From 23cba35ea0a9a93e21b249a59f97105230d06c1e Mon Sep 17 00:00:00 2001
From: larissasmith <smithl@familysearch.org>
Date: Thu, 18 May 2017 15:17:02 -0600
Subject: [PATCH] Clamp device pixel ratio to a minimum of 1 for calculating
 pixelDensityRatio. A lower value can cause tile drawing issues.

---
 src/openseadragon.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/openseadragon.js b/src/openseadragon.js
index a470de14..ca81739c 100644
--- a/src/openseadragon.js
+++ b/src/openseadragon.js
@@ -880,7 +880,7 @@ function OpenSeadragon( options ){
                                     context.msBackingStorePixelRatio ||
                                     context.oBackingStorePixelRatio ||
                                     context.backingStorePixelRatio || 1;
-            return devicePixelRatio / backingStoreRatio;
+            return Math.max(devicePixelRatio, 1) / backingStoreRatio;
         } else {
             return 1;
         }