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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 <vips/intl.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 - VIPS_FABS( fmod( p[0] / SIXTH_OF_CHAR, 2 ) - 1 ));
m = p[2] - c;
if( p[0] < SIXTH_OF_CHAR ) {
q[0] = c + m;
q[1] = x + m;
q[2] = 0 + m;
}
else if( p[0] < 2 * SIXTH_OF_CHAR ) {
q[0] = x + m;
q[1] = c + m;
q[2] = 0 + m;
}
else if( p[0] < 3 * SIXTH_OF_CHAR ) {
q[0] = 0 + m;
q[1] = c + m;
q[2] = x + m;
}
else if( p[0] < 4 * SIXTH_OF_CHAR ) {
q[0] = 0 + m;
q[1] = x + m;
q[2] = c + m;
}
else if( p[0] < 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:
* @in: input image
* @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 vips_Lab2LCh() for a
* much better colour space.
*
* See also: vips_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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