Java 类javax.imageio.ImageWriter 实例源码

public static void main(String[] args) {
    ImageWriter w = ImageIO.getImageWritersByFormatName(format).next();
    if (w == null) {
        throw new RuntimeException("No available writers for format " + format);
    }
    ImageWriteParam p = w.getDefaultWriteParam();

    ImageTypeSpecifier t =
            ImageTypeSpecifier.createFromBufferedImageType(BufferedImage.TYPE_INT_RGB);

    IIOMetadata m = w.getDefaultImageMetadata(t, p);
    System.out.println("Default image metadata is " + m);
    testWritableMetadata(m);

    IIOMetadata sm = w.getDefaultStreamMetadata(p);
    System.out.println("Default stream metadata is " + sm);
    testWritableMetadata(sm);
}

void save(File file) throws IOException {
    ImageWriter iw = null;
    String name = file.getName();
    int i = name.lastIndexOf('.');
    if (i >= 0) {
        String extension = name.substring(i + 1);
        Iterator<ImageWriter> imageWritersBySuffix = ImageIO.getImageWritersBySuffix(extension);
        if (imageWritersBySuffix.hasNext()) {
            iw = imageWritersBySuffix.next();
        }
    }
    if (iw != null) {
        file.delete();
        ImageOutputStream ios = ImageIO.createImageOutputStream(file);
        iw.setOutput(ios);
        try {
            iw.write((BufferedImage) image);
        } finally {
            iw.dispose();
            ios.flush();
            ios.close();
        }
    } else {
        ImageIO.write((BufferedImage) image, "PNG", file);
    }
}

@Test
public void testEncode() throws IOException {
  ImageWriter writer = Streams.stream(ImageIO.getImageWritersByFormatName("jpeg"))
      .filter(TurboJpegImageWriter.class::isInstance)
      .findFirst().get();
  ImageWriteParam param = writer.getDefaultWriteParam();
  param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
  param.setCompressionQuality(0.85f);
  BufferedImage in = ImageIO.read(ClassLoader.getSystemResource("crop_aligned.jpg"));
  ByteArrayOutputStream os = new ByteArrayOutputStream();
  try (ImageOutputStream ios = ImageIO.createImageOutputStream(os)) {
    writer.setOutput(ios);
    writer.write(null, new IIOImage(in, null, null), param);
  }
  os.flush();
  assertThat(os.toByteArray()).isNotEmpty();
}

/**
 * Create the gif and clear down afterwards.
 * 
 * @return the gif byte data
 * @throws IOException if the output fails
 */
public byte[] createGif() throws IOException {
    try {
        ImageOutputStream ios = ImageIO.createImageOutputStream(baos); // N.b. not try with closure because we need to close the stream before returning
        ImageWriter iw = ImageIO.getImageWritersByFormatName("gif").next(); 
        iw.setOutput(ios);
        iw.prepareWriteSequence(null);
        int index = 0;
        ImageWriteParam iwp = iw.getDefaultWriteParam();
        String frameDelay = String.valueOf(OptionsObject.getInstance().getGifDisplayTimeMillis() / 10L);
        log.debug("Frames size: {}, Free memory {}", frames.size(), Runtime.getRuntime().freeMemory());
        for (BufferedImage frame : frames) {
            IIOMetadata metadata = iw.getDefaultImageMetadata(new ImageTypeSpecifier(frame), iwp);
            configureMetaData(metadata, frameDelay, index++);
            iw.writeToSequence(new IIOImage(frame, null, metadata), null);
        }
        iw.endWriteSequence();
        ios.close();
        return baos.toByteArray();
    } finally {
        baos = null;
        frames = null;
    }
}

public void runTest(Object ctx, int numReps) {
    final Context ictx = (Context)ctx;
    final ImageWriter writer = ictx.writer;
    final BufferedImage image = ictx.image;
    do {
        try {
            ImageOutputStream ios = ictx.createImageOutputStream();
            writer.setOutput(ios);
            writer.write(image);
            writer.reset();
            ios.close();
            ictx.closeOriginalStream();
        } catch (IOException e) {
            e.printStackTrace();
        }
    } while (--numReps >= 0);
}

public static void main(String[] args) throws Exception {
    String format = "javax_imageio_1.0";
    BufferedImage img =
        new BufferedImage(16, 16, BufferedImage.TYPE_INT_RGB);
    ImageWriter iw = ImageIO.getImageWritersByMIMEType("image/png").next();
    IIOMetadata meta =
        iw.getDefaultImageMetadata(new ImageTypeSpecifier(img), null);
    DOMImplementationRegistry registry;
    registry = DOMImplementationRegistry.newInstance();
    DOMImplementation impl = registry.getDOMImplementation("XML 3.0");
    Document doc = impl.createDocument(null, format, null);
    Element root, text, entry;
    root = doc.getDocumentElement();
    root.appendChild(text = doc.createElement("Text"));
    text.appendChild(entry = doc.createElement("TextEntry"));
    // keyword isn't #REQUIRED by the standard metadata format.
    // However, it is required by the PNG format, so we include it here.
    entry.setAttribute("keyword", "Comment");
    entry.setAttribute("value", "Some demo comment");
    meta.mergeTree(format, root);
}

private String convertPngToJpeg(String pngBase64) throws IOException {
    byte[] pngBinary = DatatypeConverter.parseBase64Binary(pngBase64);
    InputStream in = new ByteArrayInputStream(pngBinary);
    BufferedImage pngImage = ImageIO.read(in);

    int width = pngImage.getWidth(), height = pngImage.getHeight();
    BufferedImage jpgImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);

    Graphics2D g = jpgImage.createGraphics();
    g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
    g.setBackground(Color.WHITE);
    g.clearRect(0, 0, width, height);
    g.drawImage(pngImage, 0, 0, width, height, null);
    g.dispose();

    final ImageWriter writer = ImageIO.getImageWritersByFormatName("jpeg").next();
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    writer.setOutput(ImageIO.createImageOutputStream(baos));
    writer.write(null, new IIOImage(jpgImage, null, null), JPEG_PARAMS);

    String jpgBase64 = DatatypeConverter.printBase64Binary(baos.toByteArray());
    return jpgBase64;
}

/**
 * Encodes an image in JPEG format and writes it to an output stream.
 *
 * @param bufferedImage  the image to be encoded (<code>null</code> not 
 *     permitted).
 * @param outputStream  the OutputStream to write the encoded image to 
 *     (<code>null</code> not permitted).
 * 
 * @throws IOException if there is an I/O problem.
 * @throws NullPointerException if <code>bufferedImage</code> is 
 *     <code>null</code>.
 */
public void encode(BufferedImage bufferedImage, OutputStream outputStream) 
        throws IOException {
    if (bufferedImage == null) {
        throw new IllegalArgumentException("Null 'image' argument.");
    }
    if (outputStream == null) {
        throw new IllegalArgumentException("Null 'outputStream' argument.");
    }
    Iterator iterator = ImageIO.getImageWritersByFormatName("jpeg");
    ImageWriter writer = (ImageWriter) iterator.next();
    ImageWriteParam p = writer.getDefaultWriteParam();
    p.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    p.setCompressionQuality(this.quality);
    ImageOutputStream ios = ImageIO.createImageOutputStream(outputStream);
    writer.setOutput(ios);
    writer.write(null, new IIOImage(bufferedImage, null, null), p);
    ios.flush();
    writer.dispose();
    ios.close();
}

/**
 * 根据质量压缩图片，不改变图片的尺寸
 * 
 * @param imgContent
 *            图片内容
 * @param quality
 *            缩放比例
 * @param extName
 *            后缀名
 * @return
 */
public byte[] compress(byte[] imgContent, float quality, String extName) {
    if (quality > 1 || quality <= 0 || imgContent == null || WakaUtils.string.isEmpty(extName)) {
        throw new ZhhrUtilException("压缩文件失败！入参为空");
    }
    try (InputStream is = new ByteArrayInputStream(imgContent);
            ByteArrayOutputStream os = new ByteArrayOutputStream();
            ImageOutputStream ios = ImageIO.createImageOutputStream(os);) {
        BufferedImage image = ImageIO.read(is);

        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName(extName);
        ImageWriter writer = writers.next();
        writer.setOutput(ios);

        ImageWriteParam param = writer.getDefaultWriteParam();
        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        param.setCompressionQuality(quality);

        writer.write(null, new IIOImage(image, null, null), param);
        writer.dispose();

        return os.toByteArray();
    } catch (IOException e) {
        throw new ZhhrUtilException(e.getMessage(), e);
    }
}

public void compressSave(MultipartFile file, String uploadLocation) throws IOException {
    //Compresses JPG file but kills the quality.
    BufferedImage image = ImageIO.read(new ByteArrayInputStream(file.getBytes()));
    File compressedImageFile = new File(uploadLocation);
    OutputStream os = new FileOutputStream(compressedImageFile);
    Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName("jpg");
    ImageWriter writer = (ImageWriter) writers.next();
    ImageOutputStream ios = ImageIO.createImageOutputStream(os);
    writer.setOutput(ios);
    ImageWriteParam param = writer.getDefaultWriteParam();
    if(param.canWriteCompressed()) {
        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        param.setCompressionQuality(0.05f);
    }

    writer.write(null, new IIOImage(image, null, null), param);
}

public static void main(String[] args) throws IOException {
    String format = "GIF";
    ImageWriter writer = ImageIO.getImageWritersByFormatName(format).next();

    ImageWriteParam param = writer.getDefaultWriteParam();

    IIOMetadata streamMetadata = writer.getDefaultStreamMetadata(param);

    boolean gotException = false;
    try {
        writer.prepareWriteSequence(streamMetadata);
    } catch (IllegalStateException e) {
        gotException = true;
        System.out.println("Test passed.");
        e.printStackTrace(System.out);
    }

    if (!gotException) {
        throw new RuntimeException("Test failed.");
    }
}

public void createAnimatedImage(BufferedImage bi, IIOMetadata metadata,
        ImageWriter writer, File outputFile) {
    try {

        fos = new FileOutputStream(outputFile);
        ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
        System.out.println(ios);
        writer.setOutput(ios);

        ImageWriteParam param = writer.getDefaultWriteParam();
        IIOMetadata streamData = writer.getDefaultStreamMetadata(param);

        writer.prepareWriteSequence(streamData);
        ImageTypeSpecifier specify = new ImageTypeSpecifier(bi);
        IIOMetadata imgData = writer.convertImageMetadata(
                (IIOMetadata) metadata, specify, param);
        GIFImageMetadata gifData = setAnimationProperties(imgData);
        IIOImage iim = new IIOImage(bi, null, gifData);
        param.setProgressiveMode(param.MODE_DISABLED);
        writer.writeToSequence(iim, param);
        writer.endWriteSequence();
        ios.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

public void doTest() {
    File pwd = new File(".");
    try {
        File f = File.createTempFile("transparency_test_", ".gif", pwd);
        System.out.println("file: " + f.getCanonicalPath());

        ImageWriter w = ImageIO.getImageWritersByFormatName("GIF").next();

        ImageWriterSpi spi = w.getOriginatingProvider();

        boolean succeed_write = ImageIO.write(src, "gif", f);

        if (!succeed_write) {
            throw new RuntimeException("Test failed: failed to write src.");
        }

        dst = ImageIO.read(f);

        checkResult(src, dst);

    } catch (IOException e) {
        throw new RuntimeException("Test failed.", e);
    }
}

private static Image createTestImage() throws IOException  {
    BufferedImage frame1 = createFrame(new int[] { 0xffff0000, 0xffff0000 });
    BufferedImage frame2 = createFrame(new int[] { 0xff0000ff, 0xffff0000 });

    ImageWriter writer = ImageIO.getImageWritersByFormatName("GIF").next();
    ImageOutputStream ios = ImageIO.createImageOutputStream(new File("lut_test.gif"));
    ImageWriteParam param = writer.getDefaultWriteParam();
    writer.setOutput(ios);
    writer.prepareWriteSequence(null);
    writer.writeToSequence(new IIOImage(frame1, null, null), param);
    writer.writeToSequence(new IIOImage(frame2, null, null), param);
    writer.endWriteSequence();
    writer.reset();
    writer.dispose();

    ios.flush();
    ios.close();

    return Toolkit.getDefaultToolkit().createImage("lut_test.gif");
}

public void doTest() {
    File pwd = new File(".");
    try {
        File f = File.createTempFile("transparency_test_", ".gif", pwd);
        System.out.println("file: " + f.getCanonicalPath());

        ImageWriter w = ImageIO.getImageWritersByFormatName("GIF").next();

        ImageWriterSpi spi = w.getOriginatingProvider();

        boolean succeed_write = ImageIO.write(src, "gif", f);

        if (!succeed_write) {
            throw new RuntimeException("Test failed: failed to write src.");
        }

        dst = ImageIO.read(f);

        checkResult(src, dst);

    } catch (IOException e) {
        throw new RuntimeException("Test failed.", e);
    }
}

public static byte[] setGlitchQuality(byte[] inputImageBytes, int quality) throws Exception
{
    Iterator<ImageWriter> iter = ImageIO.getImageWritersByFormatName("png");
    ImageWriter writer = (ImageWriter)iter.next();  
    ImageWriteParam iwp = writer.getDefaultWriteParam(); 
    BufferedImage originalImage = ImageIO.read(new ByteArrayInputStream(inputImageBytes)); 
    IIOImage image = new IIOImage(originalImage, null, null);
    ByteArrayOutputStream out=new ByteArrayOutputStream();
    ImageOutputStream imageOut=ImageIO.createImageOutputStream(out);
    writer.setOutput(imageOut);  
    writer.write(null, image, iwp);  
    byte[] qualityImageBytes = out.toByteArray();
    return qualityImageBytes;
}

private static void init() {

        Iterator i = ImageIO.getImageWritersByFormatName(format);
        if (!i.hasNext()) {
            throw new RuntimeException("No available ImageWrites for "+format+" format!");
        }
        iw = (ImageWriter)i.next();

        i = ImageIO.getImageReadersByFormatName(format);
        if (!i.hasNext()) {
            throw new RuntimeException("No available ImageReaders for " +format+" format!");
        }

        ir = (ImageReader)i.next();
    }

public static void main(String[] args) throws IOException {
    ImageWriter iw = new PNGImageWriter(null);
    File f = File.createTempFile("imageio", "tmp");
    ImageOutputStream ios = ImageIO.createImageOutputStream(f);
    try {
        iw.setOutput(ios);
    } catch (NullPointerException npe) {
        f.delete();
        throw new RuntimeException("Got NullPointerException!");
    }
    f.delete();
}

/**
 * Sets the default {@code Content-Type} to be used for writing.
 * @throws IllegalArgumentException if the given content type is not supported by the Java Image I/O API
 */
public void setDefaultContentType(MediaType defaultContentType) {
    Assert.notNull(defaultContentType, "'contentType' must not be null");
    Iterator<ImageWriter> imageWriters = ImageIO.getImageWritersByMIMEType(defaultContentType.toString());
    if (!imageWriters.hasNext()) {
        throw new IllegalArgumentException(
                "Content-Type [" + defaultContentType + "] is not supported by the Java Image I/O API");
    }

    this.defaultContentType = defaultContentType;
}

private boolean isWritable(MediaType mediaType) {
    if (mediaType == null || MediaType.ALL.equals(mediaType)) {
        return true;
    }
    Iterator<ImageWriter> imageWriters = ImageIO.getImageWritersByMIMEType(mediaType.toString());
    return imageWriters.hasNext();
}

private static void testGetWriterMIMETypes() {
    String[] types = ImageIO.getWriterMIMETypes();
    for (String t : types) {
        Iterator<ImageWriter> it = ImageIO.getImageWritersByMIMEType(t);
        if (!it.hasNext()) {
            throw new RuntimeException("getWriterMIMETypes returned " +
                                       "an unknown type: " + t);
        }
    }
}

/**
 * Write buffered image as required format
 *
 * @param bi
 * @param mimeType
 * @return
 * @throws IOException
 */
public byte[] writeImage(BufferedImage bi, String mimeType) throws IOException {
    Iterator<ImageWriter> writers = ImageIO.getImageWritersByMIMEType(mimeType);
    if (writers.hasNext()) {
        ImageWriter writer = writers.next();
        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        writer.setOutput(ImageIO.createImageOutputStream(baos));
        writer.write(bi);
        return baos.toByteArray();
    }
    throw new IOException("Cannot write to this mimetype");
}

public static void main(final String[] argv) throws Exception {

        IIOMetadata jpegmetadata = null;
        ImageWriter jpgWriter = ImageIO.getImageWritersByFormatName("jpg").next();
        try {
        jpegmetadata = createJPEGMetadata(jpgWriter);
        } catch (Exception e) {
            throw new RuntimeException(e);
        }

        ByteArrayOutputStream baos = new ByteArrayOutputStream();
        ImageOutputStream output = ImageIO.createImageOutputStream(baos);
        jpgWriter.setOutput(output);
        int w=100, h=100;
        BufferedImage bi = new BufferedImage(100, 100, BufferedImage.TYPE_INT_RGB);
        Graphics2D g2d = bi.createGraphics();
        g2d.setColor(Color.white);
        g2d.fillRect(0, 0, w, h);
        IIOImage image = new IIOImage(bi, null, jpegmetadata);
        jpgWriter.write(null, image, null);
        jpgWriter.dispose();

        baos.flush();
        ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
        ImageInputStream iis = ImageIO.createImageInputStream(bais);
        bi = ImageIO.read(iis);
        for (int i=0; i<bi.getWidth(); i++) {
            for(int j=0; j<bi.getHeight(); j++) {
               if (bi.getRGB(i, j) != Color.white.getRGB()) {
                   throw new RuntimeException("Wrong color : " + Integer.toHexString(bi.getRGB(i, j)));
               }
            }
        }

    }

public void imageComplete(ImageWriter source) {
    System.out.println("Image Completed");
    if (!isImageComplete) {
        isImageComplete = true;
    } else {
        throw new RuntimeException("The imageComplete() was called twice."
                                   + " Test failed.");
    }

    checkProgress();
}

public void imageProgress(ImageWriter source,
                          float percentageDone)
{
    if (20f < percentageDone && percentageDone < 80f ) {
        Thread t = new Thread(action);
        t.start();
    }
}

public DestTypeTest() {
    w = (ImageWriter)
        ImageIO.getImageWritersByFormatName("jpeg").next();
    w.addIIOWriteWarningListener(this);

    r = (ImageReader)
        ImageIO.getImageReadersByFormatName("jpeg").next();
    r.addIIOReadWarningListener(this);
}

@Override
public void imageStarted(ImageWriter source, int imageIndex) {
    System.out.println("imageStarted called");
    if (startAbort) {
        source.abort();
    }
}

public static void main(String[] args) throws IOException {
    Iterator witer = ImageIO.getImageWritersByFormatName("png");
    ImageWriter w = (ImageWriter)witer.next();

    File f = File.createTempFile("WriteProgressive", ".png");
    ImageOutputStream ios = ImageIO.createImageOutputStream(f);
    w.setOutput(ios);

    BufferedImage bi = new BufferedImage(100, 100,
                                         BufferedImage.TYPE_3BYTE_BGR);
    Graphics2D g = bi.createGraphics();
    Random r = new Random(10);
    for (int i = 0; i < 10000; i++) {
        Color c =
            new Color(r.nextInt(256), r.nextInt(256), r.nextInt(256));
        g.setColor(c);
        g.fillRect(r.nextInt(100), r.nextInt(100), 1, 1);
    }

    IIOImage iioimage = new IIOImage(bi, null, null);

    ImageWriteParam param = w.getDefaultWriteParam();
    param.setProgressiveMode(ImageWriteParam.MODE_DEFAULT);

    try {
        w.write(null, iioimage, param);
    } catch (NullPointerException npe) {
        throw new RuntimeException("Got NPE during write!");
    }

    ios.close();

    BufferedImage bi2 = ImageIO.read(f);
    f.delete();

    ImageCompare.compare(bi, bi2);
}

private static void doTest(int mode) {
    String fileFormat = "bmp";
    try {
        ImageWriter iw = (ImageWriter)ImageIO.getImageWritersBySuffix(fileFormat).next();
        if(iw == null) {
            throw new RuntimeException("No available image writer for "
                                       + fileFormat
                                       + " Test failed.");
        }

        File file = new File("image." + fileFormat);
        ImageOutputStream ios = ImageIO.createImageOutputStream(file);
        iw.setOutput(ios);

        BufferedImage bimg = new BufferedImage(100,
                                               100, BufferedImage.TYPE_INT_RGB);
        Graphics g = bimg.getGraphics();
        g.setColor(Color.green);
        g.fillRect(0,0,100,100);

        ImageWriteParam param = iw.getDefaultWriteParam();

        param.setCompressionMode(mode);

        IIOMetadata meta = iw.getDefaultImageMetadata(new ImageTypeSpecifier(bimg),
                                                      param);

        IIOImage iioImg = new IIOImage(bimg, null, meta);
        iw.write(null, iioImg, param);
    } catch(Exception e) {
        e.printStackTrace();
        throw new RuntimeException("Test failed.");
    }
}

private static void writeTo(File f, ITXtTest t) {
    BufferedImage src = createBufferedImage();
    try (ImageOutputStream imageOutputStream =
            ImageIO.createImageOutputStream(f)) {

        ImageTypeSpecifier imageTypeSpecifier =
            new ImageTypeSpecifier(src);
        ImageWriter imageWriter =
            ImageIO.getImageWritersByFormatName("PNG").next();

        imageWriter.setOutput(imageOutputStream);

        IIOMetadata m =
            imageWriter.getDefaultImageMetadata(imageTypeSpecifier, null);

        String format = m.getNativeMetadataFormatName();
        Node root = m.getAsTree(format);

        IIOMetadataNode iTXt = t.getNode();
        root.appendChild(iTXt);
        m.setFromTree(format, root);

        imageWriter.write(new IIOImage(src, null, m));
        System.out.println("Writing done.");
    } catch (Throwable e) {
        throw new RuntimeException("Writing test failed.", e);
    }
}

private File testWriteRGB(String format, int type) throws IOException {

        BufferedImage bi = new BufferedImage(width, height, type);
        Graphics2D g = bi.createGraphics();

        Color white = new Color(255, 255, 255);
        Color red = new Color(255, 0, 0);
        Color green = new Color(0, 255, 0);
        Color blue = new Color(0, 0, 255);

        g.setColor(white);
        g.fillRect(0, 0, width, height);
        g.setColor(red);
        g.fillRect(10, 10, 20, 20);
        g.setColor(green);
        g.fillRect(30, 30, 20, 20);
        g.setColor(blue);
        g.fillRect(50, 50, 20, 20);

        ImageTypeSpecifier spec = new ImageTypeSpecifier(bi);
        Iterator<ImageWriter> writers = ImageIO.getImageWriters(spec, format);
        File file = new File("BitDepth_" + biTypeNames[type] + "." + format);
        if (!writers.hasNext()) {
            System.out.println("\tNo writers available for type " + biTypeNames[type]
                               + " BufferedImage!");
        } else {
            ImageWriter writer = writers.next();
            try (ImageOutputStream out = ImageIO.createImageOutputStream(file)) {
                writer.setOutput(out);
                writer.write(bi);
            } catch (Exception e) {
                System.out.println("\tCan't write a type " +  biTypeNames[type]
                           + " BufferedImage!");
                return null;
            }
        }

        return file;
    }

private static void writeWithCompression(BufferedImage src,
                                         String compression) throws IOException
{
    System.out.println("Compression: " + compression);
    ImageWriter writer = ImageIO.getImageWritersByFormatName("BMP").next();
    if (writer == null) {
        throw new RuntimeException("Test failed: no bmp writer available");
    }
    File fout = File.createTempFile(compression + "_", ".bmp",
                                    new File("."));

    ImageOutputStream ios = ImageIO.createImageOutputStream(fout);
    writer.setOutput(ios);

    BMPImageWriteParam param = (BMPImageWriteParam)
            writer.getDefaultWriteParam();
    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    param.setCompressionType(compression);
    param.setTopDown(true);
    writer.write(null, new IIOImage(src, null, null), param);
    writer.dispose();
    ios.flush();
    ios.close();

    BufferedImage dst = ImageIO.read(fout);

    verify(dst);
}

/** Checks that the provided <code>ImageWriter</code> can encode
 * the provided <code>ImageTypeSpecifier</code> or not.  If not, an
 * <code>IIOException</code> will be thrown.
 * @param writer The provided <code>ImageWriter</code>.
 * @param type The image to be tested.
 * @throws IIOException If the writer cannot encoded the provided image.
 */
public static final void canEncodeImage(ImageWriter writer,
                                        ImageTypeSpecifier type)
    throws IIOException {
    ImageWriterSpi spi = writer.getOriginatingProvider();

    if(type != null && spi != null && !spi.canEncodeImage(type))  {
        throw new IIOException(I18N.getString("ImageUtil2")+" "+
                               writer.getClass().getName());
    }
}

protected void doTest() throws IOException {
    BufferedImage biSrc = getSrc();

    ImageWriter writer = ImageIO.getImageWritersByFormatName("GIF").next();
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
    writer.setOutput(ios);

    ImageWriteParam writeParam = writer.getDefaultWriteParam();
    IIOMetadata imageMetadata =
        writer.getDefaultImageMetadata(new ImageTypeSpecifier(biSrc), writeParam);

    IIOMetadata streamMetadata = writer.getDefaultStreamMetadata(writeParam);

    IIOImage iioImg = new IIOImage(biSrc, null, imageMetadata);
    writer.write(streamMetadata, iioImg, writeParam);
    ios.close();

    ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());
    ImageInputStream iis = ImageIO.createImageInputStream(bais);
    ImageReader reader = ImageIO.getImageReader(writer);
    reader.setInput(iis);
    BufferedImage dst = reader.read(0);

    // do test
    int x = dx / 2;
    int y = height / 2;

    for (int i = 0; i < usedColors.length; i++) {
        int dstRgb = dst.getRGB(x, y);
        System.out.println("dstColor: " + Integer.toHexString(dstRgb));
        int srcRgb = usedColors[i].getRGB();
        System.out.println("srcColor: " + Integer.toHexString(srcRgb));
        if (dstRgb != srcRgb) {
            throw new RuntimeException("wrong color " + i + ": " + Integer.toHexString(dstRgb));
        }
        x += dx;
    }

}

public static void main(final String[] args) throws Exception {
    final IIORegistry registry = IIORegistry.getDefaultInstance();
    final Iterator<ImageWriterSpi> iter =
            registry.getServiceProviders(ImageWriterSpi.class,
                    provider -> true, true);
    // Validates all supported ImageWriters
    while (iter.hasNext()) {
        final ImageWriter writer = iter.next().createWriterInstance();
        System.out.println("ImageWriter = " + writer);
        test(writer);
    }
    System.out.println("Test passed");
}

public void imageProgress(ImageWriter source,
                          float percentageDone) {
    print("imageProgress: percentageDone = " + percentageDone);

    if (state != IMAGE_STARTED) {
        error("imageProgress called without prior imageStarted!");
    }
    if (percentageDone < prevPercentageDone) {
        error("percentageDone did not increase!");
    }
    prevPercentageDone = percentageDone;
}

@Override
public void imageProgress(ImageWriter source, float percentageDone) {
    isProgressCalled = true;
    if (percentageDone > 50 && abortFlag) {
        source.abort();
    }
}

private static void writeWithCompression(BufferedImage src,
                                         String compression) throws IOException
{
    System.out.println("Compression: " + compression);
    ImageWriter writer = ImageIO.getImageWritersByFormatName("BMP").next();
    if (writer == null) {
        throw new RuntimeException("Test failed: no bmp writer available");
    }
    File fout = File.createTempFile(compression + "_", ".bmp",
                                    new File("."));

    ImageOutputStream ios = ImageIO.createImageOutputStream(fout);
    writer.setOutput(ios);

    BMPImageWriteParam param = (BMPImageWriteParam)
            writer.getDefaultWriteParam();
    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    param.setCompressionType(compression);
    param.setTopDown(true);
    writer.write(null, new IIOImage(src, null, null), param);
    writer.dispose();
    ios.flush();
    ios.close();

    BufferedImage dst = ImageIO.read(fout);

    verify(dst);
}

public static void main(final String[] args) throws IOException {
    final IIORegistry registry = IIORegistry.getDefaultInstance();
    final Iterator<ImageWriterSpi> iter = registry.getServiceProviders(
            ImageWriterSpi.class, provider -> true, true);

    // Validates all supported ImageWriters
    while (iter.hasNext()) {
        final WriteAfterAbort writeAfterAbort = new WriteAfterAbort();
        final ImageWriter writer = iter.next().createWriterInstance();
        System.out.println("ImageWriter = " + writer);
        writeAfterAbort.test(writer);
    }
    System.out.println("Test passed");
}

public static void writeTestImage(String fileName) {
    BufferedImage bi =
        new BufferedImage(TEST_W, TEST_H, BufferedImage.TYPE_INT_RGB);
    Graphics g = bi.getGraphics();
    g.setColor(new Color(testRGB));
    g.fillRect(0, 0, TEST_W, TEST_H);
    try {
        System.err.printf("Writing %s\n", fileName);
        if (lowCompression) {
            ImageWriter iw = (ImageWriter)ImageIO.getImageWritersBySuffix("jpeg").next();
            if(iw == null) {
                throw new RuntimeException("No available image writer for "
                                           + "jpeg "
                                           + " Test failed.");
            }

            File file = new File(fileName);
            ImageOutputStream ios = ImageIO.createImageOutputStream(file);
            iw.setOutput(ios);

            ImageWriteParam param = iw.getDefaultWriteParam();
            param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
            param.setCompressionQuality(1);

            IIOImage iioImg = new IIOImage(bi, null, null);
            iw.write(null, iioImg, param);

        } else {
            ImageIO.write(bi, "jpeg", new File(fileName));
        }
    } catch (IOException e) {
        System.err.println("Error " + e +
                           " when writing file: " + fileName);
        throw new RuntimeException(e);
    }
}