pdf_g4.c

Fri, 21 Feb 2003 09:25:47 +0000

author
eric
date
Fri, 21 Feb 2003 09:25:47 +0000
changeset 66
6e0551b59dba
parent 64
151394412eba
child 67
7add7411c1c2
permissions
-rw-r--r--

implemented ImageMask fill color arguments to pdf_write_g4_fax_image().

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@66 7 * $Id: pdf_g4.c,v 1.5 2003/02/21 01:25:47 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@59 30 #include <string.h>
eric@59 31
eric@59 32
eric@62 33 #include "bitblt.h"
eric@60 34 #include "pdf.h"
eric@60 35 #include "pdf_util.h"
eric@60 36 #include "pdf_prim.h"
eric@60 37 #include "pdf_private.h"
eric@59 38
eric@59 39
eric@59 40 struct pdf_g4_image
eric@59 41 {
eric@64 42 double width, height;
eric@64 43 double x, y;
eric@66 44 double r, g, b; /* fill color, only for ImageMask */
eric@59 45 unsigned long Columns;
eric@59 46 unsigned long Rows;
eric@66 47 bool ImageMask;
eric@66 48 bool BlackIs1;
eric@62 49 Bitmap *bitmap;
eric@59 50 char XObject_name [4];
eric@59 51 };
eric@59 52
eric@59 53
eric@59 54 char pdf_new_XObject (pdf_page_handle pdf_page, struct pdf_obj *ind_ref)
eric@59 55 {
eric@59 56 char XObject_name [4] = "Im ";
eric@59 57
eric@59 58 XObject_name [2] = ++pdf_page->last_XObject_name;
eric@59 59
eric@59 60 if (! pdf_page->XObject_dict)
eric@59 61 {
eric@59 62 pdf_page->XObject_dict = pdf_new_obj (PT_DICTIONARY);
eric@59 63 pdf_set_dict_entry (pdf_page->resources, "XObject", pdf_page->XObject_dict);
eric@59 64 }
eric@59 65
eric@59 66 pdf_set_dict_entry (pdf_page->XObject_dict, & XObject_name [0], ind_ref);
eric@59 67
eric@59 68 return (pdf_page->last_XObject_name);
eric@59 69 }
eric@59 70
eric@59 71
eric@59 72 void pdf_write_g4_content_callback (pdf_file_handle pdf_file,
eric@59 73 struct pdf_obj *stream,
eric@59 74 void *app_data)
eric@59 75 {
eric@59 76 struct pdf_g4_image *image = app_data;
eric@59 77
eric@66 78 /* transformation matrix is: width 0 0 height x y cm */
eric@66 79 pdf_stream_printf (pdf_file, stream, "q %g 0 0 %g %g %g cm ",
eric@66 80 image->width, image->height,
eric@66 81 image->x, image->y);
eric@66 82 if (image->ImageMask)
eric@66 83 pdf_stream_printf (pdf_file, stream, "%g %g %g rg ",
eric@66 84 image->r, image->g, image->b);
eric@59 85
eric@66 86 pdf_stream_printf (pdf_file, stream, "/%s Do Q\r\n",
eric@66 87 image->XObject_name);
eric@59 88 }
eric@59 89
eric@59 90
eric@59 91 void pdf_write_g4_fax_image_callback (pdf_file_handle pdf_file,
eric@59 92 struct pdf_obj *stream,
eric@59 93 void *app_data)
eric@59 94 {
eric@59 95 struct pdf_g4_image *image = app_data;
eric@59 96
eric@62 97 #if 0
eric@59 98 pdf_stream_write_data (pdf_file, stream, image->data, image->len);
eric@59 99 #else
eric@59 100 unsigned long row = 0;
eric@62 101 word_type *ref;
eric@62 102 word_type *raw;
eric@59 103
eric@59 104 ref = NULL;
eric@62 105 raw = image->bitmap->bits;
eric@59 106
eric@59 107 while (row < image->Rows)
eric@59 108 {
eric@64 109 pdf_stream_write_data (pdf_file, stream, (uint8_t *) raw,
eric@62 110 image->bitmap->row_words * sizeof (word_type));
eric@59 111
eric@59 112 row++;
eric@59 113 ref = raw;
eric@62 114 raw += image->bitmap->row_words;
eric@59 115 }
eric@59 116 /* $$$ generate and write EOFB code */
eric@59 117 /* $$$ flush any remaining buffered bits */
eric@59 118 #endif
eric@59 119 }
eric@59 120
eric@59 121
eric@59 122 void pdf_write_g4_fax_image (pdf_page_handle pdf_page,
eric@64 123 double x,
eric@64 124 double y,
eric@64 125 double width,
eric@64 126 double height,
eric@62 127 Bitmap *bitmap,
eric@66 128 bool ImageMask,
eric@66 129 double r, /* RGB fill color, only for ImageMask */
eric@66 130 double g,
eric@66 131 double b,
eric@66 132 bool BlackIs1) /* boolean, typ. false */
eric@59 133 {
eric@59 134 struct pdf_g4_image *image;
eric@59 135
eric@59 136 struct pdf_obj *stream;
eric@59 137 struct pdf_obj *stream_dict;
eric@59 138 struct pdf_obj *decode_parms;
eric@59 139
eric@59 140 struct pdf_obj *content_stream;
eric@59 141
eric@59 142 image = pdf_calloc (sizeof (struct pdf_g4_image));
eric@59 143
eric@64 144 image->width = width;
eric@64 145 image->height = height;
eric@64 146 image->x = x;
eric@64 147 image->y = y;
eric@66 148 image->r = r;
eric@66 149 image->g = g;
eric@66 150 image->b = b;
eric@64 151
eric@62 152 image->bitmap = bitmap;
eric@62 153 image->Columns = bitmap->rect.max.x - bitmap->rect.min.x;
eric@62 154 image->Rows = bitmap->rect.max.y - bitmap->rect.min.y;
eric@66 155 image->ImageMask = ImageMask;
eric@59 156 image->BlackIs1 = BlackIs1;
eric@59 157
eric@59 158 stream_dict = pdf_new_obj (PT_DICTIONARY);
eric@59 159
eric@59 160 stream = pdf_new_ind_ref (pdf_page->pdf_file,
eric@59 161 pdf_new_stream (pdf_page->pdf_file,
eric@59 162 stream_dict,
eric@59 163 & pdf_write_g4_fax_image_callback,
eric@59 164 image));
eric@59 165
eric@59 166 strcpy (& image->XObject_name [0], "Im ");
eric@59 167 image->XObject_name [2] = pdf_new_XObject (pdf_page, stream);
eric@59 168
eric@59 169 pdf_set_dict_entry (stream_dict, "Type", pdf_new_name ("XObject"));
eric@59 170 pdf_set_dict_entry (stream_dict, "Subtype", pdf_new_name ("Image"));
eric@59 171 pdf_set_dict_entry (stream_dict, "Name", pdf_new_name (& image->XObject_name [0]));
eric@62 172 pdf_set_dict_entry (stream_dict, "Width", pdf_new_integer (image->Columns));
eric@62 173 pdf_set_dict_entry (stream_dict, "Height", pdf_new_integer (image->Rows));
eric@59 174 pdf_set_dict_entry (stream_dict, "BitsPerComponent", pdf_new_integer (1));
eric@59 175 if (ImageMask)
eric@59 176 pdf_set_dict_entry (stream_dict, "ImageMask", pdf_new_bool (ImageMask));
eric@59 177 else
eric@59 178 pdf_set_dict_entry (stream_dict, "ColorSpace", pdf_new_name ("DeviceGray"));
eric@59 179
eric@59 180 decode_parms = pdf_new_obj (PT_DICTIONARY);
eric@59 181
eric@59 182 pdf_set_dict_entry (decode_parms,
eric@59 183 "K",
eric@59 184 pdf_new_integer (-1));
eric@59 185
eric@59 186 pdf_set_dict_entry (decode_parms,
eric@59 187 "Columns",
eric@62 188 pdf_new_integer (image->Columns));
eric@59 189
eric@59 190 pdf_set_dict_entry (decode_parms,
eric@59 191 "Rows",
eric@62 192 pdf_new_integer (image->Rows));
eric@59 193
eric@59 194 if (BlackIs1)
eric@59 195 pdf_set_dict_entry (decode_parms,
eric@59 196 "BlackIs1",
eric@59 197 pdf_new_bool (BlackIs1));
eric@59 198
eric@59 199 pdf_stream_add_filter (stream, "CCITTFaxDecode", decode_parms);
eric@59 200
eric@59 201 /* the following will write the stream, using our callback function to
eric@59 202 get the actual data */
eric@59 203 pdf_write_ind_obj (pdf_page->pdf_file, stream);
eric@59 204
eric@59 205 content_stream = pdf_new_ind_ref (pdf_page->pdf_file,
eric@59 206 pdf_new_stream (pdf_page->pdf_file,
eric@59 207 pdf_new_obj (PT_DICTIONARY),
eric@59 208 & pdf_write_g4_content_callback,
eric@59 209 image));
eric@59 210
eric@59 211 pdf_set_dict_entry (pdf_page->page_dict, "Contents", content_stream);
eric@59 212
eric@59 213 pdf_write_ind_obj (pdf_page->pdf_file, content_stream);
eric@59 214 }
eric@59 215