# clear_this_frame is a list of rectangles which have been drawn over
# static_blits is a dict where keys are strings (for another purpose), value is a
# (surface,rect) tuple. I want to redraw each surface in the area that each i in clear_this_frame
# has overlapped with them.
    for i in clear_this_frame:
        b = background.subsurface(i)
        screen.blit(b, i)
        for surface,position in static_blits.itervalues():
            if position.colliderect(i):
                screen.blit(surface, position.clip(i))