return FcPatternEqual (a->pattern, b->pattern);
return strcmp (a->filename, b->filename) == 0 && a->id == b->id;
_ft_font_cache_keys_equal (void *cache,			   void *k1,			   void *k2){    cairo_ft_cache_key_t *a;    cairo_ft_cache_key_t *b;    a = (cairo_ft_cache_key_t *) k1;    b = (cairo_ft_cache_key_t *) k2;        return FcPatternEqual (a->pattern, b->pattern);}