summaryrefslogtreecommitdiff
path: root/Master/tlpkg/tlgs/Resource/Init/gs_dps2.ps
blob: 2dfaaa49865174cc9b42c5532211c5f3a28ae004 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
% Copyright (C) 2001-2020 Artifex Software, Inc.
% 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.
%
% Refer to licensing information at http://www.artifex.com or contact
% Artifex Software, Inc.,  1305 Grant Avenue - Suite 200, Novato,
% CA 94945, U.S.A., +1(415)492-9861, for further information.
%

% 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 exec readonly
             }
             { /HalftoneType 2		% colorscreen
                { /RedFrequency /RedAngle /RedSpotFunction
                  /GreenFrequency /GreenAngle /GreenSpotFunction
                  /BlueFrequency /BlueAngle /BlueSpotFunction
                  /GrayFrequency /GrayAngle /GraySpotFunction
                }
               //.makestackdict exec readonly
             }
           }
          exch get exec
        } odef
currentdict /.makestackdict undef

% 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 exec
  } 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 exec
  } 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
currentdict /.makehalftoneRGBV undef

/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 dict .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 exec sethalftone pop pop pop }
           { //setscreen }
          ifelse
        } .bind odef
/setcolorscreen		% <ignore*11> <dict> setcolorscreen -
        { dup type /dicttype eq
           { //.fixsethalftonescreen exec sethalftone 12 { pop } repeat }
           { //setcolorscreen }
          ifelse
        } .bind odef
currentdict /.fixsethalftonescreen undef

% 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 exec }% halftone
             { }				% screen
             { 12 3 roll 9 { pop } repeat	% colorscreen
               dup type /dicttype eq { //.fixcurrenthalftonescreen exec } if
             }
           }
          exch get exec
        } odef
/currentcolorscreen	% - currentcolorscreen (60 0 <dict>)*4
{ .currenthalftone
   { { //.fixcurrenthalftonescreen exec 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
currentdict /.fixcurrenthalftonescreen undef

% ------ User objects ------ %

/.UserObjects {
  .userdict /UserObjects
} bind executeonly 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
} .bind 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
} .bind 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
} .bind odef
currentdict /.UserObjects undef

% ------ 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