bf6dde87f8
The timestamp sent with _NET_WM_FRAME_DRAWN should be in "high resolution X server timestamps", meaning they should have the same scope as the built in X11 32 bit unsigned integer timestamps, i.e. overflow at the same time. This was not done correctly when mutter had determined the X server used the monotonic clock, where it'd just forward the monotonic clock, confusing any client using _NET_WM_FRAME_DRAWN and friends. Fix this by 1) splitting the timestamp conversiot into an X11 case and a display server case, where the display server case simply clamps the monotonic clock, as it is assumed Xwayland is always usign the monotonic clock, and 2) if we're a X11 compositing manager, if the X server is using the monotonic clock, apply the same semantics as the display server case and always just clamp, or if not, calculate the offset every 10 seconds, and offset the monotonic clock timestamp with the calculated X server timestamp offset. This fixes an issue that would occur if mutter (or rather GNOME Shell) would have been started before a X11 timestamp overflow, after the overflow happened. In this case, GTK3 clients would get unclamped timestamps, and get very confused, resulting in frames queued several weeks into the future. https://gitlab.gnome.org/GNOME/mutter/-/merge_requests/1494 |
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| .gitlab-ci | ||
| clutter | ||
| cogl | ||
| data | ||
| doc | ||
| meson | ||
| po | ||
| src | ||
| subprojects | ||
| tools | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| config.h.meson | ||
| COPYING | ||
| meson.build | ||
| meson_options.txt | ||
| mutter.doap | ||
| NEWS | ||
| README.md | ||
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.