mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-01 00:32:11 +00:00
1c6df38b7c
This patch introduces a new way to way to schedule input tasks, such
that input tasks remain at `InputHigh` priority normally, however, when
there's a pending `Vsync` priority task in the task queue, we
increase the priority of input tasks from `InputHigh` to `InputHighest` to
rush processing the pending input tasks.
There are two restrictions to ensure we don't delay vsync too much:
- There's a hard limit duration
- We won't process the input tasks that are newly added after we've
started to process the current number of input tasks
Differential Revision: https://phabricator.services.mozilla.com/D109499
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 -*- */
|
|
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
|
|
/* This Source Code Form is subject to the terms of the Mozilla Public
|
|
* License, v. 2.0. If a copy of the MPL was not distributed with this
|
|
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
|
|
|
|
#if !defined(InputEventStatistics_h_)
|
|
# define InputEventStatistics_h_
|
|
|
|
# include "mozilla/TimeStamp.h"
|
|
# include "mozilla/UniquePtr.h"
|
|
# include "nsTArray.h"
|
|
|
|
namespace mozilla {
|
|
|
|
class InputEventStatistics {
|
|
// The default amount of time (milliseconds) required for handling a input
|
|
// event.
|
|
static const uint16_t sDefaultInputDuration = 1;
|
|
|
|
// The number of processed input events we use to predict the amount of time
|
|
// required to process the following input events.
|
|
static const uint16_t sInputCountForPrediction = 9;
|
|
|
|
// The default maximum and minimum time (milliseconds) we reserve for handling
|
|
// input events in each frame.
|
|
static const uint16_t sMaxReservedTimeForHandlingInput = 8;
|
|
static const uint16_t sMinReservedTimeForHandlingInput = 1;
|
|
|
|
class TimeDurationCircularBuffer {
|
|
int16_t mSize;
|
|
int16_t mCurrentIndex;
|
|
nsTArray<TimeDuration> mBuffer;
|
|
TimeDuration mTotal;
|
|
|
|
public:
|
|
TimeDurationCircularBuffer(uint32_t aSize, TimeDuration& aDefaultValue)
|
|
: mSize(aSize), mCurrentIndex(0) {
|
|
mSize = mSize == 0 ? sInputCountForPrediction : mSize;
|
|
for (int16_t index = 0; index < mSize; ++index) {
|
|
mBuffer.AppendElement(aDefaultValue);
|
|
mTotal += aDefaultValue;
|
|
}
|
|
}
|
|
|
|
void Insert(TimeDuration& aDuration) {
|
|
mTotal += (aDuration - mBuffer[mCurrentIndex]);
|
|
mBuffer[mCurrentIndex++] = aDuration;
|
|
if (mCurrentIndex == mSize) {
|
|
mCurrentIndex = 0;
|
|
}
|
|
}
|
|
|
|
TimeDuration GetMean();
|
|
};
|
|
|
|
UniquePtr<TimeDurationCircularBuffer> mLastInputDurations;
|
|
TimeDuration mMaxInputDuration;
|
|
TimeDuration mMinInputDuration;
|
|
bool mEnable;
|
|
|
|
// We'd like to have our constructor and destructor be private to enforce our
|
|
// singleton, but because UniquePtr needs to be able to destruct our class we
|
|
// can't. This is a trick that ensures that we're the only code that can
|
|
// construct ourselves: nobody else can access ConstructorCookie and therefore
|
|
// nobody else can construct an InputEventStatistics.
|
|
struct ConstructorCookie {};
|
|
|
|
public:
|
|
explicit InputEventStatistics(ConstructorCookie&&);
|
|
~InputEventStatistics() = default;
|
|
|
|
static InputEventStatistics& Get();
|
|
|
|
void UpdateInputDuration(TimeDuration aDuration) {
|
|
if (!mEnable) {
|
|
return;
|
|
}
|
|
mLastInputDurations->Insert(aDuration);
|
|
}
|
|
|
|
TimeStamp GetInputHandlingStartTime(uint32_t aInputCount);
|
|
TimeDuration GetMaxInputHandlingDuration() const;
|
|
|
|
void SetEnable(bool aEnable) { mEnable = aEnable; }
|
|
};
|
|
|
|
class MOZ_RAII AutoTimeDurationHelper final {
|
|
public:
|
|
AutoTimeDurationHelper() { mStartTime = TimeStamp::Now(); }
|
|
|
|
~AutoTimeDurationHelper() {
|
|
InputEventStatistics::Get().UpdateInputDuration(TimeStamp::Now() -
|
|
mStartTime);
|
|
}
|
|
|
|
private:
|
|
TimeStamp mStartTime;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif // InputEventStatistics_h_
|