1 /* 2 * Copyright 2022 Google LLC 3 * 4 * Use of this source code is governed by a BSD-style license that can be 5 * found in the LICENSE file. 6 */ 7 8 #ifndef SkAlign_DEFINED 9 #define SkAlign_DEFINED 10 11 #include "include/private/base/SkAssert.h" 12 13 #include <cstddef> 14 SkAlign2(T x)15template <typename T> static constexpr T SkAlign2(T x) { return (x + 1) >> 1 << 1; } SkAlign4(T x)16template <typename T> static constexpr T SkAlign4(T x) { return (x + 3) >> 2 << 2; } SkAlign8(T x)17template <typename T> static constexpr T SkAlign8(T x) { return (x + 7) >> 3 << 3; } 18 SkIsAlign2(T x)19template <typename T> static constexpr bool SkIsAlign2(T x) { return 0 == (x & 1); } SkIsAlign4(T x)20template <typename T> static constexpr bool SkIsAlign4(T x) { return 0 == (x & 3); } SkIsAlign8(T x)21template <typename T> static constexpr bool SkIsAlign8(T x) { return 0 == (x & 7); } 22 SkAlignPtr(T x)23template <typename T> static constexpr T SkAlignPtr(T x) { 24 return sizeof(void*) == 8 ? SkAlign8(x) : SkAlign4(x); 25 } SkIsAlignPtr(T x)26template <typename T> static constexpr bool SkIsAlignPtr(T x) { 27 return sizeof(void*) == 8 ? SkIsAlign8(x) : SkIsAlign4(x); 28 } 29 30 /** 31 * align up to a power of 2 32 */ SkAlignTo(size_t x,size_t alignment)33static inline constexpr size_t SkAlignTo(size_t x, size_t alignment) { 34 // The same as alignment && SkIsPow2(value), w/o a dependency cycle. 35 SkASSERT(alignment && (alignment & (alignment - 1)) == 0); 36 return (x + alignment - 1) & ~(alignment - 1); 37 } 38 39 #endif 40