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CSJ2K.j2k.wavelet.analysis.CBlkWTDataSrc

CBlkWTDataSrc Interface

This abstract class defines methods to transfer wavelet data in a code-block by code-block basis. In each call to 'getNextCodeBlock()' or 'getNextInternCodeBlock()' a new code-block is returned. The code-blocks are returned in no specific order.

       <p>This class is the source of data for the quantizer. See the 'Quantizer'
       class.</p><p>Note that no more of one object may request data, otherwise one object
       would get some of the data and another one another part, in no defined
       manner.</p>
Namespace: CSJ2K.j2k.wavelet.analysis
Assembly: C1.WPF.PdfViewer.4.6.2.dll
Syntax
public interface CBlkWTDataSrc : ForwWTDataProps, ImgData

Methods

Name Description
getDataType(int, int)

Return the data type of this CBlkWTDataSrc for the given component in the current tile. Its value should be either DataBlk.TYPE_INT or DataBlk.TYPE_FLOAT but can change according to the current tile-component.
getFixedPoint(int)

Returns the position of the fixed point in the specified component, or equivalently the number of fractional bits. This is the position of the least significant integral (i.e. non-fractional) bit, which is equivalent to the number of fractional bits. For instance, for fixed-point values with 2 fractional bits, 2 is returned. For floating-point data this value does not apply and 0 should be returned. Position 0 is the position of the least significant bit in the data.
getNextCodeBlock(int, CBlkWTData)

Returns the next code-block in the current tile for the specified component, as a copy (see below). The order in which code-blocks are returned is not specified. However each code-block is returned only once and all code-blocks will be returned if the method is called 'N' times, where 'N' is the number of code-blocks in the tile. After all the code-blocks have been returned for the current tile calls to this method will return 'null'.

       <p>When changing the current tile (through 'setTile()' or 'nextTile()')
       this method will always return the first code-block, as if this method
       was never called before for the new current tile.</p><p>The data returned by this method is always a copy of the internal
       data of this object, if any, and it can be modified "in place" without
       any problems after being returned. The 'offset' of the returned data is
       0, and the 'scanw' is the same as the code-block width.  The 'magbits'
       of the returned data is not set by this method and should be
       ignored. See the 'CBlkWTData' class.</p><p>The 'ulx' and 'uly' members of the returned 'CBlkWTData' object
       contain the coordinates of the top-left corner of the block, with
       respect to the tile, not the subband.</p>
getNextInternCodeBlock(int, CBlkWTData)

Returns the next code-block in the current tile for the specified component. The order in which code-blocks are returned is not specified. However each code-block is returned only once and all code-blocks will be returned if the method is called 'N' times, where 'N' is the number of code-blocks in the tile. After all the code-blocks have been returned for the current tile calls to this method will return 'null'.

       <p>When changing the current tile (through 'setTile()' or 'nextTile()')
       this method will always return the first code-block, as if this method
       was never called before for the new current tile.</p><p>The data returned by this method can be the data in the internal
       buffer of this object, if any, and thus can not be modified by the
       caller. The 'offset' and 'scanw' of the returned data can be
       arbitrary. The 'magbits' of the returned data is not set by this method
       and should be ignored. See the 'CBlkWTData' class.</p><p>The 'ulx' and 'uly' members of the returned 'CBlkWTData' object
       contain the coordinates of the top-left corner of the block, with
       respect to the tile, not the subband.</p>

See Also