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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. If not, see <http://www.gnu.org/licenses/>.
*/
/*
* 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
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include "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 ];
size_t c;
c = fread( buf, 1, 4, fp );
rewind( fp );
return c == 4 && strncmp( buf, "IMGF", 4 ) == 0;
}
/***************************************
***************************************/
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 = fli_fget4MSBF( fp );
sp->hdr_len = fli_fget4MSBF( fp );
sp->width = fli_fget4MSBF( fp );
sp->height = fli_fget4MSBF( fp );
sp->depth = fli_fget4MSBF( fp );
sp->compress = fli_fget4MSBF( fp );
sp->windoww = fli_fget4MSBF( fp );
sp->windowl = fli_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 )
{
unsigned short *p = pixels,
*ps = p + npixels;
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 );
if ( fread( im->gray[ 0 ], sp->depth / 8, im->w * im->h, fp )
!= ( size_t ) im->w * im->h )
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 );
}
/*
* Local variables:
* tab-width: 4
* indent-tabs-mode: nil
* End:
*/
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