From 56869baaadb5c32cf5e77b592636e8fce0ca699a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=BCrg=20Lehni?= <juerg@scratchdisk.com>
Date: Thu, 7 Jan 2016 22:07:26 +0100
Subject: [PATCH] Only transform canvas if matrix is not the identity.

---
 src/basic/Matrix.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/basic/Matrix.js b/src/basic/Matrix.js
index 7ebf141f..00fe8a6e 100644
--- a/src/basic/Matrix.js
+++ b/src/basic/Matrix.js
@@ -757,7 +757,10 @@ var Matrix = Base.extend(/** @lends Matrix# */{
      * @param {CanvasRenderingContext2D} ctx
      */
     applyToContext: function(ctx) {
-        ctx.transform(this._a, this._c, this._b, this._d, this._tx, this._ty);
+        if (!this.isIdentity()) {
+            ctx.transform(this._a, this._c, this._b, this._d,
+                    this._tx, this._ty);
+        }
     }
 }, Base.each(['a', 'c', 'b', 'd', 'tx', 'ty'], function(name) {
     // Create getters and setters for all internal attributes.