public unsafe void Append(TextAnalyzer analyzer, FontFace font, string text) { var layout = new TextLayout(); var format = new TextFormat { Font = font, Size = 32.0f }; analyzer.AppendText(text, format); analyzer.PerformLayout(0, 32, 1000, 1000, layout); var memBlock = new MemoryBlock(text.Length * 6 * PosColorTexture.Layout.Stride); var mem = (PosColorTexture*)memBlock.Data; foreach (var thing in layout.Stuff) { var width = thing.Width; var height = thing.Height; var region = new Vector4(thing.SourceX, thing.SourceY, width, height) / 4096; var origin = new Vector2(thing.DestX, thing.DestY); *mem++ = new PosColorTexture(origin + new Vector2(0, height), new Vector2(region.X, region.Y + region.W), unchecked((int)0xff000000)); *mem++ = new PosColorTexture(origin + new Vector2(width, height), new Vector2(region.X + region.Z, region.Y + region.W), unchecked((int)0xff000000)); *mem++ = new PosColorTexture(origin + new Vector2(width, 0), new Vector2(region.X + region.Z, region.Y), unchecked((int)0xff000000)); *mem++ = new PosColorTexture(origin, new Vector2(region.X, region.Y), unchecked((int)0xff000000)); count++; } vertexBuffer = new DynamicVertexBuffer(memBlock, PosColorTexture.Layout); }
public void AppendText(char[] text, int startIndex, int count, TextFormat format) { fixed(char *ptr = text) AppendText(ptr + startIndex, count, format); }
public void AppendText(char *text, int count, TextFormat format) { // look up the cache entry for the given font and size CachedFace cachedFace; var font = format.Font; var size = FontFace.ComputePixelSize(format.Size, Dpi); var key = new CacheKey(font.Id, size); if (!cache.TryGetValue(key, out cachedFace)) { cache.Add(key, cachedFace = new CachedFace(font, size)); } // process each character in the string var nextBreak = BreakCategory.None; var previous = new CodePoint(); char *end = text + count; while (text != end) { // handle surrogate pairs properly CodePoint codePoint; char c = *text++; if (char.IsSurrogate(c) && text != end) { codePoint = new CodePoint(c, *text++); } else { codePoint = c; } // ignore linefeeds directly after a carriage return if (c == '\n' && (char)previous == '\r') { continue; } // get the glyph data CachedGlyph glyph; if (!cachedFace.Glyphs.TryGetValue(codePoint, out glyph) && !char.IsControl(c)) { var data = font.GetGlyph(codePoint, size); var width = data.RenderWidth; var height = data.RenderHeight; if (width > atlas.Width || height > atlas.Height) { throw new InvalidOperationException("Glyph is larger than the size of the provided atlas."); } var rect = new Rect(); if (width > 0 && height > 0) { // render the glyph var memSize = width * height; var mem = memoryBuffer; if (mem == null) { memoryBuffer = mem = new MemoryBuffer(memSize); } mem.Clear(memSize); data.RenderTo(new Surface { Bits = mem.Pointer, Width = width, Height = height, Pitch = width }); // save the rasterized glyph in the user's atlas rect = packer.Insert(width, height); if (rect.Height == 0) { // didn't fit in the atlas... start a new sheet currentPage++; packer.Clear(atlas.Width, atlas.Height); rect = packer.Insert(width, height); if (rect.Height == 0) { throw new InvalidOperationException("Failed to insert glyph into fresh page."); } } atlas.Insert(currentPage, rect.X, rect.Y, rect.Width, rect.Height, mem.Pointer); } glyph = new CachedGlyph(rect, data.HorizontalMetrics.Bearing, data.HorizontalMetrics.Advance); cachedFace.Glyphs.Add(codePoint, glyph); } // check for a kerning offset var kerning = font.GetKerning(previous, codePoint, size); previous = codePoint; // figure out whether this character can serve as a line break point // TODO: more robust character class handling var breakCategory = BreakCategory.None; if (char.IsWhiteSpace(c)) { if (c == '\r' || c == '\n') { breakCategory = BreakCategory.Mandatory; } else { breakCategory = BreakCategory.Opportunity; } } // the previous character might make us think that this one should be a break opportunity if (nextBreak > breakCategory) { breakCategory = nextBreak; } if (c == '-') { nextBreak = BreakCategory.Opportunity; } // alright, we have all the right glyph data cached and loaded // append relevant info to our buffer; we'll do the actual layout later buffer.Add(new BufferEntry { GlyphData = glyph, Kerning = kerning, Break = breakCategory }); } }
public void AppendText(string text, TextFormat format) => AppendText(text, 0, text.Length, format);