text: /* LabS2Lab() 
   *
   * 12/12/02 JC
   * 	- adapted from im_LabS2LabQ()
   * 2/11/09
   * 	- gtkdoc, cleanup
   */
  
  /*
  
      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
  
   */
  
  #ifdef HAVE_CONFIG_H
  #include <config.h>
  #endif /*HAVE_CONFIG_H*/
  #include <vips/intl.h>
  
  #include <stdio.h>
  
  #include <vips/vips.h>
  
  #include "pcolour.h"
  
  typedef VipsColourCode VipsLabS2Lab;
  typedef VipsColourCodeClass VipsLabS2LabClass;
  
  G_DEFINE_TYPE( VipsLabS2Lab, vips_LabS2Lab, VIPS_TYPE_COLOUR_CODE );
  
  /* Convert n pels from signed short to Lab.
   */
  static void
  vips_LabS2Lab_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
  {
  	signed short *p = (signed short *) in[0];
  	float *q = (float *) out;
  	int i;
  
  	for( i = 0; i < width; i++ ) {
  		q[0] = p[0] / (32767.0 / 100.0);
  		q[1] = p[1] / (32768.0 / 128.0);
  		q[2] = p[2] / (32768.0 / 128.0);
  
  		p += 3;
  		q += 3;
  	}
  }
  
  static void
  vips_LabS2Lab_class_init( VipsLabS2LabClass *class )
  {
  	VipsObjectClass *object_class = (VipsObjectClass *) class;
  	VipsColourClass *colour_class = VIPS_COLOUR_CLASS( class );
  
  	object_class->nickname = "LabS2Lab";
  	object_class->description = _( "transform signed short Lab to float" );
  
  	colour_class->process_line = vips_LabS2Lab_line;
  }
  
  static void
  vips_LabS2Lab_init( VipsLabS2Lab *LabS2Lab )
  {
  	VipsColour *colour = VIPS_COLOUR( LabS2Lab );
  	VipsColourCode *code = VIPS_COLOUR_CODE( LabS2Lab );
  
  	colour->interpretation = VIPS_INTERPRETATION_LAB;
  	colour->format = VIPS_FORMAT_FLOAT;
  	colour->input_bands = 3;
  	colour->bands = 3;
  
  	code->input_coding = VIPS_CODING_NONE;
  	code->input_format = VIPS_FORMAT_SHORT;
  }
  
  /**
   * vips_LabS2Lab: (method)
   * @in: input image
   * @out: (out): output image
   * @...: %NULL-terminated list of optional named arguments
   *
   * Convert a LabS three-band signed short image to a three-band float image.
   *
   * See also: vips_LabS2Lab().
   *
   * Returns: 0 on success, -1 on error.
   */
  int
  vips_LabS2Lab( VipsImage *in, VipsImage **out, ... )
  {
  	va_list ap;
  	int result;
  
  	va_start( ap, out );
  	result = vips_call_split( "LabS2Lab", ap, in, out );
  	va_end( ap );
  
  	return( result );
  }
  
  