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69 lines
2.5 KiB
C++
69 lines
2.5 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 "mozilla/Preferences.h"
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#include "nsRefreshDriver.h"
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namespace mozilla {
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/*static*/ InputEventStatistics& InputEventStatistics::Get() {
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static UniquePtr<InputEventStatistics> sInstance;
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if (!sInstance) {
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sInstance = MakeUnique<InputEventStatistics>(ConstructorCookie());
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ClearOnShutdown(&sInstance);
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}
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return *sInstance;
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}
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TimeDuration InputEventStatistics::TimeDurationCircularBuffer::GetMean() {
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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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MOZ_ASSERT(Preferences::IsServiceAvailable());
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uint32_t inputDuration = Preferences::GetUint(
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"input_event_queue.default_duration_per_event", sDefaultInputDuration);
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TimeDuration defaultDuration = TimeDuration::FromMilliseconds(inputDuration);
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uint32_t count = Preferences::GetUint(
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"input_event_queue.count_for_prediction", sInputCountForPrediction);
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mLastInputDurations =
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MakeUnique<TimeDurationCircularBuffer>(count, defaultDuration);
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uint32_t maxDuration = Preferences::GetUint("input_event_queue.duration.max",
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sMaxReservedTimeForHandlingInput);
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uint32_t minDuration = 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 InputEventStatistics::GetInputHandlingStartTime(
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uint32_t aInputCount) {
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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 ? mMaxInputDuration
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: inputCost < mMinInputDuration ? 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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