[Bug 381668] [NEW] xfig produces illegal PNG file when exporting as PNG

[dominiko]

Public bug reported:

Binary package hint: xfig

Summary: Exporting a figure as PNG with xfig produces illegal PNG file.

Steps to reproduce:

1/ start 'xfig foo.fig' from command line:
    $ xfig foo.fig

2/ draw something (it does not matter what you draw)

3/ Export as PNG with:  File -> Export 
    In the export dialog box, select "Language: PNG (Portable Network Graphic)"
    and click "Export" button

4/ observe that xfig has produce file "foo.png" (so far so good)

5/ Now run "optipng" tool from command line with:
    $ optipng foo.png

6/ Observe the following error:

$ optipng foo.png 
OptiPNG 0.6.2.1: Advanced PNG optimizer.
Copyright (C) 2001-2009 Cosmin Truta.

** Processing: foo.png
Warning: Extraneous data found after IEND
39x39 pixels, 3x8 bits/pixel, RGB
Reducing image to 1 bit/pixel, 2 colors in palette
Recoverable errors found in input. Rerun OptiPNG with the -fix option.
Error: Previous error(s) not fixed

** Status report
1 file(s) have been processed.
1 error(s) have been encountered.


-> the PNG file is illegal.  It can be corrected though with "optipng -fix foo.png".

I'm using xfig as shipped with Ubuntu 9.04 (Jaunty)
$ xfig -v
Xfig 3.2 patchlevel 5 (Protocol 3.2)

** Affects: xfig (Ubuntu)
     Importance: Undecided
         Status: New

-- 
xfig produces illegal PNG file when exporting as PNG
https://bugs.launchpad.net/bugs/381668
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