221 lines
6.4 KiB
C
221 lines
6.4 KiB
C
/*
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* tumble: build a PDF file from image files
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*
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* PDF routines
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* $Id: pdf_g4.c,v 1.16 2003/03/19 23:44:53 eric Exp $
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* Copyright 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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* 2008-12-30 [JDB] Fixed bug wherein "pdf_write_g4_content_callback" called
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* "pdf_stream_printf" to write XObject name without escaping
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* restricted characters. Now calls "pdf_write_name".
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*
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* 2010-09-02 [JDB] Added support for min-is-black TIFF images.
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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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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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unsigned long Columns;
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unsigned long Rows;
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Bitmap *bitmap;
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char XObject_name [4];
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};
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static 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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pdf_write_name (pdf_file, image->XObject_name);
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pdf_stream_printf (pdf_file, stream, "Do Q\r\n");
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}
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static 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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bitblt_write_g4 (image->bitmap, pdf_file->f);
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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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bool negative,
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Bitmap *bitmap,
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colormap_t *colormap,
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rgb_range_t *transparency)
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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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struct pdf_obj *contents;
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struct pdf_obj *mask;
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typedef char MAP_STRING[6];
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MAP_STRING color_index;
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static MAP_STRING last_color_index;
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static struct pdf_obj *color_space;
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pdf_add_array_elem_unique (pdf_page->procset, pdf_new_name ("ImageB"));
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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->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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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 (transparency)
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{
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mask = pdf_new_obj (PT_ARRAY);
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pdf_add_array_elem (mask, pdf_new_integer (transparency->red.first));
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pdf_add_array_elem (mask, pdf_new_integer (transparency->red.last));
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pdf_set_dict_entry (stream_dict, "Mask", mask);
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}
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if (colormap)
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{
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color_index [0] = (char) colormap->black_map.red;
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color_index [1] = (char) colormap->black_map.green;
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color_index [2] = (char) colormap->black_map.blue;
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color_index [3] = (char) colormap->white_map.red;
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color_index [4] = (char) colormap->white_map.green;
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color_index [5] = (char) colormap->white_map.blue;
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if ((color_space == NULL) ||
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(memcmp (color_index, last_color_index, sizeof (MAP_STRING)) != 0))
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{
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memcpy (last_color_index, color_index, sizeof (MAP_STRING));
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color_space = pdf_new_obj (PT_ARRAY);
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pdf_add_array_elem (color_space, pdf_new_name ("Indexed"));
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pdf_add_array_elem (color_space, pdf_new_name ("DeviceRGB"));
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pdf_add_array_elem (color_space, pdf_new_integer (1));
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pdf_add_array_elem (color_space, pdf_new_string_n (color_index, 6));
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color_space = pdf_new_ind_ref (pdf_page->pdf_file, color_space);
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}
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pdf_set_dict_entry (stream_dict, "ColorSpace", color_space);
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}
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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 (negative)
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pdf_set_dict_entry (decode_parms,
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"BlackIs1",
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pdf_new_bool (true));
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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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contents = pdf_get_dict_entry (pdf_page->page_dict, "Contents");
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if (! contents)
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contents = pdf_new_obj (PT_ARRAY);
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pdf_add_array_elem (contents, content_stream);
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pdf_set_dict_entry (pdf_page->page_dict, "Contents", contents);
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pdf_write_ind_obj (pdf_page->pdf_file, content_stream);
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}
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