public void DoLayout()
{
//----------------
//TODO: use typography text service
//it should be faster since it has glyph-plan cache
//----------------
//user can use other native methods
//to do the layout ***
//the following code is how-to-layout with
//our Typography lib
//
//then at this step
//we calculate span size
//resolve each font style
_glyphLayout.EnableComposition = true;
_glyphLayout.EnableLigature = true;
int lineCount = _lines.Count;
Typeface selectedTypeface = this.DefaultTypeface;
float pxscale = selectedTypeface.CalculateScaleToPixelFromPointSize(this.FontSizeInPts);
for (int i = 0; i < lineCount; ++i)
{
EditableTextLine line = _lines[i];
List <IRun> runList = line.UnsageGetTextRunList();
int runCount = runList.Count;
for (int r = 0; r < runCount; ++r)
{
TextRun tt = runList[r] as TextRun;
if (tt == null)
{
continue;
}
//this is text run
if (tt.IsMeasured)
{
continue;
}
//
TextRunFontStyle fontStyle = tt.FontStyle;
//resolve to actual font face
TextBuffer buffer = tt.TextBuffer;
char[] rawBuffer = buffer.UnsafeGetInternalBuffer();
int preCount = _outputGlyphPlan.Count;
_glyphLayout.Typeface = selectedTypeface;
_glyphLayout.Layout(rawBuffer, tt.StartAt, tt.Len);
//use pixel-scale-layout-engine to scale to specific font size
//or scale it manually
int postCount = _outputGlyphPlan.Count;
//
tt.SetGlyphPlanSeq(new GlyphPlanSequence(_outputGlyphPlan, preCount, postCount - preCount));
tt.IsMeasured = true;
//
}
}
}