[mapguide-trac] #1258: AGG / GD crash when DrawScreenRaster is called with undefined image

[MapGuide Open Source]

#1258: AGG / GD crash when DrawScreenRaster is called with undefined image
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   Reporter:  waltweltonlair     |       Owner:  waltweltonlair
       Type:  defect             |      Status:  new           
   Priority:  low                |   Milestone:  2.3           
  Component:  Rendering Service  |     Version:  2.2.0         
   Severity:  trivial            |    Keywords:                
External_id:                     |  
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 It's possible for !DrawScreenRaster to be called with an unknown image
 type.  In this case AGG and GD should ignore the call.  AGG would crash
 because it would later try to create a renderer with negative width and
 height.  GDRenderer also needs a few additional safety checks.

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Ticket URL: <https://trac.osgeo.org/mapguide/ticket/1258>
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