https://bugs.kde.org/show_bug.cgi?id=460840
Bug ID: 460840
Summary: KWin doesn't respect sub-pixel rendering setting for
window titles
Classification: Plasma
Product: kwin
Version: 5.26.0
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: decorations
Assignee: kwin-bugs-n...@kde.org
Reporter: adam.m.fontenot+...@gmail.com
Target Milestone: ---
SUMMARY
I have RGB sub-pixel rendering enabled. It works as expected everywhere inside
KDE / QT applications, but window titles are rendered with only grayscale
anti-aliasing.
>From what I can tell looking at some old screenshots, the issue first appeared
sometime in 2018 or 2019.
I think this probably affects anywhere that KWin draws text, but I'm not sure
where that is besides the window title, so I can't verify. Text drawn as part
in Plasma (e.g. in the task bar) respects the rendering settings.
STEPS TO REPRODUCE
1. Enable RGB sub-pixel rendering for fonts in your system settings. (I also
have anti-aliasing enabled and hinting disabled, although this shouldn't
matter.)
2. Restart KWin and see if window titles are subpixel rendered. (If you take a
screenshot and zoom in close, you should see color fringing around the glyphs.)
OBSERVED RESULT
Window titles are not subpixel rendered.
EXPECTED RESULT
They should be.
SOFTWARE/OS VERSIONS
Operating System: Arch Linux
KDE Plasma Version: 5.26.0
KDE Frameworks Version: 5.99.0
Qt Version: 5.15.6
Kernel Version: 6.0.1-arch1-1 (64-bit)
Graphics Platform: X11
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