Fri, 21 Feb 2003 09:12:05 +0000
*** empty log message ***
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 1.4 2003/02/21 01:01:33 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 <string.h>
33 #include "bitblt.h"
34 #include "pdf.h"
35 #include "pdf_util.h"
36 #include "pdf_prim.h"
37 #include "pdf_private.h"
40 struct pdf_g4_image
41 {
42 double width, height;
43 double x, y;
44 unsigned long Columns;
45 unsigned long Rows;
46 int BlackIs1;
47 Bitmap *bitmap;
48 char XObject_name [4];
49 };
52 char pdf_new_XObject (pdf_page_handle pdf_page, struct pdf_obj *ind_ref)
53 {
54 char XObject_name [4] = "Im ";
56 XObject_name [2] = ++pdf_page->last_XObject_name;
58 if (! pdf_page->XObject_dict)
59 {
60 pdf_page->XObject_dict = pdf_new_obj (PT_DICTIONARY);
61 pdf_set_dict_entry (pdf_page->resources, "XObject", pdf_page->XObject_dict);
62 }
64 pdf_set_dict_entry (pdf_page->XObject_dict, & XObject_name [0], ind_ref);
66 return (pdf_page->last_XObject_name);
67 }
70 void pdf_write_g4_content_callback (pdf_file_handle pdf_file,
71 struct pdf_obj *stream,
72 void *app_data)
73 {
74 struct pdf_g4_image *image = app_data;
76 char str1 [100];
77 char *str2 = "/";
78 char *str3 = " Do Q\r\n";
80 /* width 0 0 height x y cm */
81 sprintf (str1, "q %g 0 0 %g %g %g cm\r\n",
82 image->width, image->height,
83 image->x, image->y);
85 pdf_stream_write_data (pdf_file, stream, str1, strlen (str1));
86 pdf_stream_write_data (pdf_file, stream, str2, strlen (str2));
87 pdf_stream_write_data (pdf_file, stream, & image->XObject_name [0],
88 strlen (& image->XObject_name [0]));
89 pdf_stream_write_data (pdf_file, stream, str3, strlen (str3));
90 }
93 void pdf_write_g4_fax_image_callback (pdf_file_handle pdf_file,
94 struct pdf_obj *stream,
95 void *app_data)
96 {
97 struct pdf_g4_image *image = app_data;
99 #if 0
100 pdf_stream_write_data (pdf_file, stream, image->data, image->len);
101 #else
102 unsigned long row = 0;
103 word_type *ref;
104 word_type *raw;
106 ref = NULL;
107 raw = image->bitmap->bits;
109 while (row < image->Rows)
110 {
111 pdf_stream_write_data (pdf_file, stream, (uint8_t *) raw,
112 image->bitmap->row_words * sizeof (word_type));
114 row++;
115 ref = raw;
116 raw += image->bitmap->row_words;
117 }
118 /* $$$ generate and write EOFB code */
119 /* $$$ flush any remaining buffered bits */
120 #endif
121 }
124 void pdf_write_g4_fax_image (pdf_page_handle pdf_page,
125 double x,
126 double y,
127 double width,
128 double height,
129 Bitmap *bitmap,
130 int ImageMask,
131 int BlackIs1) /* boolean, typ. false */
132 {
133 struct pdf_g4_image *image;
135 struct pdf_obj *stream;
136 struct pdf_obj *stream_dict;
137 struct pdf_obj *decode_parms;
139 struct pdf_obj *content_stream;
141 image = pdf_calloc (sizeof (struct pdf_g4_image));
143 image->width = width;
144 image->height = height;
145 image->x = x;
146 image->y = y;
148 image->bitmap = bitmap;
149 image->Columns = bitmap->rect.max.x - bitmap->rect.min.x;
150 image->Rows = bitmap->rect.max.y - bitmap->rect.min.y;
151 image->BlackIs1 = BlackIs1;
153 stream_dict = pdf_new_obj (PT_DICTIONARY);
155 stream = pdf_new_ind_ref (pdf_page->pdf_file,
156 pdf_new_stream (pdf_page->pdf_file,
157 stream_dict,
158 & pdf_write_g4_fax_image_callback,
159 image));
161 strcpy (& image->XObject_name [0], "Im ");
162 image->XObject_name [2] = pdf_new_XObject (pdf_page, stream);
164 pdf_set_dict_entry (stream_dict, "Type", pdf_new_name ("XObject"));
165 pdf_set_dict_entry (stream_dict, "Subtype", pdf_new_name ("Image"));
166 pdf_set_dict_entry (stream_dict, "Name", pdf_new_name (& image->XObject_name [0]));
167 pdf_set_dict_entry (stream_dict, "Width", pdf_new_integer (image->Columns));
168 pdf_set_dict_entry (stream_dict, "Height", pdf_new_integer (image->Rows));
169 pdf_set_dict_entry (stream_dict, "BitsPerComponent", pdf_new_integer (1));
170 if (ImageMask)
171 pdf_set_dict_entry (stream_dict, "ImageMask", pdf_new_bool (ImageMask));
172 else
173 pdf_set_dict_entry (stream_dict, "ColorSpace", pdf_new_name ("DeviceGray"));
175 decode_parms = pdf_new_obj (PT_DICTIONARY);
177 pdf_set_dict_entry (decode_parms,
178 "K",
179 pdf_new_integer (-1));
181 pdf_set_dict_entry (decode_parms,
182 "Columns",
183 pdf_new_integer (image->Columns));
185 pdf_set_dict_entry (decode_parms,
186 "Rows",
187 pdf_new_integer (image->Rows));
189 if (BlackIs1)
190 pdf_set_dict_entry (decode_parms,
191 "BlackIs1",
192 pdf_new_bool (BlackIs1));
194 pdf_stream_add_filter (stream, "CCITTFaxDecode", decode_parms);
196 /* the following will write the stream, using our callback function to
197 get the actual data */
198 pdf_write_ind_obj (pdf_page->pdf_file, stream);
200 content_stream = pdf_new_ind_ref (pdf_page->pdf_file,
201 pdf_new_stream (pdf_page->pdf_file,
202 pdf_new_obj (PT_DICTIONARY),
203 & pdf_write_g4_content_callback,
204 image));
206 pdf_set_dict_entry (pdf_page->page_dict, "Contents", content_stream);
208 pdf_write_ind_obj (pdf_page->pdf_file, content_stream);
209 }