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Media: Introduce `wp_img_tag_add_width_and_height_attr()` to add dimension attributes to images. 

Following up on [48170], this changeset moves the new logic to add missing `img` dimension attributes into a separate function that is run first within `wp_filter_content_tags()`. It also adds a utility function `wp_image_src_get_dimensions()` with logic reused from `wp_image_add_srcset_and_sizes()`, and it ensures that `width` and `height` attributes only get added if both of the attributes are missing on the original `img` tag.

This changeset furthermore improves test coverage and separates tests for the different aspects of `img` tag modification.

Props azaozz.
Fixes #50367. See #44427.

Built from https://develop.svn.wordpress.org/trunk@48237


git-svn-id: http://core.svn.wordpress.org/trunk@48006 1a063a9b-81f0-0310-95a4-ce76da25c4cd
This commit is contained in:
Felix Arntz 2020-06-30 19:30:08 +00:00
parent 438d16c69d
commit e92ab44880
2 changed files with 96 additions and 51 deletions
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139
wp-includes/media.php
View File

@ -1491,11 +1491,42 @@ function wp_calculate_image_sizes( $size, $image_src = null, $image_meta = null,
return apply_filters( 'wp_calculate_image_sizes', $sizes, $size, $image_src, $image_meta, $attachment_id );
}
/**
* Determines an image's width and height dimensions based on the source file.
*
* @since 5.5.0
*
* @param string $image_src The image source file.
* @param array $image_meta The image meta data as returned by 'wp_get_attachment_metadata()'.
* @return array|false Array with first element being the width and second element being the height,
* or false if dimensions cannot be determined.
*/
function wp_image_src_get_dimensions( $image_src, $image_meta ) {
$image_filename = wp_basename( $image_src );
if ( wp_basename( $image_meta['file'] ) === $image_filename ) {
return array(
(int) $image_meta['width'],
(int) $image_meta['height'],
);
}
foreach ( $image_meta['sizes'] as $image_size_data ) {
if ( $image_filename === $image_size_data['file'] ) {
return array(
(int) $image_size_data['width'],
(int) $image_size_data['height'],
);
}
}
return false;
}
/**
* Adds 'srcset' and 'sizes' attributes to an existing 'img' element.
*
* @since 4.4.0
* @since 5.5.0 `width` and `height` are now added if not already present.
*
* @see wp_calculate_image_srcset()
* @see wp_calculate_image_sizes()
@ -1526,40 +1557,18 @@ function wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id ) {
return $image;
}
$attr = '';
$width = preg_match( '/ width="([0-9]+)"/', $image, $match_width ) ? (int) $match_width[1] : 0;
$height = preg_match( '/ height="([0-9]+)"/', $image, $match_height ) ? (int) $match_height[1] : 0;
if ( ! $width || ! $height ) {
/*
* If attempts to parse the size value failed, attempt to use the image meta data to match
* the image file name from 'src' against the available sizes for an attachment.
*/
$image_filename = wp_basename( $image_src );
if ( wp_basename( $image_meta['file'] ) === $image_filename ) {
$width = (int) $image_meta['width'];
$height = (int) $image_meta['height'];
if ( $width && $height ) {
$size_array = array( $width, $height );
} else {
foreach ( $image_meta['sizes'] as $image_size_data ) {
if ( $image_filename === $image_size_data['file'] ) {
$width = (int) $image_size_data['width'];
$height = (int) $image_size_data['height'];
break;
}
}
}
if ( ! $width || ! $height ) {
$size_array = wp_image_src_get_dimensions( $image_src, $image_meta );
if ( ! $size_array ) {
return $image;
}
// Add width and height if not present.
$attr .= ' ' . trim( image_hwstring( $width, $height ) );
}
$size_array = array( $width, $height );
$srcset = wp_calculate_image_srcset( $size_array, $image_src, $image_meta, $attachment_id );
if ( $srcset ) {
@ -1573,21 +1582,19 @@ function wp_image_add_srcset_and_sizes( $image, $image_meta, $attachment_id ) {
if ( $srcset && $sizes ) {
// Format the 'srcset' and 'sizes' string and escape attributes.
$attr .= sprintf( ' srcset="%s"', esc_attr( $srcset ) );
$attr = sprintf( ' srcset="%s"', esc_attr( $srcset ) );
if ( is_string( $sizes ) ) {
$attr .= sprintf( ' sizes="%s"', esc_attr( $sizes ) );
}
}
if ( empty( $attr ) ) {
return $image;
}
// Add extra attributes to the image markup.
return preg_replace( '/<img ([^>]+?)[\/ ]*>/', '<img $1' . $attr . ' />', $image );
}
return $image;
}
/**
* Determine whether to add the `loading` attribute to the specified tag in the specified context.
*
@ -1621,8 +1628,9 @@ function wp_lazy_loading_enabled( $tag_name, $context ) {
*
* @since 5.5.0
*
* @see wp_img_tag_add_loading_attr()
* @see wp_img_tag_add_width_and_height_attr()
* @see wp_img_tag_add_srcset_and_sizes_attr()
* @see wp_img_tag_add_loading_attr()
*
* @param string $content The HTML content to be filtered.
* @param string $context Optional. Additional context to pass to the filters.
@ -1676,6 +1684,11 @@ function wp_filter_content_tags( $content, $context = null ) {
foreach ( $images as $image => $attachment_id ) {
$filtered_image = $image;
// Add 'width' and 'height' attributes if applicable.
if ( $attachment_id > 0 && false === strpos( $filtered_image, ' width=' ) && false === strpos( $filtered_image, ' height=' ) ) {
$filtered_image = wp_img_tag_add_width_and_height_attr( $filtered_image, $context, $attachment_id );
}
// Add 'srcset' and 'sizes' attributes if applicable.
if ( $attachment_id > 0 && false === strpos( $filtered_image, ' srcset=' ) ) {
$filtered_image = wp_img_tag_add_srcset_and_sizes_attr( $filtered_image, $context, $attachment_id );
@ -1723,25 +1736,57 @@ function wp_img_tag_add_loading_attr( $image, $context ) {
$value = 'lazy';
}
// Images should have dimension attributes for the `loading` attribute to be added.
if ( false === strpos( $image, ' width=' ) || false === strpos( $image, ' height=' ) ) {
// Images should have source and dimension attributes for the `loading` attribute to be added.
if ( false === strpos( $image, ' src=' ) || false === strpos( $image, ' width=' ) || false === strpos( $image, ' height=' ) ) {
return $image;
}
$quote = null;
// Check if the img tag is valid (has `src` attribute) and get the quote character.
// In almost all cases it will have src and a double quote.
if ( false !== strpos( $image, ' src="' ) ) {
$quote = '"';
} elseif ( preg_match( '/\ssrc\s*=(["\'])/', $image, $matches ) ) {
$quote = $matches[1];
return str_replace( '<img', '<img loading="' . esc_attr( $value ) . '"', $image );
}
if ( $quote ) {
$loading = "loading={$quote}{$value}{$quote}";
return $image;
}
return str_replace( '<img', "<img {$loading}", $image );
/**
* Adds `width` and `height` attributes to an `img` HTML tag.
*
* @since 5.5.0
*
* @param string $image The HTML `img` tag where the attribute should be added.
* @param string $context Additional context to pass to the filters.
* @param int $attachment_id Image attachment ID.
* @return string Converted 'img' element with 'width' and 'height' attributes added.
*/
function wp_img_tag_add_width_and_height_attr( $image, $context, $attachment_id ) {
$image_src = preg_match( '/src="([^"]+)"/', $image, $match_src ) ? $match_src[1] : '';
list( $image_src ) = explode( '?', $image_src );
// Return early if we couldn't get the image source.
if ( ! $image_src ) {
return $image;
}
/**
* Filters whether to add the missing `width` and `height` HTML attributes to the img tag. Default `true`.
*
* Returning anything else than `true` will not add the attributes.
*
* @since 5.5.0
*
* @param bool $value The filtered value, defaults to `true`.
* @param string $image The HTML `img` tag where the attribute should be added.
* @param string $context Additional context about how the function was called or where the img tag is.
* @param int $attachment_id The image attachment ID.
*/
$add = apply_filters( 'wp_img_tag_add_width_and_height_attr', true, $image, $context, $attachment_id );
if ( true === $add ) {
$image_meta = wp_get_attachment_metadata( $attachment_id );
$size_array = wp_image_src_get_dimensions( $image_src, $image_meta );
if ( $size_array ) {
$hw = trim( image_hwstring( $size_array[0], $size_array[1] ) );
return str_replace( '<img', "<img {$hw}", $image );
}
}

2
wp-includes/version.php
View File

@ -13,7 +13,7 @@
*
* @global string $wp_version
*/
$wp_version = '5.5-alpha-48236';
$wp_version = '5.5-alpha-48237';
/**
* Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.