From dfffbeec4689a62fb8f988ea1b5942c7bf3b3e8e Mon Sep 17 00:00:00 2001
From: kurros <wade@ezri.org>
Date: Sat, 2 Jan 2016 12:14:48 -0500
Subject: [PATCH] optimize what gets passed to emojione.unicodeToImage

---
 js/filters.js | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/js/filters.js b/js/filters.js
index 46fa02e..e51f0a2 100644
--- a/js/filters.js
+++ b/js/filters.js
@@ -161,7 +161,14 @@ weechat.filter('getBufferQuickKeys', function () {
 weechat.filter('emojify', function() {
     return function(text, enable_JS_Emoji) {
         if (enable_JS_Emoji === true && window.emojione !== undefined) {
-            return emojione.unicodeToImage(text);
+            // Emoji live in the D800-DFFF surrogate plane; only bother passing
+            // this range to CPU-expensive unicodeToImage();
+            var emojiRegex = /[\uD800-\uDBFF][\uDC00-\uDFFF]/g;
+            if (emojiRegex.test(text)) {
+                return emojione.unicodeToImage(text);
+            } else {
+                return(text);
+            }
         } else {
             return(text);
         }