tumble: pdf_jpeg.c@e2ef1c2f9eca (annotated)

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pdf_jpeg.c@e2ef1c2f9eca (annotated)

pdf_jpeg.c

Thu, 13 Mar 2003 08:57:05 +0000

author: eric
date: Thu, 13 Mar 2003 08:57:05 +0000
changeset 125: e2ef1c2f9eca
parent 106: 311726c12122
child 139: ec2a06d8a2a6
permissions: -rw-r--r--

changed program name from t2p to tumble.

 /*
  * tumble: build a PDF file from image files
  *
  * PDF routines
  * $Id: pdf_jpeg.c,v 1.2 2003/03/13 00:57:05 eric Exp $
  * Copyright 2003 Eric Smith <eric@brouhaha.com>
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.  Note that permission is
  * not granted to redistribute this program under the terms of any
  * other version of the General Public License.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
  */
 #include <stdbool.h>
 #include <stdint.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
 #include "bitblt.h"
 #include "pdf.h"
 #include "pdf_util.h"
 #include "pdf_prim.h"
 #include "pdf_private.h"
 struct pdf_jpeg_image
 {
   double width, height;
   double x, y;
   FILE *f;
   unsigned long Columns;
   unsigned long Rows;
   char XObject_name [4];
 };
 static void pdf_write_jpeg_content_callback (pdf_file_handle pdf_file,
 					     struct pdf_obj *stream,
 					     void *app_data)
 {
   struct pdf_jpeg_image *image = app_data;
   /* transformation matrix is: width 0 0 height x y cm */
   pdf_stream_printf (pdf_file, stream, "q %g 0 0 %g %g %g cm ",
 		     image->width, image->height,
 		     image->x, image->y);
   pdf_stream_printf (pdf_file, stream, "/%s Do Q\r\n",
 		     image->XObject_name);
 }
 #define JPEG_BUFFER_SIZE 8192
 static void pdf_write_jpeg_image_callback (pdf_file_handle pdf_file,
 					   struct pdf_obj *stream,
 					   void *app_data)
 {
   struct pdf_jpeg_image *image = app_data;
   FILE *f;
   int rlen, wlen;
   uint8_t *wp;
   uint8_t buffer [8192];
   while (! feof (image->f))
     {
       rlen = fread (& buffer [0], 1, JPEG_BUFFER_SIZE, f);
       wp = & buffer [0];
       while (rlen)
 	{
 	  wlen = fwrite (wp, 1, rlen, pdf_file->f);
 	  if (feof (pdf_file->f))
 	    pdf_fatal ("unexpected EOF on output file\n");
 	  if (ferror (pdf_file->f))
 	    pdf_fatal ("error on output file\n");
 	  rlen -= wlen;
 	  wp += wlen;
 	}
       if (ferror (f))
 	pdf_fatal ("error on input file\n");
     }
 }
 void pdf_write_jpeg_image (pdf_page_handle pdf_page,
 			   double x,
 			   double y,
 			   double width,
 			   double height,
 			   FILE *f)
 {
   struct pdf_jpeg_image *image;
   struct pdf_obj *stream;
   struct pdf_obj *stream_dict;
   struct pdf_obj *decode_parms;
   struct pdf_obj *content_stream;
   image = pdf_calloc (1, sizeof (struct pdf_jpeg_image));
   image->width = width;
   image->height = height;
   image->x = x;
   image->y = y;
   image->f = f;
 #if 0
   image->Columns = bitmap->rect.max.x - bitmap->rect.min.x;
   image->Rows = bitmap->rect.max.y - bitmap->rect.min.y;
 #endif
   stream_dict = pdf_new_obj (PT_DICTIONARY);
   stream = pdf_new_ind_ref (pdf_page->pdf_file,
 			    pdf_new_stream (pdf_page->pdf_file,
 					    stream_dict,
 					    & pdf_write_jpeg_image_callback,
 					    image));
   strcpy (& image->XObject_name [0], "Im ");
   image->XObject_name [2] = pdf_new_XObject (pdf_page, stream);
   pdf_set_dict_entry (stream_dict, "Type",    pdf_new_name ("XObject"));
   pdf_set_dict_entry (stream_dict, "Subtype", pdf_new_name ("Image"));
   pdf_set_dict_entry (stream_dict, "Name",    pdf_new_name (& image->XObject_name [0]));
   pdf_set_dict_entry (stream_dict, "Width",   pdf_new_integer (image->Columns));
   pdf_set_dict_entry (stream_dict, "Height",  pdf_new_integer (image->Rows));
   pdf_set_dict_entry (stream_dict, "BitsPerComponent", pdf_new_integer (8));
   decode_parms = pdf_new_obj (PT_DICTIONARY);
   pdf_set_dict_entry (decode_parms,
 		      "K",
 		      pdf_new_integer (-1));
   pdf_set_dict_entry (decode_parms,
 		      "Columns",
 		      pdf_new_integer (image->Columns));
   pdf_set_dict_entry (decode_parms,
 		      "Rows",
 		      pdf_new_integer (image->Rows));
   pdf_stream_add_filter (stream, "DCTDecode", decode_parms);
   /* the following will write the stream, using our callback function to
      get the actual data */
   pdf_write_ind_obj (pdf_page->pdf_file, stream);
   content_stream = pdf_new_ind_ref (pdf_page->pdf_file,
 				    pdf_new_stream (pdf_page->pdf_file,
 						    pdf_new_obj (PT_DICTIONARY),
 						    & pdf_write_jpeg_content_callback,
 						    image));
   pdf_set_dict_entry (pdf_page->page_dict, "Contents", content_stream);
   pdf_write_ind_obj (pdf_page->pdf_file, content_stream);
 }

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pdf_jpeg.c@e2ef1c2f9eca (annotated)

pdf_jpeg.c