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javax.imageio.plugins.jpeg
Class JPEGImageReadParam  

java.lang.Object
  javax.imageio.IIOParam
      javax.imageio.ImageReadParam
          javax.imageio.plugins.jpeg.JPEGImageReadParam

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public class JPEGImageReadParam

extends javax.imageio.ImageReadParam

The JPEGImageReadParam class is only used to set JPEG decoding tables for streams that do not provide their own tables. If a stream does not provide tables and a custom JPEGImageReadParam is not provided, then the standard JPEG tables are used from the JPEGQTable and JPEGHuffmanTable classes. If a stream does provide decoding tables then JPEGImageReadParam will be ignored. JPEGImageReadParam cannot be used to retrieve the tables from a stream. Instead, use IIOMetadata for this purpose. A JPEGImageReadParam instance is retrieved from the built-in JPEG ImageReader using the getDefaultImageReadParam method.

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Field Summary
private  JPEGHuffmanTable[]	ACHuffmanTables
private  JPEGHuffmanTable[]	DCHuffmanTables
private  JPEGQTable[]	qTables

 

Fields inherited from class javax.imageio.ImageReadParam

canSetSourceRenderSize, destination, destinationBands, minProgressivePass, numProgressivePasses, sourceRenderSize

 

Fields inherited from class javax.imageio.IIOParam

controller, defaultController, destinationOffset, destinationType, sourceBands, sourceRegion, sourceXSubsampling, sourceYSubsampling, subsamplingXOffset, subsamplingYOffset

 

Constructor Summary

JPEGImageReadParam()           Construct a JPEGImageReadParam.

 

Method Summary
boolean	areTablesSet()           Check if the decoding tables are set.
JPEGHuffmanTable[]	getACHuffmanTables()           Retrieve the AC Huffman tables.
JPEGHuffmanTable[]	getDCHuffmanTables()           Retrieve the DC Huffman tables.
JPEGQTable[]	getQTables()           Retrieve the quantization tables.
void	setDecodeTables(JPEGQTable[] qTables, JPEGHuffmanTable[] DCHuffmanTables, JPEGHuffmanTable[] ACHuffmanTables)           Set the quantization and Huffman tables that will be used to decode the stream.
void	unsetDecodeTables()           Clear the quantization and Huffman decoding tables.

 

Methods inherited from class javax.imageio.ImageReadParam

canSetSourceRenderSize, getDestination, getDestinationBands, getSourceMaxProgressivePass, getSourceMinProgressivePass, getSourceNumProgressivePasses, getSourceRenderSize, setDestination, setDestinationBands, setSourceProgressivePasses, setSourceRenderSize

 

Methods inherited from class javax.imageio.IIOParam

activateController, getController, getDefaultController, getDestinationOffset, getDestinationType, getSourceBands, getSourceRegion, getSourceXSubsampling, getSourceYSubsampling, getSubsamplingXOffset, getSubsamplingYOffset, hasController, setController, setDestinationOffset, setDestinationType, setSourceBands, setSourceRegion, setSourceSubsampling

 

Methods inherited from class java.lang.Object

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

 

Field Detail

qTables

private JPEGQTable[] qTables

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DCHuffmanTables

private JPEGHuffmanTable[] DCHuffmanTables

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ACHuffmanTables

private JPEGHuffmanTable[] ACHuffmanTables

Constructor Detail

JPEGImageReadParam

public JPEGImageReadParam()

Construct a JPEGImageReadParam.

Method Detail

areTablesSet

public boolean areTablesSet()

Check if the decoding tables are set.

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setDecodeTables

public void setDecodeTables(JPEGQTable[] qTables,
                            JPEGHuffmanTable[] DCHuffmanTables,
                            JPEGHuffmanTable[] ACHuffmanTables)

Set the quantization and Huffman tables that will be used to decode the stream. Copies are created of the array arguments. The number of Huffman tables must be the same in both Huffman table arrays. No argument may be null and no array may be longer than four elements.

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unsetDecodeTables

public void unsetDecodeTables()

Clear the quantization and Huffman decoding tables.

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getQTables

public JPEGQTable[] getQTables()

Retrieve the quantization tables.

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getDCHuffmanTables

public JPEGHuffmanTable[] getDCHuffmanTables()

Retrieve the DC Huffman tables.

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getACHuffmanTables

public JPEGHuffmanTable[] getACHuffmanTables()

Retrieve the AC Huffman tables.

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Overview  Package   Class  Use  Deprecated  Index
Home >> All >> javax >> imageio >> plugins >> [ jpeg overview ]	PREV CLASS  NEXT CLASS
SUMMARY:  JAVADOC |  SOURCE |  DOWNLOAD | NESTED | FIELD | CONSTR | METHOD	DETAIL: FIELD | CONSTR | METHOD

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