Need support to display application at (0, 0) position on Weston desktop

[huy nguyen]

Hi Igor,

I do not have a full context about Wayland protocol vs X11 legacy faults to
understand the reason why the Wayland devs do not support absolute position
decided by client applications.
Fortunately, I can modify the weston desktop shell to provide that support
to my particular use-case with my local build so that I can live with that
until an official support from Wayland in the future.

Best regards,
Huy

On Thu, Jul 13, 2023 at 10:29 PM Igor Korot <ikorot01 at gmail.com> wrote:

> Hi,
> I believe with any Wayland stuff you will fail to use absolute positioning.
>
> you absolutely have to use X11 and forget about Wayland..
>
> The Wayland devs are NOT CONVINCED enough to support absolute
> positioning and will just tell you to use X11.
>
> THank you.
>
> On Thu, Jul 13, 2023 at 9:55 AM huy nguyen <huykhacnguyen1983 at gmail.com>
> wrote:
> >
> > Hi Pekka,
> >
> > Thank you for your helpful feedback.
> > I understand all your points and will take a look to provide a custom
> logic to weston desktop to support my use-cases.
> >
> > Best regards,
> > Huy
> >
> > On Thu, Jul 13, 2023 at 5:07 PM Pekka Paalanen <ppaalanen at gmail.com>
> wrote:
> >>
> >> On Wed, 12 Jul 2023 21:38:06 +0700
> >> huy nguyen <huykhacnguyen1983 at gmail.com> wrote:
> >>
> >> > Hi all,
> >> >
> >> > I have a Linux system based on weston wayland. I run MPV player and
> expect
> >> > it displays a video window at (0,0) position on the screen (top left
> corner
> >> > of the display). I already use x11egl backend option to MPV to
> support a
> >> > fixed position to application but the video window of MPV is
> displayed at
> >> > an offset (X offset, Y offset) from (0,0) position as shown by the
> picture
> >> > below:
> >> >
> >> > [image: IMG_6944.jpg]
> >> >
> >> > Can we have a support from weston wayland to position (0,0)  to
> application
> >> > running on Xwayland backend?
> >>
> >> Hi,
> >>
> >> I think the gap you see is the window decorations. Weston's X11 Window
> >> Manager (XWM) and demo clients have a fairly wide margin around window
> >> decorations. So the window actually is at (0, 0) already, and the gap
> >> is really just the decorations.
> >>
> >> Maybe you can tell mpv to tell XWM to not decorate the window at all,
> >> or maybe you can make the position slightly negative to close the gap.
> >>
> >> However, if this is a not general use desktop, and kiosk-shell does not
> >> fit, the I'm afraid the only reliable way to get exactly the window
> >> management behaviour you want overall is to fork and modify Weston's
> >> desktop-shell plugin. I mean, maybe you would also like the video
> >> window to stay on top regardless of where the user is touching/clicking.
> >>
> >> Composing an application from multiple independent programs like video
> >> players necessarily requires the window manager to be part of the
> >> application. As window managers are built into Wayland compositors, you
> >> have to change the compositor. In Weston case that happens by loading
> >> a different "shell" plugin.
> >>
> >> Usually if you want an application to embed a video player, you do that
> >> with video playing libraries inside the application, and not by adding
> >> an external video player which then requires careful window management.
> >>
> >>
> >> Thanks,
> >> pq
>
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