[Freetype] Augmenting a Font

[Allen Barnett]

Hi,

I've got an application where I'd like to synthesize several glyphs and 
add them to an existing face. Specifically, I'd like to make some fractions 
out of the numerals already in a font (selected by the user, so I don't know 
what font it is beforehand). They would have a private encoding in the 
UNICODE F0000 range and some appropriate metrics. Then my rendering code can 
just refer to UF0xxx and I can compute the layout of these glyphs easily.

FreeType2's API doesn't describe a way to augment a face. Is there a 
straight-forward way to accomplish this?

Thanks,
Allen