Diff for WP RSS Images WordPress plugin

Index: wp-content/plugins/wp-rss-images/wp-rss-images.php
===================================================================
--- wp-content/plugins/wp-rss-images/wp-rss-images.php  (revision 538837)
+++ wp-content/plugins/wp-rss-images/wp-rss-images.php  (working copy)
@@ -91,10 +91,23 @@

 }

+/**
+ * Returns a URL to an image in the user uploads directory on this server.
+ *
+ * Developers can hook the wp_rss_image_alternative filter to provide their
+ * own image URL on this server, or hook the wp_rss_image_size filter to
+ * provide a specific size for the featured_image.
+ *
+ * @param string $size Defaults to medium, a WordPress image size added with add_image_size
+ * @return string The URL to an image on this server
+ */
 function wp_rss_img_url($size = 'medium') {
    global $post;
-   if( function_exists ('has_post_thumbnail') && has_post_thumbnail($post->ID)) {
+   if ( $img_url = apply_filters( 'wp_rss_image_alternative', false, $post->ID ) ) {
+       return $img_url;
+   } else if( function_exists ('has_post_thumbnail') && has_post_thumbnail($post->ID)) {
        $thumbnail_id = get_post_thumbnail_id( $post->ID );
+       $size = apply_filters( 'wp_rss_image_size', 'medium', $post->ID );
        if(!empty($thumbnail_id))
        $img = wp_get_attachment_image_src( $thumbnail_id, $size );
    } else {