Package nom.tam.image.compression.tile.mask

Class AbstractNullPixelMask

java.lang.Object

nom.tam.image.compression.tile.mask.AbstractNullPixelMask

Direct Known Subclasses:

NullPixelMaskPreserver, NullPixelMaskRestorer

public class AbstractNullPixelMask
extends Object

(for internal use) Base support for blank (null) in compressed images. In regular images specific values (such as Double.NaN or a specific integer value) may be used to indicate missing data. However, because of e.g. quantization or lossy compression, these specific values may not be recovered exactly when compressing / decompressing images. Hence, there is a need to demark null values differently in copmressed images. This class provides support for that purpose.

Field Summary

Fields

Modifier and Type	Field	Description
protected static final byte	NULL_INDICATOR

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	AbstractNullPixelMask(TileBuffer tileBuffer, int tileIndex, long nullValue, ICompressorControl compressorControl)

Method Summary

Modifier and Type	Method	Description
protected ICompressorControl	getCompressorControl()
protected ByteBuffer	getMask()
byte[]	getMaskBytes()
protected long	getNullValue()
protected TileBuffer	getTileBuffer()
protected int	getTileIndex()
protected ByteBuffer	initializedMask(int remaining)
void	setMask(ByteBuffer mask)

Methods inherited from class java.lang.Object

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

Field Details

NULL_INDICATOR

protected static final byte NULL_INDICATOR

See Also:

• Constant Field Values

Constructor Details

AbstractNullPixelMask

protected AbstractNullPixelMask(TileBuffer tileBuffer,
 int tileIndex,
 long nullValue,
 ICompressorControl compressorControl)

Method Details

getMaskBytes

public byte[] getMaskBytes()

setMask

public void setMask(ByteBuffer mask)

getCompressorControl

protected ICompressorControl getCompressorControl()

getMask

protected ByteBuffer getMask()

getNullValue

protected long getNullValue()

getTileBuffer

protected TileBuffer getTileBuffer()

getTileIndex

protected int getTileIndex()

initializedMask

protected ByteBuffer initializedMask(int remaining)