gfx/skia/trunk/include/device/xps/SkConstexprMath.h@129ffea94266
gfx/skia/trunk/include/device/xps/SkConstexprMath.h
Sat, 03 Jan 2015 20:18:00 +0100
- author
- Michael Schloh von Bennewitz <michael@schloh.com>
- date
- Sat, 03 Jan 2015 20:18:00 +0100
- branch
- TOR_BUG_3246
- changeset 7
- 129ffea94266
- permissions
- -rw-r--r--
Conditionally enable double key logic according to:
private browsing mode or privacy.thirdparty.isolate preference and
implement in GetCookieStringCommon and FindCookie where it counts...
With some reservations of how to convince FindCookie users to test
condition and pass a nullptr when disabling double key logic.
1 /*
2 * Copyright 2011 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
8 #ifndef SkConstexprMath_DEFINED
9 #define SkConstexprMath_DEFINED
11 #include "SkTypes.h"
12 #include <limits.h>
14 template <uintmax_t N, uintmax_t B>
15 struct SK_LOG {
16 //! Compile-time constant ceiling(logB(N)).
17 static const uintmax_t value = 1 + SK_LOG<N/B, B>::value;
18 };
19 template <uintmax_t B>
20 struct SK_LOG<1, B> {
21 static const uintmax_t value = 0;
22 };
23 template <uintmax_t B>
24 struct SK_LOG<0, B> {
25 static const uintmax_t value = 0;
26 };
28 template<uintmax_t N>
29 struct SK_2N1 {
30 //! Compile-time constant (2^N)-1.
31 static const uintmax_t value = (SK_2N1<N-1>::value << 1) + 1;
32 };
33 template<>
34 struct SK_2N1<1> {
35 static const uintmax_t value = 1;
36 };
38 /** Compile-time constant number of base n digits in type t
39 if the bits of type t are considered as unsigned base two.
40 */
41 #define SK_BASE_N_DIGITS_IN(n, t) (\
42 SK_LOG<SK_2N1<(sizeof(t) * CHAR_BIT)>::value, n>::value\
43 )
44 /** Compile-time constant number of base 10 digits in type t
45 if the bits of type t are considered as unsigned base two.
46 */
47 #define SK_DIGITS_IN(t) SK_BASE_N_DIGITS_IN(10, (t))
49 // Compile-time constant maximum value of two unsigned values.
50 template <uintmax_t a, uintmax_t b> struct SkTUMax {
51 static const uintmax_t value = (b < a) ? a : b;
52 };
54 #endif
