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This object takes care of mapping absolute devices to monitors, to do so it uses 3 heuristics, in this order of preference: - If a device is known to be builtin, it's assigned to the builtin monitor. - If input device and monitor match sizes (with an error margin of 5%) - If input device name and monitor vendor/product in EDID match somehow (from "full", through "partial", to just "vendor") The most favorable outputs are then assigned to each device, making sure not to assign two devices of the same kind to the same output. This object replaces (and is mostly 1:1 with) GsdDeviceMapper in g-s-d. That object would perform these same heuristics, and let mutter indirectly know through settings changes. This object allows doing the same in-process.
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.
License
Mutter is distributed under the terms of the GNU General Public License, version 2 or later. See the COPYING file for detalis.