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A clutter actor might be painted on a stage view with a view scale other than 1. In this case, to show the content in full resolution, the actor must use a higher resolution resource (e.g. texture), which will be down scaled to the stage coordinate space, then scaled up again to the stage view framebuffer scale. Use a 'resource-scale' property to save information and notify when it changes. The resource scale is the ceiled value of the highest stage view scale a actor is visible on. The value is ceiled because using a higher resolution resource consistently results in better output quality. One reason for this is that rendering is often not perfectly pixel aligned, meaning even if we load a resource with a suitable size, due to us still scaling ever so slightly, the quality is affected. Using a higher resolution resource avoids this problem. For situations inside clutter where the actual maximum view scale is needed, a function _clutter_actor_get_real_resource_scale() is provided, which returns the non-ceiled value. Make sure we ignore resource scale computation requests during size requests or allocation while ensure we've proper resource-scale on pre-paint. https://bugzilla.gnome.org/show_bug.cgi?id=765011 https://gitlab.gnome.org/GNOME/mutter/merge_requests/3
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.