https://bugs.kde.org/show_bug.cgi?id=462164
Bug ID: 462164
Summary: [x11] Window contents are blurry when restoring a
maximized window by dragging the title bar
Classification: Plasma
Product: kwin
Version: 5.26.3
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: compositing
Assignee: kwin-bugs-n...@kde.org
Reporter: marcus.gur...@gmail.com
Target Milestone: ---
Created attachment 153974
--> https://bugs.kde.org/attachment.cgi?id=153974&action=edit
Window content blur demonstration.
SUMMARY
***
As mentioned in the title, window contents become blurry when restoring a
maximized window by dragging the title bar. The amount of blur seems to vary
each time I try this but it happens basically every time I do it. This happens
only with compositing enabled. To me it seems like window coordinates are not
rounded to full pixels and due to this subpixel shift to the window coordinates
it appears blurry. E.g. when I screenshot only the blurred window with
spectacle, it appears sharp, but when I screenshot the whole desktop the blur
is visible.
***
STEPS TO REPRODUCE
See the attached video for a demonstration which also includes the steps to
reproduce. Please watch it at native 1920x1080 resolution without scaling to
better see the difference in sharpness.
OBSERVED RESULT
Window contents appear blurry.
EXPECTED RESULT
Window contents appear sharp with no additional blur added by the compositor.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch Linux / 5.26.3
(available in About System)
KDE Plasma Version: 5.26.3
KDE Frameworks Version: 5.100.0
Qt Version: 5.15.7+kde+r175-1
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