blob: 9bd5dc65c54a4ff12436f34ed7343d4380cba8fe [file] [log] [blame]
/*
* Copyright (C) 2022 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 "AnimationFrameRate.h"
#include "ReducedResolutionSeconds.h"
#include <wtf/HashMap.h>
#include <wtf/Seconds.h>
namespace WebCore {
class FrameRateAligner {
WTF_MAKE_FAST_ALLOCATED;
public:
explicit FrameRateAligner();
~FrameRateAligner();
void beginUpdate(ReducedResolutionSeconds, std::optional<FramesPerSecond>);
void finishUpdate();
enum class ShouldUpdate { Yes, No };
ShouldUpdate updateFrameRate(FramesPerSecond);
std::optional<Seconds> timeUntilNextUpdateForFrameRate(FramesPerSecond, ReducedResolutionSeconds) const;
std::optional<FramesPerSecond> maximumFrameRate() const;
private:
struct FrameRateData {
ReducedResolutionSeconds firstUpdateTime;
ReducedResolutionSeconds lastUpdateTime;
bool isNew { true };
};
HashMap<FramesPerSecond, FrameRateData> m_frameRates;
ReducedResolutionSeconds m_timestamp;
};
} // namespace WebCore