[mapguide-trac] #639: Performance: Tooltips are evaluated unnecessarily when rendering the map image

[MapGuide Open Source]

#639: Performance: Tooltips are evaluated unnecessarily when rendering the map
image
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   Reporter:  chrisclaydon       |       Owner:  chrisclaydon
       Type:  defect             |      Status:  new         
   Priority:  medium             |   Milestone:  2.1         
  Component:  Rendering Service  |     Version:  2.0.1       
   Severity:  minor              |    Keywords:              
External_id:                     |  
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 Various different renderers are used with the default stylizer in order to
 achieve different results, such as rendering the map image, querying
 properties, and determining tooltips and hyperlinks.

 The current code evaluates tooltips for all features on a layer that has a
 tooltip defined, regardless of whether the tooltips are actually required
 by the specified renderer. This results in unnecessary processing overhead
 when the tooltips are not required.

 The fix for this is to add two new virtual methods to the renderers to
 allow them to declare whether or not they support tooltip and hyperlink
 processing. The methods are called !SupportsTooltips() and
 !SupportsHyperlinks() respectively. They default to false, but may be
 overridden in a specific renderer to indicate that the necessary data
 should be processed.

 They will be implemented to return true in the !FeatureInfoRenderer, which
 is used to determine tooltips and hyperlinks.

-- 
Ticket URL: <http://trac.osgeo.org/mapguide/ticket/639>
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