[pdftex] Adding objects to the page

[Heiko Oberdiek]

Hello,

On Tue, Jan 26, 2010 at 03:56:42PM +0100, Patrick Gundlach wrote:

> > Package `atbegshi'. With \AtBeginShipoutUpperLeft and
> > \AtBeginShipoutUpperLeftForeground you can put things in the
> > background or foreground of the output box inside \AtBeginShipout.
> 
> Gee! I need to get TeXbrain 2.0 before I understand what is going on there. If
> I come across a similar problem, I will try out 'atbegshi'.
> 
> If someone (the archive) wants to know what I am doing now... (some off topic LuaTeX code following)
> 
> I have taken this from plain.tex:
> 
> \def\plainoutput{\shipout\vbox{\dothingsbeforeoutput\pagebody\makefootline}%
>  \advancepageno
>  \ifnum\outputpenalty>-20000 \else\dosupereject\fi}
> 
> (Just added \dothingsbeforeoutput) 
> 
> this is \dothingsbeforeoutput:
> 
> \def\dothingsbeforeoutput{
> \directlua{dothingsbeforeoutput()}
> }
> 
> and there I collect \pdfliteral page {......} TeX-strings and write back
> to TeX via 'tex.sprint("\\pdfliteral page {.....}")'. This way I make
> sure these pdfilterals come before the page contents. That was a very
> easy hack. I hope it has no side effects.

\input atbegshi.sty
\AtBeginShipout{%
  \setbox\AtBeginShipoutBox=\hbox{%
    \pdfliteral ...
    \copy\AtBeginShipoutBox
  }%
}

Yours sincerely
  Heiko <oberdiek at uni-freiburg.de>
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