Java 类javax.imageio.ImageWriteParam 实例源码

public void write(IIOMetadata sm,
                  IIOImage iioimage,
                  ImageWriteParam p) throws IOException {
    if (stream == null) {
        throw new IllegalStateException("output == null!");
    }
    if (iioimage == null) {
        throw new IllegalArgumentException("iioimage == null!");
    }
    if (iioimage.hasRaster()) {
        throw new UnsupportedOperationException("canWriteRasters() == false!");
    }

    resetLocal();

    GIFWritableStreamMetadata streamMetadata;
    if (sm == null) {
        streamMetadata =
            (GIFWritableStreamMetadata)getDefaultStreamMetadata(p);
    } else {
        streamMetadata =
            (GIFWritableStreamMetadata)convertStreamMetadata(sm, p);
    }

    write(true, true, streamMetadata, iioimage, p);
}

private static long saveImage(final BufferedImage image,
                              final ImageWriter writer,
                              final ImageWriteParam writerParams,
                              final String mode,
                              final String suffix) throws IOException
{
    final File imgFile = new File("WriterCompressionTest-"
                                  + mode + '.' + suffix);
    System.out.println("Writing file: " + imgFile.getAbsolutePath());

    final ImageOutputStream imgOutStream
        = ImageIO.createImageOutputStream(new FileOutputStream(imgFile));
    try {
        writer.setOutput(imgOutStream);
        writer.write(null, new IIOImage(image, null, null), writerParams);
    } finally {
        imgOutStream.close();
    }
    return imgFile.length();
}

public byte[] writeTest(BufferedImage bi,
                        ImageWriteParam p,
                        IIOMetadata m) throws IOException {
    ByteArrayOutputStream baos =
        new ByteArrayOutputStream();

    // write test image as jpeg
    ImageOutputStream ios =
        ImageIO.createImageOutputStream(baos);
    w.setOutput(ios);
    w.write(null,
            new IIOImage(bi, null, m),
            p);
    ios.close();
    return baos.toByteArray();
}

public static void writeJPG( BufferedImage rendered, float quality, File f ) {

        try {
            JPEGImageWriteParam jpegParams = new JPEGImageWriteParam( null );
            jpegParams.setCompressionMode( ImageWriteParam.MODE_EXPLICIT );
            jpegParams.setCompressionQuality( 1f );

            ImageWriter writer = ImageIO.getImageWritersByFormatName( "jpeg" ).next();
            ImageWriteParam param = writer.getDefaultWriteParam();
            param.setCompressionMode( ImageWriteParam.MODE_EXPLICIT ); // Needed see javadoc
            param.setCompressionQuality( quality ); // Highest quality
            writer.setOutput( new FileImageOutputStream( f ) );
            writer.write( null, new IIOImage( rendered, null, null ), jpegParams );
        } catch ( Throwable th ) {
            th.printStackTrace();
        }
    }

private boolean jfifOK(ImageTypeSpecifier imageType,
                       ImageWriteParam param,
                       IIOMetadata streamMetadata,
                       IIOMetadata imageMetadata) {
    // If the image type and metadata are JFIF compatible, return true
    if ((imageType != null) &&
        (!JPEG.isJFIFcompliant(imageType, true))) {
        return false;
    }
    if (imageMetadata != null) {
        JPEGMetadata metadata = null;
        if (imageMetadata instanceof JPEGMetadata) {
            metadata = (JPEGMetadata) imageMetadata;
        } else {
            metadata = (JPEGMetadata)convertImageMetadata(imageMetadata,
                                                          imageType,
                                                          param);
        }
        // metadata must have a jfif node
        if (metadata.findMarkerSegment
            (JFIFMarkerSegment.class, true) == null){
            return false;
        }
    }
    return true;
}

private static void encodeRLE8Test() throws IOException {
    // create 8bpp image
    byte[] r = new byte[256];
    r[0] = (byte)0xff;
    byte[] g = new byte[256];
    g[1] = (byte)0xff;
    byte[] b = new byte[256];
    b[2] = (byte)0xff;
    IndexColorModel icm = new IndexColorModel(8, 256, r, g, b);

    BufferedImage bimg = new BufferedImage(100, 100,
                                           BufferedImage.TYPE_BYTE_INDEXED,
                                           icm);
    Graphics gr = bimg.getGraphics();
    gr.setColor(Color.green);
    gr.fillRect(0, 0, 100, 100);

    doTest(bimg, "BI_RLE8", ImageWriteParam.MODE_EXPLICIT);
}

/**
 * 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();
}

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);
}

private boolean jfifOK(ImageTypeSpecifier imageType,
                       ImageWriteParam param,
                       IIOMetadata streamMetadata,
                       IIOMetadata imageMetadata) {
    // If the image type and metadata are JFIF compatible, return true
    if ((imageType != null) &&
        (!JPEG.isJFIFcompliant(imageType, true))) {
        return false;
    }
    if (imageMetadata != null) {
        JPEGMetadata metadata = null;
        if (imageMetadata instanceof JPEGMetadata) {
            metadata = (JPEGMetadata) imageMetadata;
        } else {
            metadata = (JPEGMetadata)convertImageMetadata(imageMetadata,
                                                          imageType,
                                                          param);
        }
        // metadata must have a jfif node
        if (metadata.findMarkerSegment
            (JFIFMarkerSegment.class, true) == null){
            return false;
        }
    }
    return true;
}

public void writeToSequence(IIOImage image, ImageWriteParam param)
  throws IOException {
    if (stream == null) {
        throw new IllegalStateException("output == null!");
    }
    if (image == null) {
        throw new IllegalArgumentException("image == null!");
    }
    if (image.hasRaster()) {
        throw new UnsupportedOperationException("canWriteRasters() == false!");
    }
    if (!isWritingSequence) {
        throw new IllegalStateException("prepareWriteSequence() was not invoked!");
    }

    write(!wroteSequenceHeader, false, theStreamMetadata,
          image, param);

    if (!wroteSequenceHeader) {
        wroteSequenceHeader = true;
    }

    this.imageIndex++;
}

protected File writeImageWithHist(BufferedImage bi) throws IOException {
    File f = File.createTempFile("hist_", ".png", new File("."));

    ImageWriter writer = ImageIO.getImageWritersByFormatName("PNG").next();

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

    ImageWriteParam param = writer.getDefaultWriteParam();
    ImageTypeSpecifier type = new ImageTypeSpecifier(bi);

    IIOMetadata imgMetadata = writer.getDefaultImageMetadata(type, param);

    /* add hIST node to image metadata */
    imgMetadata = upgradeMetadata(imgMetadata, bi);

    IIOImage iio_img = new IIOImage(bi,
                                    null, // no thumbnails
                                    imgMetadata);

    writer.write(iio_img);
    ios.flush();
    ios.close();
    return f;
}

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 TIFFDeflater(String compressionType,
                    int compressionTagValue,
                    ImageWriteParam param,
                    int predictorValue) {
    super(compressionType, compressionTagValue, true);

    this.predictor = predictorValue;

    // Set the deflate level.
    int deflateLevel;
    if(param != null &&
       param.getCompressionMode() == ImageWriteParam.MODE_EXPLICIT) {
        float quality = param.getCompressionQuality();
        deflateLevel = (int)(1 + 8*quality);
    } else {
        deflateLevel = Deflater.DEFAULT_COMPRESSION;
    }

    this.deflater = new Deflater(deflateLevel);
}

/**
 * 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 static void main(String args[]) {
    int[] iModes = { ImageWriteParam.MODE_DISABLED,
                     ImageWriteParam.MODE_EXPLICIT,
                     ImageWriteParam.MODE_COPY_FROM_METADATA,
                     ImageWriteParam.MODE_DEFAULT };

    String[] strModes = { "ImageWriteParam.MODE_DISABLED",
                          "ImageWriteParam.MODE_EXPLICIT",
                          "ImageWriteParam.MODE_COPY_FROM_METADATA",
                          "ImageWriteParam.MODE_DEFAULT" };

    for(int i=0; i<iModes.length; i++) {
        System.out.println("Test compression mode "+strModes[i]);
        doTest(iModes[i]);
    }
}

public ImageCompressionTypesTest(String format) {
    Iterator it = ImageIO.getImageWritersByFormatName(format);
    while (it.hasNext()) {
        writer = (ImageWriter) it.next();
        break;
    }
    ImageWriteParam param = writer.getDefaultWriteParam();

    param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    System.out.println("Checking compression types for : " + format);
    String compTypes[] = param.getCompressionTypes();
    if (compTypes.length > 1) {
        for (int i = 0; i < compTypes.length; i++) {
            for (int j = i + 1; j < compTypes.length; j++) {
                if (compTypes[i].equalsIgnoreCase(compTypes[j])) {
                    throw new RuntimeException("Duplicate compression"
                            + " type exists for image format " + format);
                }
            }
        }
    }
}

public static void main(String[] args) {
    ImageWriteParam iwp = new JPEGImageWriteParam(null);
    iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    float[] vals = iwp.getCompressionQualityValues();
    String[] descs = iwp.getCompressionQualityDescriptions();
    if (vals.length != (descs.length + 1)) {
        throw new RuntimeException("Test failed: Values array is not " +
                                   "one larger than descriptions array");
    }
}

@Override
public BufferedImage apply(BufferedImage img) {

    if(compressionLevel == 0f)
        return img;

    try {
        ImageWriter iw = ImageIO.getImageWritersByFormatName("jpeg").next();
        JPEGImageWriteParam iwp = (JPEGImageWriteParam) iw.getDefaultWriteParam();
        iwp.setOptimizeHuffmanTables(false);
        iwp.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        iwp.setProgressiveMode(ImageWriteParam.MODE_DISABLED);
        iwp.setCompressionQuality(1f-compressionLevel);


        ByteArrayOutputStream baos = new ByteArrayOutputStream(); 
        iw.setOutput(new MemoryCacheImageOutputStream(baos)); 

        IIOImage outputImage = new IIOImage(img, null, null);
        iw.write(null, outputImage, iwp);
        iw.dispose();

        baos.flush(); 
        byte[] returnImage = baos.toByteArray(); 
        baos.close();


        BufferedImage img2 = ImageIO.read(new ByteArrayInputStream(returnImage));

        if(img2 == null)
            throw new Exception();
        else
            img = img2;

    } catch (Exception e) {
        e.printStackTrace();
    }

    return img;
}

/**
    * Reads the original image, creates a resized copy of it and returns its input stream. largestDimension is the
    * largest dimension of the resized image, the other dimension is scaled accordingly.
    *
    * @param image
    *            original image
    * @param largestDimension
    *            the largest dimension of the resized image, the other dimension is scaled accordingly
    * @return
    * @throws IOException
    * @throws UploadImageGalleryFileException
    */
   public static InputStream resize(BufferedImage image, int largestDimension) throws IOException {
try {
    //resize to 150 pixels max
    BufferedImage outImage = Scalr.resize(image, Method.QUALITY, largestDimension);

    //set jpeg compression quality explicitly
    ImageWriter imageWriter = ImageIO.getImageWritersByFormatName("jpeg").next();
    ImageWriteParam jpgWriteParam = imageWriter.getDefaultWriteParam();
    jpgWriteParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    jpgWriteParam.setCompressionQuality(.95f);

    // buffer all data in a circular buffer of infinite sizes
    CircularByteBuffer outputBuffer = new CircularByteBuffer(CircularByteBuffer.INFINITE_SIZE);
    ImageOutputStream ios = ImageIO.createImageOutputStream(outputBuffer.getOutputStream());
    imageWriter.setOutput(ios);
    IIOImage outputImage = new IIOImage(outImage, null, null);
    imageWriter.write(null, outputImage, jpgWriteParam);
    imageWriter.dispose();
    outputBuffer.getOutputStream().close();

    return outputBuffer.getInputStream();

} catch (IOException e) {
    log.error(e.getStackTrace());
    return null;
}
   }

public IIOMetadata
    getDefaultImageMetadata(ImageTypeSpecifier imageType,
                            ImageWriteParam param) {
    setThreadLock();
    try {
        return new JPEGMetadata(imageType, param, this);
    } finally {
        clearThreadLock();
    }
}

public IIOMetadata convertStreamMetadata(IIOMetadata inData,
                                         ImageWriteParam param) {
    // There isn't much we can do.  If it's one of ours, then
    // return it.  Otherwise just return null.  We use it only
    // for tables, so we can't get a default and modify it,
    // as this will usually not be what is intended.
    if (inData instanceof JPEGMetadata) {
        JPEGMetadata jpegData = (JPEGMetadata) inData;
        if (jpegData.isStream) {
            return inData;
        }
    }
    return null;
}

public IIOMetadata
    convertImageMetadata(IIOMetadata inData,
                         ImageTypeSpecifier imageType,
                         ImageWriteParam param) {
    setThreadLock();
    try {
        return convertImageMetadataOnThread(inData, imageType, param);
    } finally {
        clearThreadLock();
    }
}

public int getNumThumbnailsSupported(ImageTypeSpecifier imageType,
                                     ImageWriteParam param,
                                     IIOMetadata streamMetadata,
                                     IIOMetadata imageMetadata) {
    if (jfifOK(imageType, param, streamMetadata, imageMetadata)) {
        return Integer.MAX_VALUE;
    }
    return 0;
}

public void doTest(int type) throws IOException {
    BufferedImage src = getTestImage(type);

    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageOutputStream ios = ImageIO.createImageOutputStream(baos);

    ImageWriter writer = ImageIO.getImageWritersByFormatName("BMP").next();
    writer.setOutput(ios);

    ImageWriteParam wparam = writer.getDefaultWriteParam();
    wparam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
    switch(type) {
        case TEST_RLE8:
            wparam.setCompressionType("BI_RLE8");
            break;
        case TEST_RLE4:
            wparam.setCompressionType("BI_RLE4");
            break;
        default:
            throw new IllegalArgumentException("Wrong test type: " + type);
    }

    writer.write(null, new IIOImage(src, null, null), wparam);

    ios.close();
    baos.close();

    // read result
    ByteArrayInputStream bais = new ByteArrayInputStream(baos.toByteArray());

    BufferedImage dst = ImageIO.read(bais);

    checkResult(src, dst);
}

public void write(IIOMetadata streamMetadata,
                  IIOImage image,
                  ImageWriteParam param) throws IOException {
    setThreadLock();
    try {
        cbLock.check();

        writeOnThread(streamMetadata, image, param);
    } finally {
        clearThreadLock();
    }
}

/**
 * Creates a default stream metadata object and merges in the
 * supplied metadata.
 */
public IIOMetadata convertStreamMetadata(IIOMetadata inData,
                                         ImageWriteParam param) {
    if (inData == null) {
        throw new IllegalArgumentException("inData == null!");
    }

    IIOMetadata sm = getDefaultStreamMetadata(param);

    convertMetadata(STREAM_METADATA_NAME, inData, sm);

    return sm;
}

/**
 * Creates a default image metadata object and merges in the
 * supplied metadata.
 */
public IIOMetadata convertImageMetadata(IIOMetadata inData,
                                        ImageTypeSpecifier imageType,
                                        ImageWriteParam param) {
    if (inData == null) {
        throw new IllegalArgumentException("inData == null!");
    }
    if (imageType == null) {
        throw new IllegalArgumentException("imageType == null!");
    }

    GIFWritableImageMetadata im =
        (GIFWritableImageMetadata)getDefaultImageMetadata(imageType,
                                                          param);

    // Save interlace flag state.

    boolean isProgressive = im.interlaceFlag;

    convertMetadata(IMAGE_METADATA_NAME, inData, im);

    // Undo change to interlace flag if not MODE_COPY_FROM_METADATA.

    if (param != null && param.canWriteProgressive() &&
        param.getProgressiveMode() != param.MODE_COPY_FROM_METADATA) {
        im.interlaceFlag = isProgressive;
    }

    return im;
}

private static void test4434886() {
    ImageWriteParam iwp = new ImageWriteParam4434886();
    iwp.setTilingMode(ImageWriteParam.MODE_EXPLICIT);
    try {
        iwp.setTiling(-1,-2,-3,-4);
        throw new RuntimeException("Failed to get IAE!");
    } catch (IllegalArgumentException e) {
    }
}

public static void main(String[] args) {
    try {
        AnimationTest t = new AnimationTest();
        t.initFrame();

        ImageWriter w = t.initWriter();

        ImageWriteParam p = w.getDefaultWriteParam();

        IIOMetadata streamMetadata = w.getDefaultStreamMetadata(p);

        w.prepareWriteSequence(streamMetadata);

        for (int i = 0; i < 50; i++) {
            BufferedImage f = t.createNextFrame();

            ImageTypeSpecifier type = new ImageTypeSpecifier(f);

            IIOMetadata m = w.getDefaultImageMetadata(type, p);

            w.writeToSequence(new IIOImage(f, null, m), p);
        }
        w.endWriteSequence();

        t.checkAnimation();
    } catch (Exception e) {
        throw new RuntimeException("Test failed.", e);
    }
}

private static void test4441315() {
    ImageWriteParam iwp = new ImageWriteParam4441315();
    try {
        iwp.setProgressiveMode(ImageWriteParam.MODE_EXPLICIT);
        throw new RuntimeException("Failed to get IAE!");
    } catch (IllegalArgumentException e) {
    }
}

private static void test4434870() {
    ImageWriteParam iwp = new ImageWriteParam4434870();
    try {
        Dimension[] dimensions = iwp.getPreferredTileSizes();
        iwp.setTilingMode(ImageWriteParam.MODE_EXPLICIT);
        iwp.setTiling(100, 100, 0,0);
        throw new RuntimeException("Failed to get IAE!");
    } catch (IllegalArgumentException e) {
    }
}

public IIOMetadata convertImageMetadata(IIOMetadata inData,
                                        ImageTypeSpecifier imageType,
                                        ImageWriteParam param) {
    // TODO - deal with imageType
    if (inData instanceof PNGMetadata) {
        return (PNGMetadata)((PNGMetadata)inData).clone();
    } else {
        return new PNGMetadata(inData);
    }
}

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.");
    }
}

public IIOMetadata
    getDefaultImageMetadata(ImageTypeSpecifier imageType,
                            ImageWriteParam param) {
    setThreadLock();
    try {
        return new JPEGMetadata(imageType, param, this);
    } finally {
        clearThreadLock();
    }
}

public IIOMetadata convertStreamMetadata(IIOMetadata inData,
                                         ImageWriteParam param) {
    // There isn't much we can do.  If it's one of ours, then
    // return it.  Otherwise just return null.  We use it only
    // for tables, so we can't get a default and modify it,
    // as this will usually not be what is intended.
    if (inData instanceof JPEGMetadata) {
        JPEGMetadata jpegData = (JPEGMetadata) inData;
        if (jpegData.isStream) {
            return inData;
        }
    }
    return null;
}

public IIOMetadata
    convertImageMetadata(IIOMetadata inData,
                         ImageTypeSpecifier imageType,
                         ImageWriteParam param) {
    setThreadLock();
    try {
        return convertImageMetadataOnThread(inData, imageType, param);
    } finally {
        clearThreadLock();
    }
}

public Dimension[] getPreferredThumbnailSizes(ImageTypeSpecifier imageType,
                                              ImageWriteParam param,
                                              IIOMetadata streamMetadata,
                                              IIOMetadata imageMetadata) {
    if (jfifOK(imageType, param, streamMetadata, imageMetadata)) {
        return (Dimension [])preferredThumbSizes.clone();
    }
    return null;
}

public void writeToSequence(IIOImage image, ImageWriteParam param)
    throws IOException {
    setThreadLock();
    try {
        cbLock.check();

        if (sequencePrepared == false) {
            throw new IllegalStateException("sequencePrepared not called!");
        }
        // In the case of JPEG this does nothing different from write
        write(null, image, param);
    } finally {
        clearThreadLock();
    }
}

/**
 * Creates a default stream metadata object and merges in the
 * supplied metadata.
 */
public IIOMetadata convertStreamMetadata(IIOMetadata inData,
                                         ImageWriteParam param) {
    if (inData == null) {
        throw new IllegalArgumentException("inData == null!");
    }

    IIOMetadata sm = getDefaultStreamMetadata(param);

    convertMetadata(STREAM_METADATA_NAME, inData, sm);

    return sm;
}

/**
 * Creates a default image metadata object and merges in the
 * supplied metadata.
 */
public IIOMetadata convertImageMetadata(IIOMetadata inData,
                                        ImageTypeSpecifier imageType,
                                        ImageWriteParam param) {
    if (inData == null) {
        throw new IllegalArgumentException("inData == null!");
    }
    if (imageType == null) {
        throw new IllegalArgumentException("imageType == null!");
    }

    GIFWritableImageMetadata im =
        (GIFWritableImageMetadata)getDefaultImageMetadata(imageType,
                                                          param);

    // Save interlace flag state.

    boolean isProgressive = im.interlaceFlag;

    convertMetadata(IMAGE_METADATA_NAME, inData, im);

    // Undo change to interlace flag if not MODE_COPY_FROM_METADATA.

    if (param != null && param.canWriteProgressive() &&
        param.getProgressiveMode() != param.MODE_COPY_FROM_METADATA) {
        im.interlaceFlag = isProgressive;
    }

    return im;
}