lljtrantutorial.java

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     * this java reads the cropped image directly from LLJTran using directio.
     * Then the image is scaled to thumbnail size and this image is set as the
     * new Thumbnail<br>
     * 4. Saves the transormed Image to outputFile with the new Thumbnail
     */
    public static void main2(String[] args) throws Exception {
        if(args.length != 6)
        {
            System.out.println("Usage: java LLJTranTutorial <inputFile> <outputFile> <cropX> <cropY> <cropWidth> <cropHeight>");
            System.exit(1);
        }

        // 1. Initialize LLJTran and Read the entire Image including Appx markers
        LLJTran llj = new LLJTran(new File(args[0]));
        // If you pass the 2nd parameter as false, Exif information is not
        // loaded and hence will not be written.
        llj.read(LLJTran.READ_ALL, true);

        // 2. Crop it to the specified Bounds
        Rectangle cropArea = new Rectangle();
        cropArea.x = Integer.parseInt(args[2]);
        cropArea.y = Integer.parseInt(args[3]);
        cropArea.width = Integer.parseInt(args[4]);
        cropArea.height = Integer.parseInt(args[5]);
        llj.transform(LLJTran.CROP, LLJTran.OPT_DEFAULTS, cropArea);

        // 3. If Image has an Exif header set/change the Thumbnail to the
        // downscale of new Image
        if(llj.getImageInfo() instanceof Exif)
        {
            // Read the image in llj and get a Thumbnail Image from it.
            //
            // In the regular usage you can save the image in llj to an
            // OutputStream.
            //
            // However since llj implements an IterativeWriter the image can be
            // directly read
            InStreamFromIterativeWriter iwip = new InStreamFromIterativeWriter();
            IterativeWriter iWriter = llj.initWrite(iwip.getWriterOutputStream(),
                                        LLJTran.NONE, LLJTran.OPT_WRITE_ALL,
                                        null, 0, false);
            iwip.setIterativeWriter(iWriter);
            byte newThumbnail[] = getThumbnailImage(iwip);
            llj.wrapupIterativeWrite(iWriter);

            // Set the new Thumbnail
            if(llj.setThumbnail(newThumbnail, 0, newThumbnail.length,
                                ImageResources.EXT_JPG))
                System.out.println("Successfully Set New Thumbnail");
            else
                System.out.println("Error Setting New Thumbnail");
        }
        else
            System.out.println("Cannot Set Thumbnail Since There is no EXIF Header");

        // 4. Save the Image with the new Thumbnail
        OutputStream out = new BufferedOutputStream(
                                new FileOutputStream(args[1]));
        llj.save(out, LLJTran.OPT_WRITE_ALL);
        out.close();

        // Cleanup
        llj.freeMemory();
    }

    /**
     * This example demonstrates modifyig just the Exif Header using xferInfo.
     * It also shows the use of SplitInputStream for LLJTran to Share the Image
     * Input with jdk's ImageReader.<p>
     *
     * Usage: java LLJTranTutorial &lt;inputFile&gt; &lt;outputFile&gt;<p>
     *
     * inputFile must be a jpeg file without Exif or with Exif but without a
     * Thumbnail image.
     *
     * The program does the following:<p>
     *
     * 1. Reads the Image from inputFile upto READ_HEADER along with the
     *    ImageReader using SplitInputStream<br>
     * 2. If the image has a Thumbnail (Which means it has a Exif Header) it
     *    prints a message and exits.<br>
     * 3. If the Image does not have an Exif Header it creates a dummy Exif
     *    Header<br>
     * 4. The image is scaled to thumbnail size and this image is set as the
     *    new Thumbnail
     * 5. Transfers the image from inputFile to outputFile replacing the new
     *    Exif with the Thumbnail so that outputFile has a Thumbnail.
     */
    public static void main3(String[] args) throws Exception {
        if(args.length != 2)
        {
            System.out.println("Usage: java LLJTranTutorial <inputFile> <outputFile>");
            System.exit(1);
        }

        // 1. Read the Image from inputFile upto READ_HEADER along with the
        //    ImageReader using SplitInputStream and Generate a Thumbnail from
        //    the Image.
        InputStream fip = new FileInputStream(args[0]); // No need to buffer
        SplitInputStream sip = new SplitInputStream(fip);
        // Create a substream for LLJTran to use
        InputStream subIp = sip.createSubStream();
        LLJTran llj = new LLJTran(subIp);
        // Normally it would be better to read the entire image when reading
        // shared. But LLJTran only needs to read upto header for loading
        // imageInfo and using xferInfo.
        llj.initRead(LLJTran.READ_HEADER, true, true);
        sip.attachSubReader(llj, subIp);
        // LLJTran reads the image when the below API reads from sip via
        // nextRead() calls made by sip.
        byte newThumbnail[] = getThumbnailImage(sip);
        sip.wrapup();
        fip.close();

        // Check llj for errors
        String msg = llj.getErrorMsg();
        if(msg != null)
        {
            System.out.println("Error in LLJTran While Loading Image: " + msg);
            Exception e = llj.getException();
            if(e != null)
            {
                System.out.println("Got an Exception, throwing it..");
                throw e;
            }
            System.exit(1);
        }

        // 2. If the image has a Thumbnail (Which means it has a Exif Header)
        //    print a message and exit.
        AbstractImageInfo imageInfo = llj.getImageInfo();
        if(imageInfo.getThumbnailLength() > 0)
        {
            System.out.println("Image already has a Thumbnail. Exitting..");
            System.exit(1);
        }

        // 3. If the Image does not have an Exif Header create a dummy Exif
        //    Header
        if(!(imageInfo instanceof Exif))
        {
            System.out.println("Adding a Dummy Exif Header");
            llj.addAppx(LLJTran.dummyExifHeader, 0,
                        LLJTran.dummyExifHeader.length, true);
            imageInfo = llj.getImageInfo(); // This would have changed

            Exif exif = (Exif) imageInfo;

            // Changed Date/Time and dimensions in Dummy Exif
            Entry entry = exif.getTagValue(Exif.DATETIME, true);
            if(entry != null)
                entry.setValue(0, "1998:08:18 11:15:00");
            entry = exif.getTagValue(Exif.DATETIMEORIGINAL, true);
            if(entry != null)
                entry.setValue(0, "1998:08:18 11:15:00");
            entry = exif.getTagValue(Exif.DATETIMEDIGITIZED, true);
            if(entry != null)
                entry.setValue(0, "1998:08:18 11:15:00");

            int imageWidth = llj.getWidth();
            int imageHeight = llj.getHeight();
            if(imageWidth > 0 && imageHeight > 0)
            {
                entry = exif.getTagValue(Exif.EXIFIMAGEWIDTH, true);
                if(entry != null)
                    entry.setValue(0, new Integer(imageWidth));
                entry = exif.getTagValue(Exif.EXIFIMAGELENGTH, true);
                if(entry != null)
                    entry.setValue(0, new Integer(imageHeight));
            }
        }

        // 4. Set the new Thumbnail
        if(llj.setThumbnail(newThumbnail, 0, newThumbnail.length,
                             ImageResources.EXT_JPG))
            System.out.println("Successfully Set New Thumbnail");
        else
            System.out.println("Error Setting New Thumbnail");

        // 5. Transfer the image from inputFile to outputFile replacing the new
        //    Exif with the Thumbnail so that outputFile has a Thumbnail.
        fip = new BufferedInputStream(new FileInputStream(args[0]));
        OutputStream out = new BufferedOutputStream(
                                new FileOutputStream(args[1]));
        // Replace the new Exif Header in llj while copying the image from fip
        // to out
        llj.xferInfo(fip, out, LLJTran.REPLACE, LLJTran.RETAIN);
        fip.close();
        out.close();

        // Cleanup
        llj.freeMemory();
    }
}