draw_pixel (Imlib2::Image)

    /*
     * Draw a pixel at the specified coordinates.
     *
     * Note: Versions of Imlib2 up to and including 1.0.5 had a broken
     * imlib_image_draw_pixel() call. Imlib2-Ruby has a work-around, which
     * simulates drawing a pixel with a 1x1 rectangle.  To disable this
     * behavior, see the Imlib2::Image::draw_pixel_workaround= method.
     *
     * Examples:
     *   im.draw_pixel 10, 10                      # draw using context color
     *   im.draw_pixel 10, 10, Imlib2::Color::BLUE # draw blue pixel
     *   im.draw_pixel [10, 10], Imlib2::Color::RED # draw red pixel
     *
     */
    static VALUE image_draw_pixel(int argc, VALUE *argv, VALUE self) {