Java example source code file (GIFPassListenerTest.java)

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Java - Java tags/keywords

awt, bufferedimage, bytearrayinputstream, bytearrayoutputstream, gifpasslistenertest, iioreadupdatelistener, image, imageinputstream, imageio, imageoutputstream, imagereader, imagewriter, ioexception, iterator, override, readupdatehandler, runtimeexception, util

The GIFPassListenerTest.java Java example source code

/*
 * Copyright (c) 2012, 2013, 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.
 */

/*
 * @test
 * @bug 4892259
 *
 * @summary Verify that calls to IIOReadUpdateListener passStarted and
 * passComplete are consistent.
 *
 * @run main GIFPassListenerTest
 */

import java.awt.image.*;
import java.io.*;
import java.util.*;
import javax.imageio.*;
import javax.imageio.event.*;
import javax.imageio.stream.*;

public class GIFPassListenerTest {

    private static ImageInputStream createTestImageStream(boolean progressive) throws IOException {
        ByteArrayOutputStream output = new ByteArrayOutputStream();
        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("gif");
        if (!writers.hasNext()) {
            return null;
        }
        ImageWriter writer = writers.next();
        ImageWriteParam param = writer.getDefaultWriteParam();
        param.setProgressiveMode(progressive ?
                ImageWriteParam.MODE_DEFAULT : ImageWriteParam.MODE_DISABLED);
        ImageOutputStream imageOutput = ImageIO.createImageOutputStream(output);
        writer.setOutput(imageOutput);
        BufferedImage image = new BufferedImage(100, 100, BufferedImage.TYPE_INT_ARGB);
        writer.write(null, new IIOImage(image, null, null), param);
        imageOutput.flush();
        ByteArrayInputStream input = new ByteArrayInputStream(output.toByteArray());
        return ImageIO.createImageInputStream(input);
    }

    private static void checkImage(boolean progressive) throws Exception {
        ImageInputStream iis = createTestImageStream(progressive);
        ImageReader reader = ImageIO.getImageReaders(iis).next();
        reader.setInput(iis);
        ReadUpdateHandler handler = new ReadUpdateHandler();
        reader.addIIOReadUpdateListener(handler);
        reader.readAll(null);
        if (handler.isPassStarted) {
            throw new RuntimeException("passStarted without passComplete.");
        }
        if (progressive && (handler.numPasses == 0)) {
            throw new RuntimeException("passStarted wasn't called for progressive image");
        }
        if (!progressive && (handler.numPasses != 0)) {
            throw new RuntimeException("passStarted was called for non-progressive image");
        }
        iis.close();
    }

    public static void main(String args[]) throws Exception {
        checkImage(true);
        checkImage(false);
    }

    private static class ReadUpdateHandler implements IIOReadUpdateListener {
        public boolean isPassStarted = false;
        public int numPasses = 0;

        @Override
        public void imageUpdate(ImageReader source, BufferedImage theImage, int minX, int minY,
                int width, int height, int periodX, int periodY, int[] bands) {
        }

        @Override
        public void passStarted(ImageReader source, BufferedImage theImage, int pass, int minPass,
                int maxPass, int minX, int minY, int periodX, int periodY, int[] bands) {
            if (isPassStarted) {
                throw new RuntimeException("reentered passStarted!");
            }
            isPassStarted = true;
            numPasses++;
        }

        @Override
        public void passComplete(ImageReader source, BufferedImage theImage) {
            if (!isPassStarted) {
                throw new RuntimeException("passComplete without passStarted!");
            }
            isPassStarted = false;
        }

        @Override
        public void thumbnailPassStarted(ImageReader source, BufferedImage theThumbnail, int pass,
                int minPass, int maxPass, int minX, int minY, int periodX, int periodY, int[] bands) {
        }

        @Override
        public void thumbnailPassComplete(ImageReader source, BufferedImage theThumbnail) {
        }

        @Override
        public void thumbnailUpdate(ImageReader source, BufferedImage theThumbnail, int minX, int minY,
                int width, int height, int periodX, int periodY, int[] bands) {
        }
    }
}