{
			return $vc_image;
		}

		$image = image_get_intermediate_size( $attachment_id, array( $size[1], $size[2] ) );

		if ( $image ) {
			return $vc_image;
		}

		// Smush image. TODO: should we update the stats?
		WP_Smush::get_instance()->core()->mod->smush->do_smushit( $vc_image );

		return $vc_image;
	}

	/**
	 * Replace the image src with cdn link for all the Ajax requests.
	 *
	 * @since 3.9.10
	 *
	 * @see SMUSH-206
	 *
	 * @param array|false $image {
	 *     Array of image data, or boolean false if no image is available.
	 *
	 *     @type string $0 Image source URL.
	 *     @type int    $1 Image width in pixels.
	 *     @type int    $2 Image height in pixels.
	 *     @type bool   $3 Whether the image is a resized image.
	 * }
	 *
	 * @return mixed
	 */
	public function cdn_attachment_image_src( $image ) {
		if ( ! wp_doing_ajax() ) {
			return $image;
		}

		$cdn = WP_Smush::get_instance()->core()->mod->cdn;

		if ( ! $cdn->get_status() ) {
			return $image;
		}

		if ( is_array( $image ) && ! empty( $image[0] ) ) {
			$image[0] = $cdn->generate_cdn_url( $image[0] );
		}

		return $image;
	}

	/**************************************
	 *
	 * PRIVATE CLASSES
	 */

	/**
	 * Should only be active when WPBakery Page Builder is installed.
	 *
	 * @since 3.2.1
	 *
	 * @see https://kb.wpbakery.com/docs/inner-api/vc_disable_frontend
	 */
	private function check_for_js_builder() {
		// This function exists since WPBakery 4.0 (02.03.2014) and is listed
		// on their API docs. It should be stable enough to rely on it.
		$this->enabled = defined( 'WPB_VC_VERSION' ) && function_exists( 'vc_disable_frontend' );
	}

}