[Qgis-developer] Provider native raster band stats

[Tim Sutton]

Hi

During the Lisbon hackfest (between all those meetings!) I worked on
updating the raster providers to be able to generate stats themselves.
The raster provider base class has a default (and historically
inefficient as we all know) implementation for collecting stats by
walking over every cell in the raster twice. This method remains, but
the providers can now supply stats themselves (heopfully using more
efficient mechanisms). I have implemented gdal native stats already.
Over the last few weeks I did some further testing and cleanups to
this work. From my testing some of my worst case files opened in
~1minute rather than ~8+ minutes. It would be great if interested
parties could test (details below) before I put it into master.

git remote add timlinux git://github.com/timlinux/Quantum-GIS.git
git fetch timlinux
git branch --track timlinux raster-stats
git checkout raster-stats

I look forward to your feedback.

Regards

-- 
Tim Sutton - QGIS Project Steering Committee Member (Release  Manager)
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