public static unsafe DrawableFontAtlas RenderFontStbPacked(byte[] ttf, float fontSize, Vector2 atlasSize, int numChars, Font f, out StbTrueType.stbtt_fontinfo fontInfo) { var atlasObj = new DrawableFontAtlas(f, fontSize); fontSize = atlasObj.FontSize; fontInfo = new StbTrueType.stbtt_fontinfo(); fixed(byte *ttPtr = &ttf[0]) { StbTrueType.stbtt_InitFont(fontInfo, ttPtr, 0); float scaleFactor = StbTrueType.stbtt_ScaleForMappingEmToPixels(fontInfo, fontSize); int ascent, descent, lineGap; StbTrueType.stbtt_GetFontVMetrics(fontInfo, &ascent, &descent, &lineGap); atlasSize *= 3; // Needs to be big as the packing sucks, and glyphs getting cut out messes with the tests. var pixels = new byte[(int)atlasSize.X * (int)atlasSize.Y]; var pc = new StbTrueType.stbtt_pack_context(); fixed(byte *pixelsPtr = pixels) { StbTrueType.stbtt_PackBegin(pc, pixelsPtr, (int)atlasSize.X, (int)atlasSize.Y, (int)atlasSize.X, 1, null); } var cd = new StbTrueType.stbtt_packedchar[numChars]; fixed(StbTrueType.stbtt_packedchar *charPtr = cd) { StbTrueType.stbtt_PackFontRange(pc, ttPtr, 0, -fontSize, 0, numChars, charPtr); } StbTrueType.stbtt_PackEnd(pc); for (var i = 0; i < cd.Length; ++i) { var atlasGlyph = DrawableGlyph.CreateForTest(cd[i].xadvance, cd[i].xoff, cd[i].x1 - cd[i].x0, cd[i].y1 - cd[i].y0); atlasGlyph.GlyphUV = new Rectangle(cd[i].x0, cd[i].y0, atlasGlyph.Width, atlasGlyph.Height); atlasObj.Glyphs[(char)i] = atlasGlyph; } } return(atlasObj); }