From 069f4b9bdf8a43a336f1650c5806ec41c3154f2e Mon Sep 17 00:00:00 2001
From: Xiliang Chen <xlchen1291@gmail.com>
Date: Thu, 21 Jan 2016 14:25:39 +1300
Subject: [PATCH] avoid apply transform twice for composite context

---
 src/display/canvas.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/display/canvas.js b/src/display/canvas.js
index 2e8c766074417..6355d73a71302 100644
--- a/src/display/canvas.js
+++ b/src/display/canvas.js
@@ -856,7 +856,10 @@ var CanvasGraphics = (function CanvasGraphicsClosure() {
 
       if (this.transparentCanvas) {
         this.ctx = this.compositeCtx;
+        this.ctx.save();
+        this.ctx.setTransform(1, 0, 0, 1, 0, 0); // Avoid apply transform twice
         this.ctx.drawImage(this.transparentCanvas, 0, 0);
+        this.ctx.restore();
         this.transparentCanvas = null;
       }