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xdg-pip: Add new protocol

Vlad Zahorodnii requested to merge zzag/wayland-protocols:xdg-pip into main

This protocol allows applications that display media contents create picture-in-picture windows.

xdg_toplevel surfaces are not suitable for picture-in-picture windows because they need to be excluded from listing in the taskbar or docks and be placed above all other windows. Besides that, the compositor may need to apply a different placement policy for pip windows, for example placing them in the bottom right screen corner, etc.

xdg_pip is built on top of xdg_surface because it gives us support for client-side drop shadows out of the box.

Similar to ordinary toplevels, picture-in-picture windows can be moved and resized.

Signed-off-by: Vlad Zahorodnii

Closes #44

Open questions:

  • Should it be part of the xdg-shell protocol?
    No. Having the picture-in-picture surface role defined in a separate protocol is a more flexible design, for example it allows us to supersede the pip protocol with something else if needed without affecting the xdg-shell protocol.
Edited by Vlad Zahorodnii

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