On Friday, May 31st, 2024 at 16:45, Simon Ser <cont...@emersion.fr> wrote:
> > See: > > https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/124 > > > > > My goal is to implement this screen capture with a guarantee that the > > > copy comes from a KMS writeback connector. I know this sounds like an odd > > > thing to insist on. Let's say that in my industry, the system is rarely > > > only running Linux directly on the bare metal. Using the writeback > > > hardware on the display controller allows to get a copy of content from > > > all the virtual machines in the system. > > > > Although the protocol is called "screencopy", it does not need to be > > implemented via copying. I don't think anything precludes drm > > write-back or rendering directly to the client-submitted buffers. > > Not sure that's true… With screencopy the client necessarily provides > buffers that the compositor copies into. Correction: Andri said that it should be possible to pass client-allocated buffers to the writeback connector. There might be allocation considerations to take care of, but it might work fine indeed.
