https://bugs.kde.org/show_bug.cgi?id=491276
Bug ID: 491276
Summary: Instant Preview Artifacting and Stuck On In Parts of
Canvas After Zooming
Classification: Applications
Product: krita
Version: 5.2.3
Platform: Other
OS: All
Status: REPORTED
Severity: normal
Priority: NOR
Component: Instant Preview
Assignee: krita-bugs-n...@kde.org
Reporter: michel.r.berge...@gmail.com
Target Milestone: ---
Created attachment 172282
--> https://bugs.kde.org/attachment.cgi?id=172282&action=edit
instant preview canvas glitch after move
SUMMARY
On a large canvas, tools that use Instant Preview cause artifacting and glitchy
canvas rendering when returning to a non-Instant Preview state, after the zoom
level has changed significantly during the operation, and the tool/operation is
not "properly" committed/ended. It's most noticeable near bottom of canvas, but
applies elsewhere too.
STEPS TO REPRODUCE
1. Ensure "Force Instant Preview for Move Tool" is enabled under Configure
Krita > Performance > Instant Preview.
2. Create a larger document: A3 300ppi (3508 x 4960).
3. Zoom out so the canvas is small (< 10%).
4. Fill the background color with a light grey.
5. Make a new Paint Layer and draw some black squiggles along the bottom edge
of the canvas.
6. Make another new Paint Layer and draw a horizontal line in the center of the
canvas, crossing the whole width. The line is better off not perfectly straight
-- use a regular brush.
7. Select the Move tool on the horizontal line's layer.
8. Click and drag to move the layer towards the bottom of the canvas, then back
up to the center near where it was originally. **This is necessary.**
9. A green box should appear around the layer to signify the Move tool is still
active.
10. Zoom in towards the bottom of the canvas (>40%). Notice that Paint Layer 1
(squiggles) appears very fuzzy from the Instant Preview, and a white line is
showing along the entire bottom edge of the canvas (despite the background
being grey).
**Sometimes the white line shows up on the side of the canvas instead. I don't
make the rules...**
11. Without pressing Enter or Escape, either:
11a. Select another tool (e.g. brush tool); or
11b. Select another Paint Layer.
OBSERVED RESULT
The area around the bottom of the canvas (where the horizontal line was moved
to, then moved away from) will be stuck in a low-detail Instant Preview state,
while only the area near where the horizontal line layer was moved back to will
be reverted back to normal. The bottom of the canvas will remain this way until
something happens to update it. Drawing a line will only fix the area
immediately around the brushstroke. The solution seems to be to toggle the
background layer(s).
EXPECTED RESULT
The entire canvas should be reset back to a fully-rendered, not Instant-Preview
state.
SOFTWARE/OS VERSIONS
Windows: 10 & 11
Linux/KDE Plasma: Linux Mint 21.3 Cinnamon
Krita: 5.2.2 & 5.2.3 (Windows installer, Linux AppImage)
ADDITIONAL INFORMATION
I've attached a gallery of screenshots showing what it looks like.
I've tested and observed this behavior on multiple computers (desktop/laptop),
between multiple OS' (Windows/Linux), dedicated/integrated graphics, drawing
tablet/mouse/trackpad, and every Krita 5.2.x build I've tried. This happens on
new installs of Krita, as well as on my main system.
It seems mostly related to the Move Tool and the Transform Tool, so long as
Force Instant Preview is toggled on for that tool; the regular Instant Preview
Mode (View > Instant Preview Mode) being toggled on/off during normal use seems
irrelevant.
This might be related to bug 480973 but I think that one might be specific to
the Transform Tool and its "Preview" mode Tool Options.
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