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%D \module
%D [ file=supp-eps,
%D version=1998.05.06,
%D title=\CONTEXT\ Support Macros,
%D subtitle=\EPS\ tools,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\ifx \undefined \writestatus \input supp-mis.tex \relax \fi
%D The macros in this module are rather old and were originally
%D part of the figure inclusion macros. When \PDFTEX\ started
%D to support \PDF\ inclusion, where some accompanying macros
%D were put in \type{supp-pdf}, I considered it more suitable
%D to give the \EPS\ macros their own module.
\writestatus{loading}{ConTeXt Support Macros / EPS}
%D \macros
%D {dogetEPSboundingbox}
%D
%D The predecessors of the following macro's are derived from
%D Thomas Rockicky's macro's. They are rewritten to a more
%D compact form, made a bit more robust and also handle the
%D \type{HiResBoundingBox} and \type{ExactBoundingBox} that
%D are sometimes present.
%D
%D A bounding box has the form:
%D
%D \starttyping
%D %%BoundingBox: llx lly urx ury
%D \stoptyping
%D
%D Before we scan the file, we have to reset special
%D characters and set some others. The percentage symbol also
%D needs special treatment. When a bounding box is
%D encountered, we keep on scanning until no more directives
%D are found, i.e. a line is found that does not start with a
%D percentage symbol. We also abort scanning after finding a
%D high resolution bounding box.
%D
%D This method also works inside verbatim mode (like when we
%D are typesetting sources and putting eps coded logos into
%D a heading. Temporary restoring the \CATCODES\ is done in
%D the calling routine.
%D
%D The creator as well as external support for specials are
%D analyzed as well and their status is available in \type
%D {\EPScreator} and \type {\EPSshading}. The boundingbox
%D components are available in \type {\EPSllx} etc.
\unprotect
\def\EPSllx{0} \let\MPllx\EPSllx % just in case these
\def\EPSlly{0} \let\MPlly\EPSlly % are used while running
\def\EPSurx{0} \let\MPurx\EPSurx % in fast mode we set
\def\EPSury{0} \let\MPury\EPSury % them to 0.
\chardef\EPSfound =0
\chardef\EPScreator=0
\chardef\EPSspecial=0
\chardef\EPSstatus =0
\let\EPScreatorstring\empty
\newtoks\extraEPSpreambleresets
\newtoks\extraEPSpreambleparsers
\def\dofinishEPSfile{\dofinishfile} % no \let, can be overloaded
\def\dogetEPSboundingbox#1#2#3#4#5%
{\bgroup
\global\chardef\EPSfound \zerocount
\global\chardef\EPScreator\zerocount
\global\chardef\EPSspecial\zerocount
\global\chardef\EPSstatus \zerocount
\global\let\EPScreatorstring\empty
\the\extraEPSpreambleresets
\uncatcodespecials
\catcode`\^^M=\@@ignore
\def\doprocessEPSline
{\advance\scratchcounter\plusone
\expandafter\checkEPSboundingbox\fileline\empty\empty:.:.\end}%
\scratchcounter\zerocount
\doprocessfile\scratchread{#1}\doprocessEPSline
\egroup
% Using \EPSllx bp instead of \dimen0=1bp and \EPSllx\dimen0 is more accurate (.005pt).
\ifnum\EPSfound>\zerocount
#2\dimexpr\EPSllx\onebasepoint \relax
#3\dimexpr\EPSlly\onebasepoint \relax
#4\dimexpr\EPSurx\onebasepoint-#2\relax
#5\dimexpr\EPSury\onebasepoint-#3\relax
\else
#2\zeropoint
#3\zeropoint
#4\zeropoint
#5\zeropoint
\fi
%\message{[bbox #1: \EPSllx\space\EPSurx\space\EPSlly\space\EPSury]}\wait
\global\let\MPllx\EPSllx \global\let\MPlly\EPSlly
\global\let\MPurx\EPSurx \global\let\MPury\EPSury}
\bgroup \catcode`\%=\@@other \xdef\letterpercent{\string%} \egroup
\def\EPSboundingboxtag {BoundingBox}
\def\EPShiresboundingboxtag{HiResBoundingBox}
\def\EPSexactboundingboxtag{ExactBoundingBox}
\def\EPScreatortag {Creator}
\def\EPSmetaposttag {MetaPost}
\def\EPSmetapostspecialtag {MetaPostSpecial}
\def\EPSmetapostspecialstag{MetaPostSpecials}
\def\EPSpagetag {Page}
\let\EPSspecialstring \empty
\let\EPSspecialcontent\empty
% new metapost construct (hires bb followed by creator + version)
%
%!PS
%%BoundingBox: -71 -1 651 496
%%HiResBoundingBox: -70.9945 -0.5 650.5 495.24907
%%Creator: MetaPost 0.901
%%CreationDate: 2005.06.02:1633
%%Pages: 1
\long\def\checkEPSboundingbox#1#2#3:#4:.#5\end
{\if\string#1\letterpercent
\if\string#2\letterpercent
\edef\EPSspecialstring{#3}%
\edef\EPSspecialcontent{#4}%
\ifx\EPSspecialstring\EPScreatortag
\getEPScreatorspec
\else\ifx\EPSspecialstring\EPSboundingboxtag
\getEPSboundingboxspec
\global\chardef\EPSfound\plusone
\else\ifx\EPSspecialstring\EPShiresboundingboxtag
\getEPSboundingboxspec
\global\chardef\EPSfound\plustwo
\scratchcounter\zerocount
\else\ifx\EPSspecialstring\EPSexactboundingboxtag
\getEPSboundingboxspec
\global\chardef\EPSfound\plustwo
\scratchcounter\zerocount
\else\ifx\EPSspecialstring\EPSmetapostspecialtag % only before finish!
\global\chardef\EPSspecial\plusone % ah, we've met some MP extensions
\else\ifx\EPSspecialstring\EPSmetapostspecialstag % only before finish!
\global\chardef\EPSspecial\plusone % ah, we've met some MP extensions
\else\ifx\EPSspecialstring\EPSpagetag
\global\chardef\EPSstatus \plusone % we passed MP font defs
\else
\the\extraEPSpreambleparsers
\fi\fi\fi\fi\fi\fi\fi
\fi
\else\ifnum\EPSfound>\zerocount
% bb found
\ifnum\EPScreator=\plusone % that is, we are dealing with MP output
\ifcase\EPSstatus
% we've run into MP fontdefs
\or
\dofinishEPSfile
\fi
\else\ifnum\scratchcounter>\plusthree
% too late for mps creator (we don't want to run into crap data)
\dofinishEPSfile
\else
\fi\fi
\fi\fi}
\def\getEPSboundingboxspec
{\edef\EPSspecialstring{\EPSspecialcontent\space . . . . }%
\expandafter\dogetEPSboundingboxspec\EPSspecialstring\end}
\def\dogetEPSboundingboxspec#1 #2 #3 #4 #5\end
{\gdef\EPSllx{#1}%
\ifx\EPSllx\empty
\dogetEPSboundingboxspec#2 #3 #4 #5\end
\else
\gdef\EPSlly{#2}%
\gdef\EPSurx{#3}%
\gdef\EPSury{#4}%
\fi}
\def\getEPScreatorspec
{\edef\EPSspecialstring{\EPSspecialcontent\space . .}%
\expandafter\dogetEPScreatorspec\EPSspecialstring\end}
\def\dogetEPScreatorspec#1#2 #3\end
{\edef\EPScreatorstring{#1#2}%
\global\chardef\EPScreator\ifx\EPScreatorstring\EPSmetaposttag\plusone\else\zerocount\fi\relax}
\def\dogetEPSpreambledata#1% can be combined with \extraEPSpreambleparsers
{\bgroup
\let\dofinishEPSfile\relax % dirty trick, read past all bboxes
\dogetEPSboundingbox{#1}\!!widtha\!!heighta\!!widthb\!!heightb
\egroup}
\protect \endinput
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