This uses a sealed anonymous file (memfd) instead of a `QTemporaryFile`,
which is more efficient.
Signed-off-by: Victoria Fischer <victoria.fischer@mbition.io>
At the moment, dmabuf importing is scattered all over the place in kwin.
It would be great if we had one function that takes dma-buf attributes
and returns an EGLImage if successful.
As the first step, make linux-dmabuf-v1 implementation provide dmabuf
attrs compatible with KWin::DmaBufAttributes.
dmabuf-feedback allows the compositor to give the client feedback on what
formats and modifiers are best to use, and for which devices it needs to
allocate its buffers, which improves performance and efficiency.
