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% 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.





% The aux files, needed for reading back coordinates
\def\pgfutil@aux@read@hook{
  \pgfutil@IfFileExists{\jobname.pgf}{\input \jobname.pgf\relax}{}
  \csname newwrite\endcsname\pgfutil@auxout
  \csname openout\endcsname\pgfutil@auxout\jobname.pgf
}


% XColor-like support for plain TeX

\def\pgfutil@definecolor#1#2#3{\csname pgfutil@emu@#2\endcsname{#1}#3\@nil}

\def\pgfutil@emu@rgb#1#2,#3,#4\@nil{\expandafter\def\csname\string\color@#1\endcsname{\xcolor@{}{}{rgb}{#2,#3,#4}}}
\def\pgfutil@emu@gray#1#2\@nil{\expandafter\def\csname\string\color@#1\endcsname{\xcolor@{}{}{rgb}{#2,#2,#2}}}

\pgfutil@definecolor{white}{gray}{1}
\pgfutil@definecolor{black}{gray}{0}
\pgfutil@definecolor{gray}{gray}{0.5}
\pgfutil@definecolor{red}{rgb}{1,0,0}
\pgfutil@definecolor{green}{rgb}{0,1,0}
\pgfutil@definecolor{blue}{rgb}{0,0,1}
\pgfutil@definecolor{cyan}{rgb}{0,1,1}
\pgfutil@definecolor{magenta}{rgb}{1,0,1}
\pgfutil@definecolor{yellow}{rgb}{1,1,0}
\pgfutil@definecolor{orange}{rgb}{1,0.5,0}
\pgfutil@definecolor{violet}{rgb}{0.5,0,0.5}
\pgfutil@definecolor{purple}{rgb}{0.75,0,0.25}
\pgfutil@definecolor{brown}{rgb}{0.75,0.5,0.25}

\def\pgfutil@color#1{%
  \pgfutil@colorlet{.}{#1}%
  \pgfsysprotocol@getcurrentprotocol\pgfutil@emu@temp%
  {%
    \pgfsysprotocol@setcurrentprotocol\pgfutil@empty%
    \pgfsysprotocol@bufferedtrue%
    \pgfsetcolor{.}%
    \expandafter\pgfsys@outerinvoke\expandafter{\pgfsysprotocol@currentprotocol}%
  }%
  \pgfsysprotocol@setcurrentprotocol\pgfutil@emu@temp%
  \aftergroup\pgfutil@reset@color%                
}

\def\pgfutil@extractcolorspec#1#2{%
  \def#2{{#1}}%
}

\def\pgfutil@convertcolorspec#1#2#3{%
  \edef#3{\expandafter\expandafter\expandafter\pgfutil@emu@select\csname\string\color@#1\endcsname}%
}


\def\pgfutil@doifcolorelse#1#2#3{%
  \expandafter\ifx\csname\string\color@#1\endcsname\relax%
    \let\pgf@next=\pgfutil@secondoftwo%
  \else
    \let\pgf@next=\pgfutil@firstoftwo%
  \fi%
  \pgf@next{#2}{#3}%  
}


\def\pgfutil@reset@color{%
  \pgfsysprotocol@getcurrentprotocol\pgfutil@emu@temp%
  {%
    \pgfsysprotocol@setcurrentprotocol\pgfutil@empty%
    \pgfsysprotocol@bufferedtrue%
    \pgfsetcolor{.}%
    \expandafter\pgfsys@outerinvoke\expandafter{\pgfsysprotocol@currentprotocol}%
  }%
  \pgfsysprotocol@setcurrentprotocol\pgfutil@emu@temp%
}
\expandafter\def\csname\string\color@.\endcsname{\xcolor@{}{}{rgb}{0,0,0}}

\def\pgfutil@colorlet#1#2{%
  \edef\pgf@marshal{#2}%
  \expandafter\pgfutil@in@\expandafter!\expandafter{\pgf@marshal}%
  \ifpgfutil@in@%
    % compute mixture
    {%
      \expandafter\pgfutil@emu@mix\pgf@marshal!white!\@nil%
      \xdef\pgf@marshal{\noexpand\def\expandafter\noexpand\csname\string\color@#1\endcsname{%
          \noexpand\xcolor@{}{}{rgb}{\pgf@sys@tonumber\pgf@xa,\pgf@sys@tonumber\pgf@xb,\pgf@sys@tonumber\pgf@xc}}}%
    }%
    \pgf@marshal%
  \else%
    \edef\pgf@marshal{\noexpand\let\expandafter\noexpand\csname\string\color@#1\endcsname=%
                      \expandafter\noexpand\csname\string\color@#2\endcsname}%
    \pgf@marshal%
  \fi%  
}
\def\pgfutil@emu@mix#1!#2!#3!#4\@nil{%
  \expandafter\expandafter\expandafter\pgfutil@emu@unpack\csname\string\color@#1\endcsname%
  \pgf@ya=\pgf@xa%
  \pgf@yb=\pgf@xb%
  \pgf@yc=\pgf@xc%
  \expandafter\expandafter\expandafter\pgfutil@emu@unpack\csname\string\color@#3\endcsname%
  \c@pgf@counta=#2\relax%
  \c@pgf@countb=100\relax%
  \advance\c@pgf@countb by-\c@pgf@counta\relax%
  \pgf@xa=\c@pgf@countb\pgf@xa%
  \advance\pgf@xa by\c@pgf@counta\pgf@ya%
  \divide\pgf@xa by 100\relax%
  \pgf@xb=\c@pgf@countb\pgf@xb%
  \advance\pgf@xb by\c@pgf@counta\pgf@yb%
  \divide\pgf@xb by 100\relax%
  \pgf@xc=\c@pgf@countb\pgf@xc%
  \advance\pgf@xc by\c@pgf@counta\pgf@yc%
  \divide\pgf@xc by 100\relax%
}
\def\pgfutil@emu@unpack#1#2#3#4#5{%
  \pgfutil@emu@@unpack#5\@nil%
}
\def\pgfutil@emu@@unpack#1,#2,#3\@nil{%
  \pgf@xa=#1pt%
  \pgf@xb=#2pt%
  \pgf@xc=#3pt%
}

\def\pgfutil@emu@select#1#2#3#4#5{#5}



\let\definecolor=\pgfutil@definecolor
\let\color=\pgfutil@color
\let\colorlet=\pgfutil@colorlet
\let\extractcolorspec=\pgfutil@extractcolorspec
\let\convertcolorspec=\pgfutil@convertcolorspec




% pgfutil@minipage

\def\pgfutil@minipage[#1]#2{%
  \hbox to#2\bgroup%
    \hsize=#2\relax%
    \vbox\bgroup\leavevmode%
}
\def\pgfutil@endminipage{\egroup\egroup}



% Driver detector (not so good):

\ifx\pdfoutput\@undefined\alloc@0\count\countdef\insc@unt\pdfoutput\fi
\ifx\pdfoutput\relax\alloc@0\count\countdef\insc@unt\pdfoutput\fi

\def\pgfutil@guessdriver{
  \ifcase\pdfoutput%
    \ifx\XeTeXversion\@undefined
      \def\pgfsysdriver{pgfsys-dvips.def}% hopefully
    \else
      \def\pgfsysdriver{pgfsys-xetex.def}% should be right
    \fi
  \else%
    \def\pgfsysdriver{pgfsys-pdftex.def}% should be right
  \fi%
}

  

% Global colors

\let\pgfutil@globalcolorsfalse=\relax
\let\pgfutil@globalcolorstrue=\relax



% Font stuff

\def\pgfutil@font@tiny{\fam\z@\fiverm}            % How to do this correctly?
\def\pgfutil@font@scriptsize{\fam\z@\sevenrm}
\def\pgfutil@font@footnotesize{\rm}
\def\pgfutil@font@small{\fam\z@\ninerm}
\def\pgfutil@font@normalsize{\rm}
\def\pgfutil@font@large{\rm}
\def\pgfutil@font@Large{\rm}
\def\pgfutil@font@huge{\rm}
\def\pgfutil@font@Huge{\rm}

\def\pgfutil@font@itshape{\it}
\def\pgfutil@font@bfseries{\bf}

\let\pgfutil@font@normalfont=\rm

\let\pgfutil@selectfont=\rm


% Extra counters, registers, boxes

\newcount\pgfutil@tempcnta
\newcount\pgfutil@tempcntb

\newbox\pgfutil@tempboxa

\newdimen\pgfutil@tempdima
\newdimen\pgfutil@tempdimb


% Module stuff

\def\pgfutil@usemodule#1{\input #1.tex}



% End of file stuff

\let\pgfutil@origend=\end
\def\end{\the\pgfutil@everybye\pgfutil@origend}

% Link to existing stuff
\let\pgfutil@voidb@x\voidb@x
\let\pgfutil@toks@\toks@




% Hack shipout. Should perhaps use atbegshi? Not in standard distribution, currently... 
% Code inspired (but patched...) from everyshi.sty:

\def\pgfutil@insertatbegincurrentpagefrombox#1{%
  \global\setbox\pgfutil@abb\hbox{\unhbox\pgfutil@abb#1}%
}
\newbox\pgfutil@abb%
\def\pgfutil@insertatbegincurrentpage#1{%
  \expandafter\gdef\expandafter\pgfutil@abc\expandafter{\pgfutil@abc#1}%
}
\let\pgfutil@abc\pgfutil@empty%
\def\pgfutil@insertatbegineverypage#1{%
  \expandafter\gdef\expandafter\pgfutil@abe\expandafter{\pgfutil@abe#1}%
}
\let\pgfutil@abe\pgfutil@empty%

\def\pgfutil@@EveryShipout@Shipout{%
  \afterassignment\pgfutil@@EveryShipout@Test
  \setbox255= %
}
\def\pgfutil@@EveryShipout@Test{%
  \ifvoid\@cclv\relax
    \aftergroup\pgfutil@EveryShipout@Output
  \else
    \pgfutil@EveryShipout@Output
  \fi%
}
\def\pgfutil@EveryShipout@Output{%
  \setbox255=\vbox{%
    \setbox0=\hbox{\pgfutil@abe\unhbox\pgfutil@abb\pgfutil@abc\global\let\pgfutil@abc\pgfutil@empty}%
    \wd0=0pt%
    \ht0=0pt%
    \dp0=0pt%
    \box0%
    \unvbox255%
  }%
  \pgfutil@@EveryShipout@Org@Shipout\box\@cclv%
}
\let\pgfutil@@EveryShipout@Org@Shipout\shipout
\let\shipout\pgfutil@@EveryShipout@Shipout



% The following is still messy and needs to be cleanup up (everything
% prefixed by pgfutil@): 

\def\PackageInfo#1#2{}
\def\PackageWarning#1#2{\immediate\write17{Package #1: Warning! #2.}}%
\def\PackageError#1#2#3{\immediate\write17{Package #1: Error! #2.}}%
\long\def\AtBeginDocument#1{#1}%

\endinput

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