53b52e26f5
'screen-cast/monitor-src: Use clutter_stage_paint_to_buffer' (6c818cd8d5d29a21288d64fcbb13eae6a69d65df) made the non-dma-buf path use clutter_stage_paint_to_buffer() to avoid running into direct scanout issues. At a glance, the dma-buf paths didn't have the same issue since it explicitly handled dma-bufs by blitting them. What it also did was move the recording to an idle callback, to avoid paint reentry issues. A side effect of this, however, is that it also broke the dma-buf paths, as they rely on the back buffer existing, and the stage view direct scanout already being setup, which it isn't in an idle callback. Fix this by using the dma-buf variant of clutter_stage_paint_to_buffer(): clutter_stage_paint_to_framebuffer(). This has some negative performance impact, but we can't use cogl_blit_framebuffer() when using an idle callback for recording. Potential performance improvements to make things work more as they did before is to enhance 'cogl_blit_framebuffer()' a bit, making it a vfunc that could be implemented by MetaOnscreenNative. A flag to say whether to look at the back or front buffer would let MetaOnscreenNative know whether to use the already committed-to-KMS buffer, or the current back buffer. Fixes: 6c818cd8d5d29a21288d64fcbb13eae6a69d65df Closes: https://gitlab.gnome.org/GNOME/mutter/-/issues/2282 Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/2462>
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 af 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.