From ef874dd347ffc57c42f519f6788c30f2543c5e1f Mon Sep 17 00:00:00 2001
From: Lim Chee Aun <cheeaun@gmail.com>
Date: Sun, 19 Mar 2023 13:38:40 +0800
Subject: [PATCH] More caching for alpha-detecting avatars

---
 src/components/avatar.jsx | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/components/avatar.jsx b/src/components/avatar.jsx
index a9c2d9c4..c2aed8ab 100644
--- a/src/components/avatar.jsx
+++ b/src/components/avatar.jsx
@@ -43,6 +43,7 @@ function Avatar({ url, size, alt = '', ...props }) {
           }}
           onLoad={(e) => {
             if (avatarRef.current) avatarRef.current.dataset.loaded = true;
+            if (alphaCache[url] !== undefined) return;
             try {
               // Check if image has alpha channel
               const canvas = document.createElement('canvas');
@@ -65,8 +66,8 @@ function Avatar({ url, size, alt = '', ...props }) {
               if (hasAlpha) {
                 // console.log('hasAlpha', hasAlpha, allPixels.data);
                 avatarRef.current.classList.add('has-alpha');
-                alphaCache[url] = true;
               }
+              alphaCache[url] = hasAlpha;
             } catch (e) {
               // Ignore
             }