public ShapedBuffer ShapeText(ReadOnlySlice <char> text, TextShaperOptions options)
{
var typeface = options.Typeface;
var fontRenderingEmSize = options.FontRenderingEmSize;
var bidiLevel = options.BidLevel;
var culture = options.Culture;
using (var buffer = new Buffer())
{
buffer.AddUtf16(text.Buffer.Span, text.Start, text.Length);
MergeBreakPair(buffer);
buffer.GuessSegmentProperties();
buffer.Direction = (bidiLevel & 1) == 0 ? Direction.LeftToRight : Direction.RightToLeft;
buffer.Language = new Language(culture ?? CultureInfo.CurrentCulture);
var font = ((HarfBuzzGlyphTypefaceImpl)typeface.PlatformImpl).Font;
font.Shape(buffer);
if (buffer.Direction == Direction.RightToLeft)
{
buffer.Reverse();
}
font.GetScale(out var scaleX, out _);
var textScale = fontRenderingEmSize / scaleX;
var bufferLength = buffer.Length;
var shapedBuffer = new ShapedBuffer(text, bufferLength, typeface, fontRenderingEmSize, bidiLevel);
var glyphInfos = buffer.GetGlyphInfoSpan();
var glyphPositions = buffer.GetGlyphPositionSpan();
for (var i = 0; i < bufferLength; i++)
{
var sourceInfo = glyphInfos[i];
var glyphIndex = (ushort)sourceInfo.Codepoint;
var glyphCluster = (int)sourceInfo.Cluster;
var glyphAdvance = GetGlyphAdvance(glyphPositions, i, textScale);
var glyphOffset = GetGlyphOffset(glyphPositions, i, textScale);
var targetInfo = new Media.TextFormatting.GlyphInfo(glyphIndex, glyphCluster, glyphAdvance, glyphOffset);
shapedBuffer[i] = targetInfo;
}
return(shapedBuffer);
}
}
public void Should_Get_CharacterHit_From_Distance(string text, sbyte direction)
{
using (Start())
{
var options = new TextShaperOptions(Typeface.Default.GlyphTypeface, 10, direction, CultureInfo.CurrentCulture);
var shapedBuffer =
TextShaper.Current.ShapeText(text.AsMemory(), options);
var glyphRun = CreateGlyphRun(shapedBuffer);
if (glyphRun.IsLeftToRight)
{
var characterHit =
glyphRun.GetCharacterHitFromDistance(glyphRun.Metrics.WidthIncludingTrailingWhitespace, out _);
Assert.Equal(glyphRun.Characters.Length, characterHit.FirstCharacterIndex + characterHit.TrailingLength);
}
else
{
shapedBuffer.GlyphInfos.Span.Reverse();
var characterHit =
glyphRun.GetCharacterHitFromDistance(0, out _);
Assert.Equal(glyphRun.Characters.Length, characterHit.FirstCharacterIndex + characterHit.TrailingLength);
}
var rects = BuildRects(glyphRun);
var lastCluster = -1;
var index = 0;
if (!glyphRun.IsLeftToRight)
{
rects.Reverse();
}
foreach (var rect in rects)
{
var currentCluster = glyphRun.GlyphClusters[index];
while (currentCluster == lastCluster && index + 1 < glyphRun.GlyphClusters.Count)
{
currentCluster = glyphRun.GlyphClusters[++index];
}
//Non trailing edge
var distance = glyphRun.IsLeftToRight ? rect.Left : rect.Right;
var characterHit = glyphRun.GetCharacterHitFromDistance(distance, out _);
Assert.Equal(currentCluster, characterHit.FirstCharacterIndex + characterHit.TrailingLength);
lastCluster = currentCluster;
index++;
}
}
}
public ShapedBuffer ShapeText(ReadOnlySlice <char> text, TextShaperOptions options)
{
var typeface = options.Typeface;
var fontRenderingEmSize = options.FontRenderingEmSize;
var bidiLevel = options.BidiLevel;
return(new ShapedBuffer(text, text.Length, typeface, fontRenderingEmSize, bidiLevel));
}
public void Should_Apply_IncrementalTabWidth()
{
using (Start())
{
var text = "\t".AsMemory();
var options = new TextShaperOptions(Typeface.Default.GlyphTypeface, 12, 0, CultureInfo.CurrentCulture, 100);
var shapedBuffer = TextShaper.Current.ShapeText(text, options);
Assert.Equal(shapedBuffer.Length, text.Length);
Assert.Equal(100, shapedBuffer.GlyphAdvances[0]);
}
}
public void Should_Form_Clusters_For_BreakPairs()
{
using (Start())
{
var text = "\n\r\n".AsMemory();
var options = new TextShaperOptions(Typeface.Default.GlyphTypeface, 12, 0, CultureInfo.CurrentCulture);
var shapedBuffer = TextShaper.Current.ShapeText(text, options);
Assert.Equal(shapedBuffer.Text.Length, text.Length);
Assert.Equal(shapedBuffer.GlyphClusters.Count, text.Length);
Assert.Equal(0, shapedBuffer.GlyphClusters[0]);
Assert.Equal(1, shapedBuffer.GlyphClusters[1]);
Assert.Equal(1, shapedBuffer.GlyphClusters[2]);
}
}
public void Should_Get_Previous_CharacterHit(string text, sbyte direction)
{
using (Start())
{
var options = new TextShaperOptions(Typeface.Default.GlyphTypeface, 10, direction, CultureInfo.CurrentCulture);
var shapedBuffer =
TextShaper.Current.ShapeText(text.AsMemory(), options);
var glyphRun = CreateGlyphRun(shapedBuffer);
var characterHit = new CharacterHit(text.Length);
var rects = BuildRects(glyphRun);
rects.Reverse();
if (glyphRun.IsLeftToRight)
{
foreach (var rect in rects)
{
characterHit = glyphRun.GetPreviousCaretCharacterHit(characterHit);
var distance = glyphRun.GetDistanceFromCharacterHit(characterHit);
Assert.Equal(rect.Left, distance);
}
}
else
{
shapedBuffer.GlyphInfos.Span.Reverse();
foreach (var rect in rects)
{
characterHit = glyphRun.GetPreviousCaretCharacterHit(characterHit);
var distance = glyphRun.GetDistanceFromCharacterHit(characterHit);
Assert.Equal(rect.Right, distance);
}
}
}
}
public ShapedBuffer ShapeText(ReadOnlySlice <char> text, TextShaperOptions options)
{
var typeface = options.Typeface;
var fontRenderingEmSize = options.FontRenderingEmSize;
var bidiLevel = options.BidLevel;
var shapedBuffer = new ShapedBuffer(text, text.Length, typeface, fontRenderingEmSize, bidiLevel);
for (var i = 0; i < shapedBuffer.Length;)
{
var glyphCluster = i + text.Start;
var codepoint = Codepoint.ReadAt(text, i, out var count);
var glyphIndex = typeface.GetGlyph(codepoint);
shapedBuffer[i] = new GlyphInfo(glyphIndex, glyphCluster, 10);
i += count;
}
return(shapedBuffer);
}
public ShapedBuffer ShapeText(ReadOnlySlice <char> text, TextShaperOptions options)
{
var typeface = options.Typeface;
var fontRenderingEmSize = options.FontRenderingEmSize;
var bidiLevel = options.BidLevel;
var culture = options.Culture;
using (var buffer = new Buffer())
{
buffer.AddUtf16(text.Buffer.Span, text.BufferOffset, text.Length);
MergeBreakPair(buffer);
buffer.GuessSegmentProperties();
buffer.Direction = Direction.LeftToRight; //Always shape LeftToRight
buffer.Language = new Language(culture ?? CultureInfo.CurrentCulture);
var font = ((GlyphTypefaceImpl)typeface.PlatformImpl).Font;
font.Shape(buffer);
font.GetScale(out var scaleX, out _);
var textScale = fontRenderingEmSize / scaleX;
var bufferLength = buffer.Length;
var shapedBuffer = new ShapedBuffer(text, bufferLength, typeface, fontRenderingEmSize, bidiLevel);
var glyphInfos = buffer.GetGlyphInfoSpan();
var glyphPositions = buffer.GetGlyphPositionSpan();
for (var i = 0; i < bufferLength; i++)
{
var sourceInfo = glyphInfos[i];
var glyphIndex = (ushort)sourceInfo.Codepoint;
var glyphCluster = (int)(sourceInfo.Cluster);
var glyphAdvance = GetGlyphAdvance(glyphPositions, i, textScale);
var glyphOffset = GetGlyphOffset(glyphPositions, i, textScale);
if (glyphIndex == 0 && text.Buffer.Span[glyphCluster] == '\t')
{
glyphIndex = typeface.GetGlyph(' ');
glyphAdvance = options.IncrementalTabWidth > 0 ?
options.IncrementalTabWidth :
4 * typeface.GetGlyphAdvance(glyphIndex) * textScale;
}
var targetInfo = new Avalonia.Media.TextFormatting.GlyphInfo(glyphIndex, glyphCluster, glyphAdvance, glyphOffset);
shapedBuffer[i] = targetInfo;
}
return(shapedBuffer);
}
}
