summaryrefslogtreecommitdiff
path: root/source/fitz/output-pwg.c
blob: 205966d36c93430f9c8f144404b17de3846fa07c (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
#include "mupdf/fitz.h"

void
fz_output_pwg_file_header(fz_context *ctx, fz_output *out)
{
	static const unsigned char pwgsig[4] = { 'R', 'a', 'S', '2' };

	/* Sync word */
	fz_write(ctx, out, pwgsig, 4);
}

static void
output_header(fz_context *ctx, fz_output *out, const fz_pwg_options *pwg, int xres, int yres, int w, int h, int bpp)
{
	static const char zero[64] = { 0 };
	int i;

	/* Page Header: */
	fz_write(ctx, out, pwg ? pwg->media_class : zero, 64);
	fz_write(ctx, out, pwg ? pwg->media_color : zero, 64);
	fz_write(ctx, out, pwg ? pwg->media_type : zero, 64);
	fz_write(ctx, out, pwg ? pwg->output_type : zero, 64);
	fz_write_int32be(ctx, out, pwg ? pwg->advance_distance : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->advance_media : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->collate : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->cut_media : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->duplex : 0);
	fz_write_int32be(ctx, out, xres);
	fz_write_int32be(ctx, out, yres);
	/* CUPS format says that 284->300 are supposed to be the bbox of the
	 * page in points. PWG says 'Reserved'. */
	for (i=284; i < 300; i += 4)
		fz_write(ctx, out, zero, 4);
	fz_write_int32be(ctx, out, pwg ? pwg->insert_sheet : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->jog : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->leading_edge : 0);
	/* CUPS format says that 312->320 are supposed to be the margins of
	 * the lower left hand edge of page in points. PWG says 'Reserved'. */
	for (i=312; i < 320; i += 4)
		fz_write(ctx, out, zero, 4);
	fz_write_int32be(ctx, out, pwg ? pwg->manual_feed : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->media_position : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->media_weight : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->mirror_print : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->negative_print : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->num_copies : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->orientation : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->output_face_up : 0);
	fz_write_int32be(ctx, out, w * 72/ xres);	/* Page size in points */
	fz_write_int32be(ctx, out, h * 72/ yres);
	fz_write_int32be(ctx, out, pwg ? pwg->separations : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->tray_switch : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->tumble : 0);
	fz_write_int32be(ctx, out, w); /* Page image in pixels */
	fz_write_int32be(ctx, out, h);
	fz_write_int32be(ctx, out, pwg ? pwg->media_type_num : 0);
	fz_write_int32be(ctx, out, bpp < 8 ? 1 : 8); /* Bits per color */
	fz_write_int32be(ctx, out, bpp); /* Bits per pixel */
	fz_write_int32be(ctx, out, (w * bpp + 7)/8); /* Bytes per line */
	fz_write_int32be(ctx, out, 0); /* Chunky pixels */
	switch (bpp)
	{
	case 1: fz_write_int32be(ctx, out, 3); /* Black */ break;
	case 8: fz_write_int32be(ctx, out, 18); /* Sgray */ break;
	case 24: fz_write_int32be(ctx, out, 19); /* Srgb */ break;
	case 32: fz_write_int32be(ctx, out, 6); /* Cmyk */ break;
	default: fz_throw(ctx, FZ_ERROR_GENERIC, "pixmap bpp must be 1, 8, 24 or 32 to write as pwg");
	}
	fz_write_int32be(ctx, out, pwg ? pwg->compression : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->row_count : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->row_feed : 0);
	fz_write_int32be(ctx, out, pwg ? pwg->row_step : 0);
	fz_write_int32be(ctx, out, bpp <= 8 ? 1 : 3); /* Num Colors */
	for (i=424; i < 452; i += 4)
		fz_write(ctx, out, zero, 4);
	fz_write_int32be(ctx, out, 1); /* TotalPageCount */
	fz_write_int32be(ctx, out, 1); /* CrossFeedTransform */
	fz_write_int32be(ctx, out, 1); /* FeedTransform */
	fz_write_int32be(ctx, out, 0); /* ImageBoxLeft */
	fz_write_int32be(ctx, out, 0); /* ImageBoxTop */
	fz_write_int32be(ctx, out, w); /* ImageBoxRight */
	fz_write_int32be(ctx, out, h); /* ImageBoxBottom */
	for (i=480; i < 1668; i += 4)
		fz_write(ctx, out, zero, 4);
	fz_write(ctx, out, pwg ? pwg->rendering_intent : zero, 64);
	fz_write(ctx, out, pwg ? pwg->page_size_name : zero, 64);
}

void
fz_output_pwg_page(fz_context *ctx, fz_output *out, const fz_pixmap *pixmap, const fz_pwg_options *pwg)
{
	unsigned char *sp;
	int y, x, sn, dn, ss;

	if (!out || !pixmap)
		return;

	if (pixmap->n != 1 && pixmap->n != 2 && pixmap->n != 4 && pixmap->n != 5)
		fz_throw(ctx, FZ_ERROR_GENERIC, "pixmap must be grayscale, rgb or cmyk to write as pwg");

	sn = pixmap->n;
	dn = pixmap->n;
	if (dn > 1)
		dn--;

	output_header(ctx, out, pwg, pixmap->xres, pixmap->yres, pixmap->w, pixmap->h, dn*8);

	/* Now output the actual bitmap, using a packbits like compression */
	sp = pixmap->samples;
	ss = pixmap->w * sn;
	y = 0;
	while (y < pixmap->h)
	{
		int yrep;

		assert(sp == pixmap->samples + y * ss);

		/* Count the number of times this line is repeated */
		for (yrep = 1; yrep < 256 && y+yrep < pixmap->h; yrep++)
		{
			if (memcmp(sp, sp + yrep * ss, ss) != 0)
				break;
		}
		fz_write_byte(ctx, out, yrep-1);

		/* Encode the line */
		x = 0;
		while (x < pixmap->w)
		{
			int d;

			assert(sp == pixmap->samples + y * ss + x * sn);

			/* How far do we have to look to find a repeated value? */
			for (d = 1; d < 128 && x+d < pixmap->w; d++)
			{
				if (memcmp(sp + (d-1)*sn, sp + d*sn, sn) == 0)
					break;
			}
			if (d == 1)
			{
				int xrep;

				/* We immediately have a repeat (or we've hit
				 * the end of the line). Count the number of
				 * times this value is repeated. */
				for (xrep = 1; xrep < 128 && x+xrep < pixmap->w; xrep++)
				{
					if (memcmp(sp, sp + xrep*sn, sn) != 0)
						break;
				}
				fz_write_byte(ctx, out, xrep-1);
				fz_write(ctx, out, sp, dn);
				sp += sn*xrep;
				x += xrep;
			}
			else
			{
				fz_write_byte(ctx, out, 257-d);
				x += d;
				while (d > 0)
				{
					fz_write(ctx, out, sp, dn);
					sp += sn;
					d--;
				}
			}
		}

		/* Move to the next line */
		sp += ss*(yrep-1);
		y += yrep;
	}
}

void
fz_output_pwg_bitmap_page(fz_context *ctx, fz_output *out, const fz_bitmap *bitmap, const fz_pwg_options *pwg)
{
	unsigned char *sp;
	int y, x, ss;
	int byte_width;

	if (!out || !bitmap)
		return;

	output_header(ctx, out, pwg, bitmap->xres, bitmap->yres, bitmap->w, bitmap->h, 1);

	/* Now output the actual bitmap, using a packbits like compression */
	sp = bitmap->samples;
	ss = bitmap->stride;
	byte_width = (bitmap->w+7)/8;
	y = 0;
	while (y < bitmap->h)
	{
		int yrep;

		assert(sp == bitmap->samples + y * ss);

		/* Count the number of times this line is repeated */
		for (yrep = 1; yrep < 256 && y+yrep < bitmap->h; yrep++)
		{
			if (memcmp(sp, sp + yrep * ss, byte_width) != 0)
				break;
		}
		fz_write_byte(ctx, out, yrep-1);

		/* Encode the line */
		x = 0;
		while (x < byte_width)
		{
			int d;

			assert(sp == bitmap->samples + y * ss + x);

			/* How far do we have to look to find a repeated value? */
			for (d = 1; d < 128 && x+d < byte_width; d++)
			{
				if (sp[d-1] == sp[d])
					break;
			}
			if (d == 1)
			{
				int xrep;

				/* We immediately have a repeat (or we've hit
				 * the end of the line). Count the number of
				 * times this value is repeated. */
				for (xrep = 1; xrep < 128 && x+xrep < byte_width; xrep++)
				{
					if (sp[0] != sp[xrep])
						break;
				}
				fz_write_byte(ctx, out, xrep-1);
				fz_write(ctx, out, sp, 1);
				sp += xrep;
				x += xrep;
			}
			else
			{
				fz_write_byte(ctx, out, 257-d);
				fz_write(ctx, out, sp, d);
				sp += d;
				x += d;
			}
		}

		/* Move to the next line */
		sp += ss*yrep - byte_width;
		y += yrep;
	}
}

void
fz_output_pwg(fz_context *ctx, fz_output *out, const fz_pixmap *pixmap, const fz_pwg_options *pwg)
{
	fz_output_pwg_file_header(ctx, out);
	fz_output_pwg_page(ctx, out, pixmap, pwg);
}

void
fz_write_pwg(fz_context *ctx, fz_pixmap *pixmap, char *filename, int append, const fz_pwg_options *pwg)
{
	FILE *fp;
	fz_output *out = NULL;

	fp = fz_fopen(filename, append ? "ab" : "wb");
	if (!fp)
	{
		fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open file '%s': %s", filename, strerror(errno));
	}

	fz_var(out);

	fz_try(ctx)
	{
		out = fz_new_output_with_file(ctx, fp, 1);
		if (!append)
			fz_output_pwg_file_header(ctx, out);
		fz_output_pwg_page(ctx, out, pixmap, pwg);
	}
	fz_always(ctx)
	{
		fz_drop_output(ctx, out);
	}
	fz_catch(ctx)
	{
		fz_rethrow(ctx);
	}
}

void
fz_write_pwg_bitmap(fz_context *ctx, fz_bitmap *bitmap, char *filename, int append, const fz_pwg_options *pwg)
{
	FILE *fp;
	fz_output *out = NULL;

	fp = fz_fopen(filename, append ? "ab" : "wb");
	if (!fp)
	{
		fz_throw(ctx, FZ_ERROR_GENERIC, "cannot open file '%s': %s", filename, strerror(errno));
	}

	fz_var(out);

	fz_try(ctx)
	{
		out = fz_new_output_with_file(ctx, fp, 1);
		if (!append)
			fz_output_pwg_file_header(ctx, out);
		fz_output_pwg_bitmap_page(ctx, out, bitmap, pwg);
	}
	fz_always(ctx)
	{
		fz_drop_output(ctx, out);
	}
	fz_catch(ctx)
	{
		fz_rethrow(ctx);
	}
}