Class PngEncoder

java.lang.Object
  |
  +--PngEncoder

public class PngEncoder

extends java.lang.Object

Field Summary

(package private) int	bytesPerPixel
static int	chunksize
static int	compress
protected java.util.zip.CRC32	crc
protected long	crcValue
(package private) byte[]	deflatebuff
(package private) int	defpos
static boolean	ENCODE_ALPHA Constant specifying that alpha channel should be encoded.
boolean	encodeAlpha
static int	filter
static int	FILTER_LAST
static int	FILTER_NONE Constants for filters
static int	FILTER_SUB
static int	FILTER_UP
protected int	height
(package private) byte[]	lastline
(package private) byte[]	line
java.lang.String	message
static boolean	NO_ALPHA Constant specifying that alpha channel should not be encoded.
protected java.io.OutputStream	out
(package private) int[]	pixels
(package private) byte[]	raw
(package private) java.util.zip.Deflater	scrunch
javax.swing.JLabel	status
protected int	width

Constructor Summary

PngEncoder(int width, int height, java.io.OutputStream out)
Class constructor specifying Size of image, and stream to write to.

Method Summary

void	addSlice(java.awt.image.BufferedImage image, javax.swing.JLabel status, java.lang.String message) Write a slice of image data to the output stream.
void	clean()
void	finish()
void	start() Writes the current image to the output stream in PNG format, specifying whether to encode alpha or not.
protected void	writeByte(int b) Write a single byte into the output.
protected void	writeBytes(byte[] data) Write an array of bytes output stream Note: This routine has the side effect of updating the crc.
protected void	writeBytes(byte[] data, int nBytes) Write an array of bytes into the pngBytes array, specifying number of bytes to write.
protected void	writeDat(byte[] data, int size) Write an IDAT chunk.
protected void	writeEnd() Write a PNG "IEND" chunk into the pngBytes array.
protected void	writeHeader() Write a PNG "IHDR" chunk to the output.
protected void	writeInt2(int n) Write a two-byte integer into the output.
protected void	writeInt4(int n) Write a four-byte integer into the output.
protected void	writeInt4nocrc(int n) Write a four-byte integer into the output.
protected void	writeString(java.lang.String s) Write a string into the output.

Methods inherited from class java.lang.Object

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

Field Detail

ENCODE_ALPHA

public static final boolean ENCODE_ALPHA

Constant specifying that alpha channel should be encoded.

See Also:

Constant Field Values

NO_ALPHA

public static final boolean NO_ALPHA

Constant specifying that alpha channel should not be encoded.

See Also:

Constant Field Values

FILTER_NONE

public static final int FILTER_NONE

Constants for filters

See Also:

Constant Field Values

FILTER_SUB

public static final int FILTER_SUB

See Also:

Constant Field Values

FILTER_UP

public static final int FILTER_UP

See Also:

Constant Field Values

FILTER_LAST

public static final int FILTER_LAST

See Also:

Constant Field Values

compress

public static int compress

filter

public static int filter

chunksize

public static int chunksize

out

protected java.io.OutputStream out

width

protected int width

height

protected int height

crc

protected java.util.zip.CRC32 crc

crcValue

protected long crcValue

encodeAlpha

public boolean encodeAlpha

status

public javax.swing.JLabel status

message

public java.lang.String message

bytesPerPixel

int bytesPerPixel

lastline

byte[] lastline

raw

byte[] raw

line

byte[] line

pixels

int[] pixels

deflatebuff

byte[] deflatebuff

defpos

int defpos

scrunch

java.util.zip.Deflater scrunch

Constructor Detail

PngEncoder

public PngEncoder(int width,
                  int height,
                  java.io.OutputStream out)

Class constructor specifying Size of image, and stream to write to.

See Also:

Image

Method Detail

writeBytes

protected void writeBytes(byte[] data)
                   throws java.io.IOException

Write an array of bytes output stream Note: This routine has the side effect of updating the crc.

Parameters:

data - The data to be written .

java.io.IOException

writeBytes

protected void writeBytes(byte[] data,
                          int nBytes)
                   throws java.io.IOException

Write an array of bytes into the pngBytes array, specifying number of bytes to write. Note: This routine has the side effect of updating the crc.

Parameters:

data - The data to be written.

nBytes - The number of bytes to be written.

java.io.IOException

writeInt2

protected void writeInt2(int n)
                  throws java.io.IOException

Write a two-byte integer into the output.

Parameters:

n - The integer to be written.

java.io.IOException

writeInt4

protected void writeInt4(int n)
                  throws java.io.IOException

Write a four-byte integer into the output.

Parameters:

n - The integer to be written.

java.io.IOException

writeInt4nocrc

protected void writeInt4nocrc(int n)
                       throws java.io.IOException

Write a four-byte integer into the output. Do not update crc.

Parameters:

n - The integer to be written.

java.io.IOException

writeByte

protected void writeByte(int b)
                  throws java.io.IOException

Write a single byte into the output.

java.io.IOException

writeString

protected void writeString(java.lang.String s)
                    throws java.io.IOException

Write a string into the output. This uses the getBytes method, so the encoding used will be its default.

java.io.IOException

See Also:

String.getBytes()

writeHeader

protected void writeHeader()
                    throws java.io.IOException

Write a PNG "IHDR" chunk to the output.

java.io.IOException

start

public void start()
           throws java.io.IOException

Writes the current image to the output stream in PNG format, specifying whether to encode alpha or not.

Returns:

an array of bytes, or null if there was a problem

java.io.IOException

addSlice

public void addSlice(java.awt.image.BufferedImage image,
                     javax.swing.JLabel status,
                     java.lang.String message)
              throws java.io.IOException,
                     CookKillException

Write a slice of image data to the output stream. This may write one or more PNG "IDAT" chunks.

java.io.IOException

CookKillException

finish

public void finish()
            throws java.io.IOException

java.io.IOException

clean

public void clean()

writeDat

protected void writeDat(byte[] data,
                        int size)
                 throws java.io.IOException

Write an IDAT chunk.

Parameters:

data - the (compressed) data to be written.

size - The number of bytes.

java.io.IOException

writeEnd

protected void writeEnd()
                 throws java.io.IOException

Write a PNG "IEND" chunk into the pngBytes array.

java.io.IOException