55 lines
1.6 KiB
C++
55 lines
1.6 KiB
C++
/*
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* Copyright 2022 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#pragma once
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#include <memory>
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#include <queue>
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#include <utility>
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#include <scheduler/Time.h>
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namespace android {
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class FenceTime;
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namespace scheduler {
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// Computes composite-to-present latency by tracking recently composited frames pending to present.
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class PresentLatencyTracker {
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public:
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// For tests.
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static constexpr size_t kMaxPendingFrames = 4;
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// Returns the present latency of the latest frame.
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Duration trackPendingFrame(TimePoint compositeTime,
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std::shared_ptr<FenceTime> presentFenceTime);
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private:
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struct PendingFrame {
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PendingFrame(TimePoint compositeTime, std::shared_ptr<FenceTime> presentFenceTime)
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: compositeTime(compositeTime), presentFenceTime(std::move(presentFenceTime)) {}
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const TimePoint compositeTime;
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const std::shared_ptr<FenceTime> presentFenceTime;
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};
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std::queue<PendingFrame> mPendingFrames;
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};
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} // namespace scheduler
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} // namespace android
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