[Libjpeg-devel-6x] progressive jpeg without optimization

[Péter K. <pet...@gm...>]

Hi guys,

I would like to create many same sized progressive jpeg files with the same
huffman tables. Because I'd like to store the huffman table part of the
files separately and when I have to show the progressive jpeg just
concatenate the huffman table and the image part together.

I read in the doc that:

We should also note that the compressor currently forces Huffman
optimization
mode when creating a progressive JPEG file, because the default Huffman
tables are unsuitable for progressive files.

I've found this in the code:
      if (cinfo->progressive_mode) /*  TEMPORARY HACK ??? */
        cinfo->optimize_coding = TRUE; /* assume default tables no good for
progressive mode */

But unfortunately if I remove this from the jpeg lib I won't get the same
huffman tables

Could you help me to create this kind of progressive jpeg?

Br,
Peter