public void Measure(char[] textBuffer, int startAt, int len, out float width, out float height)
{
glyphLayout.Typeface = this.CurrentTypeFace;
var scale = CurrentTypeFace.CalculateToPixelScaleFromPointSize(this.FontSizeInPoints);
MeasuredStringBox strBox;
glyphLayout.MeasureString(textBuffer, startAt, len, out strBox, scale);
width = strBox.width;
height = strBox.CalculateLineHeight();
}
public Size MeasureString(char[] str, int startAt, int len, RequestFont font)
{
//resolve type face
Typeface typeface = typefaceStore.GetTypeface(font.Name, InstalledFontStyle.Normal);
glyphLayout.Typeface = typeface;
MeasuredStringBox result;
float scale = typeface.CalculateToPixelScaleFromPointSize(font.SizeInPoints);
//measure string at specific px scale
glyphLayout.MeasureString(str, startAt, len, out result, scale);
return(new Size((int)result.width, (int)result.CalculateLineHeight()));
}