Use this function to check whether a rectangle has no area.
SDL_bool SDL_RectEmpty(const SDL_Rect* r)
the SDL_Rect structure representing the rectangle to check
Returns SDL_TRUE if the rectangle has no area or SDL_FALSE if it does; see Remarks for details.
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If the rectangle defined by r is NULL or has a width or height <= 0 it has no area and this function returns SDL_TRUE. If both width and height are > 0 the rectangle has area and this function returns SDL_FALSE.