/* 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 <glib/gi18n-lib.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.

 *

 * ::: seealso

 *     [method@Image.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;

}