1 /* 2 * Copyright 2018 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 18 #pragma once 19 20 #include "Thread.h" 21 22 #include <thread> 23 #include <mutex> 24 25 namespace swappy { 26 27 class ChoreographerThread { 28 public: 29 enum class Type { 30 // choreographer ticks are provided by application 31 App, 32 33 // register internally with choreographer 34 Swappy, 35 }; 36 37 using Callback = std::function<void()>; 38 39 static std::unique_ptr<ChoreographerThread> createChoreographerThread( 40 Type type, JavaVM *vm, Callback onChoreographer); 41 42 virtual ~ChoreographerThread() = 0; 43 44 virtual void postFrameCallbacks(); 45 46 protected: 47 ChoreographerThread(Callback onChoreographer); 48 virtual void scheduleNextFrameCallback() REQUIRES(mWaitingMutex) = 0; 49 virtual void onChoreographer(); 50 51 std::mutex mWaitingMutex; 52 int mCallbacksBeforeIdle GUARDED_BY(mWaitingMutex) = 0; 53 Callback mCallback; 54 55 static constexpr int MAX_CALLBACKS_BEFORE_IDLE = 10; 56 57 private: 58 static int getSDKVersion(JavaVM *vm); 59 static bool isChoreographerCallbackClassLoaded(JavaVM *vm); 60 }; 61 62 } // namespace swappy 63