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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
-