cblksizespec.java

jpeg2000算法实现

/*
 * CVS identifier:
 *
 * $Id: CBlkSizeSpec.java,v 1.11 2001/02/14 10:38:18 grosbois Exp $
 *
 * Class:                   CBlkSizeSpec
 *
 * Description:             Specification of the code-blocks size
 *
 *
 *
 * COPYRIGHT:
 * 
 * This software module was originally developed by Rapha雔 Grosbois and
 * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
 * Askel鰂 (Ericsson Radio Systems AB); and Bertrand Berthelot, David
 * Bouchard, F閘ix Henry, Gerard Mozelle and Patrice Onno (Canon Research
 * Centre France S.A) in the course of development of the JPEG2000
 * standard as specified by ISO/IEC 15444 (JPEG 2000 Standard). This
 * software module is an implementation of a part of the JPEG 2000
 * Standard. Swiss Federal Institute of Technology-EPFL, Ericsson Radio
 * Systems AB and Canon Research Centre France S.A (collectively JJ2000
 * Partners) agree not to assert against ISO/IEC and users of the JPEG
 * 2000 Standard (Users) any of their rights under the copyright, not
 * including other intellectual property rights, for this software module
 * with respect to the usage by ISO/IEC and Users of this software module
 * or modifications thereof for use in hardware or software products
 * claiming conformance to the JPEG 2000 Standard. Those intending to use
 * this software module in hardware or software products are advised that
 * their use may infringe existing patents. The original developers of
 * this software module, JJ2000 Partners and ISO/IEC assume no liability
 * for use of this software module or modifications thereof. No license
 * or right to this software module is granted for non JPEG 2000 Standard
 * conforming products. JJ2000 Partners have full right to use this
 * software module for his/her own purpose, assign or donate this
 * software module to any third party and to inhibit third parties from
 * using this software module for non JPEG 2000 Standard conforming
 * products. This copyright notice must be included in all copies or
 * derivative works of this software module.
 * 
 * Copyright (c) 1999/2000 JJ2000 Partners.
 * */
package jj2000.j2k.entropy;

import jj2000.j2k.codestream.*;
import jj2000.j2k.wavelet.*;
import jj2000.j2k.image.*;
import jj2000.j2k.util.*;
import jj2000.j2k.*;

import java.util.*;

/**
 * This class extends ModuleSpec class for code-blocks sizes holding purposes.
 * 
 * <P>It stores the size a of code-block. 
 * */
public class CBlkSizeSpec extends ModuleSpec {

    /** Name of the option */
    private static final String optName = "Cblksiz";

    /** The maximum code-block width */
    private int maxCBlkWidth = 0;

    /** The maximum code-block height */
    private int maxCBlkHeight = 0;

    /**
     * Creates a new CBlkSizeSpec object for the specified number of tiles and
     * components.
     *
     * @param nt The number of tiles
     *
     * @param nc The number of components
     *
     * @param type the type of the specification module i.e. tile specific,
     * component specific or both.
     * */
    public CBlkSizeSpec(int nt, int nc, byte type) {
        super(nt, nc, type);
    }
    
    /**
     * Creates a new CBlkSizeSpec object for the specified number of tiles and
     * components and the ParameterList instance.
     *
     * @param nt The number of tiles
     *
     * @param nc The number of components
     *
     * @param type the type of the specification module i.e. tile specific,
     * component specific or both.
     *
     * @param imgsrc The image source (used to get the image size)
     *
     * @param pl The ParameterList instance
     * */
    public CBlkSizeSpec(int nt, int nc, byte type, ParameterList pl) {
        super(nt, nc, type);

        boolean firstVal = true;
        String param = pl.getParameter(optName);

        // Precinct partition is used : parse arguments
        StringTokenizer stk = new StringTokenizer(param);
        byte curSpecType = SPEC_DEF; // Specification type of the
                                     // current parameter
        boolean[] tileSpec = null; // Tiles concerned by the specification
        boolean[] compSpec = null; // Components concerned by the specification
        int i, xIdx, ci, ti;
        String word = null; // current word
        String errMsg = null;

        while( stk.hasMoreTokens() ) {
            word = stk.nextToken();
            
            switch(word.charAt(0)){
            
            case 't': // Tiles specification
                tileSpec = parseIdx(word, nTiles);
                if(curSpecType==SPEC_COMP_DEF) {
                    curSpecType = SPEC_TILE_COMP;
                }
                else {
                    curSpecType = SPEC_TILE_DEF;
                }
                break;
                
            case 'c': // Components specification
                compSpec = parseIdx(word, nComp);
                if(curSpecType==SPEC_TILE_DEF) {
                    curSpecType = SPEC_TILE_COMP;
                }
                else {
                    curSpecType = SPEC_COMP_DEF;
                }
                break;
            
            default:
                if ( !Character.isDigit(word.charAt(0)) ) {
                    errMsg = "Bad construction for parameter: "+word;
                    throw new IllegalArgumentException(errMsg); 
                }
                Integer dim[] = new Integer[2];
                // Get code-block's width
                try { 
                    dim[0] = new Integer(word);
                    // Check that width is not >
                    // StdEntropyCoderOptions.MAX_CB_DIM
                    if( dim[0].intValue()>StdEntropyCoderOptions.MAX_CB_DIM ){
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "width cannot be greater than "+
                            StdEntropyCoderOptions.MAX_CB_DIM;
                        throw new IllegalArgumentException(errMsg);
                    }
                    // Check that width is not <
                    // StdEntropyCoderOptions.MIN_CB_DIM
                    if( dim[0].intValue()<StdEntropyCoderOptions.MIN_CB_DIM ){
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "width cannot be less than "+
                            StdEntropyCoderOptions.MIN_CB_DIM;
                        throw new IllegalArgumentException(errMsg);
                    }
                    // Check that width is a power of 2
                    if ( dim[0].intValue() !=
                         (1<<MathUtil.log2(dim[0].intValue())) ) {
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "width must be a power of 2";
                        throw new IllegalArgumentException(errMsg);
                    }
                }
                catch( NumberFormatException e) {
                     errMsg = "'"+optName+"' option : the code-block's "+
                         "width could not be parsed.";
                    throw new IllegalArgumentException(errMsg);
                }
                // Get the next word in option
                try {
                    word = stk.nextToken();
                }
                catch (NoSuchElementException e) { 
                    errMsg = "'"+optName+"' option : could not parse the "+
                        "code-block's height";
                    throw new IllegalArgumentException(errMsg);
                    
                }
                // Get the code-block's height
                try { 
                    dim[1] = new Integer(word);
                    // Check that height is not >
                    // StdEntropyCoderOptions.MAX_CB_DIM
                    if ( dim[1].intValue()>StdEntropyCoderOptions.MAX_CB_DIM ){
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "height cannot be greater than "+
                            StdEntropyCoderOptions.MAX_CB_DIM;
                        throw new IllegalArgumentException(errMsg);
                    }
                    // Check that height is not <
                    // StdEntropyCoderOptions.MIN_CB_DIM
                    if ( dim[1].intValue()<StdEntropyCoderOptions.MIN_CB_DIM ){
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "height cannot be less than "+
                            StdEntropyCoderOptions.MIN_CB_DIM;
                        throw new IllegalArgumentException(errMsg);
                    }
                    // Check that height is a power of 2
                    if ( dim[1].intValue() !=
                         (1<<MathUtil.log2(dim[1].intValue())) ) {
                        errMsg = "'"+optName+"' option : the code-block's "+
                            "height must be a power of 2";
                        throw new IllegalArgumentException(errMsg);
                    }
                    // Check that the code-block 'area' (i.e. width*height) is
                    // not greater than StdEntropyCoderOptions.MAX_CB_AREA
                    if ( dim[0].intValue()*dim[1].intValue() > 
                         StdEntropyCoderOptions.MAX_CB_AREA )
                        {
                            errMsg = "'"+optName+"' option : The "+
                                "code-block's area (i.e. width*height) "+
                                "cannot be greater than "+
                                StdEntropyCoderOptions.MAX_CB_AREA;
                            throw new IllegalArgumentException(errMsg);
                        }
                }
                catch( NumberFormatException e) {
                    errMsg = "'"+optName+"' option : the code-block's height "+
                        "could not be parsed.";
                    throw new IllegalArgumentException(errMsg);
                }

                // Store the maximum dimensions if necessary
                if ( dim[0].intValue() > maxCBlkWidth ) {
                    maxCBlkWidth = dim[0].intValue();