Example usage for com.itextpdf.text.pdf PdfName GROUP

Introduction

In this page you can find the example usage for com.itextpdf.text.pdf PdfName GROUP.

Prototype

PdfName GROUP

To view the source code for com.itextpdf.text.pdf PdfName GROUP.

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Document

A name of an attribute.

Usage

From source file:cz.muni.pdfjbim.PdfImageExtractor.java

License:Apache License

private List<Image> getImagesFromPdfDict(PdfDictionary dict, PdfReader doc) throws IOException {
    List<Image> images = new ArrayList<Image>();
    PdfDictionary res = (PdfDictionary) (PdfReader.getPdfObject(dict.get(PdfName.RESOURCES)));
    PdfDictionary xobj = (PdfDictionary) (PdfReader.getPdfObject(res.get(PdfName.XOBJECT)));

    if (xobj != null) {
        for (PdfName name : xobj.getKeys()) {
            PdfObject obj = xobj.get(name);
            if (obj.isIndirect()) {
                PdfDictionary tg = (PdfDictionary) (PdfReader.getPdfObject(obj));
                PdfName subtype = (PdfName) (PdfReader.getPdfObject(tg.get(PdfName.SUBTYPE)));
                if (PdfName.IMAGE.equals(subtype)) {
                    int xrefIdx = ((PRIndirectReference) obj).getNumber();
                    PdfObject pdfObj = doc.getPdfObject(xrefIdx);
                    PdfStream str = (PdfStream) (pdfObj);
                    byte[] bytes = PdfReader.getStreamBytesRaw((PRStream) str);

                    String filter = tg.get(PdfName.FILTER).toString();
                    String width = tg.get(PdfName.WIDTH).toString();
                    String height = tg.get(PdfName.HEIGHT).toString();
                    String bpp = tg.get(PdfName.BITSPERCOMPONENT).toString();

                    if ("/FlateDecode".equals(filter)) {
                        bytes = PdfReader.FlateDecode(bytes, true);
                        try {
                            images.add(Image.getInstance(bytes));
                        } catch (BadElementException ex) {
                            log.warn("problem to process FlatDecoded Image", ex);
                        }//from ww  w.ja  v  a  2  s.  c  om
                    } else if (PdfName.FORM.equals(subtype) || PdfName.GROUP.equals(subtype)) {
                        images.addAll(getImagesFromPdfDict(tg, doc));
                    }
                }
            }
        }
    }
    return images;
}

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