[Freetype] Font & Glyph caching

[Eric Poulsen]

I'm developing an application that only (currently) needs to do metrics
on fonts for layout purposes.  The app will not be rendering any text
directly.

I've written a class to cache fonts (load on demand), then I use 
FT_Load_Glyph( face, glyph_index, FT_LOAD_DEFAULT ) to load a glyph, and
measure it.

My question: Do I need to glyph caching if I'm not rendering the
glyphs?