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Bug#993331: JPEG2000/JP2 support missing

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Package: qt5-image-formats-plugins
Version: 5.15.2-2

It seems that the Debian `qt5-image-formats-plugins` package does not 
support JPEG2000/JP2 images, in spite of this format being supported by 
Qt [1] through the JasPer Image Processing/Coding Tool Kit [2]. This 
results in QImage-based end-user applications such as Gwenview not 
supporting this popular image format, although technically possible.

In order to add JP2 support, `qt5-image-formats-plugins` would need to 
be built with JasPer, which would first require packaging the latter in 
Debian. The Ubuntu repository already contains a package named `jasper`, 
but it does something completely different [3], so the image processing 
JasPer package may need to be named differently.

JasPer used to be affected by security issues [4], but as of the day of 
writing all known CVEs are fixed [5], and JasPer continues to be 
maintained by the original author Michael Adams and contributors [6] 
(latest version 2.0.33 released on 2021-08-01 [7]).

Note that the author of this bug report does not use Debian itself, but 
the Ubuntu-based KDE Neon [8]. However, judging by the list of 
dependencies [9], `qt5-image-formats-plugins` is not built with JasPer 
and thus without JP2 support in Debian. Therefore, this report should 
only be seen as a notification to the Debian packaging team in order to 
promote support for the JP2 format.

[1] 
https://github.com/qt/qtimageformats/blob/dev/src/plugins/imageformats/jp2/qjp2handler.cpp
[2] https://github.com/jasper-software/jasper
[3] https://packages.ubuntu.com/hirsute/jasper
[4] https://github.com/jasper-software/jasper/issues/208
[5] 
https://github.com/jasper-software/jasper/issues/208#issuecomment-665471904
[6] https://github.com/jasper-software/jasper/graphs/contributors
[7] https://github.com/jasper-software/jasper/releases/tag/version-2.0.33
[8] https://bugs.kde.org/show_bug.cgi?id=441673
[9] https://packages.debian.org/bullseye/qt5-image-formats-plugins

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Bug#993331: JPEG2000/JP2 support missing Manuel Geißer <geisserml@gmail.com> - 2021-08-30 23:10 +0200
  Bug#993331: JPEG2000/JP2 support missing Norbert Preining <norbert@preining.info> - 2021-08-31 02:50 +0200
  Bug#993331: JPEG2000/JP2 support missing Manuel Geißer <geisserml@gmail.com> - 2021-08-31 13:20 +0200

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