On Thu, 19 Sep 2019 10:18:04 +0200 Daniel Vetter <daniel.vetter@xxxxxxxx> wrote: > On Thu, Sep 19, 2019 at 9:18 AM Pekka Paalanen <ppaalanen@xxxxxxxxx> wrote: > > ... > > Right, and we are suffering from that confusion already. Should > > userspace use ID order if zpos property is not there or not? I have no > > idea. > > Nope. I think the only options for this case are: > - file bug against upstream driver so they add zpos > - you magically know how planes work on that hw > - you don't overlap planes at all > - cursor is above primary, that much we can guarantee > > Yes it's kinda uapi fail we didn't add zpos from the start :-/ Good. Weston does the last two. The confusion did not last long enough to let us add code using the object ID to infer stacking order. Although, Weston does have the assumption that overlays are in unknown order between primary and cursor, which now seems false. Thanks, pq
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