/*

 * Copyright (c) 2002, 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

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 * questions.

 */

/*

 * @test

 * @bug 4450894

 * @summary Tests if the JPEGImageWriter allows images with > 8-bit samples to

 *          be written. Also tests the JPEGImageWriterSpi.canEncodeImage()

 *          mechanism for this same behavior.

 */

import java.awt.image.BufferedImage;

import java.io.ByteArrayOutputStream;

import java.io.IOException;

import java.util.Iterator;

import javax.imageio.ImageIO;

import javax.imageio.ImageTypeSpecifier;

import javax.imageio.ImageWriter;

import javax.imageio.stream.ImageOutputStream;

public class UshortGrayTest {

    public static void main(String[] args) {

        Iterator iter;

        BufferedImage bi = new BufferedImage(10, 10,

                                             BufferedImage.TYPE_USHORT_GRAY);

        // Part 1: ensure that JPEGImageWriter throws an exception if it

        // encounters an image with 16-bit samples

        ImageWriter writer = null;

        iter = ImageIO.getImageWritersByFormatName("jpeg");

        if (iter.hasNext()) {

            writer = (ImageWriter)iter.next();

        } else {

            throw new RuntimeException("No JPEG reader found");

        }

        ByteArrayOutputStream baos = new ByteArrayOutputStream();

        ImageOutputStream ios = null;

        boolean exceptionThrown = false;

        try {

            ios = ImageIO.createImageOutputStream(baos);

        } catch (IOException ioe) {

            throw new RuntimeException("Could not create ImageOutputStream");

        }

        try {

            writer.setOutput(ios);

            writer.write(bi);

        } catch (IOException ioe) {

            exceptionThrown = true;

        }

        if (!exceptionThrown) {

            throw new RuntimeException("JPEG writer should not be able to " +

                                       "write USHORT_GRAY images");

        }

        // Part 2: ensure that JPEGImageWriterSpi.canEncodeImage() returns

        // false for images with 16-bit samples

        ImageTypeSpecifier its =

            ImageTypeSpecifier.createFromRenderedImage(bi);

        iter = ImageIO.getImageWriters(its, "jpeg");

        if (iter.hasNext()) {

            throw new RuntimeException("JPEG writer should not be available" +

                                       " for USHORT_GRAY images");

        }

    }

}