libremetaverse/CSJ2K/j2k/image/input/ImgReaderPGX.cs

/*
* CVS identifier:
*
* $Id: ImgReaderPGX.java,v 1.13 2002/07/25 15:08:13 grosbois Exp $
*
* Class:                   ImgReaderPGX
*
* Description:             Image Reader for PGX files (custom file format
*                          for VM3A)
*
*
*
* 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.io;
using CSJ2K.j2k;
namespace CSJ2K.j2k.image.input
{
	
	/// <summary> This class extends the ImgReader abstract class for reading PGX files. PGX
	/// is a custom monochrome file format invented specifically to simplify the
	/// use of JPEG 2000 with images of different bit-depths in the range 1 to 31
	/// bits per pixel.
	/// 
	/// <p>The file consists of a one line text header followed by the data.</p>
	/// 
	/// <p>
	/// <u>Header:</u> "PG"+ <i>ws</i> +&lt;<i>endianess</i>&gt;+ <i>ws</i>
	/// +[<i>sign</i>]+<i>ws</i> + &lt;<i>bit-depth</i>&gt;+"
	/// "+&lt;<i>width</i>&gt;+" "+&lt;<i>height</i>&gt;+'\n'</p> 
	/// 
	/// <p>where:<br>
	/// <ul>
	/// <li><i>ws</i> (white-spaces) is any combination of characters ' ' and
	/// '\t'.</li> 
	/// <li><i>endianess</i> equals "LM" or "ML"(resp. little-endian or
	/// big-endian)</li> 
	/// <li><i>sign</i> equals "+" or "-" (resp. unsigned or signed). If omited,
	/// values are supposed to be unsigned.</li> 
	/// <li><i>bit-depth</i> that can be any number between 1 and 31.</li>
	/// <li><i>width</i> and <i>height</i> are the image dimensions (in
	/// pixels).</li> 
	/// </ul>
	/// 
	/// <u>Data:</u> The image binary values appear one after the other (in raster
	/// order) immediately after the last header character ('\n') and are
	/// byte-aligned (they are packed into 1,2 or 4 bytes per sample, depending
	/// upon the bit-depth value).
	/// </p>
	/// 
	/// <p> If the data is unisigned, level shifting is applied subtracting
	/// 2^(bitdepth - 1)</p>
	/// 
	/// <p>Since it is not possible to know the input file byte-ordering before
	/// reading its header, this class can not be construct from a
	/// RandomAccessIO. So, the constructor has to open first the input file, to
	/// read only its header, and then it can create the appropriate
	/// BufferedRandomAccessFile (Big-Endian or Little-Endian byte-ordering).</p>
	/// 
	/// <p>NOTE: This class is not thread safe, for reasons of internal
	/// buffering.</p>
	/// 
	/// </summary>
	/// <seealso cref="jj2000.j2k.image.ImgData">
	/// </seealso>
	/// <seealso cref="RandomAccessIO">
	/// </seealso>
	/// <seealso cref="BufferedRandomAccessFile">
	/// </seealso>
	/// <seealso cref="BEBufferedRandomAccessFile">
	/// 
	/// </seealso>
	public class ImgReaderPGX:ImgReader, EndianType
	{
		
		/// <summary>The offset of the raw pixel data in the PGX file </summary>
		private int offset;
		
		/// <summary>The RandomAccessIO where to get datas from </summary>
		//UPGRADE_TODO: Class 'java.io.RandomAccessFile' was converted to 'System.IO.FileStream' which has a different behavior. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1073_javaioRandomAccessFile'"
		private System.IO.FileStream in_Renamed;
		
		/// <summary>The bit-depth of the input file (must be between 1 and 31)</summary>
		private int bitDepth;
		
		/// <summary>Whether the input datas are signed or not </summary>
		private bool isSigned;
		
		
		/// <summary>The pack length of one sample (in bytes, according to the output
		/// bit-depth 
		/// </summary>
		private int packBytes;
		
		/// <summary>The byte ordering to use, as defined in EndianType </summary>
		private int byteOrder;
		
		/// <summary>The line buffer. </summary>
		// This makes the class not thrad safe
		// (but it is not the only one making it so)
		private byte[] buf;
		
		/// <summary>Temporary DataBlkInt object (needed when encoder uses floating-point
		/// filters). This avoid allocating new DataBlk at each time 
		/// </summary>
		private DataBlkInt intBlk;
		
		/// <summary> Creates a new PGX file reader from the specified File object.
		/// 
		/// </summary>
		/// <param name="in">The input file as File object.
		/// 
		/// </param>
		/// <exception cref="IOException">If an I/O error occurs.
		/// 
		/// </exception>
		public ImgReaderPGX(System.IO.FileInfo in_Renamed)
		{
			System.String header;
			
			// Check if specified file exists
			bool tmpBool;
			if (System.IO.File.Exists(in_Renamed.FullName))
				tmpBool = true;
			else
				tmpBool = System.IO.Directory.Exists(in_Renamed.FullName);
			if (!tmpBool)
			{
				throw new System.ArgumentException("PGX file " + in_Renamed.Name + " does not exist");
			}
			
			//Opens the given file
			this.in_Renamed = SupportClass.RandomAccessFileSupport.CreateRandomAccessFile(in_Renamed, "r");
			try
			{
                System.IO.StreamReader in_reader = new System.IO.StreamReader(this.in_Renamed);
				//UPGRADE_ISSUE: Method 'java.io.RandomAccessFile.readLine' was not converted. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1000_javaioRandomAccessFilereadLine'"
				header = in_reader.ReadLine();
			}
			catch (System.IO.IOException)
			{
				throw new System.IO.IOException(in_Renamed.Name + " is not a PGX file");
			}
			if (header == null)
			{
				throw new System.IO.IOException(in_Renamed.Name + " is an empty file");
			}
			offset = (header.Length + 1);
			
			//Get informations from header
			SupportClass.Tokenizer st = new SupportClass.Tokenizer(header);
			try
			{
				int nTokens = st.Count;
				
				// Magic Number
				if (!(st.NextToken()).Equals("PG"))
					throw new System.IO.IOException(in_Renamed.Name + " is not a PGX file");
				
				// Endianess
				System.String tmp = st.NextToken();
				if (tmp.Equals("LM"))
					byteOrder = CSJ2K.j2k.io.EndianType_Fields.LITTLE_ENDIAN;
				else if (tmp.Equals("ML"))
					byteOrder = CSJ2K.j2k.io.EndianType_Fields.BIG_ENDIAN;
				else
					throw new System.IO.IOException(in_Renamed.Name + " is not a PGX file");
				
				// Unsigned/signed if present in the header
				if (nTokens == 6)
				{
					tmp = st.NextToken();
					if (tmp.Equals("+"))
						isSigned = false;
					else if (tmp.Equals("-"))
						isSigned = true;
					else
						throw new System.IO.IOException(in_Renamed.Name + " is not a PGX file");
				}
				
				// bit-depth, width, height
				try
				{
					bitDepth = (System.Int32.Parse(st.NextToken()));
					// bitDepth must be between 1 and 31
					if ((bitDepth <= 0) || (bitDepth > 31))
						throw new System.IO.IOException(in_Renamed.Name + " is not a valid PGX file");
					
					w = (System.Int32.Parse(st.NextToken()));
					h = (System.Int32.Parse(st.NextToken()));
				}
				catch (System.FormatException)
				{
					throw new System.IO.IOException(in_Renamed.Name + " is not a PGX file");
				}
			}
			catch (System.ArgumentOutOfRangeException)
			{
				throw new System.IO.IOException(in_Renamed.Name + " is not a PGX file");
			}
			
			// Number of component
			nc = 1;
			
			// Number of bytes per data
			if (bitDepth <= 8)
				packBytes = 1;
			else if (bitDepth <= 16)
				packBytes = 2;
			// <= 31
			else
				packBytes = 4;
		}
		
		/// <summary> Creates a new PGX file reader from the specified file name.
		/// 
		/// </summary>
		/// <param name="inName">The input file name.
		/// 
		/// </param>
		public ImgReaderPGX(System.String inName):this(new System.IO.FileInfo(inName))
		{
		}
		
		/// <summary> Closes the underlying RandomAccessIO from where the image data is being
		/// read. No operations are possible after a call to this method.
		/// 
		/// </summary>
		/// <exception cref="IOException">If an I/O error occurs.
		/// 
		/// </exception>
		public override void  close()
		{
			in_Renamed.Close();
			in_Renamed = null;
			buf = null;
		}
		
		/// <summary> Returns the number of bits corresponding to the nominal range of the
		/// data in the specified component. This is the value of bitDepth which is
		/// read in the PGX file header.
		/// 
		/// <P>If this number is <i>b</b> then the nominal range is between
		/// -2^(b-1) and 2^(b-1)-1, for originally signed or unsigned data
		/// (unsigned data is level shifted to have a nominal average of 0).
		/// 
		/// </summary>
		/// <param name="c">The index of the component.
		/// 
		/// </param>
		/// <returns> The number of bits corresponding to the nominal range of the
		/// data.
		/// 
		/// </returns>
		public override int getNomRangeBits(int c)
		{
			// Check component index
			if (c != 0)
				throw new System.ArgumentException();
			
			return bitDepth;
		}
		
		/// <summary> Returns the position of the fixed point in the specified component
		/// (i.e. the number of fractional bits), which is always 0 for this
		/// ImgReader.
		/// 
		/// </summary>
		/// <param name="c">The index of the component.
		/// 
		/// </param>
		/// <returns> The position of the fixed-point (i.e. the number of fractional
		/// bits). Always 0 for this ImgReader.
		/// 
		/// </returns>
		public override int getFixedPoint(int c)
		{
			// Check component index
			if (c != 0)
				throw new System.ArgumentException();
			return 0;
		}
		
		/// <summary> Returns, in the blk argument, the block of image data containing the
		/// specifed rectangular area, in the specified component. The data is
		/// returned, as a reference to the internal data, if any, instead of as a
		/// copy, therefore the returned data should not be modified.
		/// 
		/// <p>After being read the coefficients are level shifted by subtracting
		/// 2^(nominal bit range - 1)<p>
		/// 
		/// <p>The rectangular area to return is specified by the 'ulx', 'uly', 'w'
		/// and 'h' members of the 'blk' argument, relative to the current
		/// tile. These members are not modified by this method. The 'offset' and
		/// 'scanw' of the returned data can be arbitrary. See the 'DataBlk'
		/// class.</p>
		/// 
		/// <p>If the data array in <tt>blk</tt> is <tt>null</tt>, then a new one
		/// is created if necessary. The implementation of this interface may
		/// choose to return the same array or a new one, depending on what is more
		/// efficient. Therefore, the data array in <tt>blk</tt> prior to the
		/// method call should not be considered to contain the returned data, a
		/// new array may have been created. Instead, get the array from
		/// <tt>blk</tt> after the method has returned.</p>
		/// 
		/// <p>The returned data always has its 'progressive' attribute unset
		/// (i.e. false).</p>
		/// 
		/// <p>When an I/O exception is encountered the JJ2KExceptionHandler is
		/// used. The exception is passed to its handleException method. The action
		/// that is taken depends on the action that has been registered in
		/// JJ2KExceptionHandler. See JJ2KExceptionHandler for details.</p>
		/// 
		/// </summary>
		/// <param name="blk">Its coordinates and dimensions specify the area to
		/// return. Some fields in this object are modified to return the data.
		/// 
		/// </param>
		/// <param name="c">The index of the component from which to get the data. Only 0
		/// is valid.
		/// 
		/// </param>
		/// <returns> The requested DataBlk
		/// 
		/// </returns>
		/// <seealso cref="getCompData">
		/// </seealso>
		/// <seealso cref="JJ2KExceptionHandler">
		/// 
		/// </seealso>
		public override DataBlk getInternCompData(DataBlk blk, int c)
		{
			int k, j, i, mi; // counters
			int levShift = 1 << (bitDepth - 1);
			
			// Check component index
			if (c != 0)
				throw new System.ArgumentException();
			
			// Check type of block provided as an argument
			if (blk.DataType != DataBlk.TYPE_INT)
			{
				if (intBlk == null)
					intBlk = new DataBlkInt(blk.ulx, blk.uly, blk.w, blk.h);
				else
				{
					intBlk.ulx = blk.ulx;
					intBlk.uly = blk.uly;
					intBlk.w = blk.w;
					intBlk.h = blk.h;
				}
				blk = intBlk;
			}
			
			// Get data array
			int[] barr = (int[]) blk.Data;
			if (barr == null || barr.Length < blk.w * blk.h * packBytes)
			{
				barr = new int[blk.w * blk.h];
				blk.Data = barr;
			}
			
			int paddingLength = (32 - bitDepth);
			if (buf == null || buf.Length < packBytes * blk.w)
			{
				buf = new byte[packBytes * blk.w];
			}
			try
			{
				switch (packBytes)
				{
					
					// Switch between one of the 3 byte packet type
					case 1:  // Samples packed into 1 byte
						// Read line by line
						mi = blk.uly + blk.h;
						if (isSigned)
						{
							for (i = blk.uly; i < mi; i++)
							{
								// Reposition in input
								in_Renamed.Seek(offset + i * w + blk.ulx, System.IO.SeekOrigin.Begin);
								in_Renamed.Read(buf, 0, blk.w);
								for (k = (i - blk.uly) * blk.w + blk.w - 1, j = blk.w - 1; j >= 0; k--)
									barr[k] = (((buf[j--] & 0xFF) << paddingLength) >> paddingLength);
							}
						}
						else
						{
							// Not signed
							for (i = blk.uly; i < mi; i++)
							{
								// Reposition in input
								in_Renamed.Seek(offset + i * w + blk.ulx, System.IO.SeekOrigin.Begin);
								in_Renamed.Read(buf, 0, blk.w);
								for (k = (i - blk.uly) * blk.w + blk.w - 1, j = blk.w - 1; j >= 0; k--)
									barr[k] = (SupportClass.URShift(((buf[j--] & 0xFF) << paddingLength), paddingLength)) - levShift;
							}
						}
						break;
					
					
					case 2:  // Samples packed into 2 bytes
						// Read line by line
						mi = blk.uly + blk.h;
						if (isSigned)
						{
							for (i = blk.uly; i < mi; i++)
							{
								// Reposition in input
								in_Renamed.Seek(offset + 2 * (i * w + blk.ulx), System.IO.SeekOrigin.Begin);
								in_Renamed.Read(buf, 0, blk.w << 1);
								switch (byteOrder)
								{
									
									case CSJ2K.j2k.io.EndianType_Fields.LITTLE_ENDIAN: 
										for (k = (i - blk.uly) * blk.w + blk.w - 1, j = (blk.w << 1) - 1; j >= 0; k--)
										{
											barr[k] = ((((buf[j--] & 0xFF) << 8) | (buf[j--] & 0xFF)) << paddingLength) >> paddingLength;
										}
										break;
									
									case CSJ2K.j2k.io.EndianType_Fields.BIG_ENDIAN: 
										for (k = (i - blk.uly) * blk.w + blk.w - 1, j = (blk.w << 1) - 1; j >= 0; k--)
										{
											barr[k] = (((buf[j--] & 0xFF) | ((buf[j--] & 0xFF) << 8)) << paddingLength) >> paddingLength;
										}
										break;
									
									default: 
										throw new System.ApplicationException("Internal JJ2000 bug");
									
								}
							}
						}
						else
						{
							// If not signed
							for (i = blk.uly; i < mi; i++)
							{
								// Reposition in input
								in_Renamed.Seek(offset + 2 * (i * w + blk.ulx), System.IO.SeekOrigin.Begin);
								in_Renamed.Read(buf, 0, blk.w << 1);
								switch (byteOrder)
								{
									
									case CSJ2K.j2k.io.EndianType_Fields.LITTLE_ENDIAN: 
										for (k = (i - blk.uly) * blk.w + blk.w - 1, j = (blk.w << 1) - 1; j >= 0; k--)
										{
											barr[k] = (SupportClass.URShift(((((buf[j--] & 0xFF) << 8) | (buf[j--] & 0xFF)) << paddingLength), paddingLength)) - levShift;
										}
										break;
									
									case CSJ2K.j2k.io.EndianType_Fields.BIG_ENDIAN: 
										for (k = (i - blk.uly) * blk.w + blk.w - 1, j = (blk.w << 1) - 1; j >= 0; k--)
										{
											barr[k] = (SupportClass.URShift((((buf[j--] & 0xFF) | ((buf[j--] & 0xFF) << 8)) << paddingLength), paddingLength)) - levShift;
										}
										break;
									
									default: 
										throw new System.ApplicationException("Internal JJ2000 bug");
									
								}
							}
						}
						break;
					
					
					case 4:  // Samples packed into 4 bytes
						// Read line by line
						mi = blk.uly + blk.h;
						if (isSigned)
						{
							for (i = blk.uly; i < mi; i++)
							{
								// Reposition in input
								in_Renamed.Seek(offset + 4 * (i * w + blk.ulx), System.IO.SeekOrigin.Begin);
								in_Renamed.Read(buf, 0, blk.w << 2);
								switch (byteOrder)
								{
									
									case CSJ2K.j2k.io.EndianType_Fields.LITTLE_ENDIAN: 
										for (k = (i - blk.uly) * blk.w + blk.w - 1, j = (blk.w << 2) - 1; j >= 0; k--)
										{
											barr[k] = ((((buf[j--] & 0xFF) << 24) | ((buf[j--] & 0xFF) << 16) | ((buf[j--] & 0xFF) << 8) | (buf[j--] & 0xFF)) << paddingLength) >> paddingLength;
										}
										break;
									
									case CSJ2K.j2k.io.EndianType_Fields.BIG_ENDIAN: 
										for (k = (i - blk.uly) * blk.w + blk.w - 1, j = (blk.w << 2) - 1; j >= 0; k--)
										{
											barr[k] = (((buf[j--] & 0xFF) | ((buf[j--] & 0xFF) << 8) | ((buf[j--] & 0xFF) << 16) | ((buf[j--] & 0xFF) << 24)) << paddingLength) >> paddingLength;
										}
										break;
									
									default: 
										throw new System.ApplicationException("Internal JJ2000 bug");
									
								}
							}
						}
						else
						{
							for (i = blk.uly; i < mi; i++)
							{
								// Reposition in input
								in_Renamed.Seek(offset + 4 * (i * w + blk.ulx), System.IO.SeekOrigin.Begin);
								in_Renamed.Read(buf, 0, blk.w << 2);
								switch (byteOrder)
								{
									
									case CSJ2K.j2k.io.EndianType_Fields.LITTLE_ENDIAN: 
										for (k = (i - blk.uly) * blk.w + blk.w - 1, j = (blk.w << 2) - 1; j >= 0; k--)
										{
											barr[k] = (SupportClass.URShift(((((buf[j--] & 0xFF) << 24) | ((buf[j--] & 0xFF) << 16) | ((buf[j--] & 0xFF) << 8) | (buf[j--] & 0xFF)) << paddingLength), paddingLength)) - levShift;
										}
										break;
									
									case CSJ2K.j2k.io.EndianType_Fields.BIG_ENDIAN: 
										for (k = (i - blk.uly) * blk.w + blk.w - 1, j = (blk.w << 2) - 1; j >= 0; k--)
										{
											barr[k] = (SupportClass.URShift((((buf[j--] & 0xFF) | ((buf[j--] & 0xFF) << 8) | ((buf[j--] & 0xFF) << 16) | ((buf[j--] & 0xFF) << 24)) << paddingLength), paddingLength)) - levShift;
										}
										break;
									
									default: 
										throw new System.ApplicationException("Internal JJ2000 bug");
									
								}
							}
						}
						break;
					
					
					default: 
						throw new System.IO.IOException("PGX supports only bit-depth between" + " 1 and 31");
					
				}
			}
			catch (System.IO.IOException e)
			{
				JJ2KExceptionHandler.handleException(e);
			}
			
			// Turn off the progressive attribute
			blk.progressive = false;
			// Set buffer attributes
			blk.offset = 0;
			blk.scanw = blk.w;
			return blk;
		}
		
		/// <summary> Returns, in the blk argument, a block of image data containing the
		/// specifed rectangular area, in the specified component. The data is
		/// returned, as a copy of the internal data, therefore the returned data
		/// can be modified "in place".
		/// 
		/// <p>After being read the coefficients are level shifted by subtracting
		/// 2^(nominal bit range - 1)
		/// 
		/// <p>The rectangular area to return is specified by the 'ulx', 'uly', 'w'
		/// and 'h' members of the 'blk' argument, relative to the current
		/// tile. These members are not modified by this method. The 'offset' of
		/// the returned data is 0, and the 'scanw' is the same as the block's
		/// width. See the 'DataBlk' class.</p>
		/// 
		/// <p>If the data array in 'blk' is 'null', then a new one is created. If
		/// the data array is not 'null' then it is reused, and it must be large
		/// enough to contain the block's data. Otherwise an 'ArrayStoreException'
		/// or an 'IndexOutOfBoundsException' is thrown by the Java system.</p>
		/// 
		/// <p>The returned data has its 'progressive' attribute unset
		/// (i.e. false).</p>
		/// 
		/// <p>This method just calls 'getInternCompData(blk,c)'.</p>
		/// 
		/// <P>When an I/O exception is encountered the JJ2KExceptionHandler is
		/// used. The exception is passed to its handleException method. The action
		/// that is taken depends on the action that has been registered in
		/// JJ2KExceptionHandler. See JJ2KExceptionHandler for details.
		/// 
		/// </summary>
		/// <param name="blk">Its coordinates and dimensions specify the area to
		/// return. If it contains a non-null data array, then it must have the
		/// correct dimensions. If it contains a null data array a new one is
		/// created. The fields in this object are modified to return the data.
		/// 
		/// </param>
		/// <param name="c">The index of the component from which to get the data. Only 0
		/// is valid.
		/// 
		/// </param>
		/// <returns> The requested DataBlk
		/// 
		/// </returns>
		/// <seealso cref="getInternCompData">
		/// </seealso>
		/// <seealso cref="JJ2KExceptionHandler">
		/// 
		/// </seealso>
		public override DataBlk getCompData(DataBlk blk, int c)
		{
			return getInternCompData(blk, c);
		}
		
		/// <summary> Returns true if the data read was originally signed in the specified
		/// component, false if not.
		/// 
		/// </summary>
		/// <param name="c">The index of the component, from 0 to N-1.
		/// 
		/// </param>
		/// <returns> true if the data was originally signed, false if not.
		/// 
		/// </returns>
		public override bool isOrigSigned(int c)
		{
			// Check component index
			if (c != 0)
				throw new System.ArgumentException();
			return isSigned;
		}
		
		/// <summary> Returns a string of information about the object, more than 1 line
		/// long. The information string includes information from the underlying
		/// RandomAccessIO (its toString() method is called in turn).
		/// 
		/// </summary>
		/// <returns> A string of information about the object.
		/// 
		/// </returns>
		public override System.String ToString()
		{
			//UPGRADE_TODO: The equivalent in .NET for method 'java.lang.Object.toString' may return a different value. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1043'"
			return "ImgReaderPGX: WxH = " + w + "x" + h + ", Component = 0" + ", Bit-depth = " + bitDepth + ", signed = " + isSigned + "\nUnderlying RandomAccessIO:\n" + in_Renamed.ToString();
		}
	}
}