ref: 5f7a6b7ea3c4ae1b51beffe3309e9b6b0491e71f
dir: /sys/src/cmd/gs/lib/gs_trap.ps/
% Copyright (C) 1999, 2000 Aladdin Enterprises. All rights reserved.
%
% This software is provided AS-IS with no warranty, either express or
% implied.
%
% This software is distributed under license and may not be copied,
% modified or distributed except as expressly authorized under the terms
% of the license contained in the file LICENSE in this distribution.
%
% For more information about licensing, please refer to
% http://www.ghostscript.com/licensing/. For information on
% commercial licensing, go to http://www.artifex.com/licensing/ or
% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
% $Id: gs_trap.ps,v 1.6 2002/06/02 12:03:28 mpsuzuki Exp $
% PostScript LanguageLevel 3 in-RIP trapping support.
ll3dict begin
% We need LanguageLevel 2 or higher in order to have setuserparams and
% defineresource.
languagelevel dup 2 .max .setlanguagelevel
% ------ Trapping ------ %
% The PostScript-level trapping parameters are maintained in userdict,
% and explicitly reinstalled upon restore.
/Trapping mark
/settrapparams dup { % <paramdict> settrapparams -
/.trapparams .uservar dup length dict .copydict
dup 2 index {
% Stack: paramdict olddict olddict key value
2 index 2 index known { put dup } { pop pop } ifelse
} forall pop
dup .settrapparams % Let the operator check parameter validity.
.userdict /.trapparams 3 -1 roll put pop
} bind .makeoperator
/.copyparams { % <obj> .copyparams <obj'>
dup type /dicttype eq {
dup length dict .copydict
dup {
.copyparams 3 copy put pop pop
} forall
} {
dup type /arraytype eq {
[ exch { .copyparams } forall ]
} if
} ifelse
} odef
/currenttrapparams dup { % - currenttrapparams <paramdict>
/.trapparams .uservar .copyparams
} bind .makeoperator
/settrapzone dup { % - settrapzone -
% ****** DUMMY ******
newpath
} bind .makeoperator
% Define initial (dummy) trapping parameters.
% These values are mostly complete guesses.
userdict /.trapparams mark
/BlackColorLimit 1.0
/BlackDensityLimit 1.0
/BlackWidth 1.0
/ColorantZoneDetails 0 dict
/Enabled true
/HalftoneName null
/ImageInternalTrapping false
/ImagemaskTrapping true
/ImageResolution 1
/ImageToObjectTrapping true
/ImageTrapPlacement /Center
/SlidingTrapLimit 1.0
/StepLimit 1.0
/TrapColorScaling 0.0
/TrapSetName null
/TrapWidth 1.0
.dicttomark readonly put
.dicttomark /ProcSet defineresource pop
% Define the InkParams and TrapParams resource categories.
{ /InkParams /TrapParams } {
/Generic /Category findresource dup maxlength 3 add dict .copydict begin
/InstanceType /dicttype def
currentdict end /Category defineresource pop
} forall
% Define the TrappingType resource category.
/Generic /Category findresource dup maxlength 3 add dict .copydict begin
/InstanceType /integertype def
/TrappingType currentdict end /Category defineresource pop
{1001} { dup /TrappingType defineresource pop } forall
.setlanguagelevel
end % ll3dict