0810238d22
Currently, ClutterFrameClock uses g_source_set_ready_time() to determine the usec timing of the next frame. That translates into a poll() with a millisecond timeout if no trigger occurs to break the poll() out early. To avoid spinning the CPU, GLib always rounds *up* to the next millisecond value unless a timeout of 0 was provided by a GSource. This means that timeouts for the ClutterFrameClock can easily skew beyond their expected time as the precision is too coarse. This applies the same concept as GNOME/glib!3949 but just for the ClutterFrameClock. That may be more ideal than adding a timerfd for every GMainContext, but we'll see if that lands upstream. I wanted to provide this here because it could easily be cherry-picked in the mean time if this is found to be useful. From a timer stability perspective, this improves things from erratically jumping between 100s and 1000s off of the expected awake time to single or low double digits. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3636>
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 first look at the GNOME Handbook and the documentation and API references below first.
Documentation
- Coding style and conventions
- Git conventions
- Code overview
- Building and Running
- Debugging
- Monitor configuration
API Reference
- Meta: https://mutter.gnome.org/meta/
- Clutter: https://mutter.gnome.org/clutter/
- Cally: https://mutter.gnome.org/cally/
- Cogl: https://mutter.gnome.org/cogl/
- CoglPango: https://mutter.gnome.org/cogl-pango/
- Mtk: https://mutter.gnome.org/mtk/
License
Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.