https://bugs.kde.org/show_bug.cgi?id=453229
Bug ID: 453229
Summary: New setBlurRegion() API gives blocky/aliased blur
region corners on Wayland
Product: kwin
Version: git master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: decorations
Assignee: kwin-bugs-n...@kde.org
Reporter: k...@paulmcauley.com
Target Milestone: ---
Created attachment 148474
--> https://bugs.kde.org/attachment.cgi?id=148474&action=edit
Screenshot of ClassiK window decoration with 20% opacity titlebars/borders and
blur on, corner radius=4, shadows disabled to emphasise bug. The corners
exhibit very blocky aliasing.
Hello, I have made a first attempt at implementing the new setBlurRegion() API
(due to land in Plasma 5.25) in my C++ Window Decoration. This can be found on
the branch at:
https://github.com/paulmcauley/classik/tree/kornerbug-fix-plasma5.25
I construct my window shape using a QPainterPath (called m_windowPath) and then
call setBlurRegion as follows:
setBlurRegion( QRegion( m_windowPath->toFillPolygon().toPolygon() ) ) ;
The results on X11 are excellent and produces very smooth corners when
transparency and blur are enabled. However, on Wayland, the corners of the blur
region are very blocky/aliased in appearance.
Operating System: openSUSE Tumbleweed 20220421
KDE Plasma Version: 5.24.80
KDE Frameworks Version: 5.94.0
Qt Version: 5.15.2
Kernel Version: 5.17.3-1-default (64-bit)
Graphics Platform: X11
Processors: 8 × Intel® Core™ i7-7700HQ CPU @ 2.80GHz
Memory: 31.2 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 630
Manufacturer: Dell Inc.
Product Name: XPS 15 9560
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