Screenshot manager: check if rendering pipeline is ready & check if all files have been written to disk

[johnny-smitherson]

I'm using screenshot manager to render the frames for a video/gif.

If I take screenshots the first few frames, they come out blank. Is there a better method to avoid this than hard-coding a number of frames to drop at the beginning?

I'd like to exit as soon as all the screenshots are saved, but I'm not familiar with any method on screenshot manager to return when that happens. If I send the AppExit event as soon as I request save of the last frame, some frames at the end aren't saved at all on disk. So I have to hard-code a number of frames to wait and hope it's big enough for the load on the machine.

Do methods exist somewhere to run these checks and know when we can start recording screenshots? I see another issue on another topic, but that's about the screenshot manager not working at all - it sure is working for me. This is about it not working for a little bit at the beginning, and not knowing how much time to wait at the end.