[Gdal-dev] update TIFF compressed files in place

[Julien Demaria]

Andrey,

I work with CVS GDAL and play with the new feature "update TIFF compressed 
files in place" with gdalwarp ; my little tests work well except with a RGB 
file with JPEG compression :

Warning 1: JPEGLib:Application transferred too many scanlines
ERROR 1: JPEGLib:Improper call to JPEG library in state 101
Warning 1: JPEGLib:Application transferred too many scanlines
ERROR 1: JPEGLib:Improper call to JPEG library in state 101
Warning 1: JPEGLib:Application transferred too many scanlines

and the resulting file is wrong.

If I want to create a pixel interleaved file (-co INTERLEAVE=PIXEL) I have 
another error :

Warning 1: JPEGLib:Application transferred too many scanlines
gdalwarp: tif_jpeg.c:651: JPEGPreDecode: Assertion 
`sp->cinfo.comm.is_decompressor' failed.

and the resulting file is all black...


Thanks in advance,

Julien

At 23:58 24/09/2004, Andrey Kiselev wrote:
>On Thu, Sep 23, 2004 at 01:41:31PM -0400, Larry Grill wrote:
> > I'm seeing a large performance hit with 3.7b vs. 3.6.1 compiled under
> > MS VC7 or VC6. Our the code section loops through rows doing,
> > TIFFReadEncodedStrip and TIFFWriteScanline. The perfomance difference
> > is approximately 30% and I can compare with a simple recompile of our
> > application linking one version of the library vs. the other.
>
>Larry,
>
>I think I know why the new libtiff is slower than the older one. I have
>implemented a new feature (update compressed files in place), but this
>results in perfomance degradation. I know how to improve things, so the
>fix will come shortly.
>
>                                                         Andrey
>--
>Andrey V. Kiselev
>Home phone:  +7 812 5274898  ICQ# 26871517
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