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