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Certain devices give black frames when blitting to the target texture for image preview. However, a workaround has been found that simply mapping the buffer forces the frames to be rendered properly. As this degrades performance on devices with hardware buffers, a blacklist is introduced to specify which devices require this workaround. Task-number: QTBUG-44838 Change-Id: I137a1dc4e5126e7cf9ee00cb2d7e7722bf917efa Reviewed-by: Andrew Knight <qt@panimo.net>