pdf_jpeg.c

Thu, 13 Mar 2003 07:59:10 +0000

author
eric
date
Thu, 13 Mar 2003 07:59:10 +0000
changeset 121
e50c7f76f2f6
parent 106
311726c12122
child 125
e2ef1c2f9eca
permissions
-rw-r--r--

don't use page mode USE_OUTLINES if there are no outline entries.

     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: pdf_jpeg.c,v 1.1 2003/03/12 02:57:06 eric Exp $
     8  * Copyright 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 struct pdf_jpeg_image
    42 {
    43   double width, height;
    44   double x, y;
    45   FILE *f;
    46   unsigned long Columns;
    47   unsigned long Rows;
    48   char XObject_name [4];
    49 };
    52 static void pdf_write_jpeg_content_callback (pdf_file_handle pdf_file,
    53 					     struct pdf_obj *stream,
    54 					     void *app_data)
    55 {
    56   struct pdf_jpeg_image *image = app_data;
    58   /* transformation matrix is: width 0 0 height x y cm */
    59   pdf_stream_printf (pdf_file, stream, "q %g 0 0 %g %g %g cm ",
    60 		     image->width, image->height,
    61 		     image->x, image->y);
    62   pdf_stream_printf (pdf_file, stream, "/%s Do Q\r\n",
    63 		     image->XObject_name);
    64 }
    67 #define JPEG_BUFFER_SIZE 8192
    69 static void pdf_write_jpeg_image_callback (pdf_file_handle pdf_file,
    70 					   struct pdf_obj *stream,
    71 					   void *app_data)
    72 {
    73   struct pdf_jpeg_image *image = app_data;
    74   FILE *f;
    75   int rlen, wlen;
    76   uint8_t *wp;
    77   uint8_t buffer [8192];
    79   while (! feof (image->f))
    80     {
    81       rlen = fread (& buffer [0], 1, JPEG_BUFFER_SIZE, f);
    82       wp = & buffer [0];
    83       while (rlen)
    84 	{
    85 	  wlen = fwrite (wp, 1, rlen, pdf_file->f);
    86 	  if (feof (pdf_file->f))
    87 	    pdf_fatal ("unexpected EOF on output file\n");
    88 	  if (ferror (pdf_file->f))
    89 	    pdf_fatal ("error on output file\n");
    90 	  rlen -= wlen;
    91 	  wp += wlen;
    92 	}
    93       if (ferror (f))
    94 	pdf_fatal ("error on input file\n");
    95     }
    96 }
    99 void pdf_write_jpeg_image (pdf_page_handle pdf_page,
   100 			   double x,
   101 			   double y,
   102 			   double width,
   103 			   double height,
   104 			   FILE *f)
   105 {
   106   struct pdf_jpeg_image *image;
   108   struct pdf_obj *stream;
   109   struct pdf_obj *stream_dict;
   110   struct pdf_obj *decode_parms;
   112   struct pdf_obj *content_stream;
   114   image = pdf_calloc (1, sizeof (struct pdf_jpeg_image));
   116   image->width = width;
   117   image->height = height;
   118   image->x = x;
   119   image->y = y;
   121   image->f = f;
   122 #if 0
   123   image->Columns = bitmap->rect.max.x - bitmap->rect.min.x;
   124   image->Rows = bitmap->rect.max.y - bitmap->rect.min.y;
   125 #endif
   127   stream_dict = pdf_new_obj (PT_DICTIONARY);
   129   stream = pdf_new_ind_ref (pdf_page->pdf_file,
   130 			    pdf_new_stream (pdf_page->pdf_file,
   131 					    stream_dict,
   132 					    & pdf_write_jpeg_image_callback,
   133 					    image));
   135   strcpy (& image->XObject_name [0], "Im ");
   136   image->XObject_name [2] = pdf_new_XObject (pdf_page, stream);
   138   pdf_set_dict_entry (stream_dict, "Type",    pdf_new_name ("XObject"));
   139   pdf_set_dict_entry (stream_dict, "Subtype", pdf_new_name ("Image"));
   140   pdf_set_dict_entry (stream_dict, "Name",    pdf_new_name (& image->XObject_name [0]));
   141   pdf_set_dict_entry (stream_dict, "Width",   pdf_new_integer (image->Columns));
   142   pdf_set_dict_entry (stream_dict, "Height",  pdf_new_integer (image->Rows));
   143   pdf_set_dict_entry (stream_dict, "BitsPerComponent", pdf_new_integer (8));
   145   decode_parms = pdf_new_obj (PT_DICTIONARY);
   147   pdf_set_dict_entry (decode_parms,
   148 		      "K",
   149 		      pdf_new_integer (-1));
   151   pdf_set_dict_entry (decode_parms,
   152 		      "Columns",
   153 		      pdf_new_integer (image->Columns));
   155   pdf_set_dict_entry (decode_parms,
   156 		      "Rows",
   157 		      pdf_new_integer (image->Rows));
   159   pdf_stream_add_filter (stream, "DCTDecode", decode_parms);
   161   /* the following will write the stream, using our callback function to
   162      get the actual data */
   163   pdf_write_ind_obj (pdf_page->pdf_file, stream);
   165   content_stream = pdf_new_ind_ref (pdf_page->pdf_file,
   166 				    pdf_new_stream (pdf_page->pdf_file,
   167 						    pdf_new_obj (PT_DICTIONARY),
   168 						    & pdf_write_jpeg_content_callback,
   169 						    image));
   171   pdf_set_dict_entry (pdf_page->page_dict, "Contents", content_stream);
   173   pdf_write_ind_obj (pdf_page->pdf_file, content_stream);
   174 }