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