Bug 501215 - Mouse mark is not drawing smooth lines under X11
Summary: Mouse mark is not drawing smooth lines under X11
Status: REPORTED
Alias: None
Product: kwin
Classification: Plasma
Component: effects-various (show other bugs)
Version: 6.3.0
Platform: Debian testing Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords: X11-only
Depends on:
Blocks:
 
Reported: 2025-03-08 07:18 UTC by A. Ismail
Modified: 2025-03-11 21:54 UTC (History)
2 users (show)

See Also:
Latest Commit:
Version Fixed In:
Sentry Crash Report:

Attachments
Debian swirl drawn using mouse mark under Plasma 6 (12.38 KB, image/png)
2025-03-08 07:18 UTC, A. Ismail 		Details
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Description A. Ismail 2025-03-08 07:18:19 UTC 
Created attachment 179218 [details]
Debian swirl drawn using mouse mark under Plasma 6

SUMMARY

When using the mouse mark effect under X11, the line drawn is not smooth at all, as if the mouse position sample rate is too low to create a proper smooth line like it used to. This problem does not exist for Wayland.

I noticed also that the small icon that appears under the cursor when opening an application doesn't move around smoothly with the mouse, it is probably related to this bug.

STEPS TO REPRODUCE
1. Enable the mouse mark desktop effect
2. Try to draw anything with it relatively quickly and with curves

OBSERVED RESULT
The curve looks like a polyline with sharp edges

EXPECTED RESULT
The curve should be smooth.


SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Debian 13 (trixie/testing)
KDE Plasma Version: 6.3.0
KDE Frameworks Version: 6.11.0
Qt Version: 6.7.2

ADDITIONAL INFORMATION

This issue didn't occur with Plasma 5, it started with the upgrade to Plasma 6.