com.flagstone.transform.image
Class JPEGInfo

java.lang.Object
  com.flagstone.transform.image.JPEGInfo

public final class JPEGInfo
extends Object

JPEGInfo is used to extract the width and height from a JPEG encoded image.

Field Summary

static int	APP Marks the start of an application specific block.
static int	COM Marks the start of an comment block.
static int	DHT Marks the Huffman table.
static int	DQT Marks the quantization table.
static int	DRI Marks the restart interval.
static int	EOI Marks the end of an image.
static int	JPG Marks the start of a JPG block.
static int	RST Marks a restart.
static int	SOF0 Marks the start of a frame - baseline DCT.
static int	SOF2 Marks the start of a frame - progressive DCT.
static int	SOFF Marks the start of a JPG block.
static int	SOI Marks the start of an image.
static int	SOS Marks the start of scan.

Constructor Summary

JPEGInfo()

Method Summary

void	decode(byte[] image) Decode a JPEG encoded image.
int	getHeight() Return the height of the image in pixels, not twips.
int	getWidth() Get the width of the image in pixels, not twips.

Methods inherited from class java.lang.Object

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

Field Detail

SOI

public static final int SOI

Marks the start of an image.

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Constant Field Values

EOI

public static final int EOI

Marks the end of an image.

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Constant Field Values

SOF0

public static final int SOF0

Marks the start of a frame - baseline DCT.

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Constant Field Values

SOF2

public static final int SOF2

Marks the start of a frame - progressive DCT.

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Constant Field Values

JPG

public static final int JPG

Marks the start of a JPG block.

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Constant Field Values

SOFF

public static final int SOFF

Marks the start of a JPG block.

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Constant Field Values

DHT

public static final int DHT

Marks the Huffman table.

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Constant Field Values

DQT

public static final int DQT

Marks the quantization table.

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Constant Field Values

DRI

public static final int DRI

Marks the restart interval.

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Constant Field Values

SOS

public static final int SOS

Marks the start of scan.

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Constant Field Values

RST

public static final int RST

Marks a restart.

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Constant Field Values

APP

public static final int APP

Marks the start of an application specific block.

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Constant Field Values

COM

public static final int COM

Marks the start of an comment block.

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Constant Field Values

Constructor Detail

JPEGInfo

public JPEGInfo()

Method Detail

getWidth

public int getWidth()

Get the width of the image in pixels, not twips.

Returns:

the width of the image

getHeight

public int getHeight()

Return the height of the image in pixels, not twips.

Returns:

the height of the image

decode

public void decode(byte[] image)

Decode a JPEG encoded image.

Parameters:

image - the image data.