Finally I succeed with this code: http://drifted.in/other/MultiPagePDFTranscoder.java
It is based on a default PDFTranscoder with a simple loop. I suppose there is a room for additional improvements... With this code I am getting ca 15% time reduction for two page outputs. Not much, but I am satisfied :-) Jan > -----Original Message----- > From: honyk [mailto:j.tosov...@email.cz] > Sent: Wednesday, April 17, 2013 8:24 PM > To: fop-dev@xmlgraphics.apache.org > Subject: RE: [OT] Multi-page support in PDFTranscoder > > > So if I understand well, you are using FOP but not using FO. > > Exactly. > > > So, why not just use FO to do that? > > This was my original approach, but I ran into troubles with memory > leaks. It > is described here: > http://mail-archives.apache.org/mod_mbox/xmlgraphics-fop- > users/201202.mbox/% > 3C00c101ccf39a$08fbe1e0$1af3a5a0$@tosov...@email.cz%3E > > Additionally, in case of FO I had to > - store image streams into temporary files > - generate temporary FO with all images linked > > > Currently I prefer as efficient conversion as possible. > > I've already deciphered by what class that super.transcode(document, > uri, > output) is called - it is Batik's org.apache.batik.transcoder. > SVGAbstractTranscoder. > > In meantime I've also found this promising thread: > http://apache-fop.1065347.n5.nabble.com/Generating-a-PDF-by-drawing-to- > PDFDo > cumentGraphics2D-td17954.html > > Now I investigate it further. > > Jan > > > > -----Original Message----- > > From: Luis Bernardo [mailto:lmpmberna...@gmail.com] > > Sent: Tuesday, April 16, 2013 12:44 AM > > To: fop-dev@xmlgraphics.apache.org > > Subject: Re: [OT] Multi-page support in PDFTranscoder > > > > > > So if I understand well, you are using FOP but not using FO. And you > > want to merge multiple PDF pages which are generated from SVG > sources. > > So, why not just use FO to do that? If you look at > > examples/fo/svg/external.fo you will quickly see how to do that. > > > > On 4/11/13 8:48 PM, honyk wrote: > > > Dear All, > > > > > > in my app I generate multipage PDFs from SVG sources. Currently I > use > > Fop's > > > PDF Transcoder and all individual PDF pages (byte streams) merge > > together > > > using PDFBox. > > > > > > I am considering extending the org.apache.fop.svg.PDFTranscoder > class > > to > > > enable passing document array into the transcode method and to > avoid > > another > > > dependency or, better, inefficiency. > > > > > > protected void transcode(Document[] documents, String uri, > > TranscoderOutput > > > output) { > > > // my code > > > } > > > > > > But analyzing the code I am not sure if something like this is even > > > possible. E.g. this line is completely unclear to me (there is no > > transcode > > > method in the AbstractFOPTranscoder): > > > > > > super.transcode(document, uri, output); > > > > > > To be honest, I don't understand well how the final PDF file is > > generated > > > from input SVG nor the way how to intervene into this process and > > insert a > > > page break followed by another page. > > > > > > Can be transcoder modified this way or it would be too complicated? > > > > > > Thanks for any hints, > > > > > > Jan >
