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%D \module
%D [ file=back-pdf,
%D version=2009.04.15,
%D title=\CONTEXT\ Backend Macros,
%D subtitle=\PDF,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=\PRAGMA]
%C
%C This module is part of the \CONTEXT\ macro||package and is
%C therefore copyrighted by \PRAGMA. See mreadme.pdf for
%C details.
\writestatus{loading}{ConTeXt Backend Macros / PDF}
\registerctxluafile{back-pdf}{1.001} % this will change
\unprotect
%D We will minimize the number of calls to \PDF\ specific primitives
%D and delegate all management and injection of code to the backend.
%D
%D Here we initialize some internal quantities.
\pdfoutput = 1
\pdfhorigin = 1 true in
\pdfvorigin = 1 true in
\pdfimageresolution = 300
\pdfpkresolution = 600
\pdfdecimaldigits = 10
\pdfinclusionerrorlevel = 0
\pdfminorversion = 6 % maybe even 7
%pdfuniqueresname = 1
%D This one can be consulted by users although the suffix is also
%D a system mode.
\setjobsuffix{pdf}
%D For the moment we keep these.
\newtoks \pdfbackendeveryximage
\newtoks \pdfbackendeveryxform
%D These are the only official methods to add stuff to the resources.
\def\pdfbackendsetcatalog #1#2{\ctxlua{lpdf.addtocatalog ("#1",\!!bs#2\!!es)}}
\def\pdfbackendsetinfo #1#2{\ctxlua{lpdf.addtoinfo ("#1",\!!bs#2\!!es)}}
\def\pdfbackendsetname #1#2{\ctxlua{lpdf.addtonames ("#1",\!!bs#2\!!es)}}
\def\pdfbackendsetpageattribute #1#2{\ctxlua{lpdf.addtopageattributes ("#1",\!!bs#2\!!es)}}
\def\pdfbackendsetpagesattribute#1#2{\ctxlua{lpdf.addtopagesattributes("#1",\!!bs#2\!!es)}}
\def\pdfbackendsetpageresource #1#2{\ctxlua{lpdf.addtopageresources ("#1",\!!bs#2\!!es)}}
\def\pdfbackendsetextgstate #1#2{\ctxlua{lpdf.adddocumentextgstate ("#1",lpdf.verbose(\!!bs#2\!!es))}}
\def\pdfbackendsetcolorspace #1#2{\ctxlua{lpdf.adddocumentcolorspace("#1",lpdf.verbose(\!!bs#2\!!es))}}
\def\pdfbackendsetpattern #1#2{\ctxlua{lpdf.adddocumentpattern ("#1",lpdf.verbose(\!!bs#2\!!es))}}
\def\pdfbackendsetshade #1#2{\ctxlua{lpdf.adddocumentshade ("#1",lpdf.verbose(\!!bs#2\!!es))}}
\def\pdfbackendcurrentresources {\ctxlua{lpdf.collectedresources()}}
%D Let's block these:
\let\pdfcatalog \relax \newtoks\pdfcatalog
\let\pdfinfo \relax \newtoks\pdfinfo
\let\pdfnames \relax \newtoks\pdfnames
\let\pdfpageresources\relax \newtoks\pdfpageresources
\let\pdfpageattr \relax \newtoks\pdfpageattr
\let\pdfpagesattr \relax \newtoks\pdfpagesattr
%D An example of usage is:
\appendtoks
\pdfbackendsetinfo{ConTeXt.Version}{\contextversion}%
\pdfbackendsetinfo{ConTeXt.Time} {\number\normalyear.\twodigits\normalmonth.\twodigits\normalday\space \twodigits\currenthour:\twodigits\currentminute}%
\pdfbackendsetinfo{ConTeXt.Jobname}{\jobname}%
\pdfbackendsetinfo{ConTeXt.Url} {www.pragma-ade.com}%
\to \everylastbackendshipout
%D Unfortunately this is still needed (also for \METAPOST\ to
%D \PDF\ converter):
% \def\doresetmapfilelist
% {\global\let\doresetmapfilelist\relax
% \pdfmapfile{original-empty.map}}
%
% \appendtoksonce \loadallfontmapfiles \to \pdfbackendeveryxform
% \appendtoksonce \loadallfontmapfiles \to \pdfbackendeveryximage
%D Transformations. Some day we will use primitives (once they're fixed).
\def\dostartrotation#1% grouped
{\forcecolorhack
\pdfliteral{q \ctxlua{lpdf.rotationcm(#1)}}}
\def\dostoprotation
{\pdfliteral{Q}}
\def\dostartscaling#1#2% the test is needed because acrobat is bugged!
{\forcecolorhack
\pdfliteral{q \ifdim#1\points=\zeropoint.0001\else#1\fi\space 0 0
\ifdim#2\points=\zeropoint.0001\else#2\fi\space 0 0 cm}}
\def\dostopscaling
{\pdfliteral{Q}}
\def\dostartmirroring{\pdfliteral{-1 0 0 1 0 0 cm}}
\def\dostopmirroring {\pdfliteral{-1 0 0 1 0 0 cm}}
\def\dostartclipping#1#2#3% todo (still needed?)
{\PointsToBigPoints{#2}\width
\PointsToBigPoints{#3}\height
\grabMPclippath{#1}{1}\width\height{0 0 m \width\space 0 l \width \height l 0 \height l}%
\pdfliteral{q 0 w \MPclippath\space W n}}
\def\dostopclipping
{\pdfliteral{Q n}}
%D The following will move to the backend \LUA\ code:
\appendtoks \ctxlua{backends.codeinjections.finalizepage ()}\to \everybackendshipout % is immediate
%appendtoks \ctxlua{backends.codeinjections.finalizedocument()}\to \everylastbackendshipout % is immediate
%D Temporary hack, will be removed or improved or default.
\def\TransparencyHack{\ctxlua{backends.codeinjections.addtransparencygroup()}}
%D \macros
%D {dostartobject,dostopobject,doinsertobject}
%D This will change:
\newbox\objectbox
\def\dostartobject#1#2#3#4#5%
{\bgroup
\setbox\objectbox\vbox\bgroup
\def\dodostopobject{\egroup\doregisterobject{#1}{#2}}}
\def\dostopobject
{\dodostopobject
\egroup}
\def\doregisterobject#1#2%
{\the\pdfbackendeveryxform
\finalizeobjectbox\objectbox
\immediate\pdfxform resources {\pdfbackendcurrentresources}\objectbox
\dosetobjectreference{#1}{#2}{\the\pdflastxform}}
\def\doresetobjects
{}
\def\doinsertobject#1#2%
{\begingroup
\doifobjectreferencefoundelse{#1}{#2}
{\dogetobjectreference{#1}{#2}\PDFobjectreference\pdfrefxform\PDFobjectreference}%
\donothing
\endgroup}
\def\doPDFgetobjectpage#1#2#3%
{\dogetobjectreferencepage{#1}{#2}#3%
\ifx#3\empty\def#3{\realfolio}\fi}
\def\doPDFgetobjectpagereference#1#2#3%
{\dogetobjectreferencepage{#1}{#2}#3%
\doPDFgetpagereference{\ifx#3\empty\realfolio\else#3\fi}#3}
\let\lastpredefinedsymbol\empty % some day we can do more at the lua end
\def\predefinesymbol[#1]%
{\begingroup
\xdef\lastpredefinedsymbol{#1}%
\settightobject{SYM}{#1}\hbox{\symbol[#1]}% to be checked ... maybe only fitting
\dogetobjectreference{SYM}{#1}\lastref
\ctxlua{backends.codeinjections.registersymbol("#1",\lastref)}%
\endgroup}
\protect \endinput
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