org.jpedal.jbig2.segment.region.text.TextRegionSegment Maven / Gradle / Ivy
Go to download
Show more of this group Show more artifacts with this name
Show all versions of OpenViewerFX Show documentation
Show all versions of OpenViewerFX Show documentation
An Open Source JavaFX PDF Viewer
/**
* ===========================================
* Java Pdf Extraction Decoding Access Library
* ===========================================
*
* Project Info: http://www.jpedal.org
* (C) Copyright 1997-2008, IDRsolutions and Contributors.
* Main Developer: Simon Barnett
*
* This file is part of JPedal
*
* Copyright (c) 2008, IDRsolutions
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of the IDRsolutions nor the
* names of its contributors may be used to endorse or promote products
* derived from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY IDRsolutions ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
* DISCLAIMED. IN NO EVENT SHALL IDRsolutions BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* Other JBIG2 image decoding implementations include
* jbig2dec (http://jbig2dec.sourceforge.net/)
* xpdf (http://www.foolabs.com/xpdf/)
*
* The final draft JBIG2 specification can be found at http://www.jpeg.org/public/fcd14492.pdf
*
* All three of the above resources were used in the writing of this software, with methodologies,
* processes and inspiration taken from all three.
*
* ---------------
* TextRegionSegment.java
* ---------------
*/
package org.jpedal.jbig2.segment.region.text;
import java.io.IOException;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import org.jpedal.jbig2.JBIG2Exception;
import org.jpedal.jbig2.decoders.HuffmanDecoder;
import org.jpedal.jbig2.decoders.JBIG2StreamDecoder;
import org.jpedal.jbig2.image.JBIG2Bitmap;
import org.jpedal.jbig2.segment.Segment;
import org.jpedal.jbig2.segment.pageinformation.PageInformationSegment;
import org.jpedal.jbig2.segment.region.RegionFlags;
import org.jpedal.jbig2.segment.region.RegionSegment;
import org.jpedal.jbig2.segment.symboldictionary.SymbolDictionarySegment;
import org.jpedal.jbig2.util.BinaryOperation;
public class TextRegionSegment extends RegionSegment {
private TextRegionFlags textRegionFlags = new TextRegionFlags();
private TextRegionHuffmanFlags textRegionHuffmanFlags = new TextRegionHuffmanFlags();
private int noOfSymbolInstances;
private boolean inlineImage;
private short[] symbolRegionAdaptiveTemplateX = new short[2], symbolRegionAdaptiveTemplateY = new short[2];
public TextRegionSegment(JBIG2StreamDecoder streamDecoder, boolean inlineImage) {
super(streamDecoder);
this.inlineImage = inlineImage;
}
public void readSegment() throws IOException, JBIG2Exception {
if (JBIG2StreamDecoder.debug)
System.out.println("==== Reading Text Region ====");
super.readSegment();
/** read text region Segment flags */
readTextRegionFlags();
short[] buff = new short[4];
decoder.readByte(buff);
noOfSymbolInstances = BinaryOperation.getInt32(buff);
if (JBIG2StreamDecoder.debug)
System.out.println("noOfSymbolInstances = " + noOfSymbolInstances);
int noOfReferredToSegments = segmentHeader.getReferredToSegmentCount();
int[] referredToSegments = segmentHeader.getReferredToSegments();
List codeTables = new ArrayList();
List segmentsReferenced = new ArrayList();
int noOfSymbols = 0;
if (JBIG2StreamDecoder.debug)
System.out.println("noOfReferredToSegments = " + noOfReferredToSegments);
for (int i = 0; i < noOfReferredToSegments; i++) {
Segment seg = decoder.findSegment(referredToSegments[i]);
int type = seg.getSegmentHeader().getSegmentType();
if (type == Segment.SYMBOL_DICTIONARY) {
segmentsReferenced.add(seg);
noOfSymbols += ((SymbolDictionarySegment) seg).getNoOfExportedSymbols();
} else if (type == Segment.TABLES) {
codeTables.add(seg);
}
}
int symbolCodeLength = 0;
int count = 1;
while (count < noOfSymbols) {
symbolCodeLength++;
count <<= 1;
}
int currentSymbol = 0;
JBIG2Bitmap[] symbols = new JBIG2Bitmap[noOfSymbols];
for (Iterator it = segmentsReferenced.iterator(); it.hasNext();) {
Segment seg = (Segment) it.next();
if (seg.getSegmentHeader().getSegmentType() == Segment.SYMBOL_DICTIONARY) {
JBIG2Bitmap[] bitmaps = ((SymbolDictionarySegment) seg).getBitmaps();
for (int j = 0; j < bitmaps.length; j++) {
symbols[currentSymbol] = bitmaps[j];
currentSymbol++;
}
}
}
int[][] huffmanFSTable = null;
int[][] huffmanDSTable = null;
int[][] huffmanDTTable = null;
int[][] huffmanRDWTable = null;
int[][] huffmanRDHTable = null;
int[][] huffmanRDXTable = null;
int[][] huffmanRDYTable = null;
int[][] huffmanRSizeTable = null;
boolean sbHuffman = textRegionFlags.getFlagValue(TextRegionFlags.SB_HUFF) != 0;
int i = 0;
if (sbHuffman) {
int sbHuffFS = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_FS);
if (sbHuffFS == 0) {
huffmanFSTable = HuffmanDecoder.huffmanTableF;
} else if (sbHuffFS == 1) {
huffmanFSTable = HuffmanDecoder.huffmanTableG;
} else {
}
int sbHuffDS = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_DS);
if (sbHuffDS == 0) {
huffmanDSTable = HuffmanDecoder.huffmanTableH;
} else if (sbHuffDS == 1) {
huffmanDSTable = HuffmanDecoder.huffmanTableI;
} else if (sbHuffDS == 2) {
huffmanDSTable = HuffmanDecoder.huffmanTableJ;
} else {
}
int sbHuffDT = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_DT);
if (sbHuffDT == 0) {
huffmanDTTable = HuffmanDecoder.huffmanTableK;
} else if (sbHuffDT == 1) {
huffmanDTTable = HuffmanDecoder.huffmanTableL;
} else if (sbHuffDT == 2) {
huffmanDTTable = HuffmanDecoder.huffmanTableM;
} else {
}
int sbHuffRDW = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDW);
if (sbHuffRDW == 0) {
huffmanRDWTable = HuffmanDecoder.huffmanTableN;
} else if (sbHuffRDW == 1) {
huffmanRDWTable = HuffmanDecoder.huffmanTableO;
} else {
}
int sbHuffRDH = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDH);
if (sbHuffRDH == 0) {
huffmanRDHTable = HuffmanDecoder.huffmanTableN;
} else if (sbHuffRDH == 1) {
huffmanRDHTable = HuffmanDecoder.huffmanTableO;
} else {
}
int sbHuffRDX = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDX);
if (sbHuffRDX == 0) {
huffmanRDXTable = HuffmanDecoder.huffmanTableN;
} else if (sbHuffRDX == 1) {
huffmanRDXTable = HuffmanDecoder.huffmanTableO;
} else {
}
int sbHuffRDY = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_RDY);
if (sbHuffRDY == 0) {
huffmanRDYTable = HuffmanDecoder.huffmanTableN;
} else if (sbHuffRDY == 1) {
huffmanRDYTable = HuffmanDecoder.huffmanTableO;
} else {
}
int sbHuffRSize = textRegionHuffmanFlags.getFlagValue(TextRegionHuffmanFlags.SB_HUFF_RSIZE);
if (sbHuffRSize == 0) {
huffmanRSizeTable = HuffmanDecoder.huffmanTableA;
} else {
}
}
int[][] runLengthTable = new int[36][4];
int[][] symbolCodeTable = new int[noOfSymbols + 1][4];
if (sbHuffman) {
decoder.consumeRemainingBits();
for (i = 0; i < 32; i++) {
runLengthTable[i] = new int[] { i, decoder.readBits(4), 0, 0 };
}
runLengthTable[32] = new int[] { 0x103, decoder.readBits(4), 2, 0 };
runLengthTable[33] = new int[] { 0x203, decoder.readBits(4), 3, 0 };
runLengthTable[34] = new int[] { 0x20b, decoder.readBits(4), 7, 0 };
runLengthTable[35] = new int[] { 0, 0, HuffmanDecoder.jbig2HuffmanEOT };
runLengthTable = huffmanDecoder.buildTable(runLengthTable, 35);
for (i = 0; i < noOfSymbols; i++) {
symbolCodeTable[i] = new int[] { i, 0, 0, 0 };
}
i = 0;
while (i < noOfSymbols) {
int j = huffmanDecoder.decodeInt(runLengthTable).intResult();
if (j > 0x200) {
for (j -= 0x200; j != 0 && i < noOfSymbols; j--) {
symbolCodeTable[i++][1] = 0;
}
} else if (j > 0x100) {
for (j -= 0x100; j != 0 && i < noOfSymbols; j--) {
symbolCodeTable[i][1] = symbolCodeTable[i - 1][1];
i++;
}
} else {
symbolCodeTable[i++][1] = j;
}
}
symbolCodeTable[noOfSymbols][1] = 0;
symbolCodeTable[noOfSymbols][2] = HuffmanDecoder.jbig2HuffmanEOT;
symbolCodeTable = huffmanDecoder.buildTable(symbolCodeTable, noOfSymbols);
decoder.consumeRemainingBits();
} else {
symbolCodeTable = null;
arithmeticDecoder.resetIntStats(symbolCodeLength);
arithmeticDecoder.start();
}
boolean symbolRefine = textRegionFlags.getFlagValue(TextRegionFlags.SB_REFINE) != 0;
int logStrips = textRegionFlags.getFlagValue(TextRegionFlags.LOG_SB_STRIPES);
int defaultPixel = textRegionFlags.getFlagValue(TextRegionFlags.SB_DEF_PIXEL);
int combinationOperator = textRegionFlags.getFlagValue(TextRegionFlags.SB_COMB_OP);
boolean transposed = textRegionFlags.getFlagValue(TextRegionFlags.TRANSPOSED) != 0;
int referenceCorner = textRegionFlags.getFlagValue(TextRegionFlags.REF_CORNER);
int sOffset = textRegionFlags.getFlagValue(TextRegionFlags.SB_DS_OFFSET);
int template = textRegionFlags.getFlagValue(TextRegionFlags.SB_R_TEMPLATE);
if (symbolRefine) {
arithmeticDecoder.resetRefinementStats(template, null);
}
JBIG2Bitmap bitmap = new JBIG2Bitmap(regionBitmapWidth, regionBitmapHeight, arithmeticDecoder, huffmanDecoder, mmrDecoder);
bitmap.readTextRegion(sbHuffman, symbolRefine, noOfSymbolInstances, logStrips, noOfSymbols, symbolCodeTable, symbolCodeLength, symbols, defaultPixel, combinationOperator, transposed, referenceCorner, sOffset, huffmanFSTable, huffmanDSTable, huffmanDTTable, huffmanRDWTable, huffmanRDHTable, huffmanRDXTable, huffmanRDYTable, huffmanRSizeTable, template, symbolRegionAdaptiveTemplateX, symbolRegionAdaptiveTemplateY, decoder);
if (inlineImage) {
PageInformationSegment pageSegment = decoder.findPageSegement(segmentHeader.getPageAssociation());
JBIG2Bitmap pageBitmap = pageSegment.getPageBitmap();
if (JBIG2StreamDecoder.debug)
System.out.println(pageBitmap + " " + bitmap);
int externalCombinationOperator = regionFlags.getFlagValue(RegionFlags.EXTERNAL_COMBINATION_OPERATOR);
pageBitmap.combine(bitmap, regionBitmapXLocation, regionBitmapYLocation, externalCombinationOperator);
} else {
bitmap.setBitmapNumber(getSegmentHeader().getSegmentNumber());
decoder.appendBitmap(bitmap);
}
decoder.consumeRemainingBits();
}
private void readTextRegionFlags() throws IOException {
/** extract text region Segment flags */
short[] textRegionFlagsField = new short[2];
decoder.readByte(textRegionFlagsField);
int flags = BinaryOperation.getInt16(textRegionFlagsField);
textRegionFlags.setFlags(flags);
if (JBIG2StreamDecoder.debug)
System.out.println("text region Segment flags = " + flags);
boolean sbHuff = textRegionFlags.getFlagValue(TextRegionFlags.SB_HUFF) != 0;
if (sbHuff) {
/** extract text region Segment Huffman flags */
short[] textRegionHuffmanFlagsField = new short[2];
decoder.readByte(textRegionHuffmanFlagsField);
flags = BinaryOperation.getInt16(textRegionHuffmanFlagsField);
textRegionHuffmanFlags.setFlags(flags);
if (JBIG2StreamDecoder.debug)
System.out.println("text region segment Huffman flags = " + flags);
}
boolean sbRefine = textRegionFlags.getFlagValue(TextRegionFlags.SB_REFINE) != 0;
int sbrTemplate = textRegionFlags.getFlagValue(TextRegionFlags.SB_R_TEMPLATE);
if (sbRefine && sbrTemplate == 0) {
symbolRegionAdaptiveTemplateX[0] = readATValue();
symbolRegionAdaptiveTemplateY[0] = readATValue();
symbolRegionAdaptiveTemplateX[1] = readATValue();
symbolRegionAdaptiveTemplateY[1] = readATValue();
}
}
public TextRegionFlags getTextRegionFlags() {
return textRegionFlags;
}
public TextRegionHuffmanFlags getTextRegionHuffmanFlags() {
return textRegionHuffmanFlags;
}
}