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@ -2,6 +2,7 @@ |
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using System.Buffers; |
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using System.Collections; |
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using System.Collections.Generic; |
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using System.Runtime.CompilerServices; |
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using Avalonia.Utilities; |
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namespace Avalonia.Media.TextFormatting |
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@ -9,12 +10,13 @@ namespace Avalonia.Media.TextFormatting |
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public sealed class ShapedBuffer : IReadOnlyList<GlyphInfo>, IDisposable |
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{ |
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private GlyphInfo[]? _rentedBuffer; |
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private ArraySlice<GlyphInfo> _glyphInfos; |
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public ShapedBuffer(ReadOnlyMemory<char> text, int bufferLength, IGlyphTypeface glyphTypeface, double fontRenderingEmSize, sbyte bidiLevel) |
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{ |
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_rentedBuffer = ArrayPool<GlyphInfo>.Shared.Rent(bufferLength); |
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Text = text; |
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GlyphInfos = new ArraySlice<GlyphInfo>(_rentedBuffer, 0, bufferLength); |
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_rentedBuffer = ArrayPool<GlyphInfo>.Shared.Rent(bufferLength); |
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_glyphInfos = new ArraySlice<GlyphInfo>(_rentedBuffer, 0, bufferLength); |
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GlyphTypeface = glyphTypeface; |
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FontRenderingEmSize = fontRenderingEmSize; |
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BidiLevel = bidiLevel; |
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@ -23,27 +25,70 @@ namespace Avalonia.Media.TextFormatting |
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internal ShapedBuffer(ReadOnlyMemory<char> text, ArraySlice<GlyphInfo> glyphInfos, IGlyphTypeface glyphTypeface, double fontRenderingEmSize, sbyte bidiLevel) |
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{ |
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Text = text; |
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GlyphInfos = glyphInfos; |
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_glyphInfos = glyphInfos; |
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GlyphTypeface = glyphTypeface; |
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FontRenderingEmSize = fontRenderingEmSize; |
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BidiLevel = bidiLevel; |
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} |
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internal ArraySlice<GlyphInfo> GlyphInfos { get; private set; } |
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public int Length |
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=> GlyphInfos.Length; |
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/// <summary>
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/// The buffer's length.
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/// </summary>
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public int Length => _glyphInfos.Length; |
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/// <summary>
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/// The buffer's glyph typeface.
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/// </summary>
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public IGlyphTypeface GlyphTypeface { get; } |
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/// <summary>
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/// The buffers font rendering em size.
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/// </summary>
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public double FontRenderingEmSize { get; } |
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/// <summary>
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/// The buffer's bidi level.
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/// </summary>
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public sbyte BidiLevel { get; } |
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/// <summary>
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/// The buffer's reading direction.
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/// </summary>
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public bool IsLeftToRight => (BidiLevel & 1) == 0; |
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/// <summary>
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/// The text that is represended by this buffer.
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/// </summary>
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public ReadOnlyMemory<char> Text { get; } |
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/// <summary>
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/// Reverses the buffer.
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/// </summary>
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public void Reverse() |
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{ |
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_glyphInfos.Span.Reverse(); |
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} |
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public void Dispose() |
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{ |
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if (_rentedBuffer is not null) |
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{ |
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ArrayPool<GlyphInfo>.Shared.Return(_rentedBuffer); |
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_rentedBuffer = null; |
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_glyphInfos = ArraySlice<GlyphInfo>.Empty; // ensure we don't misuse the returned array
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} |
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} |
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public GlyphInfo this[int index] |
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{ |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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get => _glyphInfos[index]; |
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[MethodImpl(MethodImplOptions.AggressiveInlining)] |
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set => _glyphInfos[index] = value; |
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} |
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public IEnumerator<GlyphInfo> GetEnumerator() => _glyphInfos.GetEnumerator(); |
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/// <summary>
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/// Finds a glyph index for given character index.
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/// </summary>
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@ -53,20 +98,19 @@ namespace Avalonia.Media.TextFormatting |
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/// </returns>
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private int FindGlyphIndex(int characterIndex) |
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{ |
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if (characterIndex < GlyphInfos[0].GlyphCluster) |
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if (characterIndex < _glyphInfos[0].GlyphCluster) |
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{ |
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return 0; |
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} |
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if (characterIndex > GlyphInfos[GlyphInfos.Length - 1].GlyphCluster) |
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if (characterIndex > _glyphInfos[_glyphInfos.Length - 1].GlyphCluster) |
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{ |
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return GlyphInfos.Length - 1; |
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return _glyphInfos.Length - 1; |
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} |
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var comparer = GlyphInfo.ClusterAscendingComparer; |
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var glyphInfos = GlyphInfos.Span; |
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var glyphInfos = _glyphInfos.Span; |
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var searchValue = new GlyphInfo(default, characterIndex, default); |
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@ -109,42 +153,24 @@ namespace Avalonia.Media.TextFormatting |
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return new SplitResult<ShapedBuffer>(this, null); |
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} |
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var firstCluster = GlyphInfos[0].GlyphCluster; |
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var lastCluster = GlyphInfos[GlyphInfos.Length - 1].GlyphCluster; |
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var firstCluster = _glyphInfos[0].GlyphCluster; |
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var lastCluster = _glyphInfos[_glyphInfos.Length - 1].GlyphCluster; |
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var start = firstCluster < lastCluster ? firstCluster : lastCluster; |
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var glyphCount = FindGlyphIndex(start + length); |
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var first = new ShapedBuffer(Text.Slice(0, length), |
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GlyphInfos.Take(glyphCount), GlyphTypeface, FontRenderingEmSize, BidiLevel); |
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_glyphInfos.Take(glyphCount), GlyphTypeface, FontRenderingEmSize, BidiLevel); |
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var second = new ShapedBuffer(Text.Slice(length), |
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GlyphInfos.Skip(glyphCount), GlyphTypeface, FontRenderingEmSize, BidiLevel); |
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_glyphInfos.Skip(glyphCount), GlyphTypeface, FontRenderingEmSize, BidiLevel); |
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return new SplitResult<ShapedBuffer>(first, second); |
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} |
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int IReadOnlyCollection<GlyphInfo>.Count => GlyphInfos.Length; |
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public GlyphInfo this[int index] |
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{ |
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get => GlyphInfos[index]; |
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set => GlyphInfos[index] = value; |
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} |
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public IEnumerator<GlyphInfo> GetEnumerator() => GlyphInfos.GetEnumerator(); |
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int IReadOnlyCollection<GlyphInfo>.Count => _glyphInfos.Length; |
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IEnumerator IEnumerable.GetEnumerator() => GetEnumerator(); |
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public void Dispose() |
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{ |
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if (_rentedBuffer is not null) |
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{ |
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ArrayPool<GlyphInfo>.Shared.Return(_rentedBuffer); |
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_rentedBuffer = null; |
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GlyphInfos = ArraySlice<GlyphInfo>.Empty; // ensure we don't misuse the returned array
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} |
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} |
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IEnumerator IEnumerable.GetEnumerator() => GetEnumerator(); |
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} |
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} |
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Benedikt Stebner
3 years ago