[Freetype] Caching glyph metrics

[Michael Day]

Hi,

Does anyone have some sample code to subclass FT_Glyph_Cache to cache
glyph metrics? It should be possible to create a metrics cache by changing
FT_ImageCache, but this is not very easy when you are still trying to
understand the caching mechanism.

Would it be possible to create a cache that stores glyph specific data
derived by a function passed in at cache creation time, perhaps? That way
it might be possible to implement image and metric caches sharing the same
code?

Michael