Hi, I'm working on issue 4819 and noticed that when a feature is selected, the pan is fast even with complex polygons whereas the pan slows down a lot when features are highlighted.
My best guesses for the difference is: 1) pan operation use cached image for rendering in rendereV2 2) rendering style and/or pipeline is sufficiently different to cause delays (this would explain why refresh after pan drag/drop takes 4sec with highlighted feature, while cached image refresh takes only 2sec otherwise) The fix I can think about for this are either: 1) to introduce caching in QgsHighlight (therefore adding substantial complexity to this class). 2) to add the parameter "highlighted" (along with "selected") to QgsFeatureRendererV2::renderFeature and get rid of QgsHighlight altogether (or at least deprecate it). What is the best option: caching in QgsHighlight, modifying renderFeature, or something I did not think about ? Thanks, V. _______________________________________________ Qgis-developer mailing list Qgis-developer@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/qgis-developer
