/*  * CVS identifier: *  * $Id: CBlkQuantDataSrcDec.java,v 1.8 2001/02/14 17:36:26 grosbois Exp $ *  * Class:                   CBlkQuantDataSrcDec *  * Description:             Interface that defines a source of *                          quantized wavelet data to be transferred in a *                          code-block by code-block basis (decoder side). *  *  *  * 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.quantization.dequantizer;import jj2000.j2k.wavelet.synthesis.*;import jj2000.j2k.entropy.decoder.*;import jj2000.j2k.image.*;/** * This interface defines a source of quantized wavelet coefficients and * methods to transfer them in a code-block by code-block basis, fro the * decoder side. In each call to 'getCodeBlock()' or 'getInternCodeBlock()' a * new code-block is returned. * * <P>This class is the source of data for the dequantizer. See the * 'Dequantizer' class. * * <P>Code-block data is returned in sign-magnitude representation, instead of * the normal two's complement one. Only integral types are used. The sign * magnitude representation is more adequate for entropy coding. In sign * magnitude representation, the most significant bit is used for the sign (0 * if positive, 1 if negative) and the magnitude of the coefficient is stored * in the next M most significant bits. The rest of the bits (least * significant bits) can contain a fractional value of the quantized * coefficient. The number 'M' of magnitude bits is communicated in the * 'magbits' member variable of the 'CBlkWTData'. * * @see InvWTData * @see CBlkWTDataSrcDec * @see Dequantizer * @see EntropyDecoder * */public interface CBlkQuantDataSrcDec extends InvWTData {    /**     * Returns the number of code-blocks in a subband, along the horizontal     * and vertical dimensions.     *     * @param sb The subband for which to return the number of blocks.     *     * @param n The component where the subband is.     *     * @param co If not null the values are returned in this object. If null a     * new object is allocated and returned.     *     * @return The number of code-blocks along the horizontal dimension in     * 'Coord.x' and the number of code-blocks along the vertical dimension in     * 'Coord.y'.     * */    public Coord getNumCodeBlocks(SubbandSyn sb, int n, Coord co);    /**     * Returns the specified code-block in the current tile for the specified     * component, as a copy (see below).     *     * <P>The returned code-block may be progressive, which is indicated by     * the 'progressive' variable of the returned 'DataBlk' object. If a     * code-block is progressive it means that in a later request to this     * method for the same code-block it is possible to retrieve data which is     * a better approximation, since meanwhile more data to decode for the     * code-block could have been received. If the code-block is not     * progressive then later calls to this method for the same code-block     * will return the exact same data values.     *     * <P>The data returned by this method is always a copy of the internal     * data of this object, if any, and it can be modified "in place" without     * any problems after being returned. The 'offset' of the returned data is     * 0, and the 'scanw' is the same as the code-block width. See the     * 'DataBlk' class.     *     * <P>The 'ulx' and 'uly' members of the returned 'DataBlk' object contain     * the coordinates of the top-left corner of the block, with respect to     * the tile, not the subband.     *     * @param c The component for which to return the next code-block.     *     * @param m The vertical index of the code-block to return, in the     * specified subband.     *     * @param n The horizontal index of the code-block to return, in the     * specified subband.     *     * @param sb The subband in which the code-block to return is.     *     * @param cblk If non-null this object will be used to return the new     * code-block. If null a new one will be allocated and returned. If the     * "data" array of the object is non-null it will be reused, if possible,     * to return the data.     *     * @return The next code-block in the current tile for component 'n', or     * null if all code-blocks for the current tile have been returned.     *     * @see DataBlk     * */    public DataBlk getCodeBlock(int c, int m, int n, SubbandSyn sb,                                  DataBlk cblk);    /**     * Returns the specified code-block in the current tile for the specified     * component (as a reference or copy).     *     * <P>The returned code-block may be progressive, which is indicated by     * the 'progressive' variable of the returned 'DataBlk' object. If a     * code-block is progressive it means that in a later request to this     * method for the same code-block it is possible to retrieve data which is     * a better approximation, since meanwhile more data to decode for the     * code-block could have been received. If the code-block is not     * progressive then later calls to this method for the same code-block     * will return the exact same data values.     *     * <P>The data returned by this method can be the data in the internal     * buffer of this object, if any, and thus can not be modified by the     * caller. The 'offset' and 'scanw' of the returned data can be     * arbitrary. See the 'DataBlk' class.     *     * <P>The 'ulx' and 'uly' members of the returned 'DataBlk' object contain     * the coordinates of the top-left corner of the block, with respect to     * the tile, not the subband.     *     * @param c The component for which to return the next code-block.     *     * @param m The vertical index of the code-block to return, in the     * specified subband.     *     * @param n The horizontal index of the code-block to return, in the     * specified subband.     *     * @param sb The subband in which the code-block to return is.     *     * @param cblk If non-null this object will be used to return the new     * code-block. If null a new one will be allocated and returned. If the     * "data" array of the object is non-null it will be reused, if possible,     * to return the data.     *     * @return The next code-block in the current tile for component 'n', or     * null if all code-blocks for the current tile have been returned.     *     * @see DataBlk     * */    public DataBlk getInternCodeBlock(int c, int m, int n, SubbandSyn sb,                                        DataBlk cblk);}