>> I would be glad if someone could answer my question.
>
> During bachotex 2018 Pawel Jakowski (son of Jacko -- tex gyre
> project) showed me some code and after looking at it we realized
> that it could be used as drop in for poppler. [...]
Thanks. Indeed, having direct contact to a developer helps a lot in
writing code.
> [...] The biggest advantage is that we got rid of a c++ dependency
> and that the code (which is unlikely to change much) is part of the
> luatex code base. So it's in fact a library specially made for
> luatex originating in the tex community.
OK.
Werner
