Hi Jason, On Wed, 26 Feb 2014, Jason Ekstrand wrote:
4) Screen sharing and recording. The security discussion on how to allow clients to request screen sharing and things of the like is still going on and I have no intention of solving that question here. Most proposals for screen sharing and capture have been based on weston's screenshooter protocol which allows the screenshooter client to hand a surface to weston that weston then fills with the contents of the screen. While this works for screenshots, there are a lot of race conditions involved in doing it this way. People have also suggested screen sharing protocols. However, these usually involve re-writing most of the wayland protocol in the other (client -> server) direction. For this reason, I propose that, instead of having complicated screen sharing protocols, the screen sharing or recording program simply act as a wayland compositor supporting the fullscreen shell protocol. The primary compositor (the DE) can then spawn the sharing program and connect to it as a client. This way we can use the normal Wayland protocol for communication rather than re-writing it in reverse.
Thanks for this. I've been putting together a prototype using our VNC server - I've implemented the required interfaces along with your new fullscreen shell, and I'm launching it in place of weston from your screen-share module. It appears to be working well.
One query - I notice you've added a "sprawl" option in compositor-wayland, which creates an output for every output in the fullscreen shell compositor. This makes sense in the "system compositor" use cases. But for screen capture you really want the opposite - i.e. the fullscreen shell compositor needs to create an output for each output of the real compositor. I guess we could just connect back to the real compositor and get the output configuration, but there still needs to be some way of connecting this up in screen-share. (At the moment I'm simply creating a single output in my fullscreen shell compositor) Andrew --- Andrew Wedgbury <[email protected]> _______________________________________________ wayland-devel mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/wayland-devel
