https://bugs.kde.org/show_bug.cgi?id=523146
Bug ID: 523146
Summary: KWin accepts buffer_scale commit with non-divisible
buffer size
Classification: Plasma
Product: kwin
Version First master
Reported In:
Platform: unspecified
OS: All
Status: REPORTED
Severity: normal
Priority: NOR
Component: wayland-generic
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
Created attachment 194358
--> https://bugs.kde.org/attachment.cgi?id=194358&action=edit
testcase for invalid buffer
DESCRIPTION
Wayland requires the compositor to send wl_surface.error.invalid_size when a
surface is committed with a buffer whose size is not divisible by the committed
buffer_scale.
Reference: https://wayland.app/protocols/wayland#wl_surface:request:attach
The attached test commits wl_surface.set_buffer_scale(2), then attaches and
commits a 773x688 ARGB8888 wl_shm buffer. Because 773 is not divisible by 2,
this commit should be rejected with invalid_size.
STEPS TO REPRODUCE
1. Compile the testcase:
test.c with gcc test.c -o test $(pkg-config --cflags --libs wayland-client)
2. Run ./test with correct WAYLAND_DISPLAY and XDG_RUNTIME_DIR.
3. Check the output.
OBSERVED RESULT
The test prints:
fail: compositor accepted an invalid buffer-scale mismatch
EXPECTED RESULT
The test prints:
success: compositor rejected the invalid buffer size with
wl_surface.error.invalid_size
SOFTWARE/OS VERSIONS
Operating System: NixOS 25.04
kwin: master ed1ee4fda4
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