summaryrefslogtreecommitdiff
path: root/Master/tlpkg/tlgs/Resource/Init/gs_setpd.ps
blob: 8fa7c51df153fe932038f78163b06522c3cb7ae8 (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
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
% Copyright (C) 2001-2018 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.
%

% The current implementation of setpagedevice has the following limitations:
%	- It doesn't attempt to "interact with the user" for Policy = 2.

languagelevel 1 .setlanguagelevel
level2dict begin

% ---------------- Redefinitions ---------------- %

% Redefine .beginpage and .endpage so that they call BeginPage and
% EndPage respectively if appropriate.

% We have to guard against the BeginPage procedure not popping its operand.
% This is really stupid, but the Genoa CET does it.
/.beginpage {		% - .beginpage -
  .currentshowpagecount {
    .currentpagedevice pop
    dup //null ne { /BeginPage .knownget } { pop //false } ifelse {
                % Stack: ... pagecount proc
       count 2 .execn
                % Stack: ... ..???.. oldcount
       count 1 add exch sub { pop } repeat
    } {
      pop
    } ifelse
  } if
} bind odef

% Guard similarly against EndPage not popping its operand.
/.endpage {		% <reason> .endpage <print_bool>
  .currentshowpagecount {
    1 index .currentpagedevice pop
    dup //null ne { /EndPage .knownget } { pop //false } ifelse {
                % Stack: ... reason pagecount reason proc
      count 2 .execn
                % Stack: ... ..???.. print oldcount
      count 2 add exch sub { exch pop } repeat
    } {
      pop pop 2 ne
    } ifelse
  } {
    2 ne
  } ifelse
} bind odef

% Define interpreter callouts for handling gstate-saving operators,
% to make sure that they create a page device dictionary for use by
% the corresponding gstate-restoring operator.
% We'd really like to avoid the cost of doing this, but we don't see how.
% The names %gsavepagedevice, %savepagedevice, %gstatepagedevice,
% %copygstatepagedevice, and %currentgstatepagedevice are known to the
% interpreter.

(%gsavepagedevice) cvn
 { currentpagedevice pop gsave
 } bind def

(%savepagedevice) cvn
 { currentpagedevice pop save
 } bind def

(%gstatepagedevice) cvn
 { currentpagedevice pop gstate
 } bind def

(%copygstatepagedevice) cvn
 { currentpagedevice pop copy
 } bind def

(%currentgstatepagedevice) cvn
 { currentpagedevice pop currentgstate
 } bind def

% Define interpreter callouts for handling gstate-restoring operators
% when the current page device needs to be changed.
% The names %grestorepagedevice, %grestoreallpagedevice,
% %restorepagedevice, %restore1pagedevice, and %setgstatepagedevice
% are known to the interpreter.

/.installpagedevice
 {	% Since setpagedevice doesn't create new device objects,
        % we must (carefully) reinstall the old parameters in
        % the same device.
   .currentpagedevice pop //null currentdevice //null
   { .trysetparams } .internalstopped
   {
     //null
   } if
   dup type /booleantype eq
    { pop pop }
    {
      SETPDDEBUG { (Error in .trysetparams!) = pstack flush } if
      {cleartomark pop pop pop} .internalstopped pop
      % if resetting the entire device state failed, at least put back the
      % security related key
      currentdevice //null //false mark /.LockSafetyParams
      currentpagedevice /.LockSafetyParams .knownget not
      {systemdict /SAFER .knownget not {//false} } if
      .putdeviceparamsonly
      /.installpagedevice cvx /rangecheck signalerror
    }
   ifelse pop pop
        % A careful reading of the Red Book reveals that an erasepage
        % should occur, but *not* an initgraphics.
   erasepage .beginpage
 } bind executeonly def

/.uninstallpagedevice
 {
   {2 .endpage { .currentnumcopies //false .outputpage } if} .internalstopped pop
   nulldevice
 } bind def

(%grestorepagedevice) cvn
 {
 .uninstallpagedevice
 grestore
 .installpagedevice
 } bind def

(%grestoreallpagedevice) cvn
 { .uninstallpagedevice grestore .installpagedevice grestoreall
 } bind def

(%restore1pagedevice) cvn
 { .uninstallpagedevice grestore .installpagedevice restore
 } bind def

(%restorepagedevice) cvn
 { .uninstallpagedevice restore .installpagedevice
 } bind def

(%setgstatepagedevice) cvn
 { .uninstallpagedevice setgstate .installpagedevice
 } bind def

% Redefine .currentnumcopies so it consults the NumCopies device parameter.
/.numcopiesdict mark
  /NumCopies dup
.dicttomark readonly def

/.currentnumcopies
 { currentdevice //.numcopiesdict .getdeviceparams
   dup type /integertype eq
    { exch pop exch pop }
    { cleartomark #copies }
   ifelse
 } bind odef

% Redefine .currentpagedevice and .setpagedevice so they convert between
% null and a fixed empty directionary.
/.nullpagedevice 0 dict readonly def
/.currentpagedevice {
  //.currentpagedevice exch dup //null eq { pop //.nullpagedevice } if exch
} bind odef
/.setpagedevice {
  dup //.nullpagedevice eq { pop //null } if //.setpagedevice
} bind odef

% ---------------- Auxiliary definitions ---------------- %

% Define the required attributes of all page devices, and their default values.
% We don't include attributes such as .MediaSize, which all devices
% are guaranteed to supply on their own.
/.defaultpolicies mark
  % M. Sweet, Easy Software Products
  %
  % Due to the fact that it is not possible to properly implement
  % the selection policies from a Ghostscript driver, we have changed
  % the default policy to "7" (impose) to avoid numerous problems with
  % printing within CUPS...
  %
  % If NOMEDIAATTRS is false, the set the default depending on whether
  % PSFitPage is true. Policy 13 does best fit with page scaling up or down
  % so it is only useful if FIXEDMEDIA is also specified, or if the set of
  % media in the InputAttributes dictionary is the actual available choices
  % and does not include any "range" page sizes.
  /PageSize NOMEDIAATTRS { 7 } { //systemdict /PSFitPage known { 13 } { 0 } ifelse } ifelse
  /PolicyNotFound 1
  /PolicyReport {
    dup /.LockSafetyParams known {
        % Only possible error is invalidaccess
      /setpagedevice .systemvar /invalidaccess signalerror
    }
    if
    pop
  } bind
.dicttomark readonly def
% Note that the values of .requiredattrs are executed, not just fetched.
/.requiredattrs mark
  /PageDeviceName //null
  /PageOffset [0 0] readonly
% We populate InputAttributes with all of the known page sizes
% followed by a dummy media type that handles pages of any size.
% This will create some duplicates, but that only slightly slows
% down the media selection (loop is in zmedia2.c).
%
% Some PostScript creators assume that slot 0 is the default media
% size and some can't handle a non-standard 4-element array which
% is a 'range' type page size (always put last).
%
% Real Devices that can only handle specific page sizes will override this.
  /InputAttributes {
    mark
    % First put the device's default page size in slot 0
    % This satifies those that have devices built with a4 as the default
    0 mark /PageSize /GetDeviceParam .special_op
    not {/setpagedevice .systemvar /configurationerror signalerror} if .dicttomark
    % Only populate the other entries if we aren't FIXEDMEDIA
    FIXEDMEDIA not {
      statusdict /.pagetypenames get {
        statusdict /.pagetypeprocs get
        exch get 0 2 getinterval cvlit
        counttomark 1 sub 2 idiv exch mark exch /PageSize exch
        % stack: mark --dict-- --dict-- ... key mark /PageSize [x y]
        % see note above about pagetype executable array contents.
        .dicttomark
      } forall
      % If NORANGEPAGESIZE is defined, (-dNORANGEPAGESIZE), then don't add
      % the 'match any' PageSize entry
      systemdict /NORANGEPAGESIZE known not {
        % Add one last entry which is the 4 element range array (non-standard)
        counttomark 2 idiv
          % PageSize with either dimension 0 will be detected in
          % match_page_size, so we can allow it here
        mark /PageSize [0 dup 16#7ffff dup] .dicttomark
      } if
    } if % FIXEDMEDIA false
    .dicttomark
  }
  (%MediaSource) 0
  /OutputAttributes {
    mark 0 mark .dicttomark readonly .dicttomark
  }
  (%MediaDestination) 0
  /Install {{.callinstall}} bind
  /BeginPage {{.callbeginpage}} bind
  /EndPage {{.callendpage}} bind
  /Policies .defaultpolicies
  /ImagingBBox //null		% default value
  /UseCIEColor /.getuseciecolor load
.dicttomark readonly def

% Define currentpagedevice so it creates the dictionary on demand if needed,
% adding all the required entries defined just above.

% We have to deal specially with entries that the driver may change
% on its own. We also have to deal specially with parameters which the device may
% change on its own but which we *also* want to transmit to the device. Previously
% any parameter which was 'dynamic' would not be sent to the device, making it
% impossible to set a parameter, and later have the device change it. Currently
% only OutputICCProfile fits this category.
% This whole area is broken its completely the wrong way round from the way the spec says it should work.

% This dictionary contains the keys we never want to set.
/.readonlypdkeys mark
  /.MediaSize dup		% because it changes when PageSize is set
  /PageCount dup
  /Colors dup
  /BitsPerPixel dup
  /ColorValues dup
.dicttomark readonly def

% Bonkers, but needed by our ridiculous setpagedevice implementation. There are
% some keys (at the moment, RedValues, GreenValues and BlueValues are known) which
% only exist in the page device dictionary under some conditions (ProcessColorModel == DeviceRGB)
% If we change the conditions, so that these keys are no longer present in the params
% returned by the device, sending these keys to the device can trigger a fault.
% This is a problem because of our stored dictionary:
%
% 1) Set up the inital dictioanry by retrieving the params from the device
% 2) Change the conditions (ProcessColorModel == DeviceGray)
% 3) merge any volatile keys from the device. Note that RedValues etc no longer defined.
% 4) Call .installpagdevice, use the stored dicitonary to set the params
% 5) The stored RedValues etc, cause an error.
%
% The stored dictioanry is readonly (we use forceput to wedge new keys into it) so
% we can't 'undef' keys from it. (the dictionary is made readonly by the action of zsetpagedevice
% '.setpagedevice' in PostScrfipt)
%
% So the only solution is to have 'write only' keys. These can be written to the device
% but are not stored in the saved page device dictionary. This means PostScript programs
% can't interrogate and take action on these, but there's no solution to that except to
% rewrite this stuff completely so that it actually works properly.

/.writeonlykeys mark
  /RedValues dup        % Set by the device when ProcessColorModel changes
  /GreenValues dup      % Set by the device when ProcessColorModel changes
  /BlueValues dup       % Set by the device when ProcessColorModel changes
  /GrayValues dup       % Set by the device when ProcessColorModel changes
.dicttomark readonly def

% This dictionary contains the keys we always want to read back from the device.
/.volatilepdkeys mark
  /.MediaSize dup		% because it changes when PageSize is set
  /RedValues dup        % Set by the device when ProcessColorModel changes
  /GreenValues dup      % Set by the device when ProcessColorModel changes
  /BlueValues dup       % Set by the device when ProcessColorModel changes
  /GrayValues dup       % Set by the device when ProcessColorModel changes
  /PageCount dup
  /Colors dup
  /BitsPerPixel dup
  /ColorValues dup
  /OutputICCProfile dup		% ColorConversionStrategy can change this
.dicttomark readonly def

/.makecurrentpagedevice {	% - .makecurrentpagedevice <dict>
  currentdevice //null .getdeviceparams
        % Make the dictionary large enough to add defaulted entries.
  counttomark 2 idiv .requiredattrs length add dict
  counttomark 2 idiv { dup 4 2 roll put } repeat exch pop
        % Add any missing required attributes.
        % Make a writable and (if possible) local copy of any default
        % dictionaries, to work around a bug in the output of WordPerfect,
        % which assumes that these dictionaries are writable and local.
  .currentglobal exch dup gcheck .setglobal
  .requiredattrs {
    2 index 2 index known {
      1 index /Policies eq {
        % Merge policies from the device driver with defaults
        2 index             % <<>> /key value <<>>
        3 2 roll get        % <<>> value <<policies>>
        exch {
          2 index 2 index known {
            pop pop
          } {
            2 index 3 1 roll put
          } ifelse
        } forall
        pop
      } {
        pop pop
      } ifelse
    } {
      exec 2 index 3 1 roll put
    } ifelse
  } forall exch .setglobal

  % Remove any keys we don't want to be stored, before .setpagedevice
  % makes the dictionary read only
  .writeonlykeys {2 index exch undef pop} forall
  dup .setpagedevice
} bind def
/currentpagedevice {
  .currentpagedevice {
    dup length 0 eq {
      pop .makecurrentpagedevice
    } {
                % If any of the dynamic keys have changed,
                % we must update the page device dictionary.
      currentdevice //.volatilepdkeys .getdeviceparams .dicttomark {
                % Stack: current key value
            2 index 2 index .knownget { 1 index ne } { //true } ifelse
             { 2 index wcheck not
                {	% This is the first entry being updated.
                        % Copy the dictionary to make it writable.
                  3 -1 roll
                  currentglobal 1 index dup gcheck currentglobal and setglobal
                  length dict
                  exch setglobal
                  .copydict
                  3 1 roll
                }
               if
               2 index 3 1 roll put
             }
             { pop pop
             }
            ifelse
      } forall
      % If the device is the distiller device, update distillerparams that
      % may have been changed by setdistillerparams
      /IsDistiller /GetDeviceParam .special_op {
        exch pop
      }{
        //false
      }ifelse
      {
          currentdistillerparams {
              % Stack: current key value
            2 index 2 index .knownget { 1 index ne } { //true } ifelse
            { 2 index 3 1 roll put } { pop pop } ifelse
          } forall
      } if
                % If the dictionary was global and is now local, copy
                % any global subsidiary dictionaries to local VM.  This
                % too is to work around the Word Perfect bug (see above).
      dup gcheck not {
        dup {
          dup type /dicttype eq { dup gcheck } { //false } ifelse {
                % Copy-on-write, see above.
            2 index wcheck not {
              3 -1 roll dup length dict .copydict
              3 1 roll
            } if
            .copytree 2 index 3 1 roll put
          } {
            pop pop
          } ifelse
        } forall
      } if
                % We would like to do a .setpagedevice so we don't keep
                % re-creating the dictionary.  Unfortunately, the effect
                % of this is that if any dynamic key changes (PageCount
                % in particular), we will do the equivalent of a
                % setpagedevice at the next restore or grestore.
                % Therefore, we make the dictionary read-only, but
                % we don't store it away.  I.e., NOT:
                % dup wcheck { .setpagedevice .currentpagedevice pop } if
      readonly
    } ifelse
  } if
} bind odef

% Copy a dictionary recursively.
/.copytree {	% <dict> .copytree <dict'>
  dup length dict exch {
    dup type /dicttype eq { .copytree } if 2 index 3 1 roll put
  } forall
} bind def

% The implementation of setpagedevice is quite complex.  Currently,
% everything but the media matching algorithm is implemented here.

% By default, we only present the requested changes to the device,
% but there are some parameters that require special merging action.
% Define those parameters here, with the procedures that do the merging.
% The procedures are called as follows:
%	<merged> <key> <new_value> -proc- <merged> <key> <new_value'>
/.mergespecial mark
  /InputAttributes
   { dup //null eq
      { pop //null
      }
      { 3 copy pop .knownget
         { dup //null eq
            { pop dup length dict }
            { dup length 2 index length add dict .copydict }
           ifelse
         }
         { dup length dict
         }
        ifelse .copydict readonly
      }
     ifelse
   } bind
  /OutputAttributes 1 index
  /Policies
    { 3 copy pop .knownget
       { dup length 2 index length add dict .copydict }
       { dup length dict }
      ifelse copy readonly
    } bind
.dicttomark readonly def

% M. Sweet, Easy Software Products:
%
% Define NOMEDIAATTRS to turn off the default (but unimplementable) media
% selection policies for setpagedevice.  This is used by CUPS to support
% the standard Adobe media attributes.
NOMEDIAATTRS {
  % Define only PageSize for input attribute matching.
  /.inputattrkeys [
    /PageSize
  ] readonly def
  % Define no other keys used in media selection.
  /.inputselectionkeys [
    /noInputSelectionsKeys
  ] readonly def

  % Define no keys used in output attribute matching.
  /.outputattrkeys [
    /noOutputAttrKeys
  ] readonly def
} {
  % Define the keys used in input attribute matching.
  /.inputattrkeys [
    /PageSize /MediaColor /MediaWeight /MediaType /InsertSheet /ManualFeed
          % The following are documented in Adobe's supplement for v2017.
    /LeadingEdge /MediaClass
  ] readonly def
  % Define other keys used in media selection.
  /.inputselectionkeys [
    /MediaPosition /Orientation
  ] readonly def

  % Define the keys used in output attribute matching.
  /.outputattrkeys [
    /OutputType
  ] readonly def
} ifelse

% Define all the parameters that should always be copied to the merged
% dictionary.
/.copiedkeys [
  /OutputDevice
  .mergespecial { pop } forall
  .inputattrkeys aload pop
  .inputselectionkeys aload pop
  .outputattrkeys aload pop
] readonly def

% Define the parameters that should not be presented to the device.
% The procedures are called as follows:
%	<merged> <key> <value> -proc-
% The procedure leaves all its operands on the stack and returns
% true iff the key/value pair should be presented to .putdeviceparams.
/.presentspecial mark
  .readonlypdkeys
      { pop //false }
  forall
                        % We must ignore an explicit request for .MediaSize,
                        % because media matching always handles this.
  /.MediaSize //false
  /Name //false
  /OutputDevice //false
  /PageDeviceName //false
  /PageOffset //false
  /PageSize //false		% obsolete alias for .MediaSize
  /InputAttributes //false
  .inputattrkeys
       { dup dup /PageSize eq exch /LeadingEdge eq or
       { pop }
       { { 2 index /InputAttributes .knownget { //null eq } { //true } ifelse } }
      ifelse
    }
  forall
  .inputselectionkeys { //false } forall
  /OutputAttributes //false
  .outputattrkeys
    { { 2 index /OutputAttributes .knownget { //null eq } { //true } ifelse } }
  forall
  /Install //false
  /BeginPage //false
  /EndPage //false
  /Policies //false
        % Our extensions:
  /HWColorMap
    {			% HACK: don't transmit the color map, because
                        % window systems can change the color map on their own
                        % incrementally.  Someday we'll have a better
                        % solution for this....
      //false
    }
  /ViewerPreProcess //false
  /ImagingBBox //false	% This prevents the ImagingBBox value in the setpagedevice
                        % from affecting the device's ImagingBBox parameter, but
                        % does retain a 'shadow' copy at the PostScript level.
                        % This is done for Adobe compatibility since Adobe does
                        % render marks outside the ImagingBBox (and QuarkXpress
                        % relies on it).
.dicttomark readonly def

% Define access to device defaults.
/.defaultdeviceparams
 { finddevice //null .getdeviceparams
 } bind def

% Select media (input or output).  The hard work is done in an operator:
%	<pagedict> <attrdict> <policydict> <keys> .matchmedia <key> true
%	<pagedict> <attrdict> <policydict> <keys> .matchmedia false
%	<pagedict> null <policydict> <keys> .matchmedia null true
/.selectmedia		% <orig> <request> <merged> <failed>     <-- retained
                        %   <attrdict> <policydict> <attrkeys> <mediakey>
                        %   .selectmedia
 { 5 index 5 -2 roll 4 index .matchmedia
                % Stack: orig request merged failed attrkeys mediakey
                %   (key true | false)
    { 4 index 3 1 roll put pop
    }
    {	% Adobe's implementations have a "big hairy heuristic"
        % to choose the set of keys to report as having failed the match.
        % For the moment, we report any keys that are in the request
        % and don't have the same value as in the original dictionary.
      5 index 1 index .knownget
       { 4 index 3 1 roll put }
       { 3 index exch .undef }
      ifelse
       {	% Stack: <orig> <request> <merged> <failed> <attrkey>
         3 index 1 index .knownget
          { 5 index 2 index .knownget { ne } { pop //true } ifelse }
          { //false }
         ifelse		% Stack: ... <failed> <attrkey> <report>
          { 2 copy /rangecheck put }
         if pop
       }
      forall
    }
   ifelse
 } bind def

% Apply Policies to any unprocessed failed requests.
% As we process each request entry, we replace the error name
% in the <failed> dictionary with the policy value,
% and we replace the key in the <merged> dictionary with its prior value
% (or remove it if it had no prior value).
/.policyprocs mark
% These procedures are called with the following on the stack:
%   <orig> <merged> <failed> <Policies> <key> <policy>
% They are expected to consume the top 2 operands.
% NOTE: we currently treat all values other than 0, 1, or 7 (for PageSize)
% the same as 0, i.e., we signal an error.
%
% M. Sweet, Easy Software Products:
%
% Define NOMEDIAATTRS to turn off the default (but unimplementable) media
% selection policies for setpagedevice.  This is used by CUPS to support
% the standard Adobe media attributes.
  0 {		% Set errorinfo and signal a configurationerror.
      NOMEDIAATTRS {
        % NOMEDIAATTRS means that the default policy is 7...
        pop 2 index exch 7 put
      } {
        pop dup 4 index exch get 2 array astore
        $error /errorinfo 3 -1 roll put
        cleartomark
        /setpagedevice .systemvar /configurationerror signalerror
      } ifelse
  } bind
  1 {		% Roll back the failed request to its previous status.
SETPDDEBUG { (Rolling back.) = pstack flush } if
        3 index 2 index 3 -1 roll .forceput
        4 index 1 index .knownget
         { 4 index 3 1 roll .forceput }
         { 3 index exch .undef }
        ifelse
  } .bind executeonly % must be bound and hidden for .forceput
  7 {		% For PageSize only, just impose the request.
        1 index /PageSize eq
         { pop pop 1 index /PageSize 7 put }
         { .policyprocs 0 get exec }
        ifelse
  } bind
.dicttomark readonly def
/.applypolicies		% <orig> <merged> <failed> .applypolicies
                        %   <orig> <merged'> <failed'>
 { 1 index /Policies get 1 index
    { type /integertype eq
       { pop		% already processed
       }
       { 2 copy .knownget not { 1 index /PolicyNotFound get } if
                        % Stack: <orig> <merged> <failed> <Policies> <key>
                        %   <policy>
         .policyprocs 1 index .knownget not { .policyprocs 0 get } if exec
       }
      ifelse
    }
   forall pop
 } bind def

% Prepare to present parameters to the device, by spreading them onto the
% operand stack and removing any that shouldn't be presented.
/.prepareparams		% <params> .prepareparams -mark- <key1> <value1> ...
 { mark exch dup
    {			% Stack: -mark- key1 value1 ... merged key value
      .presentspecial 2 index .knownget
       { exec { 3 -1 roll } { pop pop } ifelse }
       { 3 -1 roll }
      ifelse
    }
   forall pop
 } bind def

% Put device parameters without resetting currentpagedevice.
% (.putdeviceparams clears the current page device.)
/.putdeviceparamsonly	% <device> <Policies|null> <require_all> -mark-
                        %   <key1> <value1> ... .putdeviceparamsonly
                        % On success: <device> <eraseflag>
                        % On failure: <device> <Policies|null> <req_all> -mark-
                        %   <key1> <error1> ...
 { .currentpagedevice
    { counttomark 4 add 1 roll .putdeviceparams
      dup type /booleantype eq { 3 } { counttomark 5 add } ifelse -1 roll
      .setpagedevice
    }
    { pop .putdeviceparams
    }
   ifelse
 } bind def

% Try setting the device parameters from the merged request.
/.trysetparams		% <merged> <(ignored)> <device> <Policies>
                        %   .trysetparams
 { //true 4 index .prepareparams
                        % Add the computed .MediaSize.
                        % Stack: merged (ignored) device Policies -true-
                        %   -mark- key1 value1 ...
   counttomark 5 add index .computemediasize
   exch pop exch pop /.MediaSize exch
SETPDDEBUG { (Putting.) = pstack flush } if
   .putdeviceparamsonly
SETPDDEBUG { (Result of putting.) = pstack flush } if
 } bind def

% Compute the media size and initial matrix from a merged request (after
% media selection).
/.computemediasize	% <request> .computemediasize
                        %   <request> <matrix> <[width height]>
 { dup /PageSize get					% requested page size
   1 index /InputAttributes get
     2 index (%MediaSource) get get /PageSize get	% media size
                                                        % (may be a range)
   2 index /Policies get
     dup /PageSize .knownget
      { exch pop } { /PolicyNotFound get } ifelse	% PageSize policy,
                                                        % affects scaling
   3 index /Orientation .knownget not { //null } if
   4 index /RollFedMedia .knownget not { //false } if
   matrix .matchpagesize not {
                % This is a "can't happen" condition!
     /setpagedevice .systemvar /rangecheck signalerror
   } if
   2 array astore
 } bind def

% ---------------- setpagedevice itself ---------------- %

/setpagedevice
 {
                % To avoid VM mismatches caused by copying subsidiary
                % dictionaries to local VM (see WorPerfect bug in
                % .makecurrentpagedevice) we want to make the dict
                % returned by currentpagedevice local. However, if we
                % run with -dSAFER we get a call to setpagedevice from
                % .setsafe in gs_init.ps during startup. The dict returned
                % by currentpagdevice is stored to the graphics state by
                % .setpagedevice below, and returned by currentpagdevice.
                % The Display PostScript code insists that the savedinitialgstate
                % not have any pointers to local VM objects, so if we simply
                % make the dict local then we fail in gs_dps.ps. The only
                % solution is to make sure the VM mode is global during
                % startup (to satisfy gs_dps.ps) and local thereafter
                % (to satisfy the WordPerfect bug).
   dup /..StartupGlobal known
   {
       currentglobal exch true setglobal
       dup /..StartupGlobal undef
   } {
                % ensure that we are always in local VM mode to avoid
                % mismatches. This is because we always create child
                % dictionaries in local VM, regardless of the current VM state,
                % (see .makecurrentpagdevice) and we can't store local objects
                % in a global object, so we must ensure teh dictionary returned
                % from currentpagedevice is in local VM.
     currentglobal exch false setglobal
   } ifelse

   %% We used to execute endpage after .tsrysetparams, but that actually alters
   %% the page device dictionary (in particular /PageSize) this is not correct.
   %% Testing with Adobe Acrobat Distiller shows that EndPage is ececuted if the
   %% page device dictionary is empty, and indeed even if setpagedevice returns
   %% an error (caught by stopped), so it seems pretty clear that we should
   %% run any required EndPage very early in the setpagedevice process.
   %% Bug 690667.
   2 .endpage
   { 1 //true .outputpage
     (>>setpagedevice, press <return> to continue<<\n) .confirm
   }
   if
                % We mustn't pop the argument until the very end,
                % so that the pseudo-operator machinery can restore the stack
                % if an error occurs.
   mark 1 index currentpagedevice

                % Check whether we are changing OutputDevice;
                % also handle the case where the current device
                % is not a page device.
                % Stack: mark <request> <current>
SETPDDEBUG { (Checking.) = pstack flush } if

   dup /OutputDevice .knownget
    {		% Current device is a page device.
      2 index /OutputDevice .knownget
       {	% A specific OutputDevice was requested.
         2 copy eq
          { pop pop //null }
          { exch pop }
         ifelse
       }
       { pop //null
       }
      ifelse
    }
    {		% Current device is not a page device.
                % Use the default device.
      1 index /OutputDevice .knownget not { .defaultdevicename } if
    }
   ifelse
   dup //null eq
    { pop
    }
    { exch pop .defaultdeviceparams
                % In case of duplicate keys, .dicttomark takes the entry
                % lower on the stack, so we can just append the defaults here.
      .requiredattrs { exec } forall .dicttomark
    }
   ifelse

                % Check whether a viewer wants to intervene.
                % We must check both the request (which takes precedence)
                % and the current dictionary.
                % Stack: mark <request> <orig>
   exch dup /ViewerPreProcess .knownget
    { exec }
    { 1 index /ViewerPreProcess .knownget { exec } if }
   ifelse exch

                % Construct a merged request from the actual request plus
                % any keys that should always be propagated.
                % Stack: mark <request> <orig>
SETPDDEBUG { (Merging.) = pstack flush } if

   exch 1 index length 1 index length add dict
   .copiedkeys
    {		% Stack: <orig> <request> <merged> <key>
      3 index 1 index .knownget { 3 copy put pop } if pop
    }
   forall
                % Stack: <orig> <request> <merged>
   dup 2 index
    {		% stack: <orig> <request> <merged> <merged> <rkey> <rvalue>
      .mergespecial 2 index .knownget { exec } if
      put dup
    }
   forall pop
                % Hack: if FIXEDRESOLUTION is true, discard any attempt to
                % change HWResolution.
   FIXEDRESOLUTION { dup /HWResolution .undef } if
                % Hack: if FIXEDMEDIA is true, discard any attempt to change
                % PageSize or HWSize unless the PageSize Policy 13 (for FitPage).
   dup /Policies get /PageSize get 13 ne FIXEDMEDIA and 
    { dup /PageSize 4 index /PageSize get put
      dup /HWSize 4 index /HWSize get put
    } if
                % Hack: to work around some files that take a PageSize
                % from InputAttributes and impose it, discard any attempt
                % to set PageSize to a 4-element value.
                % Stack: mark <orig> <request> <merged>
    dup /PageSize .knownget {
      length 2 ne {
        dup /PageSize 4 index /PageSize get put
      } if
    } if

                % Select input and output media.
                % Stack: mark <orig> <request> <merged>
SETPDDEBUG { (Selecting.) = pstack flush } if

   0 dict	% <failed>
   1 index /InputAttributes .knownget
    { 2 index /Policies get
      .inputattrkeys (%MediaSource) cvn .selectmedia
    } if
   1 index /OutputAttributes .knownget
    { 2 index /Policies get
      .outputattrkeys (%MediaDestination) cvn .selectmedia
     } if
   3 -1 roll 4 1 roll		% temporarily swap orig & request
   .applypolicies
   3 -1 roll 4 1 roll		% swap back

                % Construct the new device, and attempt to set its attributes.
                % Stack: mark <orig> <request> <merged> <failed>
SETPDDEBUG { (Constructing.) = pstack flush } if

   currentdevice .devicename 2 index /OutputDevice get eq
    { currentdevice }
    { 1 index /OutputDevice get finddevice }
   ifelse
                %**************** We should copy the device here,
                %**************** but since we can't close the old device,
                %**************** we don't.  This is WRONG.
        %****************copydevice
   2 index /Policies get
   .trysetparams
   dup type /booleantype ne
    {		% The request failed.
                % Stack: ... <orig> <request> <merged> <failed> <device>
                %   <Policies> true mark <name> <errorname> ...
SETPDDEBUG { (Recovering.) = pstack flush } if
      counttomark 4 add index
      counttomark 2 idiv { dup 4 -2 roll put } repeat
      pop pop pop
                % Stack: mark ... <orig> <request> <merged> <failed> <device>
                %   <Policies>
      6 2 roll 3 -1 roll 4 1 roll
      .applypolicies
      3 -1 roll 4 1 roll 6 -2 roll
      .trysetparams		% shouldn't fail!
      dup type /booleantype ne
       { 2 { counttomark 1 add 1 roll cleartomark } repeat
         /setpagedevice .systemvar exch signalerror
       }
      if
    }
   if

                % The attempt succeeded.  Install the new device.
                % Stack: mark ... <merged> <failed> <device> <eraseflag>
SETPDDEBUG { (Installing.) = pstack flush } if

    pop
                % .setdevice clears the current page device!
   .currentpagedevice pop exch
   .setdevice pop
   .setpagedevice

                % Implement UseCIEColor directly if this is a LL3 system.
                % The color substitution feature is now implemented in
                % the interpreter, and this is used as an optimization.
                %
                % NB: This shoud be the only use of the .setuseciecolor
                %     operator anywhere.
                %
                % Set some color space other than /DeviceGray, to insure
                % that initgraphics will actually perform a setcolorspace
                % operation (there is an optimization in setcolorspace
                % that does nothing if the operand and current color
                % spaces are the same)

    /.setuseciecolor where
      {
        pop 1 index /UseCIEColor .knownget
          {
            .setuseciecolor /DeviceRGB setcolorspace
          }
        if
      }
    if

                % Merge the request into the current page device,
                % unless we're changing the OutputDevice.
                % Stack: mark ... <merged> <failed>
   exch currentpagedevice dup length 2 index length add dict
                % Stack: mark ... <failed> <merged> <current> <newdict>
   2 index /OutputDevice .knownget {
     2 index /OutputDevice .knownget not { //null } if eq
   } {
     //true
   } ifelse {
                % Same OutputDevice, merge the dictionaries.
     .copydict
   } {
                % Different OutputDevice, discard the old dictionary.
     exch pop
   } ifelse .copydict
                % Initialize the default matrix, taking media matching
                % into account.
   .computemediasize pop initmatrix concat
   dup /PageOffset .knownget
    {		% Translate by the given number of 1/72" units in device X/Y.
      dup 0 get exch 1 get
      2 index /HWResolution get dup 1 get exch 0 get
      4 -1 roll mul 72 div   3 1 roll mul 72 div
      idtransform translate
    }
   if
                % We must install the new page device dictionary
                % before calling the Install procedure.
  dup .setpagedevice
  /HighLevelDevice /GetDeviceParam .special_op {
    exch pop not
  }{
    //true
  }ifelse
  {
  .setdefaulthalftone	% Set the default screen before calling Install.
  } if
  dup /Install .knownget {
    { .execinstall } stopped {
      pop % Install procedure failed. One element will have been left on the stack.
      % stack: mark <orig> <request> <failed> <merged>
      1 index /Install $error /errorname get put	% Put it in the "failed" dict
      % .applypolicies needs stack: <orig> <merged> <failed>
      exch 4 2 roll exch 4 2 roll .applypolicies exch 4 2 roll exch 4 2 roll
      % Now execute the old Install -- failures after this are not handled
      dup /Install .knownget { { .execinstall } stopped { pop } if } if
      .postinstall stop
    } {
      .postinstall
    } ifelse
  } {
    .postinstall
  } ifelse
  setglobal           % return to original VM allocation mode
} odef

% We break out the code after calling the Install procedure into a
% separate procedure, since it is executed even if Install causes an error.
% By making .execinstall a separate operator procedure, we get the stacks
% mostly restored if it fails, except for one element (the operand).
% Thus if it fails, there will be one element left on the op stack.

/.execinstall {		% <proc> .execinstall -
  dup	% element left on the stack if the exec fails.

        % Because the interpreter optimizes tail calls, we can't just let
        % the body of this procedure be 'exec', because that would lose
        % the stack protection that is the whole reason for having the
        % procedure in the first place. The 'pop' for the dummy element
        % on the op stack suffices.
  exec
  pop	% See above.
} odef

/.postinstall {		% mark ... <failed> <merged> .postinstall -
   matrix currentmatrix .setdefaultmatrix
                % Erase and initialize the page.
   initgraphics
   currentoverprint //false setoverprint 1 setcolor
   .fillpage
   0 setcolor setoverprint
   .beginpage

                % Clean up, calling PolicyReport if needed.
                % Stack: mark ... <failed> <merged>
SETPDDEBUG { (Finishing.) = pstack flush } if

   exch dup length 0 ne
    { 1 index /Policies get /PolicyReport get
      counttomark 1 add 2 roll cleartomark
      exec
    }
    { cleartomark
    }
   ifelse pop

} odef

end				% level2dict
.setlanguagelevel