% Copyright 2006 by Till Tantau
%
% This file may be distributed and/or modified
%
% 1. under the LaTeX Project Public License and/or
% 2. under the GNU Public License.
%
% See the file doc/generic/pgf/licenses/LICENSE for more details.

\ProvidesFileRCS $Header: /cvsroot/pgf/pgf/generic/pgf/systemlayer/pgfsys-common-pdf-via-dvi.def,v 1.4 2008/02/05 10:25:36 tantau Exp $

% Common driver commands for all drivers that produce pdf via the
% detour of a dvi file

\def\pgfsys@invoke#1{\special{pdf: content Q #1 q}}

\def\pgfsys@hbox#1{%
  \special{pdf: content Q q -1 0 0 -1 0 0 cm q}%
  \special{pdf: content -1 0 0 -1 0 0 cm 3 Tr q}% translate to
                                % original coordinate system and do
                                % not show anything
  {\hbox to 0pt{\pgfutil@font@normalfont\pgfutil@selectfont.\hss}}% enforce font change
  \special{pdf: content Q 0 Tr q}% end of font change enforcement.
    \wd#1=0pt%
    \ht#1=0pt%
    \dp#1=0pt%
    \box#1
  \special{pdf: content Q n Q}%
}
\def\pgfsys@beginpicture{%
  \special{pdf: content Q 3 Tr q}% do not show anything
  \hbox to 0pt{\pgfutil@font@normalfont\pgfutil@selectfont.\hss}% enforce font change
  \special{pdf: content Q 0 Tr q}% end of font change enforcement.
  \special{pdf: content q}}
\def\pgfsys@endpicture{%
  \special{pdf: content n Q}%
}
\def\pgfsys@beginpurepicture{\special{pdf: content q}}


\def\pgf@sys@pdf@addtopageresources@extgs#1{%
  \ifx\pgf@sys@pdf@obj\@undefined%
    \global\let\pgf@sys@pdf@obj=\relax%
    \special{pdf: obj @pgfopacities << >>}% <<
  \fi%
  \special{pdf: put @pgfopacities << #1 >>}% <<
  \special{pdf: put @resources << /ExtGState @pgfopacities >>}% <<
}
\def\pgf@sys@pdf@readdtopageresources@extgs#1{%
  \special{pdf: put @resources << /ExtGState @pgfopacities >>}% <<
}

\def\pgfsys@imagesuffixlist{.pdf:.jpg:.jpeg:.png:}
\def\pgfsys@horishading#1#2#3{%
  {%
    \pgf@parsefunc{#3}%
    \pgf@process{\pgfpoint{\pgf@max}{#2}}%
    \edef\@temp{\noexpand\pgf@sys@atbeginpage{\special{pdf: beginxobj @pgfshade#1 width \the\pgf@max\space height \the\pgf@y}}}\@temp%
    \edef\@temp{\noexpand\pgf@sys@atbeginpage{\special{pdf: put @resources <<
      /Shading << /Sh << /ShadingType 2
      /ColorSpace /DeviceRGB
      /Domain [\pgf@pdfparseddomain]
      /Coords [\pgf@doma\space0 \pgf@domb\space0]
      /Function \pgf@pdfparsedfunction
      /Extend [false false] >> >> >>}}}\@temp% <<
      \pgf@sys@atbeginpage{\special{pdf: content /Sh sh}%
      \special{pdf: endxobj}}%
    \expandafter\xdef\csname @pgfshading#1!\endcsname{%
      \hbox to\the\pgf@max{\vbox to#2{\vfil\special{pdf: usexobj @pgfshade#1}}\hfil}}% 
  }%
}
\def\pgfsys@vertshading#1#2#3{%
  {%
    \pgf@parsefunc{#3}%
    \pgf@process{\pgfpoint{\pgf@max}{#2}}%
    \edef\@temp{\noexpand\pgf@sys@atbeginpage{\special{pdf: beginxobj @pgfshade#1 width \the\pgf@y\space height \the\pgf@max\space}}}\@temp%
    \edef\@temp{\noexpand\pgf@sys@atbeginpage{\special{pdf: put @resources <<
      /Shading << /Sh << /ShadingType 2
      /ColorSpace /DeviceRGB
      /Domain [\pgf@pdfparseddomain]
      /Coords [0 \pgf@doma\space0 \pgf@domb]
      /Function \pgf@pdfparsedfunction
      /Extend [false false] >> >> >>}}}\@temp% <<
      \pgf@sys@atbeginpage{\special{pdf: content /Sh sh}%
      \special{pdf: endxobj}}%
    \expandafter\xdef\csname @pgfshading#1!\endcsname{%
      \hbox to#2{\vbox to\the\pgf@max{\vfil\special{pdf: usexobj @pgfshade#1}}\hfil}}% 
  }%
}
\def\pgfsys@radialshading#1#2#3{%
  {%
    \pgf@parsefunc{#3}%
    \pgf@process{#2}%
    \pgf@xa=\pgf@x%
    \pgf@ya=\pgf@y%
    \pgf@process{\pgfpoint{\pgf@max}{\pgf@max}}%
    \advance\pgf@xa by \pgf@x\relax%
    \advance\pgf@ya by \pgf@y\relax%
    \pgf@sys@bp@correct{\pgf@x}%
    \pgf@sys@bp@correct{\pgf@y}%
    \pgf@sys@bp@correct{\pgf@xa}%
    \pgf@sys@bp@correct{\pgf@ya}%
    \pgfutil@tempdima=2\pgf@max\relax%
    \edef\@temp{\noexpand\pgf@sys@atbeginpage{\special{pdf: beginxobj @pgfshade#1 width \the\pgfutil@tempdima\space height \the\pgfutil@tempdima}}}\@temp%
    \edef\@temp{\noexpand\pgf@sys@atbeginpage{\special{pdf: put @resources <<
      /Shading << /Sh << /ShadingType 3
      /ColorSpace /DeviceRGB
      /Domain [\pgf@pdfparseddomain]
      /Coords [\pgf@sys@tonumber{\pgf@xa} \pgf@sys@tonumber{\pgf@ya} \pgf@doma\space \pgf@sys@tonumber{\pgf@x} \pgf@sys@tonumber{\pgf@y} \pgf@domb]
      /Function \pgf@pdfparsedfunction
      /Extend [true false] >> >> >>}}}\@temp% <<
      \pgf@sys@atbeginpage{\special{pdf: content /Sh sh}%
      \special{pdf: endxobj}}%
    \expandafter\xdef\csname @pgfshading#1!\endcsname{%
      \hbox to\the\pgfutil@tempdima{\vbox to\the\pgfutil@tempdima{\vfil\special{pdf: usexobj @pgfshade#1}}\hfil}}% 
  }%
}%

% The following is an ugly hack. We need something like
% "everyshipout".
% But it should be ultra-portable...
\def\pgf@sys@atbeginpage#1{\AtBeginDvi{#1}}
\AtBeginDocument{% hack for old hyperref
  \ifx\Hy@begindvi\@undefined%
    \let\pgf@sys@continue@hyper=\pgfutil@empty%
  \else%
    \pgf@sys@test@hyper%
  \fi%
  \def\@begindvi{\unvbox\@begindvibox\pgf@sys@continue@hyper}
}

\def\pgf@sys@test@hyper{%
  \ifHy@implicit%
    \let\pgf@sys@continue@hyper=\Hy@begindvi%
  \else%
    \let\pgf@sys@continue@hyper=\HyPL@EveryPage%
  \fi%
}

\def\pgf@sys@pdf@dvi@tracker{
  \def\pgfsys@markposition##1{%
    \pdfsavepos%
    \edef\pgf@temp{##1}%
    \expandafter\write\expandafter\pgfutil@auxout\expandafter{%
      \expandafter\noexpand\expandafter\pgfsyspdfmark\expandafter{\pgf@temp}{\the\pdflastxpos}{\the\pdflastypos}}%
  }
  \def\pgfsyspdfmark##1##2##3{%
    \expandafter\gdef\csname pgf@sys@pdf@mark@pos@##1\endcsname{\pgfqpoint{##2sp}{##3sp}}%
  }
  \def\pgfsys@getposition##1##2{%
    \edef\pgf@marshal{\let\noexpand##2=\expandafter\noexpand\csname pgf@sys@pdf@mark@pos@##1\endcsname}%
    \pgf@marshal%
  }
  \def\pgf@sys@pdf@mark@pos@pgfpageorigin{\pgfpointorigin}
}

\endinput

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