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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.
*/
#include "config.h"
#include "AnimationFrameRate.h"
#include <wtf/text/TextStream.h>
namespace WebCore {
static constexpr OptionSet<ThrottlingReason> halfSpeedThrottlingReasons { };
FramesPerSecond framesPerSecondNearestFullSpeed(FramesPerSecond nominalFramesPerSecond)
{
if (nominalFramesPerSecond <= FullSpeedFramesPerSecond)
return nominalFramesPerSecond;
float fullSpeedRatio = nominalFramesPerSecond / FullSpeedFramesPerSecond;
FramesPerSecond floorSpeed = nominalFramesPerSecond / std::floor(fullSpeedRatio);
FramesPerSecond ceilSpeed = nominalFramesPerSecond / std::ceil(fullSpeedRatio);
return fullSpeedRatio - std::floor(fullSpeedRatio) <= 0.5 ? floorSpeed : ceilSpeed;
}
std::optional<FramesPerSecond> preferredFramesPerSecond(OptionSet<ThrottlingReason> reasons, std::optional<FramesPerSecond> nominalFramesPerSecond, bool preferFrameRatesNear60FPS)
{
if (reasons.contains(ThrottlingReason::OutsideViewport))
return std::nullopt;
if (!nominalFramesPerSecond || *nominalFramesPerSecond == FullSpeedFramesPerSecond) {
// FIXME: handle ThrottlingReason::VisuallyIdle
if (reasons.containsAny(halfSpeedThrottlingReasons))
return HalfSpeedThrottlingFramesPerSecond;
return FullSpeedFramesPerSecond;
}
auto framesPerSecond = preferFrameRatesNear60FPS ? framesPerSecondNearestFullSpeed(*nominalFramesPerSecond) : *nominalFramesPerSecond;
if (reasons.containsAny(halfSpeedThrottlingReasons))
framesPerSecond /= IntervalThrottlingFactor;
return framesPerSecond;
}
Seconds preferredFrameInterval(OptionSet<ThrottlingReason> reasons, std::optional<FramesPerSecond> nominalFramesPerSecond, bool preferFrameRatesNear60FPS)
{
if (reasons.contains(ThrottlingReason::OutsideViewport))
return AggressiveThrottlingAnimationInterval;
if (!nominalFramesPerSecond || *nominalFramesPerSecond == FullSpeedFramesPerSecond) {
// FIXME: handle ThrottlingReason::VisuallyIdle
if (reasons.containsAny(halfSpeedThrottlingReasons))
return HalfSpeedThrottlingAnimationInterval;
return FullSpeedAnimationInterval;
}
auto framesPerSecond = preferFrameRatesNear60FPS ? framesPerSecondNearestFullSpeed(*nominalFramesPerSecond) : *nominalFramesPerSecond;
auto interval = Seconds(1.0 / framesPerSecond);
if (reasons.containsAny(halfSpeedThrottlingReasons))
interval *= IntervalThrottlingFactor;
return interval;
}
FramesPerSecond preferredFramesPerSecondFromInterval(Seconds preferredFrameInterval)
{
if (preferredFrameInterval == FullSpeedAnimationInterval)
return FullSpeedFramesPerSecond;
if (preferredFrameInterval == HalfSpeedThrottlingAnimationInterval)
return HalfSpeedThrottlingFramesPerSecond;
return std::round(1 / preferredFrameInterval.seconds());
}
TextStream& operator<<(TextStream& ts, const OptionSet<ThrottlingReason>& reasons)
{
bool didAppend = false;
for (auto reason : reasons) {
if (didAppend)
ts << "|";
switch (reason) {
case ThrottlingReason::VisuallyIdle:
ts << "VisuallyIdle";
break;
case ThrottlingReason::OutsideViewport:
ts << "OutsideViewport";
break;
case ThrottlingReason::LowPowerMode:
ts << "LowPowerMode";
break;
case ThrottlingReason::NonInteractedCrossOriginFrame:
ts << "NonInteractiveCrossOriginFrame";
break;
}
didAppend = true;
}
if (reasons.isEmpty())
ts << "[Unthrottled]";
return ts;
}
} // namespace WebCore
|
