https://bugs.kde.org/show_bug.cgi?id=444244
Bug ID: 444244
Summary: Modifications required in how kwin applies blur in
wayland
Product: kwin
Version: unspecified
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: effects-various
Assignee: kwin-bugs-n...@kde.org
Reporter: sk.griffi...@gmail.com
Target Milestone: ---
SUMMARY
As of now, enabling blur effect in system settings blurs menus, kvantum
windows, window decorations etc, but does not blur any non-kde window's
transparent elements. I guess it is because the application or element has to
specially request blur effect to be applied by kwin? This approach is
dissimilar to compositors like picom and wayfire, that blur all transparent
elements in all applications.
Now this problem was easily solvable in x11 where one could just use the force
blur script to define applications to blur. This is not perfect as some
transparent elements still do not get affected by the script, like the close
dialogue box of firefox, but it works for most cases.
In case of wayland however, no solution seems possible as of now. I doubt a
solution would be even possible without being significantly integrated into
kwin. As of now, the only workaround to get blur in non-kde apps in plasma
wayland is to run them via xwayland, and then use force blur script for them.
This is not remotely close to ideal and not something that will be
future-proofed for long.
My opinion is that plasma should apply blur effect similarly to wayfire, or
provide a method in the effect itself to include/exclude windows. If it is
possible in wayfire without loss in performance or apparent smoothness, it
should be possible in kwin too.
STEPS TO REPRODUCE
1. Install any non-kde app with transparent elements (like alacritty, set value
of background_opacity: 0.70 in .yaml file)
2. Run the program in plasma wayland not through xwayland
OBSERVED RESULT
No blur effect
EXPECTED RESULT
Blur should be applied, or a method to apply blur should exist
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