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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.
%
% Watch out: real color support will be implemented later.
\newcount\currentcolormodel
\def\dosetcolormodel#1%
{\currentcolormodel\ctxlua{tex.print(_clib_.setmodel('#1'))}%
\attribute\colormodelattribute\currentcolormodel}
\dosetcolormodel{all}
\appendtoks
\dosetcolormodel{all}% redundant?
\to \everyjob
\def\registerrgbcolor #1#2#3#4{\ctxlua{_clib_.register('#1','rgb' ,#2,#3,#4)}}
\def\registercmykcolor#1#2#3#4#5{\ctxlua{_clib_.register('#1','cmyk',#2,#3,#4,#5)}}
\def\registergraycolor #1#2{\ctxlua{_clib_.register('#1','gray',#2)}}
% transparency
\def\registertransparency#1#2#3%
{\setevalue{(ts:#1)}{\attribute\transparencyattribute\ctxlua{tex.write(_tlib_.register(#2,#3))} }}
\def\sometransparencyswitch#1{\csname(ts:#1)\endcsname}
\def\sometransparencyswitch
{\ctxlua{_tlib_.enable()}%
\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\ctxlua{tex.write(attributes.colorintents.register('#2'))} }}
\def\dotriggercolorintent
{\ctxlua{attributes.colorintents.enable()}%
\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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