List <FormattingSpan> EvaluateFormattingSpans(
CanvasTextAnalyzer textAnalyzer,
IReadOnlyList <KeyValuePair <CanvasCharacterRange, CanvasScaledFont> > fontRuns,
IReadOnlyList <KeyValuePair <CanvasCharacterRange, CanvasAnalyzedScript> > scriptRuns,
out float maxLineSpacing)
{
maxLineSpacing = 0;
List <FormattingSpan> formattingSpans = new List <FormattingSpan>();
//
// Divide up our text space into spans of uniform font face and uniform script.
//
foreach (var scriptRun in scriptRuns)
{
var scriptProperties = textAnalyzer.GetScriptProperties(scriptRun.Value);
bool isRightToLeft = IsRightToLeft(scriptProperties.IsoScriptNumber);
foreach (var fontRun in fontRuns)
{
int fontMatchEnd = fontRun.Key.CharacterIndex + fontRun.Key.CharacterCount;
int scriptEnd = scriptRun.Key.CharacterIndex + scriptRun.Key.CharacterCount;
if (fontRun.Key.CharacterIndex > scriptEnd)
{
continue;
}
if (fontMatchEnd < scriptRun.Key.CharacterIndex)
{
continue;
}
int rangeStart = System.Math.Max(fontRun.Key.CharacterIndex, scriptRun.Key.CharacterIndex);
int rangeEnd = System.Math.Min(fontMatchEnd, scriptEnd);
int length = rangeEnd - rangeStart;
float fontSize = desiredFontSize * fontRun.Value.ScaleFactor;
FormattingSpan formattingSpan = new FormattingSpan();
formattingSpan.IsRightToLeft = isRightToLeft;
// Evaluate which glyphs comprise the text.
formattingSpan.Glyphs = textAnalyzer.GetGlyphs(
new CanvasCharacterRange {
CharacterIndex = rangeStart, CharacterCount = length
},
fontRun.Value.FontFace,
fontSize,
false, // isSideways
formattingSpan.IsRightToLeft,
scriptRun.Value);
formattingSpan.FontFace = fontRun.Value.FontFace;
formattingSpan.FontSize = fontSize;
formattingSpans.Add(formattingSpan);
//
// For text which contains non-uniform font faces, CanvasTextLayout takes the maximum of
// all of line spacings and applies it as the overall line spacing. We do the same thing, here.
//
maxLineSpacing = System.Math.Max(maxLineSpacing, GetLineSpacing(formattingSpan.FontFace, fontSize));
}
}
return(formattingSpans);
}
List <FormattingSpan> EvaluateFormattingSpans(
CanvasTextAnalyzer textAnalyzer,
IReadOnlyList <KeyValuePair <CanvasCharacterRange, CanvasScaledFont> > fontRuns,
IReadOnlyList <KeyValuePair <CanvasCharacterRange, CanvasAnalyzedScript> > scriptRuns,
IReadOnlyList <KeyValuePair <CanvasCharacterRange, CanvasAnalyzedBidi> > bidiRuns,
out float maxLineSpacing)
{
maxLineSpacing = 0;
//
// Divide up our text space into spans of uniform font face, script and bidi.
//
List <FormattingSpan> formattingSpans = new List <FormattingSpan>();
FormattingSpanHelper formattingSpanHelper = new FormattingSpanHelper(fontRuns, scriptRuns, bidiRuns);
while (!formattingSpanHelper.IsDone())
{
var scriptProperties = textAnalyzer.GetScriptProperties(formattingSpanHelper.Script);
float fontSize = desiredFontSize * formattingSpanHelper.ScaledFont.ScaleFactor;
FormattingSpan formattingSpan = new FormattingSpan();
int[] clusterMap;
bool[] isShapedAlone;
CanvasGlyphShaping[] glyphShaping;
// Evaluate which glyphs comprise the text.
formattingSpan.Glyphs = textAnalyzer.GetGlyphs(
formattingSpanHelper.Range,
formattingSpanHelper.ScaledFont.FontFace,
fontSize,
false, // isSideways
formattingSpanHelper.Bidi.ResolvedLevel % 2 == 1,
formattingSpanHelper.Script,
"",
null,
null,
out clusterMap,
out isShapedAlone,
out glyphShaping);
formattingSpan.FontFace = formattingSpanHelper.ScaledFont.FontFace;
formattingSpan.FontSize = fontSize;
formattingSpan.Script = formattingSpanHelper.Script;
formattingSpan.ClusterMap = clusterMap;
formattingSpan.GlyphShaping = glyphShaping;
formattingSpan.Range = formattingSpanHelper.Range;
formattingSpan.BidiLevel = formattingSpanHelper.Bidi.ResolvedLevel;
formattingSpan.NeedsAdditionalJustificationCharacters = scriptProperties.JustificationCharacter != null;
formattingSpans.Add(formattingSpan);
//
// For text which contains non-uniform font faces, CanvasTextLayout takes the maximum of
// all of line spacings and applies it as the overall line spacing. We do the same thing, here.
//
maxLineSpacing = System.Math.Max(maxLineSpacing, GetLineSpacing(formattingSpan.FontFace, fontSize));
formattingSpanHelper.MoveNext();
}
return(formattingSpans);
}
