https://bugs.kde.org/show_bug.cgi?id=482294
Bug ID: 482294
Summary: KWindowEffects::enableBlurBehind() region is no longer
relative to the top-left corner of the client area on
Plasma6 Wayland
Classification: Plasma
Product: kwin
Version: master
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: effects-various
Assignee: kwin-bugs-n...@kde.org
Reporter: k...@paulmcauley.com
Target Milestone: ---
Created attachment 166346
--> https://bugs.kde.org/attachment.cgi?id=166346&action=edit
Illustration on Plasma6 of BlurBehind not being applied to the client top-left
(scaling 100%)
I am in the middle of porting an Application Style from Plasma 5 to Plasma 6
(https://github.com/paulmcauley/klassy/tree/plasma6.0). In Plasma 5 my
Application Style could blur the tools area as in the screenshot at
https://github.com/paulmcauley/klassy/raw/plasma6.0/screenshots/button_icon_menu.png?raw=true
. This blur is applied by using the following function:
KWindowEffects::enableBlurBehind(mw->windowHandle(), true, rect);
(
https://github.com/paulmcauley/klassy/blob/861b93c30b6a0457427c488805a78f0ac770103d/kstyle/breezestyle.cpp#L1436
)
Note that I need to specify the rect parameter as a QRegion, which the API
documentation states "The region is relative to the top-left corner of the
client area". (
https://api.kde.org/frameworks/kwindowsystem/html/namespaceKWindowEffects.html#a23a8c1dd33fb9a4a9fa0bbde4ae830cb
)
My problem is that on Plasma 6 Wayland the blurred region is not in the correct
position, and looks like the attached screenshot. Looking at debug output, the
height of the region is specified in this instance as 46 pixels, but the actual
blurred height in the client is smaller. The unblurred gap is equivalent to the
titlebar height, with the blurred region now 46 pixels from the top of the
decoration, suggesting that the BlurBehind effect region is now relative to the
decoration top-left rather than the client top-left. (Note that on Plasma 6 X11
this problem does not occur, it only is a problem on Wayland).
Note also that this bug also applies to the style of both Qt5 apps (linked to
KF5 version of KWindowSystem as in the Dolphin screenshot) and Qt6 apps (linked
to KF6 version of KWindowSystem) hence I suspect it may be a wider problem than
just in KWindowSystem.
Operating System: openSUSE Tumbleweed 20240227
KDE Plasma Version: 6.0.80
KDE Frameworks Version: 6.0.0
Qt Version: 6.6.2
Kernel Version: 6.7.6-1-default (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-8550U CPU @ 1.80GHz
Memory: 15.5 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 620
Manufacturer: Google
Product Name: Pantheon
System Version: 1.0
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