https://bugs.kde.org/show_bug.cgi?id=445564
Bug ID: 445564
Summary: With HiDPI scaling, rotating canvas back and forth
cause offset of viewport.
Product: krita
Version: unspecified
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: General
Assignee: krita-bugs-n...@kde.org
Reporter: asr...@gmail.com
Target Milestone: ---
SUMMARY
With HiDPI scaling(probably >= 175%), rotating canvas back and forth cause
offset of viewport.
STEPS TO REPRODUCE
1. create image under OS 200% scaling
2. use mouse middle button + shift to rotate canvas back and forth several
times.
OBSERVED RESULT
The canvas moved a little bit towards the left top corner.
EXPECTED RESULT
Canvas stays at center.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian sid
Qt Version: 5.15.2
ADDITIONAL INFORMATION
This seems to be caused by snapToDevicePixel in
KisCoordinatesConverter::correctOffsetToTransformation, a quick dirty fix is to
add an float offset dp to the point passed in, depending on scaling factor.
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