From: Evert Timberg <evert.timberg@gmail.com>
Date: Fri, 18 Sep 2015 23:22:54 +0000 (-0400)
Subject: Only store the original device context ratio once
X-Git-Tag: 2.0.0-alpha4~24^2
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=refs%2Fpull%2F1467%2Fhead;p=thirdparty%2FChart.js.git

Only store the original device context ratio once
---

diff --git a/src/core/core.helpers.js b/src/core/core.helpers.js
index 8d6790bf9..02ee89aef 100644
--- a/src/core/core.helpers.js
+++ b/src/core/core.helpers.js
@@ -758,7 +758,7 @@
 				// Store the device pixel ratio so that we can go backwards in `destroy`.
 				// The devicePixelRatio changes with zoom, so there are no guarantees that it is the same
 				// when destroy is called
-				chart.originalDevicePixelRatio = window.devicePixelRatio;
+				chart.originalDevicePixelRatio = chart.originalDevicePixelRatio || window.devicePixelRatio;
 			}
 		},
 		//-- Canvas methods