From 8284a1f6ae3b6ea8f5ca8abbd537aae976620d1c Mon Sep 17 00:00:00 2001
From: antpb <antpb@git.wordpress.org>
Date: Thu, 20 May 2021 22:15:56 +0000
Subject: [PATCH] Media: Introduces `image_editor_output_format` filter for
 setting default MIME type of sub size image output.

This change introduces the `image_editor_output_format` filter, which fires as sub size images are generated allowing to define a default image MIME type for those items.

Props adamsilverstein, williampatton, spacedmonkey, mikeschroder, hellofromTonya, justinahinon, Boniu91, antpb, SergeyBiryukov.
Fixes #52867.


Built from https://develop.svn.wordpress.org/trunk@50943


git-svn-id: http://core.svn.wordpress.org/trunk@50552 1a063a9b-81f0-0310-95a4-ce76da25c4cd
---
 wp-includes/class-wp-image-editor.php | 31 +++++++++++++++++++++++++++
 wp-includes/version.php               |  2 +-
 2 files changed, 32 insertions(+), 1 deletion(-)

diff --git a/wp-includes/class-wp-image-editor.php b/wp-includes/class-wp-image-editor.php
index 7dcdc91d5a..d322d6a7cb 100644
--- a/wp-includes/class-wp-image-editor.php
+++ b/wp-includes/class-wp-image-editor.php
@@ -316,6 +316,37 @@ abstract class WP_Image_Editor {
 			$new_ext   = $file_ext;
 		}
 
+		/**
+		 * Filters the image editor output format mapping.
+		 *
+		 * Enables filtering the mime type used to save images. By default,
+		 * the mapping array is empty, so the mime type matches the source image.
+		 *
+		 * @see src/wp-includes/class-wp-image-editor.php -> get_output_format()
+		 *
+		 * @since 5.8.0
+		 *
+		 * @param array $wp_image_editor_output_format {
+		 *     An array of mime type mappings. Maps a source mime type to a new
+		 *     destination mime type. Empty by default.
+		 *
+		 *     @type array $mime_type The source mime type {
+		 *         @type string $mime_type The new mime type.
+		 *     }
+		 * @param string $filename Path to the image.
+		 * @param string $mime_type The source image mime type.
+		 * }
+		 */
+		$wp_image_editor_output_format = apply_filters( 'image_editor_output_format', array(), $filename, $mime_type );
+
+		if (
+			isset( $wp_image_editor_output_format[ $mime_type ] ) &&
+			$this->supports_mime_type( $wp_image_editor_output_format[ $mime_type ] )
+		) {
+			$mime_type = $wp_image_editor_output_format[ $mime_type ];
+			$new_ext = $this->get_extension( $mime_type );
+		}
+
 		// Double-check that the mime-type selected is supported by the editor.
 		// If not, choose a default instead.
 		if ( ! $this->supports_mime_type( $mime_type ) ) {
diff --git a/wp-includes/version.php b/wp-includes/version.php
index d1529ce553..590543e20a 100644
--- a/wp-includes/version.php
+++ b/wp-includes/version.php
@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.8-alpha-50942';
+$wp_version = '5.8-alpha-50943';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.