![Jonas Dreßler](/assets/img/avatar_default.png)
Turns out there is a better solution: Almost always, MetaWindow already has an idea on which monitor it will be, even if it isn't positioned yet. Since the last commit we're now using that monitor for setting the highest-output-scale of the window, so this fallback is no longer necessary. While we could keep this fallback around and also return a valid scale in case the surface is not even mapped yet, this means we report fractional scale twice for new surfaces: Once from wp_fractional_scale_manager::get_fractional_scale() (here we'll enter the fallback), and a second time (this time with correct scale) right after creating the MetaWindow. Note that wp_fractional_scale_v1 doesn't specify that a preferred_scale event must be sent immediately after wp_fractional_scale_manager::get_fractional_scale(), so we can safely remove the fallback. This reverts commit 8cfbdb4313edbd7748fb21769d37bf5c35692042. Part-of: <https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/3598>
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.