[pdftex] \pdfobj extended [was: Forward looking object references]

[The Thanh Han]

I was thinking of it -- unfortunately it doesn't seem possible, as in
order to use \pdfrefxform, the contents of the form must be known so
pdftex can calculate how much space the form takes.

It might be done using some tricks with primitives related pdfobj and
pdfxform -- I am not sure but one can give a try. It ot course requires
that you know pretty well how pdf works. Heiko, Hans or Martin can
certainly say more about this.

Theoretically it would be possible to make \pdfxform and \pdfximage work
this way (given that when using with useobjnum, the form/image
dimensions must be given). But what it would be good for? If there is a
really good reason for doing it I will give another try ;)

Thanh

On Wed, Mar 26, 2003 at 10:19:02PM -0500, Igor Khomyakov wrote:
> Thanh,
> 
> Are you planning to implement the same functionality
> (reserveobjnum/useobjnum) for \pdfxform and \pdfximage? For example:
> 
> ------------------------------------------------
> \pdfxform reservexformnum
> \count1=\pdflasxform
> Page 1 of \hbox{\pdfrefxform\count1}
> \hrule
> First page content ...
> \vfill\eject
> Page 2 of \hbox{\pdfrefxform\count1}
> \hrule
> Second page content ...
> \setbox0=\hbox{\folio}
> \pdfxform usexformnum \count1 0
> \pdfrefxform\pdflastxform
> \bye
> --------------------------------------------------------
> 
> Thanks!
> Igor.
> 
> PS: I compiled and ran the new version on Solaris 2.6 -- works nicely!
> 
> 
> ----- Original Message -----
> From: "The Thanh Han" <hanthethanh at hotpop.com>
> To: <pdftex at tug.org>
> Sent: Wednesday, March 26, 2003 3:36 AM
> Subject: [pdftex] \pdfobj extended [was: Forward looking object references]
> 
> 
> > Hi,
> >
> >
> > I extended the syntax of \pdfobj to:
> >
> > \pdfobj <object type spec>                              (h, v, m)
> > <object type spec> --> reserveobjnum
> >                     | [useobjnum <number>] [stream [<attr spec>]] <object
> contents>
> > <object contents> --> <file spec>
> >                     | <general text>
> >
> > When the optinal keyword `reserveobjnum' and `useobjnum' is not given,
> > the behaviour is unchanged.
> >
> > Usage example:
> >
> > \pdfobj reserveobjnum
> > \count0=\pdflastobj
> >
> > ....
> >
> > \pdfobj useobjnum \count0 {test}
> > \pdfrefobj\pdflastobj
> >
> > (or one can use \immediate\pdfobj useobjnum ...  instead of \pdfrefobj)
> >
> > If you use multiple \pdfobj useobjnum with the same object number, the
> > result is undefined ;)
> >
> > The whole sources tarball is available at
> > http://vinux.sourceforge.net/pdftex
> >
> > Further patches will be uploaded to tis location as well.
> >
> > Or one can use the texlive p4 server instead.
> >
> > Thanh
> > _______________________________________________
> > pdftex mailing list
> > pdftex at tug.org
> > http://tug.org/mailman/listinfo/pdftex