Emmanuel Hansen
4 years ago
committed by
GitHub
GitHub
59 changed files with 737 additions and 770 deletions
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namespace Avalonia.Media |
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{ |
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/// <summary>
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/// The font metrics is holding information about a font's ascent, descent, etc. in design em units.
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/// </summary>
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public readonly struct FontMetrics |
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{ |
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/// <summary>
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/// Gets the font design units per em.
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/// </summary>
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public short DesignEmHeight { get; init; } |
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/// <summary>
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/// A <see cref="bool"/> value indicating whether all glyphs in the font have the same advancement.
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/// </summary>
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public bool IsFixedPitch { get; init; } |
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/// <summary>
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/// Gets the recommended distance above the baseline in design em size.
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/// </summary>
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public int Ascent { get; init; } |
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/// <summary>
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/// Gets the recommended distance under the baseline in design em size.
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/// </summary>
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public int Descent { get; init; } |
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/// <summary>
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/// Gets the recommended additional space between two lines of text in design em size.
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/// </summary>
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public int LineGap { get; init; } |
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/// <summary>
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/// Gets the recommended line spacing of a formed text line.
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/// </summary>
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public int LineSpacing => Descent - Ascent + LineGap; |
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/// <summary>
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/// Gets a value that indicates the distance of the underline from the baseline in design em size.
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/// </summary>
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public int UnderlinePosition { get; init; } |
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/// <summary>
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/// Gets a value that indicates the thickness of the underline in design em size.
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/// </summary>
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public int UnderlineThickness { get; init; } |
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/// <summary>
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/// Gets a value that indicates the distance of the strikethrough from the baseline in design em size.
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/// </summary>
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public int StrikethroughPosition { get; init; } |
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/// <summary>
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/// Gets a value that indicates the thickness of the underline in design em size.
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/// </summary>
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public int StrikethroughThickness { get; init; } |
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} |
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} |
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@ -1,125 +0,0 @@ |
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using System; |
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using Avalonia.Platform; |
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namespace Avalonia.Media |
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{ |
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public sealed class GlyphTypeface : IDisposable |
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{ |
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public GlyphTypeface(Typeface typeface) |
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: this(FontManager.Current.PlatformImpl.CreateGlyphTypeface(typeface)) |
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{ |
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} |
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public GlyphTypeface(IGlyphTypefaceImpl platformImpl) |
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{ |
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PlatformImpl = platformImpl; |
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} |
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public IGlyphTypefaceImpl PlatformImpl { get; } |
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/// <summary>
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/// Gets the font design units per em.
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/// </summary>
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public short DesignEmHeight => PlatformImpl.DesignEmHeight; |
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/// <summary>
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/// Gets the recommended distance above the baseline in design em size.
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/// </summary>
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public int Ascent => PlatformImpl.Ascent; |
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/// <summary>
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/// Gets the recommended distance under the baseline in design em size.
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/// </summary>
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public int Descent => PlatformImpl.Descent; |
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/// <summary>
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/// Gets the recommended additional space between two lines of text in design em size.
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/// </summary>
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public int LineGap => PlatformImpl.LineGap; |
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/// <summary>
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/// Gets the recommended line height.
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/// </summary>
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public int LineHeight => Descent - Ascent + LineGap; |
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/// <summary>
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/// Gets a value that indicates the distance of the underline from the baseline in design em size.
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/// </summary>
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public int UnderlinePosition => PlatformImpl.UnderlinePosition; |
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/// <summary>
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/// Gets a value that indicates the thickness of the underline in design em size.
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/// </summary>
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public int UnderlineThickness => PlatformImpl.UnderlineThickness; |
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/// <summary>
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/// Gets a value that indicates the distance of the strikethrough from the baseline in design em size.
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/// </summary>
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public int StrikethroughPosition => PlatformImpl.StrikethroughPosition; |
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/// <summary>
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/// Gets a value that indicates the thickness of the underline in design em size.
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/// </summary>
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public int StrikethroughThickness => PlatformImpl.StrikethroughThickness; |
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/// <summary>
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/// A <see cref="bool"/> value indicating whether all glyphs in the font have the same advancement.
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/// </summary>
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public bool IsFixedPitch => PlatformImpl.IsFixedPitch; |
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/// <summary>
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/// Returns an glyph index for the specified codepoint.
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/// </summary>
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/// <remarks>
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/// Returns a replacement glyph if a glyph isn't found.
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/// </remarks>
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/// <param name="codepoint">The codepoint.</param>
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/// <returns>
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/// A glyph index.
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/// </returns>
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public ushort GetGlyph(uint codepoint) => PlatformImpl.GetGlyph(codepoint); |
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/// <summary>
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/// Tries to get an glyph index for specified codepoint.
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/// </summary>
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/// <param name="codepoint">The codepoint.</param>
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/// <param name="glyph">A glyph index.</param>
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/// <returns>
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/// <c>true</c> if an glyph index was found, <c>false</c> otherwise.
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/// </returns>
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public bool TryGetGlyph(uint codepoint, out ushort glyph) |
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{ |
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glyph = PlatformImpl.GetGlyph(codepoint); |
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return glyph != 0; |
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} |
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/// <summary>
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/// Returns an array of glyph indices. Codepoints that are not represented by the font are returned as <code>0</code>.
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/// </summary>
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/// <param name="codepoints">The codepoints to map.</param>
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/// <returns></returns>
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public ushort[] GetGlyphs(ReadOnlySpan<uint> codepoints) => PlatformImpl.GetGlyphs(codepoints); |
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/// <summary>
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/// Returns the glyph advance for the specified glyph.
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/// </summary>
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/// <param name="glyph">The glyph.</param>
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/// <returns>
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/// The advance.
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/// </returns>
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public int GetGlyphAdvance(ushort glyph) => PlatformImpl.GetGlyphAdvance(glyph); |
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/// <summary>
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/// Returns an array of glyph advances in design em size.
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/// </summary>
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/// <param name="glyphs">The glyph indices.</param>
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/// <returns></returns>
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public int[] GetGlyphAdvances(ReadOnlySpan<ushort> glyphs) => PlatformImpl.GetGlyphAdvances(glyphs); |
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void IDisposable.Dispose() |
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{ |
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PlatformImpl?.Dispose(); |
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} |
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} |
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} |
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@ -1,33 +1,33 @@ |
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namespace Avalonia.Media.TextFormatting |
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{ |
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/// <summary>
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/// A metric that holds information about font specific measurements.
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/// A metric that holds information about text specific measurements.
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/// </summary>
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public readonly struct FontMetrics |
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public readonly struct TextMetrics |
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{ |
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public FontMetrics(Typeface typeface, double fontRenderingEmSize) |
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public TextMetrics(Typeface typeface, double fontRenderingEmSize) |
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{ |
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var glyphTypeface = typeface.GlyphTypeface; |
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var fontMetrics = typeface.GlyphTypeface.Metrics; |
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var scale = fontRenderingEmSize / glyphTypeface.DesignEmHeight; |
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var scale = fontRenderingEmSize / fontMetrics.DesignEmHeight; |
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FontRenderingEmSize = fontRenderingEmSize; |
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Ascent = glyphTypeface.Ascent * scale; |
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Ascent = fontMetrics.Ascent * scale; |
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Descent = glyphTypeface.Descent * scale; |
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Descent = fontMetrics.Descent * scale; |
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LineGap = glyphTypeface.LineGap * scale; |
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LineGap = fontMetrics.LineGap * scale; |
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LineHeight = Descent - Ascent + LineGap; |
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UnderlineThickness = glyphTypeface.UnderlineThickness * scale; |
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UnderlineThickness = fontMetrics.UnderlineThickness * scale; |
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UnderlinePosition = glyphTypeface.UnderlinePosition * scale; |
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UnderlinePosition = fontMetrics.UnderlinePosition * scale; |
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StrikethroughThickness = glyphTypeface.StrikethroughThickness * scale; |
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StrikethroughThickness = fontMetrics.StrikethroughThickness * scale; |
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StrikethroughPosition = glyphTypeface.StrikethroughPosition * scale; |
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StrikethroughPosition = fontMetrics.StrikethroughPosition * scale; |
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} |
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/// <summary>
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@ -0,0 +1,22 @@ |
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using System; |
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using System.Drawing; |
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namespace Avalonia.Platform |
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{ |
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public interface IGlyphRunBuffer |
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{ |
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Span<ushort> GlyphIndices { get; } |
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IGlyphRunImpl Build(); |
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} |
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public interface IHorizontalGlyphRunBuffer : IGlyphRunBuffer |
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{ |
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Span<float> GlyphPositions { get; } |
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} |
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public interface IPositionedGlyphRunBuffer : IGlyphRunBuffer |
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{ |
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Span<PointF> GlyphPositions { get; } |
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} |
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} |
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