QtCS2017 QtWayland session

Previous year / current status

• Xdg-shell unstable v6 (client + compositor)
  • QT_WAYLAND_SHELL_INTEGRATION, QT_WAYLAND_USE_XDG_SHELL deprecated
  • Default to xdg_shell v6 if present
• Compositor ivi_application support
• Stable since 5.8 (bug fixes, documentation, testing, examples)
  • Multi-screen examples
  • Touch issues
  • Build wthout OpenGL (and also build without other features)
  • Screen enter/leave (clients now know which screen they're on)
• Buffer sharing

Discussion

• Xdg-output
  • Protocol that adds some information about outputs (screens) compared to wl_outputs. We'll probably want to look into this at some point.
• Move Wayland QPA plugin back into qtbase?
  • Qtwaylandscanner would have to be moved as well
  • Some of xdg positioning is shared between client and server
  • xkb classes
  • Client tests belong on some server classes and vice-versa
  • Maybe some of the shared functionality can be moved into a library?
• Xdg-shell final
• Hot-plugging outputs (on the compositor side)
  • Need to merge https://codereview.qt-project.org/#/c/203784/
  • Requires support by the underlying QPA plugin (i.e. eglfs)
• What (not) to do when the protocol is missing functionality?
  • qt_extended_surface
    • Does too many things
    • Was developed for internal use, but picked up by KDE and possibly others, now it's hard to get rid of
  • Disable window decorations
    • We can implement the custom KDE extension. Has been picked up by some other compositors (i.e. sway). Would be great if we could get it into wayland-protocols.
  • Absolute positioning of windows
    • Propose a simple extension to wayland-protocols?
• Implement (unstable) protocols?
  • Tablet support
  • idle-inhibit
    • We would need more public Qt API to make use of this. Most OS's support some way of doing this, so it might make sense.
  • pointer-gestures?
  • pointer-constraints?
    • Might be possible to add some level of support for QCursor::setPos
• Testing
  • Many patches in need of reviews (both client and compositor)
    • xdg shell v6
    • Adding/removing of globals (i.e. outputs, extensions)
  • Would be great to run qtbase tests on Wayland
• Improve hidpi support
• Native-surface created events