SDL_UpdateRects(3) SDL API Reference SDL_UpdateRects(3)NAME
SDL_UpdateRects- Makes sure the given list of rectangles is updated on
the given screen.
void SDL_UpdateRects(SDL_Surface *screen, int numrects, SDL_Rect
Makes sure the given list of rectangles is updated on the given screen.
The rectangles must all be confined within the screen boundaries (no
clipping is done).
This function should not be called while screen is locked.
It is adviced to call this function only once per frame, since
each call has some processing overhead. This is no restriction
since you can pass any number of rectangles each time.
The rectangles are not automatically merged or checked for over‐
lap. In general, the programmer can use his knowledge about his
particular rectangles to merge them in an efficient way, to
SDL_UpdateRect, SDL_Rect, SDL_Surface, SDL_LockSurface
SDL Tue 11 Sep 2001, 23:01 SDL_UpdateRects(3)