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. Oracle designates this
   8  * particular file as subject to the "Classpath" exception as provided
   9  * by Oracle in the LICENSE file that accompanied this code.
  10  *
  11  * This code is distributed in the hope that it will be useful, but WITHOUT
  12  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  13  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  14  * version 2 for more details (a copy is included in the LICENSE file that
  15  * accompanied this code).
  16  *
  17  * You should have received a copy of the GNU General Public License version
  18  * 2 along with this work; if not, write to the Free Software Foundation,
  19  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  20  *
  21  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  22  * or visit www.oracle.com if you need additional information or have any
  23  * questions.
  24  */
  25 package org.jemmy.image.pixel;
  26 
  27 import org.jemmy.Dimension;
  28 
  29 /**
  30  *
  31  * @author shura
  32  */
  33 public class AverageDistanceComparator extends ThresholdComparator {
  34 
  35     /**
  36      *
  37      * @param threshold
  38      */
  39     public AverageDistanceComparator(double threshold) {
  40         super(0, Math.sqrt(3));
  41         setThreshold(threshold);
  42     }
  43 
  44     /**
  45      *
  46      * @param image1
  47      * @param image2
  48      * @return
  49      */
  50     public boolean compare(Raster image1, Raster image2) {
  51         Dimension size = PixelImageComparator.computeDiffSize(image1, image2);
  52         if (size == null) {
  53             return false;
  54         }
  55         int totalPixels = size.width * size.height;
  56         double distance = 0;
  57         double[] colors1 = new double[image1.getSupported().length];
  58         double[] colors2 = new double[image2.getSupported().length];
  59         for (int x = 0; x < size.width; x++) {
  60             for (int y = 0; y < size.height; y++) {
  61                 image1.getColors(x, y, colors1);
  62                 image2.getColors(x, y, colors2);
  63                 distance += distance(image1.getSupported(), colors1, image2.getSupported(), colors2) / totalPixels;
  64             }
  65         }
  66         return distance < getThreshold();
  67     }
  68 
  69     public static final Raster.Component[] DISTANCE_COMPONENTS = {
  70         Raster.Component.RED, Raster.Component.BLUE, Raster.Component.GREEN
  71     };
  72     static double distance(Raster.Component[] comps1, double[] colors1, Raster.Component[] comps2, double[] colors2) {
  73         double res = 0;
  74         double diff;
  75         for (Raster.Component c : DISTANCE_COMPONENTS) {
  76             diff = colors2[PixelImageComparator.arrayIndexOf(comps2, c)] -
  77                     colors1[PixelImageComparator.arrayIndexOf(comps1, c)];
  78             res += diff * diff;
  79         }
  80         return Math.sqrt(res);
  81     }
  82 
  83     /**
  84      *
  85      * @return
  86      */
  87     public String getID() {
  88         return AverageDistanceComparator.class.getName() + ":" + getThreshold();
  89     }
  90 }