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<title>[35594] trunk/src/wp-includes/theme.php: Responsive images: add template helper functions to generate the tag for a (responsive) header image that includes srcset and sizes attributes.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/35594">35594</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/35594","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>azaozz</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2015-11-10 01:16:16 +0000 (Tue, 10 Nov 2015)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Responsive images: add template helper functions to generate the tag for a (responsive) header image that includes srcset and sizes attributes.
Props Otto42, joemcgill, DH-Shredder, azaozz.
Fixes <a href="https://core.trac.wordpress.org/ticket/21389">#21389</a>.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesthemephp">trunk/src/wp-includes/theme.php</a></li>
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<h3>Diff</h3>
<a id="trunksrcwpincludesthemephp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/theme.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/theme.php 2015-11-10 00:43:01 UTC (rev 35593)
+++ trunk/src/wp-includes/theme.php 2015-11-10 01:16:16 UTC (rev 35594)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -994,6 +994,85 @@
</span><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px">
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ * 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->url ) ) {
+ return '';
+ }
+
+ $width = absint( $header->width );
+ $height = absint( $header->height );
+
+ $attr = wp_parse_args(
+ $attr,
+ array(
+ 'src' => $header->url,
+ 'width' => $width,
+ 'height' => $height,
+ 'alt' => get_bloginfo( 'name' ),
+ )
+ );
+
+ // Generate 'srcset' and 'sizes' if not already present.
+ if ( empty( $attr['srcset'] ) && ! empty( $header->attachment_id ) ) {
+ $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 );
+}
+
+/**
</ins><span class="cx" style="display: block; padding: 0 10px"> * Get random header image data from registered images in theme.
</span><span class="cx" style="display: block; padding: 0 10px"> *
</span><span class="cx" style="display: block; padding: 0 10px"> * @since 3.4.0
</span></span></pre>
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