C# Class CSJ2K.j2k.image.output.ImgWriterPGM

This class writes a component from an image in 8 bit unsigned data to a binary PGM file. The size of the image that is written to the file is the size of the component from which to get the data, not the size of the source image (they differ if there is some sub-sampling).

Before writing, all coefficients are inversly level shifted and then "saturated" (they are limited to the nominal dynamic range).
Ex: if the nominal range is 0-255, the following algorithm is applied:
if coeff<0, output=0 if coeff>255, output=255 else output=coeff

The write() methods of an object of this class may not be called concurrently from different threads.

NOTE: This class is not thread safe, for reasons of internal buffering.

Inheritance: CSJ2K.j2k.image.output.ImgWriter

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Public Methods

Method	Description
ImgWriterPGM ( IFileInfo out_Renamed, BlkImgDataSrc imgSrc, int c ) : System	Creates a new writer to the specified File object, to write data from the specified component. The size of the image that is written to the file is the size of the component from which to get the data, specified by b, not the size of the source image (they differ if there is some sub-sampling).
ImgWriterPGM ( System fname, BlkImgDataSrc imgSrc, int c ) : System	Creates a new writer to the specified file, to write data from the specified component. The size of the image that is written to the file is the size of the component from which to get the data, specified by b, not the size of the source image (they differ if there is some sub-sampling).
ToString ( ) : System.String	Returns a string of information about the object, more than 1 line long. The information string includes information from the underlying RandomAccessFile (its toString() method is called in turn).
close ( ) : void	Closes the underlying file or netwrok connection to where the data is written. Any call to other methods of the class become illegal after a call to this one.
flush ( ) : void	Writes all buffered data to the file or resource.
write ( ) : void	Writes the source's current tile to the output. The requests of data issued to the source BlkImgDataSrc object are done by strips, in order to reduce memory usage. If the data returned from the BlkImgDataSrc source is progressive, then it is requested over and over until it is not progressive anymore.
write ( int ulx, int uly, int w, int h ) : void	Writes the data of the specified area to the file, coordinates are relative to the current tile of the source. Before writing, the coefficients are limited to the nominal range. This method may not be called concurrently from different threads. If the data returned from the BlkImgDataSrc source is progressive, then it is requested over and over until it is not progressive anymore.

Private Methods

Method	Description
writeHeaderInfo ( ) : void	Writes the header info of the PGM file : P5 width height 255

Method Details

ImgWriterPGM() public method

Creates a new writer to the specified File object, to write data from the specified component.

The size of the image that is written to the file is the size of the component from which to get the data, specified by b, not the size of the source image (they differ if there is some sub-sampling).

public ImgWriterPGM ( IFileInfo out_Renamed, BlkImgDataSrc imgSrc, int c ) : System
out_Renamed	IFileInfo
imgSrc	BlkImgDataSrc	The source from where to get the image data to write. /// ///
c	int	The index of the component from where to get the data. /// ///
return	System

ImgWriterPGM() public method

Creates a new writer to the specified file, to write data from the specified component.

public ImgWriterPGM ( System fname, BlkImgDataSrc imgSrc, int c ) : System
fname	System	The name of the file where to write the data /// ///
imgSrc	BlkImgDataSrc	The source from where to get the image data to write. /// ///
c	int	The index of the component from where to get the data. /// ///
return	System

ToString() public method

Returns a string of information about the object, more than 1 line long. The information string includes information from the underlying RandomAccessFile (its toString() method is called in turn).

public ToString ( ) : System.String
return	System.String

close() public method

Closes the underlying file or netwrok connection to where the data is written. Any call to other methods of the class become illegal after a call to this one.

If an I/O error occurs. /// ///

public close ( ) : void
return	void

flush() public method

Writes all buffered data to the file or resource.

If an I/O error occurs. /// ///

public flush ( ) : void
return	void

write() public method

Writes the source's current tile to the output. The requests of data issued to the source BlkImgDataSrc object are done by strips, in order to reduce memory usage.

If the data returned from the BlkImgDataSrc source is progressive, then it is requested over and over until it is not progressive anymore.

If an I/O error occurs. /// ///

public write ( ) : void
return	void

write() public method

Writes the data of the specified area to the file, coordinates are relative to the current tile of the source. Before writing, the coefficients are limited to the nominal range.

This method may not be called concurrently from different threads.

If the data returned from the BlkImgDataSrc source is progressive, then it is requested over and over until it is not progressive anymore.

If an I/O error occurs. /// ///

public write ( int ulx, int uly, int w, int h ) : void
ulx	int	The horizontal coordinate of the upper-left corner of the /// area to write, relative to the current tile. /// ///
uly	int	The vertical coordinate of the upper-left corner of the area /// to write, relative to the current tile. /// ///
w	int
h	int
return	void