GdipAddPathStringI(GpPath path, string text, int length, GpFontFamily family, int style, float emSize, GpRect layoutRect, GpStringFormat format);
public static extern GpStatus GdipCreateFont(GpFontFamily fontFamily, float emSize, FontStyle style, Unit unit, out GpFont font);
public static extern GpStatus GdipCreateFontFamilyFromName(string name, GpFontCollection fontCollection, out GpFontFamily fontFamily);
public static extern GpStatus GdipDeleteFontFamily(GpFontFamily fontFamily);
public static extern GpStatus GdipAddPathString(GpPath path, string str, int length, GpFontFamily family, int style, float emSize, GpRectF layoutRect, GpStringFormat format);