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

[Igor Korot]

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