PeachDrawing.Text
PeachDrawing.Text.Export.ExportedFont
ExportedFont.IsSubset Property
Whether the font holds only the glyphs that were asked for. It does not when the face’s outlines are CFF (a CFF
table), which the exporter cannot cut down and so hands over whole. A face with CFF2 outlines is written afresh, and does.
public bool IsSubset { get; }