subpixel antialiasing in freetype fonts

dlanguilib.visualdproj

@@ -66,7 +66,7 @@
   <debuglevel>0</debuglevel>
   <debugids>DebugFocus</debugids>
   <versionlevel>0</versionlevel>
-  <versionids>EmbedStandardResources Unicode</versionids>
+  <versionids>EmbedStandardResources Unicode USE_FREETYPE</versionids>
   <dump_source>0</dump_source>
   <mapverbosity>0</mapverbosity>
   <createImplib>1</createImplib>
@@ -89,6 +89,7 @@
   <resfile />
   <exefile>$(OutDir)\$(ProjectName).lib</exefile>
   <useStdLibPath>1</useStdLibPath>
+  <cRuntime>2</cRuntime>
   <additionalOptions />
   <preBuildCommand />
   <postBuildCommand />
@@ -183,6 +184,7 @@
   <resfile />
   <exefile>$(OutDir)\$(ProjectName).lib</exefile>
   <useStdLibPath>1</useStdLibPath>
+  <cRuntime>1</cRuntime>
   <additionalOptions />
   <preBuildCommand />
   <postBuildCommand />

examples/example1/example1.visualdproj

@@ -66,7 +66,7 @@
   <debuglevel>0</debuglevel>
   <debugids />
   <versionlevel>0</versionlevel>
-  <versionids>Unicode</versionids>
+  <versionids>Unicode USE_FREETYPE</versionids>
   <dump_source>0</dump_source>
   <mapverbosity>3</mapverbosity>
   <createImplib>0</createImplib>
@@ -89,6 +89,7 @@
   <resfile />
   <exefile>$(OutDir)\$(ProjectName).exe</exefile>
   <useStdLibPath>1</useStdLibPath>
+  <cRuntime>2</cRuntime>
   <additionalOptions>-profile</additionalOptions>
   <preBuildCommand />
   <postBuildCommand />
@@ -183,6 +184,7 @@
   <resfile />
   <exefile>$(OutDir)\$(ProjectName).exe</exefile>
   <useStdLibPath>1</useStdLibPath>
+  <cRuntime>1</cRuntime>
   <additionalOptions />
   <preBuildCommand />
   <postBuildCommand />

examples/example1/src/example1.d

@@ -206,8 +206,13 @@ extern (C) int UIAppMain(string[] args) {
     // you can override antialiasing setting here (0 means antialiasing always on, some big value = always off)
     // fonts with size less than specified value will not be antialiased
     FontManager.minAnitialiasedFontSize = 0; // 0 means always antialiased
+	version (USE_OPENGL) {
 		// you can turn on subpixel font rendering (ClearType) here
-    FontManager.subpixelRenderingMode = SubpixelRenderingMode.None;// SubpixelRenderingMode.BGR;
+		FontManager.subpixelRenderingMode = SubpixelRenderingMode.None; //
+	} else {
+		// you can turn on subpixel font rendering (ClearType) here
+		FontManager.subpixelRenderingMode = SubpixelRenderingMode.BGR; //SubpixelRenderingMode.None; //
+	}
 
     // create window
     Window window = Platform.instance.createWindow("My Window", null);

src/dlangui/graphics/ftfonts.d

@@ -246,8 +246,9 @@ private class FreeTypeFontFile {
         //FONT_GUARD
         int glyph_index = getCharIndex(code, def_char);
         int flags = FT_LOAD_DEFAULT;
-        const bool _drawMonochrome = _size < FontManager.instance.minAnitialiasedFontSize;
+        const bool _drawMonochrome = _size < FontManager.minAnitialiasedFontSize;
-        flags |= (!_drawMonochrome ? FT_LOAD_TARGET_NORMAL : FT_LOAD_TARGET_MONO);
+		SubpixelRenderingMode subpixel = _drawMonochrome ? SubpixelRenderingMode.None : FontManager.subpixelRenderingMode;
+        flags |= (!_drawMonochrome ? (subpixel ? FT_LOAD_TARGET_LCD : FT_LOAD_TARGET_NORMAL) : FT_LOAD_TARGET_MONO);
         if (withImage)
             flags |= FT_LOAD_RENDER;
         if (FontManager.instance.hintingMode == HintingMode.AutoHint)
@@ -261,16 +262,16 @@ private class FreeTypeFontFile {
         if ( error )
             return false;
         glyph.lastUsage = 1;
-        glyph.blackBoxX = cast(ubyte)(_slot.metrics.width >> 6);
+        glyph.blackBoxX = cast(ushort)(_slot.metrics.width >> 6);
         glyph.blackBoxY = cast(ubyte)(_slot.metrics.height >> 6);
         glyph.originX =   cast(byte)(_slot.metrics.horiBearingX >> 6);
         glyph.originY =   cast(byte)(_slot.metrics.horiBearingY >> 6);
         glyph.width =     cast(ubyte)(myabs(cast(int)(_slot.metrics.horiAdvance)) >> 6);
-        glyph.subpixelMode = SubpixelRenderingMode.None;
+        glyph.subpixelMode = subpixel;
 		//glyph.glyphIndex = cast(ushort)code;
         if (withImage) {
             FT_Bitmap*  bitmap = &_slot.bitmap;
-            ubyte w = cast(ubyte)(bitmap.width);
+            ushort w = cast(ushort)(bitmap.width);
 			ubyte h = cast(ubyte)(bitmap.rows);
             glyph.blackBoxX = w;
             glyph.blackBoxY = h;
@@ -298,8 +299,11 @@ private class FreeTypeFontFile {
 
                 } else {
                     // antialiased
-                    for (int i = 0; i < sz; i++)
+					for (uint y = 0; y < h; y++) {
-                        glyph.glyph[i] = bitmap.buffer[i];
+						for (uint x = 0; x < w; x++) {
+							glyph.glyph[y * w + x] = bitmap.buffer[y * bitmap.pitch + x];
+						}
+					}
                 }
             }
             version (USE_OPENGL) {
@@ -491,6 +495,7 @@ class FreeTypeFontManager : FontManager {
             Log.e("Cannot init freetype library, error=", error);
             throw new Exception("Cannot init freetype library");
         }
+		FT_Library_SetLcdFilter(_library, FT_LCD_FILTER_DEFAULT);
     }
     ~this() {
 		debug Log.d("FreeTypeFontManager ~this()");