Code refactoring for #299.

This commit fixes the formats as suggested in #299 and fixes stack overflow when using `freetype` backend.

example/demo.c

@@ -839,8 +839,8 @@ int loadDemoData(NVGcontext* vg, DemoData* data)
 		printf("Could not add font emoji.\n");
 		return -1;
 	}
-	nvgAddFallbackFontId(vg,data->fontNormal,data->fontEmoji);
-	nvgAddFallbackFontId(vg,data->fontBold,data->fontEmoji);
+	nvgAddFallbackFontId(vg, data->fontNormal, data->fontEmoji);
+	nvgAddFallbackFontId(vg, data->fontBold, data->fontEmoji);
 
 	return 0;
 }

example/demo.h

@@ -8,7 +8,7 @@ extern "C" {
 #endif
 
 struct DemoData {
-	int fontNormal, fontBold, fontIcons,fontEmoji; 
+	int fontNormal, fontBold, fontIcons, fontEmoji;
 	int images[12];
 };
 typedef struct DemoData DemoData;

src/fontstash.h

@@ -193,15 +193,17 @@ int fons__tt_buildGlyphBitmap(FONSttFontImpl *font, int glyph, float size, float
 {
 	FT_Error ftError;
 	FT_GlyphSlot ftGlyph;
+	FT_Fixed advFixed;
 	FONS_NOTUSED(scale);
 
 	ftError = FT_Set_Pixel_Sizes(font->font, 0, (FT_UInt)(size * (float)font->font->units_per_EM / (float)(font->font->ascender - font->font->descender)));
 	if (ftError) return 0;
 	ftError = FT_Load_Glyph(font->font, glyph, FT_LOAD_RENDER);
 	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;
+	*advance = (int)advFixed;
 	*lsb = (int)ftGlyph->metrics.horiBearingX;
 	*x0 = ftGlyph->bitmap_left;
 	*x1 = *x0 + ftGlyph->bitmap.width;
@@ -360,7 +362,6 @@ struct FONSglyph
 };
 typedef struct FONSglyph FONSglyph;
 
-
 struct FONSfont
 {
 	FONSttFontImpl font;
@@ -761,11 +762,10 @@ static FONSstate* fons__getState(FONScontext* stash)
 	return &stash->states[stash->nstates-1];
 }
 
-int fonsAddFallbackFont(FONScontext* stash,int base,int fallback)
+int fonsAddFallbackFont(FONScontext* stash, int base, int fallback)
 {
 	FONSfont* baseFont = stash->fonts[base];
-	if (baseFont->nfallbacks < FONS_MAX_FALLBACKS)
-	{
+	if (baseFont->nfallbacks < FONS_MAX_FALLBACKS) {
 		baseFont->fallbacks[baseFont->nfallbacks++] = fallback;
 		return 1;
 	}
@@ -1058,15 +1058,12 @@ static FONSglyph* fons__getGlyph(FONScontext* stash, FONSfont* font, unsigned in
 	// Could not find glyph, create it.
 	scale = fons__tt_getPixelHeightScale(&font->font, size);
 	g = fons__tt_getGlyphIndex(&font->font, codepoint);
-	//If tofu glyph fallback to other fonts
-	if(g == 0)
-	{
-		for (i=0; i<font->nfallbacks; ++i)
-		{
-			glyph = fons__getGlyph(stash,stash->fonts[font->fallbacks[i]],codepoint,isize,iblur);
-			if(glyph->index != 0)
-			{
-				return glyph;
+	// Try to find the glyph in fallback fonts.
+	if (g == 0) {
+		for (i = 0; i < font->nfallbacks; ++i) {
+			FONSglyph* fallbackGlyph = fons__getGlyph(stash, stash->fonts[font->fallbacks[i]], codepoint, isize, iblur);
+			if (fallbackGlyph != NULL && fallbackGlyph->index != 0) {
+				return fallbackGlyph;
 			}
 		}
 	}

src/nanovg.c

@@ -2268,18 +2268,15 @@ int nvgFindFont(NVGcontext* ctx, const char* name)
 }
 
 
-int nvgAddFallbackFontId(NVGcontext* ctx,int baseFont,int fallbackFont)
+int nvgAddFallbackFontId(NVGcontext* ctx, int baseFont, int fallbackFont)
 {
-	if(baseFont == -1 || fallbackFont == -1)
-	{
-		return 0;
-	}
-	return fonsAddFallbackFont(ctx->fs, baseFont,fallbackFont);
+	if(baseFont == -1 || fallbackFont == -1) return 0;
+	return fonsAddFallbackFont(ctx->fs, baseFont, fallbackFont);
 }
 
-int nvgAddFallbackFont(NVGcontext* ctx,const char* baseFont,const char* fallbackFont)
+int nvgAddFallbackFont(NVGcontext* ctx, const char* baseFont, const char* fallbackFont)
 {
-	return nvgAddFallbackFontId(ctx,nvgFindFont(ctx,baseFont),nvgFindFont(ctx,fallbackFont));
+	return nvgAddFallbackFontId(ctx, nvgFindFont(ctx, baseFont), nvgFindFont(ctx, fallbackFont));
 }
 
 // State setting

src/nanovg.h

@@ -546,11 +546,11 @@ int nvgCreateFontMem(NVGcontext* ctx, const char* name, unsigned char* data, int
 // 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);
 
-// add fallback font.
-int nvgAddFallbackFontId(NVGcontext* ctx,int baseFont,int fallbackFont);
+// Adds a fallback font by handle.
+int nvgAddFallbackFontId(NVGcontext* ctx, int baseFont, int fallbackFont);
 
-// add fallback font by name.
-int nvgAddFallbackFont(NVGcontext* ctx,const char* baseFont,const char* fallbackFont);
+// Adds a fallback font by name.
+int nvgAddFallbackFont(NVGcontext* ctx, const char* baseFont, const char* fallbackFont);
 
 // Sets the font size of current text style.
 void nvgFontSize(NVGcontext* ctx, float size);