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An Open Source JavaFX PDF Viewer
/*
* ===========================================
* 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;
}
}