From f9ea449901bc10c81d564e28af64756c7d6f9c9f Mon Sep 17 00:00:00 2001
From: mrmr1993
Date: Tue, 12 Sep 2017 11:08:49 +0100
Subject: Consider devicePixelRatio when calculating viewport

This should fix #2635, fix #2633 and fix #2620.
---
 lib/dom_utils.coffee | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/dom_utils.coffee b/lib/dom_utils.coffee
index d0bd4615..24747837 100644
--- a/lib/dom_utils.coffee
+++ b/lib/dom_utils.coffee
@@ -293,7 +293,8 @@ DomUtils =
     style = getComputedStyle box
     if style.position == "static" and not /content|paint|strict/.test(style.contain or "")
       zoom = +style.zoom || 1
-      top: Math.ceil(window.scrollY / zoom), left: Math.ceil(window.scrollX / zoom)
+      ratio = window.devicePixelRatio ? 1
+      top: Math.ceil(window.scrollY * ratio / zoom), left: Math.ceil(window.scrollX * ratio / zoom)
     else
       rect = box.getBoundingClientRect()
       top: -rect.top - box.clientTop, left: -rect.left - box.clientLeft
-- 
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