title: Scrolling large tile map using cocos2d-x gives me black tiles where there should be green tiles
body: <p>I am loading 400x400 tile map created using Tiled software.
  One tile is 120 pixels for total of 48000x48000 pixels.</p>
  
  <p>I load like this</p>
  
  <pre><code>    regionMap-&gt;initWithTMXFile("background2.tmx");
      mapLayer-&gt;addChild(regionMap, 0, enTagTileMap);
      mapLayer-&gt;setAnchorPoint(CCPoint(0,1));
  </code></pre>
  
  <p>Then I scroll like this.</p>
  
  <pre><code>    mapLayer-&gt;setPosition(position);
  </code></pre>
  
  <p>When I vertically scroll to about this position, I do not get the tiles from the map anymore, I just get black tiles.</p>
  
  <pre><code>    x=0 , y=5483.748535
  </code></pre>
  
  <p>When I horizontally scroll, I do not get the same problem even when I reach this position.</p>
  
  <pre><code>    x=-48000, y=400
  </code></pre>
  
  <p>Thanks for advance.</p>