set_image (Imlib2::Context)

    /*
     * Set the current image (Imlib2::Image).
     *
     * Note that this function is not useful at the moment since all image
     * instance methods blindly blow away the image and color context.  So
     * you cannot safely mix image context and image instance methods.
     *
     * Example:
     *   ctx.image = image
     *
     */
    static VALUE ctx_set_image(VALUE self, VALUE val) {