !info->head || !info->hhea || !info->hmtx)
+      return 0;
+   if (info->glyf) {
+      // required for truetype
+      if (!info->loca) return 0;
+   } else {
+      // initialization for CFF / Type2 fonts (OTF)
+      stbtt__buf b, topdict, topdictidx;
+      stbtt_uint32 cstype = 2, charstrings = 0, fdarrayoff = 0, fdselectoff = 0;
+      stbtt_uint32 cff;
+
+      cff = stbtt__find_table(data, fontstart, "CFF ");
+      if (!cff) return 0;
+
+      info->fontdicts = stbtt__new_buf(NULL, 0);
+      info->fdselect = stbtt__new_buf(NULL, 0);
+
+      // @TODO this should use size from table (not 512MB)
+      info->cff = stbtt__new_buf(data+cff, 512*1024*1024);
+      b = info->cff;
+
+      // read the header
+      stbtt__buf_skip(&b, 2);
+      stbtt__buf_seek(&b, stbtt__buf_get8(&b)); // hdrsize
+
+      // @TODO the name INDEX could list multiple fonts,
+      // but we just use the first one.
+      stbtt__cff_get_index(&b);  // name INDEX
+      topdictidx = stbtt__cff_get_index(&b);
+      topdict = stbtt__cff_index_get(topdictidx, 0);
+      stbtt__cff_get_index(&b);  // string INDEX
+      info->gsubrs = stbtt__cff_get_index(&b);
+
+      stbtt__dict_get_ints(&topdict, 17, 1, &charstrings);
+      stbtt__dict_get_ints(&topdict, 0x100 | 6, 1, &cstype);
+      stbtt__dict_get_ints(&topdict, 0x100 | 36, 1, &fdarrayoff);
+      stbtt__dict_get_ints(&topdict, 0x100 | 37, 1, &fdselectoff);
+      info->subrs = stbtt__get_subrs(b, topdict);
+
+      // we only support Type 2 charstrings
+      if (cstype != 2) return 0;
+      if (charstrings == 0) return 0;
+
+      if (fdarrayoff) {
+         // looks like a CID font
+         if (!fdselectoff) return 0;
+         stbtt__buf_seek(&b, fdarrayoff);
+         info->fontdicts = stbtt__cff_get_index(&b);
+         info->fdselect = stbtt__buf_range(&b, fdselectoff, b.size-fdselectoff);
+      }
+
+      stbtt__buf_seek(&b, charstrings);
+      info->charstrings = stbtt__cff_get_index(&b);
+   }
+
+   t = stbtt__find_table(data, fontstart, "maxp");
+   if (t)
+      info->numGlyphs = ttUSHORT(data+t+4);
+   else
+      info->numGlyphs = 0xffff;
+
+   info->svg = -1;
+
+   // find a cmap encoding table we understand *now* to avoid searching
+   // later. (todo: could make this installable)
+   // the same regardless of glyph.
+   numTables = ttUSHORT(data + cmap + 2);
+   info->index_map = 0;
+   for (i=0; i < numTables; ++i) {
+      stbtt_uint32 encoding_record = cmap + 4 + 8 * i;
+      // find an encoding we understand:
+      switch(ttUSHORT(data+encoding_record)) {
+         case STBTT_PLATFORM_ID_MICROSOFT:
+            switch (ttUSHORT(data+encoding_record+2)) {
+               case STBTT_MS_EID_UNICODE_BMP:
+               case STBTT_MS_EID_UNICODE_FULL:
+                  // MS/Unicode
+                  info->index_map = cmap + ttULONG(data+encoding_record+4);
+                  break;
+            }
+            break;
+        case STBTT_PLATFORM_ID_UNICODE:
+            // Mac/iOS has these
+            // all the encodingIDs are unicode, so we don't bother to check it
+            info->index_map = cmap + ttULONG(data+encoding_record+4);
+            break;
+      }
+   }
+   if (info->index_map == 0)
+      return 0;
+
+   info->indexToLocFormat = ttUSHORT(data+info->head + 50);
+   return 1;
+}
+
+STBTT_DEF int stbtt_FindGlyphIndex(const stbtt_fontinfo *info, int unicode_codepoint)
+{
+   stbtt_uint8 *data = info->data;
+   stbtt_uint32 index_map = info->index_map;
+
+   stbtt_uint16 format = ttUSHORT(data + index_map + 0);
+   if (format == 0) { // apple byte encoding
+      stbtt_int32 bytes = ttUSHORT(data + index_map + 2);
+      if (unicode_codepoint < bytes-6)
+         return ttBYTE(data + index_map + 6 + unicode_codepoint);
+      return 0;
+   } else if (format == 6) {
+      stbtt_uint32 first = ttUSHORT(data + index_map + 6);
+      stbtt_uint32 count = ttUSHORT(data + index_map + 8);
+      if ((stbtt_uint32) unicode_codepoint >= first && (stbtt_uint32) unicode_codepoint < first+count)
+         return ttUSHORT(data + index_map + 10 + (unicode_codepoint - first)*2);
+      return 0;
+   } else if (format == 2) {
+      STBTT_assert(0); // @TODO: high-byte mapping for japanese/chinese/korean
+      return 0;
+   } else if (format == 4) { // standard mapping for windows fonts: binary search collection of ranges
+      stbtt_uint16 segcount = ttUSHORT(data+index_map+6) >> 1;
+      stbtt_uint16 searchRange = ttUSHORT(data+index_map+8) >> 1;
+      stbtt_uint16 entrySelector = ttUSHORT(data+index_map+10);
+      stbtt_uint16 rangeShift = ttUSHORT(data+index_map+12) >> 1;
+
+      // do a binary search of the segments
+      stbtt_uint32 endCount = index_map + 14;
+      stbtt_uint32 search = endCount;
+
+      if (unicode_codepoint > 0xffff)
+         return 0;
+
+      // they lie from endCount .. endCount + segCount
+      // but searchRange is the nearest power of two, so...
+      if (unicode_codepoint >= ttUSHORT(data + search + rangeShift*2))
+         search += rangeShift*2;
+
+      // now decrement to bias correctly to find smallest
+      search -= 2;
+      while (entrySelector) {
+         stbtt_uint16 end;
+         searchRange >>= 1;
+         end = ttUSHORT(data + search + searchRange*2);
+         if (unicode_codepoint > end)
+            search += searchRange*2;
+         --entrySelector;
+      }
+      search += 2;
+
+      {
+         stbtt_uint16 offset, start;
+         stbtt_uint16 item = (stbtt_uint16) ((search - endCount) >> 1);
+
+         STBTT_assert(unicode_codepoint <= ttUSHORT(data + endCount + 2*item));
+         start = ttUSHORT(data + index_map + 14 + segcount*2 + 2 + 2*item);
+         if (unicode_codepoint < start)
+            return 0;
+
+         offset = ttUSHORT(data + index_map + 14 + segcount*6 + 2 + 2*item);
+         if (offset == 0)
+            return (stbtt_uint16) (unicode_codepoint + ttSHORT(data + index_map + 14 + segcount*4 + 2 + 2*item));
+
+         return ttUSHORT(data + offset + (unicode_codepoint-start)*2 + index_map + 14 + segcount*6 + 2 + 2*item);
+      }
+   } else if (format == 12 || format == 13) {
+      stbtt_uint32 ngroups = ttULONG(data+index_map+12);
+      stbtt_int32 low,high;
+      low = 0; high = (stbtt_int32)ngroups;
+      // Binary search the right group.
+      while (low < high) {
+         stbtt_int32 mid = low + ((high-low) >> 1); // rounds down, so low <= mid < high
+         stbtt_uint32 start_char = ttULONG(data+index_map+16+mid*12);
+         stbtt_uint32 end_char = ttULONG(data+index_map+16+mid*12+4);
+         if ((stbtt_uint32) unicode_codepoint < start_char)
+            high = mid;
+         else if ((stbtt_uint32) unicode_codepoint > end_char)
+            low = mid+1;
+         else {
+            stbtt_uint32 start_glyph = ttULONG(data+index_map+16+mid*12+8);
+            if (format == 12)
+               return start_glyph + unicode_codepoint-start_char;
+            else // format == 13
+               return start_glyph;
+         }
+      }
+      return 0; // not found
+   }
+   // @TODO
+   STBTT_assert(0);
+   return 0;
+}
+
+STBTT_DEF int stbtt_GetCodepointShape(const stbtt_fontinfo *info, int unicode_codepoint, stbtt_vertex **vertices)
+{
+   return stbtt_GetGlyphShape(info, stbtt_FindGlyphIndex(info, unicode_codepoint), vertices);
+}
+
+static void stbtt_setvertex(stbtt_vertex *v, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy)
+{
+   v->type = type;
+   v->x = (stbtt_int16) x;
+   v->y = (stbtt_int16) y;
+   v->cx = (stbtt_int16) cx;
+   v->cy = (stbtt_int16) cy;
+}
+
+static int stbtt__GetGlyfOffset(const stbtt_fontinfo *info, int glyph_index)
+{
+   int g1,g2;
+
+   STBTT_assert(!info->cff.size);
+
+   if (glyph_index >= info->numGlyphs) return -1; // glyph index out of range
+   if (info->indexToLocFormat >= 2)    return -1; // unknown index->glyph map format
+
+   if (info->indexToLocFormat == 0) {
+      g1 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2) * 2;
+      g2 = info->glyf + ttUSHORT(info->data + info->loca + glyph_index * 2 + 2) * 2;
+   } else {
+      g1 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4);
+      g2 = info->glyf + ttULONG (info->data + info->loca + glyph_index * 4 + 4);
+   }
+
+   return g1==g2 ? -1 : g1; // if length is 0, return -1
+}
+
+static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1);
+
+STBTT_DEF int stbtt_GetGlyphBox(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
+{
+   if (info->cff.size) {
+      stbtt__GetGlyphInfoT2(info, glyph_index, x0, y0, x1, y1);
+   } else {
+      int g = stbtt__GetGlyfOffset(info, glyph_index);
+      if (g < 0) return 0;
+
+      if (x0) *x0 = ttSHORT(info->data + g + 2);
+      if (y0) *y0 = ttSHORT(info->data + g + 4);
+      if (x1) *x1 = ttSHORT(info->data + g + 6);
+      if (y1) *y1 = ttSHORT(info->data + g + 8);
+   }
+   return 1;
+}
+
+STBTT_DEF int stbtt_GetCodepointBox(const stbtt_fontinfo *info, int codepoint, int *x0, int *y0, int *x1, int *y1)
+{
+   return stbtt_GetGlyphBox(info, stbtt_FindGlyphIndex(info,codepoint), x0,y0,x1,y1);
+}
+
+STBTT_DEF int stbtt_IsGlyphEmpty(const stbtt_fontinfo *info, int glyph_index)
+{
+   stbtt_int16 numberOfContours;
+   int g;
+   if (info->cff.size)
+      return stbtt__GetGlyphInfoT2(info, glyph_index, NULL, NULL, NULL, NULL) == 0;
+   g = stbtt__GetGlyfOffset(info, glyph_index);
+   if (g < 0) return 1;
+   numberOfContours = ttSHORT(info->data + g);
+   return numberOfContours == 0;
+}
+
+static int stbtt__close_shape(stbtt_vertex *vertices, int num_vertices, int was_off, int start_off,
+    stbtt_int32 sx, stbtt_int32 sy, stbtt_int32 scx, stbtt_int32 scy, stbtt_int32 cx, stbtt_int32 cy)
+{
+   if (start_off) {
+      if (was_off)
+         stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+scx)>>1, (cy+scy)>>1, cx,cy);
+      stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, sx,sy,scx,scy);
+   } else {
+      if (was_off)
+         stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve,sx,sy,cx,cy);
+      else
+         stbtt_setvertex(&vertices[num_vertices++], STBTT_vline,sx,sy,0,0);
+   }
+   return num_vertices;
+}
+
+static int stbtt__GetGlyphShapeTT(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
+{
+   stbtt_int16 numberOfContours;
+   stbtt_uint8 *endPtsOfContours;
+   stbtt_uint8 *data = info->data;
+   stbtt_vertex *vertices=0;
+   int num_vertices=0;
+   int g = stbtt__GetGlyfOffset(info, glyph_index);
+
+   *pvertices = NULL;
+
+   if (g < 0) return 0;
+
+   numberOfContours = ttSHORT(data + g);
+
+   if (numberOfContours > 0) {
+      stbtt_uint8 flags=0,flagcount;
+      stbtt_int32 ins, i,j=0,m,n, next_move, was_off=0, off, start_off=0;
+      stbtt_int32 x,y,cx,cy,sx,sy, scx,scy;
+      stbtt_uint8 *points;
+      endPtsOfContours = (data + g + 10);
+      ins = ttUSHORT(data + g + 10 + numberOfContours * 2);
+      points = data + g + 10 + numberOfContours * 2 + 2 + ins;
+
+      n = 1+ttUSHORT(endPtsOfContours + numberOfContours*2-2);
+
+      m = n + 2*numberOfContours;  // a loose bound on how many vertices we might need
+      vertices = (stbtt_vertex *) STBTT_malloc(m * sizeof(vertices[0]), info->userdata);
+      if (vertices == 0)
+         return 0;
+
+      next_move = 0;
+      flagcount=0;
+
+      // in first pass, we load uninterpreted data into the allocated array
+      // above, shifted to the end of the array so we won't overwrite it when
+      // we create our final data starting from the front
+
+      off = m - n; // starting offset for uninterpreted data, regardless of how m ends up being calculated
+
+      // first load flags
+
+      for (i=0; i < n; ++i) {
+         if (flagcount == 0) {
+            flags = *points++;
+            if (flags & 8)
+               flagcount = *points++;
+         } else
+            --flagcount;
+         vertices[off+i].type = flags;
+      }
+
+      // now load x coordinates
+      x=0;
+      for (i=0; i < n; ++i) {
+         flags = vertices[off+i].type;
+         if (flags & 2) {
+            stbtt_int16 dx = *points++;
+            x += (flags & 16) ? dx : -dx; // ???
+         } else {
+            if (!(flags & 16)) {
+               x = x + (stbtt_int16) (points[0]*256 + points[1]);
+               points += 2;
+            }
+         }
+         vertices[off+i].x = (stbtt_int16) x;
+      }
+
+      // now load y coordinates
+      y=0;
+      for (i=0; i < n; ++i) {
+         flags = vertices[off+i].type;
+         if (flags & 4) {
+            stbtt_int16 dy = *points++;
+            y += (flags & 32) ? dy : -dy; // ???
+         } else {
+            if (!(flags & 32)) {
+               y = y + (stbtt_int16) (points[0]*256 + points[1]);
+               points += 2;
+            }
+         }
+         vertices[off+i].y = (stbtt_int16) y;
+      }
+
+      // now convert them to our format
+      num_vertices=0;
+      sx = sy = cx = cy = scx = scy = 0;
+      for (i=0; i < n; ++i) {
+         flags = vertices[off+i].type;
+         x     = (stbtt_int16) vertices[off+i].x;
+         y     = (stbtt_int16) vertices[off+i].y;
+
+         if (next_move == i) {
+            if (i != 0)
+               num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
+
+            // now start the new one
+            start_off = !(flags & 1);
+            if (start_off) {
+               // if we start off with an off-curve point, then when we need to find a point on the curve
+               // where we can start, and we need to save some state for when we wraparound.
+               scx = x;
+               scy = y;
+               if (!(vertices[off+i+1].type & 1)) {
+                  // next point is also a curve point, so interpolate an on-point curve
+                  sx = (x + (stbtt_int32) vertices[off+i+1].x) >> 1;
+                  sy = (y + (stbtt_int32) vertices[off+i+1].y) >> 1;
+               } else {
+                  // otherwise just use the next point as our start point
+                  sx = (stbtt_int32) vertices[off+i+1].x;
+                  sy = (stbtt_int32) vertices[off+i+1].y;
+                  ++i; // we're using point i+1 as the starting point, so skip it
+               }
+            } else {
+               sx = x;
+               sy = y;
+            }
+            stbtt_setvertex(&vertices[num_vertices++], STBTT_vmove,sx,sy,0,0);
+            was_off = 0;
+            next_move = 1 + ttUSHORT(endPtsOfContours+j*2);
+            ++j;
+         } else {
+            if (!(flags & 1)) { // if it's a curve
+               if (was_off) // two off-curve control points in a row means interpolate an on-curve midpoint
+                  stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, (cx+x)>>1, (cy+y)>>1, cx, cy);
+               cx = x;
+               cy = y;
+               was_off = 1;
+            } else {
+               if (was_off)
+                  stbtt_setvertex(&vertices[num_vertices++], STBTT_vcurve, x,y, cx, cy);
+               else
+                  stbtt_setvertex(&vertices[num_vertices++], STBTT_vline, x,y,0,0);
+               was_off = 0;
+            }
+         }
+      }
+      num_vertices = stbtt__close_shape(vertices, num_vertices, was_off, start_off, sx,sy,scx,scy,cx,cy);
+   } else if (numberOfContours < 0) {
+      // Compound shapes.
+      int more = 1;
+      stbtt_uint8 *comp = data + g + 10;
+      num_vertices = 0;
+      vertices = 0;
+      while (more) {
+         stbtt_uint16 flags, gidx;
+         int comp_num_verts = 0, i;
+         stbtt_vertex *comp_verts = 0, *tmp = 0;
+         float mtx[6] = {1,0,0,1,0,0}, m, n;
+
+         flags = ttSHORT(comp); comp+=2;
+         gidx = ttSHORT(comp); comp+=2;
+
+         if (flags & 2) { // XY values
+            if (flags & 1) { // shorts
+               mtx[4] = ttSHORT(comp); comp+=2;
+               mtx[5] = ttSHORT(comp); comp+=2;
+            } else {
+               mtx[4] = ttCHAR(comp); comp+=1;
+               mtx[5] = ttCHAR(comp); comp+=1;
+            }
+         }
+         else {
+            // @TODO handle matching point
+            STBTT_assert(0);
+         }
+         if (flags & (1<<3)) { // WE_HAVE_A_SCALE
+            mtx[0] = mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+            mtx[1] = mtx[2] = 0;
+         } else if (flags & (1<<6)) { // WE_HAVE_AN_X_AND_YSCALE
+            mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
+            mtx[1] = mtx[2] = 0;
+            mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+         } else if (flags & (1<<7)) { // WE_HAVE_A_TWO_BY_TWO
+            mtx[0] = ttSHORT(comp)/16384.0f; comp+=2;
+            mtx[1] = ttSHORT(comp)/16384.0f; comp+=2;
+            mtx[2] = ttSHORT(comp)/16384.0f; comp+=2;
+            mtx[3] = ttSHORT(comp)/16384.0f; comp+=2;
+         }
+
+         // Find transformation scales.
+         m = (float) STBTT_sqrt(mtx[0]*mtx[0] + mtx[1]*mtx[1]);
+         n = (float) STBTT_sqrt(mtx[2]*mtx[2] + mtx[3]*mtx[3]);
+
+         // Get indexed glyph.
+         comp_num_verts = stbtt_GetGlyphShape(info, gidx, &comp_verts);
+         if (comp_num_verts > 0) {
+            // Transform vertices.
+            for (i = 0; i < comp_num_verts; ++i) {
+               stbtt_vertex* v = &comp_verts[i];
+               stbtt_vertex_type x,y;
+               x=v->x; y=v->y;
+               v->x = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
+               v->y = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
+               x=v->cx; y=v->cy;
+               v->cx = (stbtt_vertex_type)(m * (mtx[0]*x + mtx[2]*y + mtx[4]));
+               v->cy = (stbtt_vertex_type)(n * (mtx[1]*x + mtx[3]*y + mtx[5]));
+            }
+            // Append vertices.
+            tmp = (stbtt_vertex*)STBTT_malloc((num_vertices+comp_num_verts)*sizeof(stbtt_vertex), info->userdata);
+            if (!tmp) {
+               if (vertices) STBTT_free(vertices, info->userdata);
+               if (comp_verts) STBTT_free(comp_verts, info->userdata);
+               return 0;
+            }
+            if (num_vertices > 0) STBTT_memcpy(tmp, vertices, num_vertices*sizeof(stbtt_vertex));
+            STBTT_memcpy(tmp+num_vertices, comp_verts, comp_num_verts*sizeof(stbtt_vertex));
+            if (vertices) STBTT_free(vertices, info->userdata);
+            vertices = tmp;
+            STBTT_free(comp_verts, info->userdata);
+            num_vertices += comp_num_verts;
+         }
+         // More components ?
+         more = flags & (1<<5);
+      }
+   } else {
+      // numberOfCounters == 0, do nothing
+   }
+
+   *pvertices = vertices;
+   return num_vertices;
+}
+
+typedef struct
+{
+   int bounds;
+   int started;
+   float first_x, first_y;
+   float x, y;
+   stbtt_int32 min_x, max_x, min_y, max_y;
+
+   stbtt_vertex *pvertices;
+   int num_vertices;
+} stbtt__csctx;
+
+#define STBTT__CSCTX_INIT(bounds) {bounds,0, 0,0, 0,0, 0,0,0,0, NULL, 0}
+
+static void stbtt__track_vertex(stbtt__csctx *c, stbtt_int32 x, stbtt_int32 y)
+{
+   if (x > c->max_x || !c->started) c->max_x = x;
+   if (y > c->max_y || !c->started) c->max_y = y;
+   if (x < c->min_x || !c->started) c->min_x = x;
+   if (y < c->min_y || !c->started) c->min_y = y;
+   c->started = 1;
+}
+
+static void stbtt__csctx_v(stbtt__csctx *c, stbtt_uint8 type, stbtt_int32 x, stbtt_int32 y, stbtt_int32 cx, stbtt_int32 cy, stbtt_int32 cx1, stbtt_int32 cy1)
+{
+   if (c->bounds) {
+      stbtt__track_vertex(c, x, y);
+      if (type == STBTT_vcubic) {
+         stbtt__track_vertex(c, cx, cy);
+         stbtt__track_vertex(c, cx1, cy1);
+      }
+   } else {
+      stbtt_setvertex(&c->pvertices[c->num_vertices], type, x, y, cx, cy);
+      c->pvertices[c->num_vertices].cx1 = (stbtt_int16) cx1;
+      c->pvertices[c->num_vertices].cy1 = (stbtt_int16) cy1;
+   }
+   c->num_vertices++;
+}
+
+static void stbtt__csctx_close_shape(stbtt__csctx *ctx)
+{
+   if (ctx->first_x != ctx->x || ctx->first_y != ctx->y)
+      stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->first_x, (int)ctx->first_y, 0, 0, 0, 0);
+}
+
+static void stbtt__csctx_rmove_to(stbtt__csctx *ctx, float dx, float dy)
+{
+   stbtt__csctx_close_shape(ctx);
+   ctx->first_x = ctx->x = ctx->x + dx;
+   ctx->first_y = ctx->y = ctx->y + dy;
+   stbtt__csctx_v(ctx, STBTT_vmove, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0);
+}
+
+static void stbtt__csctx_rline_to(stbtt__csctx *ctx, float dx, float dy)
+{
+   ctx->x += dx;
+   ctx->y += dy;
+   stbtt__csctx_v(ctx, STBTT_vline, (int)ctx->x, (int)ctx->y, 0, 0, 0, 0);
+}
+
+static void stbtt__csctx_rccurve_to(stbtt__csctx *ctx, float dx1, float dy1, float dx2, float dy2, float dx3, float dy3)
+{
+   float cx1 = ctx->x + dx1;
+   float cy1 = ctx->y + dy1;
+   float cx2 = cx1 + dx2;
+   float cy2 = cy1 + dy2;
+   ctx->x = cx2 + dx3;
+   ctx->y = cy2 + dy3;
+   stbtt__csctx_v(ctx, STBTT_vcubic, (int)ctx->x, (int)ctx->y, (int)cx1, (int)cy1, (int)cx2, (int)cy2);
+}
+
+static stbtt__buf stbtt__get_subr(stbtt__buf idx, int n)
+{
+   int count = stbtt__cff_index_count(&idx);
+   int bias = 107;
+   if (count >= 33900)
+      bias = 32768;
+   else if (count >= 1240)
+      bias = 1131;
+   n += bias;
+   if (n < 0 || n >= count)
+      return stbtt__new_buf(NULL, 0);
+   return stbtt__cff_index_get(idx, n);
+}
+
+static stbtt__buf stbtt__cid_get_glyph_subrs(const stbtt_fontinfo *info, int glyph_index)
+{
+   stbtt__buf fdselect = info->fdselect;
+   int nranges, start, end, v, fmt, fdselector = -1, i;
+
+   stbtt__buf_seek(&fdselect, 0);
+   fmt = stbtt__buf_get8(&fdselect);
+   if (fmt == 0) {
+      // untested
+      stbtt__buf_skip(&fdselect, glyph_index);
+      fdselector = stbtt__buf_get8(&fdselect);
+   } else if (fmt == 3) {
+      nranges = stbtt__buf_get16(&fdselect);
+      start = stbtt__buf_get16(&fdselect);
+      for (i = 0; i < nranges; i++) {
+         v = stbtt__buf_get8(&fdselect);
+         end = stbtt__buf_get16(&fdselect);
+         if (glyph_index >= start && glyph_index < end) {
+            fdselector = v;
+            break;
+         }
+         start = end;
+      }
+   }
+   if (fdselector == -1) stbtt__new_buf(NULL, 0);
+   return stbtt__get_subrs(info->cff, stbtt__cff_index_get(info->fontdicts, fdselector));
+}
+
+static int stbtt__run_charstring(const stbtt_fontinfo *info, int glyph_index, stbtt__csctx *c)
+{
+   int in_header = 1, maskbits = 0, subr_stack_height = 0, sp = 0, v, i, b0;
+   int has_subrs = 0, clear_stack;
+   float s[48];
+   stbtt__buf subr_stack[10], subrs = info->subrs, b;
+   float f;
+
+#define STBTT__CSERR(s) (0)
+
+   // this currently ignores the initial width value, which isn't needed if we have hmtx
+   b = stbtt__cff_index_get(info->charstrings, glyph_index);
+   while (b.cursor < b.size) {
+      i = 0;
+      clear_stack = 1;
+      b0 = stbtt__buf_get8(&b);
+      switch (b0) {
+      // @TODO implement hinting
+      case 0x13: // hintmask
+      case 0x14: // cntrmask
+         if (in_header)
+            maskbits += (sp / 2); // implicit "vstem"
+         in_header = 0;
+         stbtt__buf_skip(&b, (maskbits + 7) / 8);
+         break;
+
+      case 0x01: // hstem
+      case 0x03: // vstem
+      case 0x12: // hstemhm
+      case 0x17: // vstemhm
+         maskbits += (sp / 2);
+         break;
+
+      case 0x15: // rmoveto
+         in_header = 0;
+         if (sp < 2) return STBTT__CSERR("rmoveto stack");
+         stbtt__csctx_rmove_to(c, s[sp-2], s[sp-1]);
+         break;
+      case 0x04: // vmoveto
+         in_header = 0;
+         if (sp < 1) return STBTT__CSERR("vmoveto stack");
+         stbtt__csctx_rmove_to(c, 0, s[sp-1]);
+         break;
+      case 0x16: // hmoveto
+         in_header = 0;
+         if (sp < 1) return STBTT__CSERR("hmoveto stack");
+         stbtt__csctx_rmove_to(c, s[sp-1], 0);
+         break;
+
+      case 0x05: // rlineto
+         if (sp < 2) return STBTT__CSERR("rlineto stack");
+         for (; i + 1 < sp; i += 2)
+            stbtt__csctx_rline_to(c, s[i], s[i+1]);
+         break;
+
+      // hlineto/vlineto and vhcurveto/hvcurveto alternate horizontal and vertical
+      // starting from a different place.
+
+      case 0x07: // vlineto
+         if (sp < 1) return STBTT__CSERR("vlineto stack");
+         goto vlineto;
+      case 0x06: // hlineto
+         if (sp < 1) return STBTT__CSERR("hlineto stack");
+         for (;;) {
+            if (i >= sp) break;
+            stbtt__csctx_rline_to(c, s[i], 0);
+            i++;
+      vlineto:
+            if (i >= sp) break;
+            stbtt__csctx_rline_to(c, 0, s[i]);
+            i++;
+         }
+         break;
+
+      case 0x1F: // hvcurveto
+         if (sp < 4) return STBTT__CSERR("hvcurveto stack");
+         goto hvcurveto;
+      case 0x1E: // vhcurveto
+         if (sp < 4) return STBTT__CSERR("vhcurveto stack");
+         for (;;) {
+            if (i + 3 >= sp) break;
+            stbtt__csctx_rccurve_to(c, 0, s[i], s[i+1], s[i+2], s[i+3], (sp - i == 5) ? s[i + 4] : 0.0f);
+            i += 4;
+      hvcurveto:
+            if (i + 3 >= sp) break;
+            stbtt__csctx_rccurve_to(c, s[i], 0, s[i+1], s[i+2], (sp - i == 5) ? s[i+4] : 0.0f, s[i+3]);
+            i += 4;
+         }
+         break;
+
+      case 0x08: // rrcurveto
+         if (sp < 6) return STBTT__CSERR("rcurveline stack");
+         for (; i + 5 < sp; i += 6)
+            stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]);
+         break;
+
+      case 0x18: // rcurveline
+         if (sp < 8) return STBTT__CSERR("rcurveline stack");
+         for (; i + 5 < sp - 2; i += 6)
+            stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]);
+         if (i + 1 >= sp) return STBTT__CSERR("rcurveline stack");
+         stbtt__csctx_rline_to(c, s[i], s[i+1]);
+         break;
+
+      case 0x19: // rlinecurve
+         if (sp < 8) return STBTT__CSERR("rlinecurve stack");
+         for (; i + 1 < sp - 6; i += 2)
+            stbtt__csctx_rline_to(c, s[i], s[i+1]);
+         if (i + 5 >= sp) return STBTT__CSERR("rlinecurve stack");
+         stbtt__csctx_rccurve_to(c, s[i], s[i+1], s[i+2], s[i+3], s[i+4], s[i+5]);
+         break;
+
+      case 0x1A: // vvcurveto
+      case 0x1B: // hhcurveto
+         if (sp < 4) return STBTT__CSERR("(vv|hh)curveto stack");
+         f = 0.0;
+         if (sp & 1) { f = s[i]; i++; }
+         for (; i + 3 < sp; i += 4) {
+            if (b0 == 0x1B)
+               stbtt__csctx_rccurve_to(c, s[i], f, s[i+1], s[i+2], s[i+3], 0.0);
+            else
+               stbtt__csctx_rccurve_to(c, f, s[i], s[i+1], s[i+2], 0.0, s[i+3]);
+            f = 0.0;
+         }
+         break;
+
+      case 0x0A: // callsubr
+         if (!has_subrs) {
+            if (info->fdselect.size)
+               subrs = stbtt__cid_get_glyph_subrs(info, glyph_index);
+            has_subrs = 1;
+         }
+         // fallthrough
+      case 0x1D: // callgsubr
+         if (sp < 1) return STBTT__CSERR("call(g|)subr stack");
+         v = (int) s[--sp];
+         if (subr_stack_height >= 10) return STBTT__CSERR("recursion limit");
+         subr_stack[subr_stack_height++] = b;
+         b = stbtt__get_subr(b0 == 0x0A ? subrs : info->gsubrs, v);
+         if (b.size == 0) return STBTT__CSERR("subr not found");
+         b.cursor = 0;
+         clear_stack = 0;
+         break;
+
+      case 0x0B: // return
+         if (subr_stack_height <= 0) return STBTT__CSERR("return outside subr");
+         b = subr_stack[--subr_stack_height];
+         clear_stack = 0;
+         break;
+
+      case 0x0E: // endchar
+         stbtt__csctx_close_shape(c);
+         return 1;
+
+      case 0x0C: { // two-byte escape
+         float dx1, dx2, dx3, dx4, dx5, dx6, dy1, dy2, dy3, dy4, dy5, dy6;
+         float dx, dy;
+         int b1 = stbtt__buf_get8(&b);
+         switch (b1) {
+         // @TODO These "flex" implementations ignore the flex-depth and resolution,
+         // and always draw beziers.
+         case 0x22: // hflex
+            if (sp < 7) return STBTT__CSERR("hflex stack");
+            dx1 = s[0];
+            dx2 = s[1];
+            dy2 = s[2];
+            dx3 = s[3];
+            dx4 = s[4];
+            dx5 = s[5];
+            dx6 = s[6];
+            stbtt__csctx_rccurve_to(c, dx1, 0, dx2, dy2, dx3, 0);
+            stbtt__csctx_rccurve_to(c, dx4, 0, dx5, -dy2, dx6, 0);
+            break;
+
+         case 0x23: // flex
+            if (sp < 13) return STBTT__CSERR("flex stack");
+            dx1 = s[0];
+            dy1 = s[1];
+            dx2 = s[2];
+            dy2 = s[3];
+            dx3 = s[4];
+            dy3 = s[5];
+            dx4 = s[6];
+            dy4 = s[7];
+            dx5 = s[8];
+            dy5 = s[9];
+            dx6 = s[10];
+            dy6 = s[11];
+            //fd is s[12]
+            stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3);
+            stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6);
+            break;
+
+         case 0x24: // hflex1
+            if (sp < 9) return STBTT__CSERR("hflex1 stack");
+            dx1 = s[0];
+            dy1 = s[1];
+            dx2 = s[2];
+            dy2 = s[3];
+            dx3 = s[4];
+            dx4 = s[5];
+            dx5 = s[6];
+            dy5 = s[7];
+            dx6 = s[8];
+            stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, 0);
+            stbtt__csctx_rccurve_to(c, dx4, 0, dx5, dy5, dx6, -(dy1+dy2+dy5));
+            break;
+
+         case 0x25: // flex1
+            if (sp < 11) return STBTT__CSERR("flex1 stack");
+            dx1 = s[0];
+            dy1 = s[1];
+            dx2 = s[2];
+            dy2 = s[3];
+            dx3 = s[4];
+            dy3 = s[5];
+            dx4 = s[6];
+            dy4 = s[7];
+            dx5 = s[8];
+            dy5 = s[9];
+            dx6 = dy6 = s[10];
+            dx = dx1+dx2+dx3+dx4+dx5;
+            dy = dy1+dy2+dy3+dy4+dy5;
+            if (STBTT_fabs(dx) > STBTT_fabs(dy))
+               dy6 = -dy;
+            else
+               dx6 = -dx;
+            stbtt__csctx_rccurve_to(c, dx1, dy1, dx2, dy2, dx3, dy3);
+            stbtt__csctx_rccurve_to(c, dx4, dy4, dx5, dy5, dx6, dy6);
+            break;
+
+         default:
+            return STBTT__CSERR("unimplemented");
+         }
+      } break;
+
+      default:
+         if (b0 != 255 && b0 != 28 && (b0 < 32 || b0 > 254))
+            return STBTT__CSERR("reserved operator");
+
+         // push immediate
+         if (b0 == 255) {
+            f = (float)(stbtt_int32)stbtt__buf_get32(&b) / 0x10000;
+         } else {
+            stbtt__buf_skip(&b, -1);
+            f = (float)(stbtt_int16)stbtt__cff_int(&b);
+         }
+         if (sp >= 48) return STBTT__CSERR("push stack overflow");
+         s[sp++] = f;
+         clear_stack = 0;
+         break;
+      }
+      if (clear_stack) sp = 0;
+   }
+   return STBTT__CSERR("no endchar");
+
+#undef STBTT__CSERR
+}
+
+static int stbtt__GetGlyphShapeT2(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
+{
+   // runs the charstring twice, once to count and once to output (to avoid realloc)
+   stbtt__csctx count_ctx = STBTT__CSCTX_INIT(1);
+   stbtt__csctx output_ctx = STBTT__CSCTX_INIT(0);
+   if (stbtt__run_charstring(info, glyph_index, &count_ctx)) {
+      *pvertices = (stbtt_vertex*)STBTT_malloc(count_ctx.num_vertices*sizeof(stbtt_vertex), info->userdata);
+      output_ctx.pvertices = *pvertices;
+      if (stbtt__run_charstring(info, glyph_index, &output_ctx)) {
+         STBTT_assert(output_ctx.num_vertices == count_ctx.num_vertices);
+         return output_ctx.num_vertices;
+      }
+   }
+   *pvertices = NULL;
+   return 0;
+}
+
+static int stbtt__GetGlyphInfoT2(const stbtt_fontinfo *info, int glyph_index, int *x0, int *y0, int *x1, int *y1)
+{
+   stbtt__csctx c = STBTT__CSCTX_INIT(1);
+   int r = stbtt__run_charstring(info, glyph_index, &c);
+   if (x0)  *x0 = r ? c.min_x : 0;
+   if (y0)  *y0 = r ? c.min_y : 0;
+   if (x1)  *x1 = r ? c.max_x : 0;
+   if (y1)  *y1 = r ? c.max_y : 0;
+   return r ? c.num_vertices : 0;
+}
+
+STBTT_DEF int stbtt_GetGlyphShape(const stbtt_fontinfo *info, int glyph_index, stbtt_vertex **pvertices)
+{
+   if (!info->cff.size)
+      return stbtt__GetGlyphShapeTT(info, glyph_index, pvertices);
+   else
+      return stbtt__GetGlyphShapeT2(info, glyph_index, pvertices);
+}
+
+STBTT_DEF void stbtt_GetGlyphHMetrics(const stbtt_fontinfo *info, int glyph_index, int *advanceWidth, int *leftSideBearing)
+{
+   stbtt_uint16 numOfLongHorMetrics = ttUSHORT(info->data+info->hhea + 34);
+   if (glyph_index < numOfLongHorMetrics) {
+      if (advanceWidth)     *advanceWidth    = ttSHORT(info->data + info->hmtx + 4*glyph_index);
+      if (leftSideBearing)  *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*glyph_index + 2);
+   } else {
+      if (advanceWidth)     *advanceWidth    = ttSHORT(info->data + info->hmtx + 4*(numOfLongHorMetrics-1));
+      if (leftSideBearing)  *leftSideBearing = ttSHORT(info->data + info->hmtx + 4*numOfLongHorMetrics + 2*(glyph_index - numOfLongHorMetrics));
+   }
+}
+
+STBTT_DEF int  stbtt_GetKerningTableLength(const stbtt_fontinfo *info)
+{
+   stbtt_uint8 *data = info->data + info->kern;
+
+   // we only look at the first table. it must be 'horizontal' and format 0.
+   if (!info->kern)
+      return 0;
+   if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
+      return 0;
+   if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
+      return 0;
+
+   return ttUSHORT(data+10);
+}
+
+STBTT_DEF int stbtt_GetKerningTable(const stbtt_fontinfo *info, stbtt_kerningentry* table, int table_length)
+{
+   stbtt_uint8 *data = info->data + info->kern;
+   int k, length;
+
+   // we only look at the first table. it must be 'horizontal' and format 0.
+   if (!info->kern)
+      return 0;
+   if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
+      return 0;
+   if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
+      return 0;
+
+   length = ttUSHORT(data+10);
+   if (table_length < length)
+      length = table_length;
+
+   for (k = 0; k < length; k++)
+   {
+      table[k].glyph1 = ttUSHORT(data+18+(k*6));
+      table[k].glyph2 = ttUSHORT(data+20+(k*6));
+      table[k].advance = ttSHORT(data+22+(k*6));
+   }
+
+   return length;
+}
+
+static int  stbtt__GetGlyphKernInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
+{
+   stbtt_uint8 *data = info->data + info->kern;
+   stbtt_uint32 needle, straw;
+   int l, r, m;
+
+   // we only look at the first table. it must be 'horizontal' and format 0.
+   if (!info->kern)
+      return 0;
+   if (ttUSHORT(data+2) < 1) // number of tables, need at least 1
+      return 0;
+   if (ttUSHORT(data+8) != 1) // horizontal flag must be set in format
+      return 0;
+
+   l = 0;
+   r = ttUSHORT(data+10) - 1;
+   needle = glyph1 << 16 | glyph2;
+   while (l <= r) {
+      m = (l + r) >> 1;
+      straw = ttULONG(data+18+(m*6)); // note: unaligned read
+      if (needle < straw)
+         r = m - 1;
+      else if (needle > straw)
+         l = m + 1;
+      else
+         return ttSHORT(data+22+(m*6));
+   }
+   return 0;
+}
+
+static stbtt_int32  stbtt__GetCoverageIndex(stbtt_uint8 *coverageTable, int glyph)
+{
+    stbtt_uint16 coverageFormat = ttUSHORT(coverageTable);
+    switch(coverageFormat) {
+        case 1: {
+            stbtt_uint16 glyphCount = ttUSHORT(coverageTable + 2);
+
+            // Binary search.
+            stbtt_int32 l=0, r=glyphCount-1, m;
+            int straw, needle=glyph;
+            while (l <= r) {
+                stbtt_uint8 *glyphArray = coverageTable + 4;
+                stbtt_uint16 glyphID;
+                m = (l + r) >> 1;
+                glyphID = ttUSHORT(glyphArray + 2 * m);
+                straw = glyphID;
+                if (needle < straw)
+                    r = m - 1;
+                else if (needle > straw)
+                    l = m + 1;
+                else {
+                     return m;
+                }
+            }
+        } break;
+
+        case 2: {
+            stbtt_uint16 rangeCount = ttUSHORT(coverageTable + 2);
+            stbtt_uint8 *rangeArray = coverageTable + 4;
+
+            // Binary search.
+            stbtt_int32 l=0, r=rangeCount-1, m;
+            int strawStart, strawEnd, needle=glyph;
+            while (l <= r) {
+                stbtt_uint8 *rangeRecord;
+                m = (l + r) >> 1;
+                rangeRecord = rangeArray + 6 * m;
+                strawStart = ttUSHORT(rangeRecord);
+                strawEnd = ttUSHORT(rangeRecord + 2);
+                if (needle < strawStart)
+                    r = m - 1;
+                else if (needle > strawEnd)
+                    l = m + 1;
+                else {
+                    stbtt_uint16 startCoverageIndex = ttUSHORT(rangeRecord + 4);
+                    return startCoverageIndex + glyph - strawStart;
+                }
+            }
+        } break;
+
+        default: {
+            // There are no other cases.
+            STBTT_assert(0);
+        } break;
+    }
+
+    return -1;
+}
+
+static stbtt_int32  stbtt__GetGlyphClass(stbtt_uint8 *classDefTable, int glyph)
+{
+    stbtt_uint16 classDefFormat = ttUSHORT(classDefTable);
+    switch(classDefFormat)
+    {
+        case 1: {
+            stbtt_uint16 startGlyphID = ttUSHORT(classDefTable + 2);
+            stbtt_uint16 glyphCount = ttUSHORT(classDefTable + 4);
+            stbtt_uint8 *classDef1ValueArray = classDefTable + 6;
+
+            if (glyph >= startGlyphID && glyph < startGlyphID + glyphCount)
+                return (stbtt_int32)ttUSHORT(classDef1ValueArray + 2 * (glyph - startGlyphID));
+
+            classDefTable = classDef1ValueArray + 2 * glyphCount;
+        } break;
+
+        case 2: {
+            stbtt_uint16 classRangeCount = ttUSHORT(classDefTable + 2);
+            stbtt_uint8 *classRangeRecords = classDefTable + 4;
+
+            // Binary search.
+            stbtt_int32 l=0, r=classRangeCount-1, m;
+            int strawStart, strawEnd, needle=glyph;
+            while (l <= r) {
+                stbtt_uint8 *classRangeRecord;
+                m = (l + r) >> 1;
+                classRangeRecord = classRangeRecords + 6 * m;
+                strawStart = ttUSHORT(classRangeRecord);
+                strawEnd = ttUSHORT(classRangeRecord + 2);
+                if (needle < strawStart)
+                    r = m - 1;
+                else if (needle > strawEnd)
+                    l = m + 1;
+                else
+                    return (stbtt_int32)ttUSHORT(classRangeRecord + 4);
+            }
+
+            classDefTable = classRangeRecords + 6 * classRangeCount;
+        } break;
+
+        default: {
+            // There are no other cases.
+            STBTT_assert(0);
+        } break;
+    }
+
+    return -1;
+}
+
+// Define to STBTT_assert(x) if you want to break on unimplemented formats.
+#define STBTT_GPOS_TODO_assert(x)
+
+static stbtt_int32  stbtt__GetGlyphGPOSInfoAdvance(const stbtt_fontinfo *info, int glyph1, int glyph2)
+{
+    stbtt_uint16 lookupListOffset;
+    stbtt_uint8 *lookupList;
+    stbtt_uint16 lookupCount;
+    stbtt_uint8 *data;
+    stbtt_int32 i;
+
+    if (!info->gpos) return 0;
+
+    data = info->data + info->gpos;
+
+    if (ttUSHORT(data+0) != 1) return 0; // Major version 1
+    if (ttUSHORT(data+2) != 0) return 0; // Minor version 0
+
+    lookupListOffset = ttUSHORT(data+8);
+    lookupList = data + lookupListOffset;
+    lookupCount = ttUSHORT(lookupList);
+
+    for (i=0; i<lookupCount; ++i) {
+        stbtt_uint16 lookupOffset = ttUSHORT(lookupList + 2 + 2 * i);
+        stbtt_uint8 *lookupTable = lookupList + lookupOffset;
+
+        stbtt_uint16 lookupType = ttUSHORT(lookupTable);
+        stbtt_uint16 subTableCount = ttUSHORT(lookupTable + 4);
+        stbtt_uint8 *subTableOffsets = lookupTable + 6;
+        switch(lookupType) {
+            case 2: { // Pair Adjustment Positioning Subtable
+                stbtt_int32 sti;
+                for (sti=0; sti<subTableCount; sti++) {
+                    stbtt_uint16 subtableOffset = ttUSHORT(subTableOffsets + 2 * sti);
+                    stbtt_uint8 *table = lookupTable + subtableOffset;
+                    stbtt_uint16 posFormat = ttUSHORT(table);
+                    stbtt_uint16 coverageOffset = ttUSHORT(table + 2);
+                    stbtt_int32 coverageIndex = stbtt__GetCoverageIndex(table + coverageOffset, glyph1);
+                    if (coverageIndex == -1) continue;
+
+                    switch (posFormat) {
+                        case 1: {
+                            stbtt_int32 l, r, m;
+                            int straw, needle;
+                            stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
+                            stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
+                            stbtt_int32 valueRecordPairSizeInBytes = 2;
+                            stbtt_uint16 pairSetCount = ttUSHORT(table + 8);
+                            stbtt_uint16 pairPosOffset = ttUSHORT(table + 10 + 2 * coverageIndex);
+                            stbtt_uint8 *pairValueTable = table + pairPosOffset;
+                            stbtt_uint16 pairValueCount = ttUSHORT(pairValueTable);
+                            stbtt_uint8 *pairValueArray = pairValueTable + 2;
+                            // TODO: Support more formats.
+                            STBTT_GPOS_TODO_assert(valueFormat1 == 4);
+                            if (valueFormat1 != 4) return 0;
+                            STBTT_GPOS_TODO_assert(valueFormat2 == 0);
+                            if (valueFormat2 != 0) return 0;
+
+                            STBTT_assert(coverageIndex < pairSetCount);
+                            STBTT__NOTUSED(pairSetCount);
+
+                            needle=glyph2;
+                            r=pairValueCount-1;
+                            l=0;
+
+                            // Binary search.
+                            while (l <= r) {
+                                stbtt_uint16 secondGlyph;
+                                stbtt_uint8 *pairValue;
+                                m = (l + r) >> 1;
+                                pairValue = pairValueArray + (2 + valueRecordPairSizeInBytes) * m;
+                                secondGlyph = ttUSHORT(pairValue);
+                                straw = secondGlyph;
+                                if (needle < straw)
+                                    r = m - 1;
+                                else if (needle > straw)
+                                    l = m + 1;
+                                else {
+                                    stbtt_int16 xAdvance = ttSHORT(pairValue + 2);
+                                    return xAdvance;
+                                }
+                            }
+                        } break;
+
+                        case 2: {
+                            stbtt_uint16 valueFormat1 = ttUSHORT(table + 4);
+                            stbtt_uint16 valueFormat2 = ttUSHORT(table + 6);
+
+                            stbtt_uint16 classDef1Offset = ttUSHORT(table + 8);
+                            stbtt_uint16 classDef2Offset = ttUSHORT(table + 10);
+                            int glyph1class = stbtt__GetGlyphClass(table + classDef1Offset, glyph1);
+                            int glyph2class = stbtt__GetGlyphClass(table + classDef2Offset, glyph2);
+
+                            stbtt_uint16 class1Count = ttUSHORT(table + 12);
+                            stbtt_uint16 class2Count = ttUSHORT(table + 14);
+                            STBTT_assert(glyph1class < class1Count);
+                            STBTT_assert(glyph2class < class2Count);
+
+                            // TODO: Support more formats.
+                            STBTT_GPOS_TODO_assert(valueFormat1 == 4);
+                            if (valueFormat1 != 4) return 0;
+                            STBTT_GPOS_TODO_assert(valueFormat2 == 0);
+                            if (valueFormat2 != 0) return 0;
+
+                            if (glyph1class >= 0 && glyph1class < class1Count && glyph2class >= 0 && glyph2class < class2Count) {
+                                stbtt_uint8 *class1Records = table + 16;
+                                stbtt_uint8 *class2Records = class1Records + 2 * (glyph1class * class2Count);
+                                stbtt_int16 xAdvance = ttSHORT(class2Records + 2 * glyph2class);
+                                return xAdvance;
+                            }
+                        } break;
+
+                        default: {
+                            // There are no other cases.
+                            STBTT_assert(0);
+                            break;
+                        };
+                    }
+                }
+                break;
+            };
+
+            default:
+                // TODO: Implement other stuff.
+                break;
+        }
+    }
+
+    return 0;
+}
+
+STBTT_DEF int  stbtt_GetGlyphKernAdvance(const stbtt_fontinfo *info, int g1, int g2)
+{
+   int xAdvance = 0;
+
+   if (info->gpos)
+      xAdvance += stbtt__GetGlyphGPOSInfoAdvance(info, g1, g2);
+   else if (info->kern)
+      xAdvance += stbtt__GetGlyphKernInfoAdvance(info, g1, g2);
+
+   return xAdvance;
+}
+
+STBTT_DEF int  stbtt_GetCodepointKernAdvance(const stbtt_fontinfo *info, int ch1, int ch2)
+{
+   if (!info->kern && !info->gpos) // if no kerning table, don't waste time looking up both codepoint->glyphs
+      return 0;
+   return stbtt_GetGlyphKernAdvance(info, stbtt_FindGlyphIndex(info,ch1), stbtt_FindGlyphIndex(info,ch2));
+}
+
+STBTT_DEF void stbtt_GetCodepointHMetrics(const stbtt_fontinfo *info, int codepoint, int *advanceWidth, int *leftSideBearing)
+{
+   stbtt_GetGlyphHMetrics(info, stbtt_FindGlyphIndex(info,codepoint), advanceWidth, leftSideBearing);
+}
+
+STBTT_DEF void stbtt_GetFontVMetrics(const stbtt_fontinfo *info, int *ascent, int *descent, int *lineGap)
+{
+   if (ascent ) *ascent  = ttSHORT(info->data+info->hhea + 4);
+   if (descent) *descent = ttSHORT(info->data+info->hhea + 6);
+   if (lineGap) *lineGap = ttSHORT(info->data+info->hhea + 8);
+}
+
+STBTT_DEF int  stbtt_GetFontVMetricsOS2(const stbtt_fontinfo *info, int *typoAscent, int *typoDescent, int *typoLineGap)
+{
+   int tab = stbtt__find_table(info->data, info->fontstart, "OS/2");
+   if (!tab)
+      return 0;
+   if (typoAscent ) *typoAscent  = ttSHORT(info->data+tab + 68);
+   if (typoDescent) *typoDescent = ttSHORT(info->data+tab + 70);
+   if (typoLineGap) *typoLineGap = ttSHORT(info->data+tab + 72);
+   return 1;
+}
+
+STBTT_DEF void stbtt_GetFontBoundingBox(const stbtt_fontinfo *info, int *x0, int *y0, int *x1, int *y1)
+{
+   *x0 = ttSHORT(info->data + info->head + 36);
+   *y0 = ttSHORT(info->data + info->head + 38);
+   *x1 = ttSHORT(info->data + info->head + 40);
+   *y1 = ttSHORT(info->data + info->head + 42);
+}
+
+STBTT_DEF float stbtt_ScaleForPixelHeight(const stbtt_fontinfo *info, float height)
+{
+   int fheight = ttSHORT(info->data + info->hhea + 4) - ttSHORT(info->data + info->hhea + 6);
+   return (float) height / fheight;
+}
+
+STBTT_DEF float stbtt_ScaleForMappingEmToPixels(const stbtt_fontinfo *info, float pixels)
+{
+   int unitsPerEm = ttUSHORT(info->data + info->head + 18);
+   return pixels / unitsPerEm;
+}
+
+STBTT_DEF void stbtt_FreeShape(const stbtt_fontinfo *info, stbtt_vertex *v)
+{
+   STBTT_free(v, info->userdata);
+}
+
+STBTT_DEF stbtt_uint8 *stbtt_FindSVGDoc(const stbtt_fontinfo *info, int gl)
+{
+   int i;
+   stbtt_uint8 *data = info->data;
+   stbtt_uint8 *svg_doc_list = data + stbtt__get_svg((stbtt_fontinfo *) info);
+
+   int numEntries = ttUSHORT(svg_doc_list);
+   stbtt_uint8 *svg_docs = svg_doc_list + 2;
+
+   for(i=0; i<numEntries; i++) {
+      stbtt_uint8 *svg_doc = svg_docs + (12 * i);
+      if ((gl >= ttUSHORT(svg_doc)) && (gl <= ttUSHORT(svg_doc + 2)))
+         return svg_doc;
+   }
+   return 0;
+}
+
+STBTT_DEF int stbtt_GetGlyphSVG(const stbtt_fontinfo *info, int gl, const char **svg)
+{
+   stbtt_uint8 *data = info->data;
+   stbtt_uint8 *svg_doc;
+
+   if (info->svg == 0)
+      return 0;
+
+   svg_doc = stbtt_FindSVGDoc(info, gl);
+   if (svg_doc != NULL) {
+      *svg = (char *) data + info->svg + ttULONG(svg_doc + 4);
+      return ttULONG(svg_doc + 8);
+   } else {
+      return 0;
+   }
+}
+
+STBTT_DEF int stbtt_GetCodepointSVG(const stbtt_fontinfo *info, int unicode_codepoint, const char **svg)
+{
+   return stbtt_GetGlyphSVG(info, stbtt_FindGlyphIndex(info, unicode_codepoint), svg);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// antialiasing software rasterizer
+//
+
+STBTT_DEF void stbtt_GetGlyphBitmapBoxSubpixel(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y,float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+   int x0=0,y0=0,x1,y1; // =0 suppresses compiler warning
+   if (!stbtt_GetGlyphBox(font, glyph, &x0,&y0,&x1,&y1)) {
+      // e.g. space character
+      if (ix0) *ix0 = 0;
+      if (iy0) *iy0 = 0;
+      if (ix1) *ix1 = 0;
+      if (iy1) *iy1 = 0;
+   } else {
+      // move to integral bboxes (treating pixels as little squares, what pixels get touched)?
+      if (ix0) *ix0 = STBTT_ifloor( x0 * scale_x + shift_x);
+      if (iy0) *iy0 = STBTT_ifloor(-y1 * scale_y + shift_y);
+      if (ix1) *ix1 = STBTT_iceil ( x1 * scale_x + shift_x);
+      if (iy1) *iy1 = STBTT_iceil (-y0 * scale_y + shift_y);
+   }
+}
+
+STBTT_DEF void stbtt_GetGlyphBitmapBox(const stbtt_fontinfo *font, int glyph, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+   stbtt_GetGlyphBitmapBoxSubpixel(font, glyph, scale_x, scale_y,0.0f,0.0f, ix0, iy0, ix1, iy1);
+}
+
+STBTT_DEF void stbtt_GetCodepointBitmapBoxSubpixel(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, float shift_x, float shift_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+   stbtt_GetGlyphBitmapBoxSubpixel(font, stbtt_FindGlyphIndex(font,codepoint), scale_x, scale_y,shift_x,shift_y, ix0,iy0,ix1,iy1);
+}
+
+STBTT_DEF void stbtt_GetCodepointBitmapBox(const stbtt_fontinfo *font, int codepoint, float scale_x, float scale_y, int *ix0, int *iy0, int *ix1, int *iy1)
+{
+   stbtt_GetCodepointBitmapBoxSubpixel(font, codepoint, scale_x, scale_y,0.0f,0.0f, ix0,iy0,ix1,iy1);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+//  Rasterizer
+
+typedef struct stbtt__hheap_chunk
+{
+   struct stbtt__hheap_chunk *next;
+} stbtt__hheap_chunk;
+
+typedef struct stbtt__hheap
+{
+   struct stbtt__hheap_chunk *head;
+   void   *first_free;
+   int    num_remaining_in_head_chunk;
+} stbtt__hheap;
+
+static void *stbtt__hheap_alloc(stbtt__hheap *hh, size_t size, void *userdata)
+{
+   if (hh->first_free) {
+      void *p = hh->first_free;
+      hh->first_free = * (void **) p;
+      return p;
+   } else {
+      if (hh->num_remaining_in_head_chunk == 0) {
+         int count = (size < 32 ? 2000 : size < 128 ? 800 : 100);
+         stbtt__hheap_chunk *c = (stbtt__hheap_chunk *) STBTT_malloc(sizeof(stbtt__hheap_chunk) + size * count, userdata);
+         if (c == NULL)
+            return NULL;
+         c->next = hh->head;
+         hh->head = c;
+         hh->num_remaining_in_head_chunk = count;
+      }
+      --hh->num_remaining_in_head_chunk;
+      return (char *) (hh->head) + sizeof(stbtt__hheap_chunk) + size * hh->num_remaining_in_head_chunk;
+   }
+}
+
+static void stbtt__hheap_free(stbtt__hheap *hh, void *p)
+{
+   *(void **) p = hh->first_free;
+   hh->first_free = p;
+}
+
+static void stbtt__hheap_cleanup(stbtt__hheap *hh, void *userdata)
+{
+   stbtt__hheap_chunk *c = hh->head;
+   while (c) {
+      stbtt__hheap_chunk *n = c->next;
+      STBTT_free(c, userdata);
+      c = n;
+   }
+}
+
+typedef struct stbtt__edge {
+   float x0,y0, x1,y1;
+   int invert;
+} stbtt__edge;
+
+
+typedef struct stbtt__active_edge
+{
+   struct stbtt__active_edge *next;
+   #if STBTT_RASTERIZER_VERSION==1
+   int x,dx;
+   float ey;
+   int direction;
+   #elif STBTT_RASTERIZER_VERSION==2
+   float fx,fdx,fdy;
+   float direction;
+   float sy;
+   float ey;
+   #else
+   #error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+   #endif
+} stbtt__active_edge;
+
+#if STBTT_RASTERIZER_VERSION == 1
+#define STBTT_FIXSHIFT   10
+#define STBTT_FIX        (1 << STBTT_FIXSHIFT)
+#define STBTT_FIXMASK    (STBTT_FIX-1)
+
+static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata)
+{
+   stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
+   float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
+   STBTT_assert(z != NULL);
+   if (!z) return z;
+
+   // round dx down to avoid overshooting
+   if (dxdy < 0)
+      z->dx = -STBTT_ifloor(STBTT_FIX * -dxdy);
+   else
+      z->dx = STBTT_ifloor(STBTT_FIX * dxdy);
+
+   z->x = STBTT_ifloor(STBTT_FIX * e->x0 + z->dx * (start_point - e->y0)); // use z->dx so when we offset later it's by the same amount
+   z->x -= off_x * STBTT_FIX;
+
+   z->ey = e->y1;
+   z->next = 0;
+   z->direction = e->invert ? 1 : -1;
+   return z;
+}
+#elif STBTT_RASTERIZER_VERSION == 2
+static stbtt__active_edge *stbtt__new_active(stbtt__hheap *hh, stbtt__edge *e, int off_x, float start_point, void *userdata)
+{
+   stbtt__active_edge *z = (stbtt__active_edge *) stbtt__hheap_alloc(hh, sizeof(*z), userdata);
+   float dxdy = (e->x1 - e->x0) / (e->y1 - e->y0);
+   STBTT_assert(z != NULL);
+   //STBTT_assert(e->y0 <= start_point);
+   if (!z) return z;
+   z->fdx = dxdy;
+   z->fdy = dxdy != 0.0f ? (1.0f/dxdy) : 0.0f;
+   z->fx = e->x0 + dxdy * (start_point - e->y0);
+   z->fx -= off_x;
+   z->direction = e->invert ? 1.0f : -1.0f;
+   z->sy = e->y0;
+   z->ey = e->y1;
+   z->next = 0;
+   return z;
+}
+#else
+#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+#endif
+
+#if STBTT_RASTERIZER_VERSION == 1
+// note: this routine clips fills that extend off the edges... ideally this
+// wouldn't happen, but it could happen if the truetype glyph bounding boxes
+// are wrong, or if the user supplies a too-small bitmap
+static void stbtt__fill_active_edges(unsigned char *scanline, int len, stbtt__active_edge *e, int max_weight)
+{
+   // non-zero winding fill
+   int x0=0, w=0;
+
+   while (e) {
+      if (w == 0) {
+         // if we're currently at zero, we need to record the edge start point
+         x0 = e->x; w += e->direction;
+      } else {
+         int x1 = e->x; w += e->direction;
+         // if we went to zero, we need to draw
+         if (w == 0) {
+            int i = x0 >> STBTT_FIXSHIFT;
+            int j = x1 >> STBTT_FIXSHIFT;
+
+            if (i < len && j >= 0) {
+               if (i == j) {
+                  // x0,x1 are the same pixel, so compute combined coverage
+                  scanline[i] = scanline[i] + (stbtt_uint8) ((x1 - x0) * max_weight >> STBTT_FIXSHIFT);
+               } else {
+                  if (i >= 0) // add antialiasing for x0
+                     scanline[i] = scanline[i] + (stbtt_uint8) (((STBTT_FIX - (x0 & STBTT_FIXMASK)) * max_weight) >> STBTT_FIXSHIFT);
+                  else
+                     i = -1; // clip
+
+                  if (j < len) // add antialiasing for x1
+                     scanline[j] = scanline[j] + (stbtt_uint8) (((x1 & STBTT_FIXMASK) * max_weight) >> STBTT_FIXSHIFT);
+                  else
+                     j = len; // clip
+
+                  for (++i; i < j; ++i) // fill pixels between x0 and x1
+                     scanline[i] = scanline[i] + (stbtt_uint8) max_weight;
+               }
+            }
+         }
+      }
+
+      e = e->next;
+   }
+}
+
+static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
+{
+   stbtt__hheap hh = { 0, 0, 0 };
+   stbtt__active_edge *active = NULL;
+   int y,j=0;
+   int max_weight = (255 / vsubsample);  // weight per vertical scanline
+   int s; // vertical subsample index
+   unsigned char scanline_data[512], *scanline;
+
+   if (result->w > 512)
+      scanline = (unsigned char *) STBTT_malloc(result->w, userdata);
+   else
+      scanline = scanline_data;
+
+   y = off_y * vsubsample;
+   e[n].y0 = (off_y + result->h) * (float) vsubsample + 1;
+
+   while (j < result->h) {
+      STBTT_memset(scanline, 0, result->w);
+      for (s=0; s < vsubsample; ++s) {
+         // find center of pixel for this scanline
+         float scan_y = y + 0.5f;
+         stbtt__active_edge **step = &active;
+
+         // update all active edges;
+         // remove all active edges that terminate before the center of this scanline
+         while (*step) {
+            stbtt__active_edge * z = *step;
+            if (z->ey <= scan_y) {
+               *step = z->next; // delete from list
+               STBTT_assert(z->direction);
+               z->direction = 0;
+               stbtt__hheap_free(&hh, z);
+            } else {
+               z->x += z->dx; // advance to position for current scanline
+               step = &((*step)->next); // advance through list
+            }
+         }
+
+         // resort the list if needed
+         for(;;) {
+            int changed=0;
+            step = &active;
+            while (*step && (*step)->next) {
+               if ((*step)->x > (*step)->next->x) {
+                  stbtt__active_edge *t = *step;
+                  stbtt__active_edge *q = t->next;
+
+                  t->next = q->next;
+                  q->next = t;
+                  *step = q;
+                  changed = 1;
+               }
+               step = &(*step)->next;
+            }
+            if (!changed) break;
+         }
+
+         // insert all edges that start before the center of this scanline -- omit ones that also end on this scanline
+         while (e->y0 <= scan_y) {
+            if (e->y1 > scan_y) {
+               stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y, userdata);
+               if (z != NULL) {
+                  // find insertion point
+                  if (active == NULL)
+                     active = z;
+                  else if (z->x < active->x) {
+                     // insert at front
+                     z->next = active;
+                     active = z;
+                  } else {
+                     // find thing to insert AFTER
+                     stbtt__active_edge *p = active;
+                     while (p->next && p->next->x < z->x)
+                        p = p->next;
+                     // at this point, p->next->x is NOT < z->x
+                     z->next = p->next;
+                     p->next = z;
+                  }
+               }
+            }
+            ++e;
+         }
+
+         // now process all active edges in XOR fashion
+         if (active)
+            stbtt__fill_active_edges(scanline, result->w, active, max_weight);
+
+         ++y;
+      }
+      STBTT_memcpy(result->pixels + j * result->stride, scanline, result->w);
+      ++j;
+   }
+
+   stbtt__hheap_cleanup(&hh, userdata);
+
+   if (scanline != scanline_data)
+      STBTT_free(scanline, userdata);
+}
+
+#elif STBTT_RASTERIZER_VERSION == 2
+
+// the edge passed in here does not cross the vertical line at x or the vertical line at x+1
+// (i.e. it has already been clipped to those)
+static void stbtt__handle_clipped_edge(float *scanline, int x, stbtt__active_edge *e, float x0, float y0, float x1, float y1)
+{
+   if (y0 == y1) return;
+   STBTT_assert(y0 < y1);
+   STBTT_assert(e->sy <= e->ey);
+   if (y0 > e->ey) return;
+   if (y1 < e->sy) return;
+   if (y0 < e->sy) {
+      x0 += (x1-x0) * (e->sy - y0) / (y1-y0);
+      y0 = e->sy;
+   }
+   if (y1 > e->ey) {
+      x1 += (x1-x0) * (e->ey - y1) / (y1-y0);
+      y1 = e->ey;
+   }
+
+   if (x0 == x)
+      STBTT_assert(x1 <= x+1);
+   else if (x0 == x+1)
+      STBTT_assert(x1 >= x);
+   else if (x0 <= x)
+      STBTT_assert(x1 <= x);
+   else if (x0 >= x+1)
+      STBTT_assert(x1 >= x+1);
+   else
+      STBTT_assert(x1 >= x && x1 <= x+1);
+
+   if (x0 <= x && x1 <= x)
+      scanline[x] += e->direction * (y1-y0);
+   else if (x0 >= x+1 && x1 >= x+1)
+      ;
+   else {
+      STBTT_assert(x0 >= x && x0 <= x+1 && x1 >= x && x1 <= x+1);
+      scanline[x] += e->direction * (y1-y0) * (1-((x0-x)+(x1-x))/2); // coverage = 1 - average x position
+   }
+}
+
+static void stbtt__fill_active_edges_new(float *scanline, float *scanline_fill, int len, stbtt__active_edge *e, float y_top)
+{
+   float y_bottom = y_top+1;
+
+   while (e) {
+      // brute force every pixel
+
+      // compute intersection points with top & bottom
+      STBTT_assert(e->ey >= y_top);
+
+      if (e->fdx == 0) {
+         float x0 = e->fx;
+         if (x0 < len) {
+            if (x0 >= 0) {
+               stbtt__handle_clipped_edge(scanline,(int) x0,e, x0,y_top, x0,y_bottom);
+               stbtt__handle_clipped_edge(scanline_fill-1,(int) x0+1,e, x0,y_top, x0,y_bottom);
+            } else {
+               stbtt__handle_clipped_edge(scanline_fill-1,0,e, x0,y_top, x0,y_bottom);
+            }
+         }
+      } else {
+         float x0 = e->fx;
+         float dx = e->fdx;
+         float xb = x0 + dx;
+         float x_top, x_bottom;
+         float sy0,sy1;
+         float dy = e->fdy;
+         STBTT_assert(e->sy <= y_bottom && e->ey >= y_top);
+
+         // compute endpoints of line segment clipped to this scanline (if the
+         // line segment starts on this scanline. x0 is the intersection of the
+         // line with y_top, but that may be off the line segment.
+         if (e->sy > y_top) {
+            x_top = x0 + dx * (e->sy - y_top);
+            sy0 = e->sy;
+         } else {
+            x_top = x0;
+            sy0 = y_top;
+         }
+         if (e->ey < y_bottom) {
+            x_bottom = x0 + dx * (e->ey - y_top);
+            sy1 = e->ey;
+         } else {
+            x_bottom = xb;
+            sy1 = y_bottom;
+         }
+
+         if (x_top >= 0 && x_bottom >= 0 && x_top < len && x_bottom < len) {
+            // from here on, we don't have to range check x values
+
+            if ((int) x_top == (int) x_bottom) {
+               float height;
+               // simple case, only spans one pixel
+               int x = (int) x_top;
+               height = sy1 - sy0;
+               STBTT_assert(x >= 0 && x < len);
+               scanline[x] += e->direction * (1-((x_top - x) + (x_bottom-x))/2)  * height;
+               scanline_fill[x] += e->direction * height; // everything right of this pixel is filled
+            } else {
+               int x,x1,x2;
+               float y_crossing, step, sign, area;
+               // covers 2+ pixels
+               if (x_top > x_bottom) {
+                  // flip scanline vertically; signed area is the same
+                  float t;
+                  sy0 = y_bottom - (sy0 - y_top);
+                  sy1 = y_bottom - (sy1 - y_top);
+                  t = sy0, sy0 = sy1, sy1 = t;
+                  t = x_bottom, x_bottom = x_top, x_top = t;
+                  dx = -dx;
+                  dy = -dy;
+                  t = x0, x0 = xb, xb = t;
+               }
+
+               x1 = (int) x_top;
+               x2 = (int) x_bottom;
+               // compute intersection with y axis at x1+1
+               y_crossing = (x1+1 - x0) * dy + y_top;
+
+               sign = e->direction;
+               // area of the rectangle covered from y0..y_crossing
+               area = sign * (y_crossing-sy0);
+               // area of the triangle (x_top,y0), (x+1,y0), (x+1,y_crossing)
+               scanline[x1] += area * (1-((x_top - x1)+(x1+1-x1))/2);
+
+               step = sign * dy;
+               for (x = x1+1; x < x2; ++x) {
+                  scanline[x] += area + step/2;
+                  area += step;
+               }
+               y_crossing += dy * (x2 - (x1+1));
+
+               STBTT_assert(STBTT_fabs(area) <= 1.01f);
+
+               scanline[x2] += area + sign * (1-((x2-x2)+(x_bottom-x2))/2) * (sy1-y_crossing);
+
+               scanline_fill[x2] += sign * (sy1-sy0);
+            }
+         } else {
+            // if edge goes outside of box we're drawing, we require
+            // clipping logic. since this does not match the intended use
+            // of this library, we use a different, very slow brute
+            // force implementation
+            int x;
+            for (x=0; x < len; ++x) {
+               // cases:
+               //
+               // there can be up to two intersections with the pixel. any intersection
+               // with left or right edges can be handled by splitting into two (or three)
+               // regions. intersections with top & bottom do not necessitate case-wise logic.
+               //
+               // the old way of doing this found the intersections with the left & right edges,
+               // then used some simple logic to produce up to three segments in sorted order
+               // from top-to-bottom. however, this had a problem: if an x edge was epsilon
+               // across the x border, then the corresponding y position might not be distinct
+               // from the other y segment, and it might ignored as an empty segment. to avoid
+               // that, we need to explicitly produce segments based on x positions.
+
+               // rename variables to clearly-defined pairs
+               float y0 = y_top;
+               float x1 = (float) (x);
+               float x2 = (float) (x+1);
+               float x3 = xb;
+               float y3 = y_bottom;
+
+               // x = e->x + e->dx * (y-y_top)
+               // (y-y_top) = (x - e->x) / e->dx
+               // y = (x - e->x) / e->dx + y_top
+               float y1 = (x - x0) / dx + y_top;
+               float y2 = (x+1 - x0) / dx + y_top;
+
+               if (x0 < x1 && x3 > x2) {         // three segments descending down-right
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
+                  stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x2,y2);
+                  stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
+               } else if (x3 < x1 && x0 > x2) {  // three segments descending down-left
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
+                  stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x1,y1);
+                  stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
+               } else if (x0 < x1 && x3 > x1) {  // two segments across x, down-right
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
+                  stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
+               } else if (x3 < x1 && x0 > x1) {  // two segments across x, down-left
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x1,y1);
+                  stbtt__handle_clipped_edge(scanline,x,e, x1,y1, x3,y3);
+               } else if (x0 < x2 && x3 > x2) {  // two segments across x+1, down-right
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
+                  stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
+               } else if (x3 < x2 && x0 > x2) {  // two segments across x+1, down-left
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x2,y2);
+                  stbtt__handle_clipped_edge(scanline,x,e, x2,y2, x3,y3);
+               } else {  // one segment
+                  stbtt__handle_clipped_edge(scanline,x,e, x0,y0, x3,y3);
+               }
+            }
+         }
+      }
+      e = e->next;
+   }
+}
+
+// directly AA rasterize edges w/o supersampling
+static void stbtt__rasterize_sorted_edges(stbtt__bitmap *result, stbtt__edge *e, int n, int vsubsample, int off_x, int off_y, void *userdata)
+{
+   stbtt__hheap hh = { 0, 0, 0 };
+   stbtt__active_edge *active = NULL;
+   int y,j=0, i;
+   float scanline_data[129], *scanline, *scanline2;
+
+   STBTT__NOTUSED(vsubsample);
+
+   if (result->w > 64)
+      scanline = (float *) STBTT_malloc((result->w*2+1) * sizeof(float), userdata);
+   else
+      scanline = scanline_data;
+
+   scanline2 = scanline + result->w;
+
+   y = off_y;
+   e[n].y0 = (float) (off_y + result->h) + 1;
+
+   while (j < result->h) {
+      // find center of pixel for this scanline
+      float scan_y_top    = y + 0.0f;
+      float scan_y_bottom = y + 1.0f;
+      stbtt__active_edge **step = &active;
+
+      STBTT_memset(scanline , 0, result->w*sizeof(scanline[0]));
+      STBTT_memset(scanline2, 0, (result->w+1)*sizeof(scanline[0]));
+
+      // update all active edges;
+      // remove all active edges that terminate before the top of this scanline
+      while (*step) {
+         stbtt__active_edge * z = *step;
+         if (z->ey <= scan_y_top) {
+            *step = z->next; // delete from list
+            STBTT_assert(z->direction);
+            z->direction = 0;
+            stbtt__hheap_free(&hh, z);
+         } else {
+            step = &((*step)->next); // advance through list
+         }
+      }
+
+      // insert all edges that start before the bottom of this scanline
+      while (e->y0 <= scan_y_bottom) {
+         if (e->y0 != e->y1) {
+            stbtt__active_edge *z = stbtt__new_active(&hh, e, off_x, scan_y_top, userdata);
+            if (z != NULL) {
+               if (j == 0 && off_y != 0) {
+                  if (z->ey < scan_y_top) {
+                     // this can happen due to subpixel positioning and some kind of fp rounding error i think
+                     z->ey = scan_y_top;
+                  }
+               }
+               STBTT_assert(z->ey >= scan_y_top); // if we get really unlucky a tiny bit of an edge can be out of bounds
+               // insert at front
+               z->next = active;
+               active = z;
+            }
+         }
+         ++e;
+      }
+
+      // now process all active edges
+      if (active)
+         stbtt__fill_active_edges_new(scanline, scanline2+1, result->w, active, scan_y_top);
+
+      {
+         float sum = 0;
+         for (i=0; i < result->w; ++i) {
+            float k;
+            int m;
+            sum += scanline2[i];
+            k = scanline[i] + sum;
+            k = (float) STBTT_fabs(k)*255 + 0.5f;
+            m = (int) k;
+            if (m > 255) m = 255;
+            result->pixels[j*result->stride + i] = (unsigned char) m;
+         }
+      }
+      // advance all the edges
+      step = &active;
+      while (*step) {
+         stbtt__active_edge *z = *step;
+         z->fx += z->fdx; // advance to position for current scanline
+         step = &((*step)->next); // advance through list
+      }
+
+      ++y;
+      ++j;
+   }
+
+   stbtt__hheap_cleanup(&hh, userdata);
+
+   if (scanline != scanline_data)
+      STBTT_free(scanline, userdata);
+}
+#else
+#error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+#endif
+
+#define STBTT__COMPARE(a,b)  ((a)->y0 < (b)->y0)
+
+static void stbtt__sort_edges_ins_sort(stbtt__edge *p, int n)
+{
+   int i,j;
+   for (i=1; i < n; ++i) {
+      stbtt__edge t = p[i], *a = &t;
+      j = i;
+      while (j > 0) {
+         stbtt__edge *b = &p[j-1];
+         int c = STBTT__COMPARE(a,b);
+         if (!c) break;
+         p[j] = p[j-1];
+         --j;
+      }
+      if (i != j)
+         p[j] = t;
+   }
+}
+
+static void stbtt__sort_edges_quicksort(stbtt__edge *p, int n)
+{
+   /* threshold for transitioning to insertion sort */
+   while (n > 12) {
+      stbtt__edge t;
+      int c01,c12,c,m,i,j;
+
+      /* compute median of three */
+      m = n >> 1;
+      c01 = STBTT__COMPARE(&p[0],&p[m]);
+      c12 = STBTT__COMPARE(&p[m],&p[n-1]);
+      /* if 0 >= mid >= end, or 0 < mid < end, then use mid */
+      if (c01 != c12) {
+         /* otherwise, we'll need to swap something else to middle */
+         int z;
+         c = STBTT__COMPARE(&p[0],&p[n-1]);
+         /* 0>mid && mid<n:  0>n => n; 0<n => 0 */
+         /* 0<mid && mid>n:  0>n => 0; 0<n => n */
+         z = (c == c12) ? 0 : n-1;
+         t = p[z];
+         p[z] = p[m];
+         p[m] = t;
+      }
+      /* now p[m] is the median-of-three */
+      /* swap it to the beginning so it won't move around */
+      t = p[0];
+      p[0] = p[m];
+      p[m] = t;
+
+      /* partition loop */
+      i=1;
+      j=n-1;
+      for(;;) {
+         /* handling of equality is crucial here */
+         /* for sentinels & efficiency with duplicates */
+         for (;;++i) {
+            if (!STBTT__COMPARE(&p[i], &p[0])) break;
+         }
+         for (;;--j) {
+            if (!STBTT__COMPARE(&p[0], &p[j])) break;
+         }
+         /* make sure we haven't crossed */
+         if (i >= j) break;
+         t = p[i];
+         p[i] = p[j];
+         p[j] = t;
+
+         ++i;
+         --j;
+      }
+      /* recurse on smaller side, iterate on larger */
+      if (j < (n-i)) {
+         stbtt__sort_edges_quicksort(p,j);
+         p = p+i;
+         n = n-i;
+      } else {
+         stbtt__sort_edges_quicksort(p+i, n-i);
+         n = j;
+      }
+   }
+}
+
+static void stbtt__sort_edges(stbtt__edge *p, int n)
+{
+   stbtt__sort_edges_quicksort(p, n);
+   stbtt__sort_edges_ins_sort(p, n);
+}
+
+typedef struct
+{
+   float x,y;
+} stbtt__point;
+
+static void stbtt__rasterize(stbtt__bitmap *result, stbtt__point *pts, int *wcount, int windings, float scale_x, float scale_y, float shift_x, float shift_y, int off_x, int off_y, int invert, void *userdata)
+{
+   float y_scale_inv = invert ? -scale_y : scale_y;
+   stbtt__edge *e;
+   int n,i,j,k,m;
+#if STBTT_RASTERIZER_VERSION == 1
+   int vsubsample = result->h < 8 ? 15 : 5;
+#elif STBTT_RASTERIZER_VERSION == 2
+   int vsubsample = 1;
+#else
+   #error "Unrecognized value of STBTT_RASTERIZER_VERSION"
+#endif
+   // vsubsample should divide 255 evenly; otherwise we won't reach full opacity
+
+   // now we have to blow out the windings into explicit edge lists
+   n = 0;
+   for (i=0; i < windings; ++i)
+      n += wcount[i];
+
+   e = (stbtt__edge *) STBTT_malloc(sizeof(*e) * (n+1), userdata); // add an extra one as a sentinel
+   if (e == 0) return;
+   n = 0;
+
+   m=0;
+   for (i=0; i < windings; ++i) {
+      stbtt__point *p = pts + m;
+      m += wcount[i];
+      j = wcount[i]-1;
+      for (k=0; k < wcount[i]; j=k++) {
+         int a=k,b=j;
+         // skip the edge if horizontal
+         if (p[j].y == p[k].y)
+            continue;
+         // add edge from j to k to the list
+         e[n].invert = 0;
+         if (invert ? p[j].y > p[k].y : p[j].y < p[k].y) {
+            e[n].invert = 1;
+            a=j,b=k;
+         }
+         e[n].x0 = p[a].x * scale_x + shift_x;
+         e[n].y0 = (p[a].y * y_scale_inv + shift_y) * vsubsample;
+         e[n].x1 = p[b].x * scale_x + shift_x;
+         e[n].y1 = (p[b].y * y_scale_inv + shift_y) * vsubsample;
+         ++n;
+      }
+   }
+
+   // now sort the edges by their highest point (should snap to integer, and then by x)
+   //STBTT_sort(e, n, sizeof(e[0]), stbtt__edge_compare);
+   stbtt__sort_edges(e, n);
+
+   // now, traverse the scanlines and find the intersections on each scanline, use xor winding rule
+   stbtt__rasterize_sorted_edges(result, e, n, vsubsample, off_x, off_y, userdata);
+
+   STBTT_free(e, userdata);
+}
+
+static void stbtt__add_point(stbtt__point *points, int n, float x, float y)
+{
+   if (!points) return; // during first pass, it's unallocated
+   points[n].x = x;
+   points[n].y = y;
+}
+
+// tessellate until threshold p is happy... @TODO warped to compensate for non-linear stretching
+static int stbtt__tesselate_curve(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float objspace_flatness_squared, int n)
+{
+   // midpoint
+   float mx = (x0 + 2*x1 + x2)/4;
+   float my = (y0 + 2*y1 + y2)/4;
+   // versus directly drawn line
+   float dx = (x0+x2)/2 - mx;
+   float dy = (y0+y2)/2 - my;
+   if (n > 16) // 65536 segments on one curve better be enough!
+      return 1;
+   if (dx*dx+dy*dy > objspace_flatness_squared) { // half-pixel error allowed... need to be smaller if AA
+      stbtt__tesselate_curve(points, num_points, x0,y0, (x0+x1)/2.0f,(y0+y1)/2.0f, mx,my, objspace_flatness_squared,n+1);
+      stbtt__tesselate_curve(points, num_points, mx,my, (x1+x2)/2.0f,(y1+y2)/2.0f, x2,y2, objspace_flatness_squared,n+1);
+   } else {
+      stbtt__add_point(points, *num_points,x2,y2);
+      *num_points = *num_points+1;
+   }
+   return 1;
+}
+
+static void stbtt__tesselate_cubic(stbtt__point *points, int *num_points, float x0, float y0, float x1, float y1, float x2, float y2, float x3, float y3, float objspace_flatness_squared, int n)
+{
+   // @TODO this "flatness" calculation is just made-up nonsense that seems to work well enough
+   float dx0 = x1-x0;
+   float dy0 = y1-y0;
+   float dx1 = x2-x1;
+   float dy1 = y2-y1;
+   float dx2 = x3-x2;
+   float dy2 = y3-y2;
+   float dx = x3-x0;
+   float dy = y3-y0;
+   float longlen = (float) (STBTT_sqrt(dx0*dx0+dy0*dy0)+STBTT_sqrt(dx1*dx1+dy1*dy1)+STBTT_sqrt(dx2*dx2+dy2*dy2));
+   float shortlen = (float) STBTT_sqrt(dx*dx+dy*dy);
+   float flatness_squared = longlen*longlen-shortlen*shortlen;
+
+   if (n > 16) // 65536 segments on one curve better be enough!
+      return;
+
+   if (flatness_squared > objspace_flatness_squared) {
+      float x01 = (x0+x1)/2;
+      float y01 = (y0+y1)/2;
+      float x12 = (x1+x2)/2;
+      float y12 = (y1+y2)/2;
+      float x23 = (x2+x3)/2;
+      float y23 = (y2+y3)/2;
+
+      float xa = (x01+x12)/2;
+      float ya = (y01+y12)/2;
+      float xb = (x12+x23)/2;
+      float yb = (y12+y23)/2;
+
+      float mx = (xa+xb)/2;
+      float my = (ya+yb)/2;
+
+      stbtt__tesselate_cubic(points, num_points, x0,y0, x01,y01, xa,ya, mx,my, objspace_flatness_squared,n+1);
+      stbtt__tesselate_cubic(points, num_points, mx,my, xb,yb, x23,y23, x3,y3, objspace_flatness_squared,n+1);
+   } else {
+      stbtt__add_point(points, *num_points,x3,y3);
+      *num_points = *num_points+1;
+   }
+}
+
+// returns number of contours
+static stbtt__point *stbtt_FlattenCurves(stbtt_vertex *vertices, int num_verts, float objspace_flatness, int **contour_lengths, int *num_contours, void *userdata)
+{
+   stbtt__point *points=0;
+   int num_points=0;
+
+   float objspace_flatness_squared = objspace_flatness * objspace_flatness;
+   int i,n=0,start=0, pass;
+
+   // count how many "moves" there are to get the contour count
+   for (i=0; i < num_verts; ++i)
+      if (vertices[i].type == STBTT_vmove)
+         ++n;
+
+   *num_contours = n;
+   if (n == 0) return 0;
+
+   *contour_lengths = (int *) STBTT_malloc(sizeof(**contour_lengths) * n, userdata);
+
+   if (*contour_lengths == 0) {
+      *num_contours = 0;
+      return 0;
+   }
+
+   // make two passes through the points so we don't need to realloc
+   for (pass=0; pass < 2; ++pass) {
+      float x=0,y=0;
+      if (pass == 1) {
+         points = (stbtt__point *) STBTT_malloc(num_points * sizeof(points[0]), userdata);
+         if (points == NULL) goto error;
+      }
+      num_points = 0;
+      n= -1;
+      for (i=0; i < num_verts; ++i) {
+         switch (vertices[i].type) {
+            case STBTT_vmove:
+               // start the next contour
+               if (n >= 0)
+                  (*contour_lengths)[n] = num_points - start;
+               ++n;
+               start = num_points;
+
+               x = vertices[i].x, y = vertices[i].y;
+               stbtt__add_point(points, num_points++, x,y);
+               break;
+            case STBTT_vline:
+               x = vertices[i].x, y = vertices[i].y;
+               stbtt__add_point(points, num_points++, x, y);
+               break;
+            case STBTT_vcurve:
+               stbtt__tesselate_curve(points, &num_points, x,y,
+                                        vertices[i].cx, vertices[i].cy,
+                                        vertices[i].x,  vertices[i].y,
+                                        objspace_flatness_squared, 0);
+               x = vertices[i].x, y = vertices[i].y;
+               break;
+            case STBTT_vcubic:
+               stbtt__tesselate_cubic(points, &num_points, x,y,
+                                        vertices[i].cx, vertices[i].cy,
+                                        vertices[i].cx1, vertices[i].cy1,
+                                        vertices[i].x,  vertices[i].y,
+                                        objspace_flatness_squared, 0);
+               x = vertices[i].x, y = vertices[i].y;
+               break;
+         }
+      }
+      (*contour_lengths)[n] = num_points - start;
+   }
+
+   return points;
+error:
+   STBTT_free(points, userdata);
+   STBTT_free(*contour_lengths, userdata);
+   *contour_lengths = 0;
+   *num_contours = 0;
+   return NULL;
+}
+
+STBTT_DEF void stbtt_Rasterize(stbtt__bitmap *result, float flatness_in_pixels, stbtt_vertex *vertices, int num_verts, float scale_x, float scale_y, float shift_x, float shift_y, int x_off, int y_off, int invert, void *userdata)
+{
+   float scale            = scale_x > scale_y ? scale_y : scale_x;
+   int winding_count      = 0;
+   int *winding_lengths   = NULL;
+   stbtt__point *windings = stbtt_FlattenCurves(vertices, num_verts, flatness_in_pixels / scale, &winding_lengths, &winding_count, userdata);
+   if (windings) {
+      stbtt__rasterize(result, windings, winding_lengths, winding_count, scale_x, scale_y, shift_x, shift_y, x_off, y_off, invert, userdata);
+      STBTT_free(winding_lengths, userdata);
+      STBTT_free(windings, userdata);
+   }
+}
+
+STBTT_DEF void stbtt_FreeBitmap(unsigned char *bitmap, void *userdata)
+{
+   STBTT_free(bitmap, userdata);
+}
+
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int glyph, int *width, int *height, int *xoff, int *yoff)
+{
+   int ix0,iy0,ix1,iy1;
+   stbtt__bitmap gbm;
+   stbtt_vertex *vertices;
+   int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
+
+   if (scale_x == 0) scale_x = scale_y;
+   if (scale_y == 0) {
+      if (scale_x == 0) {
+         STBTT_free(vertices, info->userdata);
+         return NULL;
+      }
+      scale_y = scale_x;
+   }
+
+   stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,&ix1,&iy1);
+
+   // now we get the size
+   gbm.w = (ix1 - ix0);
+   gbm.h = (iy1 - iy0);
+   gbm.pixels = NULL; // in case we error
+
+   if (width ) *width  = gbm.w;
+   if (height) *height = gbm.h;
+   if (xoff  ) *xoff   = ix0;
+   if (yoff  ) *yoff   = iy0;
+
+   if (gbm.w && gbm.h) {
+      gbm.pixels = (unsigned char *) STBTT_malloc(gbm.w * gbm.h, info->userdata);
+      if (gbm.pixels) {
+         gbm.stride = gbm.w;
+
+         stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0, iy0, 1, info->userdata);
+      }
+   }
+   STBTT_free(vertices, info->userdata);
+   return gbm.pixels;
+}
+
+STBTT_DEF unsigned char *stbtt_GetGlyphBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int glyph, int *width, int *height, int *xoff, int *yoff)
+{
+   return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y, 0.0f, 0.0f, glyph, width, height, xoff, yoff);
+}
+
+STBTT_DEF void stbtt_MakeGlyphBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int glyph)
+{
+   int ix0,iy0;
+   stbtt_vertex *vertices;
+   int num_verts = stbtt_GetGlyphShape(info, glyph, &vertices);
+   stbtt__bitmap gbm;
+
+   stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale_x, scale_y, shift_x, shift_y, &ix0,&iy0,0,0);
+   gbm.pixels = output;
+   gbm.w = out_w;
+   gbm.h = out_h;
+   gbm.stride = out_stride;
+
+   if (gbm.w && gbm.h)
+      stbtt_Rasterize(&gbm, 0.35f, vertices, num_verts, scale_x, scale_y, shift_x, shift_y, ix0,iy0, 1, info->userdata);
+
+   STBTT_free(vertices, info->userdata);
+}
+
+STBTT_DEF void stbtt_MakeGlyphBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int glyph)
+{
+   stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, glyph);
+}
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmapSubpixel(const stbtt_fontinfo *info, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
+{
+   return stbtt_GetGlyphBitmapSubpixel(info, scale_x, scale_y,shift_x,shift_y, stbtt_FindGlyphIndex(info,codepoint), width,height,xoff,yoff);
+}
+
+STBTT_DEF void stbtt_MakeCodepointBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int oversample_x, int oversample_y, float *sub_x, float *sub_y, int codepoint)
+{
+   stbtt_MakeGlyphBitmapSubpixelPrefilter(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, oversample_x, oversample_y, sub_x, sub_y, stbtt_FindGlyphIndex(info,codepoint));
+}
+
+STBTT_DEF void stbtt_MakeCodepointBitmapSubpixel(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int codepoint)
+{
+   stbtt_MakeGlyphBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, shift_x, shift_y, stbtt_FindGlyphIndex(info,codepoint));
+}
+
+STBTT_DEF unsigned char *stbtt_GetCodepointBitmap(const stbtt_fontinfo *info, float scale_x, float scale_y, int codepoint, int *width, int *height, int *xoff, int *yoff)
+{
+   return stbtt_GetCodepointBitmapSubpixel(info, scale_x, scale_y, 0.0f,0.0f, codepoint, width,height,xoff,yoff);
+}
+
+STBTT_DEF void stbtt_MakeCodepointBitmap(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, int codepoint)
+{
+   stbtt_MakeCodepointBitmapSubpixel(info, output, out_w, out_h, out_stride, scale_x, scale_y, 0.0f,0.0f, codepoint);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// bitmap baking
+//
+// This is SUPER-CRAPPY packing to keep source code small
+
+static int stbtt_BakeFontBitmap_internal(unsigned char *data, int offset,  // font location (use offset=0 for plain .ttf)
+                                float pixel_height,                     // height of font in pixels
+                                unsigned char *pixels, int pw, int ph,  // bitmap to be filled in
+                                int first_char, int num_chars,          // characters to bake
+                                stbtt_bakedchar *chardata)
+{
+   float scale;
+   int x,y,bottom_y, i;
+   stbtt_fontinfo f;
+   f.userdata = NULL;
+   if (!stbtt_InitFont(&f, data, offset))
+      return -1;
+   STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
+   x=y=1;
+   bottom_y = 1;
+
+   scale = stbtt_ScaleForPixelHeight(&f, pixel_height);
+
+   for (i=0; i < num_chars; ++i) {
+      int advance, lsb, x0,y0,x1,y1,gw,gh;
+      int g = stbtt_FindGlyphIndex(&f, first_char + i);
+      stbtt_GetGlyphHMetrics(&f, g, &advance, &lsb);
+      stbtt_GetGlyphBitmapBox(&f, g, scale,scale, &x0,&y0,&x1,&y1);
+      gw = x1-x0;
+      gh = y1-y0;
+      if (x + gw + 1 >= pw)
+         y = bottom_y, x = 1; // advance to next row
+      if (y + gh + 1 >= ph) // check if it fits vertically AFTER potentially moving to next row
+         return -i;
+      STBTT_assert(x+gw < pw);
+      STBTT_assert(y+gh < ph);
+      stbtt_MakeGlyphBitmap(&f, pixels+x+y*pw, gw,gh,pw, scale,scale, g);
+      chardata[i].x0 = (stbtt_int16) x;
+      chardata[i].y0 = (stbtt_int16) y;
+      chardata[i].x1 = (stbtt_int16) (x + gw);
+      chardata[i].y1 = (stbtt_int16) (y + gh);
+      chardata[i].xadvance = scale * advance;
+      chardata[i].xoff     = (float) x0;
+      chardata[i].yoff     = (float) y0;
+      x = x + gw + 1;
+      if (y+gh+1 > bottom_y)
+         bottom_y = y+gh+1;
+   }
+   return bottom_y;
+}
+
+STBTT_DEF void stbtt_GetBakedQuad(const stbtt_bakedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int opengl_fillrule)
+{
+   float d3d_bias = opengl_fillrule ? 0 : -0.5f;
+   float ipw = 1.0f / pw, iph = 1.0f / ph;
+   const stbtt_bakedchar *b = chardata + char_index;
+   int round_x = STBTT_ifloor((*xpos + b->xoff) + 0.5f);
+   int round_y = STBTT_ifloor((*ypos + b->yoff) + 0.5f);
+
+   q->x0 = round_x + d3d_bias;
+   q->y0 = round_y + d3d_bias;
+   q->x1 = round_x + b->x1 - b->x0 + d3d_bias;
+   q->y1 = round_y + b->y1 - b->y0 + d3d_bias;
+
+   q->s0 = b->x0 * ipw;
+   q->t0 = b->y0 * iph;
+   q->s1 = b->x1 * ipw;
+   q->t1 = b->y1 * iph;
+
+   *xpos += b->xadvance;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// rectangle packing replacement routines if you don't have stb_rect_pack.h
+//
+
+#ifndef STB_RECT_PACK_VERSION
+
+typedef int stbrp_coord;
+
+////////////////////////////////////////////////////////////////////////////////////
+//                                                                                //
+//                                                                                //
+// COMPILER WARNING ?!?!?                                                         //
+//                                                                                //
+//                                                                                //
+// if you get a compile warning due to these symbols being defined more than      //
+// once, move #include "stb_rect_pack.h" before #include "stb_truetype.h"         //
+//                                                                                //
+////////////////////////////////////////////////////////////////////////////////////
+
+typedef struct
+{
+   int width,height;
+   int x,y,bottom_y;
+} stbrp_context;
+
+typedef struct
+{
+   unsigned char x;
+} stbrp_node;
+
+struct stbrp_rect
+{
+   stbrp_coord x,y;
+   int id,w,h,was_packed;
+};
+
+static void stbrp_init_target(stbrp_context *con, int pw, int ph, stbrp_node *nodes, int num_nodes)
+{
+   con->width  = pw;
+   con->height = ph;
+   con->x = 0;
+   con->y = 0;
+   con->bottom_y = 0;
+   STBTT__NOTUSED(nodes);
+   STBTT__NOTUSED(num_nodes);
+}
+
+static void stbrp_pack_rects(stbrp_context *con, stbrp_rect *rects, int num_rects)
+{
+   int i;
+   for (i=0; i < num_rects; ++i) {
+      if (con->x + rects[i].w > con->width) {
+         con->x = 0;
+         con->y = con->bottom_y;
+      }
+      if (con->y + rects[i].h > con->height)
+         break;
+      rects[i].x = con->x;
+      rects[i].y = con->y;
+      rects[i].was_packed = 1;
+      con->x += rects[i].w;
+      if (con->y + rects[i].h > con->bottom_y)
+         con->bottom_y = con->y + rects[i].h;
+   }
+   for (   ; i < num_rects; ++i)
+      rects[i].was_packed = 0;
+}
+#endif
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// bitmap baking
+//
+// This is SUPER-AWESOME (tm Ryan Gordon) packing using stb_rect_pack.h. If
+// stb_rect_pack.h isn't available, it uses the BakeFontBitmap strategy.
+
+STBTT_DEF int stbtt_PackBegin(stbtt_pack_context *spc, unsigned char *pixels, int pw, int ph, int stride_in_bytes, int padding, void *alloc_context)
+{
+   stbrp_context *context = (stbrp_context *) STBTT_malloc(sizeof(*context)            ,alloc_context);
+   int            num_nodes = pw - padding;
+   stbrp_node    *nodes   = (stbrp_node    *) STBTT_malloc(sizeof(*nodes  ) * num_nodes,alloc_context);
+
+   if (context == NULL || nodes == NULL) {
+      if (context != NULL) STBTT_free(context, alloc_context);
+      if (nodes   != NULL) STBTT_free(nodes  , alloc_context);
+      return 0;
+   }
+
+   spc->user_allocator_context = alloc_context;
+   spc->width = pw;
+   spc->height = ph;
+   spc->pixels = pixels;
+   spc->pack_info = context;
+   spc->nodes = nodes;
+   spc->padding = padding;
+   spc->stride_in_bytes = stride_in_bytes != 0 ? stride_in_bytes : pw;
+   spc->h_oversample = 1;
+   spc->v_oversample = 1;
+   spc->skip_missing = 0;
+
+   stbrp_init_target(context, pw-padding, ph-padding, nodes, num_nodes);
+
+   if (pixels)
+      STBTT_memset(pixels, 0, pw*ph); // background of 0 around pixels
+
+   return 1;
+}
+
+STBTT_DEF void stbtt_PackEnd  (stbtt_pack_context *spc)
+{
+   STBTT_free(spc->nodes    , spc->user_allocator_context);
+   STBTT_free(spc->pack_info, spc->user_allocator_context);
+}
+
+STBTT_DEF void stbtt_PackSetOversampling(stbtt_pack_context *spc, unsigned int h_oversample, unsigned int v_oversample)
+{
+   STBTT_assert(h_oversample <= STBTT_MAX_OVERSAMPLE);
+   STBTT_assert(v_oversample <= STBTT_MAX_OVERSAMPLE);
+   if (h_oversample <= STBTT_MAX_OVERSAMPLE)
+      spc->h_oversample = h_oversample;
+   if (v_oversample <= STBTT_MAX_OVERSAMPLE)
+      spc->v_oversample = v_oversample;
+}
+
+STBTT_DEF void stbtt_PackSetSkipMissingCodepoints(stbtt_pack_context *spc, int skip)
+{
+   spc->skip_missing = skip;
+}
+
+#define STBTT__OVER_MASK  (STBTT_MAX_OVERSAMPLE-1)
+
+static void stbtt__h_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
+{
+   unsigned char buffer[STBTT_MAX_OVERSAMPLE];
+   int safe_w = w - kernel_width;
+   int j;
+   STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
+   for (j=0; j < h; ++j) {
+      int i;
+      unsigned int total;
+      STBTT_memset(buffer, 0, kernel_width);
+
+      total = 0;
+
+      // make kernel_width a constant in common cases so compiler can optimize out the divide
+      switch (kernel_width) {
+         case 2:
+            for (i=0; i <= safe_w; ++i) {
+               total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+               pixels[i] = (unsigned char) (total / 2);
+            }
+            break;
+         case 3:
+            for (i=0; i <= safe_w; ++i) {
+               total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+               pixels[i] = (unsigned char) (total / 3);
+            }
+            break;
+         case 4:
+            for (i=0; i <= safe_w; ++i) {
+               total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+               pixels[i] = (unsigned char) (total / 4);
+            }
+            break;
+         case 5:
+            for (i=0; i <= safe_w; ++i) {
+               total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+               pixels[i] = (unsigned char) (total / 5);
+            }
+            break;
+         default:
+            for (i=0; i <= safe_w; ++i) {
+               total += pixels[i] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i];
+               pixels[i] = (unsigned char) (total / kernel_width);
+            }
+            break;
+      }
+
+      for (; i < w; ++i) {
+         STBTT_assert(pixels[i] == 0);
+         total -= buffer[i & STBTT__OVER_MASK];
+         pixels[i] = (unsigned char) (total / kernel_width);
+      }
+
+      pixels += stride_in_bytes;
+   }
+}
+
+static void stbtt__v_prefilter(unsigned char *pixels, int w, int h, int stride_in_bytes, unsigned int kernel_width)
+{
+   unsigned char buffer[STBTT_MAX_OVERSAMPLE];
+   int safe_h = h - kernel_width;
+   int j;
+   STBTT_memset(buffer, 0, STBTT_MAX_OVERSAMPLE); // suppress bogus warning from VS2013 -analyze
+   for (j=0; j < w; ++j) {
+      int i;
+      unsigned int total;
+      STBTT_memset(buffer, 0, kernel_width);
+
+      total = 0;
+
+      // make kernel_width a constant in common cases so compiler can optimize out the divide
+      switch (kernel_width) {
+         case 2:
+            for (i=0; i <= safe_h; ++i) {
+               total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+               pixels[i*stride_in_bytes] = (unsigned char) (total / 2);
+            }
+            break;
+         case 3:
+            for (i=0; i <= safe_h; ++i) {
+               total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+               pixels[i*stride_in_bytes] = (unsigned char) (total / 3);
+            }
+            break;
+         case 4:
+            for (i=0; i <= safe_h; ++i) {
+               total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+               pixels[i*stride_in_bytes] = (unsigned char) (total / 4);
+            }
+            break;
+         case 5:
+            for (i=0; i <= safe_h; ++i) {
+               total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+               pixels[i*stride_in_bytes] = (unsigned char) (total / 5);
+            }
+            break;
+         default:
+            for (i=0; i <= safe_h; ++i) {
+               total += pixels[i*stride_in_bytes] - buffer[i & STBTT__OVER_MASK];
+               buffer[(i+kernel_width) & STBTT__OVER_MASK] = pixels[i*stride_in_bytes];
+               pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
+            }
+            break;
+      }
+
+      for (; i < h; ++i) {
+         STBTT_assert(pixels[i*stride_in_bytes] == 0);
+         total -= buffer[i & STBTT__OVER_MASK];
+         pixels[i*stride_in_bytes] = (unsigned char) (total / kernel_width);
+      }
+
+      pixels += 1;
+   }
+}
+
+static float stbtt__oversample_shift(int oversample)
+{
+   if (!oversample)
+      return 0.0f;
+
+   // The prefilter is a box filter of width "oversample",
+   // which shifts phase by (oversample - 1)/2 pixels in
+   // oversampled space. We want to shift in the opposite
+   // direction to counter this.
+   return (float)-(oversample - 1) / (2.0f * (float)oversample);
+}
+
+// rects array must be big enough to accommodate all characters in the given ranges
+STBTT_DEF int stbtt_PackFontRangesGatherRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
+{
+   int i,j,k;
+   int missing_glyph_added = 0;
+
+   k=0;
+   for (i=0; i < num_ranges; ++i) {
+      float fh = ranges[i].font_size;
+      float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
+      ranges[i].h_oversample = (unsigned char) spc->h_oversample;
+      ranges[i].v_oversample = (unsigned char) spc->v_oversample;
+      for (j=0; j < ranges[i].num_chars; ++j) {
+         int x0,y0,x1,y1;
+         int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
+         int glyph = stbtt_FindGlyphIndex(info, codepoint);
+         if (glyph == 0 && (spc->skip_missing || missing_glyph_added)) {
+            rects[k].w = rects[k].h = 0;
+         } else {
+            stbtt_GetGlyphBitmapBoxSubpixel(info,glyph,
+                                            scale * spc->h_oversample,
+                                            scale * spc->v_oversample,
+                                            0,0,
+                                            &x0,&y0,&x1,&y1);
+            rects[k].w = (stbrp_coord) (x1-x0 + spc->padding + spc->h_oversample-1);
+            rects[k].h = (stbrp_coord) (y1-y0 + spc->padding + spc->v_oversample-1);
+            if (glyph == 0)
+               missing_glyph_added = 1;
+         }
+         ++k;
+      }
+   }
+
+   return k;
+}
+
+STBTT_DEF void stbtt_MakeGlyphBitmapSubpixelPrefilter(const stbtt_fontinfo *info, unsigned char *output, int out_w, int out_h, int out_stride, float scale_x, float scale_y, float shift_x, float shift_y, int prefilter_x, int prefilter_y, float *sub_x, float *sub_y, int glyph)
+{
+   stbtt_MakeGlyphBitmapSubpixel(info,
+                                 output,
+                                 out_w - (prefilter_x - 1),
+                                 out_h - (prefilter_y - 1),
+                                 out_stride,
+                                 scale_x,
+                                 scale_y,
+                                 shift_x,
+                                 shift_y,
+                                 glyph);
+
+   if (prefilter_x > 1)
+      stbtt__h_prefilter(output, out_w, out_h, out_stride, prefilter_x);
+
+   if (prefilter_y > 1)
+      stbtt__v_prefilter(output, out_w, out_h, out_stride, prefilter_y);
+
+   *sub_x = stbtt__oversample_shift(prefilter_x);
+   *sub_y = stbtt__oversample_shift(prefilter_y);
+}
+
+// rects array must be big enough to accommodate all characters in the given ranges
+STBTT_DEF int stbtt_PackFontRangesRenderIntoRects(stbtt_pack_context *spc, const stbtt_fontinfo *info, stbtt_pack_range *ranges, int num_ranges, stbrp_rect *rects)
+{
+   int i,j,k, missing_glyph = -1, return_value = 1;
+
+   // save current values
+   int old_h_over = spc->h_oversample;
+   int old_v_over = spc->v_oversample;
+
+   k = 0;
+   for (i=0; i < num_ranges; ++i) {
+      float fh = ranges[i].font_size;
+      float scale = fh > 0 ? stbtt_ScaleForPixelHeight(info, fh) : stbtt_ScaleForMappingEmToPixels(info, -fh);
+      float recip_h,recip_v,sub_x,sub_y;
+      spc->h_oversample = ranges[i].h_oversample;
+      spc->v_oversample = ranges[i].v_oversample;
+      recip_h = 1.0f / spc->h_oversample;
+      recip_v = 1.0f / spc->v_oversample;
+      sub_x = stbtt__oversample_shift(spc->h_oversample);
+      sub_y = stbtt__oversample_shift(spc->v_oversample);
+      for (j=0; j < ranges[i].num_chars; ++j) {
+         stbrp_rect *r = &rects[k];
+         if (r->was_packed && r->w != 0 && r->h != 0) {
+            stbtt_packedchar *bc = &ranges[i].chardata_for_range[j];
+            int advance, lsb, x0,y0,x1,y1;
+            int codepoint = ranges[i].array_of_unicode_codepoints == NULL ? ranges[i].first_unicode_codepoint_in_range + j : ranges[i].array_of_unicode_codepoints[j];
+            int glyph = stbtt_FindGlyphIndex(info, codepoint);
+            stbrp_coord pad = (stbrp_coord) spc->padding;
+
+            // pad on left and top
+            r->x += pad;
+            r->y += pad;
+            r->w -= pad;
+            r->h -= pad;
+            stbtt_GetGlyphHMetrics(info, glyph, &advance, &lsb);
+            stbtt_GetGlyphBitmapBox(info, glyph,
+                                    scale * spc->h_oversample,
+                                    scale * spc->v_oversample,
+                                    &x0,&y0,&x1,&y1);
+            stbtt_MakeGlyphBitmapSubpixel(info,
+                                          spc->pixels + r->x + r->y*spc->stride_in_bytes,
+                                          r->w - spc->h_oversample+1,
+                                          r->h - spc->v_oversample+1,
+                                          spc->stride_in_bytes,
+                                          scale * spc->h_oversample,
+                                          scale * spc->v_oversample,
+                                          0,0,
+                                          glyph);
+
+            if (spc->h_oversample > 1)
+               stbtt__h_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
+                                  r->w, r->h, spc->stride_in_bytes,
+                                  spc->h_oversample);
+
+            if (spc->v_oversample > 1)
+               stbtt__v_prefilter(spc->pixels + r->x + r->y*spc->stride_in_bytes,
+                                  r->w, r->h, spc->stride_in_bytes,
+                                  spc->v_oversample);
+
+            bc->x0       = (stbtt_int16)  r->x;
+            bc->y0       = (stbtt_int16)  r->y;
+            bc->x1       = (stbtt_int16) (r->x + r->w);
+            bc->y1       = (stbtt_int16) (r->y + r->h);
+            bc->xadvance =                scale * advance;
+            bc->xoff     =       (float)  x0 * recip_h + sub_x;
+            bc->yoff     =       (float)  y0 * recip_v + sub_y;
+            bc->xoff2    =                (x0 + r->w) * recip_h + sub_x;
+            bc->yoff2    =                (y0 + r->h) * recip_v + sub_y;
+
+            if (glyph == 0)
+               missing_glyph = j;
+         } else if (spc->skip_missing) {
+            return_value = 0;
+         } else if (r->was_packed && r->w == 0 && r->h == 0 && missing_glyph >= 0) {
+            ranges[i].chardata_for_range[j] = ranges[i].chardata_for_range[missing_glyph];
+         } else {
+            return_value = 0; // if any fail, report failure
+         }
+
+         ++k;
+      }
+   }
+
+   // restore original values
+   spc->h_oversample = old_h_over;
+   spc->v_oversample = old_v_over;
+
+   return return_value;
+}
+
+STBTT_DEF void stbtt_PackFontRangesPackRects(stbtt_pack_context *spc, stbrp_rect *rects, int num_rects)
+{
+   stbrp_pack_rects((stbrp_context *) spc->pack_info, rects, num_rects);
+}
+
+STBTT_DEF int stbtt_PackFontRanges(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, stbtt_pack_range *ranges, int num_ranges)
+{
+   stbtt_fontinfo info;
+   int i,j,n, return_value = 1;
+   //stbrp_context *context = (stbrp_context *) spc->pack_info;
+   stbrp_rect    *rects;
+
+   // flag all characters as NOT packed
+   for (i=0; i < num_ranges; ++i)
+      for (j=0; j < ranges[i].num_chars; ++j)
+         ranges[i].chardata_for_range[j].x0 =
+         ranges[i].chardata_for_range[j].y0 =
+         ranges[i].chardata_for_range[j].x1 =
+         ranges[i].chardata_for_range[j].y1 = 0;
+
+   n = 0;
+   for (i=0; i < num_ranges; ++i)
+      n += ranges[i].num_chars;
+
+   rects = (stbrp_rect *) STBTT_malloc(sizeof(*rects) * n, spc->user_allocator_context);
+   if (rects == NULL)
+      return 0;
+
+   info.userdata = spc->user_allocator_context;
+   stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata,font_index));
+
+   n = stbtt_PackFontRangesGatherRects(spc, &info, ranges, num_ranges, rects);
+
+   stbtt_PackFontRangesPackRects(spc, rects, n);
+
+   return_value = stbtt_PackFontRangesRenderIntoRects(spc, &info, ranges, num_ranges, rects);
+
+   STBTT_free(rects, spc->user_allocator_context);
+   return return_value;
+}
+
+STBTT_DEF int stbtt_PackFontRange(stbtt_pack_context *spc, const unsigned char *fontdata, int font_index, float font_size,
+            int first_unicode_codepoint_in_range, int num_chars_in_range, stbtt_packedchar *chardata_for_range)
+{
+   stbtt_pack_range range;
+   range.first_unicode_codepoint_in_range = first_unicode_codepoint_in_range;
+   range.array_of_unicode_codepoints = NULL;
+   range.num_chars                   = num_chars_in_range;
+   range.chardata_for_range          = chardata_for_range;
+   range.font_size                   = font_size;
+   return stbtt_PackFontRanges(spc, fontdata, font_index, &range, 1);
+}
+
+STBTT_DEF void stbtt_GetScaledFontVMetrics(const unsigned char *fontdata, int index, float size, float *ascent, float *descent, float *lineGap)
+{
+   int i_ascent, i_descent, i_lineGap;
+   float scale;
+   stbtt_fontinfo info;
+   stbtt_InitFont(&info, fontdata, stbtt_GetFontOffsetForIndex(fontdata, index));
+   scale = size > 0 ? stbtt_ScaleForPixelHeight(&info, size) : stbtt_ScaleForMappingEmToPixels(&info, -size);
+   stbtt_GetFontVMetrics(&info, &i_ascent, &i_descent, &i_lineGap);
+   *ascent  = (float) i_ascent  * scale;
+   *descent = (float) i_descent * scale;
+   *lineGap = (float) i_lineGap * scale;
+}
+
+STBTT_DEF void stbtt_GetPackedQuad(const stbtt_packedchar *chardata, int pw, int ph, int char_index, float *xpos, float *ypos, stbtt_aligned_quad *q, int align_to_integer)
+{
+   float ipw = 1.0f / pw, iph = 1.0f / ph;
+   const stbtt_packedchar *b = chardata + char_index;
+
+   if (align_to_integer) {
+      float x = (float) STBTT_ifloor((*xpos + b->xoff) + 0.5f);
+      float y = (float) STBTT_ifloor((*ypos + b->yoff) + 0.5f);
+      q->x0 = x;
+      q->y0 = y;
+      q->x1 = x + b->xoff2 - b->xoff;
+      q->y1 = y + b->yoff2 - b->yoff;
+   } else {
+      q->x0 = *xpos + b->xoff;
+      q->y0 = *ypos + b->yoff;
+      q->x1 = *xpos + b->xoff2;
+      q->y1 = *ypos + b->yoff2;
+   }
+
+   q->s0 = b->x0 * ipw;
+   q->t0 = b->y0 * iph;
+   q->s1 = b->x1 * ipw;
+   q->t1 = b->y1 * iph;
+
+   *xpos += b->xadvance;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// sdf computation
+//
+
+#define STBTT_min(a,b)  ((a) < (b) ? (a) : (b))
+#define STBTT_max(a,b)  ((a) < (b) ? (b) : (a))
+
+static int stbtt__ray_intersect_bezier(float orig[2], float ray[2], float q0[2], float q1[2], float q2[2], float hits[2][2])
+{
+   float q0perp = q0[1]*ray[0] - q0[0]*ray[1];
+   float q1perp = q1[1]*ray[0] - q1[0]*ray[1];
+   float q2perp = q2[1]*ray[0] - q2[0]*ray[1];
+   float roperp = orig[1]*ray[0] - orig[0]*ray[1];
+
+   float a = q0perp - 2*q1perp + q2perp;
+   float b = q1perp - q0perp;
+   float c = q0perp - roperp;
+
+   float s0 = 0., s1 = 0.;
+   int num_s = 0;
+
+   if (a != 0.0) {
+      float discr = b*b - a*c;
+      if (discr > 0.0) {
+         float rcpna = -1 / a;
+         float d = (float) STBTT_sqrt(discr);
+         s0 = (b+d) * rcpna;
+         s1 = (b-d) * rcpna;
+         if (s0 >= 0.0 && s0 <= 1.0)
+            num_s = 1;
+         if (d > 0.0 && s1 >= 0.0 && s1 <= 1.0) {
+            if (num_s == 0) s0 = s1;
+            ++num_s;
+         }
+      }
+   } else {
+      // 2*b*s + c = 0
+      // s = -c / (2*b)
+      s0 = c / (-2 * b);
+      if (s0 >= 0.0 && s0 <= 1.0)
+         num_s = 1;
+   }
+
+   if (num_s == 0)
+      return 0;
+   else {
+      float rcp_len2 = 1 / (ray[0]*ray[0] + ray[1]*ray[1]);
+      float rayn_x = ray[0] * rcp_len2, rayn_y = ray[1] * rcp_len2;
+
+      float q0d =   q0[0]*rayn_x +   q0[1]*rayn_y;
+      float q1d =   q1[0]*rayn_x +   q1[1]*rayn_y;
+      float q2d =   q2[0]*rayn_x +   q2[1]*rayn_y;
+      float rod = orig[0]*rayn_x + orig[1]*rayn_y;
+
+      float q10d = q1d - q0d;
+      float q20d = q2d - q0d;
+      float q0rd = q0d - rod;
+
+      hits[0][0] = q0rd + s0*(2.0f - 2.0f*s0)*q10d + s0*s0*q20d;
+      hits[0][1] = a*s0+b;
+
+      if (num_s > 1) {
+         hits[1][0] = q0rd + s1*(2.0f - 2.0f*s1)*q10d + s1*s1*q20d;
+         hits[1][1] = a*s1+b;
+         return 2;
+      } else {
+         return 1;
+      }
+   }
+}
+
+static int equal(float *a, float *b)
+{
+   return (a[0] == b[0] && a[1] == b[1]);
+}
+
+static int stbtt__compute_crossings_x(float x, float y, int nverts, stbtt_vertex *verts)
+{
+   int i;
+   float orig[2], ray[2] = { 1, 0 };
+   float y_frac;
+   int winding = 0;
+
+   orig[0] = x;
+   orig[1] = y;
+
+   // make sure y never passes through a vertex of the shape
+   y_frac = (float) STBTT_fmod(y, 1.0f);
+   if (y_frac < 0.01f)
+      y += 0.01f;
+   else if (y_frac > 0.99f)
+      y -= 0.01f;
+   orig[1] = y;
+
+   // test a ray from (-infinity,y) to (x,y)
+   for (i=0; i < nverts; ++i) {
+      if (verts[i].type == STBTT_vline) {
+         int x0 = (int) verts[i-1].x, y0 = (int) verts[i-1].y;
+         int x1 = (int) verts[i  ].x, y1 = (int) verts[i  ].y;
+         if (y > STBTT_min(y0,y1) && y < STBTT_max(y0,y1) && x > STBTT_min(x0,x1)) {
+            float x_inter = (y - y0) / (y1 - y0) * (x1-x0) + x0;
+            if (x_inter < x)
+               winding += (y0 < y1) ? 1 : -1;
+         }
+      }
+      if (verts[i].type == STBTT_vcurve) {
+         int x0 = (int) verts[i-1].x , y0 = (int) verts[i-1].y ;
+         int x1 = (int) verts[i  ].cx, y1 = (int) verts[i  ].cy;
+         int x2 = (int) verts[i  ].x , y2 = (int) verts[i  ].y ;
+         int ax = STBTT_min(x0,STBTT_min(x1,x2)), ay = STBTT_min(y0,STBTT_min(y1,y2));
+         int by = STBTT_max(y0,STBTT_max(y1,y2));
+         if (y > ay && y < by && x > ax) {
+            float q0[2],q1[2],q2[2];
+            float hits[2][2];
+            q0[0] = (float)x0;
+            q0[1] = (float)y0;
+            q1[0] = (float)x1;
+            q1[1] = (float)y1;
+            q2[0] = (float)x2;
+            q2[1] = (float)y2;
+            if (equal(q0,q1) || equal(q1,q2)) {
+               x0 = (int)verts[i-1].x;
+               y0 = (int)verts[i-1].y;
+               x1 = (int)verts[i  ].x;
+               y1 = (int)verts[i  ].y;
+               if (y > STBTT_min(y0,y1) && y < STBTT_max(y0,y1) && x > STBTT_min(x0,x1)) {
+                  float x_inter = (y - y0) / (y1 - y0) * (x1-x0) + x0;
+                  if (x_inter < x)
+                     winding += (y0 < y1) ? 1 : -1;
+               }
+            } else {
+               int num_hits = stbtt__ray_intersect_bezier(orig, ray, q0, q1, q2, hits);
+               if (num_hits >= 1)
+                  if (hits[0][0] < 0)
+                     winding += (hits[0][1] < 0 ? -1 : 1);
+               if (num_hits >= 2)
+                  if (hits[1][0] < 0)
+                     winding += (hits[1][1] < 0 ? -1 : 1);
+            }
+         }
+      }
+   }
+   return winding;
+}
+
+static float stbtt__cuberoot( float x )
+{
+   if (x<0)
+      return -(float) STBTT_pow(-x,1.0f/3.0f);
+   else
+      return  (float) STBTT_pow( x,1.0f/3.0f);
+}
+
+// x^3 + c*x^2 + b*x + a = 0
+static int stbtt__solve_cubic(float a, float b, float c, float* r)
+{
+	float s = -a / 3;
+	float p = b - a*a / 3;
+	float q = a * (2*a*a - 9*b) / 27 + c;
+   float p3 = p*p*p;
+	float d = q*q + 4*p3 / 27;
+	if (d >= 0) {
+		float z = (float) STBTT_sqrt(d);
+		float u = (-q + z) / 2;
+		float v = (-q - z) / 2;
+		u = stbtt__cuberoot(u);
+		v = stbtt__cuberoot(v);
+		r[0] = s + u + v;
+		return 1;
+	} else {
+	   float u = (float) STBTT_sqrt(-p/3);
+	   float v = (float) STBTT_acos(-STBTT_sqrt(-27/p3) * q / 2) / 3; // p3 must be negative, since d is negative
+	   float m = (float) STBTT_cos(v);
+      float n = (float) STBTT_cos(v-3.141592/2)*1.732050808f;
+	   r[0] = s + u * 2 * m;
+	   r[1] = s - u * (m + n);
+	   r[2] = s - u * (m - n);
+
+      //STBTT_assert( STBTT_fabs(((r[0]+a)*r[0]+b)*r[0]+c) < 0.05f);  // these asserts may not be safe at all scales, though they're in bezier t parameter units so maybe?
+      //STBTT_assert( STBTT_fabs(((r[1]+a)*r[1]+b)*r[1]+c) < 0.05f);
+      //STBTT_assert( STBTT_fabs(((r[2]+a)*r[2]+b)*r[2]+c) < 0.05f);
+   	return 3;
+   }
+}
+
+STBTT_DEF unsigned char * stbtt_GetGlyphSDF(const stbtt_fontinfo *info, float scale, int glyph, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff)
+{
+   float scale_x = scale, scale_y = scale;
+   int ix0,iy0,ix1,iy1;
+   int w,h;
+   unsigned char *data;
+
+   if (scale == 0) return NULL;
+
+   stbtt_GetGlyphBitmapBoxSubpixel(info, glyph, scale, scale, 0.0f,0.0f, &ix0,&iy0,&ix1,&iy1);
+
+   // if empty, return NULL
+   if (ix0 == ix1 || iy0 == iy1)
+      return NULL;
+
+   ix0 -= padding;
+   iy0 -= padding;
+   ix1 += padding;
+   iy1 += padding;
+
+   w = (ix1 - ix0);
+   h = (iy1 - iy0);
+
+   if (width ) *width  = w;
+   if (height) *height = h;
+   if (xoff  ) *xoff   = ix0;
+   if (yoff  ) *yoff   = iy0;
+
+   // invert for y-downwards bitmaps
+   scale_y = -scale_y;
+
+   {
+      int x,y,i,j;
+      float *precompute;
+      stbtt_vertex *verts;
+      int num_verts = stbtt_GetGlyphShape(info, glyph, &verts);
+      data = (unsigned char *) STBTT_malloc(w * h, info->userdata);
+      precompute = (float *) STBTT_malloc(num_verts * sizeof(float), info->userdata);
+
+      for (i=0,j=num_verts-1; i < num_verts; j=i++) {
+         if (verts[i].type == STBTT_vline) {
+            float x0 = verts[i].x*scale_x, y0 = verts[i].y*scale_y;
+            float x1 = verts[j].x*scale_x, y1 = verts[j].y*scale_y;
+            float dist = (float) STBTT_sqrt((x1-x0)*(x1-x0) + (y1-y0)*(y1-y0));
+            precompute[i] = (dist == 0) ? 0.0f : 1.0f / dist;
+         } else if (verts[i].type == STBTT_vcurve) {
+            float x2 = verts[j].x *scale_x, y2 = verts[j].y *scale_y;
+            float x1 = verts[i].cx*scale_x, y1 = verts[i].cy*scale_y;
+            float x0 = verts[i].x *scale_x, y0 = verts[i].y *scale_y;
+            float bx = x0 - 2*x1 + x2, by = y0 - 2*y1 + y2;
+            float len2 = bx*bx + by*by;
+            if (len2 != 0.0f)
+               precompute[i] = 1.0f / (bx*bx + by*by);
+            else
+               precompute[i] = 0.0f;
+         } else
+            precompute[i] = 0.0f;
+      }
+
+      for (y=iy0; y < iy1; ++y) {
+         for (x=ix0; x < ix1; ++x) {
+            float val;
+            float min_dist = 999999.0f;
+            float sx = (float) x + 0.5f;
+            float sy = (float) y + 0.5f;
+            float x_gspace = (sx / scale_x);
+            float y_gspace = (sy / scale_y);
+
+            int winding = stbtt__compute_crossings_x(x_gspace, y_gspace, num_verts, verts); // @OPTIMIZE: this could just be a rasterization, but needs to be line vs. non-tesselated curves so a new path
+
+            for (i=0; i < num_verts; ++i) {
+               float x0 = verts[i].x*scale_x, y0 = verts[i].y*scale_y;
+
+               // check against every point here rather than inside line/curve primitives -- @TODO: wrong if multiple 'moves' in a row produce a garbage point, and given culling, probably more efficient to do within line/curve
+               float dist2 = (x0-sx)*(x0-sx) + (y0-sy)*(y0-sy);
+               if (dist2 < min_dist*min_dist)
+                  min_dist = (float) STBTT_sqrt(dist2);
+
+               if (verts[i].type == STBTT_vline) {
+                  float x1 = verts[i-1].x*scale_x, y1 = verts[i-1].y*scale_y;
+
+                  // coarse culling against bbox
+                  //if (sx > STBTT_min(x0,x1)-min_dist && sx < STBTT_max(x0,x1)+min_dist &&
+                  //    sy > STBTT_min(y0,y1)-min_dist && sy < STBTT_max(y0,y1)+min_dist)
+                  float dist = (float) STBTT_fabs((x1-x0)*(y0-sy) - (y1-y0)*(x0-sx)) * precompute[i];
+                  STBTT_assert(i != 0);
+                  if (dist < min_dist) {
+                     // check position along line
+                     // x' = x0 + t*(x1-x0), y' = y0 + t*(y1-y0)
+                     // minimize (x'-sx)*(x'-sx)+(y'-sy)*(y'-sy)
+                     float dx = x1-x0, dy = y1-y0;
+                     float px = x0-sx, py = y0-sy;
+                     // minimize (px+t*dx)^2 + (py+t*dy)^2 = px*px + 2*px*dx*t + t^2*dx*dx + py*py + 2*py*dy*t + t^2*dy*dy
+                     // derivative: 2*px*dx + 2*py*dy + (2*dx*dx+2*dy*dy)*t, set to 0 and solve
+                     float t = -(px*dx + py*dy) / (dx*dx + dy*dy);
+                     if (t >= 0.0f && t <= 1.0f)
+                        min_dist = dist;
+                  }
+               } else if (verts[i].type == STBTT_vcurve) {
+                  float x2 = verts[i-1].x *scale_x, y2 = verts[i-1].y *scale_y;
+                  float x1 = verts[i  ].cx*scale_x, y1 = verts[i  ].cy*scale_y;
+                  float box_x0 = STBTT_min(STBTT_min(x0,x1),x2);
+                  float box_y0 = STBTT_min(STBTT_min(y0,y1),y2);
+                  float box_x1 = STBTT_max(STBTT_max(x0,x1),x2);
+                  float box_y1 = STBTT_max(STBTT_max(y0,y1),y2);
+                  // coarse culling against bbox to avoid computing cubic unnecessarily
+                  if (sx > box_x0-min_dist && sx < box_x1+min_dist && sy > box_y0-min_dist && sy < box_y1+min_dist) {
+                     int num=0;
+                     float ax = x1-x0, ay = y1-y0;
+                     float bx = x0 - 2*x1 + x2, by = y0 - 2*y1 + y2;
+                     float mx = x0 - sx, my = y0 - sy;
+                     float res[3],px,py,t,it;
+                     float a_inv = precompute[i];
+                     if (a_inv == 0.0) { // if a_inv is 0, it's 2nd degree so use quadratic formula
+                        float a = 3*(ax*bx + ay*by);
+                        float b = 2*(ax*ax + ay*ay) + (mx*bx+my*by);
+                        float c = mx*ax+my*ay;
+                        if (a == 0.0) { // if a is 0, it's linear
+                           if (b != 0.0) {
+                              res[num++] = -c/b;
+                           }
+                        } else {
+                           float discriminant = b*b - 4*a*c;
+                           if (discriminant < 0)
+                              num = 0;
+                           else {
+                              float root = (float) STBTT_sqrt(discriminant);
+                              res[0] = (-b - root)/(2*a);
+                              res[1] = (-b + root)/(2*a);
+                              num = 2; // don't bother distinguishing 1-solution case, as code below will still work
+                           }
+                        }
+                     } else {
+                        float b = 3*(ax*bx + ay*by) * a_inv; // could precompute this as it doesn't depend on sample point
+                        float c = (2*(ax*ax + ay*ay) + (mx*bx+my*by)) * a_inv;
+                        float d = (mx*ax+my*ay) * a_inv;
+                        num = stbtt__solve_cubic(b, c, d, res);
+                     }
+                     if (num >= 1 && res[0] >= 0.0f && res[0] <= 1.0f) {
+                        t = res[0], it = 1.0f - t;
+                        px = it*it*x0 + 2*t*it*x1 + t*t*x2;
+                        py = it*it*y0 + 2*t*it*y1 + t*t*y2;
+                        dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy);
+                        if (dist2 < min_dist * min_dist)
+                           min_dist = (float) STBTT_sqrt(dist2);
+                     }
+                     if (num >= 2 && res[1] >= 0.0f && res[1] <= 1.0f) {
+                        t = res[1], it = 1.0f - t;
+                        px = it*it*x0 + 2*t*it*x1 + t*t*x2;
+                        py = it*it*y0 + 2*t*it*y1 + t*t*y2;
+                        dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy);
+                        if (dist2 < min_dist * min_dist)
+                           min_dist = (float) STBTT_sqrt(dist2);
+                     }
+                     if (num >= 3 && res[2] >= 0.0f && res[2] <= 1.0f) {
+                        t = res[2], it = 1.0f - t;
+                        px = it*it*x0 + 2*t*it*x1 + t*t*x2;
+                        py = it*it*y0 + 2*t*it*y1 + t*t*y2;
+                        dist2 = (px-sx)*(px-sx) + (py-sy)*(py-sy);
+                        if (dist2 < min_dist * min_dist)
+                           min_dist = (float) STBTT_sqrt(dist2);
+                     }
+                  }
+               }
+            }
+            if (winding == 0)
+               min_dist = -min_dist;  // if outside the shape, value is negative
+            val = onedge_value + pixel_dist_scale * min_dist;
+            if (val < 0)
+               val = 0;
+            else if (val > 255)
+               val = 255;
+            data[(y-iy0)*w+(x-ix0)] = (unsigned char) val;
+         }
+      }
+      STBTT_free(precompute, info->userdata);
+      STBTT_free(verts, info->userdata);
+   }
+   return data;
+}
+
+STBTT_DEF unsigned char * stbtt_GetCodepointSDF(const stbtt_fontinfo *info, float scale, int codepoint, int padding, unsigned char onedge_value, float pixel_dist_scale, int *width, int *height, int *xoff, int *yoff)
+{
+   return stbtt_GetGlyphSDF(info, scale, stbtt_FindGlyphIndex(info, codepoint), padding, onedge_value, pixel_dist_scale, width, height, xoff, yoff);
+}
+
+STBTT_DEF void stbtt_FreeSDF(unsigned char *bitmap, void *userdata)
+{
+   STBTT_free(bitmap, userdata);
+}
+
+//////////////////////////////////////////////////////////////////////////////
+//
+// font name matching -- recommended not to use this
+//
+
+// check if a utf8 string contains a prefix which is the utf16 string; if so return length of matching utf8 string
+static stbtt_int32 stbtt__CompareUTF8toUTF16_bigendian_prefix(stbtt_uint8 *s1, stbtt_int32 len1, stbtt_uint8 *s2, stbtt_int32 len2)
+{
+   stbtt_int32 i=0;
+
+   // convert utf16 to utf8 and compare the results while converting
+   while (len2) {
+      stbtt_uint16 ch = s2[0]*256 + s2[1];
+      if (ch < 0x80) {
+         if (i >= len1) return -1;
+         if (s1[i++] != ch) return -1;
+      } else if (ch < 0x800) {
+         if (i+1 >= len1) return -1;
+         if (s1[i++] != 0xc0 + (ch >> 6)) return -1;
+         if (s1[i++] != 0x80 + (ch & 0x3f)) return -1;
+      } else if (ch >= 0xd800 && ch < 0xdc00) {
+         stbtt_uint32 c;
+         stbtt_uint16 ch2 = s2[2]*256 + s2[3];
+         if (i+3 >= len1) return -1;
+         c = ((ch - 0xd800) << 10) + (ch2 - 0xdc00) + 0x10000;
+         if (s1[i++] != 0xf0 + (c >> 18)) return -1;
+         if (s1[i++] != 0x80 + ((c >> 12) & 0x3f)) return -1;
+         if (s1[i++] != 0x80 + ((c >>  6) & 0x3f)) return -1;
+         if (s1[i++] != 0x80 + ((c      ) & 0x3f)) return -1;
+         s2 += 2; // plus another 2 below
+         len2 -= 2;
+      } else if (ch >= 0xdc00 && ch < 0xe000) {
+         return -1;
+      } else {
+         if (i+2 >= len1) return -1;
+         if (s1[i++] != 0xe0 + (ch >> 12)) return -1;
+         if (s1[i++] != 0x80 + ((ch >> 6) & 0x3f)) return -1;
+         if (s1[i++] != 0x80 + ((ch     ) & 0x3f)) return -1;
+      }
+      s2 += 2;
+      len2 -= 2;
+   }
+   return i;
+}
+
+static int stbtt_CompareUTF8toUTF16_bigendian_internal(char *s1, int len1, char *s2, int len2)
+{
+   return len1 == stbtt__CompareUTF8toUTF16_bigendian_prefix((stbtt_uint8*) s1, len1, (stbtt_uint8*) s2, len2);
+}
+
+// returns results in whatever encoding you request... but note that 2-byte encodings
+// will be BIG-ENDIAN... use stbtt_CompareUTF8toUTF16_bigendian() to compare
+STBTT_DEF const char *stbtt_GetFontNameString(const stbtt_fontinfo *font, int *length, int platformID, int encodingID, int languageID, int nameID)
+{
+   stbtt_int32 i,count,stringOffset;
+   stbtt_uint8 *fc = font->data;
+   stbtt_uint32 offset = font->fontstart;
+   stbtt_uint32 nm = stbtt__find_table(fc, offset, "name");
+   if (!nm) return NULL;
+
+   count = ttUSHORT(fc+nm+2);
+   stringOffset = nm + ttUSHORT(fc+nm+4);
+   for (i=0; i < count; ++i) {
+      stbtt_uint32 loc = nm + 6 + 12 * i;
+      if (platformID == ttUSHORT(fc+loc+0) && encodingID == ttUSHORT(fc+loc+2)
+          && languageID == ttUSHORT(fc+loc+4) && nameID == ttUSHORT(fc+loc+6)) {
+         *length = ttUSHORT(fc+loc+8);
+         return (const char *) (fc+stringOffset+ttUSHORT(fc+loc+10));
+      }
+   }
+   return NULL;
+}
+
+static int stbtt__matchpair(stbtt_uint8 *fc, stbtt_uint32 nm, stbtt_uint8 *name, stbtt_int32 nlen, stbtt_int32 target_id, stbtt_int32 next_id)
+{
+   stbtt_int32 i;
+   stbtt_int32 count = ttUSHORT(fc+nm+2);
+   stbtt_int32 stringOffset = nm + ttUSHORT(fc+nm+4);
+
+   for (i=0; i < count; ++i) {
+      stbtt_uint32 loc = nm + 6 + 12 * i;
+      stbtt_int32 id = ttUSHORT(fc+loc+6);
+      if (id == target_id) {
+         // find the encoding
+         stbtt_int32 platform = ttUSHORT(fc+loc+0), encoding = ttUSHORT(fc+loc+2), language = ttUSHORT(fc+loc+4);
+
+         // is this a Unicode encoding?
+         if (platform == 0 || (platform == 3 && encoding == 1) || (platform == 3 && encoding == 10)) {
+            stbtt_int32 slen = ttUSHORT(fc+loc+8);
+            stbtt_int32 off = ttUSHORT(fc+loc+10);
+
+            // check if there's a prefix match
+            stbtt_int32 matchlen = stbtt__CompareUTF8toUTF16_bigendian_prefix(name, nlen, fc+stringOffset+off,slen);
+            if (matchlen >= 0) {
+               // check for target_id+1 immediately following, with same encoding & language
+               if (i+1 < count && ttUSHORT(fc+loc+12+6) == next_id && ttUSHORT(fc+loc+12) == platform && ttUSHORT(fc+loc+12+2) == encoding && ttUSHORT(fc+loc+12+4) == language) {
+                  slen = ttUSHORT(fc+loc+12+8);
+                  off = ttUSHORT(fc+loc+12+10);
+                  if (slen == 0) {
+                     if (matchlen == nlen)
+                        return 1;
+                  } else if (matchlen < nlen && name[matchlen] == ' ') {
+                     ++matchlen;
+                     if (stbtt_CompareUTF8toUTF16_bigendian_internal((char*) (name+matchlen), nlen-matchlen, (char*)(fc+stringOffset+off),slen))
+                        return 1;
+                  }
+               } else {
+                  // if nothing immediately following
+                  if (matchlen == nlen)
+                     return 1;
+               }
+            }
+         }
+
+         // @TODO handle other encodings
+      }
+   }
+   return 0;
+}
+
+static int stbtt__matches(stbtt_uint8 *fc, stbtt_uint32 offset, stbtt_uint8 *name, stbtt_int32 flags)
+{
+   stbtt_int32 nlen = (stbtt_int32) STBTT_strlen((char *) name);
+   stbtt_uint32 nm,hd;
+   if (!stbtt__isfont(fc+offset)) return 0;
+
+   // check italics/bold/underline flags in macStyle...
+   if (flags) {
+      hd = stbtt__find_table(fc, offset, "head");
+      if ((ttUSHORT(fc+hd+44) & 7) != (flags & 7)) return 0;
+   }
+
+   nm = stbtt__find_table(fc, offset, "name");
+   if (!nm) return 0;
+
+   if (flags) {
+      // if we checked the macStyle flags, then just check the family and ignore the subfamily
+      if (stbtt__matchpair(fc, nm, name, nlen, 16, -1))  return 1;
+      if (stbtt__matchpair(fc, nm, name, nlen,  1, -1))  return 1;
+      if (stbtt__matchpair(fc, nm, name, nlen,  3, -1))  return 1;
+   } else {
+      if (stbtt__matchpair(fc, nm, name, nlen, 16, 17))  return 1;
+      if (stbtt__matchpair(fc, nm, name, nlen,  1,  2))  return 1;
+      if (stbtt__matchpair(fc, nm, name, nlen,  3, -1))  return 1;
+   }
+
+   return 0;
+}
+
+static int stbtt_FindMatchingFont_internal(unsigned char *font_collection, char *name_utf8, stbtt_int32 flags)
+{
+   stbtt_int32 i;
+   for (i=0;;++i) {
+      stbtt_int32 off = stbtt_GetFontOffsetForIndex(font_collection, i);
+      if (off < 0) return off;
+      if (stbtt__matches((stbtt_uint8 *) font_collection, off, (stbtt_uint8*) name_utf8, flags))
+         return off;
+   }
+}
+
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wcast-qual"
+#endif
+
+STBTT_DEF int stbtt_BakeFontBitmap(const unsigned char *data, int offset,
+                                float pixel_height, unsigned char *pixels, int pw, int ph,
+                                int first_char, int num_chars, stbtt_bakedchar *chardata)
+{
+   return stbtt_BakeFontBitmap_internal((unsigned char *) data, offset, pixel_height, pixels, pw, ph, first_char, num_chars, chardata);
+}
+
+STBTT_DEF int stbtt_GetFontOffsetForIndex(const unsigned char *data, int index)
+{
+   return stbtt_GetFontOffsetForIndex_internal((unsigned char *) data, index);
+}
+
+STBTT_DEF int stbtt_GetNumberOfFonts(const unsigned char *data)
+{
+   return stbtt_GetNumberOfFonts_internal((unsigned char *) data);
+}
+
+STBTT_DEF int stbtt_InitFont(stbtt_fontinfo *info, const unsigned char *data, int offset)
+{
+   return stbtt_InitFont_internal(info, (unsigned char *) data, offset);
+}
+
+STBTT_DEF int stbtt_FindMatchingFont(const unsigned char *fontdata, const char *name, int flags)
+{
+   return stbtt_FindMatchingFont_internal((unsigned char *) fontdata, (char *) name, flags);
+}
+
+STBTT_DEF int stbtt_CompareUTF8toUTF16_bigendian(const char *s1, int len1, const char *s2, int len2)
+{
+   return stbtt_CompareUTF8toUTF16_bigendian_internal((char *) s1, len1, (char *) s2, len2);
+}
+
+#if defined(__GNUC__) || defined(__clang__)
+#pragma GCC diagnostic pop
+#endif
+
+#endif // STB_TRUETYPE_IMPLEMENTATION
+
+
+// FULL VERSION HISTORY
+//
+//   1.19 (2018-02-11) OpenType GPOS kerning (horizontal only), STBTT_fmod
+//   1.18 (2018-01-29) add missing function
+//   1.17 (2017-07-23) make more arguments const; doc fix
+//   1.16 (2017-07-12) SDF support
+//   1.15 (2017-03-03) make more arguments const
+//   1.14 (2017-01-16) num-fonts-in-TTC function
+//   1.13 (2017-01-02) support OpenType fonts, certain Apple fonts
+//   1.12 (2016-10-25) suppress warnings about casting away const with -Wcast-qual
+//   1.11 (2016-04-02) fix unused-variable warning
+//   1.10 (2016-04-02) allow user-defined fabs() replacement
+//                     fix memory leak if fontsize=0.0
+//                     fix warning from duplicate typedef
+//   1.09 (2016-01-16) warning fix; avoid crash on outofmem; use alloc userdata for PackFontRanges
+//   1.08 (2015-09-13) document stbtt_Rasterize(); fixes for vertical & horizontal edges
+//   1.07 (2015-08-01) allow PackFontRanges to accept arrays of sparse codepoints;
+//                     allow PackFontRanges to pack and render in separate phases;
+//                     fix stbtt_GetFontOFfsetForIndex (never worked for non-0 input?);
+//                     fixed an assert() bug in the new rasterizer
+//                     replace assert() with STBTT_assert() in new rasterizer
+//   1.06 (2015-07-14) performance improvements (~35% faster on x86 and x64 on test machine)
+//                     also more precise AA rasterizer, except if shapes overlap
+//                     remove need for STBTT_sort
+//   1.05 (2015-04-15) fix misplaced definitions for STBTT_STATIC
+//   1.04 (2015-04-15) typo in example
+//   1.03 (2015-04-12) STBTT_STATIC, fix memory leak in new packing, various fixes
+//   1.02 (2014-12-10) fix various warnings & compile issues w/ stb_rect_pack, C++
+//   1.01 (2014-12-08) fix subpixel position when oversampling to exactly match
+//                        non-oversampled; STBTT_POINT_SIZE for packed case only
+//   1.00 (2014-12-06) add new PackBegin etc. API, w/ support for oversampling
+//   0.99 (2014-09-18) fix multiple bugs with subpixel rendering (ryg)
+//   0.9  (2014-08-07) support certain mac/iOS fonts without an MS platformID
+//   0.8b (2014-07-07) fix a warning
+//   0.8  (2014-05-25) fix a few more warnings
+//   0.7  (2013-09-25) bugfix: subpixel glyph bug fixed in 0.5 had come back
+//   0.6c (2012-07-24) improve documentation
+//   0.6b (2012-07-20) fix a few more warnings
+//   0.6  (2012-07-17) fix warnings; added stbtt_ScaleForMappingEmToPixels,
+//                        stbtt_GetFontBoundingBox, stbtt_IsGlyphEmpty
+//   0.5  (2011-12-09) bugfixes:
+//                        subpixel glyph renderer computed wrong bounding box
+//                        first vertex of shape can be off-curve (FreeSans)
+//   0.4b (2011-12-03) fixed an error in the font baking example
+//   0.4  (2011-12-01) kerning, subpixel rendering (tor)
+//                    bugfixes for:
+//                        codepoint-to-glyph conversion using table fmt=12
+//                        codepoint-to-glyph conversion using table fmt=4
+//                        stbtt_GetBakedQuad with non-square texture (Zer)
+//                    updated Hello World! sample to use kerning and subpixel
+//                    fixed some warnings
+//   0.3  (2009-06-24) cmap fmt=12, compound shapes (MM)
+//                    userdata, malloc-from-userdata, non-zero fill (stb)
+//   0.2  (2009-03-11) Fix unsigned/signed char warnings
+//   0.1  (2009-03-09) First public release
+//
+
+/*
+------------------------------------------------------------------------------
+This software is available under 2 licenses -- choose whichever you prefer.
+------------------------------------------------------------------------------
+ALTERNATIVE A - MIT License
+Copyright (c) 2017 Sean Barrett
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+of the Software, and to permit persons to whom the Software is furnished to do
+so, subject to the following conditions:
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+------------------------------------------------------------------------------
+ALTERNATIVE B - Public Domain (www.unlicense.org)
+This is free and unencumbered software released into the public domain.
+Anyone is free to copy, modify, publish, use, compile, sell, or distribute this
+software, either in source code form or as a compiled binary, for any purpose,
+commercial or non-commercial, and by any means.
+In jurisdictions that recognize copyright laws, the author or authors of this
+software dedicate any and all copyright interest in the software to the public
+domain. We make this dedication for the benefit of the public at large and to
+the detriment of our heirs and successors. We intend this dedication to be an
+overt act of relinquishment in perpetuity of all present and future rights to
+this software under copyright law.
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+------------------------------------------------------------------------------
+*/

resources/la_modelling.c

@@ -92,7 +92,7 @@ MSelectData* la_InitSelectData(int w, int h, tnsCamera* camera){
     MSelectData* sd=memAcquireSimple(sizeof(MSelectData));
     if (!sd->FBO || sd->FBO->pColor[0]->Height != h || sd->FBO->pColor[0]->Width != w){
         if (sd->FBO) tnsDelete2DOffscreen(sd->FBO);
-        sd->FBO = tnsCreate2DOffscreen(GL_RGB, w, h, 0, 1); sd->Color=sd->FBO->pColor[0];
+        sd->FBO = tnsCreate2DOffscreen(GL_RGB, w, h, 0, 1, 0); sd->Color=sd->FBO->pColor[0];
     }
     tnsDrawToOffscreen(sd->FBO, 1, 0);
     return sd;

resources/la_widgets_viewers.c

@@ -72,12 +72,12 @@ void la_RootObjectDraw(laBoxedTheme *bt, tnsObject *root, laUiItem* ui){
     if (!e->OffScr || e->OffScr->pColor[0]->Height != ui->B - ui->U || e->OffScr->pColor[0]->Width != ui->R - ui->L){
         if (e->OffScr) tnsDelete2DOffscreen(e->OffScr);
         if (e->DeferredOffScr) tnsDelete2DOffscreen(e->DeferredOffScr);
-        e->OffScr = tnsCreate2DOffscreen(GL_RGBA, W, H, MAIN.PanelMultisample ,1);
+        e->OffScr = tnsCreate2DOffscreen(GL_RGBA, W, H, MAIN.PanelMultisample ,1, 0);
         e->DeferredOffScr = tnsCreateDeferredOffscreen(W,H);
     }
 
     if (0){//(e->CurrentScene && e->CurrentScene->ActiveSun){
-        //if(!e->OffScrShadow) e->OffScrShadow = tnsCreate2DOffscreen(0, LA_DEPTH_RESOLUTION, LA_DEPTH_RESOLUTION, MAIN.PanelMultisample, 1);
+        //if(!e->OffScrShadow) e->OffScrShadow = tnsCreate2DOffscreen(0, LA_DEPTH_RESOLUTION, LA_DEPTH_RESOLUTION, MAIN.PanelMultisample, 1, 0);
 
         //tnsUseNoTexture();
         //tnsDrawToOffscreen(e->OffScrShadow, 1, TNS_ATTACHMENT_ARRAY_NONE);
@@ -263,7 +263,7 @@ void la_CanvasDrawTexture(laBoxedTheme *bt, tnsTexture *t, laUiItem* ui){
 
     if (!e->OffScr || e->OffScr->pColor[0]->Height != ui->B - ui->U || e->OffScr->pColor[0]->Width != ui->R - ui->L){
         if (e->OffScr) tnsDelete2DOffscreen(e->OffScr);
-        e->OffScr = tnsCreate2DOffscreen(GL_RGBA, W, H, MAIN.PanelMultisample, 1);
+        e->OffScr = tnsCreate2DOffscreen(GL_RGBA, W, H, MAIN.PanelMultisample, 1, 0);
     }
 
     tnsDrawToOffscreen(e->OffScr, 1, 0);