Example usage for javax.imageio.metadata IIOMetadata isReadOnly

Introduction

In this page you can find the example usage for javax.imageio.metadata IIOMetadata isReadOnly.

Prototype

public abstract boolean isReadOnly();

Source Link

Document

Returns true if this object does not support the mergeTree , setFromTree , and reset methods.

Usage

From source file:com.ackpdfbox.app.imageio.ImageIOUtil.java

/**
 * Writes a buffered image to a file using the given image format.
 * Compression is fixed for PNG, GIF, BMP and WBMP, dependent of the quality
 * parameter for JPG, and dependent of bit count for TIFF (a bitonal image
 * will be compressed with CCITT G4, a color image with LZW). Creating a
 * TIFF image is only supported if the jai_imageio library is in the class
 * path./*from  w  w  w. ja  v a 2s  . c o m*/
 *
 * @param image the image to be written
 * @param formatName the target format (ex. "png")
 * @param output the output stream to be used for writing
 * @param dpi the resolution in dpi (dots per inch) to be used in metadata
 * @param quality quality to be used when compressing the image (0 <
 * quality < 1.0f)
 * @return true if the image file was produced, false if there was an error.
 * @throws IOException if an I/O error occurs
 */
public static boolean writeImage(BufferedImage image, String formatName, OutputStream output, int dpi,
        float quality) throws IOException {
    ImageOutputStream imageOutput = null;
    ImageWriter writer = null;
    try {
        // find suitable image writer
        Iterator<ImageWriter> writers = ImageIO.getImageWritersByFormatName(formatName);
        ImageWriteParam param = null;
        IIOMetadata metadata = null;
        // Loop until we get the best driver, i.e. one that supports
        // setting dpi in the standard metadata format; however we'd also 
        // accept a driver that can't, if a better one can't be found
        while (writers.hasNext()) {
            if (writer != null) {
                writer.dispose();
            }
            writer = writers.next();
            param = writer.getDefaultWriteParam();
            metadata = writer.getDefaultImageMetadata(new ImageTypeSpecifier(image), param);
            if (metadata != null && !metadata.isReadOnly() && metadata.isStandardMetadataFormatSupported()) {
                break;
            }
        }
        if (writer == null) {
            LOG.error("No ImageWriter found for '" + formatName + "' format");
            StringBuilder sb = new StringBuilder();
            String[] writerFormatNames = ImageIO.getWriterFormatNames();
            for (String fmt : writerFormatNames) {
                sb.append(fmt);
                sb.append(' ');
            }
            LOG.error("Supported formats: " + sb);
            return false;
        }

        // compression
        if (param != null && param.canWriteCompressed()) {
            param.setCompressionMode(ImageWriteParam.MODE_EXPLICIT);
            if (formatName.toLowerCase().startsWith("tif")) {
                // TIFF compression
                TIFFUtil.setCompressionType(param, image);
            } else {
                param.setCompressionType(param.getCompressionTypes()[0]);
                param.setCompressionQuality(quality);
            }
        }

        if (formatName.toLowerCase().startsWith("tif")) {
            // TIFF metadata
            TIFFUtil.updateMetadata(metadata, image, dpi);
        } else if ("jpeg".equals(formatName.toLowerCase()) || "jpg".equals(formatName.toLowerCase())) {
            // This segment must be run before other meta operations,
            // or else "IIOInvalidTreeException: Invalid node: app0JFIF"
            // The other (general) "meta" methods may not be used, because
            // this will break the reading of the meta data in tests
            JPEGUtil.updateMetadata(metadata, dpi);
        } else {
            // write metadata is possible
            if (metadata != null && !metadata.isReadOnly() && metadata.isStandardMetadataFormatSupported()) {
                setDPI(metadata, dpi, formatName);
            }
        }

        // write
        imageOutput = ImageIO.createImageOutputStream(output);
        writer.setOutput(imageOutput);
        writer.write(null, new IIOImage(image, null, metadata), param);
    } finally {
        if (writer != null) {
            writer.dispose();
        }
        if (imageOutput != null) {
            imageOutput.close();
        }
    }
    return true;
}

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From source file:org.forgerock.doc.maven.PNGUtils.java

private static void saveBufferedImage(final BufferedImage bufferedImage, final File outputFile,
        final int dotsPerInch) throws IOException {
    for (Iterator<ImageWriter> iw = ImageIO.getImageWritersByFormatName("png"); iw.hasNext();) {
        ImageWriter writer = iw.next();
        ImageWriteParam writeParam = writer.getDefaultWriteParam();
        ImageTypeSpecifier typeSpecifier = ImageTypeSpecifier
                .createFromBufferedImageType(BufferedImage.TYPE_INT_RGB);
        IIOMetadata metadata = writer.getDefaultImageMetadata(typeSpecifier, writeParam);
        if (metadata.isReadOnly() || !metadata.isStandardMetadataFormatSupported()) {
            continue;
        }// www.  jav a 2 s.  c om

        setDPI(metadata, dotsPerInch);

        final ImageOutputStream stream = ImageIO.createImageOutputStream(outputFile);
        try {
            writer.setOutput(stream);
            writer.write(metadata, new IIOImage(bufferedImage, null, metadata), writeParam);
        } finally {
            stream.close();
        }
        break;
    }
}

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