blob: 8a791030fceea544b13e0ba22582f21331f85359 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
|
/* 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;
}
|
