1 /* 2 * Copyright (c) 2000, 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 24 import java.awt.image.BufferedImage; 25 import java.awt.image.ColorModel; 26 import java.awt.image.Raster; 27 28 // Utility to compare two BufferedImages for RGB equality 29 public class ImageCompare { 30 31 public static void compare(BufferedImage oldimg, 32 BufferedImage newimg) { 33 int width = oldimg.getWidth(); 34 int height = oldimg.getHeight(); 35 if (newimg.getWidth() != width || newimg.getHeight() != height) { 36 throw new RuntimeException("Dimensions changed!"); 37 } 38 39 Raster oldras = oldimg.getRaster(); 40 ColorModel oldcm = oldimg.getColorModel(); 41 Raster newras = newimg.getRaster(); 42 ColorModel newcm = newimg.getColorModel(); 43 44 for (int j = 0; j < height; j++) { 45 for (int i = 0; i < width; i++) { 46 Object oldpixel = oldras.getDataElements(i, j, null); 47 int oldrgb = oldcm.getRGB(oldpixel); 48 int oldalpha = oldcm.getAlpha(oldpixel); 49 50 Object newpixel = newras.getDataElements(i, j, null); 51 int newrgb = newcm.getRGB(newpixel); 52 int newalpha = newcm.getAlpha(newpixel); 53 54 if (newrgb != oldrgb || 55 newalpha != oldalpha) { 56 throw new RuntimeException("Pixels differ at " + i + 57 ", " + j); 58 } 59 } 60 } 61 } 62 }