I would reuse PIXMAN_FORMAT for these values. No reason to come up with
yet another enumeration. Though it means the current wl_shm values have
to change, except it looks like 0 and 1 (and in fact any number less
than 0x1000000) don't make any logical PIXMAN_FORMAT values so maybe
they can be special-cased?
#define PIXMAN_FORMAT(bpp,type,a,r,g,b) (((bpp) << 24) | \
((type) << 16) | \
((a) << 12) | \
((r) << 8) | \
((g) << 4) | \
((b)))
#define PIXMAN_TYPE_OTHER 0
#define PIXMAN_TYPE_A 1
#define PIXMAN_TYPE_ARGB 2
#define PIXMAN_TYPE_ABGR 3
#define PIXMAN_TYPE_COLOR 4
#define PIXMAN_TYPE_GRAY 5
#define PIXMAN_TYPE_YUY2 6
#define PIXMAN_TYPE_YV12 7
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