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Reuse the shaped text runs as much as possible

pull/4437/head
Benedikt Schroeder 6 years ago
parent
c4e9373a54
commit
4f7a701ab7
4 changed files with 62 additions and 36 deletions
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  1. 79
      src/Avalonia.Visuals/Media/TextFormatting/TextFormatterImpl.cs
  2. 5
      src/Avalonia.Visuals/Media/TextFormatting/TextLayout.cs
  3. 4
      src/Avalonia.Visuals/Media/TextFormatting/TextLineImpl.cs
  4. 10
      src/Skia/Avalonia.Skia/TextShaperImpl.cs

79
src/Avalonia.Visuals/Media/TextFormatting/TextFormatterImpl.cs
View File

@ -31,7 +31,8 @@ namespace Avalonia.Media.TextFormatting
case TextWrapping.WrapWithOverflow:
case TextWrapping.Wrap:
{
textLine = PerformTextWrapping(textRuns, textRange, paragraphWidth, paragraphProperties);
textLine = PerformTextWrapping(textRuns, textRange, paragraphWidth, paragraphProperties,
nextLineBreak);
break;
}
default:
@ -118,7 +119,7 @@ namespace Avalonia.Media.TextFormatting
/// <param name="textRuns">The text run's.</param>
/// <param name="length">The length to split at.</param>
/// <returns>The split text runs.</returns>
internal static SplitTextRunsResult SplitTextRuns(IReadOnlyList<ShapedTextCharacters> textRuns, int length)
internal static SplitTextRunsResult SplitTextRuns(List<ShapedTextCharacters> textRuns, int length)
{
var currentLength = 0;
@ -134,13 +135,13 @@ namespace Avalonia.Media.TextFormatting
var firstCount = currentRun.GlyphRun.Characters.Length >= 1 ? i + 1 : i;
var first = new ShapedTextCharacters[firstCount];
var first = new List<ShapedTextCharacters>(firstCount);
if (firstCount > 1)
{
for (var j = 0; j < i; j++)
{
first[j] = textRuns[j];
first.Add(textRuns[j]);
}
}
@ -148,7 +149,7 @@ namespace Avalonia.Media.TextFormatting
if (currentLength + currentRun.GlyphRun.Characters.Length == length)
{
var second = new ShapedTextCharacters[secondCount];
var second = new List<ShapedTextCharacters>(secondCount);
var offset = currentRun.GlyphRun.Characters.Length > 1 ? 1 : 0;
@ -156,11 +157,11 @@ namespace Avalonia.Media.TextFormatting
{
for (var j = 0; j < secondCount; j++)
{
second[j] = textRuns[i + j + offset];
second.Add(textRuns[i + j + offset]);
}
}
first[i] = currentRun;
first.Add(currentRun);
return new SplitTextRunsResult(first, second);
}
@ -168,22 +169,22 @@ namespace Avalonia.Media.TextFormatting
{
secondCount++;
var second = new ShapedTextCharacters[secondCount];
var second = new List<ShapedTextCharacters>(secondCount);
var split = currentRun.Split(length - currentLength);
first.Add(split.First);
second.Add(split.Second);
if (secondCount > 0)
{
for (var j = 1; j < secondCount; j++)
{
second[j] = textRuns[i + j];
second.Add(textRuns[i + j]);
}
}
var split = currentRun.Split(length - currentLength);
first[i] = split.First;
second[0] = split.Second;
return new SplitTextRunsResult(first, second);
}
}
@ -201,7 +202,7 @@ namespace Avalonia.Media.TextFormatting
/// <returns>
/// The formatted text runs.
/// </returns>
private static IReadOnlyList<ShapedTextCharacters> FetchTextRuns(ITextSource textSource,
private static List<ShapedTextCharacters> FetchTextRuns(ITextSource textSource,
int firstTextSourceIndex, TextLineBreak previousLineBreak, out TextLineBreak nextLineBreak)
{
nextLineBreak = default;
@ -212,8 +213,10 @@ namespace Avalonia.Media.TextFormatting
if (previousLineBreak != null)
{
foreach (var shapedCharacters in previousLineBreak.RemainingCharacters)
for (var index = 0; index < previousLineBreak.RemainingCharacters.Count; index++)
{
var shapedCharacters = previousLineBreak.RemainingCharacters[index];
if (shapedCharacters == null)
{
continue;
@ -225,6 +228,14 @@ namespace Avalonia.Media.TextFormatting
{
var splitResult = SplitTextRuns(textRuns, currentLength + runLineBreak.PositionWrap);
if (++index < previousLineBreak.RemainingCharacters.Count)
{
for (; index < previousLineBreak.RemainingCharacters.Count; index++)
{
splitResult.Second.Add(previousLineBreak.RemainingCharacters[index]);
}
}
nextLineBreak = new TextLineBreak(splitResult.Second);
return splitResult.First;
@ -323,9 +334,10 @@ namespace Avalonia.Media.TextFormatting
/// <param name="textRange">The text range that is covered by the text runs.</param>
/// <param name="paragraphWidth">The paragraph width.</param>
/// <param name="paragraphProperties">The text paragraph properties.</param>
/// <param name="currentLineBreak">The current line break if the line was explicitly broken.</param>
/// <returns>The wrapped text line.</returns>
private static TextLine PerformTextWrapping(IReadOnlyList<ShapedTextCharacters> textRuns, TextRange textRange,
double paragraphWidth, TextParagraphProperties paragraphProperties)
private static TextLine PerformTextWrapping(List<ShapedTextCharacters> textRuns, TextRange textRange,
double paragraphWidth, TextParagraphProperties paragraphProperties, TextLineBreak currentLineBreak)
{
var availableWidth = paragraphWidth;
var currentWidth = 0.0;
@ -388,8 +400,22 @@ namespace Avalonia.Media.TextFormatting
var textLineMetrics = TextLineMetrics.Create(splitResult.First,
new TextRange(textRange.Start, currentLength), paragraphWidth, paragraphProperties);
var lineBreak = splitResult.Second != null && splitResult.Second.Count > 0 ?
new TextLineBreak(splitResult.Second) :
var remainingCharacters = splitResult.Second;
if (currentLineBreak?.RemainingCharacters != null)
{
if (remainingCharacters != null)
{
remainingCharacters.AddRange(currentLineBreak.RemainingCharacters);
}
else
{
remainingCharacters = new List<ShapedTextCharacters>(currentLineBreak.RemainingCharacters);
}
}
var lineBreak = remainingCharacters != null && remainingCharacters.Count > 0 ?
new TextLineBreak(remainingCharacters) :
null;
return new TextLineImpl(splitResult.First, textLineMetrics, lineBreak);
@ -403,7 +429,10 @@ namespace Avalonia.Media.TextFormatting
}
return new TextLineImpl(textRuns,
TextLineMetrics.Create(textRuns, textRange, paragraphWidth, paragraphProperties));
TextLineMetrics.Create(textRuns, textRange, paragraphWidth, paragraphProperties),
currentLineBreak?.RemainingCharacters != null ?
new TextLineBreak(currentLineBreak.RemainingCharacters) :
null);
}
/// <summary>
@ -434,7 +463,7 @@ namespace Avalonia.Media.TextFormatting
internal readonly struct SplitTextRunsResult
{
public SplitTextRunsResult(IReadOnlyList<ShapedTextCharacters> first, IReadOnlyList<ShapedTextCharacters> second)
public SplitTextRunsResult(List<ShapedTextCharacters> first, List<ShapedTextCharacters> second)
{
First = first;
@ -447,7 +476,7 @@ namespace Avalonia.Media.TextFormatting
/// <value>
/// The first text runs.
/// </value>
public IReadOnlyList<ShapedTextCharacters> First { get; }
public List<ShapedTextCharacters> First { get; }
/// <summary>
/// Gets the second text runs.
@ -455,7 +484,7 @@ namespace Avalonia.Media.TextFormatting
/// <value>
/// The second text runs.
/// </value>
public IReadOnlyList<ShapedTextCharacters> Second { get; }
public List<ShapedTextCharacters> Second { get; }
}
private struct TextRunEnumerator

5
src/Avalonia.Visuals/Media/TextFormatting/TextLayout.cs
View File

@ -183,7 +183,10 @@ namespace Avalonia.Media.TextFormatting
var glyphRun = TextShaper.Current.ShapeText(new ReadOnlySlice<char>(s_empty, startingIndex, 1),
properties.Typeface, properties.FontRenderingEmSize, properties.CultureInfo);
var textRuns = new[] { new ShapedTextCharacters(glyphRun, _paragraphProperties.DefaultTextRunProperties) };
var textRuns = new List<ShapedTextCharacters>
{
new ShapedTextCharacters(glyphRun, _paragraphProperties.DefaultTextRunProperties)
};
return new TextLineImpl(textRuns,
TextLineMetrics.Create(textRuns, new TextRange(startingIndex, 1), MaxWidth, _paragraphProperties));

4
src/Avalonia.Visuals/Media/TextFormatting/TextLineImpl.cs
View File

@ -6,9 +6,9 @@ namespace Avalonia.Media.TextFormatting
{
internal class TextLineImpl : TextLine
{
private readonly IReadOnlyList<ShapedTextCharacters> _textRuns;
private readonly List<ShapedTextCharacters> _textRuns;
public TextLineImpl(IReadOnlyList<ShapedTextCharacters> textRuns, TextLineMetrics lineMetrics,
public TextLineImpl(List<ShapedTextCharacters> textRuns, TextLineMetrics lineMetrics,
TextLineBreak lineBreak = null, bool hasCollapsed = false)
{
_textRuns = textRuns;

10
src/Skia/Avalonia.Skia/TextShaperImpl.cs
View File

@ -123,10 +123,7 @@ namespace Avalonia.Skia
return;
}
if (offsetBuffer == null)
{
offsetBuffer = new Vector[glyphPositions.Length];
}
offsetBuffer ??= new Vector[glyphPositions.Length];
var offsetX = position.XOffset * textScale;
@ -138,10 +135,7 @@ namespace Avalonia.Skia
private static void SetAdvance(ReadOnlySpan<GlyphPosition> glyphPositions, int index, double textScale,
ref double[] advanceBuffer)
{
if (advanceBuffer == null)
{
advanceBuffer = new double[glyphPositions.Length];
}
advanceBuffer ??= new double[glyphPositions.Length];
// Depends on direction of layout
// advanceBuffer[index] = buffer.GlyphPositions[index].YAdvance * textScale;

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