4736f873f2
This uses MetaCompositorViewNative to find a candidate surface for scanout and to keep track of it separately for each view, effectively allowing each CRTC to use a different buffer for direct scanout. There are three parts for potentially assigning a buffer for direct scanout at the compositor level: 1. Finding a candidate surface actor on the view (if any) 2. Attempting to assign the candidate's buffer for direct scanout 3. Updating references relating to the scanout candidate as needed The three parts were moved in their entirety from being handled by the MetaCompositorNative to being handled by the MetaCompositorViewNative. As part of this transition, the logic was also slightly refactored so that each of the three parts is handled by its own helper function. This allowed to avoid the use of "goto" statements and hopefully make the logic easier to read and follow. The first part mentioned above was changed in this commit to make use of the new meta_compositor_view_get_top_window_actor () API to get the top window actor in the view instead of the top window actor on all views. The second part and third parts mentioned above weren't changed other than being done in the context of a view instead of globally. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2526>
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.