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Commit Description:
Attribute Iosevka and fix links.
Commit Description:
Attribute Iosevka and fix links.
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SpriteFontPlus/src/TtfFontBaker.cs
123 lines | 3.1 KiB | text/x-csharp | CSharpLexer
123 lines | 3.1 KiB | text/x-csharp | CSharpLexer
| r0 | using SpriteFontPlus.Utility; | ||
| using StbTrueTypeSharp; | |||
| using System; | |||
| using System.Collections.Generic; | |||
| using System.IO; | |||
| using System.Linq; | |||
| namespace SpriteFontPlus | |||
| { | |||
| public static class TtfFontBaker | |||
| { | |||
| public static TtfFontBakerResult Bake(Stream ttfStream, float fontPixelHeight, | |||
| int bitmapWidth, int bitmapHeight, | |||
| IEnumerable<CharacterRange> characterRanges) | |||
| { | |||
| return Bake(ttfStream.ToByteArray(), fontPixelHeight, bitmapWidth, bitmapHeight, characterRanges); | |||
| } | |||
| public unsafe static TtfFontBakerResult Bake(byte[] ttf, float fontPixelHeight, | |||
| int bitmapWidth, int bitmapHeight, | |||
| IEnumerable<CharacterRange> characterRanges) | |||
| { | |||
| if (ttf == null || ttf.Length == 0) | |||
| { | |||
| throw new ArgumentNullException(nameof(ttf)); | |||
| } | |||
| if (fontPixelHeight <= 0) | |||
| { | |||
| throw new ArgumentOutOfRangeException(nameof(fontPixelHeight)); | |||
| } | |||
| if (bitmapWidth <= 0) | |||
| { | |||
| throw new ArgumentOutOfRangeException(nameof(bitmapWidth)); | |||
| } | |||
| if (bitmapHeight <= 0) | |||
| { | |||
| throw new ArgumentOutOfRangeException(nameof(bitmapHeight)); | |||
| } | |||
| if (characterRanges == null) | |||
| { | |||
| throw new ArgumentNullException(nameof(characterRanges)); | |||
| } | |||
| if (!characterRanges.Any()) | |||
| { | |||
| throw new ArgumentException("characterRanges must have a least one value."); | |||
| } | |||
| byte[] pixels; | |||
| var glyphs = new Dictionary<int, GlyphInfo>(); | |||
| StbTrueType.stbtt_fontinfo fontInfo = new StbTrueType.stbtt_fontinfo(); | |||
| fixed (byte* ttfPtr = ttf) | |||
| { | |||
| if (StbTrueType.stbtt_InitFont(fontInfo, ttfPtr, 0) == 0) | |||
| { | |||
| throw new Exception("Failed to init font."); | |||
| } | |||
| } | |||
| float scaleFactor = StbTrueType.stbtt_ScaleForPixelHeight(fontInfo, fontPixelHeight); | |||
| int ascent, descent, lineGap; | |||
| StbTrueType.stbtt_GetFontVMetrics(fontInfo, &ascent, &descent, &lineGap); | |||
| pixels = new byte[bitmapWidth * bitmapHeight]; | |||
| StbTrueType.stbtt_pack_context pc = new StbTrueType.stbtt_pack_context(); | |||
| fixed (byte* ttfPtr = ttf) | |||
| fixed (byte* pixelsPtr = pixels) | |||
| { | |||
| StbTrueType.stbtt_PackBegin(pc, pixelsPtr, bitmapWidth, | |||
| bitmapHeight, bitmapWidth, 1, null); | |||
| foreach (var range in characterRanges) | |||
| { | |||
| if (range.Start > range.End) | |||
| { | |||
| continue; | |||
| } | |||
| var cd = new StbTrueType.stbtt_packedchar[range.End - range.Start + 1]; | |||
| for (var i = 0; i < cd.Length; ++i) | |||
| { | |||
| cd[i] = new StbTrueType.stbtt_packedchar(); | |||
| } | |||
| fixed (StbTrueType.stbtt_packedchar* cdPtr = cd) | |||
| { | |||
| StbTrueType.stbtt_PackFontRange(pc, ttfPtr, 0, fontPixelHeight, | |||
| range.Start, | |||
| range.End - range.Start + 1, | |||
| cdPtr); | |||
| } | |||
| 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[(char)(i + range.Start)] = glyphInfo; | |||
| } | |||
| } | |||
| } | |||
| return new TtfFontBakerResult(glyphs, fontPixelHeight, pixels, bitmapWidth, bitmapHeight); | |||
| } | |||
| } | |||
| } |
