frame callbacks and sub_surfaces

[Michel Dänzer]

On 2022-11-07 10:27, Pekka Paalanen wrote:
> On Sat, 5 Nov 2022 16:14:44 -0700
> Joel Winarske <joel.winarske at gmail.com> wrote:
> 
>> Does the base surface ever get occluded?
> 
> Anything could be occluded or off-screen at any time.
> 
> However, if parent surface is completely occluded/off-screen, then that
> should not freeze any of its sub-surfaces that are visible, even if
> they are in synchronized mode. So I think the implication of that is
> that if any sub-surface is visible, then the parent surface should be
> reporting frame callbacks and do everything else as if it was visible
> too.
> 
> A good question, I wonder if anyone tests compositors for that...
> 
> I'm not sure if even Weston handles that correctly.
> 
> This is not explicitly mandated by the protocol specification IIRC, it's
> more about compositors doing what would look right to an end user.

There's https://gitlab.freedesktop.org/wayland/wayland/-/issues/266 about this.


-- 
Earthling Michel Dänzer            |                  https://redhat.com
Libre software enthusiast          |         Mesa and Xwayland developer