This page lists a few ideas of simple tasks to be implemented in KWin. If you want to work on one, please check with the KWin team whether anybody is working on it already. If you need help on your task you can always contact the KWin team.
KWin provides window tiling which is hardly maintained and unknown to the core KWin team. The idea behind this task is to reimplement the tiling functionality as a KWin Script. This has several advantages: tiling gets properly decoupled from KWin core reducing the maintenance costs for the core team. It would also proof that KWin Scripts are powerful enough to implement a complete new window management concept.
KWin can trigger effects when the mouse enters a screen edge. This could be extended for KWin scripts, so that a specific callback is called in a Script if the Screen Edge is triggered.
Add Global Shortcut Support to KWin Scripts. This would allow a Script to register a callback which gets executed whenever the global shortcut is triggered.
The AnimationEffect provides easy ways to define animations for windows. This could be extended to allow uploading a vertex and/or fragment shader which is used when rendering a window. The AnimationEffect would in that case animate a uniform value of the shader.
Currently KWin stores the window icons in different sizes as dedicated pixmaps. This could be changed to using just one QIcon with all provided sizes.
Extend the KWin Scripts KCM to allow downloading new scripts through Get Hot New Stuff.
Extend the Window Switching KCM to allow downloading new scripts through Get Hot New Stuff.
The QML based Window Switchers provide all functionality to implement a switcher similar to the Present Windows effect. Currently the Present Windows effect can be used as a replacement for a Window Switcher. Unfortunately this is not what Present Windows is designed for and the code base could be simplified if the Present Windows mode is implemented as a Window Switcher.
The WindowPaintData allows effects to transform windows by setting a translation value, a scaling value and a rotation. This is also provided by the QGraphicsTransform and it's inheriting classes, which did not yet exist when the Effects Framework had been implemented. Using QGraphicsTransform makes it easier to apply the transformation in the compositor and to integrate better with QML based window thumbnails.
Since Mesa 8.0 the free drivers support OpenGL 3. This would allow to initialize an OpenGL 3 rendering context if available.
After OpenGL 3 Support has been added to KWin the Shader Manager should be extended to support Geometry Shaders.
After Geometry Shader Support has been added to KWin it should be possible to use a Geometry Shader to calculate the Geometry for Wobbly Windows Effect.
After Geometry Shader Support has been added to KWin it should be possible to use a Geometry Shader to calculate the Geometry for Magic Lamp Effect.
GNOME Shell provides a feature to switch between Windows of the current application on "Alt + Key above Tab". KWin provides everything which is needed for that. To make it easier for users coming from GNOME the same default shortcut could be added preconfigured for this window switching mode.
Since 4.8 the context menu on taskbar entries has a different layout than the one used on the window decoration. This should be synchronized again.