139 lines
2.7 KiB
C
139 lines
2.7 KiB
C
/* Turn Yxy to XYZ colourspace.
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*
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* Modified:
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* 29/5/02 JC
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* - from lab2xyz
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* 2/11/09
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* - gtkdoc
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* - cleanups
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* 20/9/12
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* - redo as a class
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* 29/8/19
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* - avoid /0
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*/
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/*
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This file is part of VIPS.
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VIPS is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA
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*/
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/*
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These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
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*/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif /*HAVE_CONFIG_H*/
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#include <glib/gi18n-lib.h>
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#include <stdio.h>
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#include <math.h>
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#include <vips/vips.h>
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#include "pcolour.h"
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typedef VipsColourTransform VipsYxy2XYZ;
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typedef VipsColourTransformClass VipsYxy2XYZClass;
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G_DEFINE_TYPE( VipsYxy2XYZ, vips_Yxy2XYZ, VIPS_TYPE_COLOUR_TRANSFORM );
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void
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vips_Yxy2XYZ_line( VipsColour *colour, VipsPel *out, VipsPel **in, int width )
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{
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float * restrict p = (float *) in[0];
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float * restrict q = (float *) out;
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int i;
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for( i = 0; i < width; i++ ) {
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float Y = p[0];
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float x = p[1];
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float y = p[2];
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float X, Z;
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if( x == 0.0 ||
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y == 0.0 ) {
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X = 0.0;
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Z = 0.0;
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}
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else {
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double total;
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total = Y / y;
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X = x * total;
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Z = (X - x * X - x * Y) / x;
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}
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q[0] = X;
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q[1] = Y;
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q[2] = Z;
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p += 3;
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q += 3;
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}
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}
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static void
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vips_Yxy2XYZ_class_init( VipsYxy2XYZClass *class )
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{
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VipsObjectClass *object_class = (VipsObjectClass *) class;
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VipsColourClass *colour_class = VIPS_COLOUR_CLASS( class );
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object_class->nickname = "Yxy2XYZ";
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object_class->description = _( "transform Yxy to XYZ" );
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colour_class->process_line = vips_Yxy2XYZ_line;
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}
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static void
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vips_Yxy2XYZ_init( VipsYxy2XYZ *Yxy2XYZ )
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{
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VipsColour *colour = VIPS_COLOUR( Yxy2XYZ );
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colour->interpretation = VIPS_INTERPRETATION_XYZ;
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}
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/**
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* vips_Yxy2XYZ: (method)
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* @in: input image
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* @out: (out): output image
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* @...: %NULL-terminated list of optional named arguments
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*
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* Turn XYZ to Yxy.
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*
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* Returns: 0 on success, -1 on error
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*/
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int
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vips_Yxy2XYZ( VipsImage *in, VipsImage **out, ... )
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{
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va_list ap;
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int result;
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va_start( ap, out );
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result = vips_call_split( "Yxy2XYZ", ap, in, out );
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va_end( ap );
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return( result );
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}
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