Function sdl2_sys::SDL_GetRenderDrawColor

pub unsafe extern "C" fn SDL_GetRenderDrawColor(
    renderer: *mut SDL_Renderer,
    r: *mut Uint8,
    g: *mut Uint8,
    b: *mut Uint8,
    a: *mut Uint8
) -> c_int

\brief Get the color used for drawing operations (Rect, Line and Clear).

\param renderer The renderer from which drawing color should be queried. \param r A pointer to the red value used to draw on the rendering target. \param g A pointer to the green value used to draw on the rendering target. \param b A pointer to the blue value used to draw on the rendering target. \param a A pointer to the alpha value used to draw on the rendering target, usually ::SDL_ALPHA_OPAQUE (255).

\return 0 on success, or -1 on error