jdk/test/javax/imageio/plugins/jpeg/ByteBinaryTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
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 * 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.
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/*
 * @test
 * @bug 4450894
 * @summary Tests if the JPEG writer properly encodes IndexColorModel images
 *          that contain less than 8-bit indices (such as TYPE_BYTE_BINARY)
 */

import java.awt.Color;
import java.awt.Graphics;
import java.awt.image.BufferedImage;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;

import javax.imageio.ImageIO;

public class ByteBinaryTest {

    private static final int[] expectedVals =
        { 0xffffffff, 0xff000000, 0xffffffff };

    public static void main(String[] args) {
        BufferedImage bi = new BufferedImage(100, 100,
                                             BufferedImage.TYPE_BYTE_BINARY);

        Graphics g = bi.createGraphics();
        g.setColor(Color.white);
        g.fillRect(0, 0, 100, 100);
        g.setColor(Color.black);
        g.fillRect(20, 20, 40, 40);
        g.setColor(Color.white);
        g.fillRect(25, 25, 25, 25);
        g.dispose();

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        boolean success;

        try {
            success = ImageIO.write(bi, "jpeg", baos);
        } catch (IOException ioe) {
            throw new RuntimeException("Could not write JPEG to stream");
        }

        if (!success) {
            throw new RuntimeException("Could not find valid JPEG writer...");
        }

        byte[] bytearr = baos.toByteArray();
        ByteArrayInputStream bais = new ByteArrayInputStream(bytearr);
        BufferedImage bi2 = null;

        try {
            bi2 = ImageIO.read(bais);
        } catch (IOException ioe) {
            throw new RuntimeException("Could not read JPEG stream");
        }

        int[] actualVals = new int[3];

        actualVals[0] = bi2.getRGB(27, 5);
        actualVals[1] = bi2.getRGB(27, 22);
        actualVals[2] = bi2.getRGB(35, 35);

        for (int i = 0; i < actualVals.length; i++) {
            if (actualVals[i] != expectedVals[i]) {
                throw new RuntimeException("Pixel mismatch at index: " + i);
            }
        }
    }
}