1c98f01a65
Prior to this commit the stage was drawn separately for each logical monitor. This allowed to draw different parts of the stage with different transformations, e.g. with a different viewport to implement HiDPI support. Go even further and have one view per CRTC. This causes the stage to e.g. draw two mirrored monitors twice, instead of using the same framebuffer on both. This enables us to do two things: one is to support tiled monitors and monitor mirroring using the EGLStreams backend; the other is that it'll enable us to tie rendering directly to the CRTC it will render for. It is also a requirement for rendering being affected by CRTC state, such as gamma. It'll be possible to still inhibit re-drawing of the same content twice, but it should be implemented differently, so that it will still be possible to implement features requiring the CRTC split. https://gitlab.gnome.org/GNOME/mutter/merge_requests/1042
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.