61 lines
2.1 KiB
C++
61 lines
2.1 KiB
C++
/*
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* Copyright (C) 2020 Apple Inc. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
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* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
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* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
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* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
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* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
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* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
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* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#pragma once
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#include <wtf/Deque.h>
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#include <wtf/Function.h>
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#include <wtf/MonotonicTime.h>
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namespace WebCore {
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class FrameRateMonitor {
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public:
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struct LateFrameInfo {
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MonotonicTime frameTime;
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MonotonicTime lastFrameTime;
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};
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using LateFrameCallback = Function<void(LateFrameInfo)>;
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explicit FrameRateMonitor(LateFrameCallback&&);
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void update();
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double observedFrameRate() const { return m_observedFrameRate; }
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size_t frameCount() const { return m_frameCount; }
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private:
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LateFrameCallback m_lateFrameCallback;
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Deque<double, 120> m_observedFrameTimeStamps;
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double m_observedFrameRate { 0 };
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uint64_t m_frameCount { 0 };
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};
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inline FrameRateMonitor::FrameRateMonitor(LateFrameCallback&& callback)
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: m_lateFrameCallback(WTFMove(callback))
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{
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}
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}
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