multiresimgdataadapter.java

jpeg2000算法实现

/* 
 * CVS identifier:
 * 
 * $Id: MultiResImgDataAdapter.java,v 1.7 2000/09/05 09:26:27 grosbois Exp $
 * 
 * Class:                   MultiResImgDataAdapter
 * 
 * Description:             A default implementation of the MultiResImgData
 *                          interface that has and MultiResImgData source
 *                          and just returns the values of the source.
 * 
 * 
 * 
 * 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.wavelet.synthesis;

import jj2000.j2k.image.*;

/**
 * This class provides a default implementation of the methods in the
 * 'MultiResImgData' interface. The default implementation is just to return the
 * value of the source, where the source is another 'MultiResImgData' object.
 *
 * <P>This abstract class can be used to facilitate the development of other
 * classes that implement 'MultiResImgData'. For example a dequantizer can
 * inherit from this class and all the trivial methods do not have to be
 * reimplemented.
 *
 * <P>If the default implementation of a method provided in this class does
 * not suit a particular implementation of the 'MultiResImgData' interface, the
 * method can be overriden to implement the proper behaviour.
 *
 * @see MultiResImgData
 * */
public abstract class MultiResImgDataAdapter implements MultiResImgData {

    /** Index of the current tile */
    protected int tIdx = 0;

    /** The MultiResImgData source */
    protected MultiResImgData mressrc;

    /**
     * Instantiates the MultiResImgDataAdapter object specifying the
     * MultiResImgData source.
     *
     * @param src From where to obrtain the MultiResImgData values.
     *
     *
     * */
    protected MultiResImgDataAdapter(MultiResImgData src) {
        mressrc = src;
    }

//      /**
//       * Returns the maximum resolution level available from the
//       * bit stream. The number of resolution levels available is the
//       * returned value plus 1.
//       *
//       * <P>This default implementation returns the value of the source.
//       *
//       * @return The maximum resolution level available.
//       *
//       *
//       * */
//      public int getMaxResLvl() {
//          return mressrc.getMaxResLvl();
//      }
    
    /**
     * Returns the overall width of the current tile in pixels, for
     * the given resolution level. This is the tile's width without
     * accounting for any component subsampling.
     *
     * <P>This default implementation returns the value of the source.
     *
     * @param rl The resolution level, from 0 to L.
     *
     * @return The total current tile's width in pixels.
     *
     *
     * */
    public int getWidth(int rl) {
        return mressrc.getWidth(rl);
    }

    /**
     * Returns the overall height of the current tile in pixels, for
     * the given resolution level. This is the tile's height without
     * accounting for any component subsampling.
     *
     * <P>This default implementation returns the value of the source.
     *
     * @param rl The resolution level, from 0 to L.
     *
     * @return The total current tile's height in pixels.
     *
     *
     * */
    public int getHeight(int rl) {
        return mressrc.getHeight(rl);
    }

    /**
     * Returns the overall width of the image in pixels, for the given
     * resolution level. This is the image's width without accounting
     * for any component subsampling or tiling.
     *
     * <P>This default implementation returns the value of the source.
     *
     * @param rl The resolution level, from 0 to L.
     *
     * @return The total image's width in pixels.
     *
     *
     * */
    public int getImgWidth(int rl) {
        return mressrc.getImgWidth(rl);
    }

    /**
     * Returns the overall height of the image in pixels, for the
     * given resolution level. This is the image's height without
     * accounting for any component subsampling or tiling.
     *
     * <P>This default implementation returns the value of the source.
     *
     * @param rl The resolution level, from 0 to L.
     *
     * @return The total image's height in pixels.
     *
     *
     * */
    public int getImgHeight(int rl) {
        return mressrc.getImgHeight(rl);
    }
    
    /**
     * Returns the number of components in the image.
     *
     * <P>This default implementation returns the value of the source.
     *
     * @return The number of components in the image.
     *
     *
     * */
    public int getNumComps() {
        return mressrc.getNumComps();
    }

    /**
     * Returns the component subsampling factor in the horizontal direction,
     * for the specified component. This is, approximately, the ratio of
     * dimensions between the reference grid and the component itself, see the
     * 'ImgData' interface desription for details.
     *
     * <P>This default implementation returns the value of the source.
     *
     * @param n The index of the component (between 0 and N-1)
     *
     * @return The horizontal subsampling factor of component 'n'
     *
     * @see ImgData
     *
     *
     * */
    public int getCompSubsX(int n) {
        return mressrc.getCompSubsX(n);
    }

    /**
     * Returns the component subsampling factor in the vertical direction, for
     * the specified component. This is, approximately, the ratio of
     * dimensions between the reference grid and the component itself, see the
     * 'ImgData' interface desription for details.
     *
     * <P>This default implementation returns the value of the source.
     *
     * @param n The index of the component (between 0 and N-1)
     *
     * @return The vertical subsampling factor of component 'n'
     *
     * @see ImgData
     *
     *
     * */
    public int getCompSubsY(int n) {
        return mressrc.getCompSubsY(n);
    }

    /**
     * Returns the width in pixels of the specified component
     * in the current tile, for the given resolution level.
     *
     * <P>This default implementation returns the value of the source.
     *
     * @param n The index of the component, from 0 to N-1.
     *
     * @param rl The resolution level, from 0 to L.
     *
     * @return The width in pixels of component <tt>n</tt> in the
     * current tile.
     *
     *
     * */
    public int getCompWidth(int n, int rl) {
        return mressrc.getCompWidth(n,rl);
    }

    /**
     * Returns the height in pixels of the specified component
     * in the current tile, for the given resolution level.
     *
     * <P>This default implementation returns the value of the source.
     *
     * @param n The index of the component, from 0 to N-1.
     *
     * @param rl The resolution level, from 0 to L.
     *
     * @return The height in pixels of component <tt>n</tt> in the