wrong mlib process calls

[Peter Rolf <indiego@gmx.net>]

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Hi,

I have added the 'mtr' process in front of the normal 'tr'
process.

[mlib-pps.lua]
...
appendaction(processoractions,"system",fg_process)
appendaction(processoractions,"system",mtr_process)
appendaction(processoractions,"system",tr_process) -- last, as color can
be reset
...

Strangely the 'mtr' process is also(!) called, if normal transparency
('tr') or text ('tx') is used. You can imagine that the 'cleanup
code' has unwanted side effects here. :-)
A change of the 'appendaction' order has no impact.

I simply added

    commands.writestatus('mtr_process',table.serialize(prescript))

at the start of mtr_process and this is what I get for the attached example:

mtr_process     > t={
 { "tr_transparency", "0.5" },
 { "tr_alternative", "1" },
 ["tr_alternative"]="1",
 ["tr_transparency"]="0.5",
}
mtr_process     > t={
 { "tr_transparency", "0.5" },
 { "tr_alternative", "1" },
 ["tr_alternative"]="1",
 ["tr_transparency"]="0.5",
}
mtr_process     > t={
 { "tx_stage", "final" },
 { "tx_number", "1" },
 ["tx_number"]="1",
 ["tx_stage"]="final",
}

Any ideas what goes wrong here? Example and patched file added.


Peter


mtx-context     | current version: 2011.08.04 00:42
This is LuaTeX, Version beta-0.70.1-2011051907 (rev 4277)

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\nopdfcompression
\setuppagenumber[state=stop]


\definecolor[foo][r=1,g=0,b=0,,a=1,t=.5]
%\definecolor[foo][r=1,g=0,b=0]

\startuniqueMPgraphic{foo}{color}
    rgbcolor c;
    % this only works with non transparent colors; otherwise...
%    c:= \MPvar{color}; % ...:  ! Equation cannot be performed (color=numeric).
    % works with non|transparent colors, but grayscale conversion!!
    c:= \MPcolor{\MPvar{color}};

    fill OverlayBox scaled .25 withcolor c;
    fill OverlayBox scaled .50 withcolor transparent(normaltransparent,.5,c);
    fill OverlayBox scaled 1.0 withcolor c withtransparency(normaltransparent,.5);

    label(decimal(redpart c) & "," & decimal(greenpart c) & "," & decimal(bluepart c),center(OverlayBox));
\stopuniqueMPgraphic

\defineoverlay[foo][\uniqueMPgraphic{foo}{color=foo}]

\starttext

\framed[width=10cm,height=2cm,frame=on,background=foo]{}

\stoptext

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