240 lines
6.7 KiB
C
240 lines
6.7 KiB
C
/*
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* t2p: Create a PDF file from the contents of one or more TIFF
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* bilevel image files. The images in the resulting PDF file
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* will be compressed using ITU-T T.6 (G4) fax encoding.
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*
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* PDF routines
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* $Id: pdf_g4.c,v 1.6 2003/02/21 02:49:11 eric Exp $
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* Copyright 2001, 2002, 2003 Eric Smith <eric@brouhaha.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation. Note that permission is
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* not granted to redistribute this program under the terms of any
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* other version of the General Public License.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
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*/
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "bitblt.h"
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#include "pdf.h"
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#include "pdf_util.h"
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#include "pdf_prim.h"
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#include "pdf_private.h"
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#define SWAP(type,a,b) do { type temp; temp = a; a = b; b = temp; } while (0)
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struct pdf_g4_image
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{
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double width, height;
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double x, y;
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double r, g, b; /* fill color, only for ImageMask */
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unsigned long Columns;
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unsigned long Rows;
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bool ImageMask;
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bool BlackIs1;
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Bitmap *bitmap;
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char XObject_name [4];
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};
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char pdf_new_XObject (pdf_page_handle pdf_page, struct pdf_obj *ind_ref)
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{
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char XObject_name [4] = "Im ";
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XObject_name [2] = ++pdf_page->last_XObject_name;
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if (! pdf_page->XObject_dict)
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{
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pdf_page->XObject_dict = pdf_new_obj (PT_DICTIONARY);
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pdf_set_dict_entry (pdf_page->resources, "XObject", pdf_page->XObject_dict);
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}
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pdf_set_dict_entry (pdf_page->XObject_dict, & XObject_name [0], ind_ref);
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return (pdf_page->last_XObject_name);
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}
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void pdf_write_g4_content_callback (pdf_file_handle pdf_file,
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struct pdf_obj *stream,
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void *app_data)
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{
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struct pdf_g4_image *image = app_data;
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/* transformation matrix is: width 0 0 height x y cm */
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pdf_stream_printf (pdf_file, stream, "q %g 0 0 %g %g %g cm ",
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image->width, image->height,
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image->x, image->y);
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if (image->ImageMask)
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pdf_stream_printf (pdf_file, stream, "%g %g %g rg ",
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image->r, image->g, image->b);
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pdf_stream_printf (pdf_file, stream, "/%s Do Q\r\n",
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image->XObject_name);
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}
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void pdf_write_g4_fax_image_callback (pdf_file_handle pdf_file,
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struct pdf_obj *stream,
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void *app_data)
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{
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struct pdf_g4_image *image = app_data;
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uint32_t row;
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/* reference (previous) row */
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uint32_t *ref_runs = pdf_calloc (image->Columns, sizeof (uint32_t));
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uint32_t ref_run_count;
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/* row being converted */
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uint32_t *row_runs = pdf_calloc (image->Columns, sizeof (uint32_t));
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uint32_t row_run_count;
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/* initialize reference row - all white */
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ref_runs [0] = image->Columns;
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ref_run_count = 0;
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for (row = image->bitmap->rect.min.y;
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row < image->bitmap->rect.max.y;
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row++)
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{
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row_run_count = get_row_run_lengths (image->bitmap,
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row,
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image->bitmap->rect.min.x,
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image->bitmap->rect.max.x - 1,
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image->Columns, /* max_runs */
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row_runs);
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pdf_assert (row_run_count > 0);
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/* $$$ G4 encode the runs here */
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/* pdf_stream_write_data (pdf_file, stream, image->data, image->len); */
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SWAP (uint32_t *, row_runs, ref_runs);
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ref_run_count = row_run_count;
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}
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/* $$$ generate and write EOFB code */
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pdf_stream_write_bits (pdf_file, stream, 24, 0x001001);
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pdf_stream_flush_bits (pdf_file, stream);
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free (ref_runs);
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free (row_runs);
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}
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void pdf_write_g4_fax_image (pdf_page_handle pdf_page,
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double x,
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double y,
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double width,
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double height,
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Bitmap *bitmap,
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bool ImageMask,
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double r, /* RGB fill color, only for ImageMask */
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double g,
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double b,
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bool BlackIs1) /* boolean, typ. false */
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{
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struct pdf_g4_image *image;
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struct pdf_obj *stream;
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struct pdf_obj *stream_dict;
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struct pdf_obj *decode_parms;
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struct pdf_obj *content_stream;
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image = pdf_calloc (1, sizeof (struct pdf_g4_image));
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image->width = width;
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image->height = height;
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image->x = x;
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image->y = y;
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image->r = r;
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image->g = g;
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image->b = b;
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image->bitmap = bitmap;
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image->Columns = bitmap->rect.max.x - bitmap->rect.min.x;
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image->Rows = bitmap->rect.max.y - bitmap->rect.min.y;
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image->ImageMask = ImageMask;
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image->BlackIs1 = BlackIs1;
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stream_dict = pdf_new_obj (PT_DICTIONARY);
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stream = pdf_new_ind_ref (pdf_page->pdf_file,
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pdf_new_stream (pdf_page->pdf_file,
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stream_dict,
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& pdf_write_g4_fax_image_callback,
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image));
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strcpy (& image->XObject_name [0], "Im ");
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image->XObject_name [2] = pdf_new_XObject (pdf_page, stream);
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pdf_set_dict_entry (stream_dict, "Type", pdf_new_name ("XObject"));
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pdf_set_dict_entry (stream_dict, "Subtype", pdf_new_name ("Image"));
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pdf_set_dict_entry (stream_dict, "Name", pdf_new_name (& image->XObject_name [0]));
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pdf_set_dict_entry (stream_dict, "Width", pdf_new_integer (image->Columns));
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pdf_set_dict_entry (stream_dict, "Height", pdf_new_integer (image->Rows));
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pdf_set_dict_entry (stream_dict, "BitsPerComponent", pdf_new_integer (1));
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if (ImageMask)
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pdf_set_dict_entry (stream_dict, "ImageMask", pdf_new_bool (ImageMask));
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else
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pdf_set_dict_entry (stream_dict, "ColorSpace", pdf_new_name ("DeviceGray"));
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decode_parms = pdf_new_obj (PT_DICTIONARY);
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pdf_set_dict_entry (decode_parms,
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"K",
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pdf_new_integer (-1));
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pdf_set_dict_entry (decode_parms,
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"Columns",
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pdf_new_integer (image->Columns));
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pdf_set_dict_entry (decode_parms,
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"Rows",
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pdf_new_integer (image->Rows));
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if (BlackIs1)
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pdf_set_dict_entry (decode_parms,
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"BlackIs1",
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pdf_new_bool (BlackIs1));
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pdf_stream_add_filter (stream, "CCITTFaxDecode", decode_parms);
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/* the following will write the stream, using our callback function to
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get the actual data */
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pdf_write_ind_obj (pdf_page->pdf_file, stream);
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content_stream = pdf_new_ind_ref (pdf_page->pdf_file,
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pdf_new_stream (pdf_page->pdf_file,
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pdf_new_obj (PT_DICTIONARY),
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& pdf_write_g4_content_callback,
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image));
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pdf_set_dict_entry (pdf_page->page_dict, "Contents", content_stream);
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pdf_write_ind_obj (pdf_page->pdf_file, content_stream);
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}
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