# [pdftex] XObject name

Igor Khomyakov igorkh at optonline.net
Fri Apr 15 05:51:23 CEST 2005

Thanh,

Please accept my apologies for the misleading email --- you decided against
forward xform references because of the unknown xform dimensions. Please
find all relevant email (including my thoughts on how to workaround the
problem) below --- it would be great if you could give it another try.

Best regards,
Igor.

----- Original Message -----
From: "Igor Khomyakov" <igorkh at optonline.net>
To: <pdftex at tug.org>; "The Thanh Han" <hanthethanh at users.sourceforge.net>
Sent: Friday, March 28, 2003 5:24 AM
Subject: Re: [pdftex] \pdfobj extended [was: Forward looking object
references]

> One possible solution is to assume zero width, height, and depth for
> \pdfrefxform that points to a reserved xformnum. We can think of these
> references as of special kind of \pdfliterals that also have zero
dimensions
> but importantly pdftex knows their relative position, and therefore it
> is very convenient to include some useful pdf drawings, etc. If one
> needs to specify the sizes, he or she can "box" the \pdfrefxform as in
> the
following
> example:
>
>    \hbox to ... {\vbox to ... {\pdfrefxform\count1}
>
> The real typesetting of the xform (the media box, etc) occurs when we
issue
> \pdfxform command -- at this time we already have the sizes of the xform.
>
> The "xform forward references" should be very good for single-pass
> typesetting of little fit-into-single-page things that should appear
> in a document before their content (value) is known. For example: the
> total number of pages (the example below in my previous email), or
> the beginning of
a
> document. I think that this functionality will be the most appreciated
> by reporting applications that can save a lot by avoiding the second pass.
>
> The other two reasons to implement this functionality are: 1) PDF
> format supports it, and 2) since we already can reserve and use the
> numbers for objects, it would be more consistent to have similar
> functionality for xforms and ximages ;)
>
>
> Best regards,
> Igor.
>
> ----- Original Message -----
> From: "The Thanh Han" <hanthethanh at users.sourceforge.net>
> To: <pdftex at tug.org>
> Sent: Thursday, March 27, 2003 9:48 PM
> Subject: Re: [pdftex] \pdfobj extended [was: Forward looking object
> references]
>
>
> > 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
> >
> > 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
> > _______________________________________________
> > pdftex mailing list
> > pdftex at tug.org
> > http://tug.org/mailman/listinfo/pdftex
>
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>

-----Original Message-----
From: The Thanh Han <hanthethanh at gmx.net>
Date: Thu, 14 Apr 2005 16:49:07
To:Igor Khomyakov <ikh at tmo.blackberry.net>
Subject: Re: [pdftex] XObject name

can you please resend the relevent mails? I forgot about that. Sorry.

Thanh