49c8d42317
When painting, actors rely on semi global state tracked by the state to get various things needed for painting, such as the current draw framebuffer. Having state hidden in such ways can be very deceiving as it's hard to follow changes spread out, and adding more and more state that should be tracked during a paint gets annoying as they will not change in isolation but one by one in their own places. To do this better, introduce a paint context that is passed along in paint calls that contains the necessary state needed during painting. The paint context implements a framebuffer stack just as Cogl works, which is currently needed for offscreen rendering used by clutter. The same context is passed around for paint nodes, contents and effects as well. In this commit, the context is only introduced, but not used. It aims to replace the Cogl framebuffer stack, and will allow actors to know what view it is currently painted on. https://gitlab.gnome.org/GNOME/mutter/merge_requests/935
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.