1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/****************************************************************************\
Part of the XeTeX typesetting system
Copyright (c) 1994-2006 by SIL International
SIL Author(s): Jonathan Kew
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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 02111-1307 USA.
\****************************************************************************/
/* this file is derived from the dvipdfmx project;
the original header follows... */
/* $Header: /home/cvsroot/dvipdfmx/src/bmpimage.c,v 1.2 2004/07/27 12:08:46 hirata Exp $
This is dvipdfmx, an eXtended version of dvipdfm by Mark A. Wicks.
Copyright (C) 2002 by Jin-Hwan Cho and Shunsaku Hirata,
the dvipdfmx project team <dvipdfmx@project.ktug.or.kr>
Copyright (C) 1998, 1999 by Mark A. Wicks <mwicks@kettering.edu>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
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 02111-1307 USA.
*/
/*
* BMP SUPPORT:
*/
#if HAVE_CONFIG_H
#include <w2c/config.h>
#endif
#include "bmpimage.h"
#define DIB_FILE_HEADER_SIZE 14
#define DIB_CORE_HEADER_SIZE 14
#define DIB_INFO_HEADER_SIZE 40
#define DIB_COMPRESS_NONE 0
#define DIB_COMPRESS_RLE8 1
#define DIB_COMPRESS_RLE4 2
#define DIB_HEADER_SIZE_MAX (DIB_FILE_HEADER_SIZE+DIB_INFO_HEADER_SIZE)
static void
WARN(const char *fmt, ...)
{
va_list argp;
fprintf(stderr, "** WARNING ** ");
va_start(argp, fmt);
vfprintf(stderr, fmt, argp);
va_end(argp);
fprintf(stderr, "\n");
}
int
check_for_bmp (FILE *fp)
{
unsigned char sigbytes[2];
if (!fp)
return 0;
rewind(fp);
if (fread(sigbytes, 1, sizeof(sigbytes), fp) != sizeof(sigbytes) ||
sigbytes[0] != 'B' || sigbytes[1] != 'M')
return 0;
else
return 1;
return 0;
}
int
bmp_scan_file(struct bmp_info *info, FILE *fp)
{
unsigned char buf[DIB_HEADER_SIZE_MAX+4];
unsigned char *p;
long offset, fsize, hsize, compression;
long psize; /* Bytes per palette color: 3 for OS2, 4 for Win */
unsigned short bit_count; /* Bits per pix */
int num_palette, flip;
int i;
unsigned long biXPelsPerMeter, biYPelsPerMeter;
p = buf;
rewind(fp);
if (fread(buf, 1, DIB_FILE_HEADER_SIZE + 4, fp)
!= DIB_FILE_HEADER_SIZE + 4) {
WARN("Could not read BMP file header...");
}
if (p[0] != 'B' || p[1] != 'M') {
WARN("File not starting with \'B\' \'M\'... Not a BMP file?");
return -1;
}
p += 2;
#define ULONG_LE(b) ((b)[0] + ((b)[1] << 8) +\
((b)[2] << 16) + ((b)[3] << 24))
#define USHORT_LE(b) ((b)[0] + ((b)[1] << 8))
fsize = ULONG_LE(p); p += 4;
if (ULONG_LE(p) != 0) {
WARN("Not a BMP file???");
return -1;
}
p += 4;
offset = ULONG_LE(p); p += 4;
/* info header */
hsize = ULONG_LE(p); p += 4;
if (fread(p, sizeof(char), hsize - 4, fp) != hsize - 4) {
WARN("Could not read BMP file header...");
return -1;
}
flip = 1;
if (hsize == DIB_CORE_HEADER_SIZE) {
info->width = USHORT_LE(p); p += 2;
info->height = USHORT_LE(p); p += 2;
if (USHORT_LE(p) != 1) {
WARN("Unknown bcPlanes value in BMP COREHEADER.");
return -1;
}
p += 2;
bit_count = USHORT_LE(p); p += 2;
compression = DIB_COMPRESS_NONE;
psize = 3;
} else if (hsize == DIB_INFO_HEADER_SIZE) {
info->width = ULONG_LE(p); p += 4;
info->height = ULONG_LE(p); p += 4;
if (USHORT_LE(p) != 1) {
WARN("Unknown biPlanes value in BMP INFOHEADER.");
return -1;
}
p += 2;
bit_count = USHORT_LE(p); p += 2;
compression = ULONG_LE(p); p += 4;
/* ignore biSizeImage */ p += 4;
biXPelsPerMeter = ULONG_LE(p); p += 4;
biYPelsPerMeter = ULONG_LE(p); p += 4;
info->xdpi = biXPelsPerMeter * 0.0254; /* convert pixels per meter to DPI */
info->ydpi = biYPelsPerMeter * 0.0254;
if (info->height < 0) {
info->height = -info->height;
flip = 0;
}
psize = 4;
} else {
WARN("Unknown BMP header type.");
return -1;
}
if (bit_count < 24) {
if (bit_count != 1 &&
bit_count != 4 && bit_count != 8) {
WARN("Unsupported palette size: %ld", bit_count);
return -1;
}
num_palette = (offset - hsize - DIB_FILE_HEADER_SIZE) / psize;
info->bits_per_component = bit_count;
info->num_components = 1;
} else if (bit_count == 24) { /* full color */
num_palette = 1; /* dummy */
info->bits_per_component = 8;
info->num_components = 3;
} else {
WARN("Unkown BMP bitCount: %ld", bit_count);
return -1;
}
if (info->width == 0 || info->height == 0 || num_palette < 1) {
WARN("Invalid BMP file: width=%ld, height=%ld, #palette=%d",
info->width, info->height, num_palette);
return -1;
}
return 0;
}
|
