% 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.


\catcode`\@=11\relax

\pgfutil@format@is@latextrue

\let\pgfutil@auxout=\@auxout
\def\pgfutil@writetoaux#1{\if@filesw\write\pgfutil@auxout{#1}\fi}

\let\pgfutil@tempcnta=\@tempcnta
\let\pgfutil@tempcntb=\@tempcntb
\let\pgfutil@voidb@x=\voidb@x
\let\pgfutil@toks@=\toks@

\let\pgfutil@packageerror=\PackageError
\let\pgfutil@packagewarning=\PackageWarning

\def\pgfutil@protect{\protect}


\def\pgfutil@definecolor{\definecolor}
\def\pgfutil@color{\color}
\def\pgfutil@colorlet{\colorlet}
\def\pgfutil@extractcolorspec{\extractcolorspec}
\def\pgfutil@convertcolorspec{\convertcolorspec}

\def\pgfutil@globalcolorsfalse{\let\ifglobalcolors\iffalse}
\def\pgfutil@globalcolorstrue{\let\ifglobalcolors\iftrue}

\let\pgfutil@minipage=\minipage
\let\pgfutil@endminipage=\endminipage

\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}%  
}

\let\pgfutil@raggedleft\raggedleft
\let\pgfutil@raggedright\raggedright

\let\pgfutil@flushglue=\@flushglue

\def\pgfutil@font@tiny{\tiny}
\def\pgfutil@font@scriptsize{\scriptsize}
\def\pgfutil@font@footnotesize{\footnotesize}
\def\pgfutil@font@small{\small}
\def\pgfutil@font@normalsize{\normalsize}
\def\pgfutil@font@large{\large}
\def\pgfutil@font@Large{\Large}
\def\pgfutil@font@huge{\huge}
\def\pgfutil@font@Huge{\Huge}

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

\def\pgfutil@font@normalfont{\normalfont}

\def\pgfutil@usemodule#1{\usepackage{#1}}

\let\pgfutil@selectfont=\selectfont

\let\pgfutil@tempboxa=\@tempboxa

\let\pgfmath@tempdima\pgfutil@tempdima
\let\pgfmath@tempdima\pgfutil@tempdima
\let\pgfmath@tempcnta\pgfutil@tempcnta
\let\pgfmath@tempcntb\pgfutil@tempcntb

\def\pgfutil@check@rerun#1#2{\@newl@bel{pgf@lab}{#1}{#2}}

\AtBeginDocument{\AtEndDocument{\par\vfil\penalty-10000\relax\the\pgfutil@everybye}}

\def\pgfutil@insertatbegincurrentpagefrombox#1{%
  \edef\pgf@temp{\the\wd\pgfutil@abb}%
  \global\setbox\pgfutil@abb\hbox{%
  	\unhbox\pgfutil@abb% 
	%
	% the order in which \pgfutil@insertatbegincurrentpagefrombox
	% matters unless we make the following -shift!
	% To see this, consider writing two such statements. The second
	% one will (naturally) be placed more to the right, although there
	% is no apparent reason why it should.
	%
	% CF observed problems when placing patterns in XObjects without
	% this skip (dvipdfmx driver for pgfplots shader=interp)
	\hskip-\pgf@temp\relax%
	#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%

\RequirePackage{everyshi}
\EveryShipout{%
  % Add at begin page stuff
 \setbox\@cclv=\vbox{%
    \setbox\z@=\hbox{%
		% the boxes \pgfutil@abe ("every page") and \pgfutil@abb ("current page")
		% are used to generate pdf objects / dictionaries which are
		% required for the graphics which are somewhere in the "real"
		% page content.
		% BUT: these pdf objects MUST NOT be affected by text layout
		% shifts! Consequently, we have to undo \hoffset and \voffset
		% (which are h/v shifts to the page layout).
		%
		% Note that this of importance for shadings. To be more
		% specific: try out shadings with standalone (which uses
		% \hoffset) and with xdvipdfmx (which appears to be more
		% fragile than pdflatex) - they break unless we undo \hoffset
		% and \voffset.
		\ifdim\hoffset=0pt \else \hskip-\hoffset\fi
		\pgfutil@abe\unhbox\pgfutil@abb\pgfutil@abc\global\let\pgfutil@abc\pgfutil@empty
		\ifdim\hoffset=0pt \else \hskip+\hoffset\fi
	}%
    \wd\z@=\z@%
    \ht\z@=\z@%
    \dp\z@=\z@%
	% ... see remark above regarding \hoffset/\voffset:
	\ifdim\voffset=0pt \else \vskip-\voffset\fi
    \box\z@%
	\ifdim\voffset=0pt \else \vskip+\voffset\fi
	%
	% if TeX changes into vertical mode, it inserts \parskip and
	% \lineskip. Disable it here:
    \nointerlineskip%
    \ifvbox\@cclv \unvbox\@cclv \else\hsize=\wd\@cclv \noindent\unhbox\@cclv \fi%
	%\box\@cclv
	% using \box instead of \unhbox or \unvbox 
	% has the advantage that glue settings won't be
	% altered (as for \unhbox/\unvbox). But \box breaks compatibility
	% with the 'remember picture' feature.
  }%
}

% Preview hack: preview.sty hacks into \shipout (which is ok), but
% does not honour everyshi.sty (which is not ok). This causes everyshi
% material to get lost.
\AtBeginDocument{
    \@ifpackageloaded{preview}{%
        % Ok, package loaded. Swap definitions of everyshi.sty's shipout
        % and preview.sty's shipout:
        \ifPreview
            \let\shipout\@EveryShipout@Org@Shipout%This is the null version of \shipout, created by preview and saved by everyshi
            \let\@EveryShipout@Org@Shipout\pr@shipout% This is the original shipout
            \let\pr@shipout\@EveryShipout@Shipout%
        \fi
        }{}%
}
   
% Guess the driver:

\def\pgfutil@guessdriver{
  \ifx\HCode\@undefined% 
    \edef\pgfsysdriver{pgfsys-\Gin@driver}% should be right
  \else%
    \def\pgfsysdriver{pgfsys-tex4ht.def}% should be right
  \fi%
}


\endinput
