UI size from DPI

la_kernel.c

@@ -32,6 +32,7 @@
 #include <X11/extensions/XInput.h>
 #include <X11/extensions/XInput2.h>
 #include <X11/extensions/Xfixes.h>
+#include <X11/extensions/Xrandr.h>
 #include <X11/Xcursor/Xcursor.h>
 #include <X11/cursorfont.h>
 #include <GL/glx.h>
@@ -605,6 +606,42 @@ void logClear(){
     while(l=lstPopItem(&MAIN.Logs)){ strSafeDestroy(&l->Content); memFree(l); }
 }
 
+#ifdef __linux__
+int la_GetDPI(){
+    XRRScreenResources *screen;
+    XRROutputInfo *info;
+    XRRCrtcInfo *crtc_info;
+    XRRCrtcInfo *crtc;
+    int iscres, icrtc, dpi=0;
+
+    screen=XRRGetScreenResources(MAIN.dpy, DefaultRootWindow(MAIN.dpy));
+    for(iscres=0;iscres<screen->noutput;iscres++){
+        info=XRRGetOutputInfo(MAIN.dpy,screen,screen->outputs[iscres]);
+        if(!info->mm_width || !info->mm_height){ continue; }
+        logPrint("    Xrandr reported output size: %dmm x %dmm\n",info->mm_width,info->mm_height);
+        crtc=XRRGetCrtcInfo(MAIN.dpy,screen,info->crtc);
+        dpi=(real)crtc->width/(real)info->mm_width*25.4;
+        logPrint("    CRTC: %d x %d, around %ddpi\n",crtc->width,crtc->height,dpi);
+        XRRFreeCrtcInfo(crtc);
+        //if(info->connection==RR_Connected){
+        //    for (icrtc=0;icrtc<info->ncrtc;icrtc++) {
+        //        crtc_info=XRRGetCrtcInfo(MAIN.dpy,screen,screen->crtcs[icrtc]);
+        //        printf("==> %d,%d + %dx%d\n", crtc_info->x, crtc_info->y, crtc_info->width, crtc_info->height);
+        //        XRRFreeCrtcInfo(crtc_info);
+        //    }
+        //}
+        XRRFreeOutputInfo(info);
+    }
+    XRRFreeScreenResources(screen);
+    return dpi;
+}
+#endif
+#ifdef _WIN32
+int la_GetDPI(){
+    return 144;
+}
+#endif
+
 
 #define PROGRESSW (LA_RH*15)
 
@@ -940,7 +977,11 @@ int laGetReadyWith(laInitArguments* ia){
     MAIN.SavePreferenceOnExit=1;
     
     MAIN.FontSize = 0.6;
-    MAIN.UiRowHeight = MAIN.ScaledUiRowHeight =24;
+
+    int dpi=la_GetDPI(); if((!dpi) || dpi<96){ dpi=144; } if(dpi>300){ dpi=300; }
+    int UiSize=(int)(tnsLinearItp(16.0f,24.0f,tnsGetRatiod(96,144,dpi))+0.5);
+    
+    MAIN.UiRowHeight = MAIN.ScaledUiRowHeight =UiSize;
     MAIN.UiScale=1;
     MAIN.MarginSize = 1;
 

lagui-config.cmake

@@ -26,6 +26,7 @@ if (CMAKE_SYSTEM_NAME MATCHES "Linux")
         ${OPENGL_LIBRARY}
         ${FREETYPE_LIBRARIES}
         ${X11_Xfixes_LIB}
+        ${X11_Xrandr_LIB}
         ${PNG_LIBRARY}
         m X11 Xi Xcursor
         ${CMAKE_DL_LIBS}