Thanks for the info. It is important to know that at some point investing in some additional tailored component will help, but we are on the right trail :)
I would like to go on in this thread to solve some problems related to JAI operations. I am porting some morphological operations to jai operation level to work in geotools. I implemented an AreaOpImage, which worked well and now I am implementing a PointOpImage. The problem first was that working on a source Planarimage of about 2000x2000 pixels the the computeRect method was called several times with teh writableraster as smaller 512 pixels size. To get started I tried to define cobbleSources as true, in order to work just once on a single image. I set the region on an area of about 200x200 and what happened was that again the computeRect was called several times, every time with the same rectangle size of 200x200. am I missing simething? Why is the method called more than once. Thanks Andrea On Thu, Nov 27, 2008 at 6:35 PM, Martin Desruisseaux <[EMAIL PROTECTED]> wrote: > andrea antonello a écrit : >> Why would it make sense to use tiles when using a writable raster? >> I mean, it was created in memory and therefore taking just tiles is >> the same as taking it all? > > Probably in most cases. But it would also be possible (not sure if useful, but > at least possible) that the JAI deferred execution model (where raster are > computed only when first needed) actually creates WritableRaster. So it would > allow user to modify a WritableTile after it has been computed. We would need > a > way to save those modifications (so they are not lost when a new computation > is > trigged), but a custom of TileCache may do the trick. > >> Or is there a way to already predefine a disk space on which the >> writableraster in case would be dumped to? > > The default JAI implementation doesn't provide this functionality as far as I > know, but I think we can do that by providing our own TileCache > implementation. > > Martin > ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Geotools-gt2-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/geotools-gt2-users
