Wed, 05 Mar 2003 20:39:50 +0000
added count field to struct pdf_bookmark.
1 /*
2 * t2p: Create a PDF file from the contents of one or more TIFF
3 * bilevel image files. The images in the resulting PDF file
4 * will be compressed using ITU-T T.6 (G4) fax encoding.
5 *
6 * PDF routines
7 * $Id: bitblt_g4.c,v 1.7 2003/03/04 17:58:31 eric Exp $
8 * Copyright 2001, 2002, 2003 Eric Smith <eric@brouhaha.com>
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation. Note that permission is
13 * not granted to redistribute this program under the terms of any
14 * other version of the General Public License.
15 *
16 * This program is distributed in the hope that it will be useful,
17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 * GNU General Public License for more details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
24 */
27 #include <stdbool.h>
28 #include <stdint.h>
29 #include <stdio.h>
30 #include <stdlib.h>
31 #include <string.h>
34 #include "bitblt.h"
35 #include "pdf.h"
36 #include "pdf_util.h"
37 #include "pdf_prim.h"
38 #include "pdf_private.h"
41 #include "pdf_g4_tables.h"
44 #define SWAP(type,a,b) do { type temp; temp = a; a = b; b = temp; } while (0)
47 struct pdf_g4_image
48 {
49 double width, height;
50 double x, y;
51 double r, g, b; /* fill color, only for ImageMask */
52 unsigned long Columns;
53 unsigned long Rows;
54 bool ImageMask;
55 bool BlackIs1;
56 Bitmap *bitmap;
57 char XObject_name [4];
58 };
61 char pdf_new_XObject (pdf_page_handle pdf_page, struct pdf_obj *ind_ref)
62 {
63 char XObject_name [4] = "Im ";
65 XObject_name [2] = ++pdf_page->last_XObject_name;
67 if (! pdf_page->XObject_dict)
68 {
69 pdf_page->XObject_dict = pdf_new_obj (PT_DICTIONARY);
70 pdf_set_dict_entry (pdf_page->resources, "XObject", pdf_page->XObject_dict);
71 }
73 pdf_set_dict_entry (pdf_page->XObject_dict, & XObject_name [0], ind_ref);
75 return (pdf_page->last_XObject_name);
76 }
79 void pdf_write_g4_content_callback (pdf_file_handle pdf_file,
80 struct pdf_obj *stream,
81 void *app_data)
82 {
83 struct pdf_g4_image *image = app_data;
85 /* transformation matrix is: width 0 0 height x y cm */
86 pdf_stream_printf (pdf_file, stream, "q %g 0 0 %g %g %g cm ",
87 image->width, image->height,
88 image->x, image->y);
89 if (image->ImageMask)
90 pdf_stream_printf (pdf_file, stream, "%g %g %g rg ",
91 image->r, image->g, image->b);
93 pdf_stream_printf (pdf_file, stream, "/%s Do Q\r\n",
94 image->XObject_name);
95 }
98 static void pdf_g4_encode_horizontal_run (pdf_file_handle pdf_file,
99 struct pdf_obj *stream,
100 bool black,
101 uint32_t run_length)
102 {
103 uint32_t i;
105 while (run_length >= 2560)
106 {
107 pdf_stream_write_bits (pdf_file, stream, 12, 0x01f);
108 run_length -= 2560;
109 }
111 if (run_length >= 1792)
112 {
113 i = (run_length - 1792) >> 6;
114 pdf_stream_write_bits (pdf_file, stream,
115 g4_long_makeup_code [i].count,
116 g4_long_makeup_code [i].bits);
117 run_length -= (1792 + (i << 6));
118 }
119 else if (run_length >= 64)
120 {
121 i = (run_length >> 6) - 1;
122 pdf_stream_write_bits (pdf_file, stream,
123 g4_makeup_code [black] [i].count,
124 g4_makeup_code [black] [i].bits);
125 run_length -= (i + 1) << 6;
126 }
128 pdf_stream_write_bits (pdf_file, stream,
129 g4_h_code [black] [run_length].count,
130 g4_h_code [black] [run_length].bits);
131 }
134 uint32_t find_transition (uint8_t *data,
135 uint32_t pos,
136 uint32_t width)
137 {
138 if (! data)
139 return (width);
140 return (0); /* $$$ */
141 }
144 static void pdf_g4_encode_row (pdf_file_handle pdf_file,
145 struct pdf_obj *stream,
146 uint32_t width,
147 uint8_t *ref,
148 uint8_t *row)
149 {
150 int a0, a1, a2;
151 int b1, b2;
153 a0 = -1;
155 while (a0 < width)
156 {
157 /* find a1, a2 */
158 a1 = find_transition (row, a0, width);
159 a2 = find_transition (row, a1, width);
161 /* find b1, b2 */
162 b1 = find_transition (ref, a0, width);
163 if (0) /* $$$ b1 color = a0 color */
164 b1 = find_transition (ref, b1, width);
165 b2 = find_transition (ref, b2, width);
167 if (b2 < a1)
168 {
169 /* pass mode - 0001 */
170 pdf_stream_write_bits (pdf_file, stream, 4, 0x1);
171 a0 = b2;
172 }
173 else if (abs (a1 - b1) <= 3)
174 {
175 /* vertical mode */
176 pdf_stream_write_bits (pdf_file, stream,
177 g4_vert_code [3 + a1 - b1].count,
178 g4_vert_code [3 + a1 - b1].bits);
179 a0 = a1;
180 }
181 else
182 {
183 /* horizontal mode - 001 */
184 pdf_stream_write_bits (pdf_file, stream, 3, 0x1);
185 pdf_g4_encode_horizontal_run (pdf_file, stream,
186 0 /* $$$ color (a0) */, a1 - a0);
187 pdf_g4_encode_horizontal_run (pdf_file, stream,
188 1 /* $$$ color (a1) */, a2 - a1);
189 a0 = a2;
190 }
191 }
192 }
195 void pdf_write_g4_fax_image_callback (pdf_file_handle pdf_file,
196 struct pdf_obj *stream,
197 void *app_data)
198 {
199 struct pdf_g4_image *image = app_data;
201 uint32_t row;
203 word_type *ref_line = NULL; /* reference (previous) row */
204 word_type *line = image->bitmap->bits;
206 for (row = image->bitmap->rect.min.y;
207 row < image->bitmap->rect.max.y;
208 row++)
209 {
210 pdf_g4_encode_row (pdf_file, stream, image->Columns,
211 (uint8_t *) ref_line,
212 (uint8_t *) line);
213 ref_line = line;
214 line += image->bitmap->row_words;
215 }
218 /* write EOFB code */
219 pdf_stream_write_bits (pdf_file, stream, 24, 0x001001);
221 pdf_stream_flush_bits (pdf_file, stream);
222 }
225 void pdf_write_g4_fax_image (pdf_page_handle pdf_page,
226 double x,
227 double y,
228 double width,
229 double height,
230 Bitmap *bitmap,
231 bool ImageMask,
232 double r, /* RGB fill color, only for ImageMask */
233 double g,
234 double b,
235 bool BlackIs1) /* boolean, typ. false */
236 {
237 struct pdf_g4_image *image;
239 struct pdf_obj *stream;
240 struct pdf_obj *stream_dict;
241 struct pdf_obj *decode_parms;
243 struct pdf_obj *content_stream;
245 image = pdf_calloc (1, sizeof (struct pdf_g4_image));
247 image->width = width;
248 image->height = height;
249 image->x = x;
250 image->y = y;
251 image->r = r;
252 image->g = g;
253 image->b = b;
255 image->bitmap = bitmap;
256 image->Columns = bitmap->rect.max.x - bitmap->rect.min.x;
257 image->Rows = bitmap->rect.max.y - bitmap->rect.min.y;
258 image->ImageMask = ImageMask;
259 image->BlackIs1 = BlackIs1;
261 stream_dict = pdf_new_obj (PT_DICTIONARY);
263 stream = pdf_new_ind_ref (pdf_page->pdf_file,
264 pdf_new_stream (pdf_page->pdf_file,
265 stream_dict,
266 & pdf_write_g4_fax_image_callback,
267 image));
269 strcpy (& image->XObject_name [0], "Im ");
270 image->XObject_name [2] = pdf_new_XObject (pdf_page, stream);
272 pdf_set_dict_entry (stream_dict, "Type", pdf_new_name ("XObject"));
273 pdf_set_dict_entry (stream_dict, "Subtype", pdf_new_name ("Image"));
274 pdf_set_dict_entry (stream_dict, "Name", pdf_new_name (& image->XObject_name [0]));
275 pdf_set_dict_entry (stream_dict, "Width", pdf_new_integer (image->Columns));
276 pdf_set_dict_entry (stream_dict, "Height", pdf_new_integer (image->Rows));
277 pdf_set_dict_entry (stream_dict, "BitsPerComponent", pdf_new_integer (1));
278 if (ImageMask)
279 pdf_set_dict_entry (stream_dict, "ImageMask", pdf_new_bool (ImageMask));
280 else
281 pdf_set_dict_entry (stream_dict, "ColorSpace", pdf_new_name ("DeviceGray"));
283 decode_parms = pdf_new_obj (PT_DICTIONARY);
285 pdf_set_dict_entry (decode_parms,
286 "K",
287 pdf_new_integer (-1));
289 pdf_set_dict_entry (decode_parms,
290 "Columns",
291 pdf_new_integer (image->Columns));
293 pdf_set_dict_entry (decode_parms,
294 "Rows",
295 pdf_new_integer (image->Rows));
297 if (BlackIs1)
298 pdf_set_dict_entry (decode_parms,
299 "BlackIs1",
300 pdf_new_bool (BlackIs1));
302 pdf_stream_add_filter (stream, "CCITTFaxDecode", decode_parms);
304 /* the following will write the stream, using our callback function to
305 get the actual data */
306 pdf_write_ind_obj (pdf_page->pdf_file, stream);
308 content_stream = pdf_new_ind_ref (pdf_page->pdf_file,
309 pdf_new_stream (pdf_page->pdf_file,
310 pdf_new_obj (PT_DICTIONARY),
311 & pdf_write_g4_content_callback,
312 image));
314 pdf_set_dict_entry (pdf_page->page_dict, "Contents", content_stream);
316 pdf_write_ind_obj (pdf_page->pdf_file, content_stream);
317 }