| jj2000.j2k.image.BlkImgDataSrc
All known Subclasses: com.sun.media.imageioimpl.plugins.jpeg2000.RenderedImageSrc, jj2000.j2k.image.forwcomptransf.ForwCompTransf, jj2000.j2k.image.invcomptransf.InvCompTransf, jj2000.j2k.image.Tiler, jj2000.j2k.image.input.ImgReader, jj2000.j2k.image.ImgDataConverter, jj2000.j2k.image.ImgDataJoiner, jj2000.j2k.wavelet.synthesis.InverseWT,
| BlkImgDataSrc | | public interface BlkImgDataSrc extends ImgData(Code) | | This interface defines the methods to transfer image data in blocks,
without following any particular order (random access). This interface does
not define the methods to access the image characteristics, such as width,
height, number of components, tiles, etc., or to change the current
tile. That is provided by other interfaces such as ImgData.
This interface has the notion of a current tile. All data, coordinates
and dimensions are always relative to the current tile. If there is only
one tile then it is equivalent as having no tiles.
A block of requested data may never cross tile boundaries. This should
be enforced by the implementing class, or the source of image data.
This interface defines the methods that can be used to retrieve image
data. Implementing classes need not buffer all the image data, they can ask
their source to load the data they need.
See Also: ImgData |
| Method Summary | |
| public DataBlk | getCompData(DataBlk blk, int c)
Returns, in the blk argument, a block of image data containing the
specifed rectangular area, in the specified component. | | public int | getFixedPoint(int c)
Returns the position of the fixed point in the specified component, or
equivalently the number of fractional bits. | | public DataBlk | getInternCompData(DataBlk blk, int c)
Returns, in the blk argument, a block of image data containing the
specifed rectangular area, in the specified component. |
| getCompData | | public DataBlk getCompData(DataBlk blk, int c)(Code) | | Returns, in the blk argument, a block of image data containing the
specifed rectangular area, in the specified component. The data is
returned, as a copy of the internal data, therefore the returned data
can be modified "in place".
The rectangular area to return is specified by the 'ulx', 'uly', 'w'
and 'h' members of the 'blk' argument, relative to the current
tile. These members are not modified by this method. The 'offset' of
the returned data is 0, and the 'scanw' is the same as the block's
width. See the 'DataBlk' class.
This method, in general, is less efficient than the
'getInternCompData()' method since, in general, it copies the
data. However if the array of returned data is to be modified by the
caller then this method is preferable.
If the data array in 'blk' is 'null', then a new one is created. If
the data array is not 'null' then it is reused, and it must be large
enough to contain the block's data. Otherwise an 'ArrayStoreException'
or an 'IndexOutOfBoundsException' is thrown by the Java system.
The returned data may have its 'progressive' attribute set. In this
case the returned data is only an approximation of the "final" data.
Parameters:
blk - Its coordinates and dimensions specify the area to return,relative to the current tile. If it contains a non-null data array,then it must be large enough. If it contains a null data array a newone is created. Some fields in this object are modified to return thedata.
Parameters:
c - The index of the component from which to get the data.
See Also: BlkImgDataSrc.getInternCompData |
| getFixedPoint | | public int getFixedPoint(int c)(Code) | | 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.
Parameters:
c - The index of the component. The position of the fixed-point, which is the same as thenumber of fractional bits. For floating-point data 0 is returned. |
| getInternCompData | | public DataBlk getInternCompData(DataBlk blk, int c)(Code) | | Returns, in the blk argument, a block of image data containing the
specifed rectangular area, in the specified component. The data is
returned, as a reference to the internal data, if any, instead of as a
copy, therefore the returned data should not be modified.
The rectangular area to return is specified by the 'ulx', 'uly', 'w'
and 'h' members of the 'blk' argument, relative to the current
tile. These members are not modified by this method. The 'offset' and
'scanw' of the returned data can be arbitrary. See the 'DataBlk' class.
This method, in general, is more efficient than the 'getCompData()'
method since it may not copy the data. However if the array of returned
data is to be modified by the caller then the other method is probably
preferable.
If possible, the data in the returned 'DataBlk' should be the
internal data itself, instead of a copy, in order to increase the data
transfer efficiency. However, this depends on the particular
implementation (it may be more convenient to just return a copy of the
data). This is the reason why the returned data should not be modified.
If the data array in blk is null, then a new one
is created if necessary. The implementation of this interface may
choose to return the same array or a new one, depending on what is more
efficient. Therefore, the data array in blk prior to the
method call should not be considered to contain the returned data, a
new array may have been created. Instead, get the array from
blk after the method has returned.
The returned data may have its 'progressive' attribute set. In this
case the returned data is only an approximation of the "final" data.
Parameters:
blk - Its coordinates and dimensions specify the area to return,relative to the current tile. Some fields in this object are modifiedto return the data.
Parameters:
c - The index of the component from which to get the data. The requested DataBlk
See Also: BlkImgDataSrc.getCompData |
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