Comment 31 for bug 1121982

The current approach _doesn't_ do this cropping. It requires all frames in an animation to have the same size. Also, the current method for decomposing the frames could still be used even with the different data format. It is true that figuring out how to best use the full potential of having "regions per frame" is more difficult, but doing so just requires incremental improvements to the make_spritemap scripts; it doesn't require any further changes in the renderer.