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Platform backends are provided as plugins. This is great for extensibility, but the disadvantages of this design outweigh the benefits. The number of backends will be limited, it's safe to say that we will have to maintain three backends for many years to come - kms/drm, virtual, and wayland. The plugin system adds unnecessary complexity. Startup logic is affected too. At the moment, platform backends provide the session object, which is awkward as it starts adding dependencies between backends. It will be nicer if the session is created depending on the loaded session type. In some cases, wayland code needs to talk to the backend directly, e.g. for drm leasing, etc. With the plugin architecture it's hard to do that. Not impossible though, we can approach it as in Qt 6, but it's still harder than linking the code directly. Of course, the main disadvantage of shipping backends in a lib is that you will need to patch kwin if you need a custom platform, however such cases will be rare. Despite that disadvantage, I still think that it's a step in the right direction where the goal is to have multi-purpose backends and other reusable components of kwin. The legacy X11 standalone platform is linked directly to kwin_x11 executable, while the remaining backends are linked to libkwin. |
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| autotests | ||
| cmake/modules | ||
| data | ||
| doc | ||
| kconf_update | ||
| LICENSES | ||
| src | ||
| tests | ||
| .clang-format | ||
| .gitignore | ||
| .gitlab-ci.yml | ||
| .kde-ci.yml | ||
| CMakeLists.txt | ||
| CONTRIBUTING.md | ||
| KWinDBusInterfaceConfig.cmake.in | ||
| logo.png | ||
| Mainpage.dox | ||
| plasma-kwin_wayland.service.in | ||
| plasma-kwin_x11.service.in | ||
| README.md | ||
KWin
KWin is an easy to use, but flexible, composited Window Manager for Xorg windowing systems (Wayland, X11) on Linux. Its primary usage is in conjunction with a Desktop Shell (e.g. KDE Plasma Desktop). KWin is designed to go out of the way; users should not notice that they use a window manager at all. Nevertheless KWin provides a steep learning curve for advanced features, which are available, if they do not conflict with the primary mission. KWin does not have a dedicated targeted user group, but follows the targeted user group of the Desktop Shell using KWin as it's window manager.
KWin is not...
- a standalone window manager (c.f. openbox, i3) and does not provide any functionality belonging to a Desktop Shell.
- a replacement for window managers designed for use with a specific Desktop Shell (e.g. GNOME Shell)
- a minimalistic window manager
- designed for use without compositing or for X11 network transparency, though both are possible.
Contributing to KWin
Please refer to the contributing document for everything you need to know to get started contributing to KWin.
Contacting KWin development team
- mailing list: kwin@kde.org
- IRC: #kde-kwin on irc.libera.chat
Support
Application Developer
If you are an application developer having questions regarding windowing systems (either X11 or Wayland) please do not hesitate to contact us. Preferable through our mailing list. Ideally subscribe to the mailing list, so that your mail doesn't get stuck in the moderation queue.
End user
Please contact the support channels of your Linux distribution for user support. The KWin development team does not provide end user support.
Reporting bugs
Please use KDE's bugtracker and report for product KWin.
Guidelines for new features
A new Feature can only be added to KWin if:
- it does not violate the primary missions as stated at the start of this document
- it does not introduce instabilities
- it is maintained, that is bugs are fixed in a timely manner (second next minor release) if it is not a corner case.
- it works together with all existing features
- it supports both single and multi screen (xrandr)
- it adds a significant advantage
- it is feature complete, that is supports at least all useful features from competitive implementations
- it is not a special case for a small user group
- it does not increase code complexity significantly
- it does not affect KWin's license (GPLv2+)
All new added features are under probation, that is if any of the non-functional requirements as listed above do not hold true in the next two feature releases, the added feature will be removed again.
The same non functional requirements hold true for any kind of plugins (effects, scripts, etc.). It is suggested to use scripted plugins and distribute them separately.