Opened 14 years ago
Closed 14 years ago
#2300 closed bug (fixed)
Rendering of GRASS RGB composites takes ages
| Reported by: | juanelz | Owned by: | rugginoso |
|---|---|---|---|
| Priority: | major: does not work as expected | Milestone: | Version 1.5.0 |
| Component: | GRASS | Version: | Trunk |
| Keywords: | Cc: | ||
| Must Fix for Release: | Yes | Platform: | Windows |
| Platform Version: | Awaiting user input: | no |
Description
Using qgis Trunk 1.4.0-80 on Windows XP and Grass tools plugin 1.0.2-2 rendering of GRASS rgb composites (created with r.composite) in the map canvas takes very long. After every zoom or pan the extremly slow rendering starts again. This bug seems to be related to https://trac.osgeo.org/qgis/ticket/1816). In qgis version "Metis" 0.11 the performance of rendering GRASS rasters and composites was very fast.
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This should be fixed by new GRASS raster provider in r12880 , the color table is applied in GRASS module and only colored picture is sent to QGIS. It should not be slower then GRASS.
When GDAL was used to render GRASS rasters, the color table was passed as metadata, if there were too many colors it could have become slow.
Please test.