WIP image-capture-source / image-copy-capture

[ids1024]

There may be a benefit to a higher-level API, perhaps something async based, but that probably can go in a different crate.

I still need to fix a few things here and get a working test client.

[HigherOrderLogic]

Hi, I'm interested in this PR. From what I can see, seems like this one is abandoned. Mind if I open a new one based on your changes?

[ids1024]

The current version of this is in https://github.com/pop-os/cosmic-protocols/tree/main/client-toolkit/src/screencopy, with the addition of a COSMIC-specific protocol for Workspace capture.

It would be good to get this in smithay-client-toolkit though. On the client side it should be easy enough to accommodate extension protocols for new capture sources outside of sctk.

[HigherOrderLogic]

So should I just copy straight from Cctk (minus the Cosmic protocol) or is there any changes you wanna make?

[ids1024]

Originally the cosmic version used a private protocol (before the image-copy-capture protocol was finalized in wayland-protocols, then for a while it supported both until everything was updated.

The way https://github.com/pop-os/cosmic-protocols/blob/main/client-toolkit/src/screencopy/capture_source.rs defines CaptureSourceKind and CaptureSource doesn't quite work if we want it to be extensible, so the API for capture sources needs to be a bit different. But shouldn't be that complicated.