Example usage for com.itextpdf.text.pdf PRStream clear

Introduction

In this page you can find the example usage for com.itextpdf.text.pdf PRStream clear.

Prototype

public void clear() 

Source Link

Document

Removes all the PdfObjects and its keys from the PdfDictionary.

Usage

From source file:mkl.testarea.itext5.pdfcleanup.PdfCleanUpContentOperator.java

License:Open Source License

private void updateImageStream(PRStream imageStream, byte[] newData)
        throws BadElementException, IOException, BadPdfFormatException {
    PdfImage image = new PdfImage(Image.getInstance(newData), "", null);

    if (imageStream.contains(PdfName.SMASK)) {
        image.put(PdfName.SMASK, imageStream.get(PdfName.SMASK));
    }/* w  ww .  j  a  va2  s  .  com*/

    if (imageStream.contains(PdfName.MASK)) {
        image.put(PdfName.MASK, imageStream.get(PdfName.MASK));
    }

    if (imageStream.contains(PdfName.SMASKINDATA)) {
        image.put(PdfName.SMASKINDATA, imageStream.get(PdfName.SMASKINDATA));
    }

    imageStream.clear();
    imageStream.putAll(image);
    imageStream.setDataRaw(image.getBytes());
}

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From source file:org.h819.commons.file.MyPDFUtils.java

/**
 *  pdf ? pdf/*  w w w.  java 2 s.  c  o  m*/
 *
 * @param srcPdf      the original PDF
 * @param destPdf     the resulting PDF
 * @param imageFactor The multiplication factor for the image (?  imageFacto =0.5f)
 * @throws IOException
 * @throws DocumentException
 */
public static void compressPdf(File srcPdf, File destPdf, float imageFactor)
        throws IOException, DocumentException {

    PdfReader reader = new PdfReader(srcPdf.getAbsolutePath());
    int n = reader.getXrefSize();
    PdfObject object;
    PRStream stream;
    // Look for image and manipulate image stream
    for (int i = 0; i < n; i++) {
        object = reader.getPdfObject(i);
        if (object == null || !object.isStream())
            continue;
        stream = (PRStream) object;
        if (!PdfName.IMAGE.equals(stream.getAsName(PdfName.SUBTYPE)))
            continue;
        if (!PdfName.DCTDECODE.equals(stream.getAsName(PdfName.FILTER)))
            continue;
        PdfImageObject image = new PdfImageObject(stream);
        BufferedImage bi = image.getBufferedImage();
        if (bi == null)
            continue;
        int width = (int) (bi.getWidth() * imageFactor);
        int height = (int) (bi.getHeight() * imageFactor);
        if (width <= 0 || height <= 0)
            continue;
        BufferedImage img = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        AffineTransform at = AffineTransform.getScaleInstance(imageFactor, imageFactor);
        Graphics2D g = img.createGraphics();
        g.drawRenderedImage(bi, at);
        ByteArrayOutputStream imgBytes = new ByteArrayOutputStream();
        ImageIO.write(img, "JPG", imgBytes);
        stream.clear();
        stream.setData(imgBytes.toByteArray(), false, PRStream.NO_COMPRESSION);
        stream.put(PdfName.TYPE, PdfName.XOBJECT);
        stream.put(PdfName.SUBTYPE, PdfName.IMAGE);
        stream.put(PdfName.FILTER, PdfName.DCTDECODE);
        stream.put(PdfName.WIDTH, new PdfNumber(width));
        stream.put(PdfName.HEIGHT, new PdfNumber(height));
        stream.put(PdfName.BITSPERCOMPONENT, new PdfNumber(8));
        stream.put(PdfName.COLORSPACE, PdfName.DEVICERGB);
    }
    reader.removeUnusedObjects();
    // Save altered PDF
    PdfStamper stamper = new PdfStamper(reader, new FileOutputStream(destPdf.getAbsolutePath()));
    stamper.setFullCompression();
    stamper.close();
    reader.close();
}

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