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+%% Copyright (C) 2007 by Michael Ritzert <michael.ritz...@gmail.com>
+%% Spurious spaces removed by John Bowman [2009/06/01].
+%% Global macros to find the number of a PDF OCG object from its LaTeX
+%% reference contributed by Paul Gaborit [2012/09/13].
+
+\NeedsTeXFormat{LaTeX2e}
+\ProvidesPackage{ocg}[2012/09/13]
+
+\RequirePackage{ifpdf}
+\ifpdf
+\else
+ \PackageWarningNoLine{ocg}{%
+ Loading aborted, because pdfTeX is not running in PDF mode%
+ }%
+ \expandafter\endinput
+\fi
+
+\DeclareOption*{}\ProcessOptions*\relax %allow anything as option for the moment
+
+%testing for correct pdfTeX version
+%TODO: find out minimum required version!
+\ifnum\pdftexversion<120
+ \PackageError{ocg}{%
+ pdfeTeX, version >= 1.20, required%
+ }{%
+ Install a newer version!%
+ }%
+\fi
+
+% Next OCG id -- TODO: autogenerate. but keep possibility to reopen an OCG.
+\newcount\@ocg@num\@ocg@num=0
+
+\gdef\@ocg@layersnames{}
+
+% called from the aux file
+\def\@ocg@makeknown#1#2#3{% #1: OCG name, #2: OC id, #3: on/off
+ \@ifundefined{OCG#2}{%
+ \message{OCG#2}
+ \expandafter\gdef\csname OCG#2\endcsname{#1}%
+ \immediate\pdfobj{<< /Type /OCG /Name (#1) >>}% new ocg
+ \xdef\@ocg@curocg{\the\pdflastobj\space 0 R}% reference to id
+ \expandafter\xdef\csname OCGpdfobj#2\endcsname{\@ocg@curocg}
+ \xdef\@ocg@ocgs{\@ocg@ocgs\space\@ocg@curocg}% list of all OCGs in "first defined" order
+ \ifnum#3=1 %on
+ \xdef\@ocg@ocgson{\@ocg@ocgson\space\@ocg@curocg}% list of all default-on OCGs
+ \else%
+ \xdef\@ocg@ocgsoff{\@ocg@ocgsoff\space\@ocg@curocg}% list of all default-off OCGs
+ \fi%
+ \xdef\@ocg@layersnames{%
+ \@ocg@layersnames\space/OC#2\space\@ocg@curocg% name-to-id mapping
+ }%
+ }{%
+ \message{OCG#2 reopened}
+ % layer reopened
+ }
+}
+
+\AtBeginDocument{%
+ % the auxfile has been read if available. register the OCGs in the page resources.
+ \@ocg@addresource
+ \let\@ocg@makeknown\@gobble
+}
+
+% set page resources to include the layers defined in the aux file
+\def\@ocg@addresource{%
+ \immediate\pdfobj{<<\@ocg@layersnames\space>>}%
+ \xdef\@ocg@namesobj{\the\pdflastobj\space 0 R}%
+ % append to pageresources
+ \begingroup
+ \edef\x{\endgroup
+ \pdfpageresources{%
+ \the\pdfpageresources
+ /Properties \@ocg@namesobj%
+ }%
+ }%
+ \x
+}
+
+\newcount\@ocg@@ocgs
+\pdfobj reserveobjnum
+\@ocg@@ocgs=\pdflastobj
+
+\newcount\@ocg@@layersconfig
+\pdfobj reserveobjnum
+\@ocg@@layersconfig=\pdflastobj
+
+\pdfcatalog{%
+ /OCProperties <<
+ /OCGs \the\@ocg@@ocgs\space0 R\space
+ /D \the\@ocg@@layersconfig\space0 R\space
+ >>%
+}
+\def\@ocg@ocgs{}
+\def\@ocg@ocgson{}
+\def\@ocg@ocgsoff{}
+\AtEndDocument{%
+ \immediate\pdfobj useobjnum \@ocg@@ocgs {%
+ [\@ocg@ocgs\space]%
+ }%
+ \immediate\pdfobj useobjnum \@ocg@@layersconfig {%
+ <<
+ /Order [\@ocg@ocgs\space]
+ /ON [\@ocg@ocgson\space]
+ /OFF [\@ocg@ocgsoff\space]
+ >>%
+ }%
+}%
+
+% schedule a OCG for creation on the next pdflatex run (via the auxfile)
+\def\@ocg@newocg#1#2#3{% #1:name, #2:num, #3:on
+ \if@filesw%
+ \immediate\write\@auxout{%
+ \string\@ocg@makeknown{#1}{#2}{#3}%
+ }%
+ \fi%
+}
+
+% TODO: Are nested OCGs allowed?
+\newenvironment{ocg}[3]{%
+ \@ocg@newocg{#1}{#2}{#3}%
+ \gdef\@ocg@curnum{#2}%
+ \pdfliteral{/OC /OC\@ocg@curnum\space BDC}%
+ \message{/OC\@ocg@curnum}%
+ \ignorespaces
+}{%
+ \pdfliteral{EMC}%
+ %\unskip%
+ %\endgroup%
+ \ignorespacesafterend
+}