Ticket #23649: 23649.diff

wp-content/themes/twentythirteen/style.css

@@ -1511 +1511 @@
         width: auto;
 }
 
+.blog .format-gallery .gallery-item .portrait img,
+.archive .format-gallery .gallery-item .portrait img,
+.search .format-gallery .gallery-item .portrait img {
+        height: auto;
+        max-height: 1000%;
+        max-width: 148px;
+        width: 100%;
+}
+
 .blog .format-gallery .gallery-item:first-child,
 .archive .format-gallery .gallery-item:first-child,
 .search .format-gallery .gallery-item:first-child {

wp-content/themes/twentythirteen/functions.php

@@ -486 +486 @@
 endif;
 
 /**
+ * Adds a class to the attachment link so portrait images can be displayed
+ * correctly in the featured gallery.
+ *
+ * @since Twenty Thirteen 1.0
+ *
+ * @param string $link Attachment link
+ * @param int $id Attachment ID
+ * @return string
+ */
+function twentythirteen_get_attachment_link( $link, $id ) {
+
+        if ( has_post_format( 'gallery' ) && ! is_single() ) {
+                $image = wp_get_attachment_metadata( $id );
+                if ( $image['height'] > $image['width'] )
+                        $link = str_replace( '<a ', '<a class="portrait" ', $link );
+        }
+
+        return $link;
+}
+add_filter( 'wp_get_attachment_link', 'twentythirteen_get_attachment_link', 10, 2 );
+
+/**
  * Extends the default WordPress body class to denote:
  * 1. Custom fonts enabled.
  * 2. Single or multiple authors.