/*
* CVS Identifier:
*
* $Id: InvCompTransf.java,v 1.19 2001/10/29 20:06:35 qtxjoas Exp $
*
* Class:               InvCompTransf
*
* Description:         Inverse Component transformations applied to tiles
*
*
*
* 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.wavelet.synthesis;
using CSJ2K.j2k.decoder;
using CSJ2K.j2k.image;
using CSJ2K.j2k.util;
using CSJ2K.j2k;
namespace CSJ2K.j2k.image.invcomptransf
{
	
	/// <summary> This class apply inverse component transformations to the tiles depending
	/// on specification read from the codestream header. These transformations can
	/// be used to improve compression efficiency but are not related to colour
	/// transforms used to map colour values for display purposes. JPEG 2000 part I
	/// defines 2 component transformations: RCT (Reversible Component
	/// Transformation) and ICT (Irreversible Component Transformation).
	/// 
	/// </summary>
	/// <seealso cref="ModuleSpec">
	/// 
	/// </seealso>
	public class InvCompTransf:ImgDataAdapter, BlkImgDataSrc
	{
		/// <summary> Returns the parameters that are used in this class and implementing
		/// classes. It returns a 2D String array. Each of the 1D arrays is for a
		/// different option, and they have 4 elements. The first element is the
		/// option name, the second one is the synopsis, the third one is a long
		/// description of what the parameter is and the fourth is its default
		/// value. The synopsis or description may be 'null', in which case it is
		/// assumed that there is no synopsis or description of the option,
		/// respectively. Null may be returned if no options are supported.
		/// 
		/// </summary>
		/// <returns> the options name, their synopsis and their explanation, 
		/// or null if no options are supported.
		/// 
		/// </returns>
		public static System.String[][] ParameterInfo
		{
			get
			{
				return pinfo;
			}
			
		}
		/// <summary> Returns true if this transform is reversible in current
		/// tile. Reversible component transformations are those which operation
		/// can be completely reversed without any loss of information (not even
		/// due to rounding).
		/// 
		/// </summary>
		/// <returns> Reversibility of component transformation in current
		/// tile
		/// 
		/// </returns>
		virtual public bool Reversible
		{
			get
			{
				switch (transfType)
				{
					
					case NONE: 
					case INV_RCT: 
						return true;
					
					case INV_ICT: 
						return false;
					
					default: 
						throw new System.ArgumentException("Non JPEG 2000 part I" + " component transformation");
					
				}
			}
			
		}
		
		/// <summary>Identifier for no component transformation. Value is 0. </summary>
		public const int NONE = 0;
		
		/// <summary>The prefix for inverse component transformation options: 'M' </summary>
		public const char OPT_PREFIX = 'M';
		
		/// <summary>The list of parameters that is accepted by the inverse
		/// component transformation module. They start with 'M'. 
		/// </summary>
		//UPGRADE_NOTE: Final was removed from the declaration of 'pinfo'. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1003'"
		private static readonly System.String[][] pinfo = null;
		
		/// <summary>Identifier for the Inverse Reversible Component Transformation
		/// (INV_RCT). Value is 1. 
		/// </summary>
		public const int INV_RCT = 1;
		
		/// <summary>Identifier for the Inverse Irreversible Component
		/// Transformation (INV_ICT). Value is 2 
		/// </summary>
		public const int INV_ICT = 2;
		
		/// <summary>The source of image data </summary>
		private BlkImgDataSrc src;
		
		/// <summary>The component transformations specifications </summary>
		private CompTransfSpec cts;
		
		/// <summary>The wavelet filter specifications </summary>
		private SynWTFilterSpec wfs;
		
		/// <summary>The type of the current component transformation JPEG 2000
		/// part I only support NONE, FORW_RCT and FORW_ICT types
		/// </summary>
		private int transfType = NONE;
		
		/// <summary>Buffer for each component of output data </summary>
		private int[][] outdata = new int[3][];
		
		/// <summary>Block used to request component 0 </summary>
		private DataBlk block0;
		
		/// <summary>Block used to request component 1 </summary>
		private DataBlk block1;
		
		/// <summary>Block used to request component 2 </summary>
		private DataBlk block2;
		
		/// <summary>Data block used only to store coordinates and progressiveness 
		/// of the buffered blocks 
		/// </summary>
		private DataBlkInt dbi = new DataBlkInt();
		
		/// <summary>The bit-depths of un-transformed components </summary>
		private int[] utdepth;
		
		/// <summary>Flag indicating whether the decoder should skip the component 
		/// transform
		/// </summary>
		private bool noCompTransf = false;
		
		/// <summary> Constructs a new ForwCompTransf object that operates on the
		/// specified source of image data.
		/// 
		/// </summary>
		/// <param name="imgSrc">The source from where to get the data to be
		/// transformed
		/// 
		/// </param>
		/// <param name="decSpec">The decoder specifications
		/// 
		/// </param>
		/// <param name="utdepth">The bit depth of the un-transformed components 
		/// 
		/// </param>
		/// <param name="pl">The command line optinons of the decoder
		/// 
		/// </param>
		/// <seealso cref="BlkImgDataSrc">
		/// 
		/// </seealso>
		public InvCompTransf(BlkImgDataSrc imgSrc, DecoderSpecs decSpec, int[] utdepth, ParameterList pl):base(imgSrc)
		{
			this.cts = decSpec.cts;
			this.wfs = decSpec.wfs;
			src = imgSrc;
			this.utdepth = utdepth;
			noCompTransf = !(pl.getBooleanParameter("comp_transf"));
		}
		
		/// <summary> Returns a string with a descriptive text of which inverse component
		/// transformation is used. This can be either "Inverse RCT" or "Inverse
		/// ICT" or "No component transformation" depending on the current tile.
		/// 
		/// </summary>
		/// <returns> A descriptive string
		/// 
		/// </returns>
		public override System.String ToString()
		{
			switch (transfType)
			{
				
				case INV_RCT: 
					return "Inverse RCT";
				
				case INV_ICT: 
					return "Inverse ICT";
				
				case NONE: 
					return "No component transformation";
				
				default: 
					throw new System.ArgumentException("Non JPEG 2000 part I" + " component transformation");
				
			}
		}
		
		/// <summary> Returns the position of the fixed point in the specified
		/// component. This is the position of the least significant integral
		/// (i.e. non-fractional) bit, which is equivalent to the number of
		/// fractional bits. For instance, for fixed-point values with 2 fractional
		/// bits, 2 is returned. For floating-point data this value does not apply
		/// and 0 should be returned. Position 0 is the position of the least
		/// significant bit in the data.
		/// 
		/// <P>This default implementation assumes that the number of fractional
		/// bits is not modified by the component mixer.
		/// 
		/// </summary>
		/// <param name="c">The index of the component.
		/// 
		/// </param>
		/// <returns> The value of the fixed point position of the source since the
		/// color transform does not affect it.
		/// 
		/// </returns>
		public virtual int getFixedPoint(int c)
		{
			return src.getFixedPoint(c);
		}
		
		/// <summary> Calculates the bitdepths of the transformed components, given the
		/// bitdepth of the un-transformed components and the component
		/// tranformation type.
		/// 
		/// </summary>
		/// <param name="utdepth">The bitdepth of each un-transformed component
		/// 
		/// </param>
		/// <param name="ttype">The type ID of the inverse component tranformation
		/// 
		/// </param>
		/// <param name="tdepth">If not null the results are stored in this
		/// array, otherwise a new array is allocated and returned.
		/// 
		/// </param>
		/// <returns> The bitdepth of each transformed component.
		/// 
		/// </returns>
		public static int[] calcMixedBitDepths(int[] utdepth, int ttype, int[] tdepth)
		{
			
			if (utdepth.Length < 3 && ttype != NONE)
			{
				throw new System.ArgumentException();
			}
			
			if (tdepth == null)
			{
				tdepth = new int[utdepth.Length];
			}
			
			switch (ttype)
			{
				
				case NONE: 
					Array.Copy(utdepth, 0, tdepth, 0, utdepth.Length);
					break;
				
				case INV_RCT: 
					if (utdepth.Length > 3)
					{
						Array.Copy(utdepth, 3, tdepth, 3, utdepth.Length - 3);
					}
					// The formulas are:
					// tdepth[0] = ceil(log2(2^(utdepth[0])+2^utdepth[1]+
					//                        2^(utdepth[2])))-2+1
					// tdepth[1] = ceil(log2(2^(utdepth[0])+2^(utdepth[1])-1))+1
					// tdepth[2] = ceil(log2(2^(utdepth[1])+2^(utdepth[2])-1))+1
					// The MathUtil.log2(x) function calculates floor(log2(x)), so we
					// use 'MathUtil.log2(2*x-1)+1', which calculates ceil(log2(x))
					// for any x>=1, x integer.
					tdepth[0] = MathUtil.log2((1 << utdepth[0]) + (2 << utdepth[1]) + (1 << utdepth[2]) - 1) - 2 + 1;
					tdepth[1] = MathUtil.log2((1 << utdepth[2]) + (1 << utdepth[1]) - 1) + 1;
					tdepth[2] = MathUtil.log2((1 << utdepth[0]) + (1 << utdepth[1]) - 1) + 1;
					break;
				
				case INV_ICT: 
					if (utdepth.Length > 3)
					{
						Array.Copy(utdepth, 3, tdepth, 3, utdepth.Length - 3);
					}
					// The MathUtil.log2(x) function calculates floor(log2(x)), so we
					// use 'MathUtil.log2(2*x-1)+1', which calculates ceil(log2(x))
					// for any x>=1, x integer.
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					tdepth[0] = MathUtil.log2((int) System.Math.Floor((1 << utdepth[0]) * 0.299072 + (1 << utdepth[1]) * 0.586914 + (1 << utdepth[2]) * 0.114014) - 1) + 1;
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					tdepth[1] = MathUtil.log2((int) System.Math.Floor((1 << utdepth[0]) * 0.168701 + (1 << utdepth[1]) * 0.331299 + (1 << utdepth[2]) * 0.5) - 1) + 1;
					//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
					tdepth[2] = MathUtil.log2((int) System.Math.Floor((1 << utdepth[0]) * 0.5 + (1 << utdepth[1]) * 0.418701 + (1 << utdepth[2]) * 0.081299) - 1) + 1;
					break;
				}
			
			return tdepth;
		}
		
		/// <summary> Returns the number of bits, referred to as the "range bits",
		/// corresponding to the nominal range of the data in the specified
		/// component. If this number is <i>b</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.
		/// 
		/// </summary>
		/// <param name="c">The index of the component.
		/// 
		/// </param>
		/// <returns> The bitdepth of un-transformed component 'c'.
		/// 
		/// </returns>
		public override int getNomRangeBits(int c)
		{
			return utdepth[c];
		}
		
		/// <summary> Apply inverse component transformation associated with the current
		/// tile. If no component transformation has been requested by the user,
		/// data are not modified.
		/// 
		/// <P>This method calls the getInternCompData() method, but respects the
		/// definitions of the getCompData() method defined in the BlkImgDataSrc
		/// interface.
		/// 
		/// </summary>
		/// <param name="blk">Determines the rectangular area to return, and the
		/// data is returned in this object.
		/// 
		/// </param>
		/// <param name="c">Index of the output component.
		/// 
		/// </param>
		/// <returns> The requested DataBlk
		/// 
		/// </returns>
		/// <seealso cref="BlkImgDataSrc.getCompData">
		/// 
		/// </seealso>
		public virtual DataBlk getCompData(DataBlk blk, int c)
		{
			// If requesting a component whose index is greater than 3 or there is
			// no transform return a copy of data (getInternCompData returns the
			// actual data in those cases)
			if (c >= 3 || transfType == NONE || noCompTransf)
			{
				return src.getCompData(blk, c);
			}
			else
			{
				// We can use getInternCompData (since data is a copy anyways)
				return getInternCompData(blk, c);
			}
		}
		
		/// <summary> Apply the inverse component transformation associated with the current
		/// tile. If no component transformation has been requested by the user,
		/// data are not modified. Else, appropriate method is called (invRCT or
		/// invICT).
		/// 
		/// </summary>
		/// <seealso cref="invRCT">
		/// 
		/// </seealso>
		/// <seealso cref="invICT">
		/// 
		/// </seealso>
		/// <param name="blk">Determines the rectangular area to return.
		/// 
		/// </param>
		/// <param name="c">Index of the output component.
		/// 
		/// </param>
		/// <returns> The requested DataBlk
		/// 
		/// </returns>
		public virtual DataBlk getInternCompData(DataBlk blk, int c)
		{
			// if specified in the command line that no component transform should
			// be made, return original data
			if (noCompTransf)
				return src.getInternCompData(blk, c);
			
			switch (transfType)
			{
				
				case NONE: 
					return src.getInternCompData(blk, c);
				
				
				case INV_RCT: 
					return invRCT(blk, c);
				
				case INV_ICT: 
					return invICT(blk, c);
				
				default: 
					throw new System.ArgumentException("Non JPEG 2000 part I" + " component transformation");
				
			}
		}
		
		/// <summary> Apply inverse component transformation to obtain requested component
		/// from specified block of data. Whatever the type of requested DataBlk,
		/// it always returns a DataBlkInt.
		/// 
		/// </summary>
		/// <param name="blk">Determine the rectangular area to return 
		/// 
		/// </param>
		/// <param name="c">The index of the requested component
		/// 
		/// </param>
		/// <returns> Data of requested component
		/// 
		/// </returns>
		private DataBlk invRCT(DataBlk blk, int c)
		{
			// If the component number is three or greater, return original data
			if (c >= 3 && c < NumComps)
			{
				// Requesting a component whose index is greater than 3
				return src.getInternCompData(blk, c);
			}
			// If asking a component for the first time for this block,
			// do transform for the 3 components
			else if ((outdata[c] == null) || (dbi.ulx > blk.ulx) || (dbi.uly > blk.uly) || (dbi.ulx + dbi.w < blk.ulx + blk.w) || (dbi.uly + dbi.h < blk.uly + blk.h))
			{
				int k, k0, k1, k2, mink, i;
				int w = blk.w; //width of output block
				int h = blk.h; //height of ouput block
				
				//Reference to output block data array
				outdata[c] = (int[]) blk.Data;
				
				//Create data array of blk if necessary
				if (outdata[c] == null || outdata[c].Length != h * w)
				{
					outdata[c] = new int[h * w];
					blk.Data = outdata[c];
				}
				
				outdata[(c + 1) % 3] = new int[outdata[c].Length];
				outdata[(c + 2) % 3] = new int[outdata[c].Length];
				
				if (block0 == null || block0.DataType != DataBlk.TYPE_INT)
					block0 = new DataBlkInt();
				if (block1 == null || block1.DataType != DataBlk.TYPE_INT)
					block1 = new DataBlkInt();
				if (block2 == null || block2.DataType != DataBlk.TYPE_INT)
					block2 = new DataBlkInt();
				block0.w = block1.w = block2.w = blk.w;
				block0.h = block1.h = block2.h = blk.h;
				block0.ulx = block1.ulx = block2.ulx = blk.ulx;
				block0.uly = block1.uly = block2.uly = blk.uly;
				
				int[] data0, data1, data2; // input data arrays
				
				// Fill in buffer blocks (to be read only)
				// Returned blocks may have different size and position
				block0 = (DataBlkInt) src.getInternCompData(block0, 0);
				data0 = (int[]) block0.Data;
				block1 = (DataBlkInt) src.getInternCompData(block1, 1);
				data1 = (int[]) block1.Data;
				block2 = (DataBlkInt) src.getInternCompData(block2, 2);
				data2 = (int[]) block2.Data;
				
				// Set the progressiveness of the output data
				blk.progressive = block0.progressive || block1.progressive || block2.progressive;
				blk.offset = 0;
				blk.scanw = w;
				
				// set attributes of the DataBlk used for buffering
				dbi.progressive = blk.progressive;
				dbi.ulx = blk.ulx;
				dbi.uly = blk.uly;
				dbi.w = blk.w;
				dbi.h = blk.h;
				
				// Perform conversion
				
				// Initialize general indexes
				k = w * h - 1;
				k0 = block0.offset + (h - 1) * block0.scanw + w - 1;
				k1 = block1.offset + (h - 1) * block1.scanw + w - 1;
				k2 = block2.offset + (h - 1) * block2.scanw + w - 1;
				
				for (i = h - 1; i >= 0; i--)
				{
					for (mink = k - w; k > mink; k--, k0--, k1--, k2--)
					{
						outdata[1][k] = (data0[k0] - ((data1[k1] + data2[k2]) >> 2));
						outdata[0][k] = data2[k2] + outdata[1][k];
						outdata[2][k] = data1[k1] + outdata[1][k];
					}
					// Jump to beggining of previous line in input
					k0 -= (block0.scanw - w);
					k1 -= (block1.scanw - w);
					k2 -= (block2.scanw - w);
				}
				outdata[c] = null;
			}
			else if ((c >= 0) && (c < 3))
			{
				//Asking for the 2nd or 3rd block component
				blk.Data = outdata[c];
				blk.progressive = dbi.progressive;
				blk.offset = (blk.uly - dbi.uly) * dbi.w + blk.ulx - dbi.ulx;
				blk.scanw = dbi.w;
				outdata[c] = null;
			}
			else
			{
				// Requesting a non valid component index
				throw new System.ArgumentException();
			}
			return blk;
		}
		
		/// <summary> Apply inverse irreversible component transformation to obtain requested
		/// component from specified block of data. Whatever the type of requested
		/// DataBlk, it always returns a DataBlkFloat.
		/// 
		/// </summary>
		/// <param name="blk">Determine the rectangular area to return 
		/// 
		/// </param>
		/// <param name="c">The index of the requested component
		/// 
		/// </param>
		/// <returns> Data of requested component
		/// 
		/// </returns>
		private DataBlk invICT(DataBlk blk, int c)
		{
			if (c >= 3 && c < NumComps)
			{
				// Requesting a component whose index is greater than 3            
                int k, k0, mink, i; //  k1, k2 removed
				int w = blk.w; //width of output block
				int h = blk.h; //height of ouput block
				
				int[] out_data; // array of output data
				
				//Reference to output block data array
				out_data = (int[]) blk.Data;
				
				//Create data array of blk if necessary
				if (out_data == null)
				{
					out_data = new int[h * w];
					blk.Data = out_data;
				}
				
				// Variables
				DataBlkFloat indb = new DataBlkFloat(blk.ulx, blk.uly, w, h);
				float[] indata; // input data array
				
				// Get the input data
				// (returned block may be larger than requested one)
				src.getInternCompData(indb, c);
				indata = (float[]) indb.Data;
				
				// Copy the data converting from int to int
				k = w * h - 1;
				k0 = indb.offset + (h - 1) * indb.scanw + w - 1;
				for (i = h - 1; i >= 0; i--)
				{
					for (mink = k - w; k > mink; k--, k0--)
					{
						//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
						out_data[k] = (int) (indata[k0]);
					}
					// Jump to beggining of previous line in input
					k0 -= (indb.scanw - w);
				}
				
				// Set the progressivity and offset
				blk.progressive = indb.progressive;
				blk.offset = 0;
				blk.scanw = w;
			}
			// If asking a component for the first time for this block,
			// do transform for the 3 components
			else if ((outdata[c] == null) || (dbi.ulx > blk.ulx) || (dbi.uly > blk.uly) || (dbi.ulx + dbi.w < blk.ulx + blk.w) || (dbi.uly + dbi.h < blk.uly + blk.h))
			{
				int k, k0, k1, k2, mink, i;
				int w = blk.w; //width of output block
				int h = blk.h; //height of ouput block
				
				//Reference to output block data array
				outdata[c] = (int[]) blk.Data;
				
				//Create data array of blk if necessary
				if (outdata[c] == null || outdata[c].Length != w * h)
				{
					outdata[c] = new int[h * w];
					blk.Data = outdata[c];
				}
				
				outdata[(c + 1) % 3] = new int[outdata[c].Length];
				outdata[(c + 2) % 3] = new int[outdata[c].Length];
				
				if (block0 == null || block0.DataType != DataBlk.TYPE_FLOAT)
					block0 = new DataBlkFloat();
				if (block2 == null || block2.DataType != DataBlk.TYPE_FLOAT)
					block2 = new DataBlkFloat();
				if (block1 == null || block1.DataType != DataBlk.TYPE_FLOAT)
					block1 = new DataBlkFloat();
				block0.w = block2.w = block1.w = blk.w;
				block0.h = block2.h = block1.h = blk.h;
				block0.ulx = block2.ulx = block1.ulx = blk.ulx;
				block0.uly = block2.uly = block1.uly = blk.uly;
				
				float[] data0, data1, data2; // input data arrays
				
				// Fill in buffer blocks (to be read only)
				// Returned blocks may have different size and position
				block0 = (DataBlkFloat) src.getInternCompData(block0, 0);
				data0 = (float[]) block0.Data;
				block2 = (DataBlkFloat) src.getInternCompData(block2, 1);
				data2 = (float[]) block2.Data;
				block1 = (DataBlkFloat) src.getInternCompData(block1, 2);
				data1 = (float[]) block1.Data;
				
				// Set the progressiveness of the output data
				blk.progressive = block0.progressive || block1.progressive || block2.progressive;
				blk.offset = 0;
				blk.scanw = w;
				
				// set attributes of the DataBlk used for buffering
				dbi.progressive = blk.progressive;
				dbi.ulx = blk.ulx;
				dbi.uly = blk.uly;
				dbi.w = blk.w;
				dbi.h = blk.h;
				
				//Perform conversion
				
				// Initialize general indexes
				k = w * h - 1;
				k0 = block0.offset + (h - 1) * block0.scanw + w - 1;
				k2 = block2.offset + (h - 1) * block2.scanw + w - 1;
				k1 = block1.offset + (h - 1) * block1.scanw + w - 1;
				
				for (i = h - 1; i >= 0; i--)
				{
					for (mink = k - w; k > mink; k--, k0--, k2--, k1--)
					{
						//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
						outdata[0][k] = (int) (data0[k0] + 1.402f * data1[k1] + 0.5f);
						//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
						outdata[1][k] = (int) (data0[k0] - 0.34413f * data2[k2] - 0.71414f * data1[k1] + 0.5f);
						//UPGRADE_WARNING: Data types in Visual C# might be different.  Verify the accuracy of narrowing conversions. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1042'"
						outdata[2][k] = (int) (data0[k0] + 1.772f * data2[k2] + 0.5f);
					}
					// Jump to beggining of previous line in input
					k0 -= (block0.scanw - w);
					k2 -= (block2.scanw - w);
					k1 -= (block1.scanw - w);
				}
				outdata[c] = null;
			}
			else if ((c >= 0) && (c <= 3))
			{
				//Asking for the 2nd or 3rd block component
				blk.Data = outdata[c];
				blk.progressive = dbi.progressive;
				blk.offset = (blk.uly - dbi.uly) * dbi.w + blk.ulx - dbi.ulx;
				blk.scanw = dbi.w;
				outdata[c] = null;
			}
			else
			{
				// Requesting a non valid component index
				throw new System.ArgumentException();
			}
			return blk;
		}
		
		/// <summary> Changes the current tile, given the new indexes. An
		/// IllegalArgumentException is thrown if the indexes do not
		/// correspond to a valid tile.
		/// 
		/// <P>This default implementation changes the tile in the source
		/// and re-initializes properly component transformation variables..
		/// 
		/// </summary>
		/// <param name="x">The horizontal index of the tile.
		/// 
		/// </param>
		/// <param name="y">The vertical index of the new tile.
		/// 
		/// 
		/// </param>
		public override void  setTile(int x, int y)
		{
			src.setTile(x, y);
			tIdx = TileIdx; // index of the current tile
			
			// initializations
			if (((System.Int32) cts.getTileDef(tIdx)) == NONE)
				transfType = NONE;
			else
			{
				int nc = src.NumComps > 3?3:src.NumComps;
				int rev = 0;
				for (int c = 0; c < nc; c++)
				{
					rev += (wfs.isReversible(tIdx, c)?1:0);
				}
				if (rev == 3)
				{
					// All WT are reversible
					transfType = INV_RCT;
				}
				else if (rev == 0)
				{
					// All WT irreversible
					transfType = INV_ICT;
				}
				else
				{
					// Error
					throw new System.ArgumentException("Wavelet transformation and " + "component transformation" + " not coherent in tile" + tIdx);
				}
			}
		}
		
		/// <summary> 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).
		/// 
		/// <P>This default implementation just advances to the next tile
		/// in the source and re-initializes properly component
		/// transformation variables.
		/// 
		/// 
		/// </summary>
		public override void  nextTile()
		{
			src.nextTile();
			tIdx = TileIdx; // index of the current tile
			
			// initializations
			if (((System.Int32) cts.getTileDef(tIdx)) == NONE)
				transfType = NONE;
			else
			{
				int nc = src.NumComps > 3?3:src.NumComps;
				int rev = 0;
				for (int c = 0; c < nc; c++)
				{
					rev += (wfs.isReversible(tIdx, c)?1:0);
				}
				if (rev == 3)
				{
					// All WT are reversible
					transfType = INV_RCT;
				}
				else if (rev == 0)
				{
					// All WT irreversible
					transfType = INV_ICT;
				}
				else
				{
					// Error
					throw new System.ArgumentException("Wavelet transformation and " + "component transformation" + " not coherent in tile" + tIdx);
				}
			}
		}
	}
}