https://bugs.kde.org/show_bug.cgi?id=454942
Bug ID: 454942
Summary: Provide devicePixelRatio in KDecoration2
Product: kwin
Version: 5.24.90
Platform: Other
OS: Linux
Status: REPORTED
Severity: wishlist
Priority: NOR
Component: decorations
Assignee: kwin-bugs-n...@kde.org
Reporter: k...@paulmcauley.com
Target Milestone: ---
This is a feature request for an additional parameter in the KDecoration2 API.
Currently, in KDecoration you can only access devicePixelRatioF() (of the
current screen which the window exists) within the Decoration::paint method via
painter->device()->devicePixelRatioF().
However, in my own C++ window decoration I also paint some elements outside the
Decoration::paint method (for example, a window outline in the shadow, and a
separator under the titlebar). For these I would like access to
devicePixelRatioF() for more precise painting (e.g. with a cosmetic brush) and
alignment under Wayland.
Vlad Zahorodnii also mentioned this as a possibility in an old merge request at
https://invent.kde.org/plasma/breeze/-/merge_requests/75 :
"Vlad Zahorodnii @vladz ยท 1 year ago
Developer
KWin is the true source of device pixel ratio information. If such information
is needed, it can be added in KDecoration2 library, e.g. a devicePixelRatio
getter and a signal."
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