The rendering context.
A pointer filled in with the red value used to draw on the rendering target.
A pointer filled in with the green value used to draw on the rendering target.
A pointer filled in with the blue value used to draw on the rendering target.
A pointer filled in with the alpha value used to draw on the rendering 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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Get the color used for drawing operations (Rect, Line and Clear).