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c1ce54a82a
Unfortunately, this needed some additional trickery in order to keep its constructor "private". I stole this trick from [1]. With this patch, we tear down the statistics object during XPCOM shutdown intead of after it. I don't believe that we need the object to live past the ClearOnShutdown destructors. [1] http://rienajouter.blogspot.com/2014/10/makeshared-and-makeunique-for-classes.html MozReview-Commit-ID: JsiN6Bq9Yp4 --HG-- extra : rebase_source : dd26c8e6906a6c9fd500c28379f8c63fd7c3ad6a
69 lines
2.2 KiB
C++
69 lines
2.2 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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#include "InputEventStatistics.h"
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#include "nsRefreshDriver.h"
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namespace mozilla {
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TimeDuration
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InputEventStatistics::TimeDurationCircularBuffer::GetMean()
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{
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return mTotal / (int64_t)mSize;
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}
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InputEventStatistics::InputEventStatistics(ConstructorCookie&&)
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: mEnable(false)
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{
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MOZ_ASSERT(Preferences::IsServiceAvailable());
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uint32_t inputDuration =
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Preferences::GetUint("input_event_queue.default_duration_per_event",
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sDefaultInputDuration);
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TimeDuration defaultDuration = TimeDuration::FromMilliseconds(inputDuration);
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uint32_t count =
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Preferences::GetUint("input_event_queue.count_for_prediction",
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sInputCountForPrediction);
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mLastInputDurations =
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MakeUnique<TimeDurationCircularBuffer>(count, defaultDuration);
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uint32_t maxDuration =
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Preferences::GetUint("input_event_queue.duration.max",
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sMaxReservedTimeForHandlingInput);
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uint32_t minDuration =
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Preferences::GetUint("input_event_queue.duration.min",
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sMinReservedTimeForHandlingInput);
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mMaxInputDuration = TimeDuration::FromMilliseconds(maxDuration);
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mMinInputDuration = TimeDuration::FromMilliseconds(minDuration);
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}
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TimeStamp
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InputEventStatistics::GetInputHandlingStartTime(uint32_t aInputCount)
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{
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MOZ_ASSERT(mEnable);
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Maybe<TimeStamp> nextTickHint = nsRefreshDriver::GetNextTickHint();
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if (nextTickHint.isNothing()) {
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// Return a past time to process input events immediately.
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return TimeStamp::Now() - TimeDuration::FromMilliseconds(1);
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}
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TimeDuration inputCost = mLastInputDurations->GetMean() * aInputCount;
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inputCost = inputCost > mMaxInputDuration
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? mMaxInputDuration
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: inputCost < mMinInputDuration
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? mMinInputDuration
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: inputCost;
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return nextTickHint.value() - inputCost;
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}
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} // namespace mozilla
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