83713a38bb
The value returned from clutter_frame_get_target_presentation_time() is always same as the value returned from clutter_frame_get_min_render_time_allowed() when they are called consecutively because both functions effectively return the value of frame->has_target_presentation_time. This is with the assumption that this variable is only ever modified by the same thread that also executes on_after_update(). As such, a case where the former returns FALSE after the latter returned TRUE is not possible, which means the line that sets "target_presentation_time_us = 0;" is effectively unreachable. Acknowledging this fact allows the call to clutter_frame_get_target_presentation_time() to be moved outside the "else" case and into the "if" condition itself. This is done in preparation for the next commits. No change in behavior. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3521>
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.