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/* to sRGB from HSV
*
* 9/6/15
* - from sRGB2HSV.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"
#define SIXTH_OF_CHAR (42.5)
typedef VipsColourCode VipsHSV2sRGB;
typedef VipsColourCodeClass VipsHSV2sRGBClass;
G_DEFINE_TYPE(VipsHSV2sRGB, vips_HSV2sRGB, VIPS_TYPE_COLOUR_CODE);
static void
vips_HSV2sRGB_line(VipsColour *colour, VipsPel *out, VipsPel **in, int width)
{
unsigned char *p = (unsigned char *) in[0];
unsigned char *q = (unsigned char *) out;
int i;
for (i = 0; i < width; i++) {
float c, x, m;
c = p[2] * p[1] / 255.0;
x = c * (1 - fabsf(fmodf(p[0] / SIXTH_OF_CHAR, 2) - 1));
m = p[2] - c;
if (p[0] < (int) SIXTH_OF_CHAR) {
q[0] = c + m;
q[1] = x + m;
q[2] = 0 + m;
}
else if (p[0] < (int) (2 * SIXTH_OF_CHAR)) {
q[0] = x + m;
q[1] = c + m;
q[2] = 0 + m;
}
else if (p[0] < (int) (3 * SIXTH_OF_CHAR)) {
q[0] = 0 + m;
q[1] = c + m;
q[2] = x + m;
}
else if (p[0] < (int) (4 * SIXTH_OF_CHAR)) {
q[0] = 0 + m;
q[1] = x + m;
q[2] = c + m;
}
else if (p[0] < (int) (5 * SIXTH_OF_CHAR)) {
q[0] = x + m;
q[1] = 0 + m;
q[2] = c + m;
}
else {
q[0] = c + m;
q[1] = 0 + m;
q[2] = x + m;
}
p += 3;
q += 3;
}
}
static void
vips_HSV2sRGB_class_init(VipsHSV2sRGBClass *class)
{
VipsObjectClass *object_class = (VipsObjectClass *) class;
VipsColourClass *colour_class = VIPS_COLOUR_CLASS(class);
object_class->nickname = "HSV2sRGB";
object_class->description = _("transform HSV to sRGB");
colour_class->process_line = vips_HSV2sRGB_line;
}
static void
vips_HSV2sRGB_init(VipsHSV2sRGB *HSV2sRGB)
{
VipsColour *colour = VIPS_COLOUR(HSV2sRGB);
VipsColourCode *code = VIPS_COLOUR_CODE(HSV2sRGB);
colour->interpretation = VIPS_INTERPRETATION_sRGB;
colour->format = VIPS_FORMAT_UCHAR;
colour->bands = 3;
colour->input_bands = 3;
code->input_coding = VIPS_CODING_NONE;
code->input_format = VIPS_FORMAT_UCHAR;
code->input_interpretation = VIPS_INTERPRETATION_HSV;
}
/**
* vips_HSV2sRGB: (method)
* @in: input image
* @out: (out): output image
* @...: `NULL`-terminated list of optional named arguments
*
* Convert HSV to sRGB.
*
* HSV is a crude polar coordinate system for RGB images. It is provided for
* compatibility with other image processing systems. See [method@Image.Lab2LCh] for a
* much better colour space.
*
* ::: seealso
* [method@Image.sRGB2HSV].
*
* Returns: 0 on success, -1 on error.
*/
int
vips_HSV2sRGB(VipsImage *in, VipsImage **out, ...)
{
va_list ap;
int result;
va_start(ap, out);
result = vips_call_split("HSV2sRGB", ap, in, out);
va_end(ap);
return result;
}
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