https://bugs.kde.org/show_bug.cgi?id=423465
Bug ID: 423465
Summary: Wrong rendering when using "Destination Atop" blending
mode
Product: krita
Version: git master
Platform: Compiled Sources
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: General
Assignee: krita-bugs-n...@kde.org
Reporter: gin...@gmail.com
Target Milestone: ---
Created attachment 129655
--> https://bugs.kde.org/attachment.cgi?id=129655&action=edit
test image
The destination atop compositing op seems to mix the colors wrong with some
artifacts in some cases.
Attached is a test image file.
STEPS TO REPRODUCE
1. Paint something in a transparent layer.
2. Paint something else a different color in another transparent layer on top
of the previous, overlaping the two shapes.
3. Choose "Destination Atop" blending mode on the layer on top.
OBSERVED RESULT
Sample image: https://imgur.com/a/tcIngTC
EXPECTED RESULT
The artifacts shouldn't appear
SOFTWARE/OS VERSIONS
Operating System: Manjaro Linux
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.70.0
Qt Version: 5.15.0
ADDITIONAL INFORMATION
I looked at the code and think this could be fixed by modifying the file
libs/pigment/compositeops/KoCompositeOpDestinationAtop.h
Changing lines 61 and 62:
channels_type srcMult= mul(src[channel], appliedAlpha);
dst[channel] = lerp(srcMult,dst[channel],dstAlpha);
by:
dst[channel] = lerp(src[channel],dst[channel],dstAlpha);
seems to solve the problem
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