pdf_g4.c

Fri, 21 Feb 2003 10:49:11 +0000

author
eric
date
Fri, 21 Feb 2003 10:49:11 +0000
changeset 67
7add7411c1c2
parent 66
6e0551b59dba
child 73
6e306105c128
permissions
-rw-r--r--

changed pdf_calloc() to take two args like ordinary calloc(). added pdf_stream_write_bits() and pdf_stream_flush_bits().

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@67 7 * $Id: pdf_g4.c,v 1.6 2003/02/21 02:49:11 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@67 41 #define SWAP(type,a,b) do { type temp; temp = a; a = b; b = temp; } while (0)
eric@67 42
eric@67 43
eric@59 44 struct pdf_g4_image
eric@59 45 {
eric@64 46 double width, height;
eric@64 47 double x, y;
eric@66 48 double r, g, b; /* fill color, only for ImageMask */
eric@59 49 unsigned long Columns;
eric@59 50 unsigned long Rows;
eric@66 51 bool ImageMask;
eric@66 52 bool BlackIs1;
eric@62 53 Bitmap *bitmap;
eric@59 54 char XObject_name [4];
eric@59 55 };
eric@59 56
eric@59 57
eric@59 58 char pdf_new_XObject (pdf_page_handle pdf_page, struct pdf_obj *ind_ref)
eric@59 59 {
eric@59 60 char XObject_name [4] = "Im ";
eric@59 61
eric@59 62 XObject_name [2] = ++pdf_page->last_XObject_name;
eric@59 63
eric@59 64 if (! pdf_page->XObject_dict)
eric@59 65 {
eric@59 66 pdf_page->XObject_dict = pdf_new_obj (PT_DICTIONARY);
eric@59 67 pdf_set_dict_entry (pdf_page->resources, "XObject", pdf_page->XObject_dict);
eric@59 68 }
eric@59 69
eric@59 70 pdf_set_dict_entry (pdf_page->XObject_dict, & XObject_name [0], ind_ref);
eric@59 71
eric@59 72 return (pdf_page->last_XObject_name);
eric@59 73 }
eric@59 74
eric@59 75
eric@59 76 void pdf_write_g4_content_callback (pdf_file_handle pdf_file,
eric@59 77 struct pdf_obj *stream,
eric@59 78 void *app_data)
eric@59 79 {
eric@59 80 struct pdf_g4_image *image = app_data;
eric@59 81
eric@66 82 /* transformation matrix is: width 0 0 height x y cm */
eric@66 83 pdf_stream_printf (pdf_file, stream, "q %g 0 0 %g %g %g cm ",
eric@66 84 image->width, image->height,
eric@66 85 image->x, image->y);
eric@66 86 if (image->ImageMask)
eric@66 87 pdf_stream_printf (pdf_file, stream, "%g %g %g rg ",
eric@66 88 image->r, image->g, image->b);
eric@59 89
eric@66 90 pdf_stream_printf (pdf_file, stream, "/%s Do Q\r\n",
eric@66 91 image->XObject_name);
eric@59 92 }
eric@59 93
eric@59 94
eric@59 95 void pdf_write_g4_fax_image_callback (pdf_file_handle pdf_file,
eric@59 96 struct pdf_obj *stream,
eric@59 97 void *app_data)
eric@59 98 {
eric@59 99 struct pdf_g4_image *image = app_data;
eric@59 100
eric@67 101 uint32_t row;
eric@67 102
eric@67 103 /* reference (previous) row */
eric@67 104 uint32_t *ref_runs = pdf_calloc (image->Columns, sizeof (uint32_t));
eric@67 105 uint32_t ref_run_count;
eric@59 106
eric@67 107 /* row being converted */
eric@67 108 uint32_t *row_runs = pdf_calloc (image->Columns, sizeof (uint32_t));
eric@67 109 uint32_t row_run_count;
eric@67 110
eric@67 111 /* initialize reference row - all white */
eric@67 112 ref_runs [0] = image->Columns;
eric@67 113 ref_run_count = 0;
eric@59 114
eric@67 115 for (row = image->bitmap->rect.min.y;
eric@67 116 row < image->bitmap->rect.max.y;
eric@67 117 row++)
eric@59 118 {
eric@67 119 row_run_count = get_row_run_lengths (image->bitmap,
eric@67 120 row,
eric@67 121 image->bitmap->rect.min.x,
eric@67 122 image->bitmap->rect.max.x - 1,
eric@67 123 image->Columns, /* max_runs */
eric@67 124 row_runs);
eric@67 125 pdf_assert (row_run_count > 0);
eric@67 126
eric@67 127 /* $$$ G4 encode the runs here */
eric@59 128
eric@67 129 /* pdf_stream_write_data (pdf_file, stream, image->data, image->len); */
eric@67 130
eric@67 131 SWAP (uint32_t *, row_runs, ref_runs);
eric@67 132 ref_run_count = row_run_count;
eric@59 133 }
eric@67 134
eric@67 135
eric@59 136 /* $$$ generate and write EOFB code */
eric@67 137 pdf_stream_write_bits (pdf_file, stream, 24, 0x001001);
eric@67 138
eric@67 139 pdf_stream_flush_bits (pdf_file, stream);
eric@67 140
eric@67 141 free (ref_runs);
eric@67 142 free (row_runs);
eric@59 143 }
eric@59 144
eric@59 145
eric@59 146 void pdf_write_g4_fax_image (pdf_page_handle pdf_page,
eric@64 147 double x,
eric@64 148 double y,
eric@64 149 double width,
eric@64 150 double height,
eric@62 151 Bitmap *bitmap,
eric@66 152 bool ImageMask,
eric@66 153 double r, /* RGB fill color, only for ImageMask */
eric@66 154 double g,
eric@66 155 double b,
eric@66 156 bool BlackIs1) /* boolean, typ. false */
eric@59 157 {
eric@59 158 struct pdf_g4_image *image;
eric@59 159
eric@59 160 struct pdf_obj *stream;
eric@59 161 struct pdf_obj *stream_dict;
eric@59 162 struct pdf_obj *decode_parms;
eric@59 163
eric@59 164 struct pdf_obj *content_stream;
eric@59 165
eric@67 166 image = pdf_calloc (1, sizeof (struct pdf_g4_image));
eric@59 167
eric@64 168 image->width = width;
eric@64 169 image->height = height;
eric@64 170 image->x = x;
eric@64 171 image->y = y;
eric@66 172 image->r = r;
eric@66 173 image->g = g;
eric@66 174 image->b = b;
eric@64 175
eric@62 176 image->bitmap = bitmap;
eric@62 177 image->Columns = bitmap->rect.max.x - bitmap->rect.min.x;
eric@62 178 image->Rows = bitmap->rect.max.y - bitmap->rect.min.y;
eric@66 179 image->ImageMask = ImageMask;
eric@59 180 image->BlackIs1 = BlackIs1;
eric@59 181
eric@59 182 stream_dict = pdf_new_obj (PT_DICTIONARY);
eric@59 183
eric@59 184 stream = pdf_new_ind_ref (pdf_page->pdf_file,
eric@59 185 pdf_new_stream (pdf_page->pdf_file,
eric@59 186 stream_dict,
eric@59 187 & pdf_write_g4_fax_image_callback,
eric@59 188 image));
eric@59 189
eric@59 190 strcpy (& image->XObject_name [0], "Im ");
eric@59 191 image->XObject_name [2] = pdf_new_XObject (pdf_page, stream);
eric@59 192
eric@59 193 pdf_set_dict_entry (stream_dict, "Type", pdf_new_name ("XObject"));
eric@59 194 pdf_set_dict_entry (stream_dict, "Subtype", pdf_new_name ("Image"));
eric@59 195 pdf_set_dict_entry (stream_dict, "Name", pdf_new_name (& image->XObject_name [0]));
eric@62 196 pdf_set_dict_entry (stream_dict, "Width", pdf_new_integer (image->Columns));
eric@62 197 pdf_set_dict_entry (stream_dict, "Height", pdf_new_integer (image->Rows));
eric@59 198 pdf_set_dict_entry (stream_dict, "BitsPerComponent", pdf_new_integer (1));
eric@59 199 if (ImageMask)
eric@59 200 pdf_set_dict_entry (stream_dict, "ImageMask", pdf_new_bool (ImageMask));
eric@59 201 else
eric@59 202 pdf_set_dict_entry (stream_dict, "ColorSpace", pdf_new_name ("DeviceGray"));
eric@59 203
eric@59 204 decode_parms = pdf_new_obj (PT_DICTIONARY);
eric@59 205
eric@59 206 pdf_set_dict_entry (decode_parms,
eric@59 207 "K",
eric@59 208 pdf_new_integer (-1));
eric@59 209
eric@59 210 pdf_set_dict_entry (decode_parms,
eric@59 211 "Columns",
eric@62 212 pdf_new_integer (image->Columns));
eric@59 213
eric@59 214 pdf_set_dict_entry (decode_parms,
eric@59 215 "Rows",
eric@62 216 pdf_new_integer (image->Rows));
eric@59 217
eric@59 218 if (BlackIs1)
eric@59 219 pdf_set_dict_entry (decode_parms,
eric@59 220 "BlackIs1",
eric@59 221 pdf_new_bool (BlackIs1));
eric@59 222
eric@59 223 pdf_stream_add_filter (stream, "CCITTFaxDecode", decode_parms);
eric@59 224
eric@59 225 /* the following will write the stream, using our callback function to
eric@59 226 get the actual data */
eric@59 227 pdf_write_ind_obj (pdf_page->pdf_file, stream);
eric@59 228
eric@59 229 content_stream = pdf_new_ind_ref (pdf_page->pdf_file,
eric@59 230 pdf_new_stream (pdf_page->pdf_file,
eric@59 231 pdf_new_obj (PT_DICTIONARY),
eric@59 232 & pdf_write_g4_content_callback,
eric@59 233 image));
eric@59 234
eric@59 235 pdf_set_dict_entry (pdf_page->page_dict, "Contents", content_stream);
eric@59 236
eric@59 237 pdf_write_ind_obj (pdf_page->pdf_file, content_stream);
eric@59 238 }
eric@59 239