[QGIS-trac] [Quantum GIS] #3427: Unnecessary rendering overhead

[Quantum GIS]

#3427: Unnecessary rendering overhead
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   Reporter:  jctull            |              Owner:  nobody       
       Type:  enhancement       |             Status:  new          
   Priority:  minor: annoyance  |          Milestone:  Version 1.7.0
  Component:  MapCanvas         |            Version:  Trunk        
   Keywords:                    |   Platform_version:  10.6.6       
   Platform:  OS X              |           Must_fix:  No           
Status_info:  0                 |  
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 When I open the property dialog for both raster and vector layers, I can
 make changes to those properties and hit 'Apply' or 'Save as Default' to
 see the updates on the canvas. If I then hit 'Ok' to close the dialog,
 qgis unnecessarily re-renders that layer on the canvas. On the other hand,
 if I hit 'Cancel', I can skip this overhead on my system.

 Is it possible for the code to flag when a layer has already been rendered
 from either 'Apply' or 'Save as Default' to avoid this duplication of
 rendering? Often this is not noticeable, but on large or complex layers,
 it can be quite severe.

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Ticket URL: <http://trac.osgeo.org/qgis/ticket/3427>
Quantum GIS <http://qgis.org>
Quantum GIS is an Open Source GIS viewer/editor supporting OGR, PostGIS, and GRASS formats