1/* 2 * Copyright (C) 2007 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#ifndef ANDROID_SURFACE_FLINGER_CLZ_H 18 19#include <stdint.h> 20 21namespace android { 22 23int inline clz(int32_t x) { 24 return __builtin_clz(x); 25} 26 27template <typename T> 28static inline T min(T a, T b) { 29 return a<b ? a : b; 30} 31template <typename T> 32static inline T min(T a, T b, T c) { 33 return min(a, min(b, c)); 34} 35template <typename T> 36static inline T min(T a, T b, T c, T d) { 37 return min(a, b, min(c, d)); 38} 39 40template <typename T> 41static inline T max(T a, T b) { 42 return a>b ? a : b; 43} 44template <typename T> 45static inline T max(T a, T b, T c) { 46 return max(a, max(b, c)); 47} 48template <typename T> 49static inline T max(T a, T b, T c, T d) { 50 return max(a, b, max(c, d)); 51} 52 53template <typename T> 54static inline 55void swap(T& a, T& b) { 56 T t(a); 57 a = b; 58 b = t; 59} 60 61 62}; // namespace android 63 64#endif /* ANDROID_SURFACE_FLINGER_CLZ_H */ 65