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%D \module
%D [ file=enco-pfr,
%D version=2000.12.10, % adapted 2005.08.14 to more delayed loading
%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.
\ifx\pdffontresource\undefined\else\endinput\fi
\writestatus{loading}{Context Encoding Macros (pdf)}
%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
% a problem is that there is always an ec vector added even when
% we switch to texnansi early; this has to do with the fact that
% we need to setup fonts at startup; this a pain when we have
% textless documents, so we should have a way around, i.e. an
% extension to pdftex where we can tag numbers inside user specs
% and attributes.
%
% currently we need to use immediate so we end up with entries
%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}} % brand 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
% {\doif{#1}\currentencoding
% {\immediate\pdfobj useobjnum \getvalue{\pdffontresource} stream {#2}}}
\long\def\startpdffontresource[#1]#2\stoppdffontresource
{\doif{#1}\currentencoding{\doifdefined\pdffontresource
{\immediate\pdfobj useobjnum \getvalue{\pdffontresource} stream {#2}}}}
%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.
% \newevery \everyfont \relax
\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}
\def\dododoincludepdffontresource#1% encoding
{\bgroup
\def\currentencoding{#1}%
\doifvaluesomething\pdffontfileresource
{\startreadingfile
\readsysfile{pdfr-\getvalue\pdffontfileresource}\donothing\donothing
\stopreadingfile
\letgvalue\pdffontfileresource\empty}%
\egroup}
\beginETEX
\def\doincludepdffontresource
{\ifcsname\s!ucmap\fontfile\endcsname\else
\dodoincludepdffontresource
\fi}
\def\dodoincludepdffontresource
{% does this font has an encoding specified vector
\doifsomething\currentencoding % no \ifx
{% is there a pdf font encoding resource file defined
\ifcsname\pdffontresource\endcsname
% (fake) object defined
\else\ifcsname\pdffontfileresource\endcsname
% is there a resource already included
\doifsomething\pdffontfileresource
{\pdfobj reserveobjnum {}%
\setxvalue\pdffontresource{\the\pdflastobj}%
\doglobal\appendetoks
\noexpand\dododoincludepdffontresource{\currentencoding}%
\to \everybeforeshipout}% prevent multiple loading
\fi\fi
\ifcsname\pdffontresource\endcsname
\expanded{\pdffontattr\font{/ToUnicode \csname\pdffontresource\endcsname\space0 R}}%
% do it only once for each font
\letgvalue{\s!ucmap\fontfile}\empty
\fi}}
\endETEX
\beginTEX
\def\doincludepdffontresource
{\expandafter\ifcsname\s!ucmap\fontfile\endcsname\relax
\dodoincludepdffontresource
\fi}
\def\dodoincludepdffontresource
{\doifsomething\currentencoding % no \ifx
{\expandafter\ifx\csname\pdffontresource\endcsname\relax
\expandafter\ifx\csname\pdffontfileresource\endcsname\relax\else
\doifsomething\pdffontfileresource
{\pdfobj reserveobjnum {}%
\setxvalue\pdffontresource{\the\pdflastobj}%
\doglobal\appendetoks
\noexpand\dododoincludepdffontresource{\currentencoding}%
\to \everybeforeshipout}% prevent multiple loading
\fi
\fi
\expandafter\ifx\csname\pdffontresource\endcsname\relax\else
\expanded{\pdffontattr\font{/ToUnicode \csname\pdffontresource\endcsname\space0 R}}%
% do it only once for each font
\letgvalue{\s!ucmap\fontfile}\empty
\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 \type {enco-*.tex}.
%D
%D Test:
%D
%D \starttyping
%D \useencoding[pfr] \usetypescript[palatino][ec] \setupbodyfont[palatino]
%D
%D \starttext
%D fi ff ffi
%D \stoptext
%D \stoptyping
\startencoding [il2] \usepdffontresource il2 \stopencoding
\startencoding [ec] \usepdffontresource ec \stopencoding
\protect \endinput
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