com.emphysic.myriad.core.data.ops

Class PowerOfTwoOperation

java.lang.Object

com.emphysic.myriad.core.data.ops.PowerOfTwoOperation

All Implemented Interfaces:

DatasetOperation, ObjectMap, com.esotericsoftware.kryo.KryoSerializable

public class PowerOfTwoOperation
extends java.lang.Object
implements DatasetOperation

PowerOfTwoOperation - resizes an input as required such that its width and height are both powers of 2. Primarily used in blending pyramids.

Constructor Summary

Constructors

Constructor and Description
PowerOfTwoOperation()

Method Summary

Modifier and Type	Method and Description
long	getSerializationVersion() Returns the current version of the serialization format.
int	getVersion() Returns the current class version.
void	initCurrentVersion(java.util.Map<java.lang.String,java.lang.Object> objectMap) Initializes an instance with a current-version object graph.
static boolean	isPowerOf2(int a) Determines whether a number is a power of 2
static int	nextPowerOf2(int a) Returns the next power of two i.e.
static int	pad(int a) Returns the next number >= the input which is a power of two i.e.
Dataset	run(Dataset input) For each dimension in the input, if the dimension is not a power of 2 add elements of value 0 until this condition is satisified.

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.emphysic.myriad.core.data.util.ObjectMap

getObjectMap, init, initPreviousVersion, initUnknownVersion, load, read, save, write

Constructor Detail

PowerOfTwoOperation

public PowerOfTwoOperation()

Method Detail

nextPowerOf2

public static int nextPowerOf2(int a)

Returns the next power of two i.e. returns x such that 2^x >= a

Parameters:

a - number to pad

Returns:

the power x, or 0 if a = 0

pad

public static int pad(int a)

Returns the next number >= the input which is a power of two i.e. returns 2^x such that 2^x >= a

Parameters:

a - number to pad

Returns:

next power of two greater than or equal to a

isPowerOf2

public static boolean isPowerOf2(int a)

Determines whether a number is a power of 2

Parameters:

a - number to examine

Returns:

true if a is greater than 0 and a power of 2, false otherwise

run

public Dataset run(Dataset input)

For each dimension in the input, if the dimension is not a power of 2 add elements of value 0 until this condition is satisified. Thus if both width and height are increased, the original data will be in the lower-left corner of the new Dataset, surrounded by an L-shaped sequence of 0's.

Specified by:

run in interface DatasetOperation

Parameters:

input - Dataset on which to operate

Returns:

possibly-resized Dataset, or null if input was null.

getSerializationVersion

public long getSerializationVersion()

Description copied from interface: ObjectMap

Returns the current version of the serialization format. Increments when the serialization format changes, i.e. backwards compatibility is broken.

Specified by:

getSerializationVersion in interface ObjectMap

Returns:

serialization version

getVersion

public int getVersion()

Description copied from interface: ObjectMap

Returns the current class version. Class version increments when the class changes but doesn't necessarily break compatibility with serialization.

Specified by:

getVersion in interface ObjectMap

Returns:

class version

initCurrentVersion

public void initCurrentVersion(java.util.Map<java.lang.String,java.lang.Object> objectMap)

Description copied from interface: ObjectMap

Initializes an instance with a current-version object graph.

Specified by:

initCurrentVersion in interface ObjectMap

Parameters:

objectMap - object graph for initialization