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%D \module
%D [ file=attr-col,
%D version=2007.06.06,
%D title=\CONTEXT\ Attribute Macros,
%D subtitle=Color,
%D author=Hans Hagen,
%D date=\currentdate,
%D copyright=PRAGMA-ADE]
%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 Attribute Macros / Color}
\registerctxluafile{attr-col}{1.001}
\unprotect
% todo: no need for 'color' argument, we can set that once at startup; currently
% a bit inconsistent
% 1=off 2=gray 3=spot 4=rgb 5=cmyk 6=cmy % only 1/2/4/5 are supported
%
% We could combine this in one attribute but this is not faster and also
% less flexible because sometimes we want to freeze the attribute bit.
% % color (layer on top)
%
% \def\dosetcolormodel#1% overloaded later
% {\ctxcommand{setcolormodel('#1')}} % sets attribute
%
% \dosetcolormodel{all}
%
% \def\registerrgbcolor#1#2#3#4% not used
% {\setevalue{(cs:#1)}{\attribute\colorattribute\ctxcommand{registercolor('#1','rgb' ,#2,#3,#4)}}}
%
% \def\registercmykcolor#1#2#3#4#5% not used
% {\setevalue{(cs:#1)}{\attribute\colorattribute\ctxcommand{registercolor('#1','cmyk',#2,#3,#4,#5)}}}
%
% \def\registergraycolor#1#2% not used
% {\setevalue{(cs:#1)}{\attribute\colorattribute\ctxcommand{registercolor('#1','gray',#2)}}}
% % transparency (layer on top)
%
% \def\registertransparency#1#2#3%
% {\setevalue{(ts:#1)}{\attribute\transparencyattribute\ctxcommand{registertransparency(#2,#3)} }}
%
% \def\sometransparencyswitch#1%
% {\csname(ts:#1)\endcsname}
%
% \def\sometransparencyswitch
% {\ctxcommand{enabletransparency()}%
% \gdef\sometransparencyswitch##1{\csname(ts:##1)\endcsname}%
% \sometransparencyswitch}
%
% \registertransparency {one} {1} {.5}
% \registertransparency {two} {1} {.6}
% overprint
\def\registercolorintent#1#2%
{\setevalue{(os:#1)}{\attribute\colorintentattribute\ctxcommand{registercolorintent('#2')} }}
\def\dotriggercolorintent
{\ctxcommand{enablecolorintents()}%
\gdef\dotriggercolorintent##1{\csname(os:##1)\endcsname}%
\dotriggercolorintent}
\registercolorintent{knockout} {knockout}
\registercolorintent{overprint}{overprint}
\installattributestack\colorintentattribute
\setevalue{(os:#\v!none}{\attribute\colorintentattribute\attributeunsetvalue} % does this work out ok?
\protect \endinput
% test case
%
% {\green \hbox to \hsize{\leaders\hrule \hfill a}\par}
% {\red \hbox to \hsize{\leaders\hbox{x}\hfill a}\par}
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