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/* _Oklch2Oklab
*
* 3/12/25
* - from LCh2Lab.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
*/
#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 VipsColourTransform VipsOklch2Oklab;
typedef VipsColourTransformClass VipsOklch2OklabClass;
G_DEFINE_TYPE(VipsOklch2Oklab, vips_Oklch2Oklab, VIPS_TYPE_COLOUR_TRANSFORM);
/* Process a buffer of data.
*/
static void
vips_Oklch2Oklab_line(VipsColour *colour, VipsPel *out, VipsPel **in, int width)
{
float *restrict p = (float *) in[0];
float *restrict q = (float *) out;
for (int x = 0; x < width; x++) {
float L = p[0];
float C = p[1];
float h = p[2];
p += 3;
float a, b;
vips_col_Ch2ab(C, h, &a, &b);
q[0] = L;
q[1] = a;
q[2] = b;
q += 3;
}
}
static void
vips_Oklch2Oklab_class_init(VipsOklch2OklabClass *class)
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsColourClass *colour_class = VIPS_COLOUR_CLASS(class);
object_class->nickname = "Oklch2Oklab";
object_class->description = _("transform Oklch to Oklab");
colour_class->process_line = vips_Oklch2Oklab_line;
}
static void
vips_Oklch2Oklab_init(VipsOklch2Oklab *Oklch2Oklab)
{
VipsColour *colour = VIPS_COLOUR(Oklch2Oklab);
colour->interpretation = VIPS_INTERPRETATION_OKLAB;
}
/**
* vips_Oklch2Oklab: (method)
* @in: input image
* @out: (out): output image
* @...: `NULL`-terminated list of optional named arguments
*
* Turn Oklch to Oklab.
*
* Returns: 0 on success, -1 on error
*/
int
vips_Oklch2Oklab(VipsImage *in, VipsImage **out, ...)
{
va_list ap;
int result;
va_start(ap, out);
result = vips_call_split("Oklch2Oklab", ap, in, out);
va_end(ap);
return result;
}
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