[poppler] About possibility to create a TOC for PDF documents

[Andy Sardina]

  Foxit Reader doesn't create the outline automatically, but it gives the
possibility to the user to create it. Please, take a look at the short
video I have attached.
That's the type of behavior I will like to have in Okular, but to be able
to do it, I think that Poppler needs to be able to store the outline in the
PDF file.

 Swedish Fairy Tales.mp4
<https://drive.google.com/file/d/1ADdebIeWX5zdaKe7IMKIM6r-94Sryv-0/view?usp=drive_web>

El lun., 23 sept. 2019 a las 18:49, Adrian Perez de Castro (<
aperez at igalia.com>) escribió:

> On Sun, 15 Sep 2019 20:15:35 +0300, Andy Sardina <andysardina22 at gmail.com>
> wrote:
> > Hi everyone,
> >
> >     I sometimes get PDF files that do not contain TOC. I really like that
> > in Foxit Reader you can create the TOC and I would like to have the same
> > functionality in Okular. I have been looking at the source code of
> Poppler
> > and I couldn't find a function to set an Outline object. Is anybody
> working
> > on it? I would like to contribute to it.
>
> For tagged PDFs you can probably get a very good TOC by fetching the
> document's structure tree and traversing it to extract the interesting
> parts.
> With the GLib API you can use PopplerStructureElement [1] to inspect the
> structure of the document and pick the heading elements.
>
> Beware that not all PDFs are tagged, so this won't work for every document
> out there. For non-tagged documents, I suppose Foxit uses some heuristics
> to guess which text elements are section headings.
>
> I hope this helps.
>
> Cheers,
> —Adrián
>
> ---
> [1] https://poppler.freedesktop.org/api/glib/PopplerStructureElement.html
>
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