Simon Ser

This doesn't work on i915. 8a971695bd3d ("test: introduce liftoff_mock_require_primary_plane") makes sure we catch this in the tests.

New failing test, needs a fix.

Have a layer that can be scanned out, and an invisible layer on top (`CRTC_*` describe a non-empty rectangle, but either the layer is disabled via `FB_ID = 0` either...

Library doesn't get page-flip notifications

1

The library has no way to figure out whether a page-flip happened. This is necessary for tracking the priority of each layer (at least as we do now, a time-based...

Integrate with an existing compositor

1

After https://github.com/emersion/libliftoff/issues/25, the next step would be to start using libliftoff in a real compositor. Options are: - Weston: probably the easiest way to do it - wlroots: the backend...

Composition on a non-primary plane

1

In some cases, it may be a good idea to perform composition on an overlay plane. Do we want to support this at all? How should the API look like?...

Prune layers outside of the viewport

1

Requires to know what the viewport is. Could figure out with `drmModeGetCrtc`.

Underlay support

1

Support overlay planes under the primary plane. For instance, we could have a video player drawing subtitles on the primary plane and scanning out a video on an underlay plane.

Plane allocation is an NP-complete problem, so worst case scenario we'll try all potential solutions. However we could try them from most likely to less likely with an heuristic, to...

Incremental CRTC_* property changes

2

Leftover from https://github.com/emersion/libliftoff/issues/6#issuecomment-541075601. If only CRTC_{X,Y,W,H} changes and the intersection between layers doesn't, we can re-use the previous alloc. Note, on some Intel platforms sometimes putting a layer into a...