gecko/dom/animation/AnimationTimeline.cpp

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/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
/* 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 "AnimationTimeline.h"
#include "mozilla/dom/AnimationTimelineBinding.h"
#include "nsContentUtils.h"
#include "nsIPresShell.h"
#include "nsPresContext.h"
#include "nsRefreshDriver.h"
#include "nsDOMNavigationTiming.h"
namespace mozilla {
namespace dom {
NS_IMPL_CYCLE_COLLECTION_WRAPPERCACHE(AnimationTimeline, mDocument)
NS_IMPL_CYCLE_COLLECTION_ROOT_NATIVE(AnimationTimeline, AddRef)
NS_IMPL_CYCLE_COLLECTION_UNROOT_NATIVE(AnimationTimeline, Release)
JSObject*
AnimationTimeline::WrapObject(JSContext* aCx)
{
return AnimationTimelineBinding::Wrap(aCx, this);
}
Nullable<double>
AnimationTimeline::GetCurrentTime() const
{
return ToTimelineTime(GetCurrentTimeStamp());
}
TimeStamp
AnimationTimeline::GetCurrentTimeStamp() const
{
// Always return the same object to benefit from return-value optimization.
TimeStamp result = mLastCurrentTime;
// If we've never been sampled, initialize the current time to the timeline's
// zero time since that is the time we'll use if we don't have a refresh
// driver.
if (result.IsNull()) {
nsRefPtr<nsDOMNavigationTiming> timing = mDocument->GetNavigationTiming();
if (!timing) {
return result;
}
result = timing->GetNavigationStartTimeStamp();
}
nsIPresShell* presShell = mDocument->GetShell();
if (MOZ_UNLIKELY(!presShell)) {
return result;
}
nsPresContext* presContext = presShell->GetPresContext();
if (MOZ_UNLIKELY(!presContext)) {
return result;
}
result = presContext->RefreshDriver()->MostRecentRefresh();
// FIXME: We would like to assert that:
// mLastCurrentTime.IsNull() || result >= mLastCurrentTime
// but due to bug 1043078 this will not be the case when the refresh driver
// is restored from test control.
mLastCurrentTime = result;
return result;
}
Nullable<double>
AnimationTimeline::ToTimelineTime(const mozilla::TimeStamp& aTimeStamp) const
{
Nullable<double> result; // Initializes to null
if (aTimeStamp.IsNull()) {
return result;
}
nsRefPtr<nsDOMNavigationTiming> timing = mDocument->GetNavigationTiming();
if (MOZ_UNLIKELY(!timing)) {
return result;
}
result.SetValue(timing->TimeStampToDOMHighRes(aTimeStamp));
return result;
}
} // namespace dom
} // namespace mozilla