On Sun, Sep 22, 2013 at 10:21 PM, Tomaka, Jacek jacek.tom...@intergraph.com
wrote:
Hi,
Recently I tried to compile GDAL 1.10 with libjpeg + IPP 8.0.
I compiled IPP powered jpeglib 6b (taken from old IPP 7.0 samples, as IPP
8.0 examples contain version 8b).
I run into several issues, after some investigation it turned out that
different issues appear depending on the configuration of libjpeg library.
1. When libjpeg.IPP is compiled with IPP_SUSPENS defined then JPEG
decoding does not work. i.e. gdal_translate from jpeg to tiff produces
strange image.
JPEG encoded TIFFs were all right in this configuration.
2. When libjpeg.IPP is compiled with IPP_SUSPENS not defined then JPEG
encoded TIFFs decoding produces warning Warning 1: JPEGLib:Premature end
of JPEG file.
JPEG decoding is fine in this configuration. Strangely enough, the
decoded images (JPEG encoded TIFFS) seem to be correct in this case,
despite the warning.
Note, I confirmed that IPPJ_HUFF is defined during jpeg, and gtiff
formats compilation. If I don't define it I got the same warning but in
greater abundance.
Is there something obvious for You that I am missing? I read
http://trac.osgeo.org/gdal/wiki/JpegIPP but it turns a blind eye on
libjpeg configuration.
Jacek,
I don't recall any details about IPP_SUSPENS or IPPJ_HUFF. I'm not sure
what is causing your problem and I haven't tried building with IPP for
several years now.
I also tried to compile GDAL with jpeglib 8b but with no luck. Is this
version supported?
My understanding is that modern GDAL's should work with libjpeg 8. If
this isn't working, filing a ticket could be helpful.
Is GDAL taking advantage of suspended I/O?
Not that I'm aware of.
Another issue is that when IPP is doing IDCT when decoding jpegs,
autotests fail as it gives different checksums.
Should I open a ticket for it?
No need to file a ticket about this. I would expect the jpeg checksum
based tests to fail.
Has anyone had success making jpegs and tiffs compiled against jpeglib +
IPP work?
As I mention, it has been several years since I last did this, though it
did work then with the notes in the JpegIPP trac topic.
Best regards,
--
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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 Software Developer
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