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% Copyright (C) 1990, 1996, 1997 Aladdin Enterprises. All rights reserved.
%
% This file is part of Aladdin Ghostscript.
%
% Aladdin Ghostscript is distributed with NO WARRANTY OF ANY KIND. No author
% or distributor accepts any responsibility for the consequences of using it,
% or for whether it serves any particular purpose or works at all, unless he
% or she says so in writing. Refer to the Aladdin Ghostscript Free Public
% License (the "License") for full details.
%
% Every copy of Aladdin Ghostscript must include a copy of the License,
% normally in a plain ASCII text file named PUBLIC. The License grants you
% the right to copy, modify and redistribute Aladdin Ghostscript, but only
% under certain conditions described in the License. Among other things, the
% License requires that the copyright notice and this notice be preserved on
% all copies.
% Initialization file for basic Display PostScript functions
% that are also included in Level 2.
level2dict begin
% ------ Halftones ------ %
/.makestackdict
{ { counttomark -1 roll } forall .dicttomark
} bind def
/currenthalftone % - currenthalftone <dict>
{ mark .currenthalftone
{ { exch pop } % halftone
{ /HalftoneType 1 % screen
{ /Frequency /Angle /SpotFunction }
.makestackdict
}
{ /HalftoneType 2 % colorscreen
{ /RedFrequency /RedAngle /RedSpotFunction
/GreenFrequency /GreenAngle /GreenSpotFunction
/BlueFrequency /BlueAngle /BlueSpotFunction
/GrayFrequency /GrayAngle /GraySpotFunction
}
.makestackdict
}
}
exch get exec
} odef
% Define sethalftone so it converts all other types to type 5.
/.sethalftoneRGBV % <dict> <type> <keys> <keysRGBV>
{ 4 -1 roll exch { 1 index exch get exch } forall 15 1 roll
14 -2 roll mark 15 1 roll { /Gray /Blue /Green /Red }
{ % stack: v0 v1 v2 type keys comp
mark
2 index 0 get 8 -1 roll
4 index 1 get 9 -1 roll
6 index 2 get 10 -1 roll
% stack: type keys comp mark k0 v0 k1 v1 k2 v2
/HalftoneType 10 index .dicttomark
counttomark 2 roll
}
forall pop pop
/Default 1 index .dicttomark .sethalftone5
} bind def
/sethalftone { % <dict> sethalftone -
% We must create the new dictionary in the same VM as the
% operand; otherwise, invalidaccess errors may occur.
.currentglobal 1 index dup gcheck .setglobal
dup /HalftoneType get 1 sub {
{ mark /Default 2 index .dicttomark .sethalftone5
}
{ 1 { /Frequency /Angle /SpotFunction }
{ /RedFrequency /RedAngle /RedSpotFunction
/GreenFrequency /GreenAngle /GreenSpotFunction
/BlueFrequency /BlueAngle /BlueSpotFunction
/GrayFrequency /GrayAngle /GraySpotFunction
} .sethalftoneRGBV
}
{ mark /Default 2 index .dicttomark .sethalftone5
}
{ 3 { /Width /Height /Thresholds }
{ /RedWidth /RedHeight /RedThresholds
/GreenWidth /GreenHeight /GreenThresholds
/BlueWidth /BlueHeight /BlueThresholds
/GrayWidth /GrayHeight /GrayThresholds
} .sethalftoneRGBV
}
{ dup .sethalftone5
}
} exch get exec .setglobal pop
} odef
% Redefine setscreen and setcolorscreen to recognize halftone dictionaries,
% and to insert the Frequency and Angle into Type 1 halftones, per
% Adobe TN 5085.
/.fixsethalftonescreen % <freq> <angle> <dict> .fix...screen
% <freq> <angle> <dict> <dict'>
{ dup dup /HalftoneType get 1 eq
{ dup wcheck not { dup length .copydict } if
dup /Frequency 5 index put
dup /Angle 4 index put
}
if
} bind def
/setscreen % <ignore*2> <dict> setscreen -
{ dup type /dicttype eq
{ .fixsethalftonescreen sethalftone pop pop pop }
{ //setscreen }
ifelse
} odef
/setcolorscreen % <ignore*11> <dict> setcolorscreen -
{ dup type /dicttype eq
{ .fixsethalftonescreen sethalftone 12 { pop } repeat }
{ //setcolorscreen }
ifelse
} odef
% Redefine currentscreen and currentcolorscreen to extract the Frequency
% and Angle from Type 1 halftones, per Adobe TN 5085.
/.fixcurrenthalftonescreen % <dict> .fix... <freq> <angle> <proc>
{ dup /HalftoneType get 1 eq
{ dup /Frequency get 1 index /Angle get }
{ 60 0 }
ifelse 3 2 roll
} bind def
/currentscreen % - currentscreen 60 0 <dict>
{ .currenthalftone
{ { .fixcurrenthalftonescreen } % halftone
{ } % screen
{ 12 3 roll 9 { pop } repeat % colorscreen
dup type /dicttype eq { .fixcurrenthalftonescreen } if
}
}
exch get exec
} odef
/currentcolorscreen % - currentcolorscreen (60 0 <dict>)*4
{ .currenthalftone
{ { .fixcurrenthalftonescreen 3 copy 6 copy } % halftone
{ 3 copy 6 copy } % screen
{ } % colorscreen
}
exch get exec
} odef
% ------ User objects ------ %
/.localarray where {
pop
} {
/.localarray {
currentglobal false setglobal
exch array exch setglobal
} bind def
} ifelse
% The name UserObjects may be rebound, but we need to make sure these
% operators always refer to the binding in userdict (which may also be
% rebound!).
/.UserObjects {
//systemdict /userdict get /UserObjects
} odef
% In order to get proper error recovery behavior, we need to be careful
% not to pop any operands from the stack until we're done.
% The code below faithfully duplicates the apparent array-growing
% behavior of Adobe interpreters.
/defineuserobject { % <index> <value> defineuserobject -
.UserObjects .knownget {
length dup 3 index le {
% Stack: index value len
2 index eq { 1 index 2 mul } { 1 index 1 add } ifelse
.localarray userdict /UserObjects get
1 index copy pop
.UserObjects 3 -1 roll put
} {
pop
} ifelse
} {
.UserObjects 3 index 1 add 10 .max .localarray put
} ifelse
.UserObjects get 2 index 2 index put pop pop
} odef
/execuserobject { % <index> execuserobject -
.UserObjects get 1 index get exch pop exec
} odef
/undefineuserobject { % <index> undefineuserobject -
.UserObjects get 1 index null put pop
} odef
% ------ User paths ------ %
/upath { % <bool> upath <array>
[ 1 index {/ucache cvx} if
true .pathbbox /setbbox cvx
{/moveto cvx} {/lineto cvx} {/curveto cvx} {/closepath cvx}
pathforall ] cvx exch pop
} odef
% Dummy definitions for cache control operators
/ucachestatus { % - ucachestatus -mark- ? ? ? ? <size>
mark 0 0 0 0 userdict /.ucachesize .knownget not { 0 } if
} odef
/setucacheparams { % -mark- ... <size> setucacheparams -
% Provoke an appropriate error if needed.
counttomark 1 lt { () 0 get } if
0 or userdict /.ucachesize 2 index 0 .max put cleartomark
} odef
end % level2dict
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