[Libreoffice-bugs] [Bug 139778] New: Switch to ZXing-C++ library for generating QR codes

[bugzilla-daemon at bugs.documentfoundation.org]

https://bugs.documentfoundation.org/show_bug.cgi?id=139778

            Bug ID: 139778
           Summary: Switch to ZXing-C++ library for generating QR codes
           Product: LibreOffice
           Version: unspecified
          Hardware: All
                OS: All
            Status: UNCONFIRMED
          Keywords: difficultyInteresting, easyHack, skillCpp
          Severity: enhancement
          Priority: medium
         Component: LibreOffice
          Assignee: libreoffice-bugs at lists.freedesktop.org
          Reporter: ilmari.lauhakangas at libreoffice.org
            Blocks: 127232

This task consists of bundling another QR code library while switching the
library calls to use it instead of the old one.

Background: the QR code generating functionality was added in a 2019 GSoC
project:
https://wiki.documentfoundation.org/Development/GSoC/Successfully_Implemented_Ideas#Generating_QR_codes
At the time, "QR Code generator" seemed like the only usable C++ library.
Later, the creator of the library said it wasn't actually ready for production
use.

Recently, a new C++ port of the venerable "Zebra Crossing" library appeared:
https://github.com/nu-book/zxing-cpp
It is seeing rather good adoption in Linux distros:
https://repology.org/project/zxing-cpp-nu-book/versions

It has the advantage that it can also generate classic barcodes. Exposing the
barcode functionality in the UI can be a future easy hack.

The source archive has already been uploaded to
https://dev-www.libreoffice.org/src/

For code pointers, here is the commit that bundled the current library:
https://git.libreoffice.org/core/commit/b4141cade04dac0c9d47293313a4521282975f12

Other relevant code paths can be discovered by looking at Shubham's commit
history.

Samuel has agreed to do code reviews for this task.

Small note: ZXing-C++ says of the compiler baseline: "minimum VS 2019 16.8 /
gcc 7 / clang 5". However, Visual Studio 16.8 is only required when using the
Python wrapper, so it is not a blocker for us.


Referenced Bugs:

https://bugs.documentfoundation.org/show_bug.cgi?id=127232
[Bug 127232] [META] QR-code generator's problems and enhancements
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