On Fri, Aug 24, 2012 at 10:45 PM, Even Rouault <even.roua...@mines-paris.org> wrote: > I've tested the big ECW (1.8 GB, 141970 x 141970) provided by Jukka and could > indeed reproduce a noticable performance issue when simulating picking with my > tiny GDAL python script. In QGIS, the performance was still OK however, a few > hundreds of milliseconds for each picking. It is just when you do a lot of > iterations that you begin to notice the slowness, or if the dataset is really > huge. > > I've fixed that in http://trac.osgeo.org/gdal/ticket/4790 in trunk and 1.9 > branch. So it will be in GDAL 1.9.2. Actually, as I think that the ECW driver > is generally available through a plugin (and not built-in in GDAL DLL), this > could be available sooner if the ECW plugin is rebuilt with the fixed sources.
Thanks, QGIS is now using 2x2 only if following condition is matched: #if !defined(GDAL_VERSION_NUM) || GDAL_VERSION_NUM < 1920 if ( strcmp( GDALGetDriverShortName( GDALGetDatasetDriver( mGdalDataset ) ), "ECW" ) == 0 ) Radim > Best regards, > > Even _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer