зеркало из https://github.com/mozilla/gecko-dev.git
70 строки
2.2 KiB
C++
70 строки
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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#ifndef mozilla_layers_SampleTime_h
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#define mozilla_layers_SampleTime_h
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#include "mozilla/TimeStamp.h"
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namespace mozilla {
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namespace layers {
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/**
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* When compositing frames, there is usually a "sample time" associated
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* with the frame, which may be derived from vsync or controlled by a test.
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* This class encapsulates that and tracks where the sample time comes from,
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* as the desired behaviour may vary based on the time source.
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*/
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class SampleTime {
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public:
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enum TimeType {
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// Uninitialized sample time.
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eNull,
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// Time comes from a vsync tick, possibly adjusted by a vsync interval.
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eVsync,
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// Time comes from a "now" timestamp
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eNow,
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// Time is set by a test
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eTest,
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};
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SampleTime();
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static SampleTime FromVsync(const TimeStamp& aTime);
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static SampleTime FromNow();
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static SampleTime FromTest(const TimeStamp& aTime);
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bool IsNull() const;
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TimeType Type() const;
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const TimeStamp& Time() const;
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// These operators just compare the timestamps
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bool operator==(const SampleTime& aOther) const;
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bool operator!=(const SampleTime& aOther) const;
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bool operator<(const SampleTime& aOther) const;
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bool operator<=(const SampleTime& aOther) const;
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bool operator>(const SampleTime& aOther) const;
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bool operator>=(const SampleTime& aOther) const;
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// These return a new SampleTime with the same type as this one, but the
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// time adjusted by the provided TimeDuration
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SampleTime operator+(const TimeDuration& aDuration) const;
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SampleTime operator-(const TimeDuration& aDuration) const;
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// This just produces the time difference between the two SampleTimes,
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// ignoring the type.
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TimeDuration operator-(const SampleTime& aOther) const;
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private:
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// Private constructor; use one of the static FromXXX methods instead.
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SampleTime(TimeType aType, const TimeStamp& aTime);
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TimeType mType;
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TimeStamp mTime;
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};
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} // namespace layers
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} // namespace mozilla
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#endif // mozilla_layers_SampleTime_h
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