javax.imageio.ImageWriter Java Examples

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 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 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();
}
 

/**
 * 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>.
 */
@Override
public void encode(BufferedImage bufferedImage, OutputStream outputStream)
        throws IOException {
    ParamChecks.nullNotPermitted(bufferedImage, "bufferedImage");
    ParamChecks.nullNotPermitted(outputStream, "outputStream");
    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 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 void convertImages( final File file ) throws Exception {
	if ( file.isDirectory() ) {
		for ( final File childFile : file.listFiles() )
			convertImages( childFile );
	}
	else {
		final BufferedImage bi = ImageIO.read( file );
		
		// Default quality is not sufficient!
		// ImageIO.write( bi, "JPG", new File( file.getPath().replace( ".png", ".jpg" ) ) );
		
		final ImageWriter     iw  = ImageIO.getImageWritersByFormatName( "jpg" ).next();
		final ImageWriteParam iwp = iw.getDefaultWriteParam();
		
		iwp.setCompressionMode( ImageWriteParam.MODE_EXPLICIT );
		iwp.setCompressionQuality( 0.9f );
		
		iw.setOutput( new FileImageOutputStream( new File( file.getPath().replace( ".png", ".jpg" ) ) ) );
		iw.write( null, new IIOImage( bi , null, null ), iwp );
		iw.dispose();
	}
}
 

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 void compressJPG(String inputFilePath, String outputFilePath, String fileType) {
    InputOutput io = IOProvider.getDefault().getIO(Bundle.CTL_Base64Encode(), false);
    try {
        File imageFile = new File(inputFilePath);
        File compressedImageFile = new File(outputFilePath);

        InputStream is = new FileInputStream(imageFile);
        OutputStream os = new FileOutputStream(compressedImageFile);
        float quality = 0.5f;
        
        // create a BufferedImage as the result of decoding the supplied InputStream
        BufferedImage image = ImageIO.read(is);
        
        // get all image writers for JPG format
        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName(fileType);

        if (!writers.hasNext()) {
            throw new IllegalStateException("No writers found");
        }
        
        ImageWriter writer = writers.next();
        ImageOutputStream ios = ImageIO.createImageOutputStream(os);
        writer.setOutput(ios);
        ImageWriteParam param = writer.getDefaultWriteParam();

        param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
        param.setCompressionQuality(quality);
        
        // appends a complete image stream containing a single image and
        //associated stream and image metadata and thumbnails to the output
        writer.write(null, new IIOImage(image, null, null), param);

        is.close();
        os.close();
        ios.close();
        writer.dispose();
    } catch (IOException ex) {
        io.getOut().println("Exception: " + ex.toString());
    }
}
 

public void imageComplete(ImageWriter source) {
    print("imageComplete");

    if (state != IMAGE_STARTED) {
        error("imageComplete called without imageStarted!");
    }
    if (prevPercentageDone == 0.0F) {
        error("percentageDone was never updated!");
    }
    state = IMAGE_COMPLETE;
}
 

public static IIOMetadata getWriterMetaData(String targetFormat,
        ImageAttributes attributes, BufferedImage image, ImageWriter writer,
        ImageWriteParam param) {
    try {
        IIOMetadata metaData;
        switch (targetFormat) {
            case "png":
                metaData = ImagePngFile.getWriterMeta(attributes, image, writer, param);
                break;
            case "jpg":
            case "jpeg":
                metaData = ImageJpgFile.getWriterMeta(attributes, image, writer, param);
                break;
            case "tif":
            case "tiff":
                metaData = ImageTiffFile.getWriterMeta(attributes, image, writer, param);
                break;
            case "bmp":
                metaData = ImageBmpFile.getWriterMeta(attributes, image, writer, param);
                break;
            default:
                metaData = getWriterMetaData(attributes, image, writer, param);
        }
        return metaData;
    } catch (Exception e) {
        logger.error(e.toString());
        return null;
    }
}
 

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));
        imageOutputStream.close();
        System.out.println("Writing done.");
    } catch (Throwable e) {
        throw new RuntimeException("Writing test failed.", e);
    }
}
 

public Base64Data print(Image v) {
    ByteArrayOutputStreamEx imageData = new ByteArrayOutputStreamEx();
    XMLSerializer xs = XMLSerializer.getInstance();

    String mimeType = xs.getXMIMEContentType();
    if(mimeType==null || mimeType.startsWith("image/*"))
        // because PNG is lossless, it's a good default
        //
        // mime type can be a range, in which case we can't just pass that
        // to ImageIO.getImageWritersByMIMEType, so here I'm just assuming
        // the default of PNG. Not sure if this is complete.
        mimeType = "image/png";

    try {
        Iterator<ImageWriter> itr = ImageIO.getImageWritersByMIMEType(mimeType);
        if(itr.hasNext()) {
            ImageWriter w = itr.next();
            ImageOutputStream os = ImageIO.createImageOutputStream(imageData);
            w.setOutput(os);
            w.write(convertToBufferedImage(v));
            os.close();
            w.dispose();
        } else {
            // no encoder
            xs.handleEvent(new ValidationEventImpl(
                ValidationEvent.ERROR,
                Messages.NO_IMAGE_WRITER.format(mimeType),
                xs.getCurrentLocation(null) ));
            // TODO: proper error reporting
            throw new RuntimeException("no encoder for MIME type "+mimeType);
        }
    } catch (IOException e) {
        xs.handleError(e);
        // TODO: proper error reporting
        throw new RuntimeException(e);
    }
    Base64Data bd = new Base64Data();
    imageData.set(bd,mimeType);
    return bd;
}
 

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 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 main(String args[]) {
    ImageWriter writer = new JPEGImageWriter(null);
    try {
        writer.reset();
    } catch (OutOfMemoryError e) {
        throw new RuntimeException("Got OutOfMemoryError!");
    }
}
 

public static List<File> createTiffFiles(List<IIOImage> imageList, int index, int dpiX, int dpiY) throws IOException {
    List<File> tiffFiles = new ArrayList<File>();

    //Set up the writeParam
    TIFFImageWriteParam tiffWriteParam = new TIFFImageWriteParam(Locale.US);
    tiffWriteParam.setCompressionMode(ImageWriteParam.MODE_DISABLED);

    //Get tiff writer and set output to file
    Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName(TIFF_FORMAT);
    if (!writers.hasNext()) {
        throw new RuntimeException(JAI_IMAGE_WRITER_MESSAGE);
    }
    ImageWriter writer = writers.next();

    //Get the stream metadata
    IIOMetadata streamMetadata = writer.getDefaultStreamMetadata(tiffWriteParam);

    // all if index == -1; otherwise, only index-th
    for (IIOImage oimage : (index == -1 ? imageList : imageList.subList(index, index + 1))) {
        if (dpiX != 0 && dpiY != 0) {
            // Get the default image metadata.
            ImageTypeSpecifier imageType = ImageTypeSpecifier.createFromRenderedImage(oimage.getRenderedImage());
            ImageWriteParam param = writer.getDefaultWriteParam();
            IIOMetadata imageMetadata = writer.getDefaultImageMetadata(imageType, param);
            imageMetadata = setDPIViaAPI(imageMetadata, dpiX, dpiY);
            oimage.setMetadata(imageMetadata);
        }

        File tiffFile = File.createTempFile(OUTPUT_FILE_NAME, TIFF_EXT);
        try (ImageOutputStream ios = ImageIO.createImageOutputStream(tiffFile)) {
            writer.setOutput(ios);
            writer.write(streamMetadata, oimage, tiffWriteParam);
            tiffFiles.add(tiffFile);
        }
    }
    writer.dispose();

    return tiffFiles;
}
 

@Override
public void imageProgress(ImageWriter source, float percentageDone) {
    int progress = (int) percentageDone;
    if (progress > workDone) {
        tracker.unitsDone(progress - workDone);
        workDone = progress;
    }
}
 

public Base64Data print(Image v) {
    ByteArrayOutputStreamEx imageData = new ByteArrayOutputStreamEx();
    XMLSerializer xs = XMLSerializer.getInstance();

    String mimeType = xs.getXMIMEContentType();
    if(mimeType==null || mimeType.startsWith("image/*"))
        // because PNG is lossless, it's a good default
        //
        // mime type can be a range, in which case we can't just pass that
        // to ImageIO.getImageWritersByMIMEType, so here I'm just assuming
        // the default of PNG. Not sure if this is complete.
        mimeType = "image/png";

    try {
        Iterator<ImageWriter> itr = ImageIO.getImageWritersByMIMEType(mimeType);
        if(itr.hasNext()) {
            ImageWriter w = itr.next();
            ImageOutputStream os = ImageIO.createImageOutputStream(imageData);
            w.setOutput(os);
            w.write(convertToBufferedImage(v));
            os.close();
            w.dispose();
        } else {
            // no encoder
            xs.handleEvent(new ValidationEventImpl(
                ValidationEvent.ERROR,
                Messages.NO_IMAGE_WRITER.format(mimeType),
                xs.getCurrentLocation(null) ));
            // TODO: proper error reporting
            throw new RuntimeException("no encoder for MIME type "+mimeType);
        }
    } catch (IOException e) {
        xs.handleError(e);
        // TODO: proper error reporting
        throw new RuntimeException(e);
    }
    Base64Data bd = new Base64Data();
    imageData.set(bd,mimeType);
    return bd;
}
 

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();
}
 

@Override
protected void writeFrame(OutputStream out, BufferedImage image,
		Map<String, Object> settings) throws IOException {
	if (image.getType() == BufferedImage.TYPE_INT_ARGB
			|| image.getType() == BufferedImage.TYPE_INT_ARGB_PRE) {
		if (printWarning == false) {
			printWarning = true;
			System.err
					.println("JPEGMovWriter Warning: a BufferedImage of type TYPE_INT_ARGB may produce unexpected results. The recommended type is TYPE_INT_RGB.");
		}
	}
	float quality;
	if (settings != null
			&& settings.get(PROPERTY_QUALITY) instanceof Number) {
		quality = ((Number) settings.get(PROPERTY_QUALITY)).floatValue();
	} else if (settings != null
			&& settings.get(PROPERTY_QUALITY) instanceof String) {
		quality = Float.parseFloat((String) settings.get(PROPERTY_QUALITY));
	} else {
		quality = defaultQuality;
	}

	MemoryCacheImageOutputStream iOut = new MemoryCacheImageOutputStream(
			out);
	ImageWriter iw = ImageIO.getImageWritersByMIMEType("image/jpeg").next();
	ImageWriteParam iwParam = iw.getDefaultWriteParam();
	iwParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
	iwParam.setCompressionQuality(quality);
	iw.setOutput(iOut);
	IIOImage img = new IIOImage(image, null, null);
	iw.write(null, img, iwParam);
}
 

private static void testGetWriterFormatNames() {
    String[] names = ImageIO.getWriterFormatNames();
    for (String n : names) {
        Iterator<ImageWriter> it = ImageIO.getImageWritersByFormatName(n);
        if (!it.hasNext()) {
            throw new RuntimeException("getWriterFormatNames returned " +
                                       "an unknown name: " + n);
        }
    }
}
 

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

public File saveToFile(File captureFile) throws FileNotFoundException, IOException {
    writePNG(captureFile);

    ImageReader reader = getPNGImageReader();
    ImageInputStream iis = ImageIO.createImageInputStream(new FileInputStream(captureFile));
    reader.setInput(iis);
    BufferedImage pngImage = reader.read(0);
    IIOMetadata imageMetadata = reader.getImageMetadata(0);

    Node root = imageMetadata.getAsTree(imageMetadata.getNativeMetadataFormatName());
    IIOMetadataNode textNode = new IIOMetadataNode("tEXt");
    ArrayList<Annotation> annotations = imagePanel.getAnnotations();
    for (int i = 0; i < annotations.size(); i++) {
        textNode.appendChild(getAnnotationNode((Annotation) annotations.get(i), i));
    }
    root.appendChild(textNode);

    imageMetadata.mergeTree(imageMetadata.getNativeMetadataFormatName(), root);

    IIOImage imageWrite = new IIOImage(pngImage, new ArrayList<BufferedImage>(), imageMetadata);

    ImageWriter writer = getPNGImageWriter();
    ImageOutputStream ios = ImageIO.createImageOutputStream(new FileOutputStream(captureFile));
    writer.setOutput(ios);
    writer.write(imageWrite);
    writer.dispose();

    JFrame frame = new JFrame();
    frame.setLayout(new BorderLayout());
    ImagePanel finalImage = new ImagePanel(new FileInputStream(captureFile), false);
    frame.add(finalImage, BorderLayout.CENTER);
    frame.pack();
    File savedFile = new File(captureFile.getParentFile(), "ext-" + captureFile.getName());
    getScreenShot(frame.getContentPane(), savedFile);
    frame.dispose();

    return savedFile;
}
 

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 ImageAndResolution getImageAndResolution(BufferedImage buffImage, int dpi, ImageWriter writer, ImageWriteParam imageWriterParams,
		IIOMetadata metadata) throws IOException {
	try (ByteArrayOutputStream os = new ByteArrayOutputStream(); ImageOutputStream imageOs = ImageIO.createImageOutputStream(os)) {
		writer.setOutput(imageOs);
		writer.write(metadata, new IIOImage(buffImage, null, metadata), imageWriterParams);
		return new ImageAndResolution(new InMemoryDocument(os.toByteArray()), dpi, dpi);
	}
}
 

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));
        imageOutputStream.close();
        System.out.println("Writing done.");
    } catch (Throwable e) {
        throw new RuntimeException("Writing test failed.", e);
    }
}
 

/** 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());
    }
}
 

public void writeAborted(ImageWriter source) {
}
 

public void thumbnailComplete(ImageWriter source) {
}
 

public LinkedHashSet<String> getPlatformMappingsForFlavor(DataFlavor df) {
    LinkedHashSet<String> natives = new LinkedHashSet<>(1);

    if (df == null) {
        return natives;
    }

    String charset = df.getParameter("charset");
    String baseType = df.getPrimaryType() + "/" + df.getSubType();
    String mimeType = baseType;

    if (charset != null && DataTransferer.isFlavorCharsetTextType(df)) {
        mimeType += ";charset=" + charset;
    }

    // Add a mapping to the MIME native whenever the representation class
    // doesn't require translation.
    if (df.getRepresentationClass() != null &&
        (df.isRepresentationClassInputStream() ||
         df.isRepresentationClassByteBuffer() ||
         byte[].class.equals(df.getRepresentationClass()))) {
        natives.add(mimeType);
    }

    if (DataFlavor.imageFlavor.equals(df)) {
        String[] mimeTypes = ImageIO.getWriterMIMETypes();
        if (mimeTypes != null) {
            for (int i = 0; i < mimeTypes.length; i++) {
                Iterator writers =
                    ImageIO.getImageWritersByMIMEType(mimeTypes[i]);

                while (writers.hasNext()) {
                    ImageWriter imageWriter = (ImageWriter)writers.next();
                    ImageWriterSpi writerSpi =
                        imageWriter.getOriginatingProvider();

                    if (writerSpi != null &&
                        writerSpi.canEncodeImage(getDefaultImageTypeSpecifier())) {
                        natives.add(mimeTypes[i]);
                        break;
                    }
                }
            }
        }
    } else if (DataTransferer.isFlavorCharsetTextType(df)) {
        // stringFlavor is semantically equivalent to the standard
        // "text/plain" MIME type.
        if (DataFlavor.stringFlavor.equals(df)) {
            baseType = "text/plain";
        }

        for (String encoding : DataTransferer.standardEncodings()) {
            if (!encoding.equals(charset)) {
                natives.add(baseType + ";charset=" + encoding);
            }
        }

        // Add a MIME format without specified charset.
        if (!natives.contains(baseType)) {
            natives.add(baseType);
        }
    }

    return natives;
}