[Wayland-bugs] [Bug 101193] XWayland does not support scaling

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101193

Pekka Paalanen <ppaalanen at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |jadahl at gmail.com,
                   |                            |ppaalanen at gmail.com

--- Comment #1 from Pekka Paalanen <ppaalanen at gmail.com> ---
First, I don't think this is a Weston issue. Maybe this should be moved to
Xwayland instead?

As for the scaling protocol mentioned in the GNOME bug report, it does exist:
wl_viewport.

*If* Xwayland had some way of knowing that a Window should cover the whole
output but the size is not a match, it could use wl_viewport to let the Wayland
compositor do the scaling, which for a fullscreen game would hopefully
translate into scaling in display hardware rather than a GPU rendering pass.

But, I would also expect problems with input event coordinates if wl_viewport
is used naively.

Maybe Xwayland could support multiple resolutions via RandR by programming
wl_viewport to scale everything back to the native resolution? Setting a mode
via RandR would then be the trigger for switching the scaling settings in
Xwayland globally.

It does feel to me it could be pretty difficult, I don't really know Xwayland
that well.

As for Xwayland actually changing the real video modes on hardware, I'd rather
not have that. Let's not make X11 RandR a Wayland compositor configuration
interface. Likewise, 'xinput' is not a Wayland compositor configuration
interface either.

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