From 54721608a41c249a93a5ccae210c1147b1087ab1 Mon Sep 17 00:00:00 2001
From: Waylon Peng <waylonpeng@gmail.com>
Date: Fri, 12 Mar 2021 23:03:18 -0800
Subject: [PATCH 1/2] Create setImageFormatsSupported function

---
 src/openseadragon.js | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/src/openseadragon.js b/src/openseadragon.js
index f61e0133..e638c750 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -2453,6 +2453,20 @@ function OpenSeadragon( options ){
             extension = extension ? extension : "";
             // eslint-disable-next-line no-use-before-define
             return !!FILEFORMATS[ extension.toLowerCase() ];
+        },
+
+        /**
+         * Updates supported image formats with user-specified values.
+         * @function
+         * @example
+         * // sets webp as supported and png as unsupported
+         * setImageFormatsSupported({webp: true, png: false});
+         * @param {Object} formats An object containing format extensions as
+         * keys and booleans as values.
+         */
+        setImageFormatsSupported: function(formats) {
+            // eslint-disable-next-line no-use-before-define
+            Object.assign(FILEFORMATS, formats);
         }
 
     });

From 1ccefd9f6a2925e656d0387e682f0d8a01078cfc Mon Sep 17 00:00:00 2001
From: Waylon Peng <waylonpeng@gmail.com>
Date: Mon, 15 Mar 2021 16:20:26 -0700
Subject: [PATCH 2/2] Update jsdoc, replace Object.assign with $.extend

---
 src/openseadragon.js | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/src/openseadragon.js b/src/openseadragon.js
index e638c750..b26a152c 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -2457,6 +2457,17 @@ function OpenSeadragon( options ){
 
         /**
          * Updates supported image formats with user-specified values.
+         * Preexisting formats that are not being updated are left unchanged.
+         * By default, the defined formats are
+         * <pre><code>{
+         *      bmp:  false,
+         *      jpeg: true,
+         *      jpg:  true,
+         *      png:  true,
+         *      tif:  false,
+         *      wdp:  false
+         * }
+         * </code></pre>
          * @function
          * @example
          * // sets webp as supported and png as unsupported
@@ -2466,7 +2477,7 @@ function OpenSeadragon( options ){
          */
         setImageFormatsSupported: function(formats) {
             // eslint-disable-next-line no-use-before-define
-            Object.assign(FILEFORMATS, formats);
+            $.extend(FILEFORMATS, formats);
         }
 
     });