[OpenLayers-Trac] [OpenLayers] #3266: cache external graphic images in the canvas renderer

[OpenLayers]

#3266: cache external graphic images in the canvas renderer
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 Reporter:  tschaub          |       Owner:  crschmidt   
     Type:  feature          |      Status:  new         
 Priority:  minor            |   Milestone:  2.12 Release
Component:  Renderer.Canvas  |     Version:  2.10        
 Keywords:                   |       State:              
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 Currently, we create a new {{{Image}}} instance for every feature that is
 drawn with an external graphic.  I think it is safe to assume that the
 number of different image source URLs will be small enough that we could
 be caching images by URL.  If we don't think this is a safe assumption, we
 could limit the cache size.

 The benefit would be that we could avoid the flash we get by waiting for
 image {{{onload}}} to be called before rendering the image on the canvas.

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Ticket URL: <http://trac.openlayers.org/ticket/3266>
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A free AJAX map viewer