As an animator specializing in Disney-style animation for videos and movies and whatnot, one of the things I've always wondered about is game animations. I'm especially wondering about it now, because I want to make a 2d game. Since, in 3d games, most animations are re-used, there are (I'm guessing) blending systems in place for automatically making simple transfers between animations, greatly lessening the workload for an animator who won't have to make a bunch of short transition animations.
However, I'm looking for a 2d engine that can do the same thing. I know that, since 2d animated objects aren't bone rigged, it would be difficult to produce the sort of technology I'm suggesting. My question nonetheless is, is there a 2d engine that can take animated 2d objects (be they .swf, or .gif, or a sequence of images) and automatically interpolate in between frames for animation frames? if so, is it easy to use?