Stacking subsurface siblings

[Arnaud Vrac]

It's possible, but the OSD is usually longer lived than the video surfaces,
which might be transient. For example in an HTML browser, a declarative UI,
etc, multiple video surfaces could be created for some pages and then
destroyed when the page is closed.

On Tue, Jun 16, 2015 at 5:11 PM, Jasper St. Pierre <jstpierre at mecheye.net>
wrote:

> Why can't you use the video as the main surface and an OSD as a subsurface?
>
> On Tue, Jun 16, 2015 at 11:09 AM, Arnaud Vrac <rawoul at gmail.com> wrote:
> > I'm not sure, but I find it very useful for a video player. The video is
> > stacked under the OSD and to be able to use hardware planes, the only
> viable
> > option with wayland is to have a surface for the OSD and a subsurface for
> > the video which is stacked under.
> >
> > On Tue, Jun 16, 2015 at 5:02 PM, Jasper St. Pierre <
> jstpierre at mecheye.net>
> > wrote:
> >>
> >> I was not aware you could stack subsurfaces under a parent surface at
> >> all. Is this intended protocol behavior? The fact that you might be
> >> able to do that at all in Weston might be a bug.
> >>
> >> On Tue, Jun 16, 2015 at 7:46 AM, Arnaud Vrac <rawoul at gmail.com> wrote:
> >> > Hi,
> >> >
> >> > I'm wondering if a behaviour of weston related to subsurfaces is
> either
> >> > a
> >> > bug or intended. The protocol description is not clear on what happens
> >> > in
> >> > the following cases:
> >> >
> >> > Suppose I have a shell surface (BLUE) and two subsurfaces (RED,
> GREEN).
> >> > I
> >> > want to stack them to I get RED, GREEN, BLUE from bottom to top.
> >> >
> >> > If I do:
> >> >
> >> > wl_subsurface_place_below(GREEN->subsurface, BLUE->surface);
> >> > wl_subsurface_place_below(RED->subsurface, GREEN->surface);
> >> >
> >> > It works, but if I do:
> >> >
> >> > wl_subsurface_place_below(RED->subsurface, GREEN->surface);
> >> > wl_subsurface_place_below(GREEN->subsurface, BLUE->surface);
> >> >
> >> > The order is GREEN, RED, BLUE instead.
> >> >
> >> > Logically the sibling relative order should be kept in the second
> case,
> >> > but
> >> > it's not. The protocol is not clear on what should happen, what is the
> >> > expected result ?
> >> >
> >> > I have attached a small sample to test easily.
> >> >
> >> > --
> >> > Arnaud
> >> >
> >> > _______________________________________________
> >> > wayland-devel mailing list
> >> > wayland-devel at lists.freedesktop.org
> >> > http://lists.freedesktop.org/mailman/listinfo/wayland-devel
> >> >
> >>
> >>
> >>
> >> --
> >>   Jasper
> >
> >
> >
> >
> > --
> > Arnaud Vrac
>
>
>
> --
>   Jasper
>



-- 
Arnaud Vrac
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