summaryrefslogtreecommitdiff
path: root/source/gprf/gprf-doc.c
blob: 34a293bdaaf1ac483fe0c7eb8011eaeaa5daefdc (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
#include "mupdf/fitz.h"

#if FZ_ENABLE_GPRF
/* Choose whether to call gs via an exe or via an API */
#if defined(__ANDROID__) || defined(GSVIEW_WIN)
#define USE_GS_API
#endif
/* GSVIEW on Windows does not support stdout stderr */
#ifdef GSVIEW_WIN
#define GS_API_NULL_STDIO
#endif

#include "mupdf/fitz.h"

#if defined(USE_GS_API)

/* We are assumed to be using the DLL here */
#define GSDLLEXPORT
#ifdef _MSC_VER
#define GSDLLAPI __stdcall
#else
#define GSDLLAPI
#endif

#ifndef GSDLLCALL
#define GSDLLCALL
#endif

/*
	We can either rely on the official iapi.h from ghostscript
	(which is not supplied in the MuPDF source), or we can use
	a potted version of it inline here (which suffices for
	android, but has not been verified on all platforms).
*/
#if HAVE_IAPI_H
#include "iapi.h"
#else
/* Avoid having to #include the gs api */
extern GSDLLEXPORT int GSDLLAPI gsapi_new_instance(void **, void *);
extern GSDLLEXPORT int GSDLLAPI gsapi_init_with_args(void *, int, char *argv[]);
extern GSDLLEXPORT void GSDLLAPI gsapi_delete_instance(void *);
extern GSDLLEXPORT int GSDLLAPI gsapi_set_stdio(void *, int (GSDLLCALL *)(void *, char *, int), int (GSDLLCALL *)(void *, const char *, int), int (GSDLLCALL *)(void *, const char *, int));
#endif /* HAVE_IAPI_H */
#endif /* USE_GS_API */

typedef struct gprf_document_s gprf_document;
typedef struct gprf_chapter_s gprf_chapter;
typedef struct gprf_page_s gprf_page;

/* Quality trumps speed for this file */
#ifndef SLOWCMYK
#define SLOWCMYK
#endif

enum
{
	GPRF_TILESIZE = 256
};

struct gprf_document_s
{
	fz_document super;
	char *gprf_filename;
	char *pdf_filename;
	char *print_profile;
	char *display_profile;
	int res;
	int num_pages;
	struct {
		int w;
		int h;
	} *page_dims;
};

typedef struct gprf_file_s
{
	int refs;
	char *filename;
} gprf_file;

static gprf_file *
fz_new_gprf_file(fz_context *ctx, char *filename)
{
	gprf_file *file = fz_malloc_struct(ctx, gprf_file);
	file->refs = 1;
	file->filename = filename;

	return file;
}

static gprf_file *
fz_keep_gprf_file(fz_context *ctx, gprf_file *file)
{
	return fz_keep_imp(ctx, file, &file->refs);
}

static void
fz_drop_gprf_file(fz_context *ctx, gprf_file *file)
{
	if (fz_drop_imp(ctx, file, &file->refs))
	{
		unlink(file->filename);
		fz_free(ctx, file->filename);
		fz_free(ctx, file);
	}
}

struct gprf_page_s
{
	fz_page super;
	gprf_document *doc;
	gprf_file *file;
	int number;
	fz_separations *separations;
	int width;
	int height;
	int tile_width;
	int tile_height;
	int num_tiles;
	fz_image **tiles;
};

typedef struct fz_image_gprf_s
{
	fz_image super;
	fz_off_t offset[FZ_MAX_SEPARATIONS+3+1]; /* + RGB + END */
	gprf_file *file;
	fz_separations *separations;
} fz_image_gprf;

static int
gprf_count_pages(fz_context *ctx, fz_document *doc_)
{
	gprf_document *doc = (gprf_document*)doc_;
	return doc->num_pages;
}

static void
gprf_drop_page_imp(fz_context *ctx, fz_page *page_)
{
	gprf_page *page = (gprf_page*)page_;
	gprf_document *doc = page->doc;
	int i;

	fz_drop_document(ctx, &doc->super);
	if (page->tiles)
	{
		for (i = 0; i < page->num_tiles; i++)
			fz_drop_image(ctx, page->tiles[i]);
		fz_free(ctx, page->tiles);
	}
	fz_drop_separations(ctx, page->separations);
	fz_drop_gprf_file(ctx, page->file);
}

static fz_rect *
gprf_bound_page(fz_context *ctx, fz_page *page_, fz_rect *bbox)
{
	gprf_page *page = (gprf_page*)page_;
	gprf_document *doc = page->doc;

	/* BBox is in points, not pixels */
	bbox->x0 = 0;
	bbox->y0 = 0;
	bbox->x1 = 72.0f * page->width / doc->res;
	bbox->y1 = 72.0f * page->height / doc->res;

	return bbox;
}

static void
fz_drop_image_gprf_imp(fz_context *ctx, fz_storable *image_)
{
	fz_image_gprf *image = (fz_image_gprf *)image_;

	fz_drop_gprf_file(ctx, image->file);
	fz_drop_separations(ctx, image->separations);
	fz_drop_image_base(ctx, image->super);
}

static inline unsigned char *cmyk_to_rgba(unsigned char *out, uint32_t c, uint32_t m, uint32_t y, uint32_t k)
{
	/* c m y k in 0 to 65535 range on entry */
	uint32_t r, g, b;
#ifdef SLOWCMYK /* FP version originally from poppler */
	uint32_t x;
	uint32_t cm, c1m, cm1, c1m1;
	uint32_t c1m1y, c1m1y1, c1my, c1my1, cm1y, cm1y1, cmy, cmy1;

	/* We use some tricks here:
	 *	x + (x >> 15)
	 * converts x from 0..65535 to 0..65536
	 *	(A * B) >> 16
	 * multiplies A (0..65535) and B (0..65536) to give a 0...65535 result.
	 * (This relies on A and B being unsigned).
	 *
	 * We also rely on the fact that if:
	 *	C = (A * B) >> 16
	 * for A (0..65535) and B (0..65536) then A - C is also in (0..65535)
	 * as C cannot possibly be any larger than A.
	 */
	cm = (c * (m + (m>>15)))>>16;
	c1m = m - cm;
	cm1 = c - cm;
	c1m1 = 65535 - m - cm1; /* Need to clamp for underflow here */
	if ((int)c1m1 < 0)
		c1m1 = 0;
	y += (y>>15);
	c1m1y = (c1m1 * y)>>16;
	c1m1y1 = c1m1 - c1m1y;
	c1my = (c1m * y)>>16;
	c1my1 = c1m - c1my;
	cm1y = (cm1 * y)>>16;
	cm1y1 = cm1 - cm1y;
	cmy = (cm * y)>>16;
	cmy1 = cm - cmy;

#define CONST16(x) ((int)(x * 65536.0f + 0.5f))

	k += (k>>15); /* Move k to be 0..65536 */

	/* this is a matrix multiplication, unrolled for performance */
	x = (c1m1y1 * k)>>16;	/* 0 0 0 1 */
	r = g = b = c1m1y1 - x;	/* 0 0 0 0 */
	r += (CONST16(0.1373f) * x)>>16;
	g += (CONST16(0.1216f) * x)>>16;
	b += (CONST16(0.1255f) * x)>>16;

	x = (c1m1y * k)>>16;	/* 0 0 1 1 */
	r += (CONST16(0.1098f) * x)>>16;
	g += (CONST16(0.1020f) * x)>>16;
	x = c1m1y - x;		/* 0 0 1 0 */
	r += x;
	g += (CONST16(0.9490f) * x)>>16;

	x = (c1my1 * k)>>16;	/* 0 1 0 1 */
	r += (CONST16(0.1412f) * x)>>16;
	x = c1my1 - x;		/* 0 1 0 0 */
	r += (CONST16(0.9255f) * x)>>16;
	b += (CONST16(0.5490f) * x)>>16;

	x = (c1my * k)>>16;	/* 0 1 1 1 */
	r += (CONST16(0.1333f) * x)>>16;
	x = c1my - x;		/* 0 1 1 0 */
	r += (CONST16(0.9294f) * x)>>16;
	g += (CONST16(0.1098f) * x)>>16;
	b += (CONST16(0.1412f) * x)>>16;

	x = (cm1y1 * k)>>16;	/* 1 0 0 1 */
	g += (CONST16(0.0588f) * x)>>16;
	b += (CONST16(0.1412f) * x)>>16;
	x = cm1y1 - x;		/* 1 0 0 0 */
	g += (CONST16(0.6784f) * x)>>16;
	b += (CONST16(0.9373f) * x)>>16;

	x = (cm1y * k)>>16;	/* 1 0 1 1 */
	g += (CONST16(0.0745f) * x)>>16;
	x = cm1y - x;		/* 1 0 1 0 */
	g += (CONST16(0.6510f) * x)>>16;
	b += (CONST16(0.3137f) * x)>>16;

	x = (cmy1 * k)>>16;	/* 1 1 0 1 */
	b += (CONST16(0.0078f) * x)>>16;
	x = cmy1 - x;		/* 1 1 0 0 */
	r += (CONST16(0.1804f) * x)>>16;
	g += (CONST16(0.1922f) * x)>>16;
	b += (CONST16(0.5725f) * x)>>16;

	x = (cmy * (65536-k))>>16;	/* 1 1 1 0 */
	r += (CONST16(0.2118f) * x)>>16;
	g += (CONST16(0.2119f) * x)>>16;
	b += (CONST16(0.2235f) * x)>>16;
	/* I have convinced myself that r, g, b cannot have underflowed at
	 * thus point. I have not convinced myself that they won't have
	 * overflowed though. */
	r >>= 8;
	if (r > 255)
		r = 255;
	g >>= 8;
	if (g > 255)
		g = 255;
	b >>= 8;
	if (b > 255)
		b = 255;
#else
	k = 65536 - k;
	r = k - c;
	g = k - m;
	b = k - y;

	r >>= 8;
	if ((int)r < 0)
		r = 0;
	else if (r > 255)
		r = 255;
	g >>= 8;
	if ((int)g < 0)
		g = 0;
	else if (g > 255)
		g = 255;
	b >>= 8;
	if ((int)b < 0)
		b = 0;
	else if (b > 255)
		b = 255;
#endif

	*out++ = r;
	*out++ = g;
	*out++ = b;
	*out++ = 0xFF;
	return out;
}

unsigned char undelta(unsigned char delta, unsigned char *ptr, int len)
{
	do
	{
		delta = (*ptr++ += delta);
	}
	while (--len);

	return delta;
}

static fz_pixmap *
gprf_get_pixmap(fz_context *ctx, fz_image *image_, fz_irect *area, int w, int h, int *l2factor)
{
	/* The file contains RGB + up to FZ_MAX_SEPARATIONS. Hence the
	 * "3 + FZ_MAX_SEPARATIONS" usage in all the arrays below. */
	fz_image_gprf *image = (fz_image_gprf *)image_;
	fz_pixmap *pix = fz_new_pixmap(ctx, image->super.colorspace, image->super.w, image->super.h, 1);
	fz_stream *file[3 + FZ_MAX_SEPARATIONS] = { NULL };
	int read_sep[3 + FZ_MAX_SEPARATIONS] = { 0 };
	int num_seps, i, j, n;
	enum { decode_chunk_size = 64 };
	unsigned char data[(3 + FZ_MAX_SEPARATIONS) * decode_chunk_size];
	unsigned char delta[3 + FZ_MAX_SEPARATIONS] = { 0 };
	unsigned char equiv[3 + FZ_MAX_SEPARATIONS][4];
	int bytes_per_channel = image->super.w * image->super.h;
	unsigned char *out = fz_pixmap_samples(ctx, pix);

	fz_var(file);

	if (area)
	{
		area->x0 = 0;
		area->y0 = 0;
		area->x1 = image->super.w;
		area->y1 = image->super.h;
	}

	fz_try(ctx)
	{
		/* First off, figure out if we are doing RGB or separations
		 * decoding. */
		num_seps = 3 + fz_count_separations(ctx, image->separations);
		if (fz_separations_all_enabled(ctx, image->separations))
		{
			num_seps = 3;
			for (i = 0; i < 3; i++)
				read_sep[i] = 1;
		}
		else
		{
			for (i = 3; i < num_seps; i++)
			{
				read_sep[i] = !fz_separation_disabled(ctx, image->separations, i-3);
				if (read_sep[i])
				{
					uint32_t rgb, cmyk;

					(void)fz_get_separation(ctx, image->separations, i - 3, &rgb, &cmyk);
					equiv[i][0] = (cmyk>> 0) & 0xFF;
					equiv[i][1] = (cmyk>> 8) & 0xFF;
					equiv[i][2] = (cmyk>>16) & 0xFF;
					equiv[i][3] = (cmyk>>24) & 0xFF;
				}
			}
		}

		/* Open 1 file handle per channel */
		for (i = 0; i < num_seps; i++)
		{
			if (!read_sep[i])
				continue;

			if (image->offset[i] == image->offset[i+1])
			{
				read_sep[i] = 2;
				memset(&data[i * decode_chunk_size], 0, decode_chunk_size);
			}
			file[i] = fz_open_file(ctx, image->file->filename);
			fz_seek(ctx, file[i], image->offset[i], SEEK_SET);
			file[i] = fz_open_flated(ctx, file[i], 15);
		}

		/* Now actually do the decode */
		for (j = 0; j < bytes_per_channel; j += decode_chunk_size)
		{
			int len = bytes_per_channel - j;
			if (len > decode_chunk_size)
				len = decode_chunk_size;

			/* Load data with the unpacked channel bytes */
			for (i = 0; i < num_seps; i++)
			{
				if (read_sep[i] == 1)
				{
					fz_read(ctx, file[i], &data[i * decode_chunk_size], len);
					delta[i] = undelta(delta[i], &data[i * decode_chunk_size], len);
				}
			}

			/* And unpack */
			if (num_seps == 3)
			{
				for (n = 0; n < len; n++)
				{
					*out++ = data[0 * decode_chunk_size + n];
					*out++ = data[1 * decode_chunk_size + n];
					*out++ = data[2 * decode_chunk_size + n];
					*out++ = 0xFF; /* Alpha */
				}
			}
			else
			{
				for (n = 0; n < len; n++)
				{
					int c, m, y, k;

					c = m = y = k = 0;
					for (i = 3; i < num_seps; i++)
					{
						int v;
						if (read_sep[i] != 1)
							continue;
						v = data[i * decode_chunk_size + n];
						v += (v>>7);
						c += v * equiv[i][0];
						m += v * equiv[i][1];
						y += v * equiv[i][2];
						k += v * equiv[i][3];
					}
					out = cmyk_to_rgba(out, c, m, y, k);
				}
			}
		}
	}
	fz_always(ctx)
	{
		for (i = 0; i < 3+num_seps; i++)
			fz_drop_stream(ctx, file[i]);
	}
	fz_catch(ctx)
	{
		fz_drop_pixmap(ctx, pix);
		fz_rethrow(ctx);
	}

	return pix;
}

static fz_image *
fz_new_gprf_image(fz_context *ctx, gprf_page *page, int imagenum, fz_off_t offsets[], fz_off_t end)
{
	fz_image_gprf *image = fz_malloc_struct(ctx, fz_image_gprf);
	int tile_x = imagenum % page->tile_width;
	int tile_y = imagenum / page->tile_width;
	int w = GPRF_TILESIZE;
	int h = GPRF_TILESIZE;
	int seps = fz_count_separations(ctx, page->separations);

	if (tile_x == page->tile_width-1)
	{
		w = page->width % GPRF_TILESIZE;
		if (w == 0)
			w = GPRF_TILESIZE;
	}
	if (tile_y == page->tile_height-1)
	{
		h = page->height % GPRF_TILESIZE;
		if (h == 0)
			h = GPRF_TILESIZE;
	}

	FZ_INIT_KEY_STORABLE(&image->super, 1, fz_drop_image_gprf_imp);
	image->super.w = w;
	image->super.h = h;
	image->super.n = 4; /* Always RGB + Alpha */
	image->super.colorspace = fz_keep_colorspace(ctx, fz_device_rgb(ctx));
	image->super.bpc = 8;
	image->super.get_pixmap = gprf_get_pixmap;
	image->super.xres = page->doc->res;
	image->super.yres = page->doc->res;
	image->super.mask = NULL;
	image->file = fz_keep_gprf_file(ctx, page->file);
	memcpy(image->offset, offsets, sizeof(fz_off_t) * (3+seps));
	image->offset[seps+3] = end;
	image->separations = fz_keep_separations(ctx, page->separations);

	return &image->super;
}

#ifndef USE_GS_API
static void
fz_system(fz_context *ctx, const char *cmd)
{
	int ret = system(cmd);

	if (ret != 0)
		fz_throw(ctx, FZ_ERROR_GENERIC, "child process reported error %d", ret);
}
#endif

static int GSDLLCALL
gsdll_stdout(void *instance, const char *str, int len)
{
#ifndef GS_API_NULL_STDIO
	int remain = len;
	char text[32];

	while (remain)
	{
		int l = remain;
		if (l > sizeof(text)-1)
			l = sizeof(text)-1;
		memcpy(text, str, l);
		text[l] = 0;
		fprintf(stdout, "%s", text);
		remain -= l;
		str += l;
	}
#endif
	return len;
}

static int GSDLLCALL
gsdll_stderr(void *instance, const char *str, int len)
{
#ifndef GS_API_NULL_STDIO
	int remain = len;
	char text[32];

	while (remain)
	{
		int l = remain;
		if (l > sizeof(text)-1)
			l = sizeof(text)-1;
		memcpy(text, str, l);
		text[l] = 0;
		fprintf(stderr, "%s", text);
		remain -= l;
		str += l;
	}
#endif
	return len;
}

static void
generate_page(fz_context *ctx, gprf_page *page)
{
	gprf_document *doc = page->doc;
	char nameroot[32];
	char *filename;
	char *disp_profile = NULL;
	char *print_profile = NULL;
	int len;

	/* put the page file in the same directory as the gproof file */
	sprintf(nameroot, "gprf_%d_", page->number);
	filename = fz_tempfilename(ctx, nameroot, doc->gprf_filename);

/*
	When invoking gs via the GS API, we need to give the profile
	names unquoted. When invoking via system, we need to quote them.
	Use a #define to keep the code simple.
*/
#ifdef USE_GS_API
#define QUOTE
#else
#define QUOTE "\""
#endif

	/* Set up the icc profiles */
	if (strlen(doc->display_profile) == 0)
	{
		len = sizeof("-sPostRenderProfile=srgb.icc");
		disp_profile = (char*)fz_malloc(ctx, len + 1);
		sprintf(disp_profile, "-sPostRenderProfile=srgb.icc");
	}
	else
	{
		len = sizeof("-sPostRenderProfile=" QUOTE QUOTE); /* with quotes */
		disp_profile = (char*)fz_malloc(ctx, len + strlen(doc->display_profile) + 1);
		sprintf(disp_profile, "-sPostRenderProfile=" QUOTE "%s" QUOTE, doc->display_profile);
	}

	if (strlen(doc->print_profile) == 0)
	{
		len = sizeof("-sOutputICCProfile=default_cmyk.icc");
		print_profile = (char*)fz_malloc(ctx, len + 1);
		sprintf(print_profile, "-sOutputICCProfile=default_cmyk.icc");
	}
	else if (strcmp(doc->print_profile, "<EMBEDDED>") != 0)
	{
		len = sizeof("-sOutputICCProfile=" QUOTE QUOTE); /* with quotes */
		print_profile = (char*)fz_malloc(ctx, len + strlen(doc->print_profile) + 1);
		sprintf(print_profile, "-sOutputICCProfile=" QUOTE "%s" QUOTE, doc->print_profile);
	}

	fz_try(ctx)
	{
#ifdef USE_GS_API
		void *instance;
		int code;
		char *argv[20];
		char arg_fp[32];
		char arg_lp[32];
		char arg_g[32];
		int argc = 0;

		argv[argc++] = "gs";
		argv[argc++] = "-sDEVICE=gprf";
		if (print_profile == NULL)
			argv[argc++] = "-dUsePDFX3Profile";
		else
			argv[argc++] = print_profile;
		argv[argc++] = disp_profile;
		argv[argc++] = "-dFitPage";
		argv[argc++] = "-o";
		argv[argc++] = filename;
		sprintf(arg_fp, "-dFirstPage=%d", page->number+1);
		argv[argc++] = arg_fp;
		sprintf(arg_lp, "-dLastPage=%d", page->number+1);
		argv[argc++] = arg_lp;
		argv[argc++] = "-I%rom%Resource/Init/";
		sprintf(arg_g, "-g%dx%d", page->width, page->height);
		argv[argc++] = arg_g;
		argv[argc++] = doc->pdf_filename;
		assert(argc <= sizeof(argv)/sizeof(*argv));

		code = gsapi_new_instance(&instance, ctx);
		if (code < 0)
			fz_throw(ctx, FZ_ERROR_GENERIC, "GS startup failed: %d", code);
		gsapi_set_stdio(instance, NULL, gsdll_stdout, gsdll_stderr);
#ifndef NDEBUG
		{
			int i;
			fprintf(stderr, "Invoking GS\n");
			for (i = 0; i < argc; i++)
			{
				fprintf(stderr, "%s\n", argv[i]);
			}
		}
#endif
		code = gsapi_init_with_args(instance, argc, argv);

		gsapi_delete_instance(instance);
		if (code < 0)
			fz_throw(ctx, FZ_ERROR_GENERIC, "GS run failed: %d", code);
#else
		char gs_command[1024];
		/* Invoke gs to convert to a temp file. */
		sprintf(gs_command, "gswin32c.exe -sDEVICE=gprf %s %s -dFitPage -o \"%s\" -dFirstPage=%d -dLastPage=%d -I%%rom%%Resource/Init/ -g%dx%d \"%s\"",
			print_profile == NULL ? "-dUsePDFX3Profile" : print_profile, disp_profile,
			filename, page->number+1, page->number+1, page->width, page->height, doc->pdf_filename);
		fz_system(ctx, gs_command);
#endif

		page->file = fz_new_gprf_file(ctx, filename);
	}
	fz_always(ctx)
	{
		fz_free(ctx, print_profile);
		fz_free(ctx, disp_profile);
	}
	fz_catch(ctx)
	{
		unlink(filename);
		fz_free(ctx, filename);
		fz_rethrow(ctx);
	}
}

static void
read_tiles(fz_context *ctx, gprf_page *page)
{
	fz_stream *file;
	int32_t val;
	uint64_t offset;
	int num_tiles;
	int num_seps;
	int i, x, y;
	int64_t off;

	/* Clear up any aborted attempts before (unlikely) */
	fz_drop_separations(ctx, page->separations);
	page->separations = NULL;

	file = fz_open_file(ctx, page->file->filename);

	fz_try(ctx)
	{
		val = fz_read_int32_le(ctx, file);
		if (val != 0x46505347)
			fz_throw(ctx, FZ_ERROR_GENERIC, "Unexpected signature in GSPF file");

		val = fz_read_int16_le(ctx, file);
		if (val != 1)
			fz_throw(ctx, FZ_ERROR_GENERIC, "Unexpected version in GSPF file");

		val = fz_read_int16_le(ctx, file);
		if (val != 0)
			fz_throw(ctx, FZ_ERROR_GENERIC, "Unexpected compression in GSPF file");

		val = fz_read_int32_le(ctx, file);
		if (val != page->width)
			fz_throw(ctx, FZ_ERROR_GENERIC, "Unexpected width in GSPF file");

		val = fz_read_int32_le(ctx, file);
		if (val != page->height)
			fz_throw(ctx, FZ_ERROR_GENERIC, "Unexpected height in GSPF file");

		val = fz_read_int16_le(ctx, file);
		if (val != 8)
			fz_throw(ctx, FZ_ERROR_GENERIC, "Unexpected bpc in GSPF file");

		num_seps = fz_read_int16_le(ctx, file);
		if (num_seps < 0 || num_seps > FZ_MAX_SEPARATIONS)
			fz_throw(ctx, FZ_ERROR_GENERIC, "Unexpected number of separations in GSPF file");

		offset = fz_read_int64_le(ctx, file); /* Ignore the ICC for now */

		/* Read the table offset */
		offset = fz_read_int64_le(ctx, file);

		/* Skip to the separations */
		fz_seek(ctx, file, 64, SEEK_SET);
		page->separations = fz_new_separations(ctx);
		for (i = 0; i < num_seps; i++)
		{
			char blatter[4096];
			int32_t rgba = fz_read_int32_le(ctx, file);
			int32_t cmyk = fz_read_int32_le(ctx, file);
			fz_read_string(ctx, file, blatter, sizeof(blatter));
			fz_add_separation(ctx, page->separations, rgba, cmyk, blatter);
		}

		/* Seek to the image data */
		fz_seek(ctx, file, (fz_off_t)offset, SEEK_SET);

		num_tiles = page->tile_width * page->tile_height;
		page->tiles = fz_calloc(ctx, num_tiles, sizeof(fz_image *));

		i = 0;
		off = fz_read_int64_le(ctx, file);
		for (y = 0; y < page->tile_height; y++)
		{
			for (x = 0; x < page->tile_width; x++)
			{
				fz_off_t offsets[FZ_MAX_SEPARATIONS + 3]; /* SEPARATIONS + RGB */
				int j;

				for (j = 0; j < num_seps+3; j++)
				{
					offsets[j] = (fz_off_t)off;
					off = fz_read_int64_le(ctx, file);
				}

				page->tiles[i] = fz_new_gprf_image(ctx, page, i, offsets, (fz_off_t)off);
				i++;
			}
		}
	}
	fz_always(ctx)
	{
		fz_drop_stream(ctx, file);
	}
	fz_catch(ctx)
	{
		/* Free any tiles made so far */
		for (i = num_tiles - 1; i >= 0; i--)
		{
			fz_drop_image(ctx, page->tiles[i]);
		}
		fz_free(ctx, page->tiles);

		fz_rethrow(ctx);
	}
	page->num_tiles = num_tiles;
}

static void
gprf_run_page(fz_context *ctx, fz_page *page_, fz_device *dev, const fz_matrix *ctm, fz_cookie *cookie)
{
	gprf_page *page = (gprf_page*)page_;
	gprf_document *doc = page->doc;
	int i, y, x;

	/* If we have no page, generate it. */
	if (page->file == NULL)
	{
		generate_page(ctx, page);
	}
	/* If we have no tiles, generate them. */
	if (page->num_tiles == 0)
	{
		read_tiles(ctx, page);
	}

	/* Send the images to the page */
	fz_render_flags(ctx, dev, FZ_DEVFLAG_GRIDFIT_AS_TILED, 0);
	i = 0;
	for (y = 0; y < page->tile_height; y++)
	{
		float scale = GPRF_TILESIZE * 72.0f / doc->res;
		for (x = 0; x < page->tile_width; x++)
		{
			fz_matrix local;
			float scale_x = page->tiles[i]->w * 72.0f / doc->res;
			float scale_y = page->tiles[i]->h * 72.0f / doc->res;
			local.a = scale_x;
			local.b = 0;
			local.c = 0;
			local.d = scale_y;
			local.e = x * scale;
			local.f = y * scale;
			fz_concat(&local, &local, ctm);
			fz_fill_image(ctx, dev, page->tiles[i++], &local, 1.0f, NULL);
		}
	}
	fz_render_flags(ctx, dev, 0, FZ_DEVFLAG_GRIDFIT_AS_TILED);
}

static int gprf_count_separations(fz_context *ctx, fz_page *page_)
{
	gprf_page *page = (gprf_page *)page_;

	return fz_count_separations(ctx, page->separations);
}

static void gprf_control_separation(fz_context *ctx, fz_page *page_, int sep, int disable)
{
	gprf_page *page = (gprf_page *)page_;

	fz_control_separation(ctx, page->separations, sep, disable);
}

static int gprf_separation_disabled(fz_context *ctx, fz_page *page_, int sep)
{
	gprf_page *page = (gprf_page *)page_;

	return fz_separation_disabled(ctx, page->separations, sep);
}

static const char *gprf_get_separation(fz_context *ctx, fz_page *page_, int sep, uint32_t *rgba, uint32_t*cmyk)
{
	gprf_page *page = (gprf_page *)page_;

	return fz_get_separation(ctx, page->separations, sep, rgba, cmyk);
}

static fz_page *
gprf_load_page(fz_context *ctx, fz_document *doc_, int number)
{
	gprf_document *doc = (gprf_document*)doc_;
	gprf_page *page = fz_new_page(ctx, gprf_page);

	fz_try(ctx)
	{
		page->super.bound_page = gprf_bound_page;
		page->super.run_page_contents = gprf_run_page;
		page->super.drop_page = gprf_drop_page_imp;
		page->super.count_separations = gprf_count_separations;
		page->super.control_separation = gprf_control_separation;
		page->super.separation_disabled = gprf_separation_disabled;
		page->super.get_separation = gprf_get_separation;
		page->doc = (gprf_document *)fz_keep_document(ctx, &doc->super);
		page->number = number;
		page->separations = fz_new_separations(ctx);
		page->width = doc->page_dims[number].w;
		page->height = doc->page_dims[number].h;
		page->tile_width = (page->width + GPRF_TILESIZE-1)/GPRF_TILESIZE;
		page->tile_height = (page->height + GPRF_TILESIZE-1)/GPRF_TILESIZE;
	}
	fz_catch(ctx)
	{
		fz_drop_page(ctx, &page->super);
		fz_rethrow(ctx);
	}

	return (fz_page*)page;
}

static void
gprf_close_document(fz_context *ctx, fz_document *doc_)
{
	gprf_document *doc = (gprf_document*)doc_;

	fz_free(ctx, doc->page_dims);
	fz_free(ctx, doc->pdf_filename);
	fz_free(ctx, doc->gprf_filename);
	fz_free(ctx, doc->print_profile);
	fz_free(ctx, doc->display_profile);
}

static int
gprf_lookup_metadata(fz_context *ctx, fz_document *doc, const char *key, char *buf, int size)
{
	if (!strcmp(key, "format"))
		return (int)fz_snprintf(buf, size, "GPROOF");

	return -1;
}

static fz_document *
gprf_open_document_with_stream(fz_context *ctx, fz_stream *file)
{
	gprf_document *doc;

	doc = fz_new_document(ctx, gprf_document);
	doc->super.drop_document = gprf_close_document;
	doc->super.count_pages = gprf_count_pages;
	doc->super.load_page = gprf_load_page;
	doc->super.lookup_metadata = gprf_lookup_metadata;

	fz_try(ctx)
	{
		int32_t val;
		int i;
		char buf[4096];

		val = fz_read_int32_le(ctx, file);
		if (val != 0x4f525047)
			fz_throw(ctx, FZ_ERROR_GENERIC, "Invalid file signature in gproof file");
		val = fz_read_byte(ctx, file);
		val |= fz_read_byte(ctx, file)<<8;
		if (val != 1)
			fz_throw(ctx, FZ_ERROR_GENERIC, "Invalid version in gproof file");
		doc->res = fz_read_int32_le(ctx, file);
		if (doc->res < 0)
			fz_throw(ctx, FZ_ERROR_GENERIC, "Invalid resolution in gproof file");
		doc->num_pages = fz_read_int32_le(ctx, file);
		if (doc->num_pages < 0)
			fz_throw(ctx, FZ_ERROR_GENERIC, "Invalid resolution in gproof file");
		doc->page_dims = fz_calloc(ctx, doc->num_pages, sizeof(*doc->page_dims));

		for (i = 0; i < doc->num_pages; i++)
		{
			doc->page_dims[i].w = fz_read_int32_le(ctx, file);
			doc->page_dims[i].h = fz_read_int32_le(ctx, file);
		}
		fz_read_string(ctx, file, buf, sizeof(buf));
		doc->pdf_filename = fz_strdup(ctx, buf);
		fz_read_string(ctx, file, buf, sizeof(buf));
		doc->print_profile = fz_strdup(ctx, buf);
		fz_read_string(ctx, file, buf, sizeof(buf));
		doc->display_profile = fz_strdup(ctx, buf);
	}
	fz_catch(ctx)
	{
		fz_drop_document(ctx, &doc->super);
		fz_rethrow(ctx);
	}

	return (fz_document*)doc;
}

static fz_document *
gprf_open_document(fz_context *ctx, const char *filename)
{
	fz_stream *file = fz_open_file(ctx, filename);
	fz_document *doc;
	gprf_document *gdoc;

	fz_try(ctx)
	{
		doc = gprf_open_document_with_stream(ctx, file);
		gdoc = (gprf_document *)doc;
		gdoc->gprf_filename = fz_strdup(ctx,filename);
	}
	fz_always(ctx)
	{
		fz_drop_stream(ctx, file);
	}
	fz_catch(ctx)
	{
		fz_rethrow(ctx);
	}
	return doc;
}

static const char *gprf_extensions[] =
{
	"gproof",
	NULL
};

static const char *gprf_mimetypes[] =
{
	"application/x-ghostproof",
	NULL
};

fz_document_handler gprf_document_handler =
{
	NULL,
	gprf_open_document,
	gprf_open_document_with_stream,
	gprf_extensions,
	gprf_mimetypes
};
#endif