[cairo] Global glyph cache

Chris Wilson chris at chris-wilson.co.uk
Fri Nov 21 12:12:22 PST 2008

Whilst playing with Behdad's recent cairo backend for vte, I noticed
that it allocated many small glyphs, and if we stressed the font cache
by dumping random data to the terminal, it would frequently reallocate
those glyphs. In order to mitigate this I experimented with a global
glyph cache which I present the first draft for review and suggestions.
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