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Daniel van Vugt 7a0bc5af7f background: Limit mipmap levels to avoid loss of visible detail
When the wallpaper image is larger than the monitor resolution we already
use mipmapping to scale it down smoothly in hardware. We use
`GL_TEXTURE_MIN_FILTER` = `GL_LINEAR_MIPMAP_LINEAR` for the highest quality
scaling that GL can do. However that option is designed for 3D use cases
where the mipmap level is changing over time or space.

Since our wallpaper is not changing distance from us we can improve the
rendering quality even more than `GL_LINEAR_MIPMAP_LINEAR`. To do this we
now set `GL_TEXTURE_MAX_LEVEL` (if available) to limit the mipmap level or
blurriness level to the lowest resolution (highest level) that is still
equal to or higher than the monitor itself. This way we get the benefits
of mipmapping (downscaling in hardware) *and* retain the maximum possible
sharpness for the monitor resolution -- something that
`GL_LINEAR_MIPMAP_LINEAR` alone doesn't do.

Example:

  Monitor is 1920x1080
  Wallpaper photo is 4000x3000
  Mipmaps stored on the GPU are 4000x3000, 2000x1500, 1000x750, ...

  Before: You would see an average of the 2000x1500 and 1000x750 images.
  After:  You will now only see the 2000x1500 image, linearly sampled.

https://gitlab.gnome.org/GNOME/mutter/merge_requests/1003
2020-05-13 09:37:31 +00:00
.gitlab/issue_templates gitlab: Add missing < in markdown comment tag 2020-02-14 03:10:28 +00:00
.gitlab-ci ci: Enable coverage reports in test build 2020-05-07 22:08:44 +00:00
clutter clutter-actor: Remove unused clutter_actor_get_allocation_vertices 2020-05-08 09:52:49 +00:00
cogl cogl: Add new function cogl_pipeline_set_layer_max_mipmap_level() 2020-05-13 09:37:31 +00:00
data display: Make check-alive timeout configureable 2020-02-23 17:28:57 +00:00
doc Add MetaGravity and replace X11 equivalent with it 2020-02-29 21:01:50 +00:00
meson build: Add postinstall script 2019-08-27 09:57:54 +00:00
po Update German translation 2020-04-24 22:38:04 +00:00
src background: Limit mipmap levels to avoid loss of visible detail 2020-05-13 09:37:31 +00:00
tools tools: Remove obsolete ppa-magic.py 2018-11-30 11:12:12 +08:00
.gitignore project: Update gitignore 2019-01-10 11:50:54 -02:00
.gitlab-ci.yml ci: Save built artifacts only for the test build 2020-05-07 22:08:44 +00:00
config.h.meson Add read-only anonymous file abstraction MetaAnonymousFile 2020-04-21 17:52:08 +02:00
COPYING
meson_options.txt meson: Expand on xwayland_initfd option description 2020-03-09 17:59:25 +00:00
meson.build build: Add configuration summary line about coverage being enabled 2020-05-07 22:08:44 +00:00
mutter.doap doap: Update list of maintainers 2019-10-16 12:33:47 +02:00
NEWS Bump version to 3.37.1 2020-04-29 18:47:11 +02:00
README.md README: Add contribution section 2019-02-14 15:38:46 +01:00

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.