https://bugs.kde.org/show_bug.cgi?id=486626
Bug ID: 486626
Summary: The 'Wobbly Windows' effect makes windows blurry if
fractional scaling is used
Classification: Plasma
Product: kwin
Version: git master
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: effects-various
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
Hi! I've fallen in love with the 'Wobbly Windows' effect. It transforms
interactions with windows into something more connected with the user - instead
of windows being simple rectangles that just immediately jump to wherever you
want them to be, they become almost physical objects that you feel like you can
touch.
However, I've encountered a slight problem with it. Windows affected by this
effect become blurry when I use fractional scaling (I typically use 125%, as
anything lower is too small, and anything higher is too big). The end result is
very similar to the blurry X11 windows seen when using `Legacy applications
(X11): Scaled by the system`. However, this affects both Wayland and X11 apps,
leading me to assume that the effect is applied before the window has a chance
to be properly scaled. Consequently, the entire window is upscaled only after
its geometry has been changed, resulting in blurriness.
STEPS TO REPRODUCE
1. Enable the 'Wobbly Windows' effect in 'Window Management' -> 'Desktop
Effects' -> 'Wobbly Windows'
2. Enable fractional scaling in 'Display & Monitor' -> 'Display Configuration'
-> 'Scale' (use values like 125%, 150%, 175%, etc.)
3. Try to move any window to activate the effect.
OBSERVED RESULT
Whenever a window is moved (i.e., when the effect is applied to it), it becomes
blurry. Which also happens even if you hold the window with your mouse
perfectly still (so that its geometry doesn't change and it remains a plain old
rectangle).
EXPECTED RESULT
A window should remain sharp and clear, just as it does when no scaling is
applied.
SOFTWARE/OS VERSIONS
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
Kernel Version: 6.8.7-300.fc40.x86_64 (64-bit)
Graphics Platform: Wayland
ADDITIONAL INFORMATION
This bug report appears to be an almost exact duplicate of 461283, which was
presumably fixed by
https://invent.kde.org/plasma/kwin/-/commit/19970bd63981504bad7fde626644f487b9cf7abc.
However, it seems that some users experienced this problem even without scaling
being applied, which is not the case for me - at 100%, windows remain perfectly
crisp as they should. So, I believe this issue is different (especially
considering the fact that I still can observe it after it's been fixed) and it
somehow stems from the fact that I use fractional scaling.
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