I know, you can only use the magic pink by default. This is why I am not asking anything about the built in functions.
Like i said before, there will be the map that looks all pretty, and then a colored mask for that map. To explain in more detail, the colored mask has different colors to specify what's going on. For example, anything that is black is solid, anything that is grey is destroyable, anything that is red is insta-death, anything that is white is free space. I am horrible about explaining things, so here is a diagram i found:
that should pretty much explain it. See how the mask is multicolored? Basically i want to use the mask as a cookie cutter. Any pixel on the mask that is white, don't draw it when displaying the map. there are two bitmaps- a mask and a map. The map isn't manipulated at all at runtime, only the mask. Does this make more sense?
Thank you for all your responses.