com.jogamp.common.util

Class Bitfield.Util

java.lang.Object

com.jogamp.common.util.Bitfield.Util

Enclosing interface:

Bitfield

public static class Bitfield.Util
extends Object

Bit operation utilities (static).

Constructor Summary

Constructors

Constructor and Description
Bitfield.Util()

Method Summary

Methods

Modifier and Type	Method and Description
static int	bitCount(int n) Returns the number of set bits within given 32bit integer in O(1) using a HAKEM 169 Bit Count inspired implementation:
static int	getBitMask(int n) Returns the 32 bit mask of n-bits, i.e.

Methods inherited from class java.lang.Object

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

Constructor Detail

Bitfield.Util

public Bitfield.Util()

Method Detail

getBitMask

public static int getBitMask(int n)

Returns the 32 bit mask of n-bits, i.e. n low order 1’s.

Implementation handles n == 32.

Throws:

IndexOutOfBoundsException - if b is out of bounds, i.e. > 32

bitCount

public static final int bitCount(int n)

Returns the number of set bits within given 32bit integer in O(1) using a HAKEM 169 Bit Count inspired implementation:

   http://www.inwap.com/pdp10/hbaker/hakmem/hakmem.html
   http://home.pipeline.com/~hbaker1/hakmem/hacks.html#item169
   http://tekpool.wordpress.com/category/bit-count/
   http://www.hackersdelight.org/