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%D \module
%D [ filefile=enco-pfr,
%D version=2000.12.10,
%D title=\CONTEXT\ Encoding Macros,
%D subtitle=PDF Font Resource Inclusion,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA / Hans Hagen \& Ton Otten}]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
%D This is an experimental module in which we implement
%D font resource inclusion in \PDF. One reason to include
%D font resources is that it enables a search engine to
%D perform a search (I'm told). This feature ws requested by
%D Petr Ferdus from Czech.
%D A simple test file may look like this (watch how we first
%D load the encoding and then the font; previous font
%D definitions are left untouched.)
%D
%D \starttyping
%D % output=pdftex interface=en
%D
%D \useencoding[pfr]
%D \setupbodyfont[csr]
%D
%D \starttext
%D test \`z \'z \bf test \sl test \bs quite funny \`z \page
%D test \`z \'z \bf test \sl test \bs quite funny \`z \page
%D \stoptext
%D \stoptyping
%D
%D We do our best to include a (often large) font resources
%D only once. The current implementation is not that
%D general which is also due to the fact that \type
%D {\pdffontattr} is expanded instantly and persistent. A
%D more versatile (but also slower) approach is to keep track
%D of the fonts and either flush the information at shipout
%D time, or at the end of the document.
\unprotect
%D \macros
%D {ifincludepdffontresources}
%D
%D You can turn of this feature using the following switch.
\newif\ifincludepdffontresources \includepdffontresourcestrue
%D The name of the resource is stored in a macro, as is its
%D object reference. A resource is only processed once. When
%D done, the resource name is erased, and we use this fact to
%D prevent redefinition as well as well as reloading. So, a
%D macro defined with \type {\pdffontfileresource} can have
%D three states:
%D
%D \startitemize[packed]
%D \item undefined: not yet loaded, and not yet included
%D \item some value: loaded, but not yet included
%D \item empty: loaded, and already included
%D \stopitemize
\def\pdffontresource {pdfr:\currentencoding}
\def\pdffontfileresource{pdff:\pdffontresource}
%D A resource is defined in a file prefixed by \type {pdfr-}.
%D The following \PDF\ code is composed by Ondrej Koala Vacha (I
%D probably mispelled this name).
%D
%D \starttyping
%D \startpdffontresource[il2]
%D /CIDInit /ProcSet findresource begin
%D 12 dict begin
%D begincmap
%D /CIDSystemInfo
%D << /Registry (Adobe)
%D /Ordering (T1UV)
%D /Supplement 0
%D >> def
%D /CMapName /Adobe-Identity-UCS def
%D /CMapType 1 def
%D 1 begincodespacerange
%D <00> <FF>
%D endcodespacerange
%D %%FontSpecificEncoding
%D 191 beginbfrange
%D <20> <20> <0020> % space dec: 32 oct:040 hex:20
%D .... .... ...... . ........ .... .. ....... ......
%D <ff> <ff> <00ff> % dotaccent dec:255 oct:377 hex:ff
%D endbfrange
%D endcmap
%D CMapName currentdict /CMap defineresource pop end
%D end
%D \stoppdffontresource
%D \stoptyping
%D
%D We don't preload such huge definitions, and process them
%D run||time to save memory. Therefore, in the encoding
%D vector, we only add an entry like:
%D
%D \starttyping
%D \startencoding [il2]
%D \usepdffontresource il2
%D \stopencoding
%D \stoptyping
%D
%D This macro is defined as follows.
\def\usepdffontresource #1 %
{\doifundefinedelse{\pdffontfileresource} % okay, undefined, so either
{\setxvalue{\pdffontfileresource}{#1}} % band new, or not yet loaded
{\doifvaluesomething{\pdffontfileresource} % only if not loaded in which
{\setxvalue{\pdffontfileresource}{#1}}}} % case it's made empty
%D Watch how we check for duplicated loading. The resource
%D itself, when asked for, is included immediately, after which
%D we save its reference. Normally a document will have one
%D such a resource.
\long\def\startpdffontresource[#1]#2\stoppdffontresource%
{\donefalse % we use boolean due to \par
\doifundefined{\pdffontresource}% should be \long
{\doif{#1}{\currentencoding}{\donetrue}}%
\ifdone
\immediate\pdfobj stream {#2}%
\setxvalue{\pdffontresource}{\the\pdflastobj}%
\fi}
%D The reference to such a vector is to be handled at font
%D definition time, which is why we hook it into the font
%D loading routine. A little bit of indirectness speeds up
%D the process when this feature is disabled and keeps the
%D macros readable.
\appendtoksonce \includepdffontresource \to \everyfont
\def\includepdffontresource
{\ifincludepdffontresources
\ifx\pdffontattr\undefined
% we're not using (a recent version of) pdftex
\else\ifcase\pdfoutput
% we're not in pdf mode
\else
\doincludepdffontresource
\fi\fi
\fi}
\beginETEX
\def\doincludepdffontresource
{\ifcsname\s!ucmap\fontfile\endcsname\else
\dodoincludepdffontresource
\fi}
\def\dodoincludepdffontresource%
{% does this font has an encoding specified
\ifx\currentencoding\empty \else \ifx\currentencoding\s!default \else
% is there a pdf font encoding resource file defined
\ifcsname\pdffontfileresource\endcsname
% load the pdf font resource
\edef\xpdffontfileresource{\csname\pdffontfileresource\endcsname}%
\ifx\xpdffontfileresource\empty \else
% but load it only once
\startreadingfile
\readsysfile{pdfr-\xpdffontfileresource}{}{}% messages
\stopreadingfile
% but do that only once, so forget the flag, empty==loaded
\global\@EA\let\csname\pdffontfileresource\endcsname\empty
\fi
\fi
% is there a resource indeed, i.e. an object reference
\ifcsname\pdffontresource\endcsname
% if so, create a reference to the object
\expanded{\pdffontattr\font % current font
{/ToUnicode \csname\pdffontresource\endcsname\space0 R}}%
\fi
\global\@EA\let\csname\s!ucmap\fontfile\endcsname\empty
\fi \fi}
\endETEX
\beginTEX
\def\doincludepdffontresource
{\@EA\ifx\csname\s!ucmap\fontfile\endcsname\relax
\dodoincludepdffontresource
\fi}
\def\dodoincludepdffontresource%
{\ifx\currentencoding\empty \else \ifx\currentencoding\s!default \else
\@EA\ifx\csname\pdffontfileresource\endcsname\relax\else
\edef\xpdffontfileresource{\csname\pdffontfileresource\endcsname}%
\ifx\xpdffontfileresource\empty \else
\startreadingfile
\readsysfile{pdfr-\xpdffontfileresource}{}{}%
\stopreadingfile
\global\@EA\let\csname\pdffontfileresource\endcsname\empty
\fi
\fi
\@EA\ifx\csname\pdffontresource\endcsname\relax\else
\expanded{\pdffontattr\font
{/ToUnicode \csname\pdffontresource\endcsname\space0 R}}%
\fi
\global\@EA\let\csname\s!ucmap\fontfile\endcsname\empty
\fi\fi}
\endTEX
%D For the moment, we keep this definition here, if only
%D because \type {\usepdffontencoding} is not defined in the
%D core. In the end, this will go to enco-il2.
\startencoding [il2]
\usepdffontresource il2
\stopencoding
\protect \endinput
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