bitblt_g4.c

Wed, 05 Mar 2003 01:58:31 +0000

author
eric
date
Wed, 05 Mar 2003 01:58:31 +0000
changeset 73
6e306105c128
parent 67
7add7411c1c2
child 78
74b6b230f85d
permissions
-rw-r--r--

*** empty log message ***

eric@62 1 /*
eric@62 2 * t2p: Create a PDF file from the contents of one or more TIFF
eric@62 3 * bilevel image files. The images in the resulting PDF file
eric@62 4 * will be compressed using ITU-T T.6 (G4) fax encoding.
eric@62 5 *
eric@62 6 * PDF routines
eric@73 7 * $Id: bitblt_g4.c,v 1.7 2003/03/04 17:58:31 eric Exp $
eric@62 8 * Copyright 2001, 2002, 2003 Eric Smith <eric@brouhaha.com>
eric@62 9 *
eric@62 10 * This program is free software; you can redistribute it and/or modify
eric@62 11 * it under the terms of the GNU General Public License version 2 as
eric@62 12 * published by the Free Software Foundation. Note that permission is
eric@62 13 * not granted to redistribute this program under the terms of any
eric@62 14 * other version of the General Public License.
eric@62 15 *
eric@62 16 * This program is distributed in the hope that it will be useful,
eric@62 17 * but WITHOUT ANY WARRANTY; without even the implied warranty of
eric@62 18 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
eric@62 19 * GNU General Public License for more details.
eric@62 20 *
eric@62 21 * You should have received a copy of the GNU General Public License
eric@62 22 * along with this program; if not, write to the Free Software
eric@62 23 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
eric@62 24 */
eric@62 25
eric@62 26
eric@62 27 #include <stdbool.h>
eric@62 28 #include <stdint.h>
eric@59 29 #include <stdio.h>
eric@67 30 #include <stdlib.h>
eric@59 31 #include <string.h>
eric@59 32
eric@59 33
eric@62 34 #include "bitblt.h"
eric@60 35 #include "pdf.h"
eric@60 36 #include "pdf_util.h"
eric@60 37 #include "pdf_prim.h"
eric@60 38 #include "pdf_private.h"
eric@59 39
eric@59 40
eric@73 41 #include "pdf_g4_tables.h"
eric@73 42
eric@73 43
eric@67 44 #define SWAP(type,a,b) do { type temp; temp = a; a = b; b = temp; } while (0)
eric@67 45
eric@67 46
eric@59 47 struct pdf_g4_image
eric@59 48 {
eric@64 49 double width, height;
eric@64 50 double x, y;
eric@66 51 double r, g, b; /* fill color, only for ImageMask */
eric@59 52 unsigned long Columns;
eric@59 53 unsigned long Rows;
eric@66 54 bool ImageMask;
eric@66 55 bool BlackIs1;
eric@62 56 Bitmap *bitmap;
eric@59 57 char XObject_name [4];
eric@59 58 };
eric@59 59
eric@59 60
eric@59 61 char pdf_new_XObject (pdf_page_handle pdf_page, struct pdf_obj *ind_ref)
eric@59 62 {
eric@59 63 char XObject_name [4] = "Im ";
eric@59 64
eric@59 65 XObject_name [2] = ++pdf_page->last_XObject_name;
eric@59 66
eric@59 67 if (! pdf_page->XObject_dict)
eric@59 68 {
eric@59 69 pdf_page->XObject_dict = pdf_new_obj (PT_DICTIONARY);
eric@59 70 pdf_set_dict_entry (pdf_page->resources, "XObject", pdf_page->XObject_dict);
eric@59 71 }
eric@59 72
eric@59 73 pdf_set_dict_entry (pdf_page->XObject_dict, & XObject_name [0], ind_ref);
eric@59 74
eric@59 75 return (pdf_page->last_XObject_name);
eric@59 76 }
eric@59 77
eric@59 78
eric@59 79 void pdf_write_g4_content_callback (pdf_file_handle pdf_file,
eric@59 80 struct pdf_obj *stream,
eric@59 81 void *app_data)
eric@59 82 {
eric@59 83 struct pdf_g4_image *image = app_data;
eric@59 84
eric@66 85 /* transformation matrix is: width 0 0 height x y cm */
eric@66 86 pdf_stream_printf (pdf_file, stream, "q %g 0 0 %g %g %g cm ",
eric@66 87 image->width, image->height,
eric@66 88 image->x, image->y);
eric@66 89 if (image->ImageMask)
eric@66 90 pdf_stream_printf (pdf_file, stream, "%g %g %g rg ",
eric@66 91 image->r, image->g, image->b);
eric@59 92
eric@66 93 pdf_stream_printf (pdf_file, stream, "/%s Do Q\r\n",
eric@66 94 image->XObject_name);
eric@59 95 }
eric@59 96
eric@59 97
eric@73 98 static void pdf_g4_encode_horizontal_run (pdf_file_handle pdf_file,
eric@73 99 struct pdf_obj *stream,
eric@73 100 bool black,
eric@73 101 uint32_t run_length)
eric@73 102 {
eric@73 103 uint32_t i;
eric@73 104
eric@73 105 while (run_length >= 2560)
eric@73 106 {
eric@73 107 pdf_stream_write_bits (pdf_file, stream, 12, 0x01f);
eric@73 108 run_length -= 2560;
eric@73 109 }
eric@73 110
eric@73 111 if (run_length >= 1792)
eric@73 112 {
eric@73 113 i = (run_length - 1792) >> 6;
eric@73 114 pdf_stream_write_bits (pdf_file, stream,
eric@73 115 g4_long_makeup_code [i].count,
eric@73 116 g4_long_makeup_code [i].bits);
eric@73 117 run_length -= (1792 + (i << 6));
eric@73 118 }
eric@73 119 else if (run_length >= 64)
eric@73 120 {
eric@73 121 i = (run_length >> 6) - 1;
eric@73 122 pdf_stream_write_bits (pdf_file, stream,
eric@73 123 g4_makeup_code [black] [i].count,
eric@73 124 g4_makeup_code [black] [i].bits);
eric@73 125 run_length -= (i + 1) << 6;
eric@73 126 }
eric@73 127
eric@73 128 pdf_stream_write_bits (pdf_file, stream,
eric@73 129 g4_h_code [black] [run_length].count,
eric@73 130 g4_h_code [black] [run_length].bits);
eric@73 131 }
eric@73 132
eric@73 133
eric@73 134 uint32_t find_transition (uint8_t *data,
eric@73 135 uint32_t pos,
eric@73 136 uint32_t width)
eric@73 137 {
eric@73 138 if (! data)
eric@73 139 return (width);
eric@73 140 return (0); /* $$$ */
eric@73 141 }
eric@73 142
eric@73 143
eric@73 144 static void pdf_g4_encode_row (pdf_file_handle pdf_file,
eric@73 145 struct pdf_obj *stream,
eric@73 146 uint32_t width,
eric@73 147 uint8_t *ref,
eric@73 148 uint8_t *row)
eric@73 149 {
eric@73 150 int a0, a1, a2;
eric@73 151 int b1, b2;
eric@73 152
eric@73 153 a0 = -1;
eric@73 154
eric@73 155 while (a0 < width)
eric@73 156 {
eric@73 157 /* find a1, a2 */
eric@73 158 a1 = find_transition (row, a0, width);
eric@73 159 a2 = find_transition (row, a1, width);
eric@73 160
eric@73 161 /* find b1, b2 */
eric@73 162 b1 = find_transition (ref, a0, width);
eric@73 163 if (0) /* $$$ b1 color = a0 color */
eric@73 164 b1 = find_transition (ref, b1, width);
eric@73 165 b2 = find_transition (ref, b2, width);
eric@73 166
eric@73 167 if (b2 < a1)
eric@73 168 {
eric@73 169 /* pass mode - 0001 */
eric@73 170 pdf_stream_write_bits (pdf_file, stream, 4, 0x1);
eric@73 171 a0 = b2;
eric@73 172 }
eric@73 173 else if (abs (a1 - b1) <= 3)
eric@73 174 {
eric@73 175 /* vertical mode */
eric@73 176 pdf_stream_write_bits (pdf_file, stream,
eric@73 177 g4_vert_code [3 + a1 - b1].count,
eric@73 178 g4_vert_code [3 + a1 - b1].bits);
eric@73 179 a0 = a1;
eric@73 180 }
eric@73 181 else
eric@73 182 {
eric@73 183 /* horizontal mode - 001 */
eric@73 184 pdf_stream_write_bits (pdf_file, stream, 3, 0x1);
eric@73 185 pdf_g4_encode_horizontal_run (pdf_file, stream,
eric@73 186 0 /* $$$ color (a0) */, a1 - a0);
eric@73 187 pdf_g4_encode_horizontal_run (pdf_file, stream,
eric@73 188 1 /* $$$ color (a1) */, a2 - a1);
eric@73 189 a0 = a2;
eric@73 190 }
eric@73 191 }
eric@73 192 }
eric@73 193
eric@73 194
eric@59 195 void pdf_write_g4_fax_image_callback (pdf_file_handle pdf_file,
eric@59 196 struct pdf_obj *stream,
eric@59 197 void *app_data)
eric@59 198 {
eric@59 199 struct pdf_g4_image *image = app_data;
eric@59 200
eric@67 201 uint32_t row;
eric@67 202
eric@73 203 word_type *ref_line = NULL; /* reference (previous) row */
eric@73 204 word_type *line = image->bitmap->bits;
eric@59 205
eric@67 206 for (row = image->bitmap->rect.min.y;
eric@67 207 row < image->bitmap->rect.max.y;
eric@67 208 row++)
eric@59 209 {
eric@73 210 pdf_g4_encode_row (pdf_file, stream, image->Columns,
eric@73 211 (uint8_t *) ref_line,
eric@73 212 (uint8_t *) line);
eric@73 213 ref_line = line;
eric@73 214 line += image->bitmap->row_words;
eric@59 215 }
eric@67 216
eric@67 217
eric@73 218 /* write EOFB code */
eric@67 219 pdf_stream_write_bits (pdf_file, stream, 24, 0x001001);
eric@67 220
eric@67 221 pdf_stream_flush_bits (pdf_file, stream);
eric@59 222 }
eric@59 223
eric@59 224
eric@59 225 void pdf_write_g4_fax_image (pdf_page_handle pdf_page,
eric@64 226 double x,
eric@64 227 double y,
eric@64 228 double width,
eric@64 229 double height,
eric@62 230 Bitmap *bitmap,
eric@66 231 bool ImageMask,
eric@66 232 double r, /* RGB fill color, only for ImageMask */
eric@66 233 double g,
eric@66 234 double b,
eric@66 235 bool BlackIs1) /* boolean, typ. false */
eric@59 236 {
eric@59 237 struct pdf_g4_image *image;
eric@59 238
eric@59 239 struct pdf_obj *stream;
eric@59 240 struct pdf_obj *stream_dict;
eric@59 241 struct pdf_obj *decode_parms;
eric@59 242
eric@59 243 struct pdf_obj *content_stream;
eric@59 244
eric@67 245 image = pdf_calloc (1, sizeof (struct pdf_g4_image));
eric@59 246
eric@64 247 image->width = width;
eric@64 248 image->height = height;
eric@64 249 image->x = x;
eric@64 250 image->y = y;
eric@66 251 image->r = r;
eric@66 252 image->g = g;
eric@66 253 image->b = b;
eric@64 254
eric@62 255 image->bitmap = bitmap;
eric@62 256 image->Columns = bitmap->rect.max.x - bitmap->rect.min.x;
eric@62 257 image->Rows = bitmap->rect.max.y - bitmap->rect.min.y;
eric@66 258 image->ImageMask = ImageMask;
eric@59 259 image->BlackIs1 = BlackIs1;
eric@59 260
eric@59 261 stream_dict = pdf_new_obj (PT_DICTIONARY);
eric@59 262
eric@59 263 stream = pdf_new_ind_ref (pdf_page->pdf_file,
eric@59 264 pdf_new_stream (pdf_page->pdf_file,
eric@59 265 stream_dict,
eric@59 266 & pdf_write_g4_fax_image_callback,
eric@59 267 image));
eric@59 268
eric@59 269 strcpy (& image->XObject_name [0], "Im ");
eric@59 270 image->XObject_name [2] = pdf_new_XObject (pdf_page, stream);
eric@59 271
eric@59 272 pdf_set_dict_entry (stream_dict, "Type", pdf_new_name ("XObject"));
eric@59 273 pdf_set_dict_entry (stream_dict, "Subtype", pdf_new_name ("Image"));
eric@59 274 pdf_set_dict_entry (stream_dict, "Name", pdf_new_name (& image->XObject_name [0]));
eric@62 275 pdf_set_dict_entry (stream_dict, "Width", pdf_new_integer (image->Columns));
eric@62 276 pdf_set_dict_entry (stream_dict, "Height", pdf_new_integer (image->Rows));
eric@59 277 pdf_set_dict_entry (stream_dict, "BitsPerComponent", pdf_new_integer (1));
eric@59 278 if (ImageMask)
eric@59 279 pdf_set_dict_entry (stream_dict, "ImageMask", pdf_new_bool (ImageMask));
eric@59 280 else
eric@59 281 pdf_set_dict_entry (stream_dict, "ColorSpace", pdf_new_name ("DeviceGray"));
eric@59 282
eric@59 283 decode_parms = pdf_new_obj (PT_DICTIONARY);
eric@59 284
eric@59 285 pdf_set_dict_entry (decode_parms,
eric@59 286 "K",
eric@59 287 pdf_new_integer (-1));
eric@59 288
eric@59 289 pdf_set_dict_entry (decode_parms,
eric@59 290 "Columns",
eric@62 291 pdf_new_integer (image->Columns));
eric@59 292
eric@59 293 pdf_set_dict_entry (decode_parms,
eric@59 294 "Rows",
eric@62 295 pdf_new_integer (image->Rows));
eric@59 296
eric@59 297 if (BlackIs1)
eric@59 298 pdf_set_dict_entry (decode_parms,
eric@59 299 "BlackIs1",
eric@59 300 pdf_new_bool (BlackIs1));
eric@59 301
eric@59 302 pdf_stream_add_filter (stream, "CCITTFaxDecode", decode_parms);
eric@59 303
eric@59 304 /* the following will write the stream, using our callback function to
eric@59 305 get the actual data */
eric@59 306 pdf_write_ind_obj (pdf_page->pdf_file, stream);
eric@59 307
eric@59 308 content_stream = pdf_new_ind_ref (pdf_page->pdf_file,
eric@59 309 pdf_new_stream (pdf_page->pdf_file,
eric@59 310 pdf_new_obj (PT_DICTIONARY),
eric@59 311 & pdf_write_g4_content_callback,
eric@59 312 image));
eric@59 313
eric@59 314 pdf_set_dict_entry (pdf_page->page_dict, "Contents", content_stream);
eric@59 315
eric@59 316 pdf_write_ind_obj (pdf_page->pdf_file, content_stream);
eric@59 317 }
eric@59 318