[Mapserver-users] JPEG input

[Jan Hartmann]

It could be (those duplicate libraries *are* a pain), butI don't think 
so: I checked everything I could think of. I have a hunch that it is a 
duplicate symbol between GDAL and jpeg. I tried to compile GDAL with the 
original jpeg-6b distribution; the sourcefiles themselves are identical, 
  but jpeg-6b has a few additional files. I got a "duplicate symbol" 
error from the linker, so the problem could be caused by a global 
variable defined by GDAL and used by jpeg. Not a nice problem.

Jan


Ed McNierney wrote:
> Jan -
> 
> I believe these are all references to the same problem.  If you recompiled MapServer and got the same result, then you are still building with two different JPEG libraries in there somewhere.
> 
> Check your MapServer makefile for references to the jpeg-6b library, and check all the makefiles for supporting libraries, as well.  Be sure you are linking against GDAL.LIB rather than a custom JPEG library created in the frmts\jpeg directory.
> 
> I have attached my GD-2.0.11 Windows VC++ makefile for your reference.
> 
> 	- Ed
> 
> 
> -----Original Message-----
> From: Jan Hartmann [mailto:jhart at frw.uva.nl]
> Sent: Wednesday, April 02, 2003 10:06 AM
> To: Ed McNierney
> Cc: mapserver-users at lists.gis.umn.edu
> Subject: Re: [Mapserver-users] JPEG input
> 
> 
> No, that didn't work either. I created a library in 
> gdal-1.1.8\frmts\jpeg (lib out:libjpeg.lib *.obj) and linked GD 2.0.11 
> against this library, instead of the original libjpeg.lib. Then I 
> recompiled MapServer, and got the same result.
> 
> Norman Vine pointed me to a recent posting by Daniel Morissette on this 
> problem,
> 
> http://lists.gis.umn.edu/pipermail/mapserver-users/2003-January/000657.html
> 
> and a bugzilla item in
> 
> http://mapserver.gis.umn.edu/bugs/show_bug.cgi?id=203
> 
> The problem is more difficult than stated there: recompiling MapServer 
> without -DUSE_JPEG didn't help. Neither did compiling GD with the JPEG 
> routines from GDAL. Finally, it is NOT a Windows problem: Apache on 
> Linux came with the same error, although with a different size (464 
> instead of 520)
> 
>  >> JPEG parameter struct mismatch: library thinks size is 464, caller
>  >> expects 464
> 
> As a last resort I completely removed GDAL from the build and tried to 
> display the jpeg image. This time I got the error message:
> 
>  >> msDrawRasterLayer(): General error message. Attempt to render raster
>  >> layer to IMAGEMODE RGB or RGBA but without GDAL available. 24bit
>  >> output requires GDAL
> 
> I'm out of my depth.
> 
> Jan
> 
> 
> Ed McNierney wrote:
> 
>>Jan -
>>
>>No, you need to eliminate the two different JPEG libraries from the build.  In your case, that means modifying the GD build to link with the GDAL JPEG library.
>>
>>	- Ed
>>
>>-----Original Message-----
>>From: Jan Hartmann [mailto:jhart at frw.uva.nl]
>>Sent: Wednesday, April 02, 2003 8:28 AM
>>To: Ed McNierney
>>Cc: mapserver-users at lists.gis.umn.edu
>>Subject: Re: [Mapserver-users] JPEG input
>>
>>
>>I did that too! I commented out the three lines for JPEG support in 
>>MapServer's Makefile.vc, but the result was the same.
>>
>>Jan
>>
>>Ed McNierney wrote:
>>
>>
>>>Jan -
>>>
>>>Please forgive my incomplete recollection, but I ran into this same problem a long time ago.  It appears that the JPEG library inside GDAL is built slightly differently than the default jpeg-6b library (although it's the same version), and the two are not compatible.  I suspected it was a structure packing/alignment issue (i.e. the files are the same but they're compiled differently).  I decided not to look into it and simply use the JPEG support from GDAL and remove the jpeg-6b library from my build.  That fixed the problem.
>>>
>>>	- Ed
>>>
>>>Ed McNierney
>>>President and Chief Mapmaker
>>>TopoZone.com / Maps a la carte, Inc.
>>>73 Princeton Street, Suite 305
>>>North Chelmsford, MA  01863
>>>ed at topozone.com
>>>(978) 251-4242 
>>>
>>>-----Original Message-----
>>>From: Jan Hartmann [mailto:jhart at frw.uva.nl]
>>>Sent: Wednesday, April 02, 2003 6:19 AM
>>>To: mapserver-users at lists.gis.umn.edu
>>>Subject: [Mapserver-users] JPEG input
>>>
>>>
>>>Hello,
>>>
>>>I'm trying to display a jpeg input image and get the following error 
>>>message:
>>>
>>>JPEG parameter struct mismatch: library thinks size is 432, caller 
>>>expects 464
>>>
>>>Platform: Win2000, VC++
>>>Mapserver: CVS, compiled with and without JPEG input support (jpeg-6b)
>>>GD: 2.0.11, compiled with jpeg-6b
>>>GDAL: 1.1.8
>>>
>>>I diffed the jpeg files under GDAL with the jpeg-6b distribution and 
>>>found no differences. Yet there seems to be a version mismatch 
>>>somewhere. Outputting JPEG is no problem. Has anyone any ideas?
>>>
>>>Jan
>>>
>>>_______________________________________________
>>>Mapserver-users mailing list
>>>Mapserver-users at lists.gis.umn.edu
>>>http://lists.gis.umn.edu/mailman/listinfo/mapserver-users
>>>
>>
>>
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> 
>