pslogos.sty

\NeedsTeXFormat{LaTeX2e}[1995/12/01]
\ProvidesPackage{pslogos}[2003/07/04 A generic package for including PostScript logos]
% Emmanuel Thomé <thome@lix.polytechnique.fr>, June 2003
% freely distributable.

% Logos must be provided as Postscript procsets, and callable via a
% single command, not necessarily gsave/grestore-protected (it's done by
% the \speciak driver, dvips presumably).
%
% The baseline position must be given as a ratio, presumably between 0 and 1

\RequirePackage{publish}
\RequirePackage{keyval}

% \psl@mydivision:
%
% Divides #2 by #3, put the result in #1.
% 3digits of accuracy are enough. Both are dimensions
%
% It's done by default with the following scale-divide-unscale-roundup
% trick:
\iftrue
\def\psl@mydivision#1#2#3{%
	\bgroup@published
		\@tempdima=#2%
		\@tempdimb=#3%
		\divide\@tempdimb by256%
		\divide\@tempdima\@tempdimb
		\@tempcnta=\number\@tempdima
		\@tempdima=\@tempcnta\p@
		\divide\@tempdima by256%
		\edef#1{\strip@pt\@tempdima}%
		\publish#1%
	\egroup@published
}
\else
% I'm not completely satisfied with this trick though, so here's another
% way to do the same thing. Of course, it's horribly overkill, and much
% mcuh slower ! (and while I'm at it, I could even go for computing sines
% and cosines for doing the rotating...).
\RequirePackage{fp-basic}
\FPmessagesfalse
\def\psl@mydivision#1#2#3{%
	\bgroup@published
		\@tempdima=#2\edef\reserved@a{\strip@pt\@tempdima}%
		\@tempdimb=#3\edef\reserved@b{\strip@pt\@tempdimb}%
		\FPdiv#1\reserved@a\reserved@b
		\publish#1%
	\egroup@published
}
\fi

	
\define@key{psl@}{width}{\def\width{#1}}
\define@key{psl@}{height}{\def\height{#1}}
\define@key{psl@}{scale}{\def\scale{#1}}
\define@key{psl@}{sink}{\def\sink{#1}}
\define@key{psl@}{clip}[false]{\def\queryclip{\csname @tempswa#1\endcsname}}

\def\psl@doscl{%
	% Input: \bbh, \bbw, \width, and \height
	% If nothing is specified, we trust the \scale definition (which
	% may be also empty, btw).
	\ifx\width\relax
		\ifx\height\relax
			\ifx\scale\relax
				\@tempdima=\default@height
				\@tempdimb=\default@width
				\let\psl@scl\psl@defscl
			\else
				\@tempdima=\default@height
				\@tempdimb=\default@width
				\@tempdima=\scale\@tempdima
				\@tempdimb=\scale\@tempdimb
				\edef\psl@scl{%
					\psl@defscl\space
					\scale\space dup scale}%
			\fi
		\else
			\@tempdima=\height
			\@tempdimb=\whratio\@tempdima
			\psl@mydivision\scale\@tempdima\bbh
			\edef\psl@scl{\scale\space dup scale}%
		\fi
	\else
		\ifx\height\relax
			\@tempdimb=\width
			\@tempdima=\hwratio\@tempdimb
			\psl@mydivision\scale\@tempdimb\bbw
			\edef\psl@scl{\scale\space dup scale}%
		\else
			\@tempdima=\height
			\@tempdimb=\width
			\psl@mydivision\sx\@tempdimb\bbw
			\psl@mydivision\sy\@tempdima\bbh
			\edef\psl@scl{\sx\space\sy\space scale}%
		\fi
	\fi
}

\def\DeclarePSLogo#1#2#3#4#5#6{%
	\bgroup@published
	% #1 : intended command name
	% #2 : postscript procset name
	% #3 : postscript command name
	% #4 : Bounding Box produced.
	% #5 : Additional PS code to insert before the PS execution
	% #6 : default parameters(width/height/sink only).
	\def\reserved@a{#2}%
	\ifx\reserved@a\empty\else\special{header=\reserved@a}\fi
	\def\readbb##1 ##2 ##3 ##4\kaboom{%
		\def\llx{##1}\def\lly{##2}\def\urx{##3}\def\ury{##4}%
	}%
	\readbb#4\kaboom
	\@tempcnta=\urx\advance\@tempcnta-\llx\edef\bbw{\the\@tempcnta}%
	\@tempcnta=\ury\advance\@tempcnta-\lly\edef\bbh{\the\@tempcnta}%
	\edef\psl@clip{\llx\space\lly\space\bbw\space\bbh\space rectclip}%
	\@tempdima=\bbw bp\edef\bbw{\the\@tempdima}%
	\@tempdima=\bbh bp\edef\bbh{\the\@tempdima}%
	\psl@mydivision\whratio\bbw\bbh
	\psl@mydivision\hwratio\bbh\bbw
	\let\width\relax
	\let\scale\relax
	\let\height\relax
	\def\sink{0}% not \relax in any case !. \empty is equivalent to 1
	\iftrue
		\def\default@width\bbw
		\def\default@height\bbh
		\let\psl@defscl\empty
	\else
		\edef\width{\bbw}%
	\fi
	\setkeys{psl@}{#6}%
	\psl@doscl
	\edef\default@height{\the\@tempdima}%
	\edef\default@width{\the\@tempdimb}%
	\let\psl@defscl=\psl@scl
	\edef\psl@tsl{\llx\space neg \lly\space neg translate}%
	\edef\required@data{%
		\noexpand\def\noexpand\bbw{\bbw}%
		\noexpand\def\noexpand\bbh{\bbh}%
		\noexpand\def\noexpand\whratio{\whratio}%
		\noexpand\def\noexpand\hwratio{\hwratio}%
		\noexpand\def\noexpand\sink{\sink}%
		\noexpand\def\noexpand\default@width{\default@width}%
		\noexpand\def\noexpand\default@height{\default@height}%
		\noexpand\def\noexpand\psl@defscl{\psl@defscl}%
		\noexpand\def\noexpand\psl@clip{\psl@clip}%
		\noexpand\def\noexpand\psl@tsl{\psl@tsl}%
	}%
	\@temptokena=\expandafter{\required@data}%
	\expandafter\edef\csname#1\endcsname{\noexpand\@genericlogo{#3}{#5}{\the\@temptokena}}%
	\expandafter\publish\csname#1\endcsname
	\egroup@published
}

\def\@genericlogo#1#2#3{%
	\@ifnextchar[{%
		\@@genericlogo{#1}{#2}{#3}%
	}{%
		\@@genericlogo{#1}{#2}{#3}[]%
	}%
}

% Note: I know I'm off by 0.375% by not distinguishing bp's and pt's
% (1in=72bp=72.27pt)
\def\@@genericlogo#1#2#3[#4]{%
	% #1 : postscript command name
	% #2 : Additional PS code to insert before the PS execution
	% #3 : default parameters
	\bgroup
	#3%
	\let\width\relax
	\let\height\relax
	\let\scale\relax
	\let\clip\relax
	\def\queryclip{\@tempswafalse}%
	%
	\setkeys{psl@}{#4}%
	\psl@doscl% tempdima = height, tempdimb = width.
	\queryclip
	\if@tempswa\else
		\let\psl@clip\empty
	\fi
	\setbox0\hbox to \@tempdimb\bgroup
	\special{" \psl@scl\space\psl@tsl\space
		\psl@clip\space #2\space #1}%
	\vrule width\z@  depth\z@ height \@tempdima
	\vrule width\@tempdimb height\z@ depth\z@
	\egroup
	\@tempdima=-\ht0%
	\@tempdima=\sink\@tempdima%
	\raisebox\@tempdima{\box0}%
	\egroup
}