c4fa30ac7d
The method `relative_motion_across_outputs` is used to adjust the distance/delta of a mouse movement across multiple monitors to take the different scale factors of those monitors into account. This works by getting the adjacent monitors that the movement-line/vector intersects with and adjusting the final position (or end point of the movement-line) by multiplying the parts of the line spanning across different monitors with the scale factors of those monitors. In the end of this calculation, we always want to set the new end coordinates of the relative motion to the new end coordinates of the adjusted movement-line. We currently only do that if all adjacent monitors the line is crossing actually exist, because only then we end up inside the "We reached the dest logical monitor" else-block and set `x` and `y` to the correct values. Fix that and make sure the returned values are also correct in case an adjacent monitor doesn't exist by adding separate `target_x` and `target_y` variables which we update during each pass of the while loop so we're always prepared for the while loop exiting before the destination monitor was found. Thanks to Axel Kittenberger for reporting the initial bug and tracking the issue down to `relative_motion_across_outputs`. Fixes https://gitlab.gnome.org/GNOME/mutter/issues/774 |
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| clutter | ||
| cogl | ||
| data | ||
| doc | ||
| meson | ||
| po | ||
| src | ||
| tools | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| config.h.meson | ||
| COPYING | ||
| meson_options.txt | ||
| meson.build | ||
| 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.