[PATCH weston] Fullscreen surfaces

Emilio Pozuelo Monfort pochu27 at gmail.com
Mon Feb 3 23:45:22 PST 2014

On 03/02/14 17:14, Emilio Pozuelo Monfort wrote:
> Hi Bill,
> On 30/01/14 23:33, Bill Spitzak wrote:
>> There really should not be a "fullscreen layer" which is what is causing this
>> problem. "layers" are imho a mistake except for the desttop and the mouse cursor.
>> What I think needs to happen:
>> Fullscreen, normal windows, and "panels" can be arranged in any stacking order,
>> except the compositor enforces this rule:
>> The "panels" are always just below the lowest fullscreen window. If there are no
>> fullscreen windows then the panel is above all windows.
>> There are several ways to enforce this but one that matches current window apis is:
>> 1. When a window is "raised" and there are no fullscreen windows, the panels are
>> also raised to remain above it. If there are fullscreen windows then the panel
>> is not moved. Note that a window can be raised above a fullscreen window, thus
>> solving this bug.
>> 2. Whan a window switches to fullscreen it is also raised (thus it will end up
>> above the panel). (an alternative is to lower the panel but that is not standard
>> behavior in existing windowing systems).
>> 3. When the last fullscreen window switches to non-fullscreen, the panel is
>> raised above all windows.
> I think this could work well. It would indeed solve
> https://bugs.freedesktop.org/show_bug.cgi?id=74219. I just disagree with one
> detail: the panel should always be on top except when the top surface is
> fullscreened. So if there are two surfaces, a normal surface above and a
> fullscreen surface behind it, then the panel should be raised (that would be
> consistent with what we currently do and with what gnome-shell does).

I talked to Jasper on irc and he said mutter keeps a normal layer and a
fullscreen layer, and adds an extra layer where the focused window is placed and
which is drawn above the other layers. That would solve #74219 as well. However
this made me think we can solve #74219 easily without adding an extra layer or
removing the fullscreen layer. We just need to raise a surface to the top
whenever it is focused, including lowering the fullscreen layer if that isn't empty.

I'll try to look at this later this week if I can find some time.


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