[OpenLayers-Trac] Re: [OpenLayers] #3419: Tile simplifications and partial rewrite

OpenLayers trac-20090302 at openlayers.org
Tue Aug 9 17:26:31 EDT 2011

#3419: Tile simplifications and partial rewrite
 Reporter:  ahocevar  |       Owner:  ahocevar    
     Type:  feature   |      Status:  new         
 Priority:  minor     |   Milestone:  2.12 Release
Component:  Tile      |     Version:  2.10        
 Keywords:            |       State:  Review      
Changes (by ahocevar):

  * state:  Needs More Work => Review


 I was able to fix this issue. It occurred when a tile was newly created.
 The updateBackBuffer method is called on the tile's beforedraw event. At
 this point, isLoading is not yet true, but the tile is not appended to the
 DOM yet. So the fix (attached as patch to #2897, sorry for that, but the
 code is easier to read there) is to add another check in the
 updateBackBuffers initial if statement:
         var noParent = tile.parentNode !== this.layer.div, // this is new
             needBuffer = ratio != 1 && this.backBufferMode == 1,
             haveImage = tile &&
                 (this.frameless ? tile.src : tile.childNodes.length),
             backBufferUnavailable = !data || !data.tile && this.isLoading;
         if (noParent || needBuffer || !haveImage || backBufferUnavailable)
 Instead of updating this patch as well, I'd kindly ask to review this with
 the latest patch for #2897 applied as well.

Ticket URL: <http://trac.openlayers.org/ticket/3419#comment:15>
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