[Qgis-developer] patch for qgsrasterlayer.cpp

[Tim Sutton]

Hi Marco

Thanks! There are actually many places we can optimise things. For one
when we have a separate renderer class for each renderer type, we can
avoid a lot of switches...

Peter is now 'Raster Master' so I will defer the patch to him (if
thats ok Peter?).

Regards

Tim

2007/9/28, Marco Hugentobler <marco.hugentobler at karto.baug.ethz.ch>:
> Hi Peter and Tim,
>
> While sitting in the train, I plaied a bit around with the methods
> QgsRasterLayer::drawPallettedMultiBandColor and
> QgsRasterLayer::drawMultiBandColor. I think that some multiplications and
> comparison in the inner loop, which is executed appr. 800000 times during
> each redraw, can be avoided or moved outside the loop. Especially,
> QgsRasterLayer::drawPallettedMultiBandColor was much faster on my PC
> afterwards.
>
> Attached the patch. Please review and test, if I didn't break any existing
> functionality.
>
> Regards,
> Marco
>
>
>
> --
> Dr. Marco Hugentobler
> Institute of Cartography
> ETH Zurich
> Technical Advisor QGIS Project Steering Committee
> marco.hugentobler at karto.baug.ethz.ch
>
>


-- 
Tim Sutton
QGIS Project Steering Committee Member - Release  Manager
Visit http://qgis.org for a great open source GIS
openModeller Desktop Developer
Visit http://openModeller.sf.net for a great open source ecological
niche modelling tool
Home Page: http://tim.linfiniti.com
Skype: timlinux
Irc: timlinux on #qgis at freenode.net