128 lines
5.0 KiB
C++
128 lines
5.0 KiB
C++
/*
|
|
* 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 { ThrottlingReason::LowPowerMode, ThrottlingReason::NonInteractedCrossOriginFrame, ThrottlingReason::VisuallyIdle };
|
|
|
|
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
|