1 /* 2 * Copyright 2021 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 <android/hardware/graphics/common/1.0/types.h> 21 #include <utils/Thread.h> 22 23 #include <chrono> 24 #include <mutex> 25 #include <optional> 26 27 #include "Common.h" 28 29 namespace android { 30 31 // Generates Vsync signals in software. 32 class VsyncThread : public Thread { 33 public: 34 VsyncThread(hwc2_display_t id); ~VsyncThread()35 virtual ~VsyncThread() {} 36 37 VsyncThread(const VsyncThread&) = default; 38 VsyncThread& operator=(const VsyncThread&) = default; 39 40 VsyncThread(VsyncThread&&) = default; 41 VsyncThread& operator=(VsyncThread&&) = default; 42 43 HWC2::Error start(hwc2_vsync_period_t period); 44 45 HWC2::Error setVsyncCallback(HWC2_PFN_VSYNC callback, 46 hwc2_callback_data_t callbackData); 47 HWC2::Error setVsync24Callback(HWC2_PFN_VSYNC_2_4 callback, 48 hwc2_callback_data_t callbackData); 49 50 HWC2::Error setVsyncEnabled(bool enabled); 51 52 HWC2::Error scheduleVsyncUpdate( 53 hwc2_vsync_period_t newVsyncPeriod, 54 hwc_vsync_period_change_constraints_t* newVsyncPeriodChangeConstraints, 55 hwc_vsync_period_change_timeline_t* timeline); 56 57 private: 58 bool threadLoop() final; 59 60 std::chrono::nanoseconds updateVsyncPeriodLocked( 61 std::chrono::time_point<std::chrono::steady_clock> now); 62 63 const hwc2_display_t mDisplayId; 64 65 std::mutex mStateMutex; 66 67 HWC2_PFN_VSYNC mVsyncCallback; 68 hwc2_callback_data_t mVsyncCallbackData = nullptr; 69 70 HWC2_PFN_VSYNC_2_4 mVsync24Callback; 71 hwc2_callback_data_t mVsync24CallbackData = nullptr; 72 73 bool mVsyncEnabled = false; 74 std::chrono::nanoseconds mVsyncPeriod; 75 std::chrono::time_point<std::chrono::steady_clock> mPreviousVsync; 76 77 struct PendingUpdate { 78 std::chrono::nanoseconds period; 79 std::chrono::time_point<std::chrono::steady_clock> updateAfter; 80 }; 81 std::optional<PendingUpdate> mPendingUpdate; 82 }; 83 84 } // namespace android 85 86 #endif