Merge pull request #229 from jpcima/update-nanovg

Update NanoVG

dgl/src/NanoVG.cpp

@@ -66,15 +66,23 @@ DGL_EXT(PFNGLVERTEXATTRIBPOINTERPROC,      glVertexAttribPointer)
 #if defined(NANOVG_GL2)
 # define nvgCreateGL nvgCreateGL2
 # define nvgDeleteGL nvgDeleteGL2
+# define nvglCreateImageFromHandle nvglCreateImageFromHandleGL2
+# define nvglImageHandle nvglImageHandleGL2
 #elif defined(NANOVG_GL3)
 # define nvgCreateGL nvgCreateGL3
 # define nvgDeleteGL nvgDeleteGL3
+# define nvglCreateImageFromHandle nvglCreateImageFromHandleGL3
+# define nvglImageHandle nvglImageHandleGL3
 #elif defined(NANOVG_GLES2)
 # define nvgCreateGL nvgCreateGLES2
 # define nvgDeleteGL nvgDeleteGLES2
+# define nvglCreateImageFromHandle nvglCreateImageFromHandleGLES2
+# define nvglImageHandle nvglImageHandleGLES2
 #elif defined(NANOVG_GLES3)
 # define nvgCreateGL nvgCreateGLES3
 # define nvgDeleteGL nvgDeleteGLES3
+# define nvglCreateImageFromHandle nvglCreateImageFromHandleGLES3
+# define nvglImageHandle nvglImageHandleGLES3
 #endif
 
 static NVGcontext* nvgCreateGL_helper(int flags)
@@ -922,7 +930,7 @@ void NanoVG::loadSharedResources()
 
     using namespace dpf_resources;
 
-    nvgCreateFontMem(fContext, NANOVG_DEJAVU_SANS_TTF, (const uchar*)dejavusans_ttf, dejavusans_ttf_size, 0);
+    nvgCreateFontMem(fContext, NANOVG_DEJAVU_SANS_TTF, (uchar*)dejavusans_ttf, dejavusans_ttf_size, 0);
 }
 #endif
 

dgl/src/nanovg/fontstash.h

@@ -38,10 +38,15 @@ enum FONSalign {
 	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.		
+	// 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,
@@ -78,6 +83,7 @@ struct FONStextIter {
 	const char* next;
 	const char* end;
 	unsigned int utf8state;
+	int bitmapOption;
 };
 typedef struct FONStextIter FONStextIter;
 
@@ -90,14 +96,14 @@ 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. 
+// 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 fonsAddFontMem(FONScontext* s, const char* name, const unsigned char* data, int ndata, int freeData);
+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
@@ -122,7 +128,7 @@ 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 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
@@ -154,20 +160,28 @@ typedef struct FONSttFontImpl FONSttFontImpl;
 static FT_Library ftLibrary;
 
 int fons__tt_init(FONScontext *context)
-{ 
+{
 	FT_Error ftError;
-        FONS_NOTUSED(context);
+	FONS_NOTUSED(context);
 	ftError = FT_Init_FreeType(&ftLibrary);
 	return ftError == 0;
 }
 
-int fons__tt_loadFont(FONScontext *context, FONSttFontImpl *font, const unsigned char *data, int dataSize)
+int fons__tt_done(FONScontext *context)
+{
+	FT_Error ftError;
+	FONS_NOTUSED(context);
+	ftError = FT_Done_FreeType(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);
 
 	//font->font.userdata = stash;
-	ftError = FT_New_Memory_Face(ftLibrary, (const FT_Byte*)data, dataSize, 0, &font->font);
+	ftError = FT_New_Memory_Face(ftLibrary, (const FT_Byte*)data, dataSize, fontIndex, &font->font);
 	return ftError == 0;
 }
 
@@ -180,7 +194,12 @@ void fons__tt_getFontVMetrics(FONSttFontImpl *font, int *ascent, int *descent, i
 
 float fons__tt_getPixelHeightScale(FONSttFontImpl *font, float size)
 {
+#if 1
+	// Note(DPF) maintain pixel-based units for compat after nanovg update
 	return size / (font->font->ascender - font->font->descender);
+#else
+	return size / font->font->units_per_EM;
+#endif
 }
 
 int fons__tt_getGlyphIndex(FONSttFontImpl *font, int codepoint)
@@ -193,16 +212,28 @@ int fons__tt_buildGlyphBitmap(FONSttFontImpl *font, int glyph, float size, float
 {
 	FT_Error ftError;
 	FT_GlyphSlot ftGlyph;
+	FT_Fixed advFixed;
 	FONS_NOTUSED(scale);
 
+#if 1
+	// Note(DPF) maintain pixel-based units for compat after nanovg update
 	ftError = FT_Set_Pixel_Sizes(font->font, 0, (FT_UInt)(size * (float)font->font->units_per_EM / (float)(font->font->ascender - font->font->descender)));
+#else
+	ftError = FT_Set_Pixel_Sizes(font->font, 0, size);
+#endif
 	if (ftError) return 0;
+#if 1
+	// Note(DPF) maintain pixel-based units for compat after nanovg update
 	ftError = FT_Load_Glyph(font->font, glyph, FT_LOAD_RENDER);
+#else
+	ftError = FT_Load_Glyph(font->font, glyph, FT_LOAD_RENDER | FT_LOAD_FORCE_AUTOHINT);
+#endif
 	if (ftError) return 0;
-	ftError = FT_Get_Advance(font->font, glyph, FT_LOAD_NO_SCALE, (FT_Fixed*)advance);
+	ftError = FT_Get_Advance(font->font, glyph, FT_LOAD_NO_SCALE, &advFixed);
 	if (ftError) return 0;
 	ftGlyph = font->font->glyph;
-	*lsb = ftGlyph->metrics.horiBearingX;
+	*advance = (int)advFixed;
+	*lsb = (int)ftGlyph->metrics.horiBearingX;
 	*x0 = ftGlyph->bitmap_left;
 	*x1 = *x0 + ftGlyph->bitmap.width;
 	*y0 = -ftGlyph->bitmap_top;
@@ -215,7 +246,7 @@ void fons__tt_renderGlyphBitmap(FONSttFontImpl *font, unsigned char *output, int
 {
 	FT_GlyphSlot ftGlyph = font->font->glyph;
 	int ftGlyphOffset = 0;
-	int x, y;
+	unsigned int x, y;
 	FONS_NOTUSED(outWidth);
 	FONS_NOTUSED(outHeight);
 	FONS_NOTUSED(scaleX);
@@ -233,7 +264,7 @@ 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 ftKerning.x;
+	return (int)((ftKerning.x + 32) >> 6);  // Round up and convert to integer
 }
 
 #else
@@ -256,13 +287,24 @@ int fons__tt_init(FONScontext *context)
 	return 1;
 }
 
-int fons__tt_loadFont(FONScontext *context, FONSttFontImpl *font, const unsigned char *data, int dataSize)
+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 stbError;
+	int offset, stbError;
 	FONS_NOTUSED(dataSize);
 
 	font->font.userdata = context;
-	stbError = stbtt_InitFont(&font->font, data, 0);
+	offset = stbtt_GetFontOffsetForIndex(data, fontIndex);
+	if (offset == -1) {
+		stbError = 0;
+	} else {
+		stbError = stbtt_InitFont(&font->font, data, offset);
+	}
 	return stbError;
 }
 
@@ -273,7 +315,12 @@ void fons__tt_getFontVMetrics(FONSttFontImpl *font, int *ascent, int *descent, i
 
 float fons__tt_getPixelHeightScale(FONSttFontImpl *font, float size)
 {
+#if 1
+	// Note(DPF) maintain pixel-based units for compat after nanovg update
 	return stbtt_ScaleForPixelHeight(&font->font, size);
+#else
+	return stbtt_ScaleForMappingEmToPixels(&font->font, size);
+#endif
 }
 
 int fons__tt_getGlyphIndex(FONSttFontImpl *font, int codepoint)
@@ -304,7 +351,7 @@ int fons__tt_getGlyphKernAdvance(FONSttFontImpl *font, int glyph1, int glyph2)
 #endif
 
 #ifndef FONS_SCRATCH_BUF_SIZE
-#	define FONS_SCRATCH_BUF_SIZE 16000
+#	define FONS_SCRATCH_BUF_SIZE 96000
 #endif
 #ifndef FONS_HASH_LUT_SIZE
 #	define FONS_HASH_LUT_SIZE 256
@@ -324,6 +371,9 @@ int fons__tt_getGlyphKernAdvance(FONSttFontImpl *font, int glyph1, int glyph2)
 #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)
 {
@@ -361,7 +411,7 @@ struct FONSfont
 {
 	FONSttFontImpl font;
 	char name[64];
-	const unsigned char* data;
+	unsigned char* data;
 	int dataSize;
 	unsigned char freeData;
 	float ascender;
@@ -371,6 +421,8 @@ struct FONSfont
 	int cglyphs;
 	int nglyphs;
 	int lut[FONS_HASH_LUT_SIZE];
+	int fallbacks[FONS_MAX_FALLBACKS];
+	int nfallbacks;
 };
 typedef struct FONSfont FONSfont;
 
@@ -421,6 +473,8 @@ struct FONScontext
 	void* errorUptr;
 };
 
+#ifdef STB_TRUETYPE_IMPLEMENTATION
+
 static void* fons__tmpalloc(size_t size, void* up)
 {
 	unsigned char* ptr;
@@ -446,6 +500,8 @@ static void fons__tmpfree(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.
 
@@ -751,6 +807,27 @@ 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;
@@ -818,7 +895,7 @@ static void fons__freeFont(FONSfont* font)
 {
 	if (font == NULL) return;
 	if (font->glyphs) free(font->glyphs);
-	if (font->freeData && font->data) free((void*)font->data);
+	if (font->freeData && font->data) free(font->data);
 	free(font);
 }
 
@@ -849,12 +926,12 @@ error:
 	return FONS_INVALID;
 }
 
-int fonsAddFont(FONScontext* stash, const char* name, const char* path)
+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;
-	size_t ignore;
 
 	// Read in the font data.
 	fp = fopen(path, "rb");
@@ -864,21 +941,20 @@ int fonsAddFont(FONScontext* stash, const char* name, const char* path)
 	fseek(fp,0,SEEK_SET);
 	data = (unsigned char*)malloc(dataSize);
 	if (data == NULL) goto error;
-	ignore = fread(data, 1, dataSize, fp);
+	readed = fread(data, 1, dataSize, fp);
 	fclose(fp);
 	fp = 0;
+	if (readed != (size_t)dataSize) goto error;
 
-	return fonsAddFontMem(stash, name, data, dataSize, 1);
+	return fonsAddFontMem(stash, name, data, dataSize, 1, fontIndex);
 
 error:
 	if (data) free(data);
 	if (fp) fclose(fp);
 	return FONS_INVALID;
-
-	FONS_NOTUSED(ignore);
 }
 
-int fonsAddFontMem(FONScontext* stash, const char* name, const unsigned char* data, int dataSize, int freeData)
+int fonsAddFontMem(FONScontext* stash, const char* name, unsigned char* data, int dataSize, int freeData, int fontIndex)
 {
 	int i, ascent, descent, fh, lineGap;
 	FONSfont* font;
@@ -903,15 +979,16 @@ int fonsAddFontMem(FONScontext* stash, const char* name, const unsigned char* da
 
 	// Init font
 	stash->nscratch = 0;
-	if (!fons__tt_loadFont(stash, &font->font, data, dataSize)) goto error;
+	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 = (float)(fh + lineGap) / (float)fh;
+	font->lineh = font->ascender - font->descender;
 
 	return idx;
 
@@ -1010,7 +1087,7 @@ static void fons__blur(FONScontext* stash, unsigned char* dst, int w, int h, int
 }
 
 static FONSglyph* fons__getGlyph(FONScontext* stash, FONSfont* font, unsigned int codepoint,
-								 short isize, short iblur)
+								 short isize, short iblur, int bitmapOption)
 {
 	int i, g, advance, lsb, x0, y0, x1, y1, gw, gh, gx, gy, x, y;
 	float scale;
@@ -1020,6 +1097,7 @@ static FONSglyph* fons__getGlyph(FONScontext* stash, FONSfont* font, unsigned in
 	int pad, added;
 	unsigned char* bdst;
 	unsigned char* dst;
+	FONSfont* renderFont = font;
 
 	if (isize < 2) return NULL;
 	if (iblur > 20) iblur = 20;
@@ -1032,32 +1110,66 @@ static FONSglyph* fons__getGlyph(FONScontext* stash, FONSfont* font, unsigned in
 	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)
-			return &font->glyphs[i];
+		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;
 	}
 
-	// Could not find glyph, create it.
-	scale = fons__tt_getPixelHeightScale(&font->font, size);
+	// Create a new glyph or rasterize bitmap data for a cached glyph.
 	g = fons__tt_getGlyphIndex(&font->font, codepoint);
-	fons__tt_buildGlyphBitmap(&font->font, g, size, scale, &advance, &lsb, &x0, &y0, &x1, &y1);
+	// 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;
 
-	// 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);
+	// 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;
 	}
-	if (added == 0) return NULL;
 
 	// Init glyph.
-	glyph = fons__allocGlyph(font);
-	glyph->codepoint = codepoint;
-	glyph->size = isize;
-	glyph->blur = iblur;
+	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;
@@ -1066,15 +1178,14 @@ static FONSglyph* fons__getGlyph(FONScontext* stash, FONSfont* font, unsigned in
 	glyph->xadv = (short)(scale * advance * 10.0f);
 	glyph->xoff = (short)(x0 - pad);
 	glyph->yoff = (short)(y0 - pad);
-	glyph->next = 0;
 
-	// Insert char to hash lookup.
-	glyph->next = font->lut[h];
-	font->lut[h] = font->nglyphs-1;
+	if (bitmapOption == FONS_GLYPH_BITMAP_OPTIONAL) {
+		return glyph;
+	}
 
 	// Rasterize
 	dst = &stash->texData[(glyph->x0+pad) + (glyph->y0+pad) * stash->params.width];
-	fons__tt_renderGlyphBitmap(&font->font, dst, gw-pad*2,gh-pad*2, stash->params.width, scale,scale, g);
+	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];
@@ -1101,7 +1212,7 @@ static FONSglyph* fons__getGlyph(FONScontext* stash, FONSfont* font, unsigned in
 	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);
+		fons__blur(stash, bdst, gw, gh, stash->params.width, iblur);
 	}
 
 	stash->dirtyRect[0] = fons__mini(stash->dirtyRect[0], glyph->x0);
@@ -1134,8 +1245,8 @@ static void fons__getQuad(FONScontext* stash, FONSfont* font,
 	y1 = (float)(glyph->y1-1);
 
 	if (stash->params.flags & FONS_ZERO_TOPLEFT) {
-		rx = (float)(int)(*x + xoff);
-		ry = (float)(int)(*y + yoff);
+		rx = floorf(*x + xoff);
+		ry = floorf(*y + yoff);
 
 		q->x0 = rx;
 		q->y0 = ry;
@@ -1147,8 +1258,8 @@ static void fons__getQuad(FONScontext* stash, FONSfont* font,
 		q->s1 = x1 * stash->itw;
 		q->t1 = y1 * stash->ith;
 	} else {
-		rx = (float)(int)(*x + xoff);
-		ry = (float)(int)(*y - yoff);
+		rx = floorf(*x + xoff);
+		ry = floorf(*y - yoff);
 
 		q->x0 = rx;
 		q->y0 = ry;
@@ -1226,7 +1337,7 @@ float fonsDrawText(FONScontext* stash,
 				   const char* str, const char* end)
 {
 	FONSstate* state = fons__getState(stash);
-	unsigned int codepoint = 0;
+	unsigned int codepoint;
 	unsigned int utf8state = 0;
 	FONSglyph* glyph = NULL;
 	FONSquad q;
@@ -1263,7 +1374,7 @@ float fonsDrawText(FONScontext* stash,
 	for (; str != end; ++str) {
 		if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)str))
 			continue;
-		glyph = fons__getGlyph(stash, font, codepoint, isize, iblur);
+		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);
 
@@ -1286,7 +1397,7 @@ float fonsDrawText(FONScontext* stash,
 }
 
 int fonsTextIterInit(FONScontext* stash, FONStextIter* iter,
-					 float x, float y, const char* str, const char* end)
+					 float x, float y, const char* str, const char* end, int bitmapOption)
 {
 	FONSstate* state = fons__getState(stash);
 	float width;
@@ -1326,6 +1437,7 @@ int fonsTextIterInit(FONScontext* stash, FONStextIter* iter,
 	iter->end = end;
 	iter->codepoint = 0;
 	iter->prevGlyphIndex = -1;
+	iter->bitmapOption = bitmapOption;
 
 	return 1;
 }
@@ -1346,7 +1458,8 @@ int fonsTextIterNext(FONScontext* stash, FONStextIter* iter, FONSquad* quad)
 		// Get glyph and quad
 		iter->x = iter->nextx;
 		iter->y = iter->nexty;
-		glyph = fons__getGlyph(stash, iter->font, iter->codepoint, iter->isize, iter->iblur);
+		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;
@@ -1406,12 +1519,12 @@ void fonsDrawDebug(FONScontext* stash, float x, float y)
 }
 
 float fonsTextBounds(FONScontext* stash,
-					 float x, float y, 
+					 float x, float y,
 					 const char* str, const char* end,
 					 float* bounds)
 {
 	FONSstate* state = fons__getState(stash);
-	unsigned int codepoint = 0;
+	unsigned int codepoint;
 	unsigned int utf8state = 0;
 	FONSquad q;
 	FONSglyph* glyph = NULL;
@@ -1443,7 +1556,7 @@ float fonsTextBounds(FONScontext* stash,
 	for (; str != end; ++str) {
 		if (fons__decutf8(&utf8state, &codepoint, *(const unsigned char*)str))
 			continue;
-		glyph = fons__getGlyph(stash, font, codepoint, isize, iblur);
+		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;
@@ -1568,6 +1681,7 @@ void fonsDeleteInternal(FONScontext* stash)
 	if (stash->texData) free(stash->texData);
 	if (stash->scratch) free(stash->scratch);
 	free(stash);
+	fons__tt_done(stash);
 }
 
 void fonsSetErrorCallback(FONScontext* stash, void (*callback)(void* uptr, int error, int val), void* uptr)
@@ -1594,7 +1708,7 @@ int fonsExpandAtlas(FONScontext* stash, int width, int height)
 	height = fons__maxi(height, stash->params.height);
 
 	if (width == stash->params.width && height == stash->params.height)
-		return 1;	
+		return 1;
 
 	// Flush pending glyphs.
 	fons__flush(stash);

dgl/src/nanovg/nanovg.c

@@ -16,8 +16,11 @@
 // 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"
@@ -63,6 +66,8 @@ enum NVGpointFlags
 };
 
 struct NVGstate {
+	NVGcompositeOperationState compositeOperation;
+	int shapeAntiAlias;
 	NVGpaint fill;
 	NVGpaint stroke;
 	float strokeWidth;
@@ -200,6 +205,84 @@ static void nvg__setDevicePixelRatio(NVGcontext* ctx, float 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;
@@ -280,7 +363,7 @@ void nvgDeleteInternal(NVGcontext* ctx)
 	free(ctx);
 }
 
-void nvgBeginFrame(NVGcontext* ctx, int windowWidth, int windowHeight, float devicePixelRatio)
+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,
@@ -291,8 +374,8 @@ void nvgBeginFrame(NVGcontext* ctx, int windowWidth, int windowHeight, float dev
 	nvgReset(ctx);
 
 	nvg__setDevicePixelRatio(ctx, devicePixelRatio);
-	
-	ctx->params.renderViewport(ctx->params.userPtr, windowWidth, windowHeight);
+
+	ctx->params.renderViewport(ctx->params.userPtr, windowWidth, windowHeight, devicePixelRatio);
 
 	ctx->drawCallCount = 0;
 	ctx->fillTriCount = 0;
@@ -383,7 +466,7 @@ NVGcolor nvgLerpRGBA(NVGcolor c0, NVGcolor c1, float u)
 {
 	int i;
 	float oneminu;
-	NVGcolor cint;
+	NVGcolor cint = {{{0}}};
 
 	u = nvg__clampf(u, 0.0f, 1.0f);
 	oneminu = 1.0f - u;
@@ -391,7 +474,7 @@ NVGcolor nvgLerpRGBA(NVGcolor c0, NVGcolor c1, float u)
 	{
 		cint.rgba[i] = c0.rgba[i] * oneminu + c1.rgba[i] * u;
 	}
-	 
+
 	return cint;
 }
 
@@ -430,12 +513,6 @@ NVGcolor nvgHSLA(float h, float s, float l, unsigned char a)
 	return col;
 }
 
-
-static NVGstate* nvg__getState(NVGcontext* ctx)
-{
-	return &ctx->states[ctx->nstates-1];
-}
-
 void nvgTransformIdentity(float* t)
 {
 	t[0] = 1.0f; t[1] = 0.0f;
@@ -568,6 +645,8 @@ void nvgReset(NVGcontext* ctx)
 
 	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;
@@ -587,6 +666,12 @@ void nvgReset(NVGcontext* ctx)
 }
 
 // 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);
@@ -719,7 +804,7 @@ int nvgCreateImage(NVGcontext* ctx, const char* filename, int imageFlags)
 	return image;
 }
 
-int nvgCreateImageMem(NVGcontext* ctx, int imageFlags, const unsigned char* data, int ndata)
+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);
@@ -913,7 +998,7 @@ void nvgIntersectScissor(NVGcontext* ctx, float x, float y, float w, float h)
 	}
 
 	// Transform the current scissor rect into current transform space.
-	// If there is difference in rotation, this will be approximation. 
+	// 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];
@@ -936,6 +1021,30 @@ void nvgResetScissor(NVGcontext* ctx)
 	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;
@@ -1173,7 +1282,7 @@ static void nvg__tesselateBezier(NVGcontext* ctx,
 {
 	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;
@@ -1205,8 +1314,8 @@ static void nvg__tesselateBezier(NVGcontext* ctx,
 	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); 
+	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)
@@ -1331,7 +1440,8 @@ static void nvg__chooseBevel(int bevel, NVGpoint* p0, NVGpoint* p1, float w,
 }
 
 static NVGvertex* nvg__roundJoin(NVGvertex* dst, NVGpoint* p0, NVGpoint* p1,
-										float lw, float rw, float lu, float ru, int ncap, float fringe)
+								 float lw, float rw, float lu, float ru, int ncap,
+								 float fringe)
 {
 	int i, n;
 	float dlx0 = p0->dy;
@@ -1464,36 +1574,39 @@ static NVGvertex* nvg__bevelJoin(NVGvertex* dst, NVGpoint* p0, NVGpoint* p1,
 }
 
 static NVGvertex* nvg__buttCapStart(NVGvertex* dst, NVGpoint* p,
-										   float dx, float dy, float w, float d, float aa)
+									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, 0,0); dst++;
-	nvg__vset(dst, px - dlx*w - dx*aa, py - dly*w - dy*aa, 1,0); dst++;
-	nvg__vset(dst, px + dlx*w, py + dly*w, 0,1); dst++;
-	nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); 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++;
+	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 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, 0,1); dst++;
-	nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); dst++;
-	nvg__vset(dst, px + dlx*w + dx*aa, py + dly*w + dy*aa, 0,0); dst++;
-	nvg__vset(dst, px - dlx*w + dx*aa, py - dly*w + dy*aa, 1,0); 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++;
+	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 dx, float dy, float w, int ncap,
+									 float aa, float u0, float u1)
 {
 	int i;
 	float px = p->x;
@@ -1504,16 +1617,17 @@ static NVGvertex* nvg__roundCapStart(NVGvertex* dst, NVGpoint* p,
 	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, 0,1); dst++;
+		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, 0,1); dst++;
-	nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); 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 dx, float dy, float w, int ncap,
+								   float aa, float u0, float u1)
 {
 	int i;
 	float px = p->x;
@@ -1521,13 +1635,13 @@ static NVGvertex* nvg__roundCapEnd(NVGvertex* dst, NVGpoint* p,
 	float dlx = dy;
 	float dly = -dx;
 	NVG_NOTUSED(aa);
-	nvg__vset(dst, px + dlx*w, py + dly*w, 0,1); dst++;
-	nvg__vset(dst, px - dlx*w, py - dly*w, 1,1); 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++;
 	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, 0,1); dst++;
+		nvg__vset(dst, px - dlx*ax + dx*ay, py - dly*ax + dy*ay, u0,1); dst++;
 	}
 	return dst;
 }
@@ -1603,15 +1717,24 @@ static void nvg__calculateJoins(NVGcontext* ctx, float w, int lineJoin, float mi
 }
 
 
-static int nvg__expandStroke(NVGcontext* ctx, float w, int lineCap, int lineJoin, float miterLimit)
-{	
+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 = ctx->fringeWidth;
+	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.
@@ -1672,42 +1795,42 @@ static int nvg__expandStroke(NVGcontext* ctx, float w, int lineCap, int lineJoin
 			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);
+				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);
+				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);
+				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, 0, 1, ncap, aa);
+					dst = nvg__roundJoin(dst, p0, p1, w, w, u0, u1, ncap, aa);
 				} else {
-					dst = nvg__bevelJoin(dst, p0, p1, w, w, 0, 1, aa);
+					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), 0,1); dst++;
-				nvg__vset(dst, p1->x - (p1->dmx * w), p1->y - (p1->dmy * w), 1,1); dst++;
+				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, 0,1); dst++;
-			nvg__vset(dst, verts[1].x, verts[1].y, 1,1); dst++;
+			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);
+				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);
+				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);
+				dst = nvg__roundCapEnd(dst, p1, dx, dy, w, ncap, aa, u0, u1);
 		}
 
 		path->nstroke = (int)(dst - verts);
@@ -1868,7 +1991,7 @@ void nvgQuadTo(NVGcontext* ctx, float cx, float cy, float x, float y)
 {
     float x0 = ctx->commandx;
     float y0 = ctx->commandy;
-    float vals[] = { NVG_BEZIERTO, 
+    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 };
@@ -1950,7 +2073,7 @@ void nvgArc(NVGcontext* ctx, float cx, float cy, float r, float a0, float a1, in
 	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; 
+	int move = ctx->ncommands > 0 ? NVG_LINETO : NVG_MOVETO;
 
 	// Clamp angles
 	da = a1 - a0;
@@ -2022,22 +2145,31 @@ void nvgRect(NVGcontext* ctx, float x, float y, float w, float h)
 
 void nvgRoundedRect(NVGcontext* ctx, float x, float y, float w, float h, float r)
 {
-	if (r < 0.1f) {
-		nvgRect(ctx, x,y,w,h);
+	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 rx = nvg__minf(r, nvg__absf(w)*0.5f) * nvg__signf(w), ry = nvg__minf(r, nvg__absf(h)*0.5f) * nvg__signf(h);
+	} 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+ry,
-			NVG_LINETO, x, y+h-ry,
-			NVG_BEZIERTO, x, y+h-ry*(1-NVG_KAPPA90), x+rx*(1-NVG_KAPPA90), y+h, x+rx, y+h,
-			NVG_LINETO, x+w-rx, y+h,
-			NVG_BEZIERTO, x+w-rx*(1-NVG_KAPPA90), y+h, x+w, y+h-ry*(1-NVG_KAPPA90), x+w, y+h-ry,
-			NVG_LINETO, x+w, y+ry,
-			NVG_BEZIERTO, x+w, y+ry*(1-NVG_KAPPA90), x+w-rx*(1-NVG_KAPPA90), y, x+w-rx, y,
-			NVG_LINETO, x+rx, y,
-			NVG_BEZIERTO, x+rx*(1-NVG_KAPPA90), y, x, y+ry*(1-NVG_KAPPA90), x, y+ry,
+			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));
@@ -2092,7 +2224,7 @@ void nvgFill(NVGcontext* ctx)
 	int i;
 
 	nvg__flattenPaths(ctx);
-	if (ctx->params.edgeAntiAlias)
+	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);
@@ -2101,7 +2233,7 @@ void nvgFill(NVGcontext* ctx)
 	fillPaint.innerColor.a *= state->alpha;
 	fillPaint.outerColor.a *= state->alpha;
 
-	ctx->params.renderFill(ctx->params.userPtr, &fillPaint, &state->scissor, ctx->fringeWidth,
+	ctx->params.renderFill(ctx->params.userPtr, &fillPaint, state->compositeOperation, &state->scissor, ctx->fringeWidth,
 						   ctx->cache->bounds, ctx->cache->paths, ctx->cache->npaths);
 
 	// Count triangles
@@ -2122,6 +2254,7 @@ void nvgStroke(NVGcontext* ctx)
 	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.
@@ -2137,12 +2270,12 @@ void nvgStroke(NVGcontext* ctx)
 
 	nvg__flattenPaths(ctx);
 
-	if (ctx->params.edgeAntiAlias)
-		nvg__expandStroke(ctx, strokeWidth*0.5f + ctx->fringeWidth*0.5f, state->lineCap, state->lineJoin, state->miterLimit);
+	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, state->lineCap, state->lineJoin, state->miterLimit);
+		nvg__expandStroke(ctx, strokeWidth*0.5f, 0.0f, state->lineCap, state->lineJoin, state->miterLimit);
 
-	ctx->params.renderStroke(ctx->params.userPtr, &strokePaint, &state->scissor, ctx->fringeWidth,
+	ctx->params.renderStroke(ctx->params.userPtr, &strokePaint, state->compositeOperation, &state->scissor, ctx->fringeWidth,
 							 strokeWidth, ctx->cache->paths, ctx->cache->npaths);
 
 	// Count triangles
@@ -2154,14 +2287,24 @@ void nvgStroke(NVGcontext* ctx)
 }
 
 // Add fonts
-int nvgCreateFont(NVGcontext* ctx, const char* name, const char* path)
+int nvgCreateFont(NVGcontext* ctx, const char* name, const char* filename)
 {
-	return fonsAddFont(ctx->fs, name, path);
+	return fonsAddFont(ctx->fs, name, filename, 0);
 }
 
-int nvgCreateFontMem(NVGcontext* ctx, const char* name, const unsigned char* data, int ndata, int freeData)
+int nvgCreateFontAtIndex(NVGcontext* ctx, const char* name, const char* filename, const int fontIndex)
 {
-	return fonsAddFontMem(ctx->fs, name, data, ndata, freeData);
+	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)
@@ -2170,6 +2313,28 @@ int nvgFindFont(NVGcontext* ctx, const char* name)
 	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)
 {
@@ -2278,7 +2443,7 @@ static void nvg__renderText(NVGcontext* ctx, NVGvertex* verts, int nverts)
 	paint.innerColor.a *= state->alpha;
 	paint.outerColor.a *= state->alpha;
 
-	ctx->params.renderTriangles(ctx->params.userPtr, &paint, &state->scissor, verts, nverts);
+	ctx->params.renderTriangles(ctx->params.userPtr, &paint, state->compositeOperation, &state->scissor, verts, nverts, ctx->fringeWidth);
 
 	ctx->drawCallCount++;
 	ctx->textTriCount += nverts/3;
@@ -2310,17 +2475,17 @@ float nvgText(NVGcontext* ctx, float x, float y, const char* string, const char*
 	verts = nvg__allocTempVerts(ctx, cverts);
 	if (verts == NULL) return x;
 
-	fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end);
+	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 (!nvg__allocTextAtlas(ctx))
-				break; // no memory :(
 			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?
@@ -2343,12 +2508,12 @@ float nvgText(NVGcontext* ctx, float x, float y, const char* string, const char*
 		}
 	}
 
-	// TODO: add back-end bit to do this just once per frame. 
+	// TODO: add back-end bit to do this just once per frame.
 	nvg__flushTextTexture(ctx);
 
 	nvg__renderText(ctx, verts, nverts);
 
-	return iter.x;
+	return iter.nextx / scale;
 }
 
 void nvgTextBox(NVGcontext* ctx, float x, float y, float breakRowWidth, const char* string, const char* end)
@@ -2407,7 +2572,7 @@ int nvgTextGlyphPositions(NVGcontext* ctx, float x, float y, const char* string,
 	fonsSetAlign(ctx->fs, state->textAlign);
 	fonsSetFont(ctx->fs, state->fontId);
 
-	fonsTextIterInit(ctx->fs, &iter, x*scale, y*scale, string, end);
+	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?
@@ -2431,6 +2596,7 @@ 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)
@@ -2472,7 +2638,7 @@ int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, floa
 
 	breakRowWidth *= scale;
 
-	fonsTextIterInit(ctx->fs, &iter, 0, 0, string, end);
+	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?
@@ -2498,7 +2664,15 @@ int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, floa
 				type = NVG_NEWLINE;
 				break;
 			default:
-				type = NVG_CHAR;
+				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;
 		}
 
@@ -2525,12 +2699,12 @@ int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, floa
 		} else {
 			if (rowStart == NULL) {
 				// Skip white space until the beginning of the line
-				if (type == NVG_CHAR) {
+				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; // q.x1 - rowStartX;
+					rowWidth = iter.nextx - rowStartX;
 					rowMinX = q.x0 - rowStartX;
 					rowMaxX = q.x1 - rowStartX;
 					wordStart = iter.str;
@@ -2545,26 +2719,26 @@ int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, floa
 				float nextWidth = iter.nextx - rowStartX;
 
 				// track last non-white space character
-				if (type == NVG_CHAR) {
+				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 && type == NVG_SPACE) {
+				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) {
+				if ((ptype == NVG_SPACE && (type == NVG_CHAR || type == NVG_CJK_CHAR)) || type == NVG_CJK_CHAR) {
 					wordStart = iter.str;
 					wordStartX = iter.x;
-					wordMinX = q.x0 - rowStartX;
+					wordMinX = q.x0;
 				}
 
 				// Break to new line when a character is beyond break width.
-				if (type == NVG_CHAR && nextWidth > breakRowWidth) {
+				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.
@@ -2597,13 +2771,13 @@ int nvgTextBreakLines(NVGcontext* ctx, const char* string, const char* end, floa
 						nrows++;
 						if (nrows >= maxRows)
 							return nrows;
+						// Update row
 						rowStartX = wordStartX;
 						rowStart = wordStart;
 						rowEnd = iter.next;
 						rowWidth = iter.nextx - rowStartX;
-						rowMinX = wordMinX;
+						rowMinX = wordMinX - rowStartX;
 						rowMaxX = q.x1 - rowStartX;
-						// No change to the word start
 					}
 					// Set null break point
 					breakEnd = rowStart;

dgl/src/nanovg/nanovg.h

@@ -79,10 +79,46 @@ enum NVGalign {
 	// 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. 
+	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.
@@ -100,11 +136,12 @@ struct NVGtextRow {
 typedef struct NVGtextRow NVGtextRow;
 
 enum NVGimageFlags {
-	NVG_IMAGE_GENERATE_MIPMAPS		= 1<<0,		// Generate mipmaps during creation of the image.
+    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_PREMULTIPLIED		= 1<<4,		// Image data has premultiplied alpha.
+	NVG_IMAGE_NEAREST			= 1<<5,		// Image interpolation is Nearest instead Linear
 };
 
 // Begin drawing a new frame
@@ -115,7 +152,7 @@ enum NVGimageFlags {
 // 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, int windowWidth, int windowHeight, float devicePixelRatio);
+void nvgBeginFrame(NVGcontext* ctx, float windowWidth, float windowHeight, float devicePixelRatio);
 
 // Cancels drawing the current frame.
 void nvgCancelFrame(NVGcontext* ctx);
@@ -123,6 +160,22 @@ 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
 //
@@ -183,7 +236,10 @@ void nvgReset(NVGcontext* ctx);
 // 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(). 
+// 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);
@@ -231,7 +287,7 @@ void nvgGlobalAlpha(NVGcontext* ctx, float alpha);
 // 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(). 
+// Current coordinate system (transformation) can be saved and restored using nvgSave() and nvgRestore().
 
 // Resets current transform to a identity matrix.
 void nvgResetTransform(NVGcontext* ctx);
@@ -317,7 +373,7 @@ 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, const unsigned char* data, int ndata);
+int nvgCreateImageMem(NVGcontext* ctx, int imageFlags, unsigned char* data, int ndata);
 
 // Creates image from specified image data.
 // Returns handle to the image.
@@ -368,7 +424,7 @@ NVGpaint nvgImagePattern(NVGcontext* ctx, float ox, float oy, float ex, float ey
 // 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. 
+// 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.
@@ -423,7 +479,7 @@ void nvgArcTo(NVGcontext* ctx, float x1, float y1, float x2, float y2, float rad
 // Closes current sub-path with a line segment.
 void nvgClosePath(NVGcontext* ctx);
 
-// Sets the current sub-path winding, see NVGwinding and NVGsolidity. 
+// 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,
@@ -437,10 +493,13 @@ 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. 
+// Creates new circle shaped sub-path.
 void nvgCircle(NVGcontext* ctx, float cx, float cy, float r);
 
 // Fills the current path with current fill style.
@@ -487,13 +546,31 @@ void nvgStroke(NVGcontext* ctx);
 // Returns handle to the font.
 int nvgCreateFont(NVGcontext* ctx, const char* name, const char* filename);
 
-// Creates image by loading it from the specified memory chunk.
+// 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, const unsigned char* data, int ndata, int freeData);
+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);
 
@@ -503,7 +580,7 @@ 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. 
+// 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.
@@ -588,12 +665,12 @@ struct NVGparams {
 	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, int width, int height);
+	void (*renderViewport)(void* uptr, float width, float height, float devicePixelRatio);
 	void (*renderCancel)(void* uptr);
 	void (*renderFlush)(void* uptr);
-	void (*renderFill)(void* uptr, NVGpaint* paint, NVGscissor* scissor, float fringe, const float* bounds, const NVGpath* paths, int npaths);
-	void (*renderStroke)(void* uptr, NVGpaint* paint, NVGscissor* scissor, float fringe, float strokeWidth, const NVGpath* paths, int npaths);
-	void (*renderTriangles)(void* uptr, NVGpaint* paint, NVGscissor* scissor, const NVGvertex* verts, int nverts);
+	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;

dgl/src/nanovg/nanovg_gl.h

@@ -59,6 +59,9 @@ enum NVGcreateFlags {
 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
@@ -66,6 +69,9 @@ void nvgDeleteGL2(NVGcontext* ctx);
 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
@@ -73,6 +79,9 @@ void nvgDeleteGL3(NVGcontext* ctx);
 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
@@ -80,6 +89,9 @@ void nvgDeleteGLES2(NVGcontext* ctx);
 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.
@@ -87,10 +99,6 @@ enum NVGimageFlagsGL {
 	NVG_IMAGE_NODELETE			= 1<<16,	// Do not delete GL texture handle.
 };
 
-int nvglCreateImageFromHandle(NVGcontext* ctx, GLuint textureId, int w, int h, int flags);
-GLuint nvglImageHandle(NVGcontext* ctx, int image);
-
-
 #ifdef __cplusplus
 }
 #endif
@@ -142,6 +150,15 @@ struct GLNVGtexture {
 };
 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,
@@ -158,6 +175,7 @@ struct GLNVGcall {
 	int triangleOffset;
 	int triangleCount;
 	int uniformOffset;
+	GLNVGblend blendFunc;
 };
 typedef struct GLNVGcall GLNVGcall;
 
@@ -248,7 +266,10 @@ struct GLNVGcontext {
 	GLenum stencilFunc;
 	GLint stencilFuncRef;
 	GLuint stencilFuncMask;
+	GLNVGblend blendFunc;
 	#endif
+
+	int dummyTex;
 };
 typedef struct GLNVGcontext GLNVGcontext;
 
@@ -298,7 +319,7 @@ static void glnvg__stencilFunc(GLNVGcontext* gl, GLenum func, GLint ref, GLuint
 	if ((gl->stencilFunc != func) ||
 		(gl->stencilFuncRef != ref) ||
 		(gl->stencilFuncMask != mask)) {
-		
+
 		gl->stencilFunc = func;
 		gl->stencilFuncRef = ref;
 		gl->stencilFuncMask = mask;
@@ -308,6 +329,21 @@ static void glnvg__stencilFunc(GLNVGcontext* gl, GLenum func, GLint ref, GLuint
 	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)
 {
@@ -331,10 +367,10 @@ static GLNVGtexture* glnvg__allocTexture(GLNVGcontext* gl)
 		}
 		tex = &gl->textures[gl->ntextures++];
 	}
-	
+
 	memset(tex, 0, sizeof(*tex));
 	tex->id = ++gl->textureId;
-	
+
 	return tex;
 }
 
@@ -363,8 +399,8 @@ static int glnvg__deleteTexture(GLNVGcontext* gl, int id)
 
 static void glnvg__dumpShaderError(GLuint shader, const char* name, const char* type)
 {
-	char str[512+1];
-	int len = 0;
+	GLchar str[512+1];
+	GLsizei len = 0;
 	glGetShaderInfoLog(shader, 512, &len, str);
 	if (len > 512) len = 512;
 	str[len] = '\0';
@@ -373,8 +409,8 @@ static void glnvg__dumpShaderError(GLuint shader, const char* name, const char*
 
 static void glnvg__dumpProgramError(GLuint prog, const char* name)
 {
-	char str[512+1];
-	int len = 0;
+	GLchar str[512+1];
+	GLsizei len = 0;
 	glGetProgramInfoLog(prog, 512, &len, str);
 	if (len > 512) len = 512;
 	str[len] = '\0';
@@ -466,6 +502,8 @@ static void glnvg__getUniforms(GLNVGshader* shader)
 #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;
@@ -514,7 +552,7 @@ static int glnvg__renderCreate(void* uptr)
 		"	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 = 
+	static const char* fillFragShader =
 		"#ifdef GL_ES\n"
 		"#if defined(GL_FRAGMENT_PRECISION_HIGH) || defined(NANOVG_GL3)\n"
 		" precision highp float;\n"
@@ -592,6 +630,7 @@ static int glnvg__renderCreate(void* uptr)
 		"	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"
@@ -631,9 +670,6 @@ static int glnvg__renderCreate(void* uptr)
 		"		color *= scissor;\n"
 		"		result = color * innerCol;\n"
 		"	}\n"
-		"#ifdef EDGE_AA\n"
-		"	if (strokeAlpha < strokeThr) discard;\n"
-		"#endif\n"
 		"#ifdef NANOVG_GL3\n"
 		"	outColor = result;\n"
 		"#else\n"
@@ -663,11 +699,15 @@ static int glnvg__renderCreate(void* uptr)
 #if NANOVG_GL_USE_UNIFORMBUFFER
 	// Create UBOs
 	glUniformBlockBinding(gl->shader.prog, gl->shader.loc[GLNVG_LOC_FRAG], GLNVG_FRAG_BINDING);
-	glGenBuffers(1, &gl->fragBuf); 
+	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();
@@ -690,7 +730,7 @@ static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, int im
 			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. 
+		// 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;
@@ -722,7 +762,7 @@ static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, int im
 	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)
+#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);
@@ -731,11 +771,24 @@ static int glnvg__renderCreateTexture(void* uptr, int type, int w, int h, int im
 #endif
 
 	if (imageFlags & NVG_IMAGE_GENERATE_MIPMAPS) {
-		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
+		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_MIN_FILTER, GL_LINEAR);
+		glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
 	}
-	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);
@@ -801,7 +854,7 @@ static int glnvg__renderUpdateTexture(void* uptr, int image, int x, int y, int w
 	if (tex->type == NVG_TEXTURE_RGBA)
 		glTexSubImage2D(GL_TEXTURE_2D, 0, x,y, w,h, GL_RGBA, GL_UNSIGNED_BYTE, data);
 	else
-#ifdef NANOVG_GLES2
+#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);
@@ -887,19 +940,30 @@ static int glnvg__convertPaint(GLNVGcontext* gl, GLNVGfragUniforms* frag, NVGpai
 		tex = glnvg__findTexture(gl, paint->image);
 		if (tex == NULL) return 0;
 		if ((tex->flags & NVG_IMAGE_FLIPY) != 0) {
-			float flipped[6];
-			nvgTransformScale(flipped, 1.0f, -1.0f);
-			nvgTransformMultiply(flipped, paint->xform);
-			nvgTransformInverse(invxform, flipped);
+			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;
@@ -917,6 +981,7 @@ 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
@@ -925,19 +990,22 @@ static void glnvg__setUniforms(GLNVGcontext* gl, int uniformOffset, int image)
 #endif
 
 	if (image != 0) {
-		GLNVGtexture* tex = glnvg__findTexture(gl, image);
-		glnvg__bindTexture(gl, tex != NULL ? tex->tex : 0);
-		glnvg__checkError(gl, "tex paint tex");
-	} else {
-		glnvg__bindTexture(gl, 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, int width, int height)
+static void glnvg__renderViewport(void* uptr, float width, float height, float devicePixelRatio)
 {
+	NVG_NOTUSED(devicePixelRatio);
 	GLNVGcontext* gl = (GLNVGcontext*)uptr;
-	gl->view[0] = (float)width;
-	gl->view[1] = (float)height;
+	gl->view[0] = width;
+	gl->view[1] = height;
 }
 
 static void glnvg__fill(GLNVGcontext* gl, GLNVGcall* call)
@@ -979,7 +1047,7 @@ static void glnvg__fill(GLNVGcontext* gl, GLNVGcall* call)
 	// Draw fill
 	glnvg__stencilFunc(gl, GL_NOTEQUAL, 0x0, 0xff);
 	glStencilOp(GL_ZERO, GL_ZERO, GL_ZERO);
-	glDrawArrays(GL_TRIANGLES, call->triangleOffset, call->triangleCount);
+	glDrawArrays(GL_TRIANGLE_STRIP, call->triangleOffset, call->triangleCount);
 
 	glDisable(GL_STENCIL_TEST);
 }
@@ -992,12 +1060,12 @@ static void glnvg__convexFill(GLNVGcontext* gl, GLNVGcall* call)
 	glnvg__setUniforms(gl, call->uniformOffset, call->image);
 	glnvg__checkError(gl, "convex fill");
 
-	for (i = 0; i < npaths; i++)
+	for (i = 0; i < npaths; i++) {
 		glDrawArrays(GL_TRIANGLE_FAN, paths[i].fillOffset, paths[i].fillCount);
-	if (gl->flags & NVG_ANTIALIAS) {
 		// Draw fringes
-		for (i = 0; i < npaths; i++)
+		if (paths[i].strokeCount > 0) {
 			glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
+		}
 	}
 }
 
@@ -1026,7 +1094,7 @@ static void glnvg__stroke(GLNVGcontext* gl, GLNVGcall* call)
 		for (i = 0; i < npaths; i++)
 			glDrawArrays(GL_TRIANGLE_STRIP, paths[i].strokeOffset, paths[i].strokeCount);
 
-		// Clear stencil buffer.		
+		// 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);
@@ -1064,6 +1132,50 @@ static void glnvg__renderCancel(void* uptr) {
 	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;
@@ -1074,7 +1186,6 @@ static void glnvg__renderFlush(void* uptr)
 		// Setup require GL state.
 		glUseProgram(gl->shader.prog);
 
-		glBlendFunc(GL_ONE, GL_ONE_MINUS_SRC_ALPHA);
 		glEnable(GL_CULL_FACE);
 		glCullFace(GL_BACK);
 		glFrontFace(GL_CCW);
@@ -1093,6 +1204,10 @@ static void glnvg__renderFlush(void* uptr)
 		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
@@ -1122,6 +1237,7 @@ static void glnvg__renderFlush(void* uptr)
 
 		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)
@@ -1136,9 +1252,9 @@ static void glnvg__renderFlush(void* uptr)
 		glDisableVertexAttribArray(1);
 #if defined NANOVG_GL3
 		glBindVertexArray(0);
-#endif	
+#endif
 		glDisable(GL_CULL_FACE);
-		glBindBuffer(GL_ARRAY_BUFFER, 0);
+			glBindBuffer(GL_ARRAY_BUFFER, 0);
 		glUseProgram(0);
 		glnvg__bindTexture(gl, 0);
 	}
@@ -1237,7 +1353,7 @@ static void glnvg__vset(NVGvertex* vtx, float x, float y, float u, float v)
 	vtx->v = v;
 }
 
-static void glnvg__renderFill(void* uptr, NVGpaint* paint, NVGscissor* scissor, float fringe,
+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;
@@ -1249,16 +1365,21 @@ static void glnvg__renderFill(void* uptr, NVGpaint* paint, NVGscissor* scissor,
 	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) + 6;
+	maxverts = glnvg__maxVertCount(paths, npaths) + call->triangleCount;
 	offset = glnvg__allocVerts(gl, maxverts);
 	if (offset == -1) goto error;
 
@@ -1280,20 +1401,16 @@ static void glnvg__renderFill(void* uptr, NVGpaint* paint, NVGscissor* scissor,
 		}
 	}
 
-	// Quad
-	call->triangleOffset = offset;
-	call->triangleCount = 6;
-	quad = &gl->verts[call->triangleOffset];
-	glnvg__vset(&quad[0], bounds[0], bounds[3], 0.5f, 1.0f);
-	glnvg__vset(&quad[1], bounds[2], bounds[3], 0.5f, 1.0f);
-	glnvg__vset(&quad[2], bounds[2], bounds[1], 0.5f, 1.0f);
-
-	glnvg__vset(&quad[3], bounds[0], bounds[3], 0.5f, 1.0f);
-	glnvg__vset(&quad[4], bounds[2], bounds[1], 0.5f, 1.0f);
-	glnvg__vset(&quad[5], bounds[0], bounds[1], 0.5f, 1.0f);
-
 	// 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
@@ -1318,7 +1435,7 @@ error:
 	if (gl->ncalls > 0) gl->ncalls--;
 }
 
-static void glnvg__renderStroke(void* uptr, NVGpaint* paint, NVGscissor* scissor, float fringe,
+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;
@@ -1332,6 +1449,7 @@ static void glnvg__renderStroke(void* uptr, NVGpaint* paint, NVGscissor* scissor
 	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);
@@ -1373,8 +1491,8 @@ error:
 	if (gl->ncalls > 0) gl->ncalls--;
 }
 
-static void glnvg__renderTriangles(void* uptr, NVGpaint* paint, NVGscissor* scissor,
-								   const NVGvertex* verts, int nverts)
+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);
@@ -1384,6 +1502,7 @@ static void glnvg__renderTriangles(void* uptr, NVGpaint* paint, NVGscissor* scis
 
 	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);
@@ -1396,7 +1515,7 @@ static void glnvg__renderTriangles(void* uptr, NVGpaint* paint, NVGscissor* scis
 	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, 1.0f, -1.0f);
+	glnvg__convertPaint(gl, frag, paint, scissor, 1.0f, fringe, -1.0f);
 	frag->type = NSVG_SHADER_IMG;
 
 	return;
@@ -1499,7 +1618,15 @@ void nvgDeleteGLES3(NVGcontext* ctx)
 	nvgDeleteInternal(ctx);
 }
 
-int nvglCreateImageFromHandle(NVGcontext* ctx, GLuint textureId, int w, int h, int imageFlags)
+#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);
@@ -1515,7 +1642,15 @@ int nvglCreateImageFromHandle(NVGcontext* ctx, GLuint textureId, int w, int h, i
 	return tex->id;
 }
 
-GLuint nvglImageHandle(NVGcontext* ctx, int image)
+#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);

dgl/src/nanovg/nanovg_gl_utils.h

@@ -30,7 +30,7 @@ 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(NVGcontext* ctx, NVGLUframebuffer* fb);
+void nvgluDeleteFramebuffer(NVGLUframebuffer* fb);
 
 #endif // NANOVG_GL_UTILS_H
 
@@ -64,7 +64,18 @@ NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int w, int h, int imag
 	memset(fb, 0, sizeof(NVGLUframebuffer));
 
 	fb->image = nvgCreateImageRGBA(ctx, w, h, imageFlags | NVG_IMAGE_FLIPY | NVG_IMAGE_PREMULTIPLIED, NULL);
-	fb->texture = nvglImageHandle(ctx, fb->image);
+
+#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);
@@ -79,7 +90,18 @@ NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int w, int h, int imag
 	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) goto error;
+	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);
@@ -87,7 +109,7 @@ NVGLUframebuffer* nvgluCreateFramebuffer(NVGcontext* ctx, int w, int h, int imag
 error:
 	glBindFramebuffer(GL_FRAMEBUFFER, defaultFBO);
 	glBindRenderbuffer(GL_RENDERBUFFER, defaultRBO);
-	nvgluDeleteFramebuffer(ctx, fb);
+	nvgluDeleteFramebuffer(fb);
 	return NULL;
 #else
 	NVG_NOTUSED(ctx);
@@ -108,7 +130,7 @@ void nvgluBindFramebuffer(NVGLUframebuffer* fb)
 #endif
 }
 
-void nvgluDeleteFramebuffer(NVGcontext* ctx, NVGLUframebuffer* fb)
+void nvgluDeleteFramebuffer(NVGLUframebuffer* fb)
 {
 #ifdef NANOVG_FBO_VALID
 	if (fb == NULL) return;
@@ -117,14 +139,14 @@ void nvgluDeleteFramebuffer(NVGcontext* ctx, NVGLUframebuffer* fb)
 	if (fb->rbo != 0)
 		glDeleteRenderbuffers(1, &fb->rbo);
 	if (fb->image >= 0)
-		nvgDeleteImage(ctx, fb->image);
+		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(ctx);
 	NVG_NOTUSED(fb);
 #endif
 }