javax.imageio.ImageWriter#prepareWriteSequence ( )源码实例Demo

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");
}
 

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");
}
 

private static void test(final ImageWriter writer) throws Exception {
    final File file = File.createTempFile("temp", ".img");
    file.deleteOnExit();
    final FileOutputStream fos = new FileOutputStream(file);
    final ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
    writer.setOutput(ios);
    final IIOMetadata data = writer.getDefaultStreamMetadata(null);

    if (writer.canWriteSequence()) {
        writer.prepareWriteSequence(data);
    } else {
        try {
            writer.prepareWriteSequence(data);
            throw new RuntimeException(
                    "UnsupportedOperationException was not thrown");
        } catch (final UnsupportedOperationException ignored) {
            // expected
        }
    }
    writer.dispose();
    ios.close();
}
 

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 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.");
    }
}
 

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");
}
 

private static void test(final ImageWriter writer) throws Exception {
    final File file = File.createTempFile("temp", ".img");
    file.deleteOnExit();
    final FileOutputStream fos = new FileOutputStream(file);
    final ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
    writer.setOutput(ios);
    final IIOMetadata data = writer.getDefaultStreamMetadata(null);

    if (writer.canWriteSequence()) {
        writer.prepareWriteSequence(data);
    } else {
        try {
            writer.prepareWriteSequence(data);
            throw new RuntimeException(
                    "UnsupportedOperationException was not thrown");
        } catch (final UnsupportedOperationException ignored) {
            // expected
        }
    }
    writer.dispose();
    ios.close();
}
 

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");
}
 

private static void test(final ImageWriter writer) throws Exception {
    final File file = File.createTempFile("temp", ".img");
    file.deleteOnExit();
    final FileOutputStream fos = new FileOutputStream(file);
    final ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
    writer.setOutput(ios);
    final IIOMetadata data = writer.getDefaultStreamMetadata(null);

    if (writer.canWriteSequence()) {
        writer.prepareWriteSequence(data);
    } else {
        try {
            writer.prepareWriteSequence(data);
            throw new RuntimeException(
                    "UnsupportedOperationException was not thrown");
        } catch (final UnsupportedOperationException ignored) {
            // expected
        }
    }
    writer.dispose();
    ios.close();
}
 

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");
}
 

private static void test(final ImageWriter writer) throws Exception {
    final File file = File.createTempFile("temp", ".img");
    file.deleteOnExit();
    final FileOutputStream fos = new FileOutputStream(file);
    final ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
    writer.setOutput(ios);
    final IIOMetadata data = writer.getDefaultStreamMetadata(null);

    if (writer.canWriteSequence()) {
        writer.prepareWriteSequence(data);
    } else {
        try {
            writer.prepareWriteSequence(data);
            throw new RuntimeException(
                    "UnsupportedOperationException was not thrown");
        } catch (final UnsupportedOperationException ignored) {
            // expected
        }
    }
    writer.dispose();
    ios.close();
}
 

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.");
    }
}
 

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");
}
 

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");
}
 

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");
}
 

private void exportAnimation(String delayTime, File file, ProgressMonitor pm) {

        ImageWriter imageWriter = ImageIO.getImageWritersByFormatName("gif").next();

        try {
            ImageOutputStream outputStream = ImageIO.createImageOutputStream(file);
            imageWriter.setOutput(outputStream);
            imageWriter.prepareWriteSequence(null);

            pm.beginTask("Exporting time series as animated gif", frames.length);

            for (int i = 0; i < frames.length; i++) {
                RenderedImage currentImage = frames[i];
                ImageWriteParam writeParameters = imageWriter.getDefaultWriteParam();
                IIOMetadata metadata = imageWriter.getDefaultImageMetadata(new ImageTypeSpecifier(currentImage),
                                                                           writeParameters);

                configure(metadata, delayTime, i);
                IIOImage image = new IIOImage(currentImage, null, metadata);
                imageWriter.writeToSequence(image, null);
                pm.worked(1);
            }
            imageWriter.endWriteSequence();
            outputStream.close();
            pm.done();
        } catch (IOException e) {
            SnapApp.getDefault().handleError("Unable to create animated gif", 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);
    }
}
 

public static void toGif(
    String path, List<BufferedImage> frames, int delayTime, boolean override) {
  if (Utils.isBlank(path) || frames == null || frames.size() == 0) return;
  Iterator<ImageWriter> it = ImageIO.getImageWritersByFormatName("gif");
  try {
    File file = new File(path);
    if (override) {
      file.deleteOnExit();
    }

    ImageWriter writer = it.hasNext() ? it.next() : null;
    ImageOutputStream stream = ImageIO.createImageOutputStream(file);
    if (Objects.isNull(writer)) {
      throw new IOException();
    }
    writer.setOutput(stream);
    writer.prepareWriteSequence(null);

    IIOMetadataNode gce = new IIOMetadataNode("GraphicControlExtension");
    gce.setAttribute("disposalMethod", "none");
    gce.setAttribute("userInputFlag", "FALSE");
    gce.setAttribute("transparentColorFlag", "FALSE");
    gce.setAttribute("transparentColorIndex", "0");
    gce.setAttribute("delayTime", Objects.toString(delayTime));

    IIOMetadataNode ae = new IIOMetadataNode("ApplicationExtension");
    ae.setAttribute("applicationID", "NETSCAPE");
    ae.setAttribute("authenticationCode", "2.0");
    ae.setUserObject(new byte[] {0x1, 0x0, 0x0});

    IIOMetadataNode aes = new IIOMetadataNode("ApplicationExtensions");
    aes.appendChild(ae);

    for (BufferedImage image : frames) {
      ImageWriteParam iwp = writer.getDefaultWriteParam();
      IIOMetadata metadata = writer.getDefaultImageMetadata(new ImageTypeSpecifier(image), iwp);
      String metaFormat = metadata.getNativeMetadataFormatName();
      Node root = metadata.getAsTree(metaFormat);
      root.appendChild(gce);
      root.appendChild(aes);
      metadata.setFromTree(metaFormat, root);
      writer.writeToSequence(new IIOImage(image, null, metadata), null);
      metadata = null;
    }
    writer.endWriteSequence();
    stream.close();
  } catch (IOException ex) {
    ex.printStackTrace();
  }
}
 

public static void doTest(boolean writeSequence) throws IOException {
    String format = "GIF";
    ImageWriter writer =
            ImageIO.getImageWritersByFormatName(format).next();
    if (writer == null) {
        throw new RuntimeException("No writer available for " + format);
    }

    BufferedImage img = createTestImage();
    ByteArrayOutputStream baos = new ByteArrayOutputStream();
    ImageOutputStream ios = ImageIO.createImageOutputStream(baos);
    writer.setOutput(ios);

    WriterReuseTest t = new WriterReuseTest();
    writer.addIIOWriteProgressListener(t);

    ImageWriteParam param = writer.getDefaultWriteParam();
    IIOMetadata streamMetadata = writer.getDefaultStreamMetadata(param);
    IIOImage iioImg = new IIOImage(img, null, null);
    if (writeSequence) {
        writer.prepareWriteSequence(streamMetadata);
        writer.writeToSequence(iioImg, param);
    } else {
        writer.write(img);
    }

    if (!t.isWritingAborted || t.isWritingCompleted) {
        throw new RuntimeException("Test failed.");
    }
    t.reset();

    // next attempt after abort
    ImageOutputStream ios2 =
         ImageIO.createImageOutputStream(new ByteArrayOutputStream());
    writer.setOutput(ios2);
    if (writeSequence) {
        writer.writeToSequence(iioImg, param);
    } else {
        writer.write(img);
    }

    if (t.isWritingAborted || !t.isWritingCompleted) {
        throw new RuntimeException("Test failed.");
    }
    System.out.println("Test passed.");
}
 

private void test(final ImageWriter writer) throws IOException {
    String suffix = writer.getOriginatingProvider().getFileSuffixes()[0];

    // Image initialization
    BufferedImage imageUpperLeft =
            new BufferedImage(WIDTH, HEIGHT, TYPE_BYTE_BINARY);
    Graphics2D g = imageUpperLeft.createGraphics();
    g.setColor(Color.WHITE);
    g.fillRect(0, 0, WIDTH/2, HEIGHT/2);
    g.dispose();
    BufferedImage imageLowerRight =
            new BufferedImage(WIDTH, HEIGHT, TYPE_BYTE_BINARY);
    g = imageLowerRight.createGraphics();
    g.setColor(Color.WHITE);
    g.fillRect(WIDTH/2, HEIGHT/2, WIDTH/2, HEIGHT/2);
    g.dispose();
    TiledImage[] images = new TiledImage[] {
        new TiledImage(imageUpperLeft, NUM_TILES_XY, NUM_TILES_XY),
        new TiledImage(imageUpperLeft, NUM_TILES_XY, NUM_TILES_XY),
        new TiledImage(imageLowerRight, NUM_TILES_XY, NUM_TILES_XY),
        new TiledImage(imageLowerRight, NUM_TILES_XY, NUM_TILES_XY)
    };

    // File initialization
    File file = File.createTempFile("temp", "." + suffix);
    file.deleteOnExit();
    FileOutputStream fos = new SkipWriteOnAbortOutputStream(file);
    ImageOutputStream ios = ImageIO.createImageOutputStream(fos);
    writer.setOutput(ios);
    writer.addIIOWriteProgressListener(this);

    writer.prepareWriteSequence(null);
    boolean[] abortions = new boolean[] {true, false, true, false};
    for (int i = 0; i < 4; i++) {
        abortFlag = abortions[i];
        isAbortCalled = false;
        isCompleteCalled = false;
        isProgressCalled = false;
        isStartedCalled = false;

        TiledImage image = images[i];
        if (abortFlag) {
            // This write will be aborted, and file will not be touched
            writer.writeToSequence(new IIOImage(image, null, null), null);
            if (!isStartedCalled) {
                throw new RuntimeException("Started should be called");
            }
            if (!isProgressCalled) {
                throw new RuntimeException("Progress should be called");
            }
            if (!isAbortCalled) {
                throw new RuntimeException("Abort should be called");
            }
            if (isCompleteCalled) {
                throw new RuntimeException("Complete should not be called");
            }
        } else {
            // This write should be completed successfully and the file should
            // contain correct image data.
            writer.writeToSequence(new IIOImage(image, null, null), null);
            if (!isStartedCalled) {
                throw new RuntimeException("Started should be called");
            }
            if (!isProgressCalled) {
                throw new RuntimeException("Progress should be called");
            }
            if (isAbortCalled) {
                throw new RuntimeException("Abort should not be called");
            }
            if (!isCompleteCalled) {
                throw new RuntimeException("Complete should be called");
            }
        }
    }

    writer.endWriteSequence();
    writer.dispose();
    ios.close();

    // Validates content of the file.
    ImageReader reader = ImageIO.getImageReader(writer);
    ImageInputStream iis = ImageIO.createImageInputStream(file);
    reader.setInput(iis);
    for (int i = 0; i < 2; i++) {
        System.out.println("Testing image " + i);
        BufferedImage imageRead = reader.read(i);
        BufferedImage imageWrite = images[2 * i].getAsBufferedImage();
        for (int x = 0; x < WIDTH; ++x) {
            for (int y = 0; y < HEIGHT; ++y) {
                if (imageRead.getRGB(x, y) != imageWrite.getRGB(x, y)) {
                    throw new RuntimeException("Test failed for image " + i);
                }
            }
        }
    }
}