My KWIN fork where I work on features like per-output virtual desktops
ac4dce1c20
Summary: Quite long time ago, window decorations were painted on real X11 windows. The nicest thing about that approach is that we get both contents of the client and the frame window at the same time. However, somewhere around KDE 4.2 - 4.3 times, decoration rendering architecture had been changed to what we have now. I've mentioned the previous decoration rendering design because it didn't have a problem that the new design has, namely the texture bleeding issue. In the name of better performance, opengl scene puts all decoration parts to an atlas. This is totally reasonable, however we must be super cautious about things such as the GL_LINEAR filter. The GL_LINEAR filter may need to sample a couple of neighboring texels in order to produce the final texel value. However, since all decoration parts now live in a single texture, we have to make sure that we don't sample texels that belong to another decoration part. This patch fixes the texture bleeding problem by padding each individual decoration part in the atlas. There is another solution for this problem though. We could render a window into an offscreen texture and then map that texture on the transformed window geometry. This would work well and we definitely need an offscreen rendering path in the opengl scene, however it's not feasible at the moment since we need to break the window quads API. Also, it would be great to have as less as possible stuff going on between invocation of Scene::Window::performPaint() and getting the corresponding pixel data on the screen. There is a good chance that the new padding stuff may make you vomit. If it does so, I'm all ears for the suggestions how to make the code more nicer. BUG: 257566 BUG: 360549 CCBUG: 412573 FIXED-IN: 5.18.0 Reviewers: #kwin Subscribers: fredrik, kwin, fvogt Tags: #kwin Differential Revision: https://phabricator.kde.org/D25611 |
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|---|---|---|
| autotests | ||
| cmake/modules | ||
| colorcorrection | ||
| data | ||
| decorations | ||
| doc | ||
| effects | ||
| helpers | ||
| kcmkwin | ||
| kconf_update | ||
| libinput | ||
| libkwineffects | ||
| platformsupport | ||
| plugins | ||
| qml | ||
| scripting | ||
| scripts | ||
| tabbox | ||
| tests | ||
| xwl | ||
| .arcconfig | ||
| .arclint | ||
| abstract_client.cpp | ||
| abstract_client.h | ||
| abstract_opengl_context_attribute_builder.cpp | ||
| abstract_opengl_context_attribute_builder.h | ||
| abstract_output.cpp | ||
| abstract_output.h | ||
| abstract_wayland_output.cpp | ||
| abstract_wayland_output.h | ||
| activation.cpp | ||
| activities.cpp | ||
| activities.h | ||
| appmenu.cpp | ||
| appmenu.h | ||
| atoms.cpp | ||
| atoms.h | ||
| client_machine.cpp | ||
| client_machine.h | ||
| CMakeLists.txt | ||
| composite.cpp | ||
| composite.h | ||
| config-kwin.h.cmake | ||
| COPYING | ||
| cursor.cpp | ||
| cursor.h | ||
| dbusinterface.cpp | ||
| dbusinterface.h | ||
| debug_console.cpp | ||
| debug_console.h | ||
| debug_console.ui | ||
| deleted.cpp | ||
| deleted.h | ||
| effectloader.cpp | ||
| effectloader.h | ||
| effects.cpp | ||
| effects.h | ||
| egl_context_attribute_builder.cpp | ||
| egl_context_attribute_builder.h | ||
| events.cpp | ||
| fixqopengl.h | ||
| focuschain.cpp | ||
| focuschain.h | ||
| geometry.cpp | ||
| geometrytip.cpp | ||
| geometrytip.h | ||
| gestures.cpp | ||
| gestures.h | ||
| globalshortcuts.cpp | ||
| globalshortcuts.h | ||
| group.cpp | ||
| group.h | ||
| HACKING.md | ||
| idle_inhibition.cpp | ||
| idle_inhibition.h | ||
| input.cpp | ||
| input.h | ||
| input_event.cpp | ||
| input_event.h | ||
| input_event_spy.cpp | ||
| input_event_spy.h | ||
| internal_client.cpp | ||
| internal_client.h | ||
| keyboard_input.cpp | ||
| keyboard_input.h | ||
| keyboard_layout.cpp | ||
| keyboard_layout.h | ||
| keyboard_layout_switching.cpp | ||
| keyboard_layout_switching.h | ||
| keyboard_repeat.cpp | ||
| keyboard_repeat.h | ||
| killwindow.cpp | ||
| killwindow.h | ||
| kwin.kcfg | ||
| kwin.notifyrc | ||
| kwinbindings.cpp | ||
| KWinDBusInterfaceConfig.cmake.in | ||
| layers.cpp | ||
| linux_dmabuf.cpp | ||
| linux_dmabuf.h | ||
| logind.cpp | ||
| logind.h | ||
| main.cpp | ||
| main.h | ||
| main_wayland.cpp | ||
| main_wayland.h | ||
| main_x11.cpp | ||
| main_x11.h | ||
| Mainpage.dox | ||
| manage.cpp | ||
| Messages.sh | ||
| modifier_only_shortcuts.cpp | ||
| modifier_only_shortcuts.h | ||
| moving_client_x11_filter.cpp | ||
| moving_client_x11_filter.h | ||
| netinfo.cpp | ||
| netinfo.h | ||
| onscreennotification.cpp | ||
| onscreennotification.h | ||
| options.cpp | ||
| options.h | ||
| org.kde.kappmenu.xml | ||
| org.kde.kwin.ColorCorrect.xml | ||
| org.kde.kwin.Compositing.xml | ||
| org.kde.kwin.Effects.xml | ||
| org.kde.kwin.OrientationSensor.xml | ||
| org.kde.KWin.Session.xml | ||
| org.kde.KWin.VirtualDesktopManager.xml | ||
| org.kde.KWin.xml | ||
| orientation_sensor.cpp | ||
| orientation_sensor.h | ||
| osd.cpp | ||
| osd.h | ||
| outline.cpp | ||
| outline.h | ||
| outputscreens.cpp | ||
| outputscreens.h | ||
| overlaywindow.cpp | ||
| overlaywindow.h | ||
| placement.cpp | ||
| placement.h | ||
| platform.cpp | ||
| platform.h | ||
| pointer_input.cpp | ||
| pointer_input.h | ||
| popup_input_filter.cpp | ||
| popup_input_filter.h | ||
| README.md | ||
| rootinfo_filter.cpp | ||
| rootinfo_filter.h | ||
| rules.cpp | ||
| rules.h | ||
| scene.cpp | ||
| scene.h | ||
| screenedge.cpp | ||
| screenedge.h | ||
| screenlockerwatcher.cpp | ||
| screenlockerwatcher.h | ||
| screens.cpp | ||
| screens.h | ||
| settings.kcfgc | ||
| shadow.cpp | ||
| shadow.h | ||
| shortcutdialog.ui | ||
| sm.cpp | ||
| sm.h | ||
| tabletmodemanager.cpp | ||
| tabletmodemanager.h | ||
| TESTING.md | ||
| thumbnailitem.cpp | ||
| thumbnailitem.h | ||
| toplevel.cpp | ||
| toplevel.h | ||
| touch_hide_cursor_spy.cpp | ||
| touch_hide_cursor_spy.h | ||
| touch_input.cpp | ||
| touch_input.h | ||
| udev.cpp | ||
| udev.h | ||
| unmanaged.cpp | ||
| unmanaged.h | ||
| useractions.cpp | ||
| useractions.h | ||
| utils.cpp | ||
| utils.h | ||
| virtual_terminal.cpp | ||
| virtual_terminal.h | ||
| virtualdesktops.cpp | ||
| virtualdesktops.h | ||
| virtualdesktopsdbustypes.cpp | ||
| virtualdesktopsdbustypes.h | ||
| virtualkeyboard.cpp | ||
| virtualkeyboard.h | ||
| virtualkeyboard_dbus.cpp | ||
| virtualkeyboard_dbus.h | ||
| was_user_interaction_x11_filter.cpp | ||
| was_user_interaction_x11_filter.h | ||
| wayland_cursor_theme.cpp | ||
| wayland_cursor_theme.h | ||
| wayland_server.cpp | ||
| wayland_server.h | ||
| window_property_notify_x11_filter.cpp | ||
| window_property_notify_x11_filter.h | ||
| workspace.cpp | ||
| workspace.h | ||
| x11client.cpp | ||
| x11client.h | ||
| x11eventfilter.cpp | ||
| x11eventfilter.h | ||
| xcbutils.cpp | ||
| xcbutils.h | ||
| xdgshellclient.cpp | ||
| xdgshellclient.h | ||
| xkb.cpp | ||
| xkb.h | ||
| xkb_qt_mapping.h | ||
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.
Contacting KWin development team
- mailing list: kwin@kde.org
- IRC: #kwin on freenode
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.
Developing on KWin
Please refer to hacking documentation for how to build and start KWin. Further information about KWin's test suite can be found in TESTING.md.
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.