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using SpriteFontPlus.Utility;
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using StbTrueTypeSharp;
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using System;
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using System.Collections.Generic;
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using System.IO;
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using System.Linq;
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namespace SpriteFontPlus
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{
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public static class TtfFontBaker
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{
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public static TtfFontBakerResult Bake(Stream ttfStream, float fontPixelHeight,
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int bitmapWidth, int bitmapHeight,
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IEnumerable<CharacterRange> characterRanges)
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{
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return Bake(ttfStream.ToByteArray(), fontPixelHeight, bitmapWidth, bitmapHeight, characterRanges);
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}
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public unsafe static TtfFontBakerResult Bake(byte[] ttf, float fontPixelHeight,
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int bitmapWidth, int bitmapHeight,
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IEnumerable<CharacterRange> characterRanges)
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{
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if (ttf == null || ttf.Length == 0)
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{
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throw new ArgumentNullException(nameof(ttf));
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}
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if (fontPixelHeight <= 0)
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{
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throw new ArgumentOutOfRangeException(nameof(fontPixelHeight));
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}
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if (bitmapWidth <= 0)
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{
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throw new ArgumentOutOfRangeException(nameof(bitmapWidth));
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}
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if (bitmapHeight <= 0)
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{
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throw new ArgumentOutOfRangeException(nameof(bitmapHeight));
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}
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if (characterRanges == null)
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{
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throw new ArgumentNullException(nameof(characterRanges));
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}
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if (!characterRanges.Any())
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{
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throw new ArgumentException("characterRanges must have a least one value.");
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}
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byte[] pixels;
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var glyphs = new Dictionary<int, GlyphInfo>();
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StbTrueType.stbtt_fontinfo fontInfo = new StbTrueType.stbtt_fontinfo();
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fixed (byte* ttfPtr = ttf)
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{
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if (StbTrueType.stbtt_InitFont(fontInfo, ttfPtr, 0) == 0)
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{
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throw new Exception("Failed to init font.");
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}
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}
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float scaleFactor = StbTrueType.stbtt_ScaleForPixelHeight(fontInfo, fontPixelHeight);
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int ascent, descent, lineGap;
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StbTrueType.stbtt_GetFontVMetrics(fontInfo, &ascent, &descent, &lineGap);
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pixels = new byte[bitmapWidth * bitmapHeight];
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StbTrueType.stbtt_pack_context pc = new StbTrueType.stbtt_pack_context();
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fixed (byte* ttfPtr = ttf)
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fixed (byte* pixelsPtr = pixels)
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{
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StbTrueType.stbtt_PackBegin(pc, pixelsPtr, bitmapWidth,
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bitmapHeight, bitmapWidth, 1, null);
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foreach (var range in characterRanges)
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{
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if (range.Start > range.End)
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{
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continue;
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}
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var cd = new StbTrueType.stbtt_packedchar[range.End - range.Start + 1];
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for (var i = 0; i < cd.Length; ++i)
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{
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cd[i] = new StbTrueType.stbtt_packedchar();
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}
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fixed (StbTrueType.stbtt_packedchar* cdPtr = cd)
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{
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StbTrueType.stbtt_PackFontRange(pc, ttfPtr, 0, fontPixelHeight,
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range.Start,
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range.End - range.Start + 1,
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cdPtr);
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}
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for (var i = 0; i < cd.Length; ++i)
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{
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var yOff = cd[i].yoff;
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yOff += ascent * scaleFactor;
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var glyphInfo = new GlyphInfo
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{
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X = cd[i].x0,
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Y = cd[i].y0,
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Width = cd[i].x1 - cd[i].x0,
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Height = cd[i].y1 - cd[i].y0,
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XOffset = (int)cd[i].xoff,
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YOffset = (int)Math.Round(yOff),
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XAdvance = (int)Math.Round(cd[i].xadvance)
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};
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glyphs[(char)(i + range.Start)] = glyphInfo;
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}
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}
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}
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return new TtfFontBakerResult(glyphs, fontPixelHeight, pixels, bitmapWidth, bitmapHeight);
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}
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}
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}
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