https://bugs.kde.org/show_bug.cgi?id=485822
Bug ID: 485822
Summary: Blur effect is rendered incorrectly on lower blur
strengths
Classification: Plasma
Product: kwin
Version: 6.0.4
Platform: Arch Linux
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: effects-various
Assignee: kwin-bugs-n...@kde.org
Reporter: wackyid...@disroot.org
Target Milestone: ---
Created attachment 168699
--> https://bugs.kde.org/attachment.cgi?id=168699&action=edit
Comparison of the blur effect between KDE 5.27.10 and KDE 6.0.4
SUMMARY
Starting with KDE Plasma 6, the blur effect has noticeable artifacts when
rendering at lower blur strengths, which did not happen before in KDE Plasma 5.
They're best seen when using a transparent and blurred window decoration theme,
such as "Blur-Glassy-Aurorae-6".
These artifacts are present when setting the blur strength to either 0 or 1,
and the artifacts differ depending on the blur strength as well. When set to 0,
if a blurred window is moved around, the blur appears to jitter and appear
blocky. When set to 1, detailed UI elements such as icons and especially text
get blurred strangely.
STEPS TO REPRODUCE
1. Apply a transparent window decoration theme such as "Blur-Glassy-Aurorae-6".
2. Enable blur.
3. Set blur strength to 0 or 1.
4. Move the window behind some medium to large text, and/or begin moving the
window around.
OBSERVED RESULT
Blur gets rendered incorrectly with artifacts. Moving the window around
produces jitter on the lowest blur strength, while when strength is set to 1,
blur is rendered in a strange manner, e.g black text suddenly looks like white
text with a drop shadow. See the attachments
EXPECTED RESULT
Blur gets rendered correctly, without any jitters or strange artifacts.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux
KDE Plasma Version: 6.0.4
KDE Frameworks Version: 6.1.0
Qt Version: 6.7.0
ADDITIONAL INFORMATION
This has been reproduced on Intel integrated graphics and on a VMWare virtual
machine, both on X11 and Wayland, all producing the same results, implying that
this seems to be an error in the implementation of the blur effect rather than
a hardware specific issue.
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