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/*
*
* This file is part of the XForms library package.
*
* XForms is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as
* published by the Free Software Foundation; either version 2.1, or
* (at your option) any later version.
*
* XForms 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with XForms; see the file COPYING. If not, write to
* the Free Software Foundation, 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*
*/
/*
* $Id: image_genesis.c,v 1.0 2002/05/08 05:16:30 zhao Release $
*
*.
* This file is part of the XForms library package.
* Copyright (c) 1998-2002 By T.C. Zhao
* All rights reserved.
*.
*
* but genesis format. Eventually dicom will
* be supported
*/
#include "forms.h"
#include "flimage.h"
#include "flimage_int.h"
#define IMG_MAGIC 0x494d4746
typedef struct
{
int magic;
int hdr_len;
int width;
int height;
int depth;
int compress;
int windoww;
int windowl;
}
SPEC;
static int
GENESIS_identify(FILE * fp)
{
char buf[4];
fread(buf, 1, 4, fp);
rewind(fp);
return (buf[0] == 'I' && buf[1] == 'M' && buf[2] == 'G' && buf[3] == 'F');
}
static int
GENESIS_description(FL_IMAGE * im)
{
SPEC *sp = fl_calloc(1, sizeof(*sp));
FILE *fp = im->fpin;
im->io_spec = sp;
im->spec_size = sizeof(*sp);
rewind(fp);
sp->magic = fl_fget4MSBF(fp);
sp->hdr_len = fl_fget4MSBF(fp);
sp->width = fl_fget4MSBF(fp);
sp->height = fl_fget4MSBF(fp);
sp->depth = fl_fget4MSBF(fp);
sp->compress = fl_fget4MSBF(fp);
sp->windoww = fl_fget4MSBF(fp);
sp->windowl = fl_fget4MSBF(fp);
if (sp->depth < 8 || sp->compress != 1)
return -1;
im->type = sp->depth == 8 ? FL_IMAGE_GRAY : FL_IMAGE_GRAY16;
im->gray_maxval = (1 << sp->depth) - 1;
im->w = sp->width;
im->h = sp->height;
return 0;
}
/* convert MSBF */
static void
convert_msbf(unsigned short *pixels, int npixels)
{
register unsigned short *p = pixels, *ps = p + npixels;
register unsigned char *c = (unsigned char *) p;
for (; p < ps; p++, c += 2)
*p = (c[0] << 8) | c[1];
}
static int
GENESIS_load(FL_IMAGE * im)
{
FILE *fp = im->fpin;
SPEC *sp = im->io_spec;
fseek(fp, sp->hdr_len, SEEK_SET);
fread(im->gray[0], sp->depth / 8, im->w * im->h, fp);
convert_msbf(im->gray[0], im->w * im->h);
return 0;
}
void
flimage_enable_genesis(void)
{
flimage_add_format("GE Genesis", "genesis", "ge",
FL_IMAGE_GRAY16 | FL_IMAGE_GRAY,
GENESIS_identify,
GENESIS_description,
GENESIS_load,
0);
}
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