[Qgis-developer] patch for qgsrasterlayer.cpp

[Marco Hugentobler]

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
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