From 8d3a0c2b0ddf9a964a000f361f17606d7ec0c4eb Mon Sep 17 00:00:00 2001
From: Niklas von Hertzen <niklasvh@gmail.com>
Date: Thu, 24 May 2012 14:10:40 +0300
Subject: [PATCH] cache computed style

---
 src/Core.js | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/Core.js b/src/Core.js
index 86e1a73..77ac27c 100644
--- a/src/Core.js
+++ b/src/Core.js
@@ -8,6 +8,8 @@
 "use strict";
 
 var _html2canvas = {},
+previousElement,
+computedCSS,
 html2canvas;
 
 
@@ -106,7 +108,10 @@ _html2canvas.Util.getCSS = function (el, attribute) {
     
     
     if ( window.getComputedStyle ) {
-        val = document.defaultView.getComputedStyle(el, null)[ attribute ];
+        if ( previousElement !== el ) {
+            computedCSS = document.defaultView.getComputedStyle(el, null);
+        }
+        val = computedCSS[ attribute ];
         
         if ( attribute === "backgroundPosition" ) {