On Thu, Jun 17, 2010 at 11:03 AM, Zermeno, Robert J CIV NAVAIR, 472100D <robert.zerm...@navy.mil> wrote: > > GDALBeginAsyncReader(fileDataset, > 0, 0, //Start at top-left position > ImageWidth, ImageHeight, //Note, I am requesting whole image. > JPIP_Buffer, > BufferXSize, > BufferYSize, > GDT_Byte, > colorScheme, > Bandmap, > 0, > 0, > 0, > 0); > > > Under the hood, how does the function take the original image size and scale > it down to fit > Into the a size much smaller than original? For some reason, when I do this > for RGB color > Images, it gives a AccessViolation error when it calls > GDALARGetNextUpdatedRegion(). However, > For Grayscale images, it works fine. What would you think might be the > problem?
Robert, Your call parameters seem fine. I do not understand why you are having problems. If you are unable to get it to work, feel free to file a ticket with a small compilable code example demonstrating the problem, and setup to access a public server or data source. You asked "how does the function take the original image and scale it down to fit in a much smaller image". I'm not sure if you are looking for internal details or just whether you are requesting this properly from the outside. If you need details about the internals I can try to provide. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmer...@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org http://lists.osgeo.org/mailman/listinfo/gdal-dev
