--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/talks/20091108-Riverside/xypdf-c.tex	Fri Oct 30 21:05:16 2009 +0000
@@ -0,0 +1,86 @@
+%% xypdf-c.tex from $Id: xypdf-c.doc,v $
+%%
+%% Xy-pic ``Colour extension'' PDF backend support.
+%% Copyright (c) 1999-1999 Ross Moore <ross@mpce.mq.edu.au>
+%%
+%% This file is part of the Xy-pic package for graphs and diagrams in TeX.
+%% See the companion README and INSTALL files for further information.
+%% Copyright (c) 1991-1999 Kristoffer H. Rose <krisrose@brics.dk>
+%%
+%% The Xy-pic package is free software; you can redistribute it and/or modify
+%% it under the terms of the GNU General Public License as published by the
+%% Free Software Foundation; either version 2 of the License, or (at your
+%% option) any later version.
+%%
+%% The Xy-pic package is distributed in the hope that it will be useful, but
+%% WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+%% or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
+%% for more details.
+%%
+%% You should have received a copy of the GNU General Public License along
+%% with this package; if not, write to the Free Software Foundation, Inc.,
+%% 675 Mass Ave, Cambridge, MA 02139, USA.
+%%
+%% As a special exception, you may use this file and all files derived
+%% from it without restrictions. This special exception was added with
+%% version 3.7 of Xy-pic.
+%%
+\expandafter\ifx\csname xypdf-cloaded\endcsname\empty
+ \message{not reloaded}\endinput \fi
+\expandafter\let\csname xypdf-cloaded\endcsname=\empty \xycatcodes
+\expandafter\ifx \csname xypdf-sloaded\endcsname\empty\else
+ \xyinputorelse@{xypdf-s}{\xyerror@{Could not load xypdf-s}{}}%
+ \xycatcodes\fi
+\xydef@\UsePDFcolor{\installPDFcolor@}
+\xydef@\NoPDFcolor{\UnloadColor@}
+\xydef@\installPDFcolor@{\installPDFstyle@
+ \let\xymath@=\xyPDFmath@ \let\xynomath@=\xyPDFnomath@
+ \let\checkxyPDFcolor@=\checkxyPDFcolor@@
+ \let\xycolor@@=\xyPDFcolor@@
+ \xystandardcolors@ 
+ \xyuncatcodes }
+\xydef@\xyPDFmath@{\hbox\bgroup\dimen@=.55ex \checkxyPDFcolor@ \xyinside@}
+\xydef@\xyPDFnomath@{\hbox\bgroup\dimen@=\z@ \checkxyPDFcolor@ \xyinside@}
+\xydef@\checkxyPDFcolor@@{\edef\pdfsaved@color{\pdfcurrent@color}%
+ \let\checkxyPDFcolor@=\relax}
+\xylet@\checkxyPDFcolor@=\relax
+\xydef@\xyPDFnewcolor@#1#2#3#4#5{%
+ \expandafter\DN@\expandafter{\csname shape [#1]\endcsname}%
+ \DNii@{\relax}\ifx\next@\nextii@\newxycolor{#1}{}\relax\fi
+ \DNii@{#4}\ifx\nextii@\empty
+ \expandafter\DNii@\expandafter{\csname xyPDFshape@#1@\endcsname}%
+ \expandafter\def\nextii@{\xyPDFcolor@{#2//#3}}\else
+ \expandafter\DNii@\expandafter{\csname xyPDFshape@#1@\endcsname}%
+ \expandafter\def\nextii@{\xyPDFcolor@{#4}}\fi
+ \ifx\nextii@\empty\expandafter\def\next@{\xyPDFnotimplemented@@`#1'@@}%
+ \else
+ \edef\tmp@{\noexpand\let\expandafter\noexpand\next@
+ \expandafter\noexpand\nextii@}\expandafter\tmp@\fi }
+\xylet@\newxycolor@=\xyPDFnewcolor@
+\xydef@\xyPDFcolor@{\ifPDFspecials@\expandafter\xyPDFcolor@@
+ \else\expandafter\eat@\fi}
+\xydef@\xyPDFcolor@@#1{\bgroup \checkXyStyle@ 
+ \def\preStyle@@{\expandafter\addtostyletoks@\expandafter{\xyPDFpre@}}%
+ \def\postStyle@@{\expandafter\addtostyletoks@\expandafter{\xyPDFpost@}}%
+ \let\modPDFboxz@=\modXYstyle@ \xyPDF@color@@{#1}%
+ \toks@={\egroup\let\xy@style@=\relax \def\Drop@@}%
+ \expandafter\addtotoks@\expandafter{\expandafter{\Drop@@}\def\Connect@@}%
+ \expandafter\addtotoks@\expandafter{\expandafter{\Connect@@}}%
+ \the\toks@ }
+
+\xydef@\pdfcurrent@color{1 1 1 1 k 1 1 1 1 K}
+\xydef@\pdfsaved@color{1 1 1 1 k 1 1 1 1 K}
+\xydef@\xyPDF@color@@#1{%
+ \edef\pdfsaved@color{\pdfcurrent@color}%
+ \pdf@convertcolor#1////!%
+ \edef\next@{\noexpand\xyPDFsplitPDF@{\pdfcurrent@color}{\pdfsaved@color}}%
+ \next@}
+\xydef@\pdf@convertcolor#1//#2//#3!{\DN@{#2}%
+ \DNii@{cmyk}\ifx\next@\nextii@\DN@{#1 k #1 K}%
+ \else \DNii@{rgb}\ifx\next@\nextii@\DN@{#1 rg #1 RG}%
+ \else \DNii@{gray}\ifx\next@\nextii@\DN@{#1 #1 #1 rg #1 #1 #1 RG}%
+ \else \DN@{1 1 1 1 k 1 1 1 1 K}%
+ \fi \fi \fi 
+ \expandafter\def\expandafter\pdfcurrent@color\expandafter{\next@}}
+\xydef@\xycolor@raw@@#1{}%
+\endinput