8f268f2930
When the pointer crosses monitors, we account for a single motion event resulting in the pointer moving across more than 2 monitors, in order to correctly account each monitor scale and the distance traversed across each monitor in the resulting relative motion vector. However, memory on the direction is kept short, each iteration to find the target view just remembers the direction it came from. This brings a pathological case with 4 monitors with the same resolution in a 2x2 grid, and a motion vector that crosses monitors at the intersection of all 4 in a perfect diagonal. (Say, monitors are all 1920x1080 and pointer moves from 1920,1080 to 1919,1079). In that case, the intersection point at the crossing between 4 monitors (say, 1920,1080) will be considered to intersect with 2 edges of each view. Since there is always at least 2 directions to try, the loop will always find the direction other than the one it came from, and as a result endlessly jump across all 4 possible choices. In order to fix this, consider only the global v/h directions, we already know if the pointer moves left/right or up/down, so only consider those directions to jump across monitors. For the case at hand, this will result in three monitors visited, (either bottomright/bottomleft/topleft, or bottomright/topright/topleft) with a total distance of 0,0 in the middle one, effectively resulting in a correct diagonal motion. Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/2598 Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2803> |
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| .gitlab/issue_templates | ||
| .gitlab-ci | ||
| clutter | ||
| cogl | ||
| data | ||
| doc | ||
| meson | ||
| po | ||
| src | ||
| subprojects | ||
| tools | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| check-style.py | ||
| config.h.meson | ||
| COPYING | ||
| HACKING.md | ||
| meson_options.txt | ||
| meson.build | ||
| mutter.doap | ||
| NEWS | ||
| README.md | ||
Mutter
Mutter is a Wayland display server and X11 window manager and compositor library.
When used as a Wayland display server, it runs on top of KMS and libinput. It implements the compositor side of the Wayland core protocol as well as various protocol extensions. It also has functionality related to running X11 applications using Xwayland.
When used on top of Xorg it acts as a X11 window manager and compositing manager.
It contains functionality related to, among other things, window management, window compositing, focus tracking, workspace management, keybindings and monitor configuration.
Internally it uses a fork of Cogl, a hardware acceleration abstraction library used to simplify usage of OpenGL pipelines, as well as a fork of Clutter, a scene graph and user interface toolkit.
Mutter is used by, for example, GNOME Shell, the GNOME core user interface, and by Gala, elementary OS's window manager. It can also be run standalone, using the command "mutter", but just running plain mutter is only intended for debugging purposes.
Contributing
To contribute, open merge requests at https://gitlab.gnome.org/GNOME/mutter.
It can be useful to look at the documentation available at the Wiki.
The API documentation is available at:
- Meta: https://gnome.pages.gitlab.gnome.org/mutter/meta/
- Clutter: https://gnome.pages.gitlab.gnome.org/mutter/clutter/
- Cally: https://gnome.pages.gitlab.gnome.org/mutter/cally/
- Cogl: https://gnome.pages.gitlab.gnome.org/mutter/cogl/
- CoglPango: https://gnome.pages.gitlab.gnome.org/mutter/cogl-pango/
Coding style and conventions
See HACKING.md.
Git messages
Commit messages should follow the GNOME commit message
guidelines. We require an URL
to either an issue or a merge request in each commit. Try to always prefix
commit subjects with a relevant topic, such as compositor: or
clutter/actor:, and it's always better to write too much in the commit
message body than too little.
Default branch
The default development branch is main. If you still have a local
checkout under the old name, use:
git checkout master
git branch -m master main
git fetch
git branch --unset-upstream
git branch -u origin/main
git symbolic-ref refs/remotes/origin/HEAD refs/remotes/origin/main
License
Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.