Class HorizontalDeDifferencingStream

java.lang.Object

java.io.InputStream

com.twelvemonkeys.imageio.plugins.psd.HorizontalDeDifferencingStream

All Implemented Interfaces:

Closeable, AutoCloseable

final class HorizontalDeDifferencingStream
extends InputStream

A decoder for data converted using "horizontal differencing predictor".

Version:

$Id: HorizontalDeDifferencingStream.java,v 1.0 11.03.13 14:20 haraldk Exp$

Field Summary

Fields

Modifier and Type	Field	Description
private final int	bitsPerSample
private final ByteBuffer	buffer
private final ReadableByteChannel	channel
private final int	columns	TODO: Create shared version with TIFF, or see if we can avoid some duplication?
private final int	samplesPerPixel

Constructor Summary

Constructors

Constructor	Description
HorizontalDeDifferencingStream(InputStream stream, int columns, int samplesPerPixel, int bitsPerSample, ByteOrder byteOrder)

Method Summary

Modifier and Type	Method	Description
void	close()
private void	decodeRow()
private boolean	fetch()
(package private) static boolean	isValidBPS(int bitsPerSample)
int	read()
int	read(byte[] b, int off, int len)
long	skip(long n)

Methods inherited from class InputStream

available, mark, markSupported, nullInputStream, read, readAllBytes, readNBytes, readNBytes, reset, skipNBytes, transferTo

Methods inherited from class Object

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

Field Details

columns

private final int columns

TODO: Create shared version with TIFF, or see if we can avoid some duplication?

samplesPerPixel

private final int samplesPerPixel

bitsPerSample

private final int bitsPerSample

channel

private final ReadableByteChannel channel

buffer

private final ByteBuffer buffer

Constructor Details

HorizontalDeDifferencingStream

public HorizontalDeDifferencingStream(InputStream stream,
 int columns,
 int samplesPerPixel,
 int bitsPerSample,
 ByteOrder byteOrder)

Method Details

isValidBPS

static boolean isValidBPS(int bitsPerSample)

fetch

private boolean fetch()
               throws IOException

Throws:

IOException

decodeRow

private void decodeRow()

read

public int read()
         throws IOException

Specified by:

read in class InputStream

Throws:

IOException

read

public int read(byte[] b,
 int off,
 int len)
         throws IOException

Overrides:

read in class InputStream

Throws:

IOException

skip

public long skip(long n)
          throws IOException

Overrides:

skip in class InputStream

Throws:

IOException

close

public void close()
           throws IOException

Specified by:

close in interface AutoCloseable

Specified by:

close in interface Closeable

Overrides:

close in class InputStream

Throws:

IOException