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/*
* Copyright (C) 2021 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"
namespace WTF {
class TextStream;
}
namespace WebCore {
// Used to represent a given update. An value of { 3, 60 } indicates that this is the third update in a 1-second interval
// on a 60fps cadence. updateIndex will reset to zero every second, so { 59, 60 } is followed by { 0, 60 }.
struct DisplayUpdate {
unsigned updateIndex { 0 };
FramesPerSecond updatesPerSecond { 0 };
DisplayUpdate nextUpdate() const
{
return { (updateIndex + 1) % updatesPerSecond, updatesPerSecond };
}
WEBCORE_EXPORT bool relevantForUpdateFrequency(FramesPerSecond) const;
template<class Encoder> void encode(Encoder&) const;
template<class Decoder> static std::optional<DisplayUpdate> decode(Decoder&);
};
template<class Encoder>
void DisplayUpdate::encode(Encoder& encoder) const
{
encoder << updateIndex;
encoder << updatesPerSecond;
}
template<class Decoder>
std::optional<DisplayUpdate> DisplayUpdate::decode(Decoder& decoder)
{
std::optional<unsigned> updateIndex;
decoder >> updateIndex;
if (!updateIndex)
return std::nullopt;
std::optional<FramesPerSecond> updatesPerSecond;
decoder >> updatesPerSecond;
if (!updatesPerSecond)
return std::nullopt;
return {{ *updateIndex, *updatesPerSecond }};
}
WEBCORE_EXPORT WTF::TextStream& operator<<(WTF::TextStream&, const DisplayUpdate&);
} // namespace WebCore
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