On Fri, 2006-04-28 at 05:57 -0700, Kamilche wrote: > > This can also only be used when sprites are not overlapping. > > Uh, not so! If I have a background, then a tree, then a ghost in front > of the tree that's translucent, and something about the tree changes... Yes, that would work. So you draw all sprites every frame, but only build dirty rectangles for the ones that are marked dirty.