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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 devices, we want to reverse
%D the color scheme. Instead of recalculating all those colors, we use a quick and
%D dirty approach:
%D
%D \starttyping
%D \negativecolorbox0
%D \stoptyping
%D
%D will negate the colors in box zero.
\permanent\protected\def\negatecolorbox#1% or just set attr of #1
{\setbox#1\hpack to \wd#1%
{\scratchdimen\wd#1\relax
\startnegative % might change
\blackrule[\c!color=\s!white,\c!height=\ht#1,\c!depth=\dp#1,\c!width=\scratchdimen]%
\hskip-\scratchdimen
\leaders\box#1\hfill% this triggers application to the box .. a real dirty hack!
\stopnegative}}
%D There are in principle two ways to handle overprint: bound to colors or
%D independent. For the moment we only support independent overprint handling. Here
%D we deal with a per-document setting.
%D We can move the stack and attribute setting to the \LUA\ end.
\installcorenamespace{colorintent}
\permanent\protected\def\registercolorintent#1#2% \relax is needed !
{\setevalue{\??colorintent#1}{\c_attr_colorintent\clf_registercolorintent{#2}\relax}}
\protected\def\colo_intents_set
{\clf_enablecolorintents
\protected\gdef\colo_intents_set##1{\csname\??colorintent##1\endcsname}%
\colo_intents_set}
\registercolorintent{knockout} {knockout}
\registercolorintent{overprint}{overprint}
\installattributestack\colorintentattribute
\edefcsname\??colorintent\v!none\endcsname{\c_attr_colorintent\attributeunsetvalue} % or reset? used at all?
\permanent\protected\def\startcolorintent[#1]%
{\pushattribute\colorintentattribute
\colo_intents_set{#1}}
\permanent\protected\def\stopcolorintent
{\popattribute\colorintentattribute}
\permanent\protected\def\startoverprint{\startcolorintent[\v!overprint]}
\permanent\protected\def\startknockout {\startcolorintent[\v!knockout ]}
\aliased\let\stopoverprint\stopcolorintent
\aliased\let\stopknockout \stopcolorintent
\permanent\protected\lettonothing\starttextcolorintent
\permanent\protected\lettonothing\stoptextcolorintent
\appendtoks
\colo_intents_set_text
\to \everysetupcolors
\lettonothing\p_colo_intent
\def\colo_intents_set_text
{\edef\p_colo_intent{\colorsparameter\c!intent}%
\ifx\p_colo_intent\v!none \else
\enforced\protected\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
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