https://bugs.kde.org/show_bug.cgi?id=441649
Bug ID: 441649
Summary: random lines appear on canvas and scratchpad while
moving the cursor
Product: krita
Version: 4.4.8
Platform: Appimage
OS: All
Status: REPORTED
Severity: normal
Priority: NOR
Component: General
Assignee: krita-bugs-n...@kde.org
Reporter: takiro-...@gelbfuchs.de
Target Milestone: ---
SUMMARY
When moving the cursor over the canvas (no matter if actually drawing or not)
weird lines appear on the canvas and on the scratch pad in the brush settings
window as if there is a problem with rendering the canvas.
This issue has been reported on Krita-Artist.org a few times already.
>From what I was able to test, for me on Linux it seems to be related to UI
scaling as it only happened after I got a 4k monitor and had to enable the
Systems UI scaling (otherwise Krita's interface is just to small but at least
the bug is not visible). However one User reported to not using UI scaling at
all, but it still happens.
The bug has been reported to happen on Windows and Linux so far.
STEPS TO REPRODUCE
1. Have a high resolution screen
2. Enable UI scaling on OS level
3. Start Krita and open a new document
3. Set background layer to something other than white (better visualizes the
bug)
4. Move Cursor with brush tool selected across the canvas or try painting
OBSERVED RESULT
Horizontal and vertical lines appear around the cursor. Seemingly a square
shape that encloses the brush.
EXPECTED RESULT
Nothing should happen except the actual painting.
ADDITIONAL INFO
The lines are only visually and often disappear when the canvas is refreshed
for some reason. the Same happens on the scratchpad. For me the intensity of
the lines appearing varies from brush to brush with pixel brushes being the
worst and with smudge brushes it doesn't happen as much. Disabling canvas
acceleration made it worse for me, changing the renderer to something else than
OpenGL was not possible for me on Linux but Windows users reported it made not
much of a difference. It seems to even happen when other tools than the brush
tools are used (see linked threads).
This happens at least since version 4.4.0 but could be there for longer since I
didn't had to use UI scaling before. As more people get higher resolution
screens, this seems to affect more users (however one user on windows reported
to not use UI scaling but it still happens).
Here are some example screenshots.
https://krita-artists.org/uploads/default/original/3X/9/c/9c453deb33b3bcdee13bcc42e346ee3a25ed1f76.png
https://krita-artists.org/uploads/default/original/3X/e/8/e8dada204e0a6b91bd234e145453d3bcdbb310fb.png
https://krita-artists.org/uploads/default/original/3X/b/4/b4250b339c89a3171654030461a310e8ec5a24fe.jpeg
Here are a few related threads on krita-artists.org:
https://krita-artists.org/t/weird-artifacts-in-viewport-windows-10/28178
https://krita-artists.org/t/issue-while-moving-the-pen-around/28109
https://krita-artists.org/t/lines-apearing-when-cropping-ect/27372
These are a few but there are more. Currently the community didn't found a
solution.
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