<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns="http://www.w3.org/TR/REC-html40"><head><META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=us-ascii"><meta name=Generator content="Microsoft Word 12 (filtered medium)"><style></style></head><body bgcolor=white lang=EN-US link=blue vlink=purple><div class=WordSection1>Form XObjects (ISO 32000-1, 8.10) are an encapsulation method of PDF content.  It is a well defined transformation from PDF page (32000-1, 7.7.3.3) to Form XObject.  <o:p></o:p><o:p> </o:p>Leonard<o:p></o:p><o:p> </o:p><div><div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'>From: Andreas Butti [mailto:andreasbutti@gmail.com] Sent: Sunday, May 15, 2011 7:06 AM To: Leonard Rosenthol Cc: Albert Astals Cid; poppler@lists.freedesktop.org Subject: Re: [poppler] Direct Poppler access without frontend allowed?<o:p></o:p></div></div><o:p> </o:p>Am 15.05.2011 16:01, schrieb Leonard Rosenthol: <o:p></o:p>The method you are using is REALLY BROKEN!   <o:p></o:p> <o:p></o:p>Are you also copying all the resources over all well?   How do you handle resources used by Form XObjects or Patterns?<o:p></o:p> <o:p></o:p>The correct way to do this is to simply turn one of the pages into a Form XObject for the other page and then draw it.<o:p></o:p> I don't understand what you're meaning. Is there an simpler way to merge the PDFs together? Andreas <o:p></o:p> <o:p></o:p>Leonard<o:p></o:p> <o:p></o:p><div><div style='border:none;border-top:solid windowtext 1.0pt;padding:3.0pt 0in 0in 0in;border-color:-moz-use-text-color -moz-use-text-color'>From: <a href="mailto:poppler-bounces+leonardr=adobe.com@lists.freedesktop.org">poppler-bounces+leonardr=adobe.com@lists.freedesktop.org</a> [<a href="mailto:poppler-bounces+leonardr=adobe.com@lists.freedesktop.org">mailto:poppler-bounces+leonardr=adobe.com@lists.freedesktop.org</a>] On Behalf Of Andreas Butti Sent: Wednesday, May 11, 2011 11:36 PM To: Albert Astals Cid; <a href="mailto:poppler@lists.freedesktop.org">poppler@lists.freedesktop.org</a> Subject: Re: [poppler] Direct Poppler access without frontend allowed?<o:p></o:p></div></div> <o:p></o:p>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:<o:p></o:p><ul style='margin-top:0in' type=disc><li class=MsoNormal style='mso-list:l1 level1 lfo1'>Extract the contents stream of the pages<o:p></o:p></li><li class=MsoNormal style='mso-list:l1 level1 lfo1'>Append the stream from one page to the other page<o:p></o:p></li><ul style='margin-top:0in' type=circle><li class=MsoNormal style='mso-list:l1 level2 lfo1'>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<o:p></o:p></li></ul><li class=MsoNormal style='mso-list:l1 level1 lfo1'>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)<o:p></o:p></li><li class=MsoNormal style='mso-list:l1 level1 lfo1'>Write metadata (Creator, Autor, Creationdate etc.)<o:p></o:p></li><li class=MsoNormal style='mso-list:l1 level1 lfo1'>Writeout the document to a file<o:p></o:p></li><ul style='margin-top:0in' type=circle><li class=MsoNormal style='mso-list:l1 level2 lfo1'>Create new XREF table<o:p></o:p></li><li class=MsoNormal style='mso-list:l1 level2 lfo1'>compress the contents of the pages with GZ<o:p></o:p></li></ul></ul> 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:<o:p></o:p><ul style='margin-top:0in' type=disc><li class=MsoNormal style='mso-list:l0 level1 lfo2'>Edit text within PDF documents (not add, add is no problem with merging)<o:p></o:p></li><li class=MsoNormal style='mso-list:l0 level1 lfo2'>Delete objects from a PDF (e.g. select a rectangle and delete all objects within this rectangle)<o:p></o:p></li><li class=MsoNormal style='mso-list:l0 level1 lfo2'>Copy objects<o:p></o:p></li></ul>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: <o:p></o:p><pre>A Wednesday, May 11, 2011, Andreas Butti va escriure:<o:p></o:p></pre><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre>Hello everybody<o:p></o:p></pre></blockquote><pre> <o:p></o:p></pre><pre>Hi<o:p></o:p></pre><pre> <o:p></o:p></pre><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre> <o:p></o:p></pre><pre>I'm working on a new Xournal version (Xournal++, not yet present on a<o:p></o:p></pre><pre>webpage, only in the SVN).<o:p></o:p></pre><pre> <o:p></o:p></pre><pre>I used Poppler to display PDF and also for PDF export, to implement the<o:p></o:p></pre><pre>PDF export (merging two PDFs together) I access Poppler without any<o:p></o:p></pre><pre>frontend.<o:p></o:p></pre><pre> <o:p></o:p></pre><pre>I'm working on Ubuntu, which contain all necessary headers, but other<o:p></o:p></pre><pre>distributions don't.<o:p></o:p></pre><pre> <o:p></o:p></pre><pre>Now there is a discussion if it's allowed to access Poppler without<o:p></o:p></pre><pre>frontend, or not.<o:p></o:p></pre><pre> <o:p></o:p></pre><pre>I thought it should be allowed, because on the poppler Wiki are also two<o:p></o:p></pre><pre>projects listed which access poppler without frontent,<o:p></o:p></pre><pre> <o:p></o:p></pre><pre>But now I need a clear answer if it's allowed or not, and if not if<o:p></o:p></pre><pre>there is another way for me to implement this without breaking any rules.<o:p></o:p></pre></blockquote><pre> <o:p></o:p></pre><pre>It is not encouraged since we reserve the right to change the API (and do so) <o:p></o:p></pre><pre>at any release (minor versions included) while our API in the frontends is <o:p></o:p></pre><pre>much more stable.<o:p></o:p></pre><pre> <o:p></o:p></pre><pre>If you tell us what you are missing from the public frontend API we might add <o:p></o:p></pre><pre>it, or you might even contribute the code you have that uses the internal API <o:p></o:p></pre><pre>so we add it to our frontend ;-)<o:p></o:p></pre><pre> <o:p></o:p></pre><pre>Albert<o:p></o:p></pre><pre> <o:p></o:p></pre><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><pre> <o:p></o:p></pre><pre>Thank you for the answer.<o:p></o:p></pre><pre> <o:p></o:p></pre><pre> <o:p></o:p></pre><pre>Andreas<o:p></o:p></pre><pre> <o:p></o:p></pre><pre>_______________________________________________<o:p></o:p></pre><pre>poppler mailing list<o:p></o:p></pre><pre><a href="mailto:poppler@lists.freedesktop.org">poppler@lists.freedesktop.org</a><o:p></o:p></pre><pre><a href="http://lists.freedesktop.org/mailman/listinfo/poppler">http://lists.freedesktop.org/mailman/listinfo/poppler</a><o:p></o:p></pre></blockquote><pre>_______________________________________________<o:p></o:p></pre><pre>poppler mailing list<o:p></o:p></pre><pre><a href="mailto:poppler@lists.freedesktop.org">poppler@lists.freedesktop.org</a><o:p></o:p></pre><pre><a href="http://lists.freedesktop.org/mailman/listinfo/poppler">http://lists.freedesktop.org/mailman/listinfo/poppler</a><o:p></o:p></pre><o:p> </o:p></div></body></html>