[FR]: Support Picture-in-Picture Wayland protocol

[relativemodder]

Description

Picture-in-picture using a dedicated experimental Wayland protocol

Who's implementing?

• I'm willing to implement this feature myself

The problem

Recently I found out that Firefox (and also Zen, LibreWolf, etc.) supports this exact experimental Wayland protocol. But I like Helium more (reason being, it's based on Chromium and supports hardware accelerated video decoding on NVIDIA).

What's the xx-pip-v1 protocol? It is a new protocol designed specifically for creating floating PiP windows, and KWin, Plasma's compositor, recently gained support for it. Because it is an experimental protocol, its use is gated behind an environment variable, KWIN_WAYLAND_SUPPORT_XX_PIP_V1.

A new protocol is fine for demos, but it needs real applications. For example, it's implemented it in KClock. This work allows KClock to offer pop-out timers and even a pop-out stopwatch in a small PiP window.

Possible solutions

Please, give us xx-pip-v1. I know, I know, it's experimental, but it would be nice. Sorry if I'm requesting too much.

Additional context

Protocol in KClock

Protocol in KWin (more recent)

[dumbmoron]

This sounds like something that should be implemented in Chromium, could you please make an issue on https://issues.chromium.org/issues (if there isn't any yet) and link it here? https://issues.chromium.org/issues/409717081 sounds related

[dumbmoron]

approved, with that this should be worked on in upstream, after which we'll pick it up in some major