Spec-Zone .ru
спецификации, руководства, описания, API
Please note that the specifications and other information contained herein are not final and are subject to change. The information is being made available to you solely for purpose of evaluation.

Java™ Platform
Standard Ed. 7

DRAFT ea-b118

javax.imageio.plugins.jpeg
Class JPEGHuffmanTable

java.lang.Object
  extended by javax.imageio.plugins.jpeg.JPEGHuffmanTable

public class JPEGHuffmanTable
extends Object

A class encapsulating a single JPEG Huffman table. Fields are provided for the "standard" tables taken from Annex K of the JPEG specification. These are the tables used as defaults.

For more information about the operation of the standard JPEG plug-in, see the JPEG metadata format specification and usage notes


Field Summary
Modifier and Type Field and Description
static JPEGHuffmanTable StdACChrominance
          The standard AC chrominance Huffman table.
static JPEGHuffmanTable StdACLuminance
          The standard AC luminance Huffman table.
static JPEGHuffmanTable StdDCChrominance
          The standard DC chrominance Huffman table.
static JPEGHuffmanTable StdDCLuminance
          The standard DC luminance Huffman table.
 
Constructor Summary
Constructor and Description
JPEGHuffmanTable(short[] lengths, short[] values)
          Creates a Huffman table and initializes it.
 
Method Summary
Modifier and Type Method and Description
 short[] getLengths()
          Returns an array of shorts containing the number of values for each length in the Huffman table.
 short[] getValues()
          Returns an array of shorts containing the values arranged by increasing length of their corresponding codes.
 String toString()
          Returns a String representing this Huffman table.
 
Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait
 

Field Detail

StdDCLuminance

public static final JPEGHuffmanTable StdDCLuminance
The standard DC luminance Huffman table.


StdDCChrominance

public static final JPEGHuffmanTable StdDCChrominance
The standard DC chrominance Huffman table.


StdACLuminance

public static final JPEGHuffmanTable StdACLuminance
The standard AC luminance Huffman table.


StdACChrominance

public static final JPEGHuffmanTable StdACChrominance
The standard AC chrominance Huffman table.

Constructor Detail

JPEGHuffmanTable

public JPEGHuffmanTable(short[] lengths,
                        short[] values)
Creates a Huffman table and initializes it. The input arrays are copied. The arrays must describe a possible Huffman table. For example, 3 codes cannot be expressed with a single bit.

Parameters:
lengths - an array of shorts where lengths[k] is equal to the number of values with corresponding codes of length k + 1 bits.
values - an array of shorts containing the values in order of increasing code length.
Throws:
IllegalArgumentException - if lengths or values are null, the length of lengths is greater than 16, the length of values is greater than 256, if any value in lengths or values is less than zero, or if the arrays do not describe a valid Huffman table.
Method Detail

getLengths

public short[] getLengths()
Returns an array of shorts containing the number of values for each length in the Huffman table. The returned array is a copy.

Returns:
a short array where array[k-1] is equal to the number of values in the table of length k.
See Also:
getValues()

getValues

public short[] getValues()
Returns an array of shorts containing the values arranged by increasing length of their corresponding codes. The interpretation of the array is dependent on the values returned from getLengths. The returned array is a copy.

Returns:
a short array of values.
See Also:
getLengths()

toString

public String toString()
Returns a String representing this Huffman table.

Overrides:
toString in class Object
Returns:
a String representing this Huffman table.

Java™ Platform
Standard Ed. 7

DRAFT ea-b118

Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.

Copyright © 1993, 2010, Oracle Corporation. All rights reserved.
DRAFT ea-b118

Scripting on this page tracks web page traffic, but does not change the content in any way.