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Media: Ensure that large images before the main query loop are counted towards lazy-loading threshold.

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Following [55318], [55847], and [56142], certain images in the header of the page have received support for potentially receiving `fetchpriority="high"` and having the `loading="lazy"` attribute omitted. However, these images being present did not affect the "content media count" which counts the images towards a certain threshold so that the first ones are not lazy-loaded.

This changeset also increases that count for such header images if they are larger than a certain threshold. The threshold is used to avoid e.g. a header with lots of small images such as icon graphics to skew the lazy-loading behavior.

Props thekt12, spacedmonkey, flixos90.
Fixes #58635.


git-svn-id: https://develop.svn.wordpress.org/trunk@56143 602fd350-edb4-49c9-b593-d223f7449a82
This commit is contained in:
Felix Arntz
2023-07-05 21:36:23 +00:00
parent aee525ee6f
commit ebd03692e6
2 changed files with 64 additions and 0 deletions
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15
src/wp-includes/media.php
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@@ -5588,6 +5588,15 @@ function wp_get_loading_optimization_attributes( $tag_name, $attr, $context ) {
}
return $loading_attributes;
};
// Closure to increase media count for images with certain minimum threshold, mostly used for header images.
$maybe_increase_content_media_count = static function() use ( $attr ) {
/** This filter is documented in wp-admin/includes/media.php */
$wp_min_priority_img_pixels = apply_filters( 'wp_min_priority_img_pixels', 50000 );
// Images with a certain minimum size in the header of the page are also counted towards the threshold.
if ( $wp_min_priority_img_pixels <= $attr['width'] * $attr['height'] ) {
wp_increase_content_media_count();
}
};
$loading_attrs = array();
@@ -5640,11 +5649,15 @@ function wp_get_loading_optimization_attributes( $tag_name, $attr, $context ) {
*/
$header_area = WP_TEMPLATE_PART_AREA_HEADER;
if ( "template_part_{$header_area}" === $context ) {
// Increase media count if there are images in header above a certian minimum size threshold.
$maybe_increase_content_media_count();
return $postprocess( $loading_attrs, true );
}
// The custom header image is always expected to be in the header.
if ( 'get_header_image_tag' === $context ) {
// Increase media count if there are images in header above a certian minimum size threshold.
$maybe_increase_content_media_count();
return $postprocess( $loading_attrs, true );
}
@@ -5671,6 +5684,8 @@ function wp_get_loading_optimization_attributes( $tag_name, $attr, $context ) {
*/
&& did_action( 'get_header' ) && ! did_action( 'get_footer' )
) {
// Increase media count if there are images in header above a certian minimum size threshold.
$maybe_increase_content_media_count();
return $postprocess( $loading_attrs, true );
}
}