From 73df93969a28efe6e98459a38564ca77295afe62 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=C3=89ric=20Lemoine?= <eric.lemoine@gmail.com>
Date: Fri, 22 Aug 2014 18:09:46 +0200
Subject: [PATCH] No composeFrame if layer and view don't intersect

ol.renderer.canvas.TileLayer#prepareFrame immediately returns false if the layer extent and the view extent do not intersect.
---
 src/ol/renderer/canvas/canvastilelayerrenderer.js | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/ol/renderer/canvas/canvastilelayerrenderer.js b/src/ol/renderer/canvas/canvastilelayerrenderer.js
index 1589e1b662..c30acb9aab 100644
--- a/src/ol/renderer/canvas/canvastilelayerrenderer.js
+++ b/src/ol/renderer/canvas/canvastilelayerrenderer.js
@@ -197,6 +197,10 @@ ol.renderer.canvas.TileLayer.prototype.prepareFrame =
   if (goog.isDef(layerState.extent)) {
     extent = ol.extent.getIntersection(extent, layerState.extent);
   }
+  if (ol.extent.isEmpty(extent)) {
+    // Return false to prevent the rendering of the layer.
+    return false;
+  }
 
   var tileRange = tileGrid.getTileRangeForExtentAndResolution(
       extent, tileResolution);