a62dbc6680
Print the pixel format chosen for an output on a secondary GPU for debugging. Knowing the format can aid in debugging e.g. red/blue channel swaps and CPU copy performance issues. This adds a DRM format printing helper in meta-crtc-kms.h. This header is included in most native backend files making it widely available, while DRM formats are specific to the native backend. It could be shared with Wayland bits, DRM format codes are used there too. The helper makes the pixel format much more readable than a "%x". https://gitlab.gnome.org/GNOME/mutter/merge_requests/341
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.