forked from mirrors/gecko-dev
30984f7bab
Differential Revision: https://phabricator.services.mozilla.com/D62543 --HG-- extra : moz-landing-system : lando
104 lines
3.2 KiB
C++
104 lines
3.2 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#if !defined(InputEventStatistics_h_)
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# define InputEventStatistics_h_
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# include "mozilla/ClearOnShutdown.h"
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# include "mozilla/Maybe.h"
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# include "mozilla/Preferences.h"
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# include "mozilla/TimeStamp.h"
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# include "nsTArray.h"
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namespace mozilla {
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class InputEventStatistics {
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// The default amount of time (milliseconds) required for handling a input
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// event.
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static const uint16_t sDefaultInputDuration = 1;
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// The number of processed input events we use to predict the amount of time
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// required to process the following input events.
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static const uint16_t sInputCountForPrediction = 9;
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// The default maximum and minimum time (milliseconds) we reserve for handling
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// input events in each frame.
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static const uint16_t sMaxReservedTimeForHandlingInput = 8;
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static const uint16_t sMinReservedTimeForHandlingInput = 1;
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class TimeDurationCircularBuffer {
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int16_t mSize;
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int16_t mCurrentIndex;
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nsTArray<TimeDuration> mBuffer;
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TimeDuration mTotal;
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public:
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TimeDurationCircularBuffer(uint32_t aSize, TimeDuration& aDefaultValue)
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: mSize(aSize), mCurrentIndex(0) {
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mSize = mSize == 0 ? sInputCountForPrediction : mSize;
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for (int16_t index = 0; index < mSize; ++index) {
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mBuffer.AppendElement(aDefaultValue);
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mTotal += aDefaultValue;
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}
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}
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void Insert(TimeDuration& aDuration) {
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mTotal += (aDuration - mBuffer[mCurrentIndex]);
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mBuffer[mCurrentIndex++] = aDuration;
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if (mCurrentIndex == mSize) {
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mCurrentIndex = 0;
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}
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}
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TimeDuration GetMean();
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};
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UniquePtr<TimeDurationCircularBuffer> mLastInputDurations;
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TimeDuration mMaxInputDuration;
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TimeDuration mMinInputDuration;
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bool mEnable;
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// We'd like to have our constructor and destructor be private to enforce our
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// singleton, but because UniquePtr needs to be able to destruct our class we
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// can't. This is a trick that ensures that we're the only code that can
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// construct ourselves: nobody else can access ConstructorCookie and therefore
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// nobody else can construct an InputEventStatistics.
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struct ConstructorCookie {};
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public:
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explicit InputEventStatistics(ConstructorCookie&&);
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~InputEventStatistics() = default;
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static InputEventStatistics& Get();
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void UpdateInputDuration(TimeDuration aDuration) {
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if (!mEnable) {
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return;
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}
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mLastInputDurations->Insert(aDuration);
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}
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TimeStamp GetInputHandlingStartTime(uint32_t aInputCount);
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void SetEnable(bool aEnable) { mEnable = aEnable; }
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};
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class MOZ_RAII AutoTimeDurationHelper final {
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public:
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AutoTimeDurationHelper() { mStartTime = TimeStamp::Now(); }
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~AutoTimeDurationHelper() {
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InputEventStatistics::Get().UpdateInputDuration(TimeStamp::Now() -
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mStartTime);
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}
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private:
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TimeStamp mStartTime;
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};
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} // namespace mozilla
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#endif // InputEventStatistics_h_
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