org.jpedal.parser.image.IgnoreMask Maven / Gradle / Ivy

Go to download
/*
 * ===========================================
 * Java Pdf Extraction Decoding Access Library
 * ===========================================
 *
 * Project Info:  http://www.idrsolutions.com
 * Help section for developers at http://www.idrsolutions.com/support/
 *
 * (C) Copyright 1997-2015 IDRsolutions and Contributors.
 *
 * This file is part of JPedal/JPDF2HTML5
 *
     This library is free software; you can redistribute it and/or
    modify it under the terms of the GNU Lesser General Public
    License as published by the Free Software Foundation; either
    version 2.1 of the License, or (at your option) any later version.

    This library is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
    Lesser General Public License for more details.

    You should have received a copy of the GNU Lesser General Public
    License along with this library; if not, write to the Free Software
    Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA


 *
 * ---------------
 * IgnoreMask.java
 * ---------------
 */
package org.jpedal.parser.image;

import java.awt.image.BufferedImage;
import java.awt.image.DataBufferByte;
import org.jpedal.color.GenericColorSpace;
import org.jpedal.exception.PdfException;
import org.jpedal.io.ColorSpaceConvertor;
import org.jpedal.io.PdfFilteredReader;
import org.jpedal.io.PdfObjectReader;
import org.jpedal.objects.raw.PdfArrayIterator;
import org.jpedal.objects.raw.PdfDictionary;
import org.jpedal.objects.raw.PdfObject;
import org.jpedal.parser.image.data.ImageData;

/**
 *
 * @author markee
 */
class IgnoreMask {
    
    
    public static boolean isIgnored(PdfObject XObject, final ImageData imageData, GenericColorSpace decodeColorData, PdfObjectReader currentPdfFile) throws PdfException {
        
        byte[] objectData;
        boolean ignoreImage=false;
        XObject.setFloatArray(PdfDictionary.Decode, new float[]{1,0});
        final PdfArrayIterator Filters = XObject.getMixedArray(PdfDictionary.Filter);
        boolean isMaskJPX=false;
        //check not handled elsewhere
        int firstValue;
        if(Filters!=null && Filters.hasMoreTokens()){
            while(Filters.hasMoreTokens()){
                firstValue=Filters.getNextValueAsConstant(true);
                //isDCT=firstValue==PdfFilteredReader.DCTDecode;
                isMaskJPX=firstValue==PdfFilteredReader.JPXDecode;
            }
        }
        
        byte[] objData = currentPdfFile.readStream(XObject, true, true, false, false, false, null);
        imageData.setDepth(1);
        int w = XObject.getInt(PdfDictionary.Width);
        int h = XObject.getInt(PdfDictionary.Height);
        int newDepth = XObject.getInt(PdfDictionary.BitsPerComponent);
        
//JPEG2000 causes us special difficulties as we not actually decoding objectData because
        //it is JPEG2000 and we decode as part of image handling because Java does byte[] to image directly
        //
        //This code fixes specific example by getting the actual data and ignoring empty mask but will
        //probably need developing further if we find other examples
        if(isMaskJPX){ //see case 17665 for example
            BufferedImage img= decodeColorData.JPEG2000ToRGBImage(objData,w,h,null,-1,-1,8);
            img=ColorSpaceConvertor.convertColorspace(img, 10);
            
            objectData = ((DataBufferByte) img.getRaster().getDataBuffer()).getData();
            
            boolean isEmptyMask=true;
            for(final byte b: objectData){
                if(b!=0){
                    isEmptyMask=false;
                    break;
                }
            }
            if(isEmptyMask) {
                ignoreImage=true;
            }
            
            //we need to unset this as e have handled the JPX filter
            XObject.setMixedArray(PdfDictionary.Filter,null);
        }
        if(newDepth!=PdfDictionary.Unknown) {
            imageData.setDepth(newDepth);
            
        }
        imageData.setWidth(w);
        imageData.setHeight(h);
        imageData.setObjectData(objData);
        
        return ignoreImage;
    }
    
    
}