149 lines
3.2 KiB
C
149 lines
3.2 KiB
C
/* dE76.c
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*
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* Modified:
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* 16/11/94 JC
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* - partialed!
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* 31/10/09
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* - use im__colour_binary()
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* - gtkdoc comment
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* 25/10/12
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* - redone as a class
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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 <math.h>
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#include <vips/vips.h>
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#include <vips/debug.h>
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#include "pcolour.h"
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typedef struct _VipsdE76 {
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VipsColourDifference parent_instance;
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} VipsdE76;
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typedef VipsColourDifferenceClass VipsdE76Class;
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G_DEFINE_TYPE( VipsdE76, vips_dE76, VIPS_TYPE_COLOUR_DIFFERENCE );
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/**
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* vips_pythagoras:
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* @L1: Input coordinate 1
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* @a1: Input coordinate 1
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* @b1: Input coordinate 1
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* @L2: Input coordinate 2
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* @a2: Input coordinate 2
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* @b2: Input coordinate 2
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*
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* Pythagorean distance between two points in colour space. Lab/XYZ/CMC etc.
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*/
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float
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vips_pythagoras( float L1, float a1, float b1, float L2, float a2, float b2 )
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{
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float dL = L1 - L2;
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float da = a1 - a2;
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float db = b1 - b2;
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return( sqrt( dL * dL + da * da + db * db ) );
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}
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/* Find the difference between two buffers of LAB data.
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*/
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void
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vips__pythagoras_line( VipsColour *colour,
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VipsPel *out, VipsPel **in, int width )
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{
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float * restrict p1 = (float *) in[0];
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float * restrict p2 = (float *) in[1];
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float * restrict q = (float *) out;
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int x;
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for( x = 0; x < width; x++ ) {
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float dL = p1[0] - p2[0];
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float da = p1[1] - p2[1];
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float db = p1[2] - p2[2];
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q[x] = sqrt( dL * dL + da * da + db * db );
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p1 += 3;
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p2 += 3;
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}
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}
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static void
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vips_dE76_class_init( VipsdE76Class *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 = "dE76";
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object_class->description = _( "calculate dE76" );
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colour_class->process_line = vips__pythagoras_line;
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}
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static void
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vips_dE76_init( VipsdE76 *dE76 )
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{
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VipsColourDifference *difference = VIPS_COLOUR_DIFFERENCE( dE76 );
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difference->interpretation = VIPS_INTERPRETATION_LAB;
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}
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/**
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* vips_dE76:
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* @left: first input image
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* @right: second 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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* Calculate dE 76.
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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_dE76( VipsImage *left, VipsImage *right, 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( "dE76", ap, left, right, out );
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va_end( ap );
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return( result );
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}
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