[OpenLayers-Trac] [OpenLayers] #3419: Tile simplifications

[OpenLayers]

#3419: Tile simplifications
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 Reporter:  ahocevar  |       Owner:  ahocevar    
     Type:  feature   |      Status:  new         
 Priority:  minor     |   Milestone:  2.12 Release
Component:  Tile      |     Version:  2.10        
 Keywords:            |       State:              
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 Currently, Tile.Image instances create a clone of itself for the
 backbuffer tile. This requires a clone method. Since Tile.Google we have
 another Tile implementation that could use backbuffer capabilities, but is
 not a subclass of Tile.Image.

 This tickets suggests simplifying the Tile.Image class, removing the clone
 method from the Tile interface, handling backbuffers by methods of the
 class itself instead of creating a clone, and factoring out common
 backbuffer and image related functionality into a mixin that could also be
 used by Tile.Google and other classes.

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