https://bugs.kde.org/show_bug.cgi?id=496075

            Bug ID: 496075
           Summary: When using a pen tablet, brush pressure is not
                    available and coordinates are sometimes incorrect.
    Classification: Applications
           Product: krita
           Version: 5.2.6
          Platform: Other
                OS: Microsoft Windows
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: Tablets (tablet issues are only very rarely bugs in
                    Krita!)
          Assignee: krita-bugs-n...@kde.org
          Reporter: microsunr...@outlook.jp
  Target Milestone: ---

Created attachment 175722
  --> https://bugs.kde.org/attachment.cgi?id=175722&action=edit
BrushPressureIsNotApplied.mp4

SUMMARY
When using a pen tablet, the brush pressure and coordinates are wrong.
Please watch the attached video.
When I set the brush pressure in the brush editor and draw a curve on the
scratchpad, I get a curve with brush pressure ignored at the tablet pointer
coordinates or a curve with brush pressure applied at odd coordinates.
Other drawing software running at the same time will draw the curve with the
brush pressure applied correctly.
In addition, sometimes, when drawing on canvas with a pen tablet, the drawing
is drawn at odd coordinates.
The Tablet Input API in the Tablet settings in Configure is set to WinTab. If
this is changed, brush pressure is not applied.

STEPS TO REPRODUCE
1. Select ink-3 Gpen in the paint layer.
2. Open the Brush editor and check Size and Pressure.
3. Draw on the scratchpad with a pen tablet.

OBSERVED RESULT
Brush pressure is not applied.
Lines are sometimes drawn at odd coordinates.

SOFTWARE/OS VERSIONS
OS
 Windows 10(64) Pro
Krita
  Version: 5.2.6 (git ab3502b)
Qt
  Version (compiled): 5.15.7
  Version (loaded): 5.15.7

Thank you for developing this wonderful software.

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