[Interest] Qt Wayland: handle one or two displays like Weston does

[Lisandro Damián Nicanor Pérez Meyer]

Hi Shawn!

On Tue, 23 May 2023 at 18:21, Shawn Rutledge via Interest
<interest at qt-project.org> wrote:
>
>
> > On 19 May 2023, at 16:02, Lisandro Damián Nicanor Pérez Meyer <perezmeyer at gmail.com> wrote:
> >
> > Hi!
> >
> > Is there any example of QtWayland's compositor handling one or two monitors like Weston does?
> >
> > To be more precise: my hardware, iMX8M-PLUS based, has an LVDS display and an HDMI output.
> >
> > The LVDS display is always connected, and if weston is started it will set the shell to be as big as the LVDS display itself.
> >
> > Now if an HDMI monitor gets attached Weston will expand the shell to the right with the new display's size...
>
> As far as I know, we have not yet implemented display hotplugging.  The main use case so far for QtWayland compositors is embedded: you might have multiple screens on one GPU in your car, but they are fixed and configured at the factory.  I would also like to have hotplugging in eglfs though, because it’s one of the obstacles in the way of using QtWayland on laptops and such (don’t want to have to restart the compositor if I connect a second monitor); but I think this involves more work with libdrm to achieve.  (I've spoken to colleagues about it a few years ago, so I’m just remembering what was said at the time, but didn’t get around to trying to implement it.)

Thanks for the reply! Well, turns out this is for an embedded device:
a device in which a user could plug a monitor and get either the
screen mirrored or a new window with some more content :-/

So basically I should try to make the Weston IVI shell work, at least
for the moment. I'm talking about IVI here because one can position
the window programmatically, not because of cars :-)

If you ever get to try to implement it, ping me and I'll test it ;-)


-- 
Lisandro Damián Nicanor Pérez Meyer
https://perezmeyer.com.ar/