PeachDrawing.Core
PeachDrawing.Core.TypefaceFont
TypefaceFont.FontUnitsPerEm Property
This font’s design-units-per-em (e.g. 1000 or 2048) - MathTable’s
design-unit values need scaling by Size / FontUnitsPerEm to become points. 0 when
this font has no MathTable (nothing to scale).
public override double FontUnitsPerEm { get; }