3bca29f303
In theory there's no big difference between only handling mapped actors vs only handling visible actors in clutter_actor_allocate(): The function is called recursively starting with an actor that is attached to a stage, so it should only be called on mapped actors anyway. The behavior of skipping hidden actors was introduced as an optimization with commit 0eab73dc. Since the last commit, we handle enable_paint_unmapped a bit better and don't do unnecessary work when mapping or unmapping, so we can now be a bit stricter enforcing our invariants and only allow mapped actors in clutter_actor_allocate(). We need to exclude toplevel actors from this check since the stage has a very different mapped state than normal actors, depending on the mappedness of the x11 window. Also we need to make an exception for clones (of course...): Those need their source actor to have an allocation, which means they might try to force-allocate it, and in that case we shouldn't bail out of clutter_actor_allocate(). Also moving the clutter_actor_queue_relayout() call from clutter_actor_real_show() to clutter_actor_real_map() seems to fix a bug where we don't queue redraws/relayouts on children when a parent gets shown. Fixes https://gitlab.gnome.org/GNOME/gnome-shell/-/issues/2973 https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1366
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.