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-% Copyright (C) 1990, 1996, 1997, 1998, 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_dps2.ps 8111 2007-07-06 16:42:18Z alexcher $
-% Initialization file for basic Display PostScript functions
-% that are also included in Level 2.
-
-level2dict begin
-
-% ------ Errors ------ %
-
-% These errors are only defined in Level 2 and DPS.
-{ /configurationerror /undefinedresource /unregistered }
-{ .registererror } forall
-
-% ------ Halftones ------ %
-
-/.makestackdict
- { { counttomark -1 roll } forall .dicttomark
- } bind def
-/currenthalftone % - currenthalftone <dict>
- { mark .currenthalftone
- { { exch pop } % halftone
- { /HalftoneType 1 % screen
- { /Frequency /Angle /SpotFunction }
- .makestackdict readonly
- }
- { /HalftoneType 2 % colorscreen
- { /RedFrequency /RedAngle /RedSpotFunction
- /GreenFrequency /GreenAngle /GreenSpotFunction
- /BlueFrequency /BlueAngle /BlueSpotFunction
- /GrayFrequency /GrayAngle /GraySpotFunction
- }
- .makestackdict readonly
- }
- }
- exch get exec
- } odef
-% Define sethalftone so it converts types 1-4 to type 5.
-/.makehalftoneRGBV { % <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 exch pop { .sethalftone5 }
-} bind def
-
-% The value of each entry in .halftonetypes is a procedure:
-% <setdict> <htdict> <<proc>> <setdict'> <htdict'> <sethalftoneproc>
-% This allows us to use these procedures both for actually implementing
-% sethalftone and for converting subsidiary dictionaries of HalftoneType 5
-% halftones.
-systemdict begin
-15 dict /.halftonetypes 1 index def begin
- 1 {
- mark exch /Default exch .dicttomark { .sethalftone5 }
- } bind def
- 2 {
- 1 { /Frequency /Angle /SpotFunction } {
- /RedFrequency /RedAngle /RedSpotFunction
- /GreenFrequency /GreenAngle /GreenSpotFunction
- /BlueFrequency /BlueAngle /BlueSpotFunction
- /GrayFrequency /GrayAngle /GraySpotFunction
- } .makehalftoneRGBV
- } bind def
- 3 {
- mark exch /Default exch .dicttomark { .sethalftone5 }
- } bind def
- 4 {
- 3 { /Width /Height /Thresholds } {
- /RedWidth /RedHeight /RedThresholds
- /GreenWidth /GreenHeight /GreenThresholds
- /BlueWidth /BlueHeight /BlueThresholds
- /GrayWidth /GrayHeight /GrayThresholds
- } .makehalftoneRGBV
- } bind def
- 5 {
- pop dup length dict copy
- mark 1 index {
- % Even HalftoneType 5 dictionaries have entries other than
- % subsidiary halftone dictionaries.
- dup type /dicttype ne {
- 0
- } {
- dup /HalftoneType .knownget not { 0 } if
- } ifelse dup 5 gt {
- % Stack: dict mark ... keyN dictN httypeN
- % Assume that all HalftoneTypes > 5 convert to 5.
- 1 index 3 1 roll
- //.halftonetypes exch get exec pop /Default get
- % Stack: dict mark ... keyN setdict'N htdict'N
- counttomark 1 add index 3 index 4 -1 roll put
- } {
- pop
- } ifelse
- } forall .dicttomark { .sethalftone5 }
- } bind def
-end
-end
-/sethalftone { % <dict> sethalftone -
- % We must create the new dictionary in the same VM as the
- % operand; otherwise, invalidaccess errors may occur.
- .currentglobal 1 .argindex dup gcheck .setglobal
- dup //.halftonetypes 1 index /HalftoneType get
- dup type /integertype ne {
- /sethalftone .systemvar /typecheck signalerror
- } if
- .knownget not {
- /sethalftone .systemvar /rangecheck signalerror
- } if
- exec exec
- .setglobal pop
-} .bind 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
- languagelevel 3 ge { dup /AccurateScreens dup getuserparam put } if
- }
- if
- } bind def
-/setscreen % <ignore*2> <dict> setscreen -
- { dup type /dicttype eq
- { .fixsethalftonescreen sethalftone pop pop pop }
- { //setscreen }
- ifelse
- } .bind odef
-/setcolorscreen % <ignore*11> <dict> setcolorscreen -
- { dup type /dicttype eq
- { .fixsethalftonescreen sethalftone 12 { pop } repeat }
- { //setcolorscreen }
- ifelse
- } .bind 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 0.0 } % Adobe returns these as reals
- 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
- { % screen
- % The procedure might not be readable....
- dup rcheck { dup length array copy cvx } if
- 3 copy 6 copy
- }
- { } % colorscreen
- }
- exch get exec
-} odef
-
-% ------ User objects ------ %
-
-/.UserObjects {
- .userdict /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 -
- 1 index 65535 gt {
- % .localvmarray throws limitcheck but CET 31-02 wants rangecheck
- /defineuserobject .systemvar /rangecheck signalerror
- } if
- .UserObjects .knownget {
- length dup 3 .argindex le {
- % Stack: index value len
- 2 index eq { 1 index 2 mul } { 1 index 1 add } ifelse
- .localvmarray .UserObjects get
- 1 index copy pop
- .UserObjects 3 -1 roll put
- } {
- pop
- } ifelse
- } {
- .UserObjects 3 .argindex 1 add 10 .max .localvmarray put
- } ifelse
- .UserObjects get 2 .argindex 2 index put pop pop
-} odef
-/execuserobject { % <index> execuserobject -
- dup type /integertype ne {
- % Adobe validates the argument before accessing UserObjects - CET 31-03
- /execuserobject .systemvar /typecheck signalerror
- } if
- .UserObjects get 1 .argindex get exch pop exec
-} odef
-/undefineuserobject { % <index> undefineuserobject -
- dup type /integertype ne {
- % Adobe validates the argument before accessing UserObjects - CET 31-11
- /undefineuserobject .systemvar /typecheck signalerror
- } if
- .UserObjects get 1 .argindex //null put pop
-} odef
-
-% ------ Cache control ------ %
-
-% Dummy definitions for cache control operators
-
-/ucachestatus { % - ucachestatus -mark- ? ? ? ? <size>
- mark 0 0 0 0 /MaxUPathItem getuserparam
-} odef
-/setucacheparams { % -mark- ... <size> setucacheparams -
- % Provoke an appropriate error if needed.
- counttomark 1 lt { () 0 get } if
- dup 0 or /MaxUPathItem getuserparam .max
- 1 dict dup /MaxUPathItem 4 -1 roll put setuserparams cleartomark
-} odef
-
-end % level2dict