6ea0f8facc
For ClutterClones we need to apply a scale to the texture of the clone to ensure the painted texture of the source actor actually fits the allocation of the clone. We're doing this using the transformation matrix instead of using the scale_x/scale_y properties of ClutterActor to allow users to scale ClutterClones using that API independently. Now it's quite a bad idea to get the allocation boxes for calculating that scale using clutter_actor_get_allocation_box(), since that method will internally do an immediate relayout of the stage in case the actor isn't allocated. Another side effect of that approach is that it makes it impossible to invalidate the transform (which will be needed when we start caching those matrices) properly. So since we eventually allocate both the source actor and the clone ourselves anyway, we can simply use the allocation box inside clutter_clone_allocate() (which is definitely updated and valid at that point) to calculate the scale factor. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1181
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.
The coding style used is primarily the GNU flavor of the GNOME coding
style
with some minor additions such as preferring stdint.h types over GLib
fundamental types, and a soft 80 character line limit. However, in general,
look at the file you're editing for inspiration.
Commit messages should follow the GNOME commit message guidelines. We require an URL to either an issue or a merge request in each commit.
License
Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.