public void Begin(int width, int height) { bitmapWidth = width; bitmapHeight = height; _bitmap = new byte[width * height]; _context = new StbTrueType.stbtt_pack_context(); fixed(byte *pixelsPtr = _bitmap) { StbTrueType.stbtt_PackBegin(_context, pixelsPtr, width, height, width, 1, null); } _glyphs = new Dictionary <int, GlyphInfo>(); }
public void Add(byte[] ttf, float fontPixelHeight, IEnumerable <CharacterRange> characterRanges) { if (ttf == null || ttf.Length == 0) { throw new ArgumentNullException(nameof(ttf)); } if (fontPixelHeight <= 0) { throw new ArgumentOutOfRangeException(nameof(fontPixelHeight)); } if (characterRanges == null) { throw new ArgumentNullException(nameof(characterRanges)); } if (!characterRanges.Any()) throw new ArgumentException("characterRanges must have a least one value."); fixed(byte *ttfPtr = ttf) { var fontInfo = new StbTrueType.stbtt_fontinfo(); if (StbTrueType.stbtt_InitFont(fontInfo, ttfPtr, 0) == 0) { throw new Exception("Failed to init font."); } var scaleFactor = StbTrueType.stbtt_ScaleForPixelHeight(fontInfo, fontPixelHeight); int ascent, descent, lineGap; StbTrueType.stbtt_GetFontVMetrics(fontInfo, &ascent, &descent, &lineGap); foreach (var range in characterRanges) { if (range.Start > range.End) { continue; } var cd = new StbTrueType.stbtt_packedchar[range.End - range.Start + 1]; fixed(StbTrueType.stbtt_packedchar *chardataPtr = cd) { StbTrueType.stbtt_PackFontRange(_context, ttfPtr, 0, fontPixelHeight, range.Start, range.End - range.Start + 1, chardataPtr); } for (var i = 0; i < cd.Length; ++i) { var yOff = cd[i].yoff; yOff += ascent * scaleFactor; var glyphInfo = new GlyphInfo { X = cd[i].x0, Y = cd[i].y0, Width = cd[i].x1 - cd[i].x0, Height = cd[i].y1 - cd[i].y0, XOffset = (int)cd[i].xoff, YOffset = (int)Math.Round(yOff), XAdvance = (int)Math.Round(cd[i].xadvance) }; _glyphs[i + range.Start] = glyphInfo; } } } }