https://bugs.kde.org/show_bug.cgi?id=452085

            Bug ID: 452085
           Summary: low density auto brush preview show an unnecesarily
                    complicated shape that slows the cursor
           Product: krita
           Version: 5.0.2
          Platform: Appimage
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: OpenGL Canvas
          Assignee: krita-bugs-n...@kde.org
          Reporter: kaer...@gmail.com
  Target Milestone: ---

SUMMARY

the outline shape in preview outline mode shows a very complicated outline for
auto brushes that have a low density setting. it results in a slower cursor on
canvas. this looks like a new behavior, the former was showing a simple shape
(ellipse or rectangle) without the density parameter showing on the brush
preview outline, which moved at the same speed as the cursor.
a half workaround is to uncheck "show outline" while painting, which at least
lets paint at normal speed.

STEPS TO REPRODUCE
1. set settings > configure > general > cursor >outline shape in preview
outline
2. use a pixel brush with auto shape and low density
3. move the very complicated cursor on the canvas

OBSERVED RESULT
the cursor is slow and complicated

EXPECTED RESULT
the previous behavior was showing only the brush outline without the noise of
low density, and was much quicker

SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: xubuntu 20.04
(available in About System)
KDE Plasma Version: 
KDE Frameworks Version: 
Qt Version: i don't know

ADDITIONAL INFORMATION

my machine is pretty old (about 10 years) so maybe it's something not as
noticeable with modern hardware, but the previous behavior worked great and was
sufficient for low density brushes.

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