From db068d59c93bda1395770ca428a51fc90250dbe7 Mon Sep 17 00:00:00 2001
From: Andrea Bogazzi <andreabogazzi79@gmail.com>
Date: Wed, 24 Feb 2016 08:45:15 +0100
Subject: [PATCH] enlarge shadow if retina scaling is active

---
 src/shapes/object.class.js | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/shapes/object.class.js b/src/shapes/object.class.js
index 51314cb0..f6c327ba 100644
--- a/src/shapes/object.class.js
+++ b/src/shapes/object.class.js
@@ -1109,7 +1109,10 @@
 
       var multX = (this.canvas && this.canvas.viewportTransform[0]) || 1,
           multY = (this.canvas && this.canvas.viewportTransform[3]) || 1;
-
+      if (this._isRetinaScaling()) {
+        multX *= fabric.devicePixelRatio;
+        multY *= fabric.devicePixelRatio;
+      }
       ctx.shadowColor = this.shadow.color;
       ctx.shadowBlur = this.shadow.blur * (multX + multY) * (this.scaleX + this.scaleY) / 4;
       ctx.shadowOffsetX = this.shadow.offsetX * multX * this.scaleX;