4d4e8e5862
meta_screen_cast_stream_src_set_cursor_sprite_metadata() receives the cursor sprite, position, and scale, and with that it downloads the cursor sprite by drawing it into a separate framebuffer, then calls cogl_framebuffer_read_pixels() in it - this is the offscren path that is very common when using screen capturing applications such as OBS Studio. There's a sneaky issue in this code path though: the 'scale' value is a float. The cursor size is then determined by multiplying the sprite width and height - two integer variables - by scale, and this relies on standard float-to-int conversions. This is problematic as sometimes the rounded values disagree with what is expected by cogl_framebuffer_read_pixels(). If the packing of either the cursor width or height is off by one, glReadPixels() will try to write into off bounds, which crashes. This can be reproduced by enabling fractional scaling, setting a 150% zoom level, on a 4K screen, and opening any commit with an image diff in gitlab.gnome.org, all while screencasting. When hovering the new image, the cursor sprite will be such that it triggers this code path, and reproduces this issue. Fix this by always ceiling the cursor sprite sizes. Closes https://gitlab.gnome.org/GNOME/mutter/-/issues/2542 Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2736> |
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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.