Adding JPEG output image file support to VTK

[Will Schroeder]

Hi John-

I've been away for a couple of days, sorry for the late response.

Why don't you send me the diffs. I'll look into getting them into the system. And thanks for the contribution.

The work you've done raises some issues that we've been wrestling with. 
Namely, how do we include software that has dependencies on external packages? Certainly your addition is extremely valuable and many people would like to use it. On the other hand, since the contribution requires additional external software, it ends up making VTK harder to compile and test.  Do you (or anyone on this list) have any ideas on how to manage this situation?

Will

At 04:08 PM 5/4/00 -0600, you wrote:
>I've added JPEG output file support to VTK and would like to contribute
>it back to the code base.  But therein hangs a tale, and any advice
>would be appreciated.
>
>First, I'm told that others have also added JPEG output image file
>support to VTK.  However, I don't see it in the source base, and my
>search of the E-mail archives yielded no hits on JPEG.  Please speak up
>if I'm wasting my time here.  Also please speak up if there's a good
>reason why such support hasn't made it into the code base
>heretofore--maybe there's a technical or political issue I'm ignorant of
>in this regard.
>
>Second, somehow the configuration script needs to sense both the
>presence of libjpeg.{a,so,lib} and the include file jpeglib.h.  And it
>needs to run under NT as well (the JPEG library itself compiles and runs
>just fine under NT).   I'm not a configuration script maven--can someone
>please advise the best way to do this?
>
>Third, the source base needs to be updated.  VTK gurus have CVS access,
>but I'm not sure I want to get this deep.  Is there someone I can just
>send the diffs to?
>
>Fourth are the details of my implementation.  I just added methods to
>vtkRenderWindow.{h,cxx} that parallel the PPM file output methods that
>already exist.  The only unusual thing about my JPEG output file
>implementation is that I have added code to turn of chroma downsampling
>so that the JPEG image is as high quality as can be obtained by an
>inherently lossy compression scheme.  Of course, the location of the
>origin needed to be remapped between the framebuffer and the JPEG image.
>
>In short, works great, would like to contribute it back to the source
>base if others find it useful, but don't wanna get tied up in my
>underwear.  How to proceed, O ye gods of VTK?
>
>Enjoy!
>
>John M. Linebarger
>Sandia National Laboratories
>
>
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