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/* -*- 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_PotentialCheckerboardDurationTracker_h
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#define mozilla_layers_PotentialCheckerboardDurationTracker_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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* This class allows the owner to track the duration of time considered
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* "potentially checkerboarding". This is the union of two possibly-intersecting
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* sets of time periods. The first set is that in which checkerboarding was
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* actually happening, since by definition it could potentially be happening.
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* The second set is that in which the APZC is actively transforming content
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* in the compositor, since it could potentially transform it so as to display
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* checkerboarding to the user.
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* The caller of this class calls the appropriate methods to indicate the start
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* and stop of these two sets, and this class manages accumulating the union
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* of the various durations.
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*/
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class PotentialCheckerboardDurationTracker {
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public:
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PotentialCheckerboardDurationTracker();
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/**
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* This should be called if checkerboarding is encountered. It can be called
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* multiple times during a checkerboard event.
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*/
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void CheckerboardSeen();
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/**
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* This should be called when checkerboarding is done. It must have been
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* preceded by one or more calls to CheckerboardSeen().
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*/
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void CheckerboardDone();
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/**
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* This should be called at composition time, to indicate if the APZC is in
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* a transforming state or not.
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*/
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void InTransform(bool aInTransform);
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private:
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bool Tracking() const;
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private:
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bool mInCheckerboard;
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bool mInTransform;
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TimeStamp mCurrentPeriodStart;
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};
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} // namespace layers
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} // namespace mozilla
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#endif // mozilla_layers_PotentialCheckerboardDurationTracker_h