1 /* 2 * Copyright 2022 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_HWC_VSYNCTHREAD_H 18 #define ANDROID_HWC_VSYNCTHREAD_H 19 20 #include <aidl/android/hardware/graphics/composer3/VsyncPeriodChangeConstraints.h> 21 #include <aidl/android/hardware/graphics/composer3/VsyncPeriodChangeTimeline.h> 22 #include <android/hardware/graphics/common/1.0/types.h> 23 24 #include <chrono> 25 #include <mutex> 26 #include <optional> 27 #include <thread> 28 29 #include "Common.h" 30 31 namespace aidl::android::hardware::graphics::composer3::impl { 32 33 // Generates Vsync signals in software. 34 class VsyncThread { 35 public: 36 VsyncThread(int64_t id); 37 virtual ~VsyncThread(); 38 39 VsyncThread(const VsyncThread&) = delete; 40 VsyncThread& operator=(const VsyncThread&) = delete; 41 42 VsyncThread(VsyncThread&&) = delete; 43 VsyncThread& operator=(VsyncThread&&) = delete; 44 45 HWC3::Error start(int32_t periodNanos); 46 47 HWC3::Error setCallbacks(const std::shared_ptr<IComposerCallback>& callback); 48 49 HWC3::Error setVsyncEnabled(bool enabled); 50 51 HWC3::Error scheduleVsyncUpdate( 52 int32_t newVsyncPeriod, 53 const VsyncPeriodChangeConstraints& newVsyncPeriodChangeConstraints, 54 VsyncPeriodChangeTimeline* timeline); 55 56 private: 57 HWC3::Error stop(); 58 59 void threadLoop(); 60 61 std::chrono::nanoseconds updateVsyncPeriodLocked( 62 std::chrono::time_point<std::chrono::steady_clock> now); 63 64 const int64_t mDisplayId; 65 66 std::thread mThread; 67 68 std::mutex mStateMutex; 69 70 std::atomic<bool> mShuttingDown{false}; 71 72 std::shared_ptr<IComposerCallback> mCallbacks; 73 74 bool mVsyncEnabled = false; 75 std::chrono::nanoseconds mVsyncPeriod; 76 std::chrono::time_point<std::chrono::steady_clock> mPreviousVsync; 77 78 struct PendingUpdate { 79 std::chrono::nanoseconds period; 80 std::chrono::time_point<std::chrono::steady_clock> updateAfter; 81 }; 82 std::optional<PendingUpdate> mPendingUpdate; 83 }; 84 85 } // namespace aidl::android::hardware::graphics::composer3::impl 86 87 #endif 88