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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2001-2002 NaN Holding BV. All rights reserved. */
/** \file
* \ingroup bli
*/
#include "BLI_math.h"
#include "BLI_strict_flags.h"
int pow_i(int base, int exp)
{
int result = 1;
BLI_assert(exp >= 0);
while (exp) {
if (exp & 1) {
result *= base;
}
exp >>= 1;
base *= base;
}
return result;
}
double double_round(double x, int ndigits)
{
/* From Python 3.1 `floatobject.c`. */
double pow1, pow2, y, z;
if (ndigits >= 0) {
pow1 = pow(10.0, (double)ndigits);
pow2 = 1.0;
y = (x * pow1) * pow2;
/* if y overflows, then rounded value is exactly x */
if (!isfinite(y)) {
return x;
}
}
else {
pow1 = pow(10.0, (double)-ndigits);
pow2 = 1.0; /* unused; silences a gcc compiler warning */
y = x / pow1;
}
z = round(y);
if (fabs(y - z) == 0.5) {
/* halfway between two integers; use round-half-even */
z = 2.0 * round(y / 2.0);
}
if (ndigits >= 0) {
z = (z / pow2) / pow1;
}
else {
z *= pow1;
}
/* if computation resulted in overflow, raise OverflowError */
return z;
}
float floor_power_of_10(float f)
{
BLI_assert(!(f < 0.0f));
if (f != 0.0f) {
return 1.0f / (powf(10.0f, ceilf(log10f(1.0f / f))));
}
return 0.0f;
}
float ceil_power_of_10(float f)
{
BLI_assert(!(f < 0.0f));
if (f != 0.0f) {
return 1.0f / (powf(10.0f, floorf(log10f(1.0f / f))));
}
return 0.0f;
}
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