Media: Some documentation and test improvements for WebP support:

* Document that WebP constants are only defined in PHP 7.1+.
* Correct the `$filename` parameter type in `wp_get_webp_info()`.
* Use a consistent message when skipping tests due to the lack of WebP support.
* Remove unnecessary `else` branches after `markTestSkipped()`.
* Replace `assertEquals()` with more appropriate assertions.

Follow-up to [50810].

See #35725.
Built from https://develop.svn.wordpress.org/trunk@50814


git-svn-id: http://core.svn.wordpress.org/trunk@50423 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/compat.php

@@ -371,7 +371,7 @@ if ( ! function_exists( 'is_iterable' ) ) {
 	}
 }
 
-// WebP constants may not be defined, even in cases where the format is supported.
+// WebP constants are only defined in PHP 7.1+.
 if ( ! defined( 'IMAGETYPE_WEBP' ) ) {
 	define( 'IMAGETYPE_WEBP', 18 );
 }

wp-includes/functions.php

@@ -3079,9 +3079,11 @@ function wp_get_image_mime( $file ) {
 			return false;
 		}
 
-		// Add WebP fallback detection when image library doesn't support WebP.
-		// Note: detection values come from LibWebP, see
-		// https://github.com/webmproject/libwebp/blob/master/imageio/image_dec.c#L30
+		/*
+		 * Add WebP fallback detection when image library doesn't support WebP.
+		 * Note: detection values come from LibWebP, see
+		 * https://github.com/webmproject/libwebp/blob/master/imageio/image_dec.c#L30
+		 */
 		$magic = bin2hex( $magic );
 		if (
 			// RIFF.

wp-includes/media.php

@@ -5024,7 +5024,7 @@ function wp_getimagesize( $filename, array &$image_info = null ) {
  *
  * @since 5.8.0
  *
- * @param [type] $filename Path to a WebP file.
+ * @param string $filename Path to a WebP file.
  * @return array $webp_info {
  *     An array of WebP image information.
  *
@@ -5038,9 +5038,11 @@ function wp_get_webp_info( $filename ) {
 	$width  = false;
 	$height = false;
 	$type   = false;
+
 	if ( ! 'image/webp' === wp_get_image_mime( $filename ) ) {
 		return compact( 'width', 'height', 'type' );
 	}
+
 	try {
 		$handle = fopen( $filename, 'rb' );
 		if ( $handle ) {
@@ -5083,6 +5085,7 @@ function wp_get_webp_info( $filename ) {
 		}
 	} catch ( Exception $e ) {
 	}
+
 	return compact( 'width', 'height', 'type' );
 }
 
@@ -5097,6 +5100,7 @@ function wp_get_webp_info( $filename ) {
 function _wp_webp_is_lossy( $filename ) {
 	$webp_info = wp_get_webp_info( $filename );
 	$type      = $webp_info['type'];
+
 	return $type && 'lossy' === $type;
 }
 
@@ -5113,11 +5117,13 @@ function _wp_webp_is_lossy( $filename ) {
 function _wp_get_image_size( $filename, &$imageinfo = array() ) {
 	// Try getimagesize() first.
 	$info = getimagesize( $filename, $imageinfo );
+
 	if ( false !== $info ) {
 		return $info;
 	}
-	// For PHP versions that don't support WebP images, extract the image
-	// size info from the file headers.
+
+	// For PHP versions that don't support WebP images,
+	// extract the image size info from the file headers.
 	if ( 'image/webp' === wp_get_image_mime( $filename ) ) {
 		$webp_info = wp_get_webp_info( $filename );
 		$width     = $webp_info['width'];

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-alpha-50813';
+$wp_version = '5.8-alpha-50814';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.