black surface in desktop shell fullscreen mode

[zou lan]

Hi Giulio

>>qtwayland uses wl_shell unless the user explicitly enables xdg_shell,
>>and right now hide() attachs a NULL buffer. Even in the xdg_shell
>>case, so that's broken.

Can qtwayland "hide"  implement the transparent window in desktop shell
fullscreen mode? I know it can work in normal mode.  Or Does it expects a
black screen in fullscreen mode?
The app developpers like use this function to swich multi apps.

Thank you.

Best Regards
Nancy



2015-10-08 16:33 GMT+08:00 Giulio Camuffo <giuliocamuffo at gmail.com>:

> 2015-10-08 9:59 GMT+03:00 Pekka Paalanen <ppaalanen at gmail.com>:
> > On Thu, 8 Oct 2015 11:12:42 +0800
> > zou lan <nancy.lan.zou at gmail.com> wrote:
> >
> >> >>If a client really wants to use the transparency, and does not want
> >> opaque black bars, it can be the client's responsibility to produce a
> >> buffer that can fill the screen.
> >>
> >> This is what the client wants to. The Qt app call "hide" function just
> >> wants to implement a function like minimize the window. But there is no
> >> minimize in fullscreen mode. I think maybe the qtwayland
> >> can implement the "hide" to make the window really transparent , not a
> >> black screen now.
> >
> > Hi,
> >
> > "hide" should be implemented by destroying the wl_surface and/or the
> > xdg_surface, in case committing a NULL wl_buffer is not allowed by the
> > xdg_shell spec.
> >
> > "Minimizing" is a very different operation, you would use
> > xdg_surface.set_minimized for that, and I don't think being fullscreen
> > prevents that in any way.
> >
> > Both of those do what you want: make the window disappear.
> >
> > Making a window completely transparent though is not something you
> > should try to do, and it won't make a fullscreen window disappear
> > guaranteed.
> >
> > So, my question stands: what does Qt do in Wayland terms for "hide"?
> > Is it using wl_shell or xdg_shell protocol?
>
> qtwayland uses wl_shell unless the user explicitly enables xdg_shell,
> and right now hide() attachs a NULL buffer. Even in the xdg_shell
> case, so that's broken.
>
>
> --
> Giulio
>
> >
> >
> > Thanks,
> > pq
>
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