// This method returns the current glyph run.
GlyphRun BeginGlyphRun(Rect rectangle, float advance, LayoutBox currentLayoutBox, FormattingSpan formattingSpan, int lineNumber)
{
GlyphRun glyphRun = new GlyphRun();
glyphRun.FormattingSpan = formattingSpan;
glyphRun.Glyphs = new List <CanvasGlyph>();
currentLayoutBox.AddGlyphRun(glyphRun);
return(glyphRun);
}
//
// Returns the current glyph run, or null if there's no more layout boxes.
//
GlyphRun BeginNewLayoutBox(ref int rectangleIndex, List <Rect> rectangles, ref float glyphRunAdvance, ref int wordsPerLine, FormattingSpan formattingSpan, List <LayoutBox> layoutBoxes)
{
rectangleIndex++;
if (rectangleIndex >= rectangles.Count)
{
return(null);
}
LayoutBox layoutBox = new LayoutBox(rectangles[rectangleIndex]);
layoutBoxes.Add(layoutBox);
glyphRunAdvance = 0;
wordsPerLine = 0;
GlyphRun newGlyphRun = BeginGlyphRun(rectangles[rectangleIndex], glyphRunAdvance, layoutBox, formattingSpan, rectangleIndex);
return(newGlyphRun);
}
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);
}
//
// Returns the current glyph run, or null if there's no more layout boxes.
//
GlyphRun BeginNewLayoutBox(ref int rectangleIndex, List <Rect> rectangles, ref float glyphRunAdvance, ref int wordsPerLine, FormattingSpan formattingSpan, List <GlyphRun> glyphRuns)
{
rectangleIndex++;
if (rectangleIndex >= rectangles.Count)
{
return(null);
}
glyphRunAdvance = 0;
wordsPerLine = 0;
return(BeginGlyphRun(rectangles[rectangleIndex], glyphRunAdvance, glyphRuns, formattingSpan, rectangleIndex));
}
// This method returns the current glyph run.
GlyphRun BeginGlyphRun(Rect rectangle, float advance, List <GlyphRun> glyphRuns, FormattingSpan formattingSpan, int lineNumber)
{
GlyphRun glyphRun = new GlyphRun();
glyphRun.FormattingSpan = formattingSpan;
float glyphRunXPosition = formattingSpan.IsRightToLeft ? (float)rectangle.Right - advance : (float)rectangle.Left + advance;
glyphRun.Position = new System.Numerics.Vector2(glyphRunXPosition, (float)rectangle.Bottom);
glyphRun.Glyphs = new List <CanvasGlyph>();
glyphRun.LineNumber = lineNumber;
glyphRuns.Add(glyphRun);
return(glyphRun);
}
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;
int[] clusterMap;
bool[] isShapedAlone;
CanvasGlyphShaping[] glyphShaping;
CanvasCharacterRange range = new CanvasCharacterRange {
CharacterIndex = rangeStart, CharacterCount = length
};
// Evaluate which glyphs comprise the text.
formattingSpan.Glyphs = textAnalyzer.GetGlyphs(
range,
fontRun.Value.FontFace,
fontSize,
false, // isSideways
formattingSpan.IsRightToLeft,
scriptRun.Value,
"",
null,
null,
out clusterMap,
out isShapedAlone,
out glyphShaping);
formattingSpan.FontFace = fontRun.Value.FontFace;
formattingSpan.FontSize = fontSize;
formattingSpan.Script = scriptRun.Value;
formattingSpan.ClusterMap = clusterMap;
formattingSpan.GlyphShaping = glyphShaping;
formattingSpan.Range = range;
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));
}
}
return(formattingSpans);
}
//
// Returns false if there's no more layout boxes.
//
bool BeginNewLayoutBox(ref int rectangleIndex, List <Rect> rectangles, ref float glyphRunAdvance, ref int wordsPerLine, FormattingSpan formattingSpan, List <GlyphRun> glyphRuns)
{
rectangleIndex++;
if (rectangleIndex >= rectangles.Count)
{
return(false);
}
glyphRunAdvance = 0;
wordsPerLine = 0;
BeginGlyphRun(rectangles[rectangleIndex], glyphRunAdvance, glyphRuns, formattingSpan.FontFace, formattingSpan.FontSize, formattingSpan.IsRightToLeft);
return(true);
}
