1 /*
   2  * Copyright (c) 2007, 2017 Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 package org.jemmy.image.pixel;
  24 
  25 import org.jemmy.Dimension;
  26 
  27 /**
  28  *
  29  * @author shura
  30  */
  31 public class AverageDistanceComparator extends ThresholdComparator {
  32 
  33     /**
  34      *
  35      * @param threshold
  36      */
  37     public AverageDistanceComparator(double threshold) {
  38         super(0, Math.sqrt(3));
  39         setThreshold(threshold);
  40     }
  41 
  42     /**
  43      *
  44      * @param image1
  45      * @param image2
  46      * @return
  47      */
  48     public boolean compare(Raster image1, Raster image2) {
  49         Dimension size = PixelImageComparator.computeDiffSize(image1, image2);
  50         if (size == null) {
  51             return false;
  52         }
  53         int totalPixels = size.width * size.height;
  54         double distance = 0;
  55         double[] colors1 = new double[image1.getSupported().length];
  56         double[] colors2 = new double[image2.getSupported().length];
  57         for (int x = 0; x < size.width; x++) {
  58             for (int y = 0; y < size.height; y++) {
  59                 image1.getColors(x, y, colors1);
  60                 image2.getColors(x, y, colors2);
  61                 distance += distance(image1.getSupported(), colors1, image2.getSupported(), colors2) / totalPixels;
  62             }
  63         }
  64         return distance < getThreshold();
  65     }
  66 
  67     public static final Raster.Component[] DISTANCE_COMPONENTS = {
  68         Raster.Component.RED, Raster.Component.BLUE, Raster.Component.GREEN
  69     };
  70     static double distance(Raster.Component[] comps1, double[] colors1, Raster.Component[] comps2, double[] colors2) {
  71         double res = 0;
  72         double diff;
  73         for (Raster.Component c : DISTANCE_COMPONENTS) {
  74             diff = colors2[PixelImageComparator.arrayIndexOf(comps2, c)] -
  75                     colors1[PixelImageComparator.arrayIndexOf(comps1, c)];
  76             res += diff * diff;
  77         }
  78         return Math.sqrt(res);
  79     }
  80 
  81     /**
  82      *
  83      * @return
  84      */
  85     public String getID() {
  86         return AverageDistanceComparator.class.getName() + ":" + getThreshold();
  87     }
  88 }