Mon, 14 Dec 2009 16:18:21 +0000
remove erroneous 0.33-philpem1 tag
1 /*
2 * tumble: build a PDF file from image files
3 *
4 * PDF routines
5 * Copyright 2004 Daniel Gloeckner
6 *
7 * Derived from pdf_jpeg.c written 2003 by Eric Smith <eric at brouhaha.com>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2 as
11 * published by the Free Software Foundation. Note that permission is
12 * not granted to redistribute this program under the terms of any
13 * other version of the General Public License.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA
23 */
26 #include <stdbool.h>
27 #include <stdint.h>
28 #include <stdio.h>
29 #include <stdlib.h>
30 #include <string.h>
33 #include "bitblt.h"
34 #include "pdf.h"
35 #include "pdf_util.h"
36 #include "pdf_prim.h"
37 #include "pdf_private.h"
40 struct pdf_png_image
41 {
42 double width, height;
43 double x, y;
44 bool color; /* false for grayscale */
45 uint32_t width_samples, height_samples;
46 FILE *f;
47 char XObject_name [4];
48 };
51 static void pdf_write_png_content_callback (pdf_file_handle pdf_file,
52 struct pdf_obj *stream,
53 void *app_data)
54 {
55 struct pdf_png_image *image = app_data;
57 /* transformation matrix is: width 0 0 height x y cm */
58 pdf_stream_printf (pdf_file, stream, "q %g 0 0 %g %g %g cm ",
59 image->width, image->height,
60 image->x, image->y);
61 pdf_stream_printf (pdf_file, stream, "/%s Do Q\r\n",
62 image->XObject_name);
63 }
66 static void pdf_write_png_image_callback (pdf_file_handle pdf_file,
67 struct pdf_obj *stream,
68 void *app_data)
69 {
70 struct pdf_png_image *image = app_data;
71 int rlen, wlen;
72 uint8_t *wp;
73 uint8_t buffer [8192];
75 while (! feof (image->f))
76 {
77 uint32_t clen;
78 rlen = fread (buffer, 1, 8, image->f);
79 if (rlen != 8)
80 pdf_fatal ("unexpected EOF on input file\n");
81 clen=(buffer[0]<<24)+(buffer[1]<<16)+(buffer[2]<<8)+buffer[3];
82 if (!memcmp(buffer+4,"IEND",4))
83 break;
84 if (memcmp(buffer+4,"IDAT",4)) {
85 fseek(image->f, clen+4, SEEK_CUR);
86 continue;
87 }
88 while (clen)
89 {
90 rlen = fread (buffer, 1, (clen<sizeof(buffer))?clen:sizeof(buffer), image->f);
91 if(!rlen)
92 pdf_fatal ("unexpected EOF on input file\n");
93 clen -= rlen;
94 wp = buffer;
95 while (rlen)
96 {
97 wlen = fwrite (wp, 1, rlen, pdf_file->f);
98 if (feof (pdf_file->f))
99 pdf_fatal ("unexpected EOF on output file\n");
100 if (ferror (pdf_file->f))
101 pdf_fatal ("error on output file\n");
102 rlen -= wlen;
103 wp += wlen;
104 }
105 if (ferror (image->f))
106 pdf_fatal ("error on input file\n");
107 }
108 fseek(image->f, 4, SEEK_CUR);
109 }
110 }
113 void pdf_write_png_image (pdf_page_handle pdf_page,
114 double x,
115 double y,
116 double width,
117 double height,
118 int color,
119 char *indexed,
120 int palent,
121 int bpp,
122 uint32_t width_samples,
123 uint32_t height_samples,
124 FILE *f)
125 {
126 struct pdf_png_image *image;
128 struct pdf_obj *stream;
129 struct pdf_obj *stream_dict;
130 struct pdf_obj *flateparams;
132 struct pdf_obj *content_stream;
134 image = pdf_calloc (1, sizeof (struct pdf_png_image));
136 image->width = width;
137 image->height = height;
138 image->x = x;
139 image->y = y;
141 image->f = f;
143 image->color = color;
144 image->width_samples = width_samples;
145 image->height_samples = height_samples;
147 pdf_add_array_elem_unique (pdf_page->procset,
148 pdf_new_name (palent ? "ImageI" : image->color ? "ImageC" : "ImageB"));
150 stream_dict = pdf_new_obj (PT_DICTIONARY);
152 stream = pdf_new_ind_ref (pdf_page->pdf_file,
153 pdf_new_stream (pdf_page->pdf_file,
154 stream_dict,
155 & pdf_write_png_image_callback,
156 image));
158 strcpy (& image->XObject_name [0], "Im ");
159 image->XObject_name [2] = pdf_new_XObject (pdf_page, stream);
161 flateparams = pdf_new_obj (PT_DICTIONARY);
163 pdf_set_dict_entry (stream_dict, "Type", pdf_new_name ("XObject"));
164 pdf_set_dict_entry (stream_dict, "Subtype", pdf_new_name ("Image"));
165 // Name is required in PDF 1.0 but obsoleted in later PDF versions
166 // pdf_set_dict_entry (stream_dict, "Name", pdf_new_name (& image->XObject_name [0]));
167 pdf_set_dict_entry (stream_dict, "Width", pdf_new_integer (image->width_samples));
168 pdf_set_dict_entry (flateparams, "Columns", pdf_new_integer (image->width_samples));
169 pdf_set_dict_entry (stream_dict, "Height", pdf_new_integer (image->height_samples));
170 if(palent) {
171 struct pdf_obj *space;
172 space = pdf_new_obj (PT_ARRAY);
173 pdf_add_array_elem (space, pdf_new_name ("Indexed"));
174 pdf_add_array_elem (space, pdf_new_name ("DeviceRGB"));
175 pdf_add_array_elem (space, pdf_new_integer (palent-1));
176 pdf_add_array_elem (space, pdf_new_string_n (indexed,3*palent));
177 pdf_set_dict_entry (stream_dict, "ColorSpace", space);
178 } else
179 pdf_set_dict_entry (stream_dict, "ColorSpace", pdf_new_name (image->color ? "DeviceRGB" : "DeviceGray"));
180 pdf_set_dict_entry (flateparams, "Colors", pdf_new_integer ((!indexed && image->color) ? 3 : 1));
181 pdf_set_dict_entry (stream_dict, "BitsPerComponent", pdf_new_integer (bpp));
182 pdf_set_dict_entry (flateparams, "BitsPerComponent", pdf_new_integer (bpp));
183 pdf_set_dict_entry (flateparams, "Predictor", pdf_new_integer (15));
185 pdf_stream_add_filter (stream, "FlateDecode", flateparams);
187 /* the following will write the stream, using our callback function to
188 get the actual data */
189 pdf_write_ind_obj (pdf_page->pdf_file, stream);
191 content_stream = pdf_new_ind_ref (pdf_page->pdf_file,
192 pdf_new_stream (pdf_page->pdf_file,
193 pdf_new_obj (PT_DICTIONARY),
194 & pdf_write_png_content_callback,
195 image));
197 pdf_set_dict_entry (pdf_page->page_dict, "Contents", content_stream);
199 pdf_write_ind_obj (pdf_page->pdf_file, content_stream);
200 }