fb: Add RGB888 format

The RGB888 format is the one used as the shadow buffer used when a cairo
surface is requested for a format that Cairo cannot handle.

Since we're going to move that buffer representation to a struct igt_fb,
let's add the RGB888 format to the list of formats that igt_fb knows about.

Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Arkadiusz Hiler <arkadiusz.hiler@intel.com>
1 file changed