https://bugs.freedesktop.org/show_bug.cgi?id=104426
Bug ID: 104426
Summary: Xwayland: XWarpPointer does not move the pointer if
src_w == root window
Product: Wayland
Version: unspecified
Hardware: x86-64 (AMD64)
OS: Linux (All)
Status: NEW
Severity: normal
Priority: medium
Component: XWayland
Assignee: [email protected]
Reporter: [email protected]
QA Contact: [email protected]
Created attachment 136466
--> https://bugs.freedesktop.org/attachment.cgi?id=136466&action=edit
pointer warp test program
Distribution: Arch Linux
xorg-server-xwayland 1.19.6-2
gnome-shell 3.26.2+9+ga3736d3a3-1
mutter 3.26.2+31+gbf91e2b4c-1
libxfixes 5.0.3-1
gcc 7.2.1-2
When XWarpPointer is called with the src_w parameter set to
DefaultRootWindow(display), like e.g. Wine calls it, the function does not move
the pointer to the desired position under rootless XWayland. This is because
PointInWindowIsVisible
(https://cgit.freedesktop.org/xorg/xserver/tree/dix/events.c?h=server-1.19-branch&id=ebfb06b11955a6c32500b7086be912ab96b753a7#n3578)
returns false due to the fact that the borderClip property of the root window
is initialized to RegionNull(&window->borderClip):
borderClip = {extents = {x1 = 0, y1 = 0, x2 = 0, y2 = 0}, data = 0x56386383b280
<RegionEmptyData>}
RegionEmptyData = {size = 0, numRects = 0}
How to reproduce:
1. Download the attached test program source
2. $ gcc -std=c11 -lX11 -lXfixes pointer_warp_test.c -o pointer_warp_test
3. start gnome-shell for Wayland
4. run the compiled binary $ ./pointer_warp_test
5. press tab while the pointer is inside the window
6. move the pointer and observe its behavior
- the smaller square represents the position of the real pointer as the
application sees it
- the larger square represents the application cursor
7. the test program exhibits the correct behavior if the application cursor
exactly follows mouse movements
and the real cursor stays near the middle, as it is continually warped
there; the real cursor, however, does not stay
in the middle because it is not warped at all
The issue can also be reproduced in the Windows version of OpenArena under
Wine. Wine has to have virtual desktop emulation disabled (winecfg -> Graphics
tab -> Emulate a virtual desktop) in order for the the issue to be present.
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