the window to update.
an array of SDL_Rect structures representing areas of the surface to copy, in pixels.
the number of rectangles.
true on success or false on failure; call SDL_GetError() for more information.
Threadsafety: This function should only be called on the main thread.
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Copy areas of the window surface to the screen.
This is the function you use to reflect changes to portions of the surface on the screen.
This function is equivalent to the SDL 1.2 API SDL_UpdateRects().
Note that this function will update _at least_ the rectangles specified, but this is only intended as an optimization; in practice, this might update more of the screen (or all of the screen!), depending on what method SDL uses to send pixels to the system.