Dan Stoza | 2713c30 | 2018-03-28 17:07:36 -0700 | [diff] [blame^] | 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 | #pragma once |
| 18 | |
| 19 | #include <utils/Errors.h> |
| 20 | |
| 21 | #include <mutex> |
| 22 | |
| 23 | using namespace android::surfaceflinger; |
| 24 | |
| 25 | namespace android { |
| 26 | |
| 27 | /* |
| 28 | * Modulates the vsync-offsets depending on current SurfaceFlinger state. |
| 29 | */ |
| 30 | class VSyncModulator { |
| 31 | public: |
| 32 | |
| 33 | enum TransactionStart { |
| 34 | EARLY, |
| 35 | NORMAL |
| 36 | }; |
| 37 | |
| 38 | // Sets the phase offsets |
| 39 | // |
| 40 | // early: the phase offset when waking up early. May be the same as late, in which case we don't |
| 41 | // shift offsets. |
| 42 | // late: the regular sf phase offset. |
| 43 | void setPhaseOffsets(nsecs_t early, nsecs_t late) { |
| 44 | mEarlyPhaseOffset = early; |
| 45 | mLatePhaseOffset = late; |
| 46 | mPhaseOffset = late; |
| 47 | } |
| 48 | |
| 49 | nsecs_t getEarlyPhaseOffset() const { |
| 50 | return mEarlyPhaseOffset; |
| 51 | } |
| 52 | |
| 53 | void setEventThread(EventThread* eventThread) { |
| 54 | mEventThread = eventThread; |
| 55 | } |
| 56 | |
| 57 | void setTransactionStart(TransactionStart transactionStart) { |
| 58 | if (transactionStart == mTransactionStart) return; |
| 59 | mTransactionStart = transactionStart; |
| 60 | updatePhaseOffsets(); |
| 61 | } |
| 62 | |
| 63 | void setLastFrameUsedRenderEngine(bool re) { |
| 64 | if (re == mLastFrameUsedRenderEngine) return; |
| 65 | mLastFrameUsedRenderEngine = re; |
| 66 | updatePhaseOffsets(); |
| 67 | } |
| 68 | |
| 69 | private: |
| 70 | |
| 71 | void updatePhaseOffsets() { |
| 72 | |
| 73 | // Do not change phase offsets if disabled. |
| 74 | if (mEarlyPhaseOffset == mLatePhaseOffset) return; |
| 75 | |
| 76 | if (mTransactionStart == TransactionStart::EARLY || mLastFrameUsedRenderEngine) { |
| 77 | if (mPhaseOffset != mEarlyPhaseOffset) { |
| 78 | if (mEventThread) { |
| 79 | mEventThread->setPhaseOffset(mEarlyPhaseOffset); |
| 80 | } |
| 81 | mPhaseOffset = mEarlyPhaseOffset; |
| 82 | } |
| 83 | } else { |
| 84 | if (mPhaseOffset != mLatePhaseOffset) { |
| 85 | if (mEventThread) { |
| 86 | mEventThread->setPhaseOffset(mLatePhaseOffset); |
| 87 | } |
| 88 | mPhaseOffset = mLatePhaseOffset; |
| 89 | } |
| 90 | } |
| 91 | } |
| 92 | |
| 93 | nsecs_t mLatePhaseOffset = 0; |
| 94 | nsecs_t mEarlyPhaseOffset = 0; |
| 95 | EventThread* mEventThread = nullptr; |
| 96 | std::atomic<nsecs_t> mPhaseOffset = 0; |
| 97 | std::atomic<TransactionStart> mTransactionStart = TransactionStart::NORMAL; |
| 98 | std::atomic<bool> mLastFrameUsedRenderEngine = false; |
| 99 | }; |
| 100 | |
| 101 | } // namespace android |