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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set sw=2 ts=8 et 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/. */
#include "PotentialCheckerboardDurationTracker.h"
namespace mozilla {
namespace layers {
PotentialCheckerboardDurationTracker::PotentialCheckerboardDurationTracker()
: mInCheckerboard(false)
, mInTransform(false)
{
}
void
PotentialCheckerboardDurationTracker::CheckerboardSeen()
{
mInCheckerboard = true;
}
void
PotentialCheckerboardDurationTracker::CheckerboardDone()
{
MOZ_ASSERT(Tracking());
mInCheckerboard = false;
}
void
PotentialCheckerboardDurationTracker::InTransform(bool aInTransform)
{
if (aInTransform == mInTransform) {
// no-op
return;
}
if (!Tracking()) {
// Because !Tracking(), mInTransform must be false, and so aInTransform
// must be true (or we would have early-exited this function already).
// Therefore, we are starting a potential checkerboard period.
mInTransform = aInTransform;
return;
}
mInTransform = aInTransform;
}
bool
PotentialCheckerboardDurationTracker::Tracking() const
{
return mInTransform || mInCheckerboard;
}
} // namespace layers
} // namespace mozilla
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