示例#1
0
        public static unsafe void CompareMetricsWithStb(Font f, DrawableFontAtlas atlas, StbTrueType.stbtt_fontinfo stbFont)
        {
            var pc = new StbTrueType.stbtt_pack_context();

            StbTrueType.stbtt_PackBegin(pc, (byte *)0, 512, 512, 512, 1, null);

            var cd = new StbTrueType.stbtt_packedchar[f.LastCharIndex + 1];

            StbTrueType.stbrp_rect[] rects;
            fixed(StbTrueType.stbtt_packedchar *charDataPtr = &cd[0])
            {
                var range = new StbTrueType.stbtt_pack_range
                {
                    first_unicode_codepoint_in_range = 0,
                    array_of_unicode_codepoints      = null,
                    num_chars          = (int)f.LastCharIndex + 1,
                    chardata_for_range = charDataPtr,
                    font_size          = -atlas.FontSize
                };

                rects = new StbTrueType.stbrp_rect[f.LastCharIndex + 1];
                fixed(StbTrueType.stbrp_rect *rectPtr = &rects[0])
                {
                    int n = StbTrueType.stbtt_PackFontRangesGatherRects(pc, stbFont, &range, 1, rectPtr);

                    StbTrueType.stbtt_PackFontRangesPackRects(pc, rectPtr, n);
                }
            }

            foreach ((char charIndex, DrawableGlyph atlasGlyph) in atlas.Glyphs)
            {
                FontGlyph glyph = atlasGlyph.FontGlyph;

                var advance = 0;
                var bearing = 0;
                StbTrueType.stbtt_GetCodepointHMetrics(stbFont, charIndex, &advance, &bearing);
                Assert.True(advance == glyph.AdvanceWidth);
                Assert.True(bearing == glyph.LeftSideBearing || glyph.LeftSideBearing == 0); // stb has junk data beyond valid

                var minX = 0;
                var maxX = 0;
                var minY = 0;
                var maxY = 0;
                StbTrueType.stbtt_GetCodepointBitmapBoxSubpixel(stbFont, charIndex, atlas.RenderScale, atlas.RenderScale, 0, 0, &minX, &minY, &maxX, &maxY);

                Rectangle bbox = glyph.GetBBox(atlas.RenderScale);

                Assert.Equal(minX, bbox.X);
                Assert.Equal(minY, bbox.Y);
                Assert.Equal(maxX, bbox.Width);
                Assert.Equal(maxY, bbox.Height);

                Rectangle drawBox = new Rectangle(0, 0, bbox.Width - bbox.X, bbox.Height - bbox.Y);
                drawBox.Size += Vector2.One; // Add padding from stb
                StbTrueType.stbrp_rect rect = rects[charIndex];
                Assert.Equal(rect.w, drawBox.Width);
                Assert.Equal(rect.h, drawBox.Height);
            }
        }
示例#2
0
        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>();
        }
示例#3
0
        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);
        }
示例#4
0
        public 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>();

            fixed(byte *ttfPtr = ttf)
            {
                StbTrueType.stbtt_fontinfo fontInfo = new StbTrueType.stbtt_fontinfo();
                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 *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];
                    fixed(StbTrueType.stbtt_packedchar *chardataPtr = cd)
                    {
                        StbTrueType.stbtt_PackFontRange(pc, 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[(char)(i + range.Start)] = glyphInfo;
                    }
                }
            }

            return(new TtfFontBakerResult(glyphs, fontPixelHeight, pixels, bitmapWidth, bitmapHeight));
        }