Example usage for com.itextpdf.text.pdf PdfReader getPdfObject

List of usage examples for com.itextpdf.text.pdf PdfReader getPdfObject

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Introduction

In this page you can find the example usage for com.itextpdf.text.pdf PdfReader getPdfObject.

Prototype

public PdfObject getPdfObject(final int idx)

Source Link

Usage

From source file:org.gmdev.pdftrick.utils.CustomExtraImgReader.java

License:Open Source License

/**
 * Read a png image with if all other method fails
 * @param ref/*  ww  w . j  ava2s.  c  o  m*/
 * @param resultFile
 * @return The BufferedImage obj
 * @throws IOException
 * @throws ImageReadException
 */
public static BufferedImage readIndexedPNG(int ref, String resultFile) throws IOException, ImageReadException {

    PdfReader reader = new PdfReader(resultFile);
    PRStream stream = (PRStream) reader.getPdfObject(ref);
    PdfDictionary dic = stream;
    byte[] content = PdfReader.getStreamBytesRaw(stream);

    int width = dic.getAsNumber(PdfName.WIDTH).intValue();
    int height = dic.getAsNumber(PdfName.HEIGHT).intValue();
    int pngBitDepth = dic.getAsNumber(PdfName.BITSPERCOMPONENT).intValue();

    PdfObject colorspace = dic.getDirectObject(PdfName.COLORSPACE);
    PdfArray decode = dic.getAsArray(PdfName.DECODE);
    PdfArray carray = (PdfArray) colorspace;
    PdfObject id2 = carray.getDirectObject(3);

    byte[] palette = null;
    if (id2 instanceof PdfString) {
        palette = ((PdfString) id2).getBytes();
    } else if (id2 instanceof PRStream) {
        palette = PdfReader.getStreamBytes(((PRStream) id2));
    }

    Map<PdfName, FilterHandlers.FilterHandler> handlers = new HashMap<PdfName, FilterHandlers.FilterHandler>(
            FilterHandlers.getDefaultFilterHandlers());
    byte[] imageBytes = PdfReader.decodeBytes(content, dic, handlers);

    int stride = (width * pngBitDepth + 7) / 8;
    ByteArrayOutputStream ms = new ByteArrayOutputStream();
    PngWriter png = new PngWriter(ms);

    if (decode != null) {
        if (pngBitDepth == 1) {
            // if the decode array is 1,0, then we need to invert the image
            if (decode.getAsNumber(0).intValue() == 1 && decode.getAsNumber(1).intValue() == 0) {
                int len = imageBytes.length;
                for (int t = 0; t < len; ++t) {
                    imageBytes[t] ^= 0xff;
                }
            } else {
                // if the decode array is 0,1, do nothing.  It's possible that the array could be 0,0 or 1,1 - but that would be silly, so we'll just ignore that case
            }
        } else {
            // todo: add decode transformation for other depths
        }
    }
    int pngColorType = 0;
    png.writeHeader(width, height, pngBitDepth, pngColorType);

    if (palette != null) {
        png.writePalette(palette);
    }
    png.writeData(imageBytes, stride);
    png.writeEnd();

    imageBytes = ms.toByteArray();

    InputStream in = new ByteArrayInputStream(imageBytes);
    ImageInputStream ima_stream = ImageIO.createImageInputStream(in);

    BufferedImage buffImg = null;
    BufferedImage buffPic = ImageIO.read(ima_stream);

    // check if image contains a mask image ... experimental for this type of image
    BufferedImage buffMask = null;
    PRStream maskStream = (PRStream) dic.getAsStream(PdfName.SMASK);
    if (maskStream != null) {
        PdfImageObject maskImage = new PdfImageObject(maskStream);
        buffMask = maskImage.getBufferedImage();

        Image img = PdfTrickUtils.TransformGrayToTransparency(buffMask);
        buffImg = PdfTrickUtils.ApplyTransparency(buffPic, img);
    } else {
        buffImg = buffPic;
    }

    reader.close();
    ms.close();
    in.close();
    return buffImg;
}

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

/**
 *  pdf ? pdf/*from w ww  .  j  a v  a2 s.  c  om*/
 *
 * @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();
}

From source file:org.sejda.impl.itext5.component.PdfUnpacker.java

License:Open Source License

private void unpack(Set<PdfDictionary> dictionaries) throws TaskIOException {
    for (PdfDictionary dictionary : dictionaries) {
        PdfName type = dictionary.getAsName(PdfName.TYPE);
        if (PdfName.F.equals(type) || PdfName.FILESPEC.equals(type)) {
            PdfDictionary ef = dictionary.getAsDict(PdfName.EF);
            PdfString fn = dictionary.getAsString(PdfName.F);
            if (fn != null && ef != null) {
                PRStream prs = (PRStream) PdfReader.getPdfObject(ef.get(PdfName.F));
                if (prs != null) {
                    File tmpFile = copyToTemporaryFile(prs);
                    outputWriter.addOutput(file(tmpFile).name(fn.toUnicodeString()));
                }//  w w  w. j  a v  a2s. c  o m
            }
        }
    }
}

From source file:org.sejda.impl.itext5.component.PdfUnpacker.java

License:Open Source License

private Set<PdfDictionary> getEmbeddedFilesDictionaries(PdfReader reader) {
    Set<PdfDictionary> retSet = new NullSafeSet<PdfDictionary>();
    PdfDictionary catalog = reader.getCatalog();
    PdfDictionary names = catalog.getAsDict(PdfName.NAMES);
    if (names != null) {
        PdfDictionary embFiles = names.getAsDict(PdfName.EMBEDDEDFILES);
        if (embFiles != null) {
            HashMap<String, PdfObject> embMap = PdfNameTree.readTree(embFiles);
            for (PdfObject value : embMap.values()) {
                retSet.add((PdfDictionary) PdfReader.getPdfObject(value));
            }//from ww  w . j  av a 2 s  .  co  m
        }
    }
    return retSet;
}

From source file:org.sejda.impl.itext5.component.PdfUnpacker.java

License:Open Source License

private Set<PdfDictionary> getFileAttachmentsDictionaries(PdfReader reader) {
    Set<PdfDictionary> retSet = new NullSafeSet<PdfDictionary>();
    for (int k = 1; k <= reader.getNumberOfPages(); ++k) {
        PdfArray annots = reader.getPageN(k).getAsArray(PdfName.ANNOTS);
        if (annots != null) {
            for (PdfObject current : annots) {
                PdfDictionary annot = (PdfDictionary) PdfReader.getPdfObject(current);
                if (PdfName.FILEATTACHMENT.equals(annot.getAsName(PdfName.SUBTYPE))) {
                    retSet.add(annot.getAsDict(PdfName.FS));
                }/*from  w w w .j  av a 2  s. com*/
            }
        }
    }
    return retSet;
}

From source file:pdfextract.ExtractInfo.java

public void extractImagesInfo() {
    try {//from  ww  w  .  j ava 2  s .c  om
        PdfReader chartReader = new PdfReader("vv.pdf");
        for (int i = 0; i < chartReader.getXrefSize(); i++) {
            PdfObject pdfobj = chartReader.getPdfObject(i);
            if (pdfobj != null && pdfobj.isStream()) {
                PdfStream stream = (PdfStream) pdfobj;
                PdfObject pdfsubtype = stream.get(PdfName.SUBTYPE);
                //System.out.println("Stream subType: " + pdfsubtype); 
                if (pdfsubtype != null && pdfsubtype.toString().equals(PdfName.IMAGE.toString())) {
                    byte[] image = PdfReader.getStreamBytesRaw((PRStream) stream);
                    Image imageObject = Image.getInstance(image);
                    System.out.println("Resolution" + imageObject.getDpiX());
                    System.out.println("Height" + imageObject.getHeight());
                    System.out.println("Width" + imageObject.getWidth());

                }
            }
        }
    } catch (Exception e) {
        e.printStackTrace();
    }

}

From source file:pdfextract.ExtractInfo.java

public void imageNew() throws IOException {
    PdfReader reader;

    File file = new File("vv.pdf");
    reader = new PdfReader(file.getAbsolutePath());
    for (int i = 0; i < reader.getXrefSize(); i++) {
        PdfObject pdfobj = reader.getPdfObject(i);
        if (pdfobj == null || !pdfobj.isStream()) {
            continue;
        }//from   ww w. j  a v  a 2  s. co m
        PdfStream stream = (PdfStream) pdfobj;
        PdfObject pdfsubtype = stream.get(PdfName.SUBTYPE);
        if (pdfsubtype != null && pdfsubtype.toString().equals(PdfName.IMAGE.toString())) {
            byte[] img = PdfReader.getStreamBytesRaw((PRStream) stream);
            FileOutputStream out = new FileOutputStream(
                    new File(file.getParentFile(), String.format("%1$05d", i) + ".jpg"));
            out.write(img);
            out.flush();
            out.close();
        }
    }
}