Max Katz
3 years ago
committed by
GitHub
GitHub
15 changed files with 419 additions and 445 deletions
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using System; |
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using System.Collections; |
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using System.Collections.Concurrent; |
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using System.Collections.Generic; |
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using System.Diagnostics.CodeAnalysis; |
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using System.Globalization; |
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using Avalonia.Platform; |
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namespace Avalonia.Media.Fonts |
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{ |
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public abstract class FontCollectionBase : IFontCollection |
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{ |
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protected readonly ConcurrentDictionary<string, ConcurrentDictionary<FontCollectionKey, IGlyphTypeface?>> _glyphTypefaceCache = new(); |
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public abstract Uri Key { get; } |
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public abstract int Count { get; } |
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public abstract FontFamily this[int index] { get; } |
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public abstract bool TryGetGlyphTypeface(string familyName, FontStyle style, FontWeight weight, FontStretch stretch, |
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[NotNullWhen(true)] out IGlyphTypeface? glyphTypeface); |
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public bool TryMatchCharacter(int codepoint, FontStyle style, FontWeight weight, FontStretch stretch, |
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string? familyName, CultureInfo? culture, out Typeface match) |
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{ |
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match = default; |
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if (string.IsNullOrEmpty(familyName)) |
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{ |
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foreach (var typefaces in _glyphTypefaceCache.Values) |
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{ |
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if (TryGetNearestMatch(typefaces, new FontCollectionKey { Style = style, Weight = weight, Stretch = stretch }, out var glyphTypeface)) |
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{ |
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if (glyphTypeface.TryGetGlyph((uint)codepoint, out _)) |
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{ |
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match = new Typeface(glyphTypeface.FamilyName, style, weight, stretch); |
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return true; |
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} |
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} |
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} |
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} |
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else |
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{ |
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if (TryGetGlyphTypeface(familyName, style, weight, stretch, out var glyphTypeface)) |
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{ |
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if (glyphTypeface.TryGetGlyph((uint)codepoint, out _)) |
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{ |
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match = new Typeface(familyName, style, weight, stretch); |
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return true; |
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} |
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} |
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} |
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return false; |
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} |
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public abstract void Initialize(IFontManagerImpl fontManager); |
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public abstract IEnumerator<FontFamily> GetEnumerator(); |
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void IDisposable.Dispose() |
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{ |
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foreach (var glyphTypefaces in _glyphTypefaceCache.Values) |
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{ |
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foreach (var pair in glyphTypefaces) |
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{ |
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pair.Value?.Dispose(); |
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} |
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} |
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GC.SuppressFinalize(this); |
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} |
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IEnumerator IEnumerable.GetEnumerator() |
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{ |
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return GetEnumerator(); |
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} |
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internal static bool TryGetNearestMatch( |
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ConcurrentDictionary<FontCollectionKey, |
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IGlyphTypeface?> glyphTypefaces, |
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FontCollectionKey key, |
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[NotNullWhen(true)] out IGlyphTypeface? glyphTypeface) |
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{ |
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if (glyphTypefaces.TryGetValue(key, out glyphTypeface) && glyphTypeface != null) |
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{ |
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return true; |
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} |
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if (key.Style != FontStyle.Normal) |
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{ |
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key = key with { Style = FontStyle.Normal }; |
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} |
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if (key.Stretch != FontStretch.Normal) |
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{ |
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if (TryFindStretchFallback(glyphTypefaces, key, out glyphTypeface)) |
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{ |
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return true; |
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} |
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if (key.Weight != FontWeight.Normal) |
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{ |
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if (TryFindStretchFallback(glyphTypefaces, key with { Weight = FontWeight.Normal }, out glyphTypeface)) |
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{ |
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return true; |
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} |
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} |
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key = key with { Stretch = FontStretch.Normal }; |
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} |
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if (TryFindWeightFallback(glyphTypefaces, key, out glyphTypeface)) |
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{ |
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return true; |
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} |
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if (TryFindStretchFallback(glyphTypefaces, key, out glyphTypeface)) |
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{ |
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return true; |
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} |
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//Take the first glyph typeface we can find.
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foreach (var typeface in glyphTypefaces.Values) |
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{ |
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if(typeface != null) |
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{ |
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glyphTypeface = typeface; |
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return true; |
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} |
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} |
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return false; |
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} |
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internal static bool TryFindStretchFallback( |
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ConcurrentDictionary<FontCollectionKey, |
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IGlyphTypeface?> glyphTypefaces, |
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FontCollectionKey key, |
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[NotNullWhen(true)] out IGlyphTypeface? glyphTypeface) |
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{ |
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glyphTypeface = null; |
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var stretch = (int)key.Stretch; |
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if (stretch < 5) |
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{ |
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for (var i = 0; stretch + i < 9; i++) |
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{ |
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if (glyphTypefaces.TryGetValue(key with { Stretch = (FontStretch)(stretch + i) }, out glyphTypeface) && glyphTypeface != null) |
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{ |
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return true; |
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} |
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} |
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} |
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else |
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{ |
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for (var i = 0; stretch - i > 1; i++) |
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{ |
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if (glyphTypefaces.TryGetValue(key with { Stretch = (FontStretch)(stretch - i) }, out glyphTypeface) && glyphTypeface != null) |
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{ |
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return true; |
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} |
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} |
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} |
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return false; |
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} |
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internal static bool TryFindWeightFallback( |
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ConcurrentDictionary<FontCollectionKey, |
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IGlyphTypeface?> glyphTypefaces, |
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FontCollectionKey key, |
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[NotNullWhen(true)] out IGlyphTypeface? glyphTypeface) |
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{ |
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glyphTypeface = null; |
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var weight = (int)key.Weight; |
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//If the target weight given is between 400 and 500 inclusive
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if (weight >= 400 && weight <= 500) |
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{ |
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//Look for available weights between the target and 500, in ascending order.
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for (var i = 0; weight + i <= 500; i += 50) |
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{ |
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if (glyphTypefaces.TryGetValue(key with { Weight = (FontWeight)(weight + i) }, out glyphTypeface) && glyphTypeface != null) |
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{ |
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return true; |
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} |
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} |
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//If no match is found, look for available weights less than the target, in descending order.
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for (var i = 0; weight - i >= 100; i += 50) |
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{ |
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if (glyphTypefaces.TryGetValue(key with { Weight = (FontWeight)(weight - i) }, out glyphTypeface) && glyphTypeface != null) |
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{ |
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return true; |
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} |
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} |
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//If no match is found, look for available weights greater than 500, in ascending order.
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for (var i = 0; weight + i <= 900; i += 50) |
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{ |
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if (glyphTypefaces.TryGetValue(key with { Weight = (FontWeight)(weight + i) }, out glyphTypeface) && glyphTypeface != null) |
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{ |
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return true; |
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} |
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} |
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} |
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//If a weight less than 400 is given, look for available weights less than the target, in descending order.
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if (weight < 400) |
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{ |
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for (var i = 0; weight - i >= 100; i += 50) |
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{ |
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if (glyphTypefaces.TryGetValue(key with { Weight = (FontWeight)(weight - i) }, out glyphTypeface) && glyphTypeface != null) |
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{ |
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return true; |
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} |
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} |
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//If no match is found, look for available weights less than the target, in descending order.
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for (var i = 0; weight + i <= 900; i += 50) |
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{ |
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if (glyphTypefaces.TryGetValue(key with { Weight = (FontWeight)(weight + i) }, out glyphTypeface) && glyphTypeface != null) |
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{ |
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return true; |
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} |
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} |
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} |
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//If a weight greater than 500 is given, look for available weights greater than the target, in ascending order.
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if (weight > 500) |
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{ |
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for (var i = 0; weight + i <= 900; i += 50) |
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{ |
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if (glyphTypefaces.TryGetValue(key with { Weight = (FontWeight)(weight + i) }, out glyphTypeface) && glyphTypeface != null) |
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{ |
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return true; |
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} |
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} |
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//If no match is found, look for available weights less than the target, in descending order.
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for (var i = 0; weight - i >= 100; i += 50) |
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{ |
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if (glyphTypefaces.TryGetValue(key with { Weight = (FontWeight)(weight - i) }, out glyphTypeface) && glyphTypeface != null) |
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{ |
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return true; |
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} |
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} |
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} |
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return false; |
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} |
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} |
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} |
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