https://bugs.kde.org/show_bug.cgi?id=469830
Bug ID: 469830
Summary: High-DPI Fractional Scaling nonfunctional on KDE
Plasma + Wayland
Classification: Applications
Product: krita
Version: git master (please specify the git hash!)
Platform: Archlinux
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: Usability
Assignee: krita-bugs-n...@kde.org
Reporter: swiftlo...@gmail.com
Target Milestone: ---
SUMMARY
***
On both 5.15 and the latest master (tested with aab9b91) the "fractional
scaling" option is greyed out
([image](https://krita-artists.org/uploads/default/original/3X/9/4/943835869578160c9976a19f37da420dd628b2ce.png)).
This causes Kritas UI to appear unusable on KDE Plasma Wayland with fractional
scaling (I use 235% scaling on a 14" 4K screen)
([image](https://krita-artists.org/uploads/default/original/3X/6/4/64d66ec8a51f08095f6717e24b85e8a00aa1714e.png)).
I did some digging through the source code to figure out what's going on. On
5.15, the fractional scaling option is not present at all, but a [recent
change](https://invent.kde.org/graphics/krita/-/commit/c59a6ce21e6a60fd351386b024c90c80b52146f6)
makes it so that the option is now present, but greyed out. This is a welcome
change, making it more clear that the option is not available, but doesn't fix
the problem.
The option is gated behind ``#ifdef``s with
[this](https://invent.kde.org/graphics/krita/-/blob/master/CMakeLists.txt#L472)
CMake test. One can see that the option is gated behind this in the commit I
show above, and the actual enabling of fractional scaling is [similarly
gated](https://invent.kde.org/graphics/krita/-/blob/c59a6ce21e6a60fd351386b024c90c80b52146f6/krita/main.cc#L255)
in main.cc.
CMake reports that this test passes on my local build:
```
-- Performing Test HAVE_HIGH_DPI_SCALE_FACTOR_ROUNDING_POLICY
-- Performing Test HAVE_HIGH_DPI_SCALE_FACTOR_ROUNDING_POLICY - Success
```
However, the option still is greyed out and does not function.
After digging that far into this, the folks on IRC suggested I file a bug
report here, to which I am obliging. I have some extra time this week, so I'm
happy to help wherever possible.
***
STEPS TO REPRODUCE
1. Boot Krita on KDE Plasma Wayland with fractional scaling enabled.
2. Attempt to enable fractional scaling in Settings -> Configure Krita ->
Window
OBSERVED RESULT
Fractional scaling should be an available option, and should work as intended.
EXPECTED RESULT
Fractional scaling option is greyed out and cannot be enabled
SOFTWARE/OS VERSIONS
Linux/KDE Plasma:
(available in About System)
KDE Plasma Version: 5.27.5
KDE Frameworks Version: 5.105.0
Qt Version: 5.15.9
ADDITIONAL INFORMATION
Graphics Platform: Wayland
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