it.geosolutions.imageioimpl.plugins.tiff
Class TIFFRLECompressor

Object
  extended by TIFFCompressor
      extended by TIFFFaxCompressor
          extended by TIFFRLECompressor
Direct Known Subclasses:
TIFFCodecLibRLECompressor

public class TIFFRLECompressor
extends TIFFFaxCompressor


Field Summary
 
Fields inherited from class TIFFFaxCompressor
bits, BLACK, byteTable, horz, horzMode, inverseFill, makeupCodes, makeupCodesBlack, makeupCodesWhite, ndex, pass, passMode, termCodes, termCodesBlack, termCodesWhite, vert, vertMode, WHITE
 
Fields inherited from class TIFFCompressor
compressionTagValue, compressionType, isCompressionLossless, metadata, stream, writer
 
Constructor Summary
TIFFRLECompressor()
           
 
Method Summary
 int encode(byte[] b, int off, int width, int height, int[] bitsPerSample, int scanlineStride)
          Encodes the supplied image data, writing to the currently set ImageOutputStream.
 int encodeRLE(byte[] data, int rowOffset, int colOffset, int rowLength, byte[] compData)
          Encode a row of data using Modified Huffman Compression also known as CCITT RLE (Run Lenth Encoding).
 
Methods inherited from class TIFFFaxCompressor
add1DBits, add2DBits, addEOFB, addEOL, encode1D, initBitBuf, nextState, setMetadata
 
Methods inherited from class TIFFCompressor
getCompressionTagValue, getCompressionType, getMetadata, getStream, getWriter, isCompressionLossless, setStream, setWriter
 
Methods inherited from class Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait
 

Constructor Detail

TIFFRLECompressor

public TIFFRLECompressor()
Method Detail

encodeRLE

public int encodeRLE(byte[] data,
                     int rowOffset,
                     int colOffset,
                     int rowLength,
                     byte[] compData)
Encode a row of data using Modified Huffman Compression also known as CCITT RLE (Run Lenth Encoding).

Parameters:
data - The row of data to compress.
rowOffset - Starting index in data.
colOffset - Bit offset within first data[rowOffset].
rowLength - Number of bits in the row.
compData - The compressed data.
Returns:
The number of bytes saved in the compressed data array.

encode

public int encode(byte[] b,
                  int off,
                  int width,
                  int height,
                  int[] bitsPerSample,
                  int scanlineStride)
           throws IOException
Description copied from class: TIFFCompressor
Encodes the supplied image data, writing to the currently set ImageOutputStream.

Specified by:
encode in class TIFFCompressor
Parameters:
b - an array of bytes containing the packed but uncompressed image data.
off - the starting offset of the data to be written in the array b.
width - the width of the rectangle of pixels to be written.
height - the height of the rectangle of pixels to be written.
bitsPerSample - an array of ints indicting the number of bits used to represent each image sample within a pixel.
scanlineStride - the number of bytes separating each row of the input data.
Returns:
the number of bytes written.
Throws:
IOException - if the supplied data cannot be encoded by this TIFFCompressor, or if any I/O error occurs during writing.


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