Ok, I can provide my code, but I need some help to complete integrate
with Poppler.
What I did now:
I have two PDFs, one for background and one for the foreground, like two
slides on a overhead projector, the second slide is on top of the first
slide. Sometimes there are two pages, 1 foreground and one background,
sometimes there is only one PDF.
Not all source PDFs are used always, and sometimes PDF Pages are used twice.
My code does the following:
* Extract the contents stream of the pages
* Append the stream from one page to the other page
o update all references, e.g. images and fonts, because /F1 in
one document is may not the same font than /F1 in the other
document
* Write outlines to the document (they have to be created by the
application, because if there are pages inserted / deleted, I
cannot use the original outlines)
* Write metadata (Creator, Autor, Creationdate etc.)
* Writeout the document to a file
o Create new XREF table
o compress the contents of the pages with GZ
My application is mostly written in C++, but I use GTK (no discussion
about this combination;-)).
So I first used the GLib frontend, but there I had problems with
searching, and I cannot access the underlying poppler objects.
The Question is now which frontend I should use.
In my opinion, the best solution is may to create a new frontend, e.g. a
PDF-editing frontend?
Because then it's possible to change some behaviour, and add other
things, like:
* Edit text within PDF documents (not add, add is no problem with
merging)
* Delete objects from a PDF (e.g. select a rectangle and delete all
objects within this rectangle)
* Copy objects
Currently there is no easy to use application which support these 3
operations for Linux.
If poppler would have such a frontend I'll may append this functionality
to Xournal++ (in the future, not now).
What do you think about this?
Andreas
Am 11.05.2011 21:43, schrieb Albert Astals Cid:
A Wednesday, May 11, 2011, Andreas Butti va escriure:
Hello everybody
Hi
I'm working on a new Xournal version (Xournal++, not yet present on a
webpage, only in the SVN).
I used Poppler to display PDF and also for PDF export, to implement the
PDF export (merging two PDFs together) I access Poppler without any
frontend.
I'm working on Ubuntu, which contain all necessary headers, but other
distributions don't.
Now there is a discussion if it's allowed to access Poppler without
frontend, or not.
I thought it should be allowed, because on the poppler Wiki are also two
projects listed which access poppler without frontent,
But now I need a clear answer if it's allowed or not, and if not if
there is another way for me to implement this without breaking any rules.
It is not encouraged since we reserve the right to change the API (and do so)
at any release (minor versions included) while our API in the frontends is
much more stable.
If you tell us what you are missing from the public frontend API we might add
it, or you might even contribute the code you have that uses the internal API
so we add it to our frontend ;-)
Albert
Thank you for the answer.
Andreas
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