I'm not sure if this SDL_Collide library will do what you need, and it doesn't seem to have a perl wrapper, but it seemed worth a mention in any case.

Update: SDL_Collide appears to have been created as a result of this thread of discussion on gamedev.net.

In reply to Re: Some simple 2d game-related maths questions by tod222
in thread Some simple 2d game-related maths questions by skx

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