Max Katz
4 years ago
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GitHub
16 changed files with 540 additions and 43 deletions
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using System; |
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using System.Collections.Generic; |
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using System.Globalization; |
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using System.Linq; |
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using Avalonia.Media; |
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using Avalonia.Media.Fonts; |
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using Avalonia.Platform; |
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namespace Avalonia.UnitTests |
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{ |
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public class HarfBuzzFontManagerImpl : IFontManagerImpl |
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{ |
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private readonly Typeface[] _customTypefaces; |
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private readonly string _defaultFamilyName; |
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private static readonly Typeface _defaultTypeface = |
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new Typeface("resm:Avalonia.UnitTests.Assets?assembly=Avalonia.UnitTests#Noto Mono"); |
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private static readonly Typeface _italicTypeface = |
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new Typeface("resm:Avalonia.UnitTests.Assets?assembly=Avalonia.UnitTests#Noto Sans"); |
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private static readonly Typeface _emojiTypeface = |
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new Typeface("resm:Avalonia.UnitTests.Assets?assembly=Avalonia.UnitTests#Twitter Color Emoji"); |
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public HarfBuzzFontManagerImpl(string defaultFamilyName = "resm:Avalonia.UnitTests.Assets?assembly=Avalonia.UnitTests#Noto Mono") |
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{ |
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_customTypefaces = new[] { _emojiTypeface, _italicTypeface, _defaultTypeface }; |
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_defaultFamilyName = defaultFamilyName; |
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} |
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public string GetDefaultFontFamilyName() |
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{ |
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return _defaultFamilyName; |
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} |
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public IEnumerable<string> GetInstalledFontFamilyNames(bool checkForUpdates = false) |
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{ |
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return _customTypefaces.Select(x => x.FontFamily!.Name); |
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} |
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public bool TryMatchCharacter(int codepoint, FontStyle fontStyle, FontWeight fontWeight, FontFamily fontFamily, |
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CultureInfo culture, out Typeface fontKey) |
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{ |
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foreach (var customTypeface in _customTypefaces) |
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{ |
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var glyphTypeface = customTypeface.GlyphTypeface; |
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if (!glyphTypeface.TryGetGlyph((uint)codepoint, out _)) |
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{ |
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continue; |
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} |
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fontKey = customTypeface; |
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return true; |
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} |
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fontKey = default; |
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return false; |
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} |
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public IGlyphTypefaceImpl CreateGlyphTypeface(Typeface typeface) |
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{ |
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var fontFamily = typeface.FontFamily; |
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if (fontFamily == null) |
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{ |
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return null; |
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} |
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if (fontFamily.IsDefault) |
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{ |
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fontFamily = _defaultTypeface.FontFamily; |
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} |
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if (fontFamily!.Key == null) |
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{ |
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return null; |
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} |
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var fontAssets = FontFamilyLoader.LoadFontAssets(fontFamily.Key); |
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var asset = fontAssets.First(); |
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var assetLoader = AvaloniaLocator.Current.GetService<IAssetLoader>(); |
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if (assetLoader == null) |
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{ |
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throw new NotSupportedException("IAssetLoader is not registered."); |
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} |
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var stream = assetLoader.Open(asset); |
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return new HarfBuzzGlyphTypefaceImpl(stream); |
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} |
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} |
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} |
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using System; |
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using System.IO; |
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using Avalonia.Platform; |
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using HarfBuzzSharp; |
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namespace Avalonia.UnitTests |
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{ |
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public class HarfBuzzGlyphTypefaceImpl : IGlyphTypefaceImpl |
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{ |
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private bool _isDisposed; |
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private Blob _blob; |
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public HarfBuzzGlyphTypefaceImpl(Stream data, bool isFakeBold = false, bool isFakeItalic = false) |
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{ |
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_blob = Blob.FromStream(data); |
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Face = new Face(_blob, 0); |
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Font = new Font(Face); |
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Font.SetFunctionsOpenType(); |
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Font.GetScale(out var scale, out _); |
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DesignEmHeight = (short)scale; |
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var metrics = Font.OpenTypeMetrics; |
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const double defaultFontRenderingEmSize = 12.0; |
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Ascent = (int)(metrics.GetXVariation(OpenTypeMetricsTag.HorizontalAscender) / defaultFontRenderingEmSize * DesignEmHeight); |
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Descent = (int)(metrics.GetXVariation(OpenTypeMetricsTag.HorizontalDescender) / defaultFontRenderingEmSize * DesignEmHeight); |
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LineGap = (int)(metrics.GetXVariation(OpenTypeMetricsTag.HorizontalLineGap) / defaultFontRenderingEmSize * DesignEmHeight); |
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UnderlinePosition = (int)(metrics.GetXVariation(OpenTypeMetricsTag.UnderlineOffset) / defaultFontRenderingEmSize * DesignEmHeight); |
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UnderlineThickness = (int)(metrics.GetXVariation(OpenTypeMetricsTag.UnderlineSize) / defaultFontRenderingEmSize * DesignEmHeight); |
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StrikethroughPosition = (int)(metrics.GetXVariation(OpenTypeMetricsTag.StrikeoutOffset) / defaultFontRenderingEmSize * DesignEmHeight); |
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StrikethroughThickness = (int)(metrics.GetXVariation(OpenTypeMetricsTag.StrikeoutSize) / defaultFontRenderingEmSize * DesignEmHeight); |
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IsFixedPitch = GetGlyphAdvance(GetGlyph('a')) == GetGlyphAdvance(GetGlyph('b')); |
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IsFakeBold = isFakeBold; |
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IsFakeItalic = isFakeItalic; |
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} |
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public Face Face { get; } |
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public Font Font { get; } |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public short DesignEmHeight { get; } |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public int Ascent { get; } |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public int Descent { get; } |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public int LineGap { get; } |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public int UnderlinePosition { get; } |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public int UnderlineThickness { get; } |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public int StrikethroughPosition { get; } |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public int StrikethroughThickness { get; } |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public bool IsFixedPitch { get; } |
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public bool IsFakeBold { get; } |
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public bool IsFakeItalic { get; } |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public ushort GetGlyph(uint codepoint) |
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{ |
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if (Font.TryGetGlyph(codepoint, out var glyph)) |
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{ |
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return (ushort)glyph; |
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} |
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return 0; |
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} |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public ushort[] GetGlyphs(ReadOnlySpan<uint> codepoints) |
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{ |
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var glyphs = new ushort[codepoints.Length]; |
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for (var i = 0; i < codepoints.Length; i++) |
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{ |
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if (Font.TryGetGlyph(codepoints[i], out var glyph)) |
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{ |
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glyphs[i] = (ushort)glyph; |
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} |
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} |
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return glyphs; |
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} |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public int GetGlyphAdvance(ushort glyph) |
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{ |
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return Font.GetHorizontalGlyphAdvance(glyph); |
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} |
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/// <inheritdoc cref="IGlyphTypefaceImpl"/>
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public int[] GetGlyphAdvances(ReadOnlySpan<ushort> glyphs) |
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{ |
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var glyphIndices = new uint[glyphs.Length]; |
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for (var i = 0; i < glyphs.Length; i++) |
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{ |
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glyphIndices[i] = glyphs[i]; |
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} |
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return Font.GetHorizontalGlyphAdvances(glyphIndices); |
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} |
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private void Dispose(bool disposing) |
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{ |
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if (_isDisposed) |
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{ |
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return; |
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} |
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_isDisposed = true; |
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if (!disposing) |
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{ |
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return; |
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} |
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Font?.Dispose(); |
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Face?.Dispose(); |
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_blob?.Dispose(); |
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} |
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public void Dispose() |
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{ |
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Dispose(true); |
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GC.SuppressFinalize(this); |
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} |
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} |
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} |
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@ -0,0 +1,147 @@ |
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using System; |
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using System.Globalization; |
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using Avalonia.Media; |
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using Avalonia.Media.TextFormatting.Unicode; |
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using Avalonia.Platform; |
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using Avalonia.Utilities; |
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using HarfBuzzSharp; |
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using Buffer = HarfBuzzSharp.Buffer; |
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namespace Avalonia.UnitTests |
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{ |
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public class HarfBuzzTextShaperImpl : ITextShaperImpl |
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{ |
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public GlyphRun ShapeText(ReadOnlySlice<char> text, Typeface typeface, double fontRenderingEmSize, |
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CultureInfo culture) |
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{ |
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using (var buffer = new Buffer()) |
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{ |
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FillBuffer(buffer, text); |
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buffer.Language = new Language(culture ?? CultureInfo.CurrentCulture); |
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buffer.GuessSegmentProperties(); |
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var glyphTypeface = typeface.GlyphTypeface; |
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var font = ((HarfBuzzGlyphTypefaceImpl)glyphTypeface.PlatformImpl).Font; |
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font.Shape(buffer); |
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font.GetScale(out var scaleX, out _); |
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var textScale = fontRenderingEmSize / scaleX; |
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var bufferLength = buffer.Length; |
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var glyphInfos = buffer.GetGlyphInfoSpan(); |
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var glyphPositions = buffer.GetGlyphPositionSpan(); |
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var glyphIndices = new ushort[bufferLength]; |
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var clusters = new ushort[bufferLength]; |
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double[] glyphAdvances = null; |
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Vector[] glyphOffsets = null; |
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for (var i = 0; i < bufferLength; i++) |
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{ |
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glyphIndices[i] = (ushort)glyphInfos[i].Codepoint; |
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clusters[i] = (ushort)glyphInfos[i].Cluster; |
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if (!glyphTypeface.IsFixedPitch) |
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{ |
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SetAdvance(glyphPositions, i, textScale, ref glyphAdvances); |
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} |
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SetOffset(glyphPositions, i, textScale, ref glyphOffsets); |
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} |
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return new GlyphRun(glyphTypeface, fontRenderingEmSize, |
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new ReadOnlySlice<ushort>(glyphIndices), |
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new ReadOnlySlice<double>(glyphAdvances), |
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new ReadOnlySlice<Vector>(glyphOffsets), |
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text, |
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new ReadOnlySlice<ushort>(clusters), |
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buffer.Direction == Direction.LeftToRight ? 0 : 1); |
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} |
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} |
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private static void FillBuffer(Buffer buffer, ReadOnlySlice<char> text) |
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{ |
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buffer.ContentType = ContentType.Unicode; |
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var i = 0; |
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while (i < text.Length) |
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{ |
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var codepoint = Codepoint.ReadAt(text, i, out var count); |
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var cluster = (uint)(text.Start + i); |
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if (codepoint.IsBreakChar) |
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{ |
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if (i + 1 < text.Length) |
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{ |
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var nextCodepoint = Codepoint.ReadAt(text, i + 1, out _); |
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if (nextCodepoint == '\n' && codepoint == '\r') |
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{ |
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count++; |
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buffer.Add('\u200C', cluster); |
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buffer.Add('\u200D', cluster); |
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} |
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else |
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{ |
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buffer.Add('\u200C', cluster); |
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} |
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} |
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else |
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{ |
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buffer.Add('\u200C', cluster); |
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} |
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} |
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else |
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{ |
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buffer.Add(codepoint, cluster); |
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} |
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i += count; |
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} |
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} |
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private static void SetOffset(ReadOnlySpan<GlyphPosition> glyphPositions, int index, double textScale, |
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ref Vector[] offsetBuffer) |
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{ |
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var position = glyphPositions[index]; |
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if (position.XOffset == 0 && position.YOffset == 0) |
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{ |
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return; |
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} |
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offsetBuffer ??= new Vector[glyphPositions.Length]; |
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var offsetX = position.XOffset * textScale; |
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var offsetY = position.YOffset * textScale; |
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offsetBuffer[index] = new Vector(offsetX, offsetY); |
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} |
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private static void SetAdvance(ReadOnlySpan<GlyphPosition> glyphPositions, int index, double textScale, |
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ref double[] advanceBuffer) |
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{ |
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advanceBuffer ??= new double[glyphPositions.Length]; |
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// Depends on direction of layout
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// advanceBuffer[index] = buffer.GlyphPositions[index].YAdvance * textScale;
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advanceBuffer[index] = glyphPositions[index].XAdvance * textScale; |
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} |
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} |
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} |
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