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DEMOS DOCS API SAMPLES DOWNLOAD
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CSJ2K.j2k.image.DataBlk

DataBlk Class

This is a generic abstract class to store data from a block of an image. This class does not have the notion of components. Therefore, it should be used for data from a single component. Subclasses should implement the different types of storage (int, float, etc.).

       <p>The data is always stored in one array, of the type matching the data
       type (i.e. for 'int' it's an 'int[]'). The data should be stored in the
       array in standard scan-line order. That is the samples go from the top-left
       corner of the code-block to the lower-right corner by line and then
       column.</p><p>The member variable 'offset' gives the index in the array of the first
       data element (i.e. the top-left coefficient (ulx,uly)). The member variable
       'scanw' gives the width of the scan that is used to store the data, that
       can be different from the width of the block. Element '(x,y)' of the
       code-block (i.e. '(ulx,uly)' is the top-left coefficient), will appear at
       position 'offset+(y-uly)*scanw+(x-ulx)' in the array of data.</p><p>A block of data can have the <i>progressive</i> attribute set. Data is
       progressive when it is obtained by successive refinement and the values in
       this block are approximations of the "final" values. When the final values
       are returned the progressive attribute must be turned off.</p><p>The classes <tt>DataBlkInt</tt> and <tt>DataBlkFloat</tt> provide
       implementations for <tt>int</tt> and <tt>float</tt> types respectively.</p>
Inheritance
object
DataBlk
DataBlkFloat
DataBlkInt
Namespace: CSJ2K.j2k.image
Assembly: C1.WPF.PdfViewer.4.6.2.dll
Syntax
public abstract class DataBlk

Constructors

Name Description
DataBlk()

Fields

Name Description
TYPE_BYTE

The identifier for the byte data type, as signed 8 bits.
TYPE_FLOAT

The identifier for the float data type
TYPE_INT

The identifier for the int data type, as signed 32 bits.
TYPE_SHORT

The identifier for the short data type, as signed 16 bits.
h

The height of the block, in pixels.
offset

The offset in the array of the top-left coefficient
progressive

The progressive attribute (false by default)
scanw

The width of the scanlines used to store the data in the array
ulx

The horizontal coordinate (in pixels) of the upper-left corner of the block of data. This is relative to the component of the image from where this block was filled or is to be filled.
uly

The vertical coordinate of the upper-left corner of the block of data. This is relative to the component of the image from where this block was filled or is to be filled.
w

The width of the block, in pixels.

Properties

Name Description
Data

Returns the array containing the data, or null if there is no data. The returned array is of the type returned by getDataType() (e.g., for TYPE_INT, it is a int[]).

       <p>Each implementing class should provide a type specific equivalent
       method (e.g., <tt>getDataInt()</tt> in <tt>DataBlkInt</tt>) which
       returns an array of the correct type explicetely and not through an
       <tt>Object</tt>.</p>
DataType

Returns the data type of the DataBlk object, as defined in this class.

Methods

Name Description
ToString()

Returns a string of informations about the DataBlk
getSize(int)

Returns the size in bits, given the data type. The data type must be one defined in this class. An IllegalArgumentException is thrown if type is not defined in this class.

See Also