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DMA-Buf Screencast

Georges Basile Stavracas Neto requested to merge gbsneto/dmabuf-screencast into master

This series of commits implement DMA-Buf sharing on top of PipeWire 0.3 new API.

The framebuffers are all created in one go; during the stream, they're recycled, and we blit the current onscreen framebuffer into the shared one; at last, when the stream is closed, all the framebuffers are deleted.

The result is, as expected, massive: with this MR applied, Mutter / GNOME Shell consumes almost no extra CPU beyond what it consumes regularly.

Edited by Georges Basile Stavracas Neto

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