63 lines
2.4 KiB
Java
63 lines
2.4 KiB
Java
/*
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* Copyright (c) 2000, 2017, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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import java.awt.image.BufferedImage;
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import java.awt.image.ColorModel;
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import java.awt.image.Raster;
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// Utility to compare two BufferedImages for RGB equality
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public class ImageCompare {
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public static void compare(BufferedImage oldimg,
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BufferedImage newimg) {
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int width = oldimg.getWidth();
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int height = oldimg.getHeight();
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if (newimg.getWidth() != width || newimg.getHeight() != height) {
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throw new RuntimeException("Dimensions changed!");
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}
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Raster oldras = oldimg.getRaster();
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ColorModel oldcm = oldimg.getColorModel();
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Raster newras = newimg.getRaster();
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ColorModel newcm = newimg.getColorModel();
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for (int j = 0; j < height; j++) {
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for (int i = 0; i < width; i++) {
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Object oldpixel = oldras.getDataElements(i, j, null);
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int oldrgb = oldcm.getRGB(oldpixel);
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int oldalpha = oldcm.getAlpha(oldpixel);
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Object newpixel = newras.getDataElements(i, j, null);
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int newrgb = newcm.getRGB(newpixel);
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int newalpha = newcm.getAlpha(newpixel);
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if (newrgb != oldrgb ||
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newalpha != oldalpha) {
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throw new RuntimeException("Pixels differ at " + i +
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", " + j);
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}
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}
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}
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}
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}
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