BImage.cpp File Reference

#include "BImage.h"
#include <malloc.h>

Functions
template<typename T>
T	lmax (T a, T b)
template<typename T>
T	lmin (T a, T b)
static unsigned long	bsqrt (unsigned long x)
unsigned long	getSqrt (unsigned int x)

Variables
unsigned long *	sqrt_table = NULL

Function Documentation

lmax()

template<typename T>

T lmax	(	T	a,
		T	b )

{ return ((a > b) ? a : b); }

lmin()

template<typename T>

T lmin	(	T	a,
		T	b )

{ return ((a < b) ? a : b); }

bsqrt()

static unsigned long bsqrt ( unsigned long x )

static

{
    if (x <= 0) return 0;
    if (x == 1) return 1;
 
    unsigned long r = x >> 1;
    unsigned long q;
 
    while (1)
    {
        q = x / r;
        if (q >= r) return r;
        r = (r + q) >> 1;
    }
}

getSqrt()

unsigned long getSqrt

(

unsigned int

x

)

{
    if (!sqrt_table)
    {
        // build sqrt table for use with elliptic gradient
        sqrt_table = new unsigned long[(256 * 256 * 2) + 1];
 
        for (int i = 0; i < (256 * 256 * 2); i++)
            *(sqrt_table + i) = bsqrt(i);
    }
    return (*(sqrt_table + x));
}

Variable Documentation

sqrt_table

unsigned long* sqrt_table = NULL