[gdal-dev] Question on GDAL using libjpegturbo.

[Daniele Romagnoli]

Hi List,
we are doing some performance tests with gdal operations (translate, warp,
...) and we are rewriting our output files as GeoTIFF with JPEG compression
and YCBCR Photometric interpretation.
We would like to involve libjpegturbo on that so I have a couple of
questions on the topic.
Before starting the new tests we have built a standard GDAL 2.1 version (on
Centos 7) and did some "benchmarks".

Now we would like redo the tests using libjpegturbo.
1) Should we re-build GDAL once libjpegturbo is installed on the machine?
In that case, is there any explicit setting to be provided to ./configure
or any output message from the ./configure confirming that libjpegturbo
will be used?
2) is there any CPL_DEBUG similar env var to be configured to better know
what is happening when running the gdal utilities in relation to the
libjpegturbo usage?

I have already taken a look to the GDAL JPEG format page but it doesn't say
too much.

*"It is also possible to use the JPEG driver with the libjpeg-turbo, a
version of libjpeg, API and ABI compatible with IJG libjpeg-6b, which uses
MMX, SSE, and SSE2 SIMD instructions to accelerate baseline JPEG
compression/decompression"*
Thanks in advance.
Cheers,
Daniele


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