Bug 439053 - GTK apps show pixelated cursors on wayland with hiDPI screen
Summary: GTK apps show pixelated cursors on wayland with hiDPI screen
Status: RESOLVED FIXED
Alias: None
Product: kwin
Classification: Plasma
Component: wayland-generic (show other bugs)
Version: unspecified
Platform: Other Linux
: NOR normal
Target Milestone: ---
Assignee: KWin default assignee
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2021-06-23 08:52 UTC by Emilio Cobos Álvarez (:emilio)
Modified: 2021-06-25 09:07 UTC (History)
1 user (show)

See Also:
Latest Commit: https://invent.kde.org/plasma/kwin/-/commit/14b70e5e777ac92fd97a0f328642898153794f27
Version Fixed In: 5.23.0
Sentry Crash Report:

Attachments
Dummy GTK window. (317 bytes, text/x-python)
2021-06-23 08:52 UTC, Emilio Cobos Álvarez (:emilio) 		Details
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Description Emilio Cobos Álvarez (:emilio) 2021-06-23 08:52:44 UTC 
Created attachment 139604 [details]
Dummy GTK window.

SUMMARY

With a HiDPI screen and using wayland, GTK apps show pixelated cursors.

STEPS TO REPRODUCE
1. Run any GTK application (such as the attached one).

OBSERVED RESULT

Pixelated cursor.

EXPECTED RESULT

Crisp cursor such as the ones in QT applications.

SOFTWARE/OS VERSIONS
Operating System: Fedora 34
KDE Frameworks Version: 5.82.0
Qt Version: 5.15.2
Kernel Version: 5.12.11-300.fc34.x86_64
OS Type: 64-bit
Graphics Platform: Wayland

ADDITIONAL INFORMATION

This happens independently of the GTK cursor theme in use.
Comment 1 Emilio Cobos Álvarez (:emilio) 2021-06-23 09:11:24 UTC 
The scale is supposed to be updated via `pointer_surface_enter` / `pointer_surface_leave`, but that doesn't get called, so it remains one forever: https://gitlab.gnome.org/GNOME/gtk/-/blob/981a638b01c2ae0fe4d15b6b97667679978a94fc/gdk/wayland/gdkdevice-wayland.c#L4579
Comment 2 Vlad Zahorodnii 2021-06-23 10:48:11 UTC 
pointer_surface_enter is not called because kwin doesn't send wl_surface::enter/leave events.
Comment 3 Bug Janitor Service 2021-06-23 12:14:28 UTC 
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwayland-server/-/merge_requests/254
Comment 4 Bug Janitor Service 2021-06-23 14:19:59 UTC 
A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/1128
Comment 5 Vlad Zahorodnii 2021-06-25 09:07:55 UTC 
Hmm, it seems like the bug report wasn't auto-closed because the commit has no BUG keyword.