https://bugs.kde.org/show_bug.cgi?id=513518

            Bug ID: 513518
           Summary: KDecoration3::BorderOutline changes the set outline
                    colour
    Classification: Plasma
           Product: kwin
      Version First 6.5.3
       Reported In:
          Platform: openSUSE
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: decorations
          Assignee: [email protected]
          Reporter: [email protected]
  Target Milestone: ---

Created attachment 187760
  --> https://bugs.kde.org/attachment.cgi?id=187760&action=edit
Expected outline colours (window outlines drawn as part of the shadow)

Hello,

I am the author of a C++ window decoration. I have just ported it to use
KDecoration3::BorderOutline as newly available in Plasma 6.5 (source code of my
port is at https://github.com/paulmcauley/klassy/tree/BorderOutlinePort ). My
window outlines were previously implemented as part of the shadow, but I want
to use the new BorderOutline API as it has better positioning and probably is
more efficient.

My problem is that the outline colour drawn by KDecoration3::BorderOutline is
not the same as the colour which I set when I call
KDecoration3::setBorderOutline(). The displayed outline colour is much brighter
and this can make the outline look too gaudy and distracting, especially with
dark colour schemes. The difference can be seen in the attached screenshots.


Operating System: openSUSE Tumbleweed-Slowroll 20251204
KDE Plasma Version: 6.5.3
KDE Frameworks Version: 6.20.0
Qt Version: 6.10.1
Kernel Version: 6.18.0-1.0.2.sr20251204-default (64-bit)
Graphics Platform: Wayland
Processors: 8 × Intel® Core™ i7-7700HQ CPU @ 2.80GHz
Memory: 32 GiB of RAM (31.2 GiB usable)
Graphics Processor: Intel® HD Graphics 630
Manufacturer: Dell Inc.
Product Name: XPS 15 9560

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