Introduce webp_uploads_get_content_image_mimes() to get content image MIME replacement rules

modules/images/webp-uploads/helper.php

@@ -241,6 +241,36 @@ function webp_uploads_get_attachment_sources( $attachment_id, $size = 'thumbnail
 	return array();
 }
 
+/**
+ * Returns mime types that should be used for an image in the specific context.
+ *
+ * @since n.e.x.t
+ *
+ * @param int    $attachment_id The attachment ID.
+ * @param string $context       The current context.
+ * @return array Mime types to use for the image.
+ */
+function webp_uploads_get_content_image_mimes( $attachment_id, $context ) {
+	$target_mimes = array( 'image/webp', 'image/jpeg' );
+
+	/**
+	 * Filters mime types that should be used to update all images in the content. The order of
+	 * mime types matters. The first mime type in the list will be used if it is supported by an image.
+	 *
+	 * @since 1.0.0
+	 *
+	 * @param array  $target_mimes  The list of mime types that can be used to update images in the content.
+	 * @param int    $attachment_id The attachment ID.
+	 * @param string $context       The current context.
+	 */
+	$target_mimes = apply_filters( 'webp_uploads_content_image_mimes', $target_mimes, $attachment_id, $context );
+	if ( ! is_array( $target_mimes ) ) {
+		$target_mimes = array();
+	}
+
+	return $target_mimes;
+}
+
 /**
  * Check whether the additional image is larger than the original image.
  *

modules/images/webp-uploads/load.php

@@ -507,23 +507,10 @@ function webp_uploads_img_tag_update_mime_type( $original_image, $context, $atta
 		return $image;
 	}
 
-	/**
-	 * Filters mime types that should be used to update all images in the content. The order of
-	 * mime types matters. The first mime type in the list will be used if it is supported by an image.
-	 *
-	 * @since 1.0.0
-	 *
-	 * @param array  $target_mimes  The list of mime types that can be used to update images in the content.
-	 * @param int    $attachment_id The attachment ID.
-	 * @param string $context       The current context.
-	 */
-	$target_mimes = apply_filters( 'webp_uploads_content_image_mimes', array( 'image/webp', 'image/jpeg' ), $attachment_id, $context );
-
-	// Get the original mime type for comparison.
 	$original_mime = get_post_mime_type( $attachment_id );
+	$target_mimes  = webp_uploads_get_content_image_mimes( $attachment_id, $context );
 
 	foreach ( $target_mimes as $target_mime ) {
-
 		if ( $target_mime === $original_mime ) {
 			continue;
 		}
@@ -568,7 +555,6 @@ function webp_uploads_img_tag_update_mime_type( $original_image, $context, $atta
 		}
 
 		foreach ( $target_mimes as $target_mime ) {
-
 			if ( $target_mime === $original_mime ) {
 				continue;
 			}
@@ -598,7 +584,6 @@ function webp_uploads_img_tag_update_mime_type( $original_image, $context, $atta
 	}
 
 	foreach ( $target_mimes as $target_mime ) {
-
 		if ( $target_mime === $original_mime ) {
 			continue;
 		}