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%D \module
%D [ file=colo-ext, % mostof thsi code used to be in colo-ini.tex
%D version=1997.04.01,
%D title=\CONTEXT\ Color Macros,
%D subtitle=Extras,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright={PRAGMA ADE \& \CONTEXT\ Development Team}]
%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 Color Macros / Extras}
\unprotect
%D \macros
%D {negatecolorcomponent, negativecolorbox}
%D
%D Sometimes, especially when we deal with typesetting
%D devices, we want to reverse the color scheme. Instead of
%D recalculating all those colors, we use a quick and dirty
%D approach:
%D
%D \starttyping
%D \negativecolorbox0
%D \stoptyping
%D
%D will negate the colors in box zero.
% \unexpanded\def\negatecolorbox#1%
% {\setbox#1\hbox
% {\startnegative % might change
% \startcolor[\s!white]\vrule\!!height\ht#1\!!depth\dp#1\!!width\wd#1\stopcolor
% \hskip-\wd#1%
% \box#1%
% \stopnegative}}
\unexpanded\def\negatecolorbox#1%
{\setbox#1\hbox
{\startnegative % might change
% \startcolor[\s!white]\vrule\!!height\ht#1\!!depth\dp#1\!!width\wd#1\stopcolor
\blackrule[\c!color=\s!white,\c!height=\ht#1,\c!depth=\dp#1,\c!width=\wd#1]%
\hskip-\wd#1%
\box#1%
\stopnegative}}
%D There are in principle two ways to handle overprint: bound to colors
%D or independent. For the moment we only support independent overprint
%D handling. Here we deal with a per-document setting.
%D We can move the stack and attribute setting to the \LUA\ end.
\installcorenamespace{colorintent}
\unexpanded\def\registercolorintent#1#2%
{\setevalue{\??colorintent#1}{\attribute\colorintentattribute\ctxcommand{registercolorintent('#2')} }}
\unexpanded\def\colo_intents_set
{\ctxcommand{enablecolorintents()}%
\unexpanded\gdef\colo_intents_set##1{\csname\??colorintent##1\endcsname}%
\colo_intents_set}
\registercolorintent{knockout} {knockout}
\registercolorintent{overprint}{overprint}
\installattributestack\colorintentattribute
\setevalue{\??colorintent\v!none}{\attribute\colorintentattribute\attributeunsetvalue} % or reset? used at all?
\unexpanded\def\startcolorintent[#1]%
{\pushattribute\colorintentattribute
\colo_intents_set{#1}}
\unexpanded\def\stopcolorintent
{\popattribute\colorintentattribute}
\unexpanded\def\startoverprint{\startcolorintent[\v!overprint]}
\unexpanded\def\startknockout {\startcolorintent[\v!knockout ]}
\let\stopoverprint\stopcolorintent
\let\stopknockout \stopcolorintent
\let\starttextcolorintent\relax
\let\stoptextcolorintent \relax
\appendtoks
\colo_intents_set_text
\to \everysetupcolors
\let\p_colo_intent\empty
\def\colo_intents_set_text
{\edef\p_colo_intent{\colorsparameter\c!intent}%
\ifx\p_colo_intent\v!none \else
\unexpanded\xdef\starttextcolorintent{\colo_intents_set{\p_colo_intent}}%
\glet\colo_intents_set_text\relax
\colo_intents_set\p_colo_intent
\fi}
\appendtoks \starttextcolorintent \to \everystarttextproperties
\appendtoks \stoptextcolorintent \to \everystoptextproperties
\setupcolors
[\c!intent=\v!none]
\protect \endinput
|
