/*
 * $RCSfile: ImgData.java,v $
 * $Revision: 1.1 $
 * $Date: 2005-02-11 05:02:12 $
 * $State: Exp $
 *
 * Interface:           ImgData
 *
 * Description:         The interface for classes that provide image
 *                      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.image;

import java.awt.Point;
/**
 * This interface defines methods to access image attributes (width, height,
 * number of components, etc.). The image can be tiled or not (i.e. if the
 * image is not tiled then there is only 1 tile). It should be implemented by
 * all classes that provide image data, such as image file readers, color
 * transforms, wavelet transforms, etc. This interface, however, does not
 * define methods to transfer image data (i.e. pixel data), that is defined by
 * other interfaces, such as 'BlkImgDataSrc'.
 *
 * @see BlkImgDataSrc
 * */
public interface ImgData {
    /**
     * Returns the overall width of the current tile in pixels. This is the
     * tile's width without accounting for any component subsampling. This is
     * also referred as the reference grid width in the current tile.
     *
     * @return The total current tile's width in pixels.
     * */
    public int getTileWidth();

    /**
     * Returns the overall height of the current tile in pixels. This is the
     * tile's height without accounting for any component subsampling. This is
     * also referred as the reference grid height in the current tile.
     *
     * @return The total current tile's height in pixels.
     * */
    public int getTileHeight();

    /** Returns the nominal tiles width */
    public int getNomTileWidth();

    /** Returns the nominal tiles height */
    public int getNomTileHeight();

    /**
     * Returns the overall width of the image in pixels. This is the image's
     * width without accounting for any component subsampling or tiling.
     *
     * @return The total image's width in pixels.
     * */
    public int getImgWidth();

    /**
     * Returns the overall height of the image in pixels. This is the image's
     * height without accounting for any component subsampling or tiling.
     *
     * @return The total image's height in pixels.
     * */
    public int getImgHeight();

    /**
     * Returns the number of components in the image.
     *
     * @return The number of components in the image.
     * */
    public int 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.
     *
     * @param c The index of the component (between 0 and N-1)
     *
     * @return The horizontal subsampling factor of component 'c'
     *
     * @see ImgData
     * */
    public int getCompSubsX(int c);

    /**
     * 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.
     *
     * @param c The index of the component (between 0 and N-1)
     *
     * @return The vertical subsampling factor of component 'c'
     *
     * @see ImgData
     * */
    public int getCompSubsY(int c);

    /**
     * Returns the width in pixels of the specified tile-component
     *
     * @param t Tile index
     *
     * @param c The index of the component, from 0 to N-1.
     *
     * @return The width in pixels of component <tt>c</tt> in tile<tt>t</tt>.
     * */
    public int getTileCompWidth(int t,int c);

    /**
     * Returns the height in pixels of the specified tile-component.
     *
     * @param t The tile index.
     *
     * @param c The index of the component, from 0 to N-1.
     *
     * @return The height in pixels of component <tt>c</tt> in tile
     * <tt>t</tt>.
     * */
    public int getTileCompHeight(int t,int c);

    /**
     * Returns the width in pixels of the specified component in the overall
     * image.
     *
     * @param c The index of the component, from 0 to N-1.
     *
     * @return The width in pixels of component <tt>c</tt> in the overall
     * image.
     * */
    public int getCompImgWidth(int c);

    /**
     * Returns the height in pixels of the specified component in the overall
     * image.
     *
     * @param c The index of the component, from 0 to N-1.
     *
     * @return The height in pixels of component <tt>n</tt> in the overall
     * image.
     * */
    public int getCompImgHeight(int c);

    /**
     * Returns the number of bits, referred to as the "range bits",
     * corresponding to the nominal range of the image data in the specified
     * component. If this number is <i>n</b> then for unsigned data the
     * nominal range is between 0 and 2^b-1, and for signed data it is between
     * -2^(b-1) and 2^(b-1)-1. In the case of transformed data which is not in
     * the image domain (e.g., wavelet coefficients), this method returns the
     * "range bits" of the image data that generated the coefficients.
     *
     * @param c The index of the component.
     *
     * @return The number of bits corresponding to the nominal range of the
     * image data (in the image domain).
     * */
    public int getNomRangeBits(int c);
    /**
     * Changes the current tile, given the new indices. An
     * IllegalArgumentException is thrown if the coordinates do not correspond
     * to a valid tile.
     *
     * @param x The horizontal index of the tile.
     *
     * @param y The vertical index of the new tile.
     * */
    public void setTile(int x,int y);

    /**
     * Advances to the next tile, in standard scan-line order (by rows then
     * columns). An NoNextElementException is thrown if the current tile is
     * the last one (i.e. there is no next tile).
     * */
    public void nextTile();

    /**
     * Returns the indixes of the current tile. These are the horizontal and
     * vertical indexes of the current tile.
     *
     * @param co If not null this object is used to return the information. If
     * null a new one is created and returned.
     *
     * @return The current tile's indices (vertical and horizontal indexes).
     * */
    public Point getTile(Point co);

    /**
     * Returns the index of the current tile, relative to a standard scan-line
     * order.
     *
     * @return The current tile's index (starts at 0).
     * */
    public int getTileIdx();

    /** Returns the horizontal tile partition offset in the reference grid */
    public int getTilePartULX();

    /** Returns the vertical tile partition offset in the reference grid */
    public int getTilePartULY();

    /**
     * Returns the horizontal coordinate of the upper-left corner of the
     * specified component in the current tile.
     *
     * @param c The index of the component.
     * */
    public int getCompULX(int c);

    /**
     * Returns the vertical coordinate of the upper-left corner of the
     * specified component in the current tile.
     *
     * @param c The index of the component.
     * */
    public int getCompULY(int c);

    /**
     * Returns the horizontal coordinate of the image origin, the top-left
     * corner, in the canvas system, on the reference grid.
     *
     * @return The horizontal coordinate of the image origin in the canvas
     * system, on the reference grid.
     * */
    public int getImgULX();

    /**
     * Returns the vertical coordinate of the image origin, the top-left
     * corner, in the canvas system, on the reference grid.
     *
     * @return The vertical coordinate of the image origin in the canvas
     * system, on the reference grid.
     * */
    public int getImgULY();

    /**
     * Returns the number of tiles in the horizontal and vertical directions.
     *
     * @param co If not null this object is used to return the information. If
     * null a new one is created and returned.
     *
     * @return The number of tiles in the horizontal (Point.x) and vertical
     * (Point.y) directions.
     * */
    public Point getNumTiles(Point co);

    /**
     * Returns the total number of tiles in the image.
     *
     * @return The total number of tiles in the image.
     * */
    public int getNumTiles();

}
