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The new CLUTTER_FRAME_CLOCK_STATE_SCHEDULED_NOW state is almost identical to CLUTTER_FRAME_CLOCK_STATE_SCHEDULED, with one important difference being that it avoids updates from being repeatedly rescheduled "now" when multiple calls to clutter_frame_clock_schedule_update_now() are done before the source is actually dispatched. Such repeated calls to schedule an update "now" may actually postpone the dispatch if the CPU is very busy and the source dispatch is delayed, defeating the purpose of scheduling a frame "now". It also allows rescheduling "now" when the frame clock is uninhibited after being inhibited while an update was scheduled "now". This may be important in cases where the frame clock is inhibited for very short periods in which it would otherwise lose the state of being scheduled "now". Scenarios such as this would become more common with the introduction of variable refresh rate since it makes scheduling "now" a commonplace occurrence. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3561>
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.