Zoom with Allegro

Well, this is my first post here.(and sorry for my english)
I want to make a 2D videoame using allegro (i don´t have anything programmed yet)
Im thinking about a RTS game, and I want to make it with "zoom", if it could be, i prefer to use a "continuous zoom" that one by stages (well, i imagine that nobody can understand what i wrote here, so watch a video of "Eufloria", that have a "continuous zoom", but i don´t have idea how to do it, because the maps could be large, so loading a buffer with all the map and resize it its not a good idea.

Also, the level of detail becames higher while you zoom in. I don´t know how to start this... any idea?
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