[cairo] pixman_format_create & PIXMAN_FORMAT_NAME_RG_B24

[Vladimir Vukicevic]

In pixman_format_create, this is created as:

         return pixman_format_create_masks (32,
                                     0x0,
                                     0xff0000,
                                     0x00ff00,
                                     0x0000ff);

should that 32 be a 24, or is RG_B24 data treated as always stored in 
32-bit values?  (Also, I'm curious, why the extra _ in ..._NAME_RG_B24 
and _NAME_AR_GB32? :)

Thanks,
	- Vlad