Media: Introduce filters to customize the results from `wp_get_loading_optimization_attributes()`.

This changeset introduces two filters that allow customizing the loading optimization attributes array returned from `wp_get_loading_optimization_attributes()` for individual HTML tags:
* The `wp_get_loading_optimization_attributes` filter can be used to modify the results from the WordPress core logic.
* The `pre_wp_get_loading_optimization_attributes` filter can be used to use entirely custom logic and effectively short-circuit the core function.

Props pereirinha, mukesh27, spacedmonkey, joemcgill.
Fixes #58893.

Built from https://develop.svn.wordpress.org/trunk@56651


git-svn-id: http://core.svn.wordpress.org/trunk@56163 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/media.php

@@ -5625,6 +5625,25 @@ function wp_get_webp_info( $filename ) {
 function wp_get_loading_optimization_attributes( $tag_name, $attr, $context ) {
 	global $wp_query;
 
+	/**
+	 * Filters whether to short-circuit loading optimization attributes.
+	 *
+	 * Returning an array from the filter will effectively short-circuit the loading of optimization attributes,
+	 * returning that value instead.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param array|false $loading_attrs False by default, or array of loading optimization attributes to short-circuit.
+	 * @param string      $tag_name      The tag name.
+	 * @param array       $attr          Array of the attributes for the tag.
+	 * @param string      $context       Context for the element for which the loading optimization attribute is requested.
+	 */
+	$loading_attrs = apply_filters( 'pre_wp_get_loading_optimization_attributes', false, $tag_name, $attr, $context );
+
+	if ( is_array( $loading_attrs ) ) {
+		return $loading_attrs;
+	}
+
 	$loading_attrs = array();
 
 	/*
@@ -5632,17 +5651,20 @@ function wp_get_loading_optimization_attributes( $tag_name, $attr, $context ) {
 	 * The skip is also applicable for `fetchpriority`.
 	 */
 	if ( 'template' === $context ) {
-		return $loading_attrs;
+		/** This filter is documented in wp-includes/media.php */
+		return apply_filters( 'wp_get_loading_optimization_attributes', $loading_attrs, $tag_name, $attr, $context );
 	}
 
 	// For now this function only supports images and iframes.
 	if ( 'img' !== $tag_name && 'iframe' !== $tag_name ) {
-		return $loading_attrs;
+		/** This filter is documented in wp-includes/media.php */
+		return apply_filters( 'wp_get_loading_optimization_attributes', $loading_attrs, $tag_name, $attr, $context );
 	}
 
 	// For any resources, width and height must be provided, to avoid layout shifts.
 	if ( ! isset( $attr['width'], $attr['height'] ) ) {
-		return $loading_attrs;
+		/** This filter is documented in wp-includes/media.php */
+		return apply_filters( 'wp_get_loading_optimization_attributes', $loading_attrs, $tag_name, $attr, $context );
 	}
 
 	/*
@@ -5654,7 +5676,8 @@ function wp_get_loading_optimization_attributes( $tag_name, $attr, $context ) {
 	 */
 	// TODO: Handle shortcode images together with the content (see https://core.trac.wordpress.org/ticket/58853).
 	if ( 'the_content' !== $context && 'do_shortcode' !== $context && doing_filter( 'the_content' ) ) {
-		return $loading_attrs;
+		/** This filter is documented in wp-includes/media.php */
+		return apply_filters( 'wp_get_loading_optimization_attributes', $loading_attrs, $tag_name, $attr, $context );
 	}
 
 	/*
@@ -5789,7 +5812,17 @@ function wp_get_loading_optimization_attributes( $tag_name, $attr, $context ) {
 		}
 	}
 
-	return $loading_attrs;
+	/**
+	 * Filters the loading optimization attributes.
+	 *
+	 * @since 6.4.0
+	 *
+	 * @param array  $loading_attrs The loading optimization attributes.
+	 * @param string $tag_name      The tag name.
+	 * @param array  $attr          Array of the attributes for the tag.
+	 * @param string $context       Context for the element for which the loading optimization attribute is requested.
+	 */
+	return apply_filters( 'wp_get_loading_optimization_attributes', $loading_attrs, $tag_name, $attr, $context );
 }
 
 /**

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.4-alpha-56650';
+$wp_version = '6.4-alpha-56651';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.