On Tue, Aug 10, 2021 at 05:57:31PM +0100, John Cox wrote: > Hi all > > I am on a Raspberry Pi, I want to display fullscreen video and have a > couple of overlay planes to display controls / subtitles etc. The h/w > can certainly do this. I need to be able to do this from a starting > point where X is running. > > I can successfully find X's output & crtc and grab that using > xcb_randr_create_lease and use that handle to display video. So far so > good. But I also want to have overlay planes for subtitles etc. The > handle I've got from the lease only seems to have a PRIMARY & a CURSOR > plane attached so I can't get anything there. I think X just gives you a legacy lease for the crtc, and the kernel automatically adds the primary plane and cursor plane (if they exist) to that lease. Unless X is patched to enable plane support and add those all explicitly to the lease I don't think there's a way for that. For wayland this is still in the works, so might be good if you check there that your use-case is properly supported. Protocol MR is here: https://gitlab.freedesktop.org/wayland/wayland-protocols/-/merge_requests/67 > How should I be going about getting some more planes to use for > overlays? Pointers to documentation / examples gratefully received - so > far my google-foo has failed to find anything that works. > > I'm sorry if this is the wrong place to ask, but if there is a better > place please say and I'll go there. > > Many thanks > > John Cox -- Daniel Vetter Software Engineer, Intel Corporation http://blog.ffwll.ch
