Re: [gdal-dev] Get a rough overview image via RasterIO

2008-11-12 Thread Frank Warmerdam
Oliver Eichler wrote: Hi, zooming out of a raster map is always a very resource hungry task as a large area of points have to be read and reduced to the viewport size. For a steady map RasterIO does the perfect job. However if the user zooms out of a map very fast via mouse wheel RasterIO ea

[gdal-dev] Get a rough overview image via RasterIO

2008-11-12 Thread Oliver Eichler
Hi, zooming out of a raster map is always a very resource hungry task as a large area of points have to be read and reduced to the viewport size. For a steady map RasterIO does the perfect job. However if the user zooms out of a map very fast via mouse wheel RasterIO eats up too much time to a