[Bug 228547] graphics/hugin doesn't handle PNG images

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=228547

            Bug ID: 228547
           Summary: graphics/hugin doesn't handle PNG images
           Product: Ports & Packages
           Version: Latest
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: grog at FreeBSD.org
          Reporter: a.parseg at gmail.com
          Assignee: grog at FreeBSD.org
             Flags: maintainer-feedback?(grog at FreeBSD.org)

Running Hugin version 2018.0.0.5abfb4de7961 from packages on 
FreeBSD 11.1-RELEASE-p9 (I have noticed the problem since whatever versions
were current as of december 2017).

In Hugin's Assistant tab, trying to load PNGs fails with the dialog :
"Unsupported image file format | Could not decode image: <first of the selected
files>.png. Abort".

Launching from the command line, the following appears:
 ---8<---
ERROR: caught exception: 
Precondition violation!
did not find a matching file type.
(/wrkdirs/usr/ports/graphics/vigra/work/vigra-e6c21f3/src/impex/codecmanager.cxx:234)
 --->8---

Loading the same files converted (with imagemagick's 'convert') to TIFF or
JPEG, with exif tags copied using exiftool, works normally and the images are
successfully aligned and processed.

Once the images are aligned, from the Assistant tab's "Create Panorama"  button
the 'Output parameters' dialog is shown, offering under 'Size and file format'
the option to output to PNG, JPEG or TIFF.

If the PNG format is selected, the panorama creation process starts normally,
but fails when blending the images; the 'Status report' window ends on 
 ---8<---
enblend: error opening output file "<panorama picture file>.png";
enblend: 
Precondition violation!
did not find a matching codec for the given file extension
(/wrkdirs/usr/ports/graphics/vigra/work/vigra-e6c21f3/src/impex/codecmanager.cxx:271)

enblend: info: remove invalid output image "<panorama picture file>.png"
enblend: warning: could not remove invalid output image "<panorama picture
file>.png": No such file or directory
 --->8---
If either PNG or JPEG is selected instead, the blending, stitching and writing
of the panorama image completes normally.

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