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/****************************************************************************\
Part of the XeTeX typesetting system
copyright (c) 1994-2006 by SIL International
written by 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:
*/
#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;
}
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