the window that will be associated with the barrier.
a rectangle area in window-relative coordinates. If NULL the barrier for the specified window will be destroyed.
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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Confines the cursor to the specified area of a window.
Note that this does NOT grab the cursor, it only defines the area a cursor is restricted to when the window has mouse focus.