Re: xv

From	Dan Hitt <dan.hitt@gmail.com>
Newsgroups	linux.debian.user
Subject	Re: xv
Date	2021-05-23 03:30 +0200
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On Sat, May 22, 2021 at 2:33 PM Thomas Schmitt <scdbackup@gmx.net> wrote:

> Hi,
>
> Charlie Gibbs wrote:
> > <filename>: Unsupported JPEG process: SOF type 0xc2
>
> My xv reports this on Progressive JPEG images like
>   http://www.reasoft.com/tutorials/web/img/progress.jpg
>
> My xv binary stems from source xv-3.10a.tar.gz of june 2000.
> Its Makefile indicates that it gets linked statically with a libjpeg.a
> which the source tarball brings in subdirectory ./jpeg.
>
> The file jpeg/jdmarker.c in this libjpeg copy emits the error for many SOF
> types. See line 771 ff. and JERR_SOF_UNSUPPORTED in jpeg/jerror.h.
>
> In contrast to that, the library
>   /usr/lib/x86_64-linux-gnu/libjpeg.a
> of package libjpeg62-turbo-dev supports SOF2:
>
> https://sources.debian.org/src/libjpeg-turbo/1:2.0.6-4/jdmarker.c/?hl=1000#L1000
>
> So an adventurous programmer could try to trick the old xv into linking
> Debian's libjpeg.a, or could try to replace the source in xv's ./jpeg by
> the
> source of Debian's libjpeg-turbo.
>
>
> ----------------------------------------------------------------------------
>
> My personal solution is different, as i find xv's display of oversized
> images
> abysmal, while the beautiful results of ImageMagic's "convert" can cost
> gigabytes of RAM if the input is large enough.
> So i created a program based on libjpeg which reads JPEGs line by line
> and emits the resized result line by line. The resizer works with a
> discrete rectangular pixel model rather than a continous space.
>
> As windfall profit this program can read progressive JPEGs with SOF2 and
> stores its results as sequential JPEGs which xv can read.
>
> (I can provide its source code under BSD license if no better converter
> can be found.)
>
>
> Have a nice day :)
>
> Thomas
>
>
Thomas, that sounds awesome, please do post somewhere (and provide a link
here, if you would be so kind).

I would like to try it out, and i'll bet others would too.

dan

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Re: xv Dan Hitt <dan.hitt@gmail.com> - 2021-05-23 03:30 +0200
  Re: xv Dan Hitt <dan.hitt@gmail.com> - 2021-05-23 19:30 +0200
    Re: xv "Thomas Schmitt" <scdbackup@gmx.net> - 2021-05-23 22:30 +0200
      Re: xv Dan Hitt <dan.hitt@gmail.com> - 2021-05-24 00:40 +0200
  Re: xv "Thomas Schmitt" <scdbackup@gmx.net> - 2021-05-23 13:40 +0200

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