public static extern FtErrors FT_Get_Kerning(IntPtr face, UInt32 left_glyph, UInt32 right_glyph, UInt32 kern_mode, out FTVector26Dot6 akerning);
public static extern FtErrors FT_Glyph_To_Bitmap(ref IntPtr the_glyph, FontModes render_mode, ref FTVector26Dot6 origin, [MarshalAs(UnmanagedType.U1)] Boolean destroy);