From ba9a62120b3ee2769b9f2b905ad2197c70c06479 Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Sat, 14 Jul 2012 19:23:25 +0200
Subject: [PATCH] Only redraw if visible layers are added or removed

---
 src/ol/webgl/map.js | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/ol/webgl/map.js b/src/ol/webgl/map.js
index aaf22aa72f..1a1903a355 100644
--- a/src/ol/webgl/map.js
+++ b/src/ol/webgl/map.js
@@ -107,7 +107,9 @@ ol.webgl.Map.prototype.handleCenterChanged = function() {
  */
 ol.webgl.Map.prototype.handleLayerAdd = function(layer) {
   goog.base(this, 'handleLayerAdd', layer);
-  this.redraw_();
+  if (layer.getVisible()) {
+    this.redraw_();
+  }
 };
 
 
@@ -116,7 +118,9 @@ ol.webgl.Map.prototype.handleLayerAdd = function(layer) {
  */
 ol.webgl.Map.prototype.handleLayerRemove = function(layer) {
   goog.base(this, 'handleLayerRemove', layer);
-  this.redraw_();
+  if (layer.getVisible()) {
+    this.redraw_();
+  }
 };