https://bugs.kde.org/show_bug.cgi?id=407272

            Bug ID: 407272
           Summary: Color Smudge Engine Missing Subpixel Detection
           Product: krita
           Version: unspecified
          Platform: unspecified
                OS: All
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Brush engines
          Assignee: krita-bugs-n...@kde.org
          Reporter: til.schmit...@gmx.de
  Target Milestone: ---

Created attachment 119873
  --> https://bugs.kde.org/attachment.cgi?id=119873&action=edit
Comparison Quick Brush vs. Color Smudge

SUMMARY
I noticed my paintings always look a bit jagged. This shouldn't be a problem
though, even if i do paint at a lower resolution. i then investigated further
and noticed the Color Smudge Engine has no subpixel pointer detection like the
Quick Brush Engine for example.

STEPS TO REPRODUCE
1. Pick any Color Smudge Engine Brush with a size of about 1 px.
2. Zoom in to about 800%
3. Use the line tool to draw a not completely straight line.

OBSERVED RESULT
There is no antialiasing before the line jumps to the next pixel, no matter the
precision in the brush settings.

EXPECTED RESULT
Any kind of antialiasing

SOFTWARE/OS VERSIONS
Windows 10: Yes
macOS: Not verified, likely a problem too.
Linux (Ubuntu): Yes
Krita Version: 4.2.0 pre-alpha, though probably not a new thing.

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