public Size MeasureTextSize(string text, FontStyle fontStyle)
{
var emSize = fontStyle.FontHeight.ConvertToUnits(LengthUnits.Points).Quantity;
var fontEmphasis = (fontStyle.FontEmphasis == FontEmphasis.Italic) ? "italic" : "none";
var fontWeight = (fontStyle.FontWeight == FontWeight.Bold) ? "bold" : "normal";
var sizeF = _fontLoader.MeasureString(text, (float)emSize, fontEmphasis, fontWeight);
var size = new Size();
size.Width = new Length(sizeF.Width, LengthUnits.Arbitrary);
size.Height = new Length(sizeF.Height, LengthUnits.Arbitrary);
return(size);
}