https://bugs.kde.org/show_bug.cgi?id=406400
Bug ID: 406400
Summary: Black artifacts when painting with brush on 32-bit
image with Vector Optimizations enabled
Product: krita
Version: git master
Platform: Other
OS: All
Status: REPORTED
Severity: normal
Priority: NOR
Component: Brush engines
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 119329
--> https://bugs.kde.org/attachment.cgi?id=119329&action=edit
Screenshot of the problem
1) Enable Vector Optimizations (VC) in the performance tab
2) Create a 32-bit float image
3) Draw with Basic-5 Size brush
Observe random black tiles aligned by 32/16-byte level (8/4 pixels).
See the attached screenshot.
The bug appears on both Windows and Linux with Vc 1.3.3, with either AVX or
SSE4 implementation used. It means that it is unrelated to bug 406209. It is
somehow related to our implementation of AlphaDarkenCompositor128 and
OverCompositor128.
PS:
Or a bug in Vc...
PPS:
Or a bug in GCC...
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