1 /* 2 * Copyright (C) 2014 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 #ifndef TIMELORD_H 17 #define TIMELORD_H 18 19 #include <utils/Timers.h> 20 21 namespace android { 22 namespace uirenderer { 23 namespace renderthread { 24 25 class RenderThread; 26 27 // This class serves as a helper to filter & manage frame times from multiple sources 28 // ensuring that time flows linearly and smoothly 29 class TimeLord { 30 public: setFrameInterval(nsecs_t intervalNanos)31 void setFrameInterval(nsecs_t intervalNanos) { mFrameIntervalNanos = intervalNanos; } 32 void vsyncReceived(nsecs_t vsync); 33 nsecs_t computeFrameTimeMs(); 34 35 private: 36 friend class RenderThread; 37 38 TimeLord(); ~TimeLord()39 ~TimeLord() {} 40 41 nsecs_t mFrameIntervalNanos; 42 nsecs_t mFrameTimeNanos; 43 }; 44 45 } /* namespace renderthread */ 46 } /* namespace uirenderer */ 47 } /* namespace android */ 48 49 #endif /* TIMELORD_H */ 50