6831f2edb4
This shape region culling was wrongly implemented in f5a28aa9, as it does not take frame offsets into account, and is also redundant, as we already set the opaque region of the underlying surface accordingly. The other parts were implemented in ac7aa114, the reason given in the commit message: ``` Wayland clients do this through the opaque region in the surface actor. However X11 clients were considered fully transparent for culling purposes, which may result in mutter painting other bits of the background or other windows that will be painted over in reality. ``` is wrong though - culling on X11 actors works just fine and did only not work in Wayland sessions because of a bug that got fixed in 19814497. In conclusion the whole part appears to be redundand and some testing done suggests the same. Drop it. https://gitlab.gnome.org/GNOME/mutter/merge_requests/1082
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.