text: /* load radlab from a file
   *
   * 5/12/11
   * 	- from tiffload.c
   */
  
  /*
  
      This file is part of VIPS.
      
      VIPS 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 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 Lesser General Public License for more details.
  
      You should have received a copy of the GNU Lesser General Public License
      along with this program; if not, write to the Free Software
      Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
      02110-1301  USA
  
   */
  
  /*
  
      These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
  
   */
  
  /*
  #define DEBUG
   */
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif /*HAVE_CONFIG_H*/
  #include <vips/intl.h>
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  
  #include <vips/vips.h>
  #include <vips/buf.h>
  #include <vips/internal.h>
  
  #include "radiance.h"
  
  typedef struct _VipsForeignLoadRad {
  	VipsForeignLoad parent_object;
  
  	/* Filename for load.
  	 */
  	char *filename; 
  
  } VipsForeignLoadRad;
  
  typedef VipsForeignLoadClass VipsForeignLoadRadClass;
  
  G_DEFINE_TYPE( VipsForeignLoadRad, vips_foreign_load_rad, 
  	VIPS_TYPE_FOREIGN_LOAD );
  
  static VipsForeignFlags
  vips_foreign_load_rad_get_flags_filename( const char *filename )
  {
  	/* The rad reader supports sequential read.
  	 */
  	return( VIPS_FOREIGN_SEQUENTIAL );
  }
  
  static VipsForeignFlags
  vips_foreign_load_rad_get_flags( VipsForeignLoad *load )
  {
  	VipsForeignLoadRad *rad = (VipsForeignLoadRad *) load;
  
  	return( vips_foreign_load_rad_get_flags_filename( rad->filename ) );
  }
  
  static int
  vips_foreign_load_rad_header( VipsForeignLoad *load )
  {
  	VipsForeignLoadRad *rad = (VipsForeignLoadRad *) load;
  
  	if( vips__rad_header( rad->filename, load->out ) )
  		return( -1 );
  
  	VIPS_SETSTR( load->out->filename, rad->filename );
  
  	return( 0 );
  }
  
  static int
  vips_foreign_load_rad_load( VipsForeignLoad *load )
  {
  	VipsForeignLoadRad *rad = (VipsForeignLoadRad *) load;
  
  	if( vips__rad_load( rad->filename, load->real,
  		load->access == VIPS_ACCESS_SEQUENTIAL ) )
  		return( -1 );
  
  	return( 0 );
  }
  
  static void
  vips_foreign_load_rad_class_init( VipsForeignLoadRadClass *class )
  {
  	GObjectClass *gobject_class = G_OBJECT_CLASS( class );
  	VipsObjectClass *object_class = (VipsObjectClass *) class;
  	VipsForeignClass *foreign_class = (VipsForeignClass *) class;
  	VipsForeignLoadClass *load_class = (VipsForeignLoadClass *) class;
  
  	gobject_class->set_property = vips_object_set_property;
  	gobject_class->get_property = vips_object_get_property;
  
  	object_class->nickname = "radload";
  	object_class->description = _( "load a Radiance image from a file" );
  
  	foreign_class->suffs = vips__rad_suffs;
  
  	/* is_a() is not that quick ... lower the priority.
  	 */
  	foreign_class->priority = -50;
  
  	load_class->is_a = vips__rad_israd;
  	load_class->get_flags_filename = 
  		vips_foreign_load_rad_get_flags_filename;
  	load_class->get_flags = vips_foreign_load_rad_get_flags;
  	load_class->header = vips_foreign_load_rad_header;
  	load_class->load = vips_foreign_load_rad_load;
  
  	VIPS_ARG_STRING( class, "filename", 1, 
  		_( "Filename" ),
  		_( "Filename to load from" ),
  		VIPS_ARGUMENT_REQUIRED_INPUT, 
  		G_STRUCT_OFFSET( VipsForeignLoadRad, filename ),
  		NULL );
  }
  
  static void
  vips_foreign_load_rad_init( VipsForeignLoadRad *rad )
  {
  }
  
  /**
   * vips_radload:
   * @filename: file to load
   * @out: output image
   * @...: %NULL-terminated list of optional named arguments
   *
   * Read a Radiance (HDR) file into a VIPS image. 
   *
   * Radiance files are read as #VIPS_CODING_RAD. They have one byte for each of
   * red, green and blue, and one byte of shared exponent. Some operations (like
   * vips_extract_area()) can work directly with images in this format, but 
   * mmany (all the arithmetic operations, for example) will not. Unpack 
   * #VIPS_CODING_RAD images to 3 band float with vips_rad2float() if 
   * you want to do arithmetic on them.
   *
   * This operation ignores some header fields, like VIEW and DATE. It will not 
   * rotate/flip as the FORMAT string asks.
   *
   * Sections of this reader from Greg Ward and Radiance with kind permission. 
   *
   * See also: vips_image_new_from_file().
   *
   * Returns: 0 on success, -1 on error.
   */
  int
  vips_radload( const char *filename, VipsImage **out, ... )
  {
  	va_list ap;
  	int result;
  
  	va_start( ap, out );
  	result = vips_call_split( "radload", ap, filename, out ); 
  	va_end( ap );
  
  	return( result );
  }
  
  