public GlyphRun ShapeText(ReadOnlySlice <char> text, TextFormat textFormat)
{
var glyphTypeface = textFormat.Typeface.GlyphTypeface;
var glyphIndices = new ushort[text.Length];
var height = textFormat.FontMetrics.LineHeight;
var width = 0.0;
for (var i = 0; i < text.Length;)
{
var index = i;
var codepoint = Codepoint.ReadAt(text, i, out var count);
i += count;
var glyph = glyphTypeface.GetGlyph(codepoint);
glyphIndices[index] = glyph;
width += glyphTypeface.GetGlyphAdvance(glyph);
}
return(new GlyphRun(glyphTypeface, textFormat.FontRenderingEmSize, glyphIndices, characters: text,
bounds: new Rect(0, 0, width, height)));
}
private int GetUnicodeEndpointDataSize(string codepoint)
{
var cp = new Codepoint(codepoint);
var charBuf = Encoding.UTF8.GetBytes(cp.AsString() + "\n");
return(charBuf.Length);
}
public void IsSurrogate_ShouldReturnTrue_IfCodepointIsSurrogate(int code, bool expected)
{
// Arrange
var codepoint = Codepoint.Get(code);
// Act
var result = codepoint.IsSurrogate();
// Assert
result.Should().Be(expected);
}
public static Codepoint ParseSingleLetter(string letter)
{
if (letter[0] == '\\')
{
var handle = ParseEscape(letter) as RangeSetHandle.Static;
if ((handle == null) || !handle.TryGetSingle(out var result))
{
throw new InvalidOperationException("A single character was expected, but a character class was found");
}
return(result);
}
return(Codepoint.FromChars(letter));
}
/// <summary>
/// Creates a shapeable text run with unique properties.
/// </summary>
/// <param name="text">The text to create text runs from.</param>
/// <param name="defaultProperties">The default text run properties.</param>
/// <returns>A list of shapeable text runs.</returns>
private ShapeableTextCharacters CreateShapeableRun(ReadOnlySlice <char> text, TextRunProperties defaultProperties)
{
var defaultTypeface = defaultProperties.Typeface;
var currentTypeface = defaultTypeface;
if (TryGetRunProperties(text, currentTypeface, defaultTypeface, out var count))
{
return(new ShapeableTextCharacters(text.Take(count),
new GenericTextRunProperties(currentTypeface, defaultProperties.FontRenderingEmSize,
defaultProperties.TextDecorations, defaultProperties.ForegroundBrush)));
}
var codepoint = Codepoint.ReadAt(text, count, out _);
//ToDo: Fix FontFamily fallback
var matchFound =
FontManager.Current.TryMatchCharacter(codepoint, defaultTypeface.Style, defaultTypeface.Weight,
defaultTypeface.FontFamily, defaultProperties.CultureInfo, out currentTypeface);
if (matchFound && TryGetRunProperties(text, currentTypeface, defaultTypeface, out count))
{
//Fallback found
return(new ShapeableTextCharacters(text.Take(count),
new GenericTextRunProperties(currentTypeface, defaultProperties.FontRenderingEmSize,
defaultProperties.TextDecorations, defaultProperties.ForegroundBrush)));
}
// no fallback found
currentTypeface = defaultTypeface;
var glyphTypeface = currentTypeface.GlyphTypeface;
var enumerator = new GraphemeEnumerator(text);
while (enumerator.MoveNext())
{
var grapheme = enumerator.Current;
if (!grapheme.FirstCodepoint.IsWhiteSpace && glyphTypeface.TryGetGlyph(grapheme.FirstCodepoint, out _))
{
break;
}
count += grapheme.Text.Length;
}
return(new ShapeableTextCharacters(text.Take(count),
new GenericTextRunProperties(currentTypeface, defaultProperties.FontRenderingEmSize,
defaultProperties.TextDecorations, defaultProperties.ForegroundBrush)));
}
/// <summary>
/// Creates a text style run with unique properties.
/// </summary>
/// <param name="text">The text to create text runs from.</param>
/// <param name="defaultStyle"></param>
/// <returns>A list of text runs.</returns>
protected TextStyleRun CreateShapableTextStyleRun(ReadOnlySlice <char> text, TextStyle defaultStyle)
{
var defaultTypeface = defaultStyle.TextFormat.Typeface;
var currentTypeface = defaultTypeface;
if (TryGetRunProperties(text, currentTypeface, defaultTypeface, out var count))
{
return(new TextStyleRun(new TextPointer(text.Start, count), new TextStyle(currentTypeface,
defaultStyle.TextFormat.FontRenderingEmSize,
defaultStyle.Foreground, defaultStyle.TextDecorations)));
}
var codepoint = Codepoint.ReadAt(text, count, out _);
//ToDo: Fix FontFamily fallback
currentTypeface =
FontManager.Current.MatchCharacter(codepoint, defaultTypeface.Weight, defaultTypeface.Style);
if (currentTypeface != null && TryGetRunProperties(text, currentTypeface, defaultTypeface, out count))
{
//Fallback found
return(new TextStyleRun(new TextPointer(text.Start, count), new TextStyle(currentTypeface,
defaultStyle.TextFormat.FontRenderingEmSize,
defaultStyle.Foreground, defaultStyle.TextDecorations)));
}
// no fallback found
currentTypeface = defaultTypeface;
var glyphTypeface = currentTypeface.GlyphTypeface;
var enumerator = new GraphemeEnumerator(text);
while (enumerator.MoveNext())
{
var grapheme = enumerator.Current;
if (!grapheme.FirstCodepoint.IsWhiteSpace && glyphTypeface.TryGetGlyph(grapheme.FirstCodepoint, out _))
{
break;
}
count += grapheme.Text.Length;
}
return(new TextStyleRun(new TextPointer(text.Start, count),
new TextStyle(currentTypeface, defaultStyle.TextFormat.FontRenderingEmSize,
defaultStyle.Foreground, defaultStyle.TextDecorations)));
}
public static bool IsStartOfWord(string text, int index)
{
if (index >= text.Length)
{
return(false);
}
var codepoint = new Codepoint(text[index]);
// A 'word' starts with an AlphaNumeric or some punctuation symbols immediately
// preceeded by lwsp.
if (index > 0)
{
var previousCodepoint = new Codepoint(text[index - 1]);
if (!previousCodepoint.IsWhiteSpace)
{
return(false);
}
if (previousCodepoint.IsBreakChar)
{
return(true);
}
}
switch (codepoint.GeneralCategory)
{
case GeneralCategory.LowercaseLetter:
case GeneralCategory.TitlecaseLetter:
case GeneralCategory.UppercaseLetter:
case GeneralCategory.DecimalNumber:
case GeneralCategory.LetterNumber:
case GeneralCategory.OtherNumber:
case GeneralCategory.DashPunctuation:
case GeneralCategory.InitialPunctuation:
case GeneralCategory.OpenPunctuation:
case GeneralCategory.CurrencySymbol:
case GeneralCategory.MathSymbol:
return(true);
// TODO: How do you do this in .NET?
// case UnicodeCategory.OtherPunctuation:
// // words cannot start with '.', but they can start with '&' or '*' (for example)
// return g_unichar_break_type(buffer->text[index]) == G_UNICODE_BREAK_ALPHABETIC;
default:
return(false);
}
}
public static IEnumerable <Grapheme> FromCharsMany(IEnumerable <char> chars)
{
using (var enumerator = chars.GetEnumerator()) {
if (!enumerator.MoveNext())
{
yield break;
}
var builder = new StringBuilder(16);
do
{
var ch = enumerator.Current;
if (Codepoint.IsCombiningMark((int)ch))
{
if (builder.Length == 0)
{
throw new ArgumentException("A grapheme must start with a non-combining character", nameof(value));
}
builder.Append(ch);
}
else
{
if (builder.Length > 0)
{
yield return(new Grapheme(builder.ToString(), false));
builder.Clear();
}
builder.Append(ch);
if (char.IsHighSurrogate(ch))
{
if (!enumerator.MoveNext() || !char.IsLowSurrogate(enumerator.Current))
{
throw new ArgumentException("A low surrogate must always follow a high surrogate", nameof(value));
}
builder.Append(enumerator.Current);
}
else if (char.IsLowSurrogate(ch))
{
throw new ArgumentException("A low surrogate is not valid without a preceding high surrogate", nameof(value));
}
}
} while (enumerator.MoveNext());
if (builder.Length > 0)
{
yield return(new Grapheme(builder.ToString(), false));
}
}
}
public bool TryGetSingle(out Codepoint ch)
{
var set = this.Negate ? ~this.Charset : this.Charset;
if (set.Count == 1)
{
var range = set[0];
if (range.From.CompareTo(range.To) == 0)
{
ch = range.From;
return(true);
}
}
ch = Codepoints.EOF;
return(false);
}
/// <summary>
/// Tries to find the next character hit.
/// </summary>
/// <param name="characterHit">The current character hit.</param>
/// <param name="nextCharacterHit">The next character hit.</param>
/// <returns></returns>
private bool TryFindNextCharacterHit(CharacterHit characterHit, out CharacterHit nextCharacterHit)
{
nextCharacterHit = characterHit;
var codepointIndex = characterHit.FirstCharacterIndex + characterHit.TrailingLength;
if (codepointIndex > TextRange.End)
{
return(false); // Cannot go forward anymore
}
var runIndex = GetRunIndexAtCodepointIndex(codepointIndex);
while (runIndex < TextRuns.Count)
{
var run = _textRuns[runIndex];
var foundCharacterHit = run.GlyphRun.FindNearestCharacterHit(characterHit.FirstCharacterIndex + characterHit.TrailingLength, out _);
var isAtEnd = foundCharacterHit.FirstCharacterIndex + foundCharacterHit.TrailingLength ==
TextRange.Length;
var characterIndex = codepointIndex - run.Text.Start;
var codepoint = Codepoint.ReadAt(run.GlyphRun.Characters, characterIndex, out _);
if (codepoint.IsBreakChar)
{
foundCharacterHit = run.GlyphRun.FindNearestCharacterHit(codepointIndex - 1, out _);
isAtEnd = true;
}
nextCharacterHit = isAtEnd || characterHit.TrailingLength != 0 ?
foundCharacterHit :
new CharacterHit(foundCharacterHit.FirstCharacterIndex + foundCharacterHit.TrailingLength);
if (isAtEnd || nextCharacterHit.FirstCharacterIndex > characterHit.FirstCharacterIndex)
{
return(true);
}
runIndex++;
}
return(false);
}
public static RangeSet <Codepoint> CaseInsensitive(this RangeSet <Codepoint> input)
{
var result = input;
foreach (var c in input.Expand())
{
if (Codepoint.IsUpper(c))
{
result |= Codepoint.ToLowerInvariant(c);
}
else if (Codepoint.IsLower(c))
{
result |= Codepoint.ToUpperInvariant(c);
}
}
return(result);
}
private static void FillBuffer(Buffer buffer, ReadOnlySlice <char> text)
{
buffer.ContentType = ContentType.Unicode;
var i = 0;
while (i < text.Length)
{
var codepoint = Codepoint.ReadAt(text, i, out var count);
var cluster = (uint)(text.Start + i);
if (codepoint.IsBreakChar)
{
if (i + 1 < text.Length)
{
var nextCodepoint = Codepoint.ReadAt(text, i + 1, out _);
if (nextCodepoint == '\r' && codepoint == '\n' || nextCodepoint == '\n' && codepoint == '\r')
{
count++;
buffer.Add('\u200C', cluster);
buffer.Add('\u200D', cluster);
}
else
{
buffer.Add('\u200C', cluster);
}
}
else
{
buffer.Add('\u200C', cluster);
}
}
else
{
buffer.Add(codepoint, cluster);
}
i += count;
}
}
public ShapedBuffer ShapeText(ReadOnlySlice <char> text, GlyphTypeface typeface, double fontRenderingEmSize,
CultureInfo culture, sbyte bidiLevel)
{
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);
}
/// <summary>
/// Measures the number of characters that fit into available width.
/// </summary>
/// <param name="availableWidth">The available width.</param>
/// <param name="length">The count of fitting characters.</param>
/// <returns>
/// <c>true</c> if characters fit into the available width; otherwise, <c>false</c>.
/// </returns>
internal bool TryMeasureCharacters(double availableWidth, out int length)
{
length = 0;
var currentWidth = 0.0;
for (var i = 0; i < ShapedBuffer.Length; i++)
{
var advance = ShapedBuffer.GlyphAdvances[i];
if (currentWidth + advance > availableWidth)
{
break;
}
Codepoint.ReadAt(GlyphRun.Characters, length, out var count);
length += count;
currentWidth += advance;
}
return(length > 0);
}
internal bool TryMeasureCharactersBackwards(double availableWidth, out int length, out double width)
{
length = 0;
width = 0;
for (var i = ShapedBuffer.Length - 1; i >= 0; i--)
{
var advance = ShapedBuffer.GlyphAdvances[i];
if (width + advance > availableWidth)
{
break;
}
Codepoint.ReadAt(GlyphRun.Characters, length, out var count);
length += count;
width += advance;
}
return(length > 0);
}
public override Errno OnReadHandle(
string file,
PathInfo info,
byte[] buf,
long offset,
out int bytesRead)
{
Trace.WriteLine($"OnReadHandle {file} Flags={info.OpenFlags}");
string content = null;
if (file.StartsWith($"/{UnicodePath}"))
{
var codepointString = file.Replace("/unicode/", "");
var cp = new Codepoint(codepointString);
var codeUnit = cp.AsString() + "\n";
bytesRead = CopyBuf(codeUnit, buf, codeUnit.Length);
return(0);
}
else if (file.StartsWith($"/{AlphaPath}"))
{
content = AlphaContent;
}
else if (file.StartsWith($"/{NumericPath}"))
{
content = NumericContent;
}
else
{
bytesRead = -1;
return(0);
}
int toBeReadCount = buf.Length;
bytesRead = CopyBuf(content, buf, toBeReadCount, (int)offset);
return(0);
}
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);
}
internal static string ProcessAllPlanes([NotNull] this IEnumerable <char> that, Func <char, char> processChar, Func <Codepoint, Codepoint> processCodepoint)
{
if (that == null)
{
throw new ArgumentNullException(nameof(that));
}
var result = new StringBuilder((that as string)?.Length ?? (that as ICollection <char>)?.Count ?? 128);
using (var enumerator = that.GetEnumerator()) {
while (enumerator.MoveNext())
{
if (char.IsSurrogate(enumerator.Current))
{
processCodepoint(Codepoint.FromCharEnumerator(enumerator)).AppendTo(result);
}
else
{
result.Append(processChar(enumerator.Current));
}
}
}
return(result.ToString());
}
protected IEnumerable <Codepoint> GenerateCaseInsensitiveCodepoints(Codepoint codepoint)
{
if (codepoint.FitsIntoChar)
{
var orig = (char)codepoint;
yield return(orig);
var upper = char.ToUpperInvariant(orig);
if (upper != orig)
{
yield return(upper);
}
var lower = char.ToLowerInvariant(orig);
if (upper != lower)
{
yield return(lower);
}
}
else
{
yield return(codepoint);
}
}
private Grapheme(string value, bool check)
{
if (check)
{
using (var enumerator = value.GetEnumerator()) {
if (!enumerator.MoveNext())
{
throw new ArgumentException("An empty string is not a valid grapheme", nameof(value));
}
if (Codepoint.IsCombiningMark(Codepoint.FromCharEnumerator(enumerator)))
{
throw new ArgumentException("A grapheme cannot start with a combining character", nameof(value));
}
while (enumerator.MoveNext())
{
if (!Codepoint.IsCombiningMark(Codepoint.FromCharEnumerator(enumerator)))
{
throw new ArgumentException("A grapheme cannot contain more than one non-combining character", nameof(value));
}
}
}
}
this.value = value;
}
public GlyphRun ShapeText(ReadOnlySlice <char> text, Typeface typeface, double fontRenderingEmSize, CultureInfo culture)
{
var glyphTypeface = typeface.GlyphTypeface;
var glyphIndices = new ushort[text.Length];
var glyphCount = 0;
for (var i = 0; i < text.Length;)
{
var index = i;
var codepoint = Codepoint.ReadAt(text, i, out var count);
i += count;
var glyph = glyphTypeface.GetGlyph(codepoint);
glyphIndices[index] = glyph;
glyphCount++;
}
return(new GlyphRun(glyphTypeface, fontRenderingEmSize,
new ReadOnlySlice <ushort>(glyphIndices.AsMemory(0, glyphCount)), characters: text));
}
public static RangeSetHandle ParseEscape(string escape)
{
var match = rxEscape.Match(escape);
if (!match.Success)
{
throw new ArgumentException("Escape is invalid", "escape");
}
if (match.Groups["name"].Success)
{
return(new RangeSetHandle.Static(UnicodeRanges.FromUnicodeName(match.Groups["name"].Value), match.Groups["c"].Value == "P"));
}
if (match.Groups["hex"].Success)
{
return(new RangeSetHandle.Static(Codepoint.Parse(match.Groups["hex"].Value)));
}
var c = match.Groups["c"].Value[0];
switch (c)
{
case '0':
return(new RangeSetHandle.Static('\0'));
case 'r':
return(new RangeSetHandle.Static('\r'));
case 'n':
return(new RangeSetHandle.Static('\n'));
case 't':
return(new RangeSetHandle.Static('\t'));
case 'a':
return(new RangeSetHandle.Static('\x07'));
case 'e':
return(new RangeSetHandle.Static('\x1B'));
case 'f':
return(new RangeSetHandle.Static('\x0C'));
case 'v':
return(new RangeSetHandle.Static('\x0B'));
case 'd':
return(new RangeSetHandle.Class(CharSetClass.Digit, false));
case 'D':
return(new RangeSetHandle.Class(CharSetClass.Digit, true));
case 'w':
return(new RangeSetHandle.Class(CharSetClass.Word, false));
case 'W':
return(new RangeSetHandle.Class(CharSetClass.Word, true));
case 's':
return(new RangeSetHandle.Class(CharSetClass.Space, false));
case 'S':
return(new RangeSetHandle.Class(CharSetClass.Space, true));
default:
if (char.IsLetterOrDigit(c))
{
throw new ArgumentOutOfRangeException(nameof(escape), "Invalid escape character " + c);
}
return(new RangeSetHandle.Static(c));
}
}
public void OnSkinToneSelected(Codepoint skinTone)
{
MODEL.OnSkinToneSelected(skinTone);
}
/// <summary>
/// Coalesces ranges of the same bidi level to form <see cref="ShapeableTextCharacters"/>
/// </summary>
/// <param name="textCharacters">The text characters to form <see cref="ShapeableTextCharacters"/> from.</param>
/// <param name="levels">The bidi levels.</param>
/// <returns></returns>
private static IEnumerable <IReadOnlyList <TextRun> > CoalesceLevels(
IReadOnlyList <TextRun> textCharacters,
ReadOnlySlice <sbyte> levels)
{
if (levels.Length == 0)
{
yield break;
}
var levelIndex = 0;
var runLevel = levels[0];
TextRunProperties?previousProperties = null;
TextCharacters? currentRun = null;
var runText = ReadOnlySlice <char> .Empty;
for (var i = 0; i < textCharacters.Count; i++)
{
var j = 0;
currentRun = textCharacters[i] as TextCharacters;
if (currentRun == null)
{
var drawableRun = textCharacters[i];
yield return(new[] { drawableRun });
levelIndex += drawableRun.TextSourceLength;
continue;
}
runText = currentRun.Text;
for (; j < runText.Length;)
{
Codepoint.ReadAt(runText, j, out var count);
if (levelIndex + 1 == levels.Length)
{
break;
}
levelIndex++;
j += count;
if (j == runText.Length)
{
yield return(currentRun.GetShapeableCharacters(runText.Take(j), runLevel, ref previousProperties));
runLevel = levels[levelIndex];
continue;
}
if (levels[levelIndex] == runLevel)
{
continue;
}
// End of this run
yield return(currentRun.GetShapeableCharacters(runText.Take(j), runLevel, ref previousProperties));
runText = runText.Skip(j);
j = 0;
// Move to next run
runLevel = levels[levelIndex];
}
}
if (currentRun is null || runText.IsEmpty)
{
yield break;
}
yield return(currentRun.GetShapeableCharacters(runText, runLevel, ref previousProperties));
}
public static StringBuilder Append(this StringBuilder that, Codepoint codepoint)
{
codepoint.AppendTo(that);
return(that);
}
public static IEnumerable <Codepoint> ToCodepoints(this IEnumerable <char> that)
{
return(Codepoint.FromCharsMany(that));
}
public Static(Codepoint ch) : this(new RangeSet <Codepoint>(ch), false)
{
}
public Static(Codepoint from, Codepoint to) : this(new RangeSet <Codepoint>(Range <Codepoint> .Create(from, to)), false)
{
}
public GlyphRun ShapeText(ReadOnlySlice <char> text, Typeface typeface, double fontRenderingEmSize, CultureInfo culture)
{
using (var buffer = new Buffer())
{
buffer.ContentType = ContentType.Unicode;
var breakCharPosition = text.Length - 1;
var codepoint = Codepoint.ReadAt(text, breakCharPosition, out var count);
if (codepoint.IsBreakChar)
{
var breakCharCount = 1;
if (text.Length > 1)
{
var previousCodepoint = Codepoint.ReadAt(text, breakCharPosition - count, out _);
if (codepoint == '\r' && previousCodepoint == '\n' ||
codepoint == '\n' && previousCodepoint == '\r')
{
breakCharCount = 2;
}
}
if (breakCharPosition != text.Start)
{
buffer.AddUtf16(text.Buffer.Span.Slice(0, text.Length - breakCharCount));
}
var cluster = buffer.GlyphInfos.Length > 0 ?
buffer.GlyphInfos[buffer.Length - 1].Cluster + 1 :
(uint)text.Start;
switch (breakCharCount)
{
case 1:
buffer.Add('\u200C', cluster);
break;
case 2:
buffer.Add('\u200C', cluster);
buffer.Add('\u200D', cluster);
break;
}
}
else
{
buffer.AddUtf16(text.Buffer.Span);
}
buffer.Language = new Language(culture ?? CultureInfo.CurrentCulture);
buffer.GuessSegmentProperties();
var glyphTypeface = typeface.GlyphTypeface;
var font = ((GlyphTypefaceImpl)glyphTypeface.PlatformImpl).Font;
font.Shape(buffer);
font.GetScale(out var scaleX, out _);
var textScale = fontRenderingEmSize / scaleX;
var bufferLength = buffer.Length;
var glyphInfos = buffer.GetGlyphInfoSpan();
var glyphPositions = buffer.GetGlyphPositionSpan();
var glyphIndices = new ushort[bufferLength];
var clusters = new ushort[bufferLength];
double[] glyphAdvances = null;
Vector[] glyphOffsets = null;
for (var i = 0; i < bufferLength; i++)
{
glyphIndices[i] = (ushort)glyphInfos[i].Codepoint;
clusters[i] = (ushort)(text.Start + glyphInfos[i].Cluster);
if (!glyphTypeface.IsFixedPitch)
{
SetAdvance(glyphPositions, i, textScale, ref glyphAdvances);
}
SetOffset(glyphPositions, i, textScale, ref glyphOffsets);
}
return(new GlyphRun(glyphTypeface, fontRenderingEmSize,
new ReadOnlySlice <ushort>(glyphIndices),
new ReadOnlySlice <double>(glyphAdvances),
new ReadOnlySlice <Vector>(glyphOffsets),
text,
new ReadOnlySlice <ushort>(clusters)));
}
}
public GlyphRun ShapeText(ReadOnlySlice <char> text, TextFormat textFormat)
{
using (var buffer = new Buffer())
{
buffer.ContentType = ContentType.Unicode;
var breakCharPosition = text.Length - 1;
var codepoint = Codepoint.ReadAt(text, breakCharPosition, out var count);
if (codepoint.IsBreakChar)
{
var breakCharCount = 1;
if (text.Length > 1)
{
var previousCodepoint = Codepoint.ReadAt(text, breakCharPosition - count, out _);
if (codepoint == '\r' && previousCodepoint == '\n' ||
codepoint == '\n' && previousCodepoint == '\r')
{
breakCharCount = 2;
}
}
if (breakCharPosition != text.Start)
{
buffer.AddUtf16(text.Buffer.Span.Slice(0, text.Length - breakCharCount));
}
var cluster = buffer.GlyphInfos.Length > 0 ?
buffer.GlyphInfos[buffer.Length - 1].Cluster + 1 :
(uint)text.Start;
switch (breakCharCount)
{
case 1:
buffer.Add('\u200C', cluster);
break;
case 2:
buffer.Add('\u200C', cluster);
buffer.Add('\u200D', cluster);
break;
}
}
else
{
buffer.AddUtf16(text.Buffer.Span);
}
buffer.GuessSegmentProperties();
var glyphTypeface = textFormat.Typeface.GlyphTypeface;
var font = ((GlyphTypefaceImpl)glyphTypeface.PlatformImpl).Font;
font.Shape(buffer);
font.GetScale(out var scaleX, out _);
var textScale = textFormat.FontRenderingEmSize / scaleX;
var len = buffer.Length;
var info = buffer.GetGlyphInfoSpan();
var pos = buffer.GetGlyphPositionSpan();
var glyphIndices = new ushort[len];
var clusters = new ushort[len];
var glyphAdvances = new double[len];
var glyphOffsets = new Vector[len];
for (var i = 0; i < len; i++)
{
glyphIndices[i] = (ushort)info[i].Codepoint;
clusters[i] = (ushort)(text.Start + info[i].Cluster);
var advanceX = pos[i].XAdvance * textScale;
// Depends on direction of layout
//var advanceY = pos[i].YAdvance * textScale;
glyphAdvances[i] = advanceX;
var offsetX = pos[i].XOffset * textScale;
var offsetY = pos[i].YOffset * textScale;
glyphOffsets[i] = new Vector(offsetX, offsetY);
}
return(new GlyphRun(glyphTypeface, textFormat.FontRenderingEmSize,
new ReadOnlySlice <ushort>(glyphIndices),
new ReadOnlySlice <double>(glyphAdvances),
new ReadOnlySlice <Vector>(glyphOffsets),
text,
new ReadOnlySlice <ushort>(clusters)));
}
}
