The rendering context.
The SDL_Rect structure representing the drawing area, or null to set the viewport to the entire target.
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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Set the drawing area for rendering on the current target.
Drawing will clip to this area (separately from any clipping done with SDL_SetRenderClipRect), and the top left of the area will become coordinate (0, 0) for future drawing commands.
The area's width and height must be >= 0.