Package com.itextpdf.text.pdf.codec

Class CCITTG4Encoder

java.lang.Object

com.itextpdf.text.pdf.codec.CCITTG4Encoder

public class CCITTG4Encoder
extends Object

Encodes data in the CCITT G4 FAX format.

Field Summary

Fields

Modifier and Type	Field	Description
private int	bit
private static final int	CODE
private int	data
private byte[]	dataBp
private static final int	EOL
private static final int	G3CODE_EOF
private static final int	G3CODE_EOL
private static final int	G3CODE_INCOMP
private static final int	G3CODE_INVALID
private int[]	horizcode
private static final int	LENGTH
private int[]	msbmask
private int	offsetData
private static byte[]	oneruns
private ByteBuffer	outBuf
private int[]	passcode
private byte[]	refline
private int	rowbytes
private int	rowpixels
private static final int	RUNLEN
private int	sizeData
private int[][]	TIFFFaxBlackCodes
private int[][]	TIFFFaxWhiteCodes
private int[][]	vcodes
private static byte[]	zeroruns

Constructor Summary

Constructors

Constructor	Description
CCITTG4Encoder(int width)	Creates a new encoder.

Method Summary

Modifier and Type	Method	Description
byte[]	close()	Closes the encoder and returns the encoded data.
static byte[]	compress(byte[] data, int width, int height)	Encodes a full image.
private void	Fax3Encode2DRow()
void	fax4Encode(byte[] data, int height)	Encodes a number of lines.
void	fax4Encode(byte[] data, int offset, int size)	Encodes a number of lines.
private void	Fax4PostEncode()
private static int	find0span(byte[] bp, int offset, int bs, int be)
private static int	find1span(byte[] bp, int offset, int bs, int be)
private static int	finddiff(byte[] bp, int offset, int bs, int be, int color)
private static int	finddiff2(byte[] bp, int offset, int bs, int be, int color)
private int	pixel(byte[] data, int offset, int bit)
private void	putBits(int bits, int length)
private void	putcode(int[] table)
private void	putspan(int span, int[][] tab)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Details

rowbytes

private int rowbytes

rowpixels

private int rowpixels

bit

private int bit

data

private int data

refline

private byte[] refline

outBuf

private ByteBuffer outBuf

dataBp

private byte[] dataBp

offsetData

private int offsetData

sizeData

private int sizeData

zeroruns

private static byte[] zeroruns

oneruns

private static byte[] oneruns

LENGTH

private static final int LENGTH

See Also:

• Constant Field Values

CODE

private static final int CODE

See Also:

• Constant Field Values

RUNLEN

private static final int RUNLEN

See Also:

• Constant Field Values

EOL

private static final int EOL

See Also:

• Constant Field Values

G3CODE_EOL

private static final int G3CODE_EOL

See Also:

• Constant Field Values

G3CODE_INVALID

private static final int G3CODE_INVALID

See Also:

• Constant Field Values

G3CODE_EOF

private static final int G3CODE_EOF

See Also:

• Constant Field Values

G3CODE_INCOMP

private static final int G3CODE_INCOMP

See Also:

• Constant Field Values

TIFFFaxWhiteCodes

private int[][] TIFFFaxWhiteCodes

TIFFFaxBlackCodes

private int[][] TIFFFaxBlackCodes

horizcode

private int[] horizcode

passcode

private int[] passcode

vcodes

private int[][] vcodes

msbmask

private int[] msbmask

Constructor Details

CCITTG4Encoder

public CCITTG4Encoder(int width)

Creates a new encoder.

Parameters:

width - the line width

Method Details

fax4Encode

public void fax4Encode(byte[] data,
 int offset,
 int size)

Encodes a number of lines.

Parameters:

data - the data to be encoded

offset - the offset into the data

size - the size of the data to be encoded

compress

public static byte[] compress(byte[] data,
 int width,
 int height)

Encodes a full image.

Parameters:

data - the data to encode

width - the image width

height - the image height

Returns:

the encoded image

fax4Encode

public void fax4Encode(byte[] data,
 int height)

Encodes a number of lines.

Parameters:

data - the data to be encoded

height - the number of lines to encode

putcode

private void putcode(int[] table)

putspan

private void putspan(int span,
 int[][] tab)

putBits

private void putBits(int bits,
 int length)

Fax3Encode2DRow

private void Fax3Encode2DRow()

Fax4PostEncode

private void Fax4PostEncode()

close

public byte[] close()

Closes the encoder and returns the encoded data.

Returns:

the encoded data

pixel

private int pixel(byte[] data,
 int offset,
 int bit)

find1span

private static int find1span(byte[] bp,
 int offset,
 int bs,
 int be)

find0span

private static int find0span(byte[] bp,
 int offset,
 int bs,
 int be)

finddiff

private static int finddiff(byte[] bp,
 int offset,
 int bs,
 int be,
 int color)

finddiff2

private static int finddiff2(byte[] bp,
 int offset,
 int bs,
 int be,
 int color)