From 9e3c08db40b8916968b9f30096c7be3f00ce9647 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sun, 21 Apr 2024 13:44:51 +0200 Subject: Adding upstream version 1:115.7.0. Signed-off-by: Daniel Baumann --- gfx/layers/SampleTime.h | 69 +++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 69 insertions(+) create mode 100644 gfx/layers/SampleTime.h (limited to 'gfx/layers/SampleTime.h') diff --git a/gfx/layers/SampleTime.h b/gfx/layers/SampleTime.h new file mode 100644 index 0000000000..a32f758eb7 --- /dev/null +++ b/gfx/layers/SampleTime.h @@ -0,0 +1,69 @@ +/* -*- 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/. */ + +#ifndef mozilla_layers_SampleTime_h +#define mozilla_layers_SampleTime_h + +#include "mozilla/TimeStamp.h" + +namespace mozilla { +namespace layers { + +/** + * When compositing frames, there is usually a "sample time" associated + * with the frame, which may be derived from vsync or controlled by a test. + * This class encapsulates that and tracks where the sample time comes from, + * as the desired behaviour may vary based on the time source. + */ +class SampleTime { + public: + enum TimeType { + // Uninitialized sample time. + eNull, + // Time comes from a vsync tick, possibly adjusted by a vsync interval. + eVsync, + // Time comes from a "now" timestamp + eNow, + // Time is set by a test + eTest, + }; + + SampleTime(); + static SampleTime FromVsync(const TimeStamp& aTime); + static SampleTime FromNow(); + static SampleTime FromTest(const TimeStamp& aTime); + + bool IsNull() const; + TimeType Type() const; + const TimeStamp& Time() const; + + // These operators just compare the timestamps + bool operator==(const SampleTime& aOther) const; + bool operator!=(const SampleTime& aOther) const; + bool operator<(const SampleTime& aOther) const; + bool operator<=(const SampleTime& aOther) const; + bool operator>(const SampleTime& aOther) const; + bool operator>=(const SampleTime& aOther) const; + // These return a new SampleTime with the same type as this one, but the + // time adjusted by the provided TimeDuration + SampleTime operator+(const TimeDuration& aDuration) const; + SampleTime operator-(const TimeDuration& aDuration) const; + // This just produces the time difference between the two SampleTimes, + // ignoring the type. + TimeDuration operator-(const SampleTime& aOther) const; + + private: + // Private constructor; use one of the static FromXXX methods instead. + SampleTime(TimeType aType, const TimeStamp& aTime); + + TimeType mType; + TimeStamp mTime; +}; + +} // namespace layers +} // namespace mozilla + +#endif // mozilla_layers_SampleTime_h -- cgit v1.2.3