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% Copyright (C) 1990, 1996, 1997, 1998, 2000 Aladdin Enterprises. All rights reserved.
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%
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% This software is provided AS-IS with no warranty, either express or
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% implied.
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%
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% This software is distributed under license and may not be copied,
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% modified or distributed except as expressly authorized under the terms
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% of the license contained in the file LICENSE in this distribution.
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%
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% For more information about licensing, please refer to
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% http://www.ghostscript.com/licensing/. For information on
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% commercial licensing, go to http://www.artifex.com/licensing/ or
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% contact Artifex Software, Inc., 101 Lucas Valley Road #110,
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% San Rafael, CA 94903, U.S.A., +1(415)492-9861.
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% $Id: gs_dps2.ps,v 1.5 2002/02/21 21:49:28 giles Exp $
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% Initialization file for basic Display PostScript functions
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% that are also included in Level 2.
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level2dict begin
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% ------ Halftones ------ %
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/.makestackdict
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{ { counttomark -1 roll } forall .dicttomark
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} bind def
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/currenthalftone % - currenthalftone <dict>
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{ mark .currenthalftone
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{ { exch pop } % halftone
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{ /HalftoneType 1 % screen
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{ /Frequency /Angle /SpotFunction }
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.makestackdict
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}
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{ /HalftoneType 2 % colorscreen
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{ /RedFrequency /RedAngle /RedSpotFunction
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/GreenFrequency /GreenAngle /GreenSpotFunction
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/BlueFrequency /BlueAngle /BlueSpotFunction
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/GrayFrequency /GrayAngle /GraySpotFunction
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}
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.makestackdict
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}
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}
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exch get exec
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} odef
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% Define sethalftone so it converts types 1-4 to type 5.
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/.makehalftoneRGBV { % <dict> <type> <keys> <keysRGBV>
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4 -1 roll exch { 1 index exch get exch } forall 15 1 roll
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14 -2 roll mark 15 1 roll { /Gray /Blue /Green /Red } {
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% stack: v0 v1 v2 type keys comp
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mark
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2 index 0 get 8 -1 roll
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4 index 1 get 9 -1 roll
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6 index 2 get 10 -1 roll
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% stack: type keys comp mark k0 v0 k1 v1 k2 v2
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/HalftoneType 10 index .dicttomark
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counttomark 2 roll
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} forall pop pop
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/Default 1 index .dicttomark exch pop { .sethalftone5 }
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} bind def
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% The value of each entry in .halftonetypes is a procedure:
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% <setdict> <htdict> <<proc>> <setdict'> <htdict'> <sethalftoneproc>
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% This allows us to use these procedures both for actually implementing
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% sethalftone and for converting subsidiary dictionaries of HalftoneType 5
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% halftones.
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systemdict begin
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15 dict /.halftonetypes 1 index def begin
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1 {
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mark exch /Default exch .dicttomark { .sethalftone5 }
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} bind def
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2 {
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1 { /Frequency /Angle /SpotFunction } {
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/RedFrequency /RedAngle /RedSpotFunction
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/GreenFrequency /GreenAngle /GreenSpotFunction
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/BlueFrequency /BlueAngle /BlueSpotFunction
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/GrayFrequency /GrayAngle /GraySpotFunction
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} .makehalftoneRGBV
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} bind def
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3 {
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mark exch /Default exch .dicttomark { .sethalftone5 }
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} bind def
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4 {
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3 { /Width /Height /Thresholds } {
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/RedWidth /RedHeight /RedThresholds
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/GreenWidth /GreenHeight /GreenThresholds
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/BlueWidth /BlueHeight /BlueThresholds
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/GrayWidth /GrayHeight /GrayThresholds
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} .makehalftoneRGBV
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} bind def
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5 {
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pop dup length dict copy
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mark 1 index {
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% Even HalftoneType 5 dictionaries have entries other than
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% subsidiary halftone dictionaries.
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dup type /dicttype ne {
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} {
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dup /HalftoneType .knownget not { 0 } if
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} ifelse dup 5 gt {
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% Stack: dict mark ... keyN dictN httypeN
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% Assume that all HalftoneTypes > 5 convert to 5.
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1 index 3 1 roll
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//.halftonetypes exch get exec pop /Default get
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% Stack: dict mark ... keyN setdict'N htdict'N
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counttomark 1 add index 3 index 4 -1 roll put
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} {
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pop
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} ifelse
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} forall .dicttomark { .sethalftone5 }
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} bind def
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end
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end
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/sethalftone { % <dict> sethalftone -
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% We must create the new dictionary in the same VM as the
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% operand; otherwise, invalidaccess errors may occur.
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.currentglobal 1 index dup gcheck .setglobal
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dup //.halftonetypes 1 index /HalftoneType get get exec exec
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.setglobal pop
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} odef
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% Redefine setscreen and setcolorscreen to recognize halftone dictionaries,
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% and to insert the Frequency and Angle into Type 1 halftones, per
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% Adobe TN 5085.
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/.fixsethalftonescreen % <freq> <angle> <dict> .fix...screen
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% <freq> <angle> <dict> <dict'>
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{ dup dup /HalftoneType get 1 eq
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{ dup wcheck not { dup length .copydict } if
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dup /Frequency 5 index put
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dup /Angle 4 index put
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}
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if
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} bind def
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/setscreen % <ignore*2> <dict> setscreen -
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{ dup type /dicttype eq
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{ .fixsethalftonescreen sethalftone pop pop pop }
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{ //setscreen }
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ifelse
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} odef
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/setcolorscreen % <ignore*11> <dict> setcolorscreen -
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{ dup type /dicttype eq
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{ .fixsethalftonescreen sethalftone 12 { pop } repeat }
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{ //setcolorscreen }
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ifelse
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} odef
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% Redefine currentscreen and currentcolorscreen to extract the Frequency
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% and Angle from Type 1 halftones, per Adobe TN 5085.
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/.fixcurrenthalftonescreen % <dict> .fix... <freq> <angle> <proc>
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{ dup /HalftoneType get 1 eq
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{ dup /Frequency get 1 index /Angle get }
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{ 60 0 }
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ifelse 3 2 roll
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} bind def
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/currentscreen % - currentscreen 60 0 <dict>
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{ .currenthalftone
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{ { .fixcurrenthalftonescreen } % halftone
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{ } % screen
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{ 12 3 roll 9 { pop } repeat % colorscreen
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dup type /dicttype eq { .fixcurrenthalftonescreen } if
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}
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}
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exch get exec
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} odef
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/currentcolorscreen % - currentcolorscreen (60 0 <dict>)*4
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{ .currenthalftone
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{ { .fixcurrenthalftonescreen 3 copy 6 copy } % halftone
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{ 3 copy 6 copy } % screen
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{ } % colorscreen
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}
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exch get exec
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} odef
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% ------ User objects ------ %
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/.UserObjects {
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.userdict /UserObjects
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} odef
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% In order to get proper error recovery behavior, we need to be careful
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% not to pop any operands from the stack until we're done.
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% The code below faithfully duplicates the apparent array-growing
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% behavior of Adobe interpreters.
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/defineuserobject { % <index> <value> defineuserobject -
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.UserObjects .knownget {
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length dup 3 index le {
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% Stack: index value len
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2 index eq { 1 index 2 mul } { 1 index 1 add } ifelse
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.localvmarray .UserObjects get
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1 index copy pop
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.UserObjects 3 -1 roll put
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} {
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pop
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} ifelse
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} {
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.UserObjects 3 index 1 add 10 .max .localvmarray put
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} ifelse
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.UserObjects get 2 index 2 index put pop pop
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} odef
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/execuserobject { % <index> execuserobject -
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.UserObjects get 1 index get exch pop exec
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} odef
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/undefineuserobject { % <index> undefineuserobject -
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.UserObjects get 1 index null put pop
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} odef
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% ------ Cache control ------ %
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% Dummy definitions for cache control operators
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/ucachestatus { % - ucachestatus -mark- ? ? ? ? <size>
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mark 0 0 0 0 .userdict /.ucachesize .knownget not { 0 } if
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} odef
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/setucacheparams { % -mark- ... <size> setucacheparams -
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% Provoke an appropriate error if needed.
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counttomark 1 lt { () 0 get } if
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} odef
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end % level2dict
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