/*
 * $RCSfile: CBlkWTData.java,v $
 * $Revision: 1.1 $
 * $Date: 2005-02-11 05:02:30 $
 * $State: Exp $
 *
 * Class:                   CBlkWTData
 *
 * Description:             Storage for code-blocks of WT data.
 *
 *
 *
 * COPYRIGHT:
 *
 * This software module was originally developed by Raphaël Grosbois and
 * Diego Santa Cruz (Swiss Federal Institute of Technology-EPFL); Joel
 * Askelöf (Ericsson Radio Systems AB); and Bertrand Berthelot, David
 * Bouchard, Félix 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.wavelet.analysis;

import jj2000.j2k.image.*;

/**
 * This is a generic abstract class to store a code-block of wavelet data, be
 * it quantized or not. This class does not have the notion of
 * components. Therefore, it should be used for data from a single
 * component. Subclasses should implement the different types of storage
 * (<tt>int</tt>, <tt>float</tt>, etc.).
 *
 * <P>The data is always stored in one array, of the type matching the data
 * type (i.e. for 'int' it's an 'int[]'). The data should be stored in the
 * array in standard scan-line order. That is the samples go from the top-left
 * corner of the code-block to the lower-right corner by line and then column.
 *
 * <P>The member variable 'offset' gives the index in the array of the first
 * data element (i.e. the top-left coefficient). The member variable 'scanw'
 * gives the width of the scan that is used to store the data, that can be
 * different from the width of the block. Element '(x,y)' of the code-block
 * (i.e. '(0,0)' is the top-left coefficient), will appear at position
 * 'offset+y*scanw+x' in the array of data.
 *
 * <P>The classes <tt>CBlkWTDataInt</tt> and <tt>CBlkWTDataFloat</tt>
 * provide implementations for <tt>int</tt> and <tt>float</tt> types
 * respectively.
 *
 * <P>The types of data are the same as those defined by the 'DataBlk' class.
 *
 * @see CBlkWTDataSrc
 *
 * @see jj2000.j2k.quantization.quantizer.CBlkQuantDataSrcEnc
 *
 * @see DataBlk
 *
 * @see CBlkWTDataInt
 *
 * @see CBlkWTDataFloat
 * */
public abstract class CBlkWTData {

    /** The horizontal coordinate of the upper-left corner of the code-block */
    public int ulx;

    /** The vertical coordinate of the upper left corner of the code-block */
    public int uly;

    /** The horizontal index of the code-block, within the subband */
    public int n;

    /** The vertical index of the code-block, within the subband */
    public int m;

    /** The subband in which this code-block is found */
    public SubbandAn sb;

    /** The width of the code-block */
    public int w;

    /** The height of the code-block */
    public int h;

    /** The offset in the array of the top-left coefficient */
    public int offset;

    /** The width of the scanlines used to store the data in the array */
    public int scanw;

    /** The number of magnitude bits in the integer representation. This is
     * only used for quantized wavelet data. */
    public int magbits;

    /** The WMSE scaling factor (multiplicative) to apply to the distortion
     * measures of the data of this code-block. By default it is 1.*/
    public float wmseScaling = 1f;

    /** The value by which the absolute value of the data has to be divided in
     * order to get the real absolute value. This value is useful to obtain
     * the complement of 2 representation of a coefficient that is currently
     * using the sign-magnitude representation. */
    public double convertFactor = 1.0;

    /**
     * The quantization step size of the code-block. The value is updated by
     * the quantizer module
     * */
    public double stepSize = 1.0;

    /**
     * Number of ROI coefficients in the code-block
     * */
    public int nROIcoeff = 0;

    /** Number of ROI magnitude bit-planes */
    public int nROIbp = 0;

    /**
     * Returns the data type of the <tt>CBlkWTData</tt> object, as
     * defined in the DataBlk class.
     *
     * @return The data type of the object, as defined in the DataBlk class.
     *
     * @see DataBlk
     * */
    public abstract int getDataType();

    /**
     * Returns the array containing the data, or null if there is no data. The
     * returned array is of the type returned by <tt>getDataType()</tt> (e.g.,
     * for <tt>TYPE_INT</tt>, it is a <tt>int[]</tt>).
     *
     * <P>Each implementing class should provide a type specific equivalent
     * method (e.g., <tt>getDataInt()</tt> in <tt>DataBlkInt</tt>) which
     * returns an array of the correct type explicitely and not through an
     * <tt>Object</tt>.
     *
     * @return The array containing the data, or <tt>null</tt> if there is no
     * data.
     *
     * @see #getDataType
     * */
    public abstract Object getData();

    /**
     * Sets the data array to the specified one. The type of the specified
     * data array must match the one returned by <tt>getDataType()</tt> (e.g.,
     * for <tt>TYPE_INT</tt>, it should be a <tt>int[]</tt>). If the wrong
     * type of array is given a <tt>ClassCastException</tt> will be thrown.
     *
     * <P>The size of the array is not necessarily checked for consistency
     * with <tt>w</tt> and <tt>h</tt> or any other fields.
     *
     * <P>Each implementing class should provide a type specific equivalent
     * method (e.g., <tt>setDataInt()</tt> in <tt>DataBlkInt</tt>) which takes
     * an array of the correct type explicetely and not through an
     * <tt>Object</tt>.
     *
     * @param arr The new data array to use
     *
     * @see #getDataType
     * */
    public abstract void setData(Object arr);

    /**
     * Returns a string of informations about the DataBlk
     *
     * @return Block dimensions and progressiveness in a string
     * */
    public String toString(){
	String typeString = "";
	switch(getDataType()){
	case  DataBlk.TYPE_BYTE:
	    typeString = "Unsigned Byte";
	    break;
	case  DataBlk.TYPE_SHORT:
	    typeString = "Short";
	    break;
	case  DataBlk.TYPE_INT:
	    typeString = "Integer";
	    break;
	case  DataBlk.TYPE_FLOAT:
	    typeString = "Float";
	    break;
	}

	return
	    "CBlkWTData: "+
	    "ulx= " + ulx + ", uly= " + uly +
	    ", code-block("+m+","+n+"), width= "+w+
	    ", height= "+h+", offset= "+offset+", scan-width="+scanw+
	    ", type= "+typeString + ", sb= "+sb+", num. ROI coeff="+
            nROIcoeff+", num. ROI bit-planes="+nROIbp;
    }
}
