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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.
\def\negatecolorbox#1%
{\setbox#1\hbox
{\dostartnegative
\localstartcolor[white]\vrule\!!height\ht#1\!!depth\dp#1\!!width\wd#1\localstopcolor
\hskip-\wd#1%
\box#1%
\dostopnegative}}
%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.
\setupcolors
[\c!intent=\v!none]
\def\starttextoverprint
{\doifelse\@@clintent\v!overprint
{\glet\stoptextoverprint \dostopoverprint
\glet\starttextoverprint\dostartoverprint
\dostartoverprint}
{\glet\stoptextoverprint\donothing}}
\let\stoptextoverprint\donothing
\appendtoks \starttextoverprint \to \everystarttextproperties
\appendtoks \stoptextoverprint \to \everystoptextproperties
\protect \endinput
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