/// <summary>
/// Compute a shaped glyph run object from specified glyph-based info
/// </summary>
internal sealed override GlyphRun ComputeShapedGlyphRun(
Point origin,
char[] characterString,
ushort[] clusterMap,
ushort[] glyphIndices,
IList <double> glyphAdvances,
IList <Point> glyphOffsets,
bool rightToLeft,
bool sideways
)
{
Invariant.Assert(_shapeTypeface != null);
Invariant.Assert(glyphIndices != null);
// Device fonts are only used through the LS non-glyphed code path. Only when a DigitCulture is set
// will a potential device font be ignored and come through shaping.
Invariant.Assert(_shapeTypeface.DeviceFont == null || _textItem.DigitCulture != null);
bool[] caretStops = null;
if (clusterMap != null &&
(HasExtendedCharacter || NeedsCaretInfo)
)
{
caretStops = new bool[clusterMap.Length + 1];
// caret stops at cluster boundaries, the first and the last entries are always set
caretStops[0] = true;
caretStops[clusterMap.Length] = true;
ushort lastGlyph = clusterMap[0];
for (int i = 1; i < clusterMap.Length; i++)
{
ushort glyph = clusterMap[i];
if (glyph != lastGlyph)
{
caretStops[i] = true;
lastGlyph = glyph;
}
}
}
return(GlyphRun.TryCreate(
_shapeTypeface.GlyphTypeface,
(rightToLeft ? 1 : 0),
sideways,
_emSize,
glyphIndices,
origin,
glyphAdvances,
glyphOffsets,
characterString,
null,
clusterMap,
caretStops,
XmlLanguage.GetLanguage(CultureMapper.GetSpecificCulture(_properties.CultureInfo).IetfLanguageTag),
_textFormattingMode
));
}