132 lines
5.2 KiB
Java
132 lines
5.2 KiB
Java
/*
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* Copyright (c) 2003, 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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/*
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* @test
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* @bug 4888478
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* @summary Test that colors do not distort when buffered image with
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* premultiplied alpha is encoded to png format
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*/
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import java.awt.AlphaComposite;
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import java.awt.Color;
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import java.awt.Graphics2D;
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import java.awt.image.BufferedImage;
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import java.io.ByteArrayInputStream;
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import java.io.ByteArrayOutputStream;
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import javax.imageio.ImageIO;
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public class PngPremultAlphaTest {
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protected static int width = 100;
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protected static int height = 100;
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protected static String format = "png";
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protected static int[] iBufferedImageTypes = {
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BufferedImage.TYPE_INT_RGB,
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BufferedImage.TYPE_INT_ARGB,
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BufferedImage.TYPE_4BYTE_ABGR_PRE,
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BufferedImage.TYPE_INT_ARGB_PRE
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};
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protected static String[] strBufferedImageTypes = {
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"TYPE_INT_RGB",
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"TYPE_INT_ARGB",
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"BufferedImage.TYPE_4BYTE_ABGR_PRE",
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"BufferedImage.TYPE_INT_ARGB_PRE"
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};
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public static void main(String[] arg) {
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for(int i=0; i<iBufferedImageTypes.length; i++) {
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System.out.println("Test for " + strBufferedImageTypes[i]);
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doTest(iBufferedImageTypes[i]);
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}
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}
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public static void doTest(int type) {
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try {
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BufferedImage src = new BufferedImage(100, 100,
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type);
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Graphics2D g = src.createGraphics();
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g.setComposite(AlphaComposite.getInstance(AlphaComposite.SRC, 0.5f));
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g.setColor(new Color(0x20, 0x40, 0x60));
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g.fillRect(0,0,100,100);
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int[] samples = new int[src.getData().getNumBands()];
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src.getData().getPixels(0,0,1,1,samples);
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for(int i=0; i<samples.length; i++) {
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System.out.println("sample["+i+"]="+Integer.toHexString(samples[i]));
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}
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ByteArrayOutputStream baos = new ByteArrayOutputStream();
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ImageIO.write(src, format, baos);
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baos.close();
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ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
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BufferedImage dst = ImageIO.read(bais);
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isSameColors(src, dst);
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} catch (Exception e) {
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e.printStackTrace();
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throw new RuntimeException("Test failed.");
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}
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}
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private static boolean isSameColors(BufferedImage src, BufferedImage dst) {
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Object dstPixel = dst.getRaster().getDataElements(width/2, height/2, null);
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Object srcPixel = src.getRaster().getDataElements(width/2, height/2, null);
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// take into account the rounding error
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if ( Math.abs(src.getColorModel().getRed(srcPixel) - dst.getColorModel().getRed(dstPixel)) > 1
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|| Math.abs(src.getColorModel().getGreen(srcPixel) - dst.getColorModel().getGreen(dstPixel)) > 1
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|| Math.abs(src.getColorModel().getBlue(srcPixel) - dst.getColorModel().getBlue(dstPixel)) > 1) {
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showPixel(src, width/2, height/2);
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showPixel(dst, width/2, height/2);
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throw new RuntimeException( "Colors are different: "
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+ Integer.toHexString(src.getColorModel().getRGB(srcPixel))
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+ " and "
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+ Integer.toHexString(dst.getColorModel().getRGB(dstPixel)));
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}
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return true;
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}
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private static void showPixel(BufferedImage src, int x, int y) {
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System.out.println("Img is " + src);
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System.out.println("CM is " + src.getColorModel().getClass().getName());
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Object p = src.getRaster().getDataElements(x, y, null);
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System.out.println("RGB: " +
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Integer.toHexString(src.getColorModel().getRGB(p)));
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System.out.println("Red: " +
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Integer.toHexString(src.getColorModel().getRed(p)));
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System.out.println("Green: " +
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Integer.toHexString(src.getColorModel().getGreen(p)));
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System.out.println("Blue: " +
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Integer.toHexString(src.getColorModel().getBlue(p)));
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System.out.println("Alpha: " +
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Integer.toHexString(src.getColorModel().getAlpha(p)));
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}
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}
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