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 }