DEC_L ( ECX ) /* n -= 1 */
INC_L ( EBX ) /* mask += 1 */
ADD_L ( CONST(4), EDI ) /* rgba += 1 */
ADD_L ( CONST(4), ESI ) /* dest += 1 */
DEC_L ( ECX ) /* n -= 1 */
INC_L ( EBX ) /* mask += 1 */
ADD_L ( CONST(4), EDI ) /* rgba += 1 */
ADD_L ( CONST(4), ESI ) /* dest += 1 */