avdevice/xcbgrab: wrap non-shm image replies in a buffer ref
This avoids a memcpy improving performance if SHM is not used.
Signed-off-by: NMarton Balint <cus@passwd.hu>
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This avoids a memcpy improving performance if SHM is not used.
Signed-off-by: NMarton Balint <cus@passwd.hu>