summaryrefslogtreecommitdiff
blob: 3a60a865f266a14b07893ee783162e76f5d8a998 (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
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
/* Copyright (C) 2001-2019 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.
*/


/* overprint/overprint mode compositor implementation */

#include "assert_.h"
#include "memory_.h"
#include "gx.h"
#include "gserrors.h"
#include "gsutil.h"             /* for gs_next_ids */
#include "gxcomp.h"
#include "gxdevice.h"
#include "gsdevice.h"
#include "gxgetbit.h"
#include "gsovrc.h"
#include "gxdcolor.h"
#include "gxoprect.h"
#include "gsbitops.h"
#include "gxgstate.h"
#include "gxdevsop.h"
#include "gxcldev.h"

/* GC descriptor for gs_overprint_t */
private_st_gs_overprint_t();

/*
 * Utility routine for encoding or decoding a color index. We cannot use
 * the general integer encoding routins for these, as they may be 64 bits
 * in length (the general routines are only designed for 32 bits). We also
 * cannot use the color-specific routines, as we do not have the required
 * device color information available.
 *
 * The scheme employed is the potentially 64-bit analog of the 32-bit
 * routines: the low order seven bits of each bytes represents a base-128
 * digit, and the high order bit is set if there is another digit. The
 * encoding order is little-endian.
 *
 * The write routine returns 0 on success, with *psize set to the number
 * of bytes used. Alternatively, the return value will be gs_error_rangecheck,
 * with *psize set to the number of bytes required, if there was insufficient
 * space.
 *
 * The read routine returns the number of bytes read on success, or < 0 in
 * the event of an error.
 */
static int
write_color_index(gx_color_index cindex, byte * data, uint * psize)
{
    int             num_bytes = 0;
    gx_color_index  ctmp = cindex;

    for (num_bytes = 1; (ctmp >>= 7) != 0; ++num_bytes)
        ;
    if (num_bytes > *psize) {
        *psize = num_bytes;
        return_error(gs_error_rangecheck);
    }
    ctmp = cindex;
    *psize = num_bytes;
    for (; num_bytes > 1; ctmp >>= 7, --num_bytes)
        *data++ = 0x80 | (ctmp & 0x7f);
    *data = ctmp & 0x7f;
    return 0;
}

static int
read_color_index(gx_color_index * pcindex, const byte * data, uint size)
{
    gx_color_index  cindex = 0;
    int             nbytes = 0, shift = 0;

    for (;; shift += 7, data++) {
        if (++nbytes > size)
            return_error(gs_error_rangecheck);
        else {
            unsigned char byte = *data;
            gx_color_index c = byte;

            cindex += (c & 0x7f) << shift;
            if ((c & 0x80) == 0)
                break;
        }
    }
    *pcindex = cindex;
    return nbytes;
}

/*
 * Check for equality of two overprint compositor objects.
 *
 * This is fairly simple.
 */
static bool
c_overprint_equal(const gs_composite_t * pct0, const gs_composite_t * pct1)
{
    if (pct0->type == pct1->type) {
        const gs_overprint_params_t *    pparams0;
        const gs_overprint_params_t *    pparams1;

        pparams0 = &((const gs_overprint_t *)(pct0))->params;
        pparams1 = &((const gs_overprint_t *)(pct1))->params;

        if (pparams0->is_fill_color != pparams1->is_fill_color)
            return true;		/* this changed */
        if (!pparams0->retain_any_comps)
            return !pparams1->retain_any_comps;
        else
            return pparams0->drawn_comps == pparams1->drawn_comps;
    } else
        return false;
}

/*
 * Bits corresponding to boolean values in the first byte of the string
 * representation of an overprint compositor.
 */
#define OVERPRINT_ANY_COMPS           1
#define OVERPRINT_IS_FILL_COLOR       2
#define OVERPRINT_SET_FILL_COLOR      0xc
#define OVERPRINT_EOPM                0x10

/*
 * Convert an overprint compositor to string form for use by the command
 * list device.
 */
static int
c_overprint_write(const gs_composite_t * pct, byte * data, uint * psize, gx_device_clist_writer *cdev)
{
    const gs_overprint_params_t *   pparams = &((const gs_overprint_t *)pct)->params;
    byte                            flags = 0;
    int                             used = 1, avail = *psize;

    /* Clist writer needs to store active state of op device so that
       we know when to send compositor actions to disable it */
    if (pparams->op_state == OP_STATE_NONE) {
        if (pparams->is_fill_color) {
            if (pparams->retain_any_comps)
                cdev->op_fill_active = true;
            else
                cdev->op_fill_active = false;
        } else {
            if (pparams->retain_any_comps)
                cdev->op_stroke_active = true;
            else
                cdev->op_stroke_active = false;
        }
    }

    /* encoded the booleans in a single byte */
    if (pparams->retain_any_comps || pparams->is_fill_color || pparams->op_state) {
        flags |= (pparams->retain_any_comps) ? OVERPRINT_ANY_COMPS : 0;
        flags |= (pparams->is_fill_color) ? OVERPRINT_IS_FILL_COLOR : 0;
        flags |= (pparams->op_state) << 2;
        flags |= (pparams->effective_opm) << 4;

        /* write out the component bits */
        if (pparams->retain_any_comps) {
            uint tmp_size = (avail > 0 ? avail - 1 : 0);
            int code = write_color_index(pparams->drawn_comps, data + 1,
                &tmp_size);
            if (code < 0 && code != gs_error_rangecheck)
                return code;
            used += tmp_size;
            if_debug0m('v', ((const gx_device*)cdev)->memory, "[v] drawn_comps stored\n");

        }
    }

    /* check for overflow */
    *psize = used;
    if (used > avail)
        return_error(gs_error_rangecheck);
    data[0] = flags;
    if_debug2m('v', ((const gx_device *)cdev)->memory, "[v]c_overprint_write(%d), drawn_comps=0x%x\n",
               flags, pparams->drawn_comps);
    return 0;
}

/*
 * Convert the string representation of the overprint parameter into the
 * full compositor.
 */
static int
c_overprint_read(
    gs_composite_t **       ppct,
    const byte *            data,
    uint                    size,
    gs_memory_t *           mem )
{
    gs_overprint_params_t   params;
    byte                    flags = 0;
    int                     code = 0, nbytes = 1;

    if (size < 1)
        return_error(gs_error_rangecheck);
    flags = *data;
    if_debug1m('v', mem, "[v]c_overprint_read(%d)", flags);
    params.retain_any_comps = (flags & OVERPRINT_ANY_COMPS) != 0;
    params.is_fill_color = (flags & OVERPRINT_IS_FILL_COLOR) != 0;
    params.op_state = (flags & OVERPRINT_SET_FILL_COLOR) >> 2;
    params.effective_opm = (flags & OVERPRINT_EOPM) >> 4;
    params.idle = 0;
    params.drawn_comps = 0;

    /* check if the drawn_comps array is present */
    if (params.retain_any_comps) {
        code = read_color_index(&params.drawn_comps, data + 1, size - 1);
        if (code < 0)
            return code;
        nbytes += code;
        if_debug0m('v', mem, ", drawn_comps read");
    }
    if_debug1m('v', mem, ", retain_any_comps=%d", params.retain_any_comps);
    if_debug1m('v', mem, ", is_fill_color=%d", params.is_fill_color);
    if_debug1m('v', mem, ", drawn_comps=0x%x", params.drawn_comps);
    if_debug1m('v', mem, ", op_state=%d", params.op_state);
    if_debug0m('v', mem, "\n");
    code = gs_create_overprint(ppct, &params, mem);
    return code < 0 ? code : nbytes;
}

/*
 * Check for closing compositor.
 */
static gs_compositor_closing_state
c_overprint_is_closing(const gs_composite_t *this, gs_composite_t **ppcte, gx_device *dev)
{
    return COMP_ENQUEUE;	/* maybe extra work, but these actions are fast */
}

static composite_create_default_compositor_proc(c_overprint_create_default_compositor);
static composite_equal_proc(c_overprint_equal);
static composite_write_proc(c_overprint_write);
static composite_is_closing_proc(c_overprint_is_closing);
static composite_read_proc(c_overprint_read);

/* methods for the overprint compositor */
const gs_composite_type_t   gs_composite_overprint_type = {
    GX_COMPOSITOR_OVERPRINT,
    {
        c_overprint_create_default_compositor,  /* procs.create_default_compositor */
        c_overprint_equal,                      /* procs.equal */
        c_overprint_write,                      /* procs.write */
        c_overprint_read,                       /* procs.read */
        gx_default_composite_adjust_ctm,
        c_overprint_is_closing,
        gx_default_composite_is_friendly,
        gx_default_composite_clist_write_update,/* procs.composite_clist_write_update */
        gx_default_composite_clist_read_update,	/* procs.composite_clist_reade_update */
        gx_default_composite_get_cropping	/* procs.composite_get_cropping */
    }                                           /* procs */
};

/*
 * Create an overprint compositor data structure.
 *
 * Currently this just a stub.
 */
int
gs_create_overprint(
    gs_composite_t **               ppct,
    const gs_overprint_params_t *   pparams,
    gs_memory_t *                   mem )
{
    gs_overprint_t *                pct;

    pct = gs_alloc_struct(mem, gs_overprint_t, &st_overprint,
                              "gs_create_overprint");
    if (pct == NULL)
        return_error(gs_error_VMerror);
    pct->type = &gs_composite_overprint_type;
    pct->id = gs_next_ids(mem, 1);
    pct->params = *pparams;
    pct->idle = false;
    *ppct = (gs_composite_t *)pct;
    return 0;
}

/*
 * Verify that a compositor data structure is for the overprint compositor.
 * This is used by the gs_pdf1.4_device (and eventually the PDFWrite
 * device), which implements overprint and overprint mode directly.
 */
int
gs_is_overprint_compositor(const gs_composite_t * pct)
{
    return pct->type == &gs_composite_overprint_type;
}

/*
 * The overprint device.
 *
 * In principle there are two versions of this device: one if the traget
 * device is separable and linear, the other if it is not. The two have
 * slightly different data structures, but differ primarily in terms of
 * the standard set of methods. Because methods are non-static in
 * GhostScript, we make use of the same data structure and handle the
 * distinction during initialization.
 *
 * The data fields reflect entries in the gs_overprint_params_t
 * structure. There is no explicit retain_any_comps field, as the current
 * setting of this field can be determined by checking the fill_rectangle
 * method.
 */
typedef struct overprint_device_s {
    gx_device_forward_common;

    /*
     * The set of components to be drawn. This field is used only if the
     * target color space is not separable and linear.  It is also used
     * for the devn color values since we may need more than 8 components
     */
    OP_FS_STATE op_state;					/* used to select drawn_comps, fill or stroke */
    gx_color_index  drawn_comps_fill;
    gx_color_index	drawn_comps_stroke;		/* pparams->is_fill_color determines which to set */
    bool retain_none_stroke;                /* These are used to know when we can set the procs to forward */
    bool retain_none_fill;

    /*
     * The mask of gx_color_index bits to be retained during a drawing
     * operation. A bit in this mask is 1 if the corresponding bit or
     * the color index is to be retained; otherwise it is 0.
     *
     * The "non-drawn" region of the drawing gx_color_index is assumed
     * to have the value zero, so for a separable and linear color
     * encoding, the per-pixel drawing operation is:
     *
     *  output = (output & retain_mask) | src
     *
     * (For the fully general case, replace src by (src & ~retain_mask).)
     * Because of byte-alignment, byte-order and performance consideration,
     * the actually implement operation may be more complex, but this does
     * not change the overall effect.
     *
     * The actual value of retain_mask will be byte swap if this is
     * required. It will be required if depth > 8 and the host processor
     * is little-endian.
     */
    gx_color_index  retain_mask_fill;
    gx_color_index	retain_mask_stroke;

    bool copy_alpha_hl;

    /* We hold 3 sets of device procedures here. These are initialised from
     * the equivalently named globals when the device is created, but are
     * then used from here as we fiddle with them. This ensures that the
     * globals are only ever read, and as such are safe in multithreaded
     * environments. */
    gx_device_procs generic_overprint_procs;
    gx_device_procs no_overprint_procs;
    gx_device_procs sep_overprint_procs;

    /* Due to the setting of stroke and fill overprint we can get in
       a situation where one makes the device idle.  We need to know
       if that is the case when doing a compositor push even when
       no parameters have changed */
    bool is_idle;

} overprint_device_t;

gs_private_st_suffix_add0_final( st_overprint_device_t,
                                 overprint_device_t,
                                 "overprint_device_t",
                                 overprint_device_t_enum_ptrs,
                                 overprint_device_t_reloc_ptrs,
                                 gx_device_finalize,
                                 st_device_forward);

/*
 * In the default (overprint false) case, the overprint device is almost
 * a pure forwarding device: only the open_device and create_compositor
 * methods are not pure-forwarding methods. The
 * gx_device_foward_fill_in_procs procedure does not fill in all of the
 * necessary procedures, so some of them are provided explicitly below.
 * The put_params procedure also requires a small modification, so that
 * the open/close state of this device always reflects that of its
 * target.
 *
 * This and other method arrays are not declared const so that they may
 * be initialized once via gx_device_forward_fill_in_procs. They are
 * constant once this initialization is complete.
 */
static dev_proc_open_device(overprint_open_device);
static dev_proc_put_params(overprint_put_params);
static dev_proc_get_page_device(overprint_get_page_device);
static dev_proc_create_compositor(overprint_create_compositor);
static dev_proc_get_color_comp_index(overprint_get_color_comp_index);
static dev_proc_fill_stroke_path(overprint_fill_stroke_path);
static dev_proc_fill_path(overprint_fill_path);
static dev_proc_stroke_path(overprint_stroke_path);
static dev_proc_text_begin(overprint_text_begin);
static  dev_proc_dev_spec_op(overprint_dev_spec_op);

static const gx_device_procs no_overprint_procs = {
    overprint_open_device,              /* open_device */
    0,                                  /* get_initial_matrix */
    0,                                  /* sync_output */
    0,                                  /* output_page */
    0,                                  /* close_device */
    0,                                  /* map_rgb_color */
    0,                                  /* map_color_rgb */
    gx_forward_fill_rectangle,          /* fill_rectangle */
    gx_forward_tile_rectangle,          /* tile_rectangle */
    gx_forward_copy_mono,               /* copy_mono */
    gx_forward_copy_color,              /* copy_color */
    0,                                  /* draw_line (obsolete) */
    0,                                  /* get_bits */
    0,                                  /* get_params */
    overprint_put_params,               /* put_params */
    0,                                  /* map_cmyk_color */
    0,                                  /* get_xfont_procs */
    0,                                  /* get_xfont_device */
    0,                                  /* map_rgb_alpha_color */
    overprint_get_page_device,          /* get_page_device */
    0,                                  /* get_alpha_bits (obsolete) */
    0,                                  /* copy alpha */
    0,                                  /* get_band */
    0,                                  /* copy_rop */
    0,                                  /* fill_path */
    0,                                  /* stroke_path */
    0,                                  /* fill_mask */
    0,                                  /* fill_trapezoid */
    0,                                  /* fill_parallelogram */
    0,                                  /* fill_triangle */
    0,                                  /* draw_thin_line */
    0,                                  /* begin_image */
    0,                                  /* image_data (obsolete) */
    0,                                  /* end_image (obsolete) */
    gx_forward_strip_tile_rectangle,    /* strip_tile_rectangle */
    0,                                  /* strip_copy_rop */
    0,                                  /* get_clipping_box */
    0,                                  /* begin_typed_image */
    0,                                  /* get_bits_rectangle */
    0,                                  /* map_color_rgb_alpha */
    overprint_create_compositor,        /* create_compositor */
    0,                                  /* get_hardware_params */
    0,                                  /* text_begin */
    0,                                  /* gx_finish_copydevice */
    0,                                  /* begin_transparency_group */
    0,                                  /* end_transparency_group */
    0,                                  /* being_transparency_mask */
    0,                                  /* end_transparency_mask */
    0,                                  /* discard_transparency_layer */
    0,                                  /* get_color_mapping_procs */
    overprint_get_color_comp_index,	/* get_color_comp_index */
    0,                                  /* encode_color */
    0,                                  /* decode_color */
    0,					/* pattern_manage */
    0,					/* fill_rectangle_hl_color */
    0,					/* include_color_space */
    0,					/* fill_linear_color_scanline */
    0,					/* fill_linear_color_trapezoid */
    0,					/* fill_linear_color_triangle */
    0,					/* update_spot_equivalent_colors */
    0,					/* ret_devn_params */
    gx_forward_fillpage,
    0,                                  /* push_transparency_state */
    0,                                  /* pop_transparency_state */
    0,                                  /* put_image */
    overprint_dev_spec_op,              /* dev_spec_op */
    gx_forward_copy_planes,
    0,                                  /* get profile */
    0,                                  /* set graphics type tag */
    0,                                  /* strip_copy_rop2 */
    0,                                  /* strip_tile_rect_devn */
    gx_forward_copy_alpha_hl_color,     /* copy_alpha_hl_color */
    NULL,                               /* process_page */\
    NULL,				/* transform_pixel_region */\
    gx_forward_fill_stroke_path,        /* fill_stroke */\
};

/*
 * If overprint is set, the high and mid-level rendering methods are
 * replaced by the default routines. The low-level color rendering methods
 * are replaced with one of two sets of functions, depending on whether or
 * not the target device has a separable and linear color encoding.
 *
 *  1. If the target device does not have a separable and linear
 *     encoding, an overprint-specific fill_rectangle method is used,
 *     and the default methods are used for all other low-level rendering
 *     methods. There is no way to achieve good rendering performance
 *     when overprint is true and the color encoding is not separable
 *     and linear, so there is little reason to use more elaborate
 *     methods int this case.
 *
 *  2. If the target device does have a separable and linear color
 *     model, at least the fill_rectangle method and potentially other
 *     methods will be replaced by overprint-specific methods. Those
 *     methods not replaced will have their default values. The number
 *     of methods replaced is dependent on the desired level of
 *     performance: the more methods, the better the performance.
 *
 *     Note that certain procedures, such as copy_alpha and copy_rop,
 *     are likely to always be given their default values, as the concepts
 *     of alpha-compositing and raster operations are not compatible in
 *     a strict sense.
 */
static dev_proc_fill_rectangle(overprint_generic_fill_rectangle);
static dev_proc_fill_rectangle(overprint_sep_fill_rectangle);
static dev_proc_fill_rectangle_hl_color(overprint_fill_rectangle_hl_color);
static dev_proc_copy_planes(overprint_copy_planes);
static dev_proc_copy_alpha_hl_color(overprint_copy_alpha_hl_color);

/* other low-level overprint_sep_* rendering methods prototypes go here */

static const gx_device_procs generic_overprint_procs = {
    overprint_open_device,              /* open_device */
    0,                                  /* get_initial_matrix */
    0,                                  /* sync_output */
    0,                                  /* output_page */
    0,                                  /* close_device */
    0,                                  /* map_rgb_color */
    0,                                  /* map_color_rgb */
    overprint_generic_fill_rectangle,   /* fill_rectangle */
    gx_default_tile_rectangle,          /* tile_rectangle */
    gx_default_copy_mono,               /* copy_mono */
    gx_default_copy_color,              /* copy_color */
    gx_default_draw_line,               /* draw_line (obsolete) */
    0,                                  /* get_bits */
    0,                                  /* get_params */
    overprint_put_params,               /* put_params */
    0,                                  /* map_cmyk_color */
    0,                                  /* get_xfont_procs */
    gx_default_get_xfont_device,        /* get_xfont_device */
    0,                                  /* map_rgb_alpha_color */
    overprint_get_page_device,          /* get_page_device */
    0,                                  /* get_alpha_bits (obsolete) */
    gx_default_copy_alpha,              /* copy alpha */
    0,                                  /* get_band */
    gx_default_copy_rop,                /* copy_rop */
    overprint_fill_path,                /* fill_path */
    overprint_stroke_path,              /* stroke_path */
    gx_default_fill_mask,               /* fill_mask */
    gx_default_fill_trapezoid,          /* fill_trapezoid */
    gx_default_fill_parallelogram,      /* fill_parallelogram */
    gx_default_fill_triangle,           /* fill_triangle */
    gx_default_draw_thin_line,          /* draw_thin_line */
    gx_default_begin_image,             /* begin_image */
    0,                                  /* image_data (obsolete) */
    0,                                  /* end_image (obsolete) */
    gx_default_strip_tile_rectangle,    /* strip_tile_rectangle */
    gx_default_strip_copy_rop,          /* strip_copy_rop */
    0,                                  /* get_clipping_box */
    gx_default_begin_typed_image,       /* begin_typed_image */
    0,                                  /* get_bits_rectangle */
    0,                                  /* map_color_rgb_alpha */
    overprint_create_compositor,        /* create_compositor */
    0,                                  /* get_hardware_params */
    overprint_text_begin,              /* text_begin */
    0,                                  /* gx_finish_copydevice */
    0,                                  /* begin_transparency_group */
    0,                                  /* end_transparency_group */
    0,                                  /* begin_transparency_mask */
    0,                                  /* end_transparency_mask */
    0,                                  /* discard_transparency_layer */
    0,                                  /* get_color_mapping_procs */
    overprint_get_color_comp_index,	/* get_color_comp_index */
    0,                                  /* encode_color */
    0,                                  /* decode_color */
    0,                                  /* pattern_manage */
    overprint_fill_rectangle_hl_color,  /* fill_rectangle_hl_color */
    0,                                  /* include_color_space */
    0,                                  /* fill_linear_color_scanline */
    0,                                  /* fill_linear_color_trapezoid */
    0,                                  /* fill_linear_color_triangle */
    0,                                  /* update_spot_equivalent_colors */
    0,                                  /* ret_devn_params */
    0,                                  /* fillpage */
    0,                                  /* push_transparency_state */
    0,                                  /* pop_transparency_state */
    0,                                  /* put_image */
    overprint_dev_spec_op,              /* dev_spec_op */
    gx_forward_copy_planes,
    0,                                  /* get profile */
    0,                                  /* set graphics type tag */
    0,                                  /* strip_copy_rop2 */
    0,                                  /* strip_tile_rect_devn */
    gx_forward_copy_alpha_hl_color,     /* copy_alpha_hl_color */
    NULL,                               /* process_page */\
    NULL,				/* transform_pixel_region */\
    overprint_fill_stroke_path,         /* fill_stroke */
};

static const gx_device_procs sep_overprint_procs = {
    overprint_open_device,              /* open_device */
    0,                                  /* get_initial_matrix */
    0,                                  /* sync_output */
    0,                                  /* output_page */
    0,                                  /* close_device */
    0,                                  /* map_rgb_color */
    0,                                  /* map_color_rgb */
    overprint_sep_fill_rectangle,       /* fill_rectangle */
    gx_default_tile_rectangle,          /* tile_rectangle */
    gx_default_copy_mono,               /* copy_mono */
    gx_default_copy_color,              /* copy_color */
    gx_default_draw_line,               /* draw_line (obsolete) */
    0,                                  /* get_bits */
    0,                                  /* get_params */
    overprint_put_params,               /* put_params */
    0,                                  /* map_cmyk_color */
    0,                                  /* get_xfont_procs */
    gx_default_get_xfont_device,        /* get_xfont_device */
    0,                                  /* map_rgb_alpha_color */
    overprint_get_page_device,          /* get_page_device */
    0,                                  /* get_alpha_bits (obsolete) */
    gx_default_copy_alpha,              /* copy alpha */
    0,                                  /* get_band */
    gx_default_copy_rop,                /* copy_rop */
    overprint_fill_path,                /* fill_path */
    overprint_stroke_path,              /* stroke_path */
    gx_default_fill_mask,               /* fill_mask */
    gx_default_fill_trapezoid,          /* fill_trapezoid */
    gx_default_fill_parallelogram,      /* fill_parallelogram */
    gx_default_fill_triangle,           /* fill_triangle */
    gx_default_draw_thin_line,          /* draw_thin_line */
    gx_default_begin_image,              /* begin_image */
    0,                                  /* image_data (obsolete) */
    0,                                  /* end_image (obsolete) */
    gx_default_strip_tile_rectangle,    /* strip_tile_rectangle */
    gx_default_strip_copy_rop,          /* strip_copy_rop */
    0,                                  /* get_clipping_box */
    gx_default_begin_typed_image,       /* begin_typed_image */
    0,                                  /* get_bits_rectangle */
    0,                                  /* map_color_rgb_alpha */
    overprint_create_compositor,        /* create_compositor */
    0,                                  /* get_hardware_params */
    overprint_text_begin,               /* text_begin */
    0,                                  /* gx_finish_copydevice */
    0,                                  /* begin_transparency_group */
    0,                                  /* end_transparency_group */
    0,                                  /* begin_transparency_mask */
    0,                                  /* end_transparency_mask */
    0,                                  /* discard_transparency_layer */
    0,                                  /* get_color_mapping_procs */
    overprint_get_color_comp_index,	    /* get_color_comp_index */
    0,                                  /* encode_color */
    0,                                  /* decode_color */
    0,                                  /* pattern_manage */
    overprint_fill_rectangle_hl_color,  /* fill_rectangle_hl_color */
    0,                                  /* include_color_space */
    0,                                  /* fill_linear_color_scanline */
    0,                                  /* fill_linear_color_trapezoid */
    0,                                  /* fill_linear_color_triangle */
    0,                                  /* update_spot_equivalent_colors */
    0,                                  /* ret_devn_params */
    0,                                  /* fillpage */
    0,                                  /* push_transparency_state */
    0,                                  /* pop_transparency_state */
    0,                                  /* put_image */
    overprint_dev_spec_op,              /* dev_spec_op */
    overprint_copy_planes,              /* copy planes */
    0,                                  /* get profile */
    0,                                  /* set graphics type tag */
    0,                                  /* strip_copy_rop2 */
    0,                                  /* strip_tile_rect_devn */
    overprint_copy_alpha_hl_color,      /* copy_alpha_hl_color */
    NULL,                               /* process_page */\
    NULL,				/* transform_pixel_region */\
    overprint_fill_stroke_path,         /* fill_stroke */
};

/*
 * The prototype for the overprint device does not provide much
 * information; it exists primarily to facilitate use gx_init_device
 * and sundry other device utility routines.
 */
const overprint_device_t    gs_overprint_device = {
    std_device_std_body_open( overprint_device_t,   /* device type */
                              0,                    /* static_procs */
                              "overprint_device",   /* dname */
                              0, 0,                 /* width, height */
                              1, 1 ),               /* HWResolution */
    { 0 }                                           /* procs */
};

/*
 * Utility to reorder bytes in a color or mask based on the endianness of
 * the current device. This is required on little-endian machines if the
 * depth is larger 8. The resulting value is also replicated to fill the
 * entire gx_color_index if the depth is a divisor of the color index
 * size. If this is not the case, the result will be in the low-order
 * bytes of the color index.
 *
 * Though this process can be handled in full generality, the code below
 * takes advantage of the fact that depths that are > 8 must be a multiple
 * of 8 and <= 64
 */
#if !ARCH_IS_BIG_ENDIAN

static gx_color_index
swap_color_index(int depth, gx_color_index color)
{
    int             shift = depth - 8;
    gx_color_index  mask = 0xff;

    color =  ((color >> shift) & mask)
           | ((color & mask) << shift)
           | (color & ~((mask << shift) | mask));
    if (depth > 24) {
        shift -= 16;
        mask <<= 8;
        color =  ((color >> shift) & mask)
               | ((color & mask) << shift)
               | (color & ~((mask << shift) | mask));

        if (depth > 40) {
            shift -= 16;
            mask <<= 8;
            color =  ((color >> shift) & mask)
                   | ((color & mask) << shift)
                   | (color & ~((mask << shift) | mask));

            if (depth > 56) {
                shift -= 16;
                mask <<= 8;
                color =  ((color >> shift) & mask)
                       | ((color & mask) << shift)
                       | (color & ~((mask << shift) | mask));
            }
        }
    }

    return color;
}

#endif  /* !ARCH_IS_BIG_ENDIAN */

/*
 * Update the retain_mask field to reflect the information in the
 * drawn_comps field. This is useful only if the device color model
 * is separable.
 */
static void
set_retain_mask(overprint_device_t * opdev, bool is_fill_color)
{
    uchar i, ncomps = opdev->color_info.num_components;
    gx_color_index  drawn_comps = is_fill_color ?
                                  opdev->drawn_comps_fill : opdev->drawn_comps_stroke;
    gx_color_index retain_mask = 0;
#if !ARCH_IS_BIG_ENDIAN
    int depth = opdev->color_info.depth;
#endif

    for (i = 0; i < ncomps; i++, drawn_comps >>= 1) {
        if ((drawn_comps & 0x1) == 0)
            retain_mask |= opdev->color_info.comp_mask[i];
    }
#if !ARCH_IS_BIG_ENDIAN
    if (depth > 8)
        retain_mask = swap_color_index(depth, retain_mask);
#endif
    if (is_fill_color)
        opdev->retain_mask_fill = retain_mask;
    else
        opdev->retain_mask_stroke = retain_mask;
}

/*
 * Update the overprint-specific device parameters.
 *
 * If spot colors are to be retain, the set of process (non-spot) colors is
 * determined by mapping through the standard color spaces and check which
 * components assume non-zero values.
 */
static int
update_overprint_params(
    overprint_device_t* opdev,
    const gs_overprint_params_t* pparams)
{
    /* We can only turn off the overprint compositor if
       BOTH the stroke and fill op are false.  Otherwise
       we will turn it off when setting one and turn on
       when setting the other (or vice versa) */

    /* Note if pparams is to set the opdev fill stroke state.  Do that now and exit */
    if (pparams->op_state != OP_STATE_NONE) {
        opdev->op_state = pparams->op_state;
        return 0;
    }

    if_debug4m(gs_debug_flag_overprint, opdev->memory,
        "[overprint] update_overprint_params enter. retain_any_comps = %d, idle = %d, drawn_comps = 0x%x, is_fill_color = %d\n",
        pparams->retain_any_comps, pparams->idle, pparams->drawn_comps, pparams->is_fill_color);

    /* check if overprint is to be turned off */
    if (!pparams->retain_any_comps || pparams->idle) {
        if (pparams->is_fill_color) {
            opdev->retain_none_fill = true;
            opdev->drawn_comps_fill =
                ((gx_color_index)1 << (opdev->color_info.num_components)) - (gx_color_index)1;
        } else {
            opdev->retain_none_stroke = true;
            opdev->drawn_comps_stroke =
                ((gx_color_index)1 << (opdev->color_info.num_components)) - (gx_color_index)1;
        }

        /* Set to forward only if both stroke and fill are not retaining any
           and if we have not already set it to forward */
        if (dev_proc(opdev, fill_rectangle) != gx_forward_fill_rectangle &&
            opdev->retain_none_fill && opdev->retain_none_stroke) {
            memcpy(&opdev->procs,
                &opdev->no_overprint_procs,
                sizeof(opdev->no_overprint_procs));
            opdev->is_idle = true;
            if_debug0m(gs_debug_flag_overprint, opdev->memory,
                "[overprint] overprint fill_rectangle set to forward\n");
        }

        if_debug4m(gs_debug_flag_overprint, opdev->memory,
            "[overprint] update_overprint_params exit. drawn_comps_fill = 0x%x, drawn_comps_stroke = 0x%x, retain_none_fill = %d, retain_none_stroke = %d \n",
            opdev->drawn_comps_fill, opdev->drawn_comps_stroke, opdev->retain_none_fill, opdev->retain_none_stroke);
        return 0;
    }

    opdev->is_idle = false;
    /* set the procedures according to the color model */
    if (colors_are_separable_and_linear(&opdev->color_info)) {
        memcpy(&opdev->procs, &opdev->sep_overprint_procs,
            sizeof(opdev->sep_overprint_procs));
        if_debug0m(gs_debug_flag_overprint, opdev->memory,
            "[overprint] overprint procs set to sep\n");
    } else {
        memcpy(&opdev->procs, &opdev->generic_overprint_procs,
            sizeof(opdev->generic_overprint_procs));
        if_debug0m(gs_debug_flag_overprint, opdev->memory,
            "[overprint] overprint procs set to generic\n");
    }

    if (pparams->is_fill_color) {
        opdev->retain_none_fill = false;
        opdev->drawn_comps_fill = pparams->drawn_comps;
    } else {
        opdev->retain_none_stroke = false;
        opdev->drawn_comps_stroke = pparams->drawn_comps;
    }

    if_debug4m(gs_debug_flag_overprint, opdev->memory,
        "[overprint] update_overprint_params exit. drawn_comps_fill = 0x%x, drawn_comps_stroke = 0x%x, retain_none_fill = %d, retain_none_stroke = %d \n",
        opdev->drawn_comps_fill, opdev->drawn_comps_stroke, opdev->retain_none_fill, opdev->retain_none_stroke);

    /* if appropriate, update the retain_mask field */
    if (colors_are_separable_and_linear(&opdev->color_info))
        set_retain_mask(opdev, pparams->is_fill_color);

    return 0;
}

/*
 * The open_device method for the overprint device is about as close to
 * a pure "forwarding" open_device operation as is possible. Its only
 * significant function is to ensure that the is_open field of the
 * overprint device matches that of the target device.
 *
 * We assume this procedure is called only if the device is not already
 * open, and that gs_opendevice will take care of the is_open flag.
 */
static int
overprint_open_device(gx_device * dev)
{
    overprint_device_t *    opdev = (overprint_device_t *)dev;
    gx_device *             tdev = opdev->target;
    int                     code = 0;

    /* the overprint device must have a target */
    if (tdev == 0)
        return_error(gs_error_unknownerror);
    if ((code = gs_opendevice(tdev)) >= 0) {
        gx_device_copy_params(dev, tdev);
        opdev->copy_alpha_hl = false;
        opdev->is_idle = false;
    }
    return code;
}

/*
 * The put_params method for the overprint device will check if the
 * target device has closed and, if so, close itself.
 */
static int
overprint_put_params(gx_device * dev, gs_param_list * plist)
{
    overprint_device_t *    opdev = (overprint_device_t *)dev;
    gx_device *             tdev = opdev->target;
    int                     code = 0;

    if (tdev != 0 && (code = dev_proc(tdev, put_params)(tdev, plist)) >= 0) {
        gx_device_decache_colors(dev);
        if (!tdev->is_open)
            code = gs_closedevice(dev);
    }
    return code;
}

/*
 * If the target device 'auto detects' new spot colors, then it will
 * change its color_info data.  Make sure that we have a current copy.
 */
int
overprint_get_color_comp_index(gx_device * dev, const char * pname,
                                        int name_size, int component_type)
{
    overprint_device_t * opdev = (overprint_device_t *)dev;
    gx_device * tdev = opdev->target;
    int code;

    if (tdev == 0)
        code = gx_error_get_color_comp_index(dev, pname,
                                name_size, component_type);
    else {
        code = dev_proc(tdev, get_color_comp_index)(tdev, pname,
                                name_size, component_type);
        opdev->color_info = tdev->color_info;
    }
    return code;
}

/*
 * The overprint device must never be confused with a page device.
 * Thus, we always forward the request for the page device to the
 * target, as should all forwarding devices.
 */
static gx_device *
overprint_get_page_device(gx_device * dev)
{
    overprint_device_t *    opdev = (overprint_device_t *)dev;
    gx_device *             tdev = opdev->target;

    return tdev == 0 ? 0 : dev_proc(tdev, get_page_device)(tdev);
}

/*
 * Calling create_compositor on the overprint device just updates the
 * overprint parameters; no new device is created.
 */
static int
overprint_create_compositor(
    gx_device *             dev,
    gx_device **            pcdev,
    const gs_composite_t *  pct,
    gs_gstate *	            pgs,
    gs_memory_t *           memory,
    gx_device *             cdev)
{
    if (pct->type != &gs_composite_overprint_type)
        return gx_default_create_compositor(dev, pcdev, pct, pgs, memory, cdev);
    else {
        gs_overprint_params_t params = ((const gs_overprint_t *)pct)->params;
        overprint_device_t *opdev = (overprint_device_t *)dev;
        int     code = 0;
        bool update;

        if (params.is_fill_color)
            update = (params.drawn_comps != opdev->drawn_comps_fill) ||
            ((params.retain_any_comps == 0) != opdev->retain_none_fill);
        else
            update = (params.drawn_comps != opdev->drawn_comps_stroke) ||
            ((params.retain_any_comps == 0) != opdev->retain_none_stroke);

        params.idle = pct->idle;
        /* device must already exist, so just update the parameters if settings change */
        if_debug6m(gs_debug_flag_overprint, opdev->memory,
            "[overprint] overprint_create_compositor test for change. params.idle = %d vs. opdev->is_idle = %d \n  params.is_fill_color = %d: params.drawn_comps = 0x%x vs. opdev->drawn_comps_fill =  0x%x OR opdev->drawn_comps_stroke = 0x%x\n",
            params.idle, opdev->is_idle, params.is_fill_color, params.drawn_comps, opdev->drawn_comps_fill, opdev->drawn_comps_stroke);

        if (update || params.idle != opdev->is_idle || params.op_state != OP_STATE_NONE)
            code = update_overprint_params(opdev, &params);
        if (code >= 0)
            *pcdev = dev;
        return code;
    }
}

/*
 * The two rectangle-filling routines (which do the actual work) are just
 * stubbs for the time being. The actual routines would allocate a buffer,
 * use get_bits_rectangle to build a buffer of the existing data, modify
 * the appropriate components, then invoke the copy_color procedure on the
 * target device.
 */
static int
overprint_generic_fill_rectangle(
    gx_device *     dev,
    int             x,
    int             y,
    int             width,
    int             height,
    gx_color_index  color )
{
    overprint_device_t *    opdev = (overprint_device_t *)dev;
    gx_device *             tdev = opdev->target;

    if (tdev == 0)
        return 0;
    else {

        assert(opdev->op_state != 0);

        /* See if we even need to do any overprinting.  We have to maintain
           the compositor active for fill/stroke cases even if we are only
           doing a fill or a stroke */
        if ((opdev->op_state == OP_STATE_FILL && opdev->retain_none_fill) ||
            (opdev->op_state == OP_STATE_STROKE && opdev->retain_none_stroke))
            return (*dev_proc(tdev, fill_rectangle)) (tdev, x, y, width, height, color);

        return gx_overprint_generic_fill_rectangle(tdev,
            opdev->op_state == OP_STATE_FILL ?
            opdev->drawn_comps_fill : opdev->drawn_comps_stroke,
            x, y, width, height, color, dev->memory);
    }
}

static int
overprint_copy_alpha_hl_color(gx_device * dev, const byte * data, int data_x,
           int raster, gx_bitmap_id id, int x, int y, int width, int height,
                      const gx_drawing_color *pdcolor, int depth)
{
    /* copy_alpha_hl_color will end up calling copy_planes which for the
       copy alpha case we need to make sure we do in a proper overprint
       fashion.  Other calls of copy_alpha for example from the pattern
       tiling call are not done with overprint control.  So we set an
       appopriate flag so that we know to handle this properly when we
       get to copy_alpha */

    overprint_device_t *    opdev = (overprint_device_t *)dev;
    int code;

    opdev->copy_alpha_hl = true;
    code = gx_default_copy_alpha_hl_color(dev, data, data_x, raster, id, x, y,
                                          width, height, pdcolor, depth);
    opdev->copy_alpha_hl = false;
    return code;
}

/* Currently we really should only be here if the target device is planar
   AND it supports devn colors AND is 8 bit.  This could use a rewrite to
   make if more efficient but I had to get something in place that would
   work */
static int
overprint_copy_planes(gx_device * dev, const byte * data, int data_x, int raster_in,
                  gx_bitmap_id id, int x, int y, int w, int h, int plane_height)
{
    overprint_device_t *    opdev = (overprint_device_t *)dev;
    gx_device *             tdev = opdev->target;
    byte *                  gb_buff = 0;
    gs_get_bits_params_t    gb_params;
    gs_int_rect             gb_rect;
    int                     code = 0;
    unsigned int            raster;
    int                     byte_depth;
    int                     depth;
    uchar                   num_comps;
    uchar                   k,j;
    gs_memory_t *           mem = dev->memory;
    gx_color_index          comps = opdev->op_state == OP_STATE_FILL ? opdev->drawn_comps_fill : opdev->drawn_comps_stroke;
    byte                    *curr_data = (byte *) data + data_x;
    int                     row, offset;

    if (tdev == 0)
        return 0;

    if  (opdev->copy_alpha_hl) {
       /* We are coming here via copy_alpha_hl_color due to the use of AA.
          We will want to handle the overprinting here */

        depth = tdev->color_info.depth;
        num_comps = tdev->color_info.num_components;

        fit_fill(tdev, x, y, w, h);
        byte_depth = depth / num_comps;

        /* allocate a buffer for the returned data */
        raster = bitmap_raster(w * byte_depth);
        gb_buff = gs_alloc_bytes(mem, raster * num_comps , "overprint_copy_planes");
        if (gb_buff == 0)
            return gs_note_error(gs_error_VMerror);

        /* Initialize the get_bits parameters. Here we just get a plane at a  time. */
        gb_params.options =  GB_COLORS_NATIVE
                           | GB_ALPHA_NONE
                           | GB_DEPTH_ALL
                           | GB_PACKING_PLANAR
                           | GB_RETURN_COPY
                           | GB_ALIGN_STANDARD
                           | GB_OFFSET_0
                           | GB_RASTER_STANDARD
                           | GB_SELECT_PLANES;

        gb_params.x_offset = 0;
        gb_params.raster = raster;
        gb_rect.p.x = x;
        gb_rect.q.x = x + w;

        /* step through the height */
        row = 0;
        while (h-- > 0 && code >= 0) {
            gb_rect.p.y = y++;
            gb_rect.q.y = y;
            offset = row * raster_in + data_x;
            row++;
            curr_data = (byte *) data + offset; /* start us at the start of row */
            /* And now through each plane */
            for (k = 0; k < tdev->color_info.num_components; k++) {
                /* First set the params to zero for all planes except the one we want */
                for (j = 0; j < tdev->color_info.num_components; j++)
                        gb_params.data[j] = 0;
                    gb_params.data[k] = gb_buff + k * raster;
                    code = dev_proc(tdev, get_bits_rectangle) (tdev, &gb_rect,
                                                               &gb_params, 0);
                    if (code < 0) {
                        gs_free_object(mem, gb_buff, "overprint_copy_planes" );
                        return code;
                    }
                    /* Skip the plane if this component is not to be drawn.  If
                       its the one that we want to draw, replace it with our
                       buffer data */
                    if ((comps & 0x01) == 1) {
                        memcpy(gb_params.data[k], curr_data, w);
                    }
                    /* Next plane */
                    curr_data += plane_height * raster_in;
                    comps >>= 1;
            }
            code = dev_proc(tdev, copy_planes)(tdev, gb_buff, 0, raster,
                                               gs_no_bitmap_id, x, y - 1, w, 1, 1);
        }
        gs_free_object(mem, gb_buff, "overprint_copy_planes" );
        return code;
    } else {
        /* This is not a case where copy planes should be doing overprinting.
           For example, if we came here via the pattern tiling code, so just
           pass this along to the target */
        return (*dev_proc(tdev, copy_planes)) (tdev, data, data_x, raster_in, id,
                                               x, y, w, h, plane_height);
    }
}
static void
my_memset16_be(uint16_t *dst, uint16_t col, size_t w)
{
#if !ARCH_IS_BIG_ENDIAN
    col = (col>>8) | (col<<8);
#endif
    while (w--) {
        *dst++ = col;
    }
}

/* Currently we really should only be here if the target device is planar
   AND it supports devn colors AND is 8 or 16 bit. */
static int
overprint_fill_rectangle_hl_color(gx_device *dev,
    const gs_fixed_rect *rect, const gs_gstate *pgs,
    const gx_drawing_color *pdcolor, const gx_clip_path *pcpath)
{
    overprint_device_t *    opdev = (overprint_device_t *)dev;
    gx_device *             tdev = opdev->target;
    byte *                  gb_buff = 0;
    gs_get_bits_params_t    gb_params;
    gs_int_rect             gb_rect;
    int                     code = 0;
    unsigned int            raster;
    int                     byte_depth;
    int                     depth;
    uchar                   num_comps;
    int                     x, y, w, h;
    uchar                   k, j;
    gs_memory_t *           mem = dev->memory;
    gx_color_index          comps;
    gx_color_index          mask;
    int                     shift;
    int                     deep;

    if (tdev == 0)
        return 0;

    assert(opdev->op_state != 0);

    /* See if we even need to do any overprinting.  We have to maintain
       the compositor active for fill/stroke cases even if we are only
       doing a fill or a stroke */
    if ((opdev->op_state == OP_STATE_FILL && opdev->retain_none_fill) ||
        (opdev->op_state == OP_STATE_STROKE && opdev->retain_none_stroke))
        return (*dev_proc(tdev, fill_rectangle_hl_color)) (tdev, rect, pgs, pdcolor, pcpath);

    depth = tdev->color_info.depth;
    num_comps = tdev->color_info.num_components;

    x = fixed2int(rect->p.x);
    y = fixed2int(rect->p.y);
    w = fixed2int(rect->q.x) - x;
    h = fixed2int(rect->q.y) - y;

    fit_fill(tdev, x, y, w, h);
    byte_depth = depth / num_comps;
    mask = ((gx_color_index)1 << byte_depth) - 1;
    shift = 16 - byte_depth;
    deep = byte_depth == 16;

    /* allocate a buffer for the returned data */
    raster = bitmap_raster(w * byte_depth);
    gb_buff = gs_alloc_bytes(mem, raster * num_comps , "overprint_fill_rectangle_hl_color");
    if (gb_buff == 0)
        return gs_note_error(gs_error_VMerror);

    /* Initialize the get_bits parameters. Here we just get a plane at a  time. */
    gb_params.options =  GB_COLORS_NATIVE
                       | GB_ALPHA_NONE
                       | GB_DEPTH_ALL
                       | GB_PACKING_PLANAR
                       | GB_RETURN_COPY
                       | GB_ALIGN_STANDARD
                       | GB_OFFSET_0
                       | GB_RASTER_STANDARD
                       | GB_SELECT_PLANES;

    gb_params.x_offset = 0;     /* for consistency */
    gb_params.raster = raster;
    gb_rect.p.x = x;
    gb_rect.q.x = x + w;

    /* step through the height */
    while (h-- > 0 && code >= 0) {
        gb_rect.p.y = y++;
        gb_rect.q.y = y;
        comps = opdev->op_state == OP_STATE_FILL ? opdev->drawn_comps_fill : opdev->drawn_comps_stroke;
        /* And now through each plane */
        for (k = 0; k < tdev->color_info.num_components; k++) {
            /* First set the params to zero for all planes except the one we want */
            for (j = 0; j < tdev->color_info.num_components; j++)
                gb_params.data[j] = 0;
            gb_params.data[k] = gb_buff + k * raster;
            code = dev_proc(tdev, get_bits_rectangle) (tdev, &gb_rect,
                                                       &gb_params, 0);
            if (code < 0) {
                gs_free_object(mem, gb_buff,
                               "overprint_fill_rectangle_hl_color" );
                return code;
            }
            /* Skip the plane if this component is not to be drawn.  We have
                to do a get bits for each plane due to the fact that we have
                to do a copy_planes at the end.  If we had a copy_plane
                operation we would just get the ones needed and set those. */
            if ((comps & 0x01) == 1) {
                /* Not sure if a loop or a memset is better here */
                if (deep)
                    my_memset16_be((uint16_t *)(gb_params.data[k]),
                                   pdcolor->colors.devn.values[k], w);
                else
                    memset(gb_params.data[k],
                           ((pdcolor->colors.devn.values[k]) >> shift & mask), w);
            }
            comps >>= 1;
        }
        code = dev_proc(tdev, copy_planes)(tdev, gb_buff, 0, raster,
                                           gs_no_bitmap_id, x, y - 1, w, 1, 1);
    }
    gs_free_object(mem, gb_buff,
                    "overprint_fill_rectangle_hl_color" );
    return code;
}

static int
overprint_sep_fill_rectangle(
    gx_device *     dev,
    int             x,
    int             y,
    int             width,
    int             height,
    gx_color_index  color )
{
    overprint_device_t *    opdev = (overprint_device_t *)dev;
    gx_device *             tdev = opdev->target;

    if (tdev == 0)
        return 0;
    else {
        int     depth = tdev->color_info.depth;

        assert(opdev->op_state != 0);

        /* See if we even need to do any overprinting.  We have to maintain
           the compositor active for fill/stroke cases even if we are only
           doing a fill or a stroke */
        if ((opdev->op_state == OP_STATE_FILL && opdev->retain_none_fill) ||
            (opdev->op_state == OP_STATE_STROKE && opdev->retain_none_stroke))
            return (*dev_proc(tdev, fill_rectangle)) (tdev, x, y, width, height, color);

        /*
         * Swap the color index into the order required by a byte-oriented
         * bitmap. This is required only for littl-endian processors, and
         * then only if the depth > 8.
         */
#if !ARCH_IS_BIG_ENDIAN
        if (depth > 8)
            color = swap_color_index(depth, color);
#endif

        /*
         * We can handle rectangle filling via bits_fill_rectangle_masked
         * if the depth is a divisor of 8 * sizeof(mono_fill_chunk). The
         * non-masked fill_rectangle code uses a byte-oriented routine
         * if depth > 8, but there is not much advantage to doing so if
         * masking is required.
         *
         * Directly testing (8 * sizeof(mono_fill_chunk)) % depth is
         * potentially expensive, since many rectangles are small. We
         * can avoid the modulus operation by noting that
         * 8 * sizeof(mono_fill_chunk) will be a power of 2, and so
         * we need only check that depth is a power of 2 and
         * depth < 8 * sizeof(mono_fill_chunk).
         */
        if ( depth <= 8 * sizeof(mono_fill_chunk) && (depth & (depth - 1)) == 0)
            return gx_overprint_sep_fill_rectangle_1(tdev, opdev->op_state == OP_STATE_FILL ?
                                                     opdev->retain_mask_fill : opdev->retain_mask_stroke,
                                                     x, y, width, height,
                                                     color, dev->memory);
        else
            return gx_overprint_sep_fill_rectangle_2(tdev, opdev->op_state == OP_STATE_FILL ?
                                                     opdev->retain_mask_fill : opdev->retain_mask_stroke,
                                                     x, y, width, height,
                                                     color, dev->memory);
    }
}

/* We need this to ensure the device knows we are doing a fill */
static int
overprint_fill_path(gx_device* pdev, const gs_gstate* pgs,
    gx_path* ppath, const gx_fill_params* params_fill,
    const gx_device_color* pdcolor, const gx_clip_path* pcpath)
{
    overprint_device_t* opdev = (overprint_device_t*)pdev;

    opdev->op_state = OP_STATE_FILL;
    return gx_default_fill_path(pdev, pgs, ppath, params_fill,
                                         pdcolor, pcpath);
}

/* We need this to ensure the device knows we are doing a stroke */
static int
overprint_stroke_path(gx_device* pdev, const gs_gstate* pgs,
    gx_path* ppath, const gx_stroke_params* params_stroke,
    const gx_device_color* pdcolor, const gx_clip_path* pcpath)
{
    overprint_device_t* opdev = (overprint_device_t*)pdev;
    int code;

    opdev->op_state = OP_STATE_STROKE;

    /* Stroke methods use fill path so set that to default to
       avoid mix up of is_fill_color */
    opdev->procs.fill_path = gx_default_fill_path;
    code = gx_default_stroke_path(pdev, pgs, ppath, params_stroke,
        pdcolor, pcpath);
    opdev->procs.fill_path = overprint_fill_path;

    return code;
}

/*
 *	Cannot use default_fill_stroke_path because we need to set the is_fill_color
 */
static int
overprint_fill_stroke_path(gx_device * pdev, const gs_gstate * pgs,
                           gx_path * ppath,
                           const gx_fill_params * params_fill,
                           const gx_device_color * pdevc_fill,
                           const gx_stroke_params * params_stroke,
                           const gx_device_color * pdevc_stroke,
                           const gx_clip_path * pcpath)
{
    int code;
    overprint_device_t *opdev = (overprint_device_t *)pdev;

    opdev->op_state = OP_STATE_FILL;
    code = dev_proc(pdev, fill_path)(pdev, pgs, ppath, params_fill, pdevc_fill, pcpath);
    if (code < 0)
        return code;

    /* Set up for stroke */
    opdev->op_state = OP_STATE_STROKE;
    code = dev_proc(pdev, stroke_path)(pdev, pgs, ppath, params_stroke, pdevc_stroke, pcpath);
    return code;
}

/* We need to make sure we are set up properly based upon the text mode */
static int
overprint_text_begin(gx_device* dev, gs_gstate* pgs,
    const gs_text_params_t* text, gs_font* font,
    gx_path* path, const gx_device_color* pdcolor,
    const gx_clip_path* pcpath,
    gs_memory_t* mem, gs_text_enum_t** ppte)
{
    overprint_device_t* opdev = (overprint_device_t*)dev;

    if (pgs->text_rendering_mode == 0)
        opdev->op_state = OP_STATE_FILL;
    else if (pgs->text_rendering_mode == 1)
        opdev->op_state = OP_STATE_STROKE;

    return gx_default_text_begin(dev, pgs, text, font,
        path, pdcolor, pcpath, mem, ppte);
}

static int
overprint_dev_spec_op(gx_device* pdev, int dev_spec_op,
    void* data, int size)
{
    overprint_device_t* opdev = (overprint_device_t*)pdev;
    gx_device* tdev = opdev->target;

    if (tdev == 0)
        return 0;

    if (dev_spec_op == gxdso_overprint_active)
        return !opdev->is_idle;

    return dev_proc(tdev, dev_spec_op)(tdev, dev_spec_op, data, size);
}

/* complete a procedure set */
static void
fill_in_procs(gx_device_procs * pprocs)
{
    gx_device_forward   tmpdev;

    /*
     * gx_device_forward_fill_in_procs calls gx_device_fill_in_procs, which
     * requires the color_info field of the device be set to "reasonable"
     * values. Which values is irrelevant in this case, but they must not
     * contain dangling pointers, excessive numbers of components, etc.
     */
    memcpy( &tmpdev.color_info,
            &gs_overprint_device.color_info,
            sizeof(tmpdev.color_info) );
    /*
     * Prevent the check_device_separable routine from executing while we
     * fill in the procs.  Our tmpdev is not complete enough for it.
     */
    tmpdev.color_info.separable_and_linear = GX_CINFO_SEP_LIN_NONE;
    tmpdev.static_procs = 0;
    memcpy(&tmpdev.procs, pprocs, sizeof(tmpdev.procs));
    gx_device_forward_fill_in_procs(&tmpdev);
    memcpy(pprocs, &tmpdev.procs, sizeof(tmpdev.procs));
}

/*
 * Create an overprint compositor.
 *
 * Note that this routine will be called only if the device is not already
 * an overprint compositor. Hence, if pct->params.retain_any_comps is
 * false, we can just return.
 */
static int
c_overprint_create_default_compositor(
    const gs_composite_t *  pct,
    gx_device **            popdev,
    gx_device *             tdev,
    gs_gstate *	            pgs,
    gs_memory_t *           mem )
{
    const gs_overprint_t *  ovrpct = (const gs_overprint_t *)pct;
    overprint_device_t *    opdev = 0;
    gs_overprint_params_t params;

    /* see if there is anything to do */
    if ( !ovrpct->params.retain_any_comps) {
        *popdev = tdev;
        return 0;
    }
    if (pct->idle) {
        *popdev = tdev;
        return 0;
    }

    /* build the overprint device */
    opdev = gs_alloc_struct_immovable(mem,
                                      overprint_device_t,
                                      &st_overprint_device_t,
                                      "create overprint compositor" );
    *popdev = (gx_device *)opdev;
    if (opdev == NULL)
        return_error(gs_error_VMerror);
    gx_device_init((gx_device *)opdev,
                   (const gx_device *)&gs_overprint_device,
                   mem,
                   false );
    memcpy(&opdev->no_overprint_procs,
           &no_overprint_procs,
           sizeof(no_overprint_procs));
    memcpy(&opdev->generic_overprint_procs,
           &generic_overprint_procs,
           sizeof(generic_overprint_procs));
    memcpy(&opdev->sep_overprint_procs,
           &sep_overprint_procs,
           sizeof(sep_overprint_procs));
    fill_in_procs(&opdev->no_overprint_procs);
    fill_in_procs(&opdev->generic_overprint_procs);
    fill_in_procs(&opdev->sep_overprint_procs);

    gx_device_copy_params((gx_device *)opdev, tdev);
    gx_device_set_target((gx_device_forward *)opdev, tdev);
    opdev->pad = tdev->pad;
    opdev->log2_align_mod = tdev->log2_align_mod;
    opdev->is_planar = tdev->is_planar;
    if (opdev->is_planar)
        opdev->generic_overprint_procs.copy_alpha_hl_color = overprint_copy_alpha_hl_color;

    params = ovrpct->params;
    params.idle = ovrpct->idle;

    /* Initialize the stroke and fill states */
    opdev->retain_none_fill = true;
    opdev->retain_none_stroke = true;

    /* set up the overprint parameters */
    return update_overprint_params(opdev, &params);
}