[PATCH 0/1] MR5979: mfreadwrite: Use GPU copy when available.

[Brendan McGrath (＠redmcg)]

If both buffers are DXGI buffers, they can be copied on the GPU. They
are currently transferred to the CPU, copied by the CPU and then
transferred back to the GPU.

Performing a GPU copy produces ~25% faster playback on 4K video.

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https://gitlab.winehq.org/wine/wine/-/merge_requests/5979