From ce64821500208926b273e88c2f09f908238aa63b Mon Sep 17 00:00:00 2001
From: Fluffy-Bean <michal-gdula@protonmail.com>
Date: Wed, 5 Apr 2023 11:50:05 +0000
Subject: [PATCH] Check for webp image support

---
 gallery/static/js/pre/main.js | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/gallery/static/js/pre/main.js b/gallery/static/js/pre/main.js
index 11a1163..f1190b3 100644
--- a/gallery/static/js/pre/main.js
+++ b/gallery/static/js/pre/main.js
@@ -1,3 +1,11 @@
+let webpSupport = false;
+try {
+    new Image().src = 'data:image/webp;base64,UklGRiQAAABXRUJQVlA4IBgAAAAwAQCdASoBAAEAAwA0JaQAA3AA/vuUAAA=';
+    webpSupport = true;
+} catch (e) {
+    webpSupport = false;
+}
+
 // fade in images
 function imgFade(obj, time = 250) {
     obj.style.transition = `opacity ${time}ms`;
@@ -10,7 +18,11 @@ function loadOnView() {
     for (let i = 0; i < lazyLoad.length; i++) {
         let image = lazyLoad[i];
         if (image.getBoundingClientRect().top < window.innerHeight && image.getBoundingClientRect().bottom > 0) {
-            if (!image.src) { image.src = image.getAttribute('data-src') }
+            if (!image.src && webpSupport) {
+                image.src = image.getAttribute('data-src') + '&e=webp'
+            } else if (!image.src) {
+                image.src = image.getAttribute('data-src')
+            }
         }
     }
 }