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April 2010
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2010.04.02 13:45 "Re: TIFFReadScanline and large compressed one-strip files", by Frank Warmerdam
Folks, Thanks for the feedback. I'd like to whack the file producer upside the head, but other than a bit of moral satisfaction it does not solve the problem at hand. It is also not really ideal for my client to process the files externally. They have a popular desktop application that they would like to have support these files in a reasonably well performing way. As Joris suggests, it would have been nice if libtiff had been implemented with a streaming data flow into the decoders but it was not done that way and I'm not inclined to restructure things to do that properly. However, I am inclined to sort of fake a sort of streaming for those using the TIFFReadScanline() interface by keeping only a window of the raw data in the tif_rawdata buffer for this case. It looks like I should be able to this without actually changing the decoders as long as I am careful. This is likely to be a substantial patch, and not one I am inclined to incorporate in CVS before 4.0 final is released. So it will likely live in bugzilla as a patch for a while. I'll send notice if I'm successful with it. Best regards, -- ---------------------------------------+-------------------------------------- I set the clouds in motion - turn up | Frank Warmerdam, warmerdam@pobox.com light and sound - activate the windows | http://pobox.com/~warmerdam and watch the world go round - Rush | Geospatial Programmer for Rent