libremetaverse/CSJ2K/j2k/roi/encoder/ROIMaskGenerator.cs

/*
* CVS identifier:
*
* $Id: ROIMaskGenerator.java,v 1.2 2000/11/27 15:03:51 grosbois Exp $
*
* Class:                   ROIMaskGenerator
*
* Description:             This class describes generators of ROI masks
*
*
*
* 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.
*/
using System;
using CSJ2K.j2k.image;
using CSJ2K.j2k.quantization;
using CSJ2K.j2k.wavelet;
using CSJ2K.j2k.wavelet.analysis;
using CSJ2K.j2k.codestream.writer;
using CSJ2K.j2k.util;
using CSJ2K.j2k.roi;
namespace CSJ2K.j2k.roi.encoder
{
	
	/// <summary> This class generates the ROI masks for the ROIScaler.It gives the scaler
	/// the ROI mask for the current code-block.
	/// 
	/// <P>The values are calculated from the scaling factors of the ROIs. The
	/// values with which to scale are equal to u-umin where umin is the lowest
	/// scaling factor within the block. The umin value is sent to the entropy
	/// coder to be used for scaling the distortion values.
	/// 
	/// </summary>
	/// <seealso cref="RectROIMaskGenerator">
	/// 
	/// </seealso>
	/// <seealso cref="ArbROIMaskGenerator">
	/// 
	/// </seealso>
	public abstract class ROIMaskGenerator
	{
		/// <summary> This function returns the ROIs in the image
		/// 
		/// </summary>
		/// <returns> The ROIs in the image
		/// </returns>
		virtual public ROI[] ROIs
		{
			get
			{
				return roi_array;
			}
			
		}
		
		/// <summary>Array containing the ROIs </summary>
		protected internal ROI[] roi_array;
		
		/// <summary>Number of components </summary>
		protected internal int nrc;
		
		/// <summary>Flag indicating whether a mask has been made for the current tile </summary>
		protected internal bool[] tileMaskMade;
		
		/* Flag indicating whether there are any ROIs in this tile */
		protected internal bool roiInTile;
		
		/// <summary> The constructor of the mask generator
		/// 
		/// </summary>
		/// <param name="rois">The ROIs in the image
		/// 
		/// </param>
		/// <param name="nrc">The number of components
		/// </param>
		public ROIMaskGenerator(ROI[] rois, int nrc)
		{
			this.roi_array = rois;
			this.nrc = nrc;
			tileMaskMade = new bool[nrc];
		}
		
		/// <summary> This functions gets a DataBlk with the size of the current code-block
		/// and fills it with the ROI mask. The lowest scaling value in the mask
		/// for this code-block is returned by the function to be used for
		/// modifying the rate distortion estimations.
		/// 
		/// </summary>
		/// <param name="db">The data block that is to be filled with the mask
		/// 
		/// </param>
		/// <param name="sb">The root of the current subband tree
		/// 
		/// </param>
		/// <param name="magbits">The number of magnitude bits in this code-block
		/// 
		/// </param>
		/// <param name="c">Component number
		/// 
		/// </param>
		/// <returns> Whether or not a mask was needed for this tile 
		/// </returns>
		public abstract bool getROIMask(DataBlkInt db, Subband sb, int magbits, int c);
		
		/// <summary> This function generates the ROI mask for the entire tile. The mask is
		/// generated for one component. This method is called once for each tile
		/// and component.
		/// 
		/// </summary>
		/// <param name="sb">The root of the subband tree used in the decomposition
		/// 
		/// </param>
		/// <param name="magbits">The max number of magnitude bits in any code-block
		/// 
		/// </param>
		/// <param name="n">component number
		/// </param>
		public abstract void  makeMask(Subband sb, int magbits, int n);
		
		/// <summary> This function is called every time the tile is changed to indicate
		/// that there is need to make a new mask
		/// </summary>
		public virtual void  tileChanged()
		{
			for (int i = 0; i < nrc; i++)
				tileMaskMade[i] = false;
		}
	}
}