frame callbacks and sub_surfaces

[Pekka Paalanen]

On Mon, 31 Oct 2022 10:14:42 -0700
Joel Winarske <joel.winarske at gmail.com> wrote:

> Thank you for the enlightenment!
> 
> Adding the ordered commit calls was the missing link.
> 
> Do the commit calls need to happen based on the active Z-order, or based on
> the order of surface creation?

They need to be ordered by sub-surface relationships, i.e. what is the
parent surface for a sub-surface.

Z-order is completely irrelevant here. Also wl_surface creation order
is irrelevant. What is relevant is what you set as the parent
wl_surface in wl_subcompositor.get_subsurface request.

You can create a sub-surface tree in any order by creating the
wl_subsurface objects in any order. The relevant thing is the final
parent surface <-> sub-surface association graph (actually a tree) when
you start doing updates (commits) to the wl_surfaces.


Thanks,
pq
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