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