Ticket #21389: 21389.1.diff

src/wp-includes/theme.php

@@ -994 +994 @@
 }
 
 /**
+ * Create image markup for a custom header image.
+ *
+ * @since 4.4.0
+ *
+ * @param array $attr Optional. Attributes for the image markup. Default empty.
+ * @return string HTML element or empty string on failure.
+ */
+function get_header_image_tag( $attr = array() ) {
+        $header = get_custom_header();
+
+        if ( empty( $header->attachment_id ) || empty( $header->url ) ) {
+                return '';
+        }
+
+        $width = absint( $header->width );
+        $height = absint( $header->height );
+
+        $attr = wp_parse_args(
+                $attr,
+                array(
+                        'src' => $header->url,
+                        'width' => $width,
+                        'height' => $height,
+                )
+        );
+
+        // Generate 'srcset' and 'sizes' if not already present.
+        if ( empty( $attr['srcset'] ) ) {
+                $image_meta = get_post_meta( $header->attachment_id, '_wp_attachment_metadata', true );
+                $size_array = array( $width, $height );
+
+                if ( is_array( $image_meta ) ) {
+                        $srcset = wp_calculate_image_srcset( $header->url, $size_array, $image_meta, $header->attachment_id );
+                        $sizes = wp_get_attachment_image_sizes( $size_array, $image_meta, $header->attachment_id, $header->url );
+
+                        if ( $srcset && ( $sizes || ! empty( $attr['sizes'] ) ) ) {
+                                $attr['srcset'] = $srcset;
+
+                                if ( empty( $attr['sizes'] ) ) {
+                                        $attr['sizes'] = $sizes;
+                                }
+                        }
+                }
+        }
+
+        $attr = array_map( 'esc_attr', $attr );
+        $html = '<img';
+
+        foreach ( $attr as $name => $value ) {
+                $html .= ' ' . $name . '="' . $value . '"';
+        }
+
+        $html .= ' />';
+
+        /**
+         * Filter the markup of header images.
+         *
+         * @since 4.4.0
+         *
+         * @param string $html   The HTML markup being filtered.
+         * @param object $header The custom header object returned by 'get_custom_header()'
+         * @param array  $attr   An array of attributes for the image markup.
+         */
+        return apply_filters( 'get_header_image_tag',  $html, $header, $attr );
+}
+
+/**
+ * Display the image markup for a custom header image.
+ *
+ * @since 4.4.0
+ *
+ * @param array $attr Optional. Attributes for the image markup. Default empty.
+ */
+function the_header_image_tag( $attr = array() ) {
+        echo get_header_image_tag( $attr );
+}
+
+/**
  * Get random header image data from registered images in theme.
  *
  * @since 3.4.0