From 3f6e6169afae61dd38bcffdb992c3b8097e13042 Mon Sep 17 00:00:00 2001
From: Tom Payne <twpayne@gmail.com>
Date: Sat, 12 Jan 2013 19:24:20 +0100
Subject: [PATCH] Hide canvas when map is not defined

---
 src/ol/renderer/webgl/webglmaprenderer.js | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/src/ol/renderer/webgl/webglmaprenderer.js b/src/ol/renderer/webgl/webglmaprenderer.js
index 8c5dfbd258..758da3768e 100644
--- a/src/ol/renderer/webgl/webglmaprenderer.js
+++ b/src/ol/renderer/webgl/webglmaprenderer.js
@@ -492,9 +492,10 @@ ol.renderer.webgl.Map.prototype.renderFrame = function(frameState) {
   var gl = this.getGL();
 
   if (goog.isNull(frameState)) {
-    gl.bindFramebuffer(goog.webgl.FRAMEBUFFER, null);
-    gl.clearColor(0, 0, 0, 0);
-    gl.clear(goog.webgl.COLOR_BUFFER_BIT);
+    if (this.renderedVisible_) {
+      goog.style.showElement(this.canvas_, false);
+      this.renderedVisible_ = false;
+    }
     return false;
   }
 
@@ -572,6 +573,11 @@ ol.renderer.webgl.Map.prototype.renderFrame = function(frameState) {
     gl.drawArrays(goog.webgl.TRIANGLE_STRIP, 0, 4);
   }, this);
 
+  if (!this.renderedVisible_) {
+    goog.style.showElement(this.canvas_, true);
+    this.renderedVisible_ = true;
+  }
+
 };