From 81c0c37eb9193db1167fad0bd11ff04bea2e80e9 Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Sat, 14 Dec 2013 11:34:11 +0100
Subject: [PATCH] Simplify geometries to a tolerance of half a device pixel

---
 src/ol/renderer/canvas/canvasvectorlayerrenderer.js | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/ol/renderer/canvas/canvasvectorlayerrenderer.js b/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
index ef94a0e754..08b78a3a7f 100644
--- a/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
+++ b/src/ol/renderer/canvas/canvasvectorlayerrenderer.js
@@ -237,8 +237,9 @@ ol.renderer.canvas.VectorLayer.prototype.renderFeature =
   if (!goog.isDefAndNotNull(styles)) {
     return false;
   }
-  // simplify to a tolerance of half a CSS pixel
-  var squaredTolerance = resolution * resolution / 4;
+  // simplify to a tolerance of half a device pixel
+  var squaredTolerance =
+      resolution * resolution / (4 * pixelRatio * pixelRatio);
   var i, ii, style, imageStyle, imageState;
   for (i = 0, ii = styles.length; i < ii; ++i) {
     style = styles[i];