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/* Lab2LabS: quantise FLOAT Lab image into signed short format
*
* 12/12/02 JC
* - from im_Lab2LabS
* 1/11/09
* - gtkdoc
* - cleanups
* 20/9/12
* - redo as a class
* 13/7/24
* - clip out of range values
*/
/*
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 <math.h>
#include <vips/vips.h>
#include "pcolour.h"
typedef VipsColourCode VipsLab2LabS;
typedef VipsColourCodeClass VipsLab2LabSClass;
G_DEFINE_TYPE(VipsLab2LabS, vips_Lab2LabS, VIPS_TYPE_COLOUR_CODE);
static void
vips_Lab2LabS_line(VipsColour *colour, VipsPel *out, VipsPel **in, int width)
{
float *restrict p = (float *) in[0];
signed short *restrict q = (signed short *) out;
int i;
for (i = 0; i < width; i++) {
q[0] = VIPS_CLIP(0, p[0] * (32767.0 / 100.0), SHRT_MAX);
q[1] = VIPS_CLIP(SHRT_MIN, p[1] * (32768.0 / 128.0), SHRT_MAX);
q[2] = VIPS_CLIP(SHRT_MIN, p[2] * (32768.0 / 128.0), SHRT_MAX);
q += 3;
p += 3;
}
}
static void
vips_Lab2LabS_class_init(VipsLab2LabSClass *class)
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsColourClass *colour_class = VIPS_COLOUR_CLASS(class);
object_class->nickname = "Lab2LabS";
object_class->description = _("transform float Lab to signed short");
colour_class->process_line = vips_Lab2LabS_line;
}
static void
vips_Lab2LabS_init(VipsLab2LabS *Lab2LabS)
{
VipsColour *colour = VIPS_COLOUR(Lab2LabS);
VipsColourCode *code = VIPS_COLOUR_CODE(Lab2LabS);
colour->interpretation = VIPS_INTERPRETATION_LABS;
colour->format = VIPS_FORMAT_SHORT;
colour->input_bands = 3;
colour->bands = 3;
code->input_coding = VIPS_CODING_NONE;
code->input_format = VIPS_FORMAT_FLOAT;
}
/**
* vips_Lab2LabS: (method)
* @in: input image
* @out: (out): output image
* @...: `NULL`-terminated list of optional named arguments
*
* Turn Lab to LabS, signed 16-bit int fixed point.
*
* ::: seealso
* [method@Image.LabQ2Lab].
*
* Returns: 0 on success, -1 on error.
*/
int
vips_Lab2LabS(VipsImage *in, VipsImage **out, ...)
{
va_list ap;
int result;
va_start(ap, out);
result = vips_call_split("Lab2LabS", ap, in, out);
va_end(ap);
return result;
}
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