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diff --git a/dom/smil/SMILTimeContainer.cpp b/dom/smil/SMILTimeContainer.cpp
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+/* -*- 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/. */
+
+#include "SMILTimeContainer.h"
+
+#include "mozilla/AutoRestore.h"
+#include "mozilla/CheckedInt.h"
+#include "mozilla/SMILTimedElement.h"
+#include "mozilla/SMILTimeValue.h"
+#include <algorithm>
+
+namespace mozilla {
+
+SMILTimeContainer::SMILTimeContainer()
+ : mParent(nullptr),
+ mCurrentTime(0L),
+ mParentOffset(0L),
+ mPauseStart(0L),
+ mNeedsPauseSample(false),
+ mNeedsRewind(false),
+ mIsSeeking(false),
+#ifdef DEBUG
+ mHoldingEntries(false),
+#endif
+ mPauseState(PAUSE_BEGIN) {
+}
+
+SMILTimeContainer::~SMILTimeContainer() {
+ if (mParent) {
+ mParent->RemoveChild(*this);
+ }
+}
+
+SMILTimeValue SMILTimeContainer::ContainerToParentTime(
+ SMILTime aContainerTime) const {
+ // If we're paused, then future times are indefinite
+ if (IsPaused() && aContainerTime > mCurrentTime)
+ return SMILTimeValue::Indefinite();
+
+ return SMILTimeValue(aContainerTime + mParentOffset);
+}
+
+SMILTimeValue SMILTimeContainer::ParentToContainerTime(
+ SMILTime aParentTime) const {
+ // If we're paused, then any time after when we paused is indefinite
+ if (IsPaused() && aParentTime > mPauseStart)
+ return SMILTimeValue::Indefinite();
+
+ return SMILTimeValue(aParentTime - mParentOffset);
+}
+
+void SMILTimeContainer::Begin() {
+ Resume(PAUSE_BEGIN);
+ if (mPauseState) {
+ mNeedsPauseSample = true;
+ }
+
+ // This is a little bit complicated here. Ideally we'd just like to call
+ // Sample() and force an initial sample but this turns out to be a bad idea
+ // because this may mean that NeedsSample() no longer reports true and so when
+ // we come to the first real sample our parent will skip us over altogether.
+ // So we force the time to be updated and adopt the policy to never call
+ // Sample() ourselves but to always leave that to our parent or client.
+
+ UpdateCurrentTime();
+}
+
+void SMILTimeContainer::Pause(uint32_t aType) {
+ bool didStartPause = false;
+
+ if (!mPauseState && aType) {
+ mPauseStart = GetParentTime();
+ mNeedsPauseSample = true;
+ didStartPause = true;
+ }
+
+ mPauseState |= aType;
+
+ if (didStartPause) {
+ NotifyTimeChange();
+ }
+}
+
+void SMILTimeContainer::Resume(uint32_t aType) {
+ if (!mPauseState) return;
+
+ mPauseState &= ~aType;
+
+ if (!mPauseState) {
+ SMILTime extraOffset = GetParentTime() - mPauseStart;
+ mParentOffset += extraOffset;
+ NotifyTimeChange();
+ }
+}
+
+SMILTime SMILTimeContainer::GetCurrentTimeAsSMILTime() const {
+ // The following behaviour is consistent with:
+ // http://www.w3.org/2003/01/REC-SVG11-20030114-errata
+ // #getCurrentTime_setCurrentTime_undefined_before_document_timeline_begin
+ // which says that if GetCurrentTime is called before the document timeline
+ // has begun we should just return 0.
+ if (IsPausedByType(PAUSE_BEGIN)) return 0L;
+
+ return mCurrentTime;
+}
+
+void SMILTimeContainer::SetCurrentTime(SMILTime aSeekTo) {
+ // SVG 1.1 doesn't specify what to do for negative times so we adopt SVGT1.2's
+ // behaviour of clamping negative times to 0.
+ aSeekTo = std::max<SMILTime>(0, aSeekTo);
+
+ // The following behaviour is consistent with:
+ // http://www.w3.org/2003/01/REC-SVG11-20030114-errata
+ // #getCurrentTime_setCurrentTime_undefined_before_document_timeline_begin
+ // which says that if SetCurrentTime is called before the document timeline
+ // has begun we should still adjust the offset.
+ SMILTime parentTime = GetParentTime();
+ mParentOffset = parentTime - aSeekTo;
+ mIsSeeking = true;
+
+ if (IsPaused()) {
+ mNeedsPauseSample = true;
+ mPauseStart = parentTime;
+ }
+
+ if (aSeekTo < mCurrentTime) {
+ // Backwards seek
+ mNeedsRewind = true;
+ ClearMilestones();
+ }
+
+ // Force an update to the current time in case we get a call to GetCurrentTime
+ // before another call to Sample().
+ UpdateCurrentTime();
+
+ NotifyTimeChange();
+}
+
+SMILTime SMILTimeContainer::GetParentTime() const {
+ if (mParent) return mParent->GetCurrentTimeAsSMILTime();
+
+ return 0L;
+}
+
+void SMILTimeContainer::SyncPauseTime() {
+ if (IsPaused()) {
+ SMILTime parentTime = GetParentTime();
+ SMILTime extraOffset = parentTime - mPauseStart;
+ mParentOffset += extraOffset;
+ mPauseStart = parentTime;
+ }
+}
+
+void SMILTimeContainer::Sample() {
+ if (!NeedsSample()) return;
+
+ UpdateCurrentTime();
+ DoSample();
+
+ mNeedsPauseSample = false;
+}
+
+nsresult SMILTimeContainer::SetParent(SMILTimeContainer* aParent) {
+ if (mParent) {
+ mParent->RemoveChild(*this);
+ // When we're not attached to a parent time container, GetParentTime() will
+ // return 0. We need to adjust our pause state information to be relative to
+ // this new time base.
+ // Note that since "current time = parent time - parent offset" setting the
+ // parent offset and pause start as follows preserves our current time even
+ // while parent time = 0.
+ mParentOffset = -mCurrentTime;
+ mPauseStart = 0L;
+ }
+
+ mParent = aParent;
+
+ nsresult rv = NS_OK;
+ if (mParent) {
+ rv = mParent->AddChild(*this);
+ }
+
+ return rv;
+}
+
+void SMILTimeContainer::AddMilestone(
+ const SMILMilestone& aMilestone,
+ mozilla::dom::SVGAnimationElement& aElement) {
+ // We record the milestone time and store it along with the element but this
+ // time may change (e.g. if attributes are changed on the timed element in
+ // between samples). If this happens, then we may do an unecessary sample
+ // but that's pretty cheap.
+ MOZ_ASSERT(!mHoldingEntries);
+ mMilestoneEntries.Push(MilestoneEntry(aMilestone, aElement));
+}
+
+void SMILTimeContainer::ClearMilestones() {
+ MOZ_ASSERT(!mHoldingEntries);
+ mMilestoneEntries.Clear();
+}
+
+bool SMILTimeContainer::GetNextMilestoneInParentTime(
+ SMILMilestone& aNextMilestone) const {
+ if (mMilestoneEntries.IsEmpty()) return false;
+
+ SMILTimeValue parentTime =
+ ContainerToParentTime(mMilestoneEntries.Top().mMilestone.mTime);
+ if (!parentTime.IsDefinite()) return false;
+
+ aNextMilestone = SMILMilestone(parentTime.GetMillis(),
+ mMilestoneEntries.Top().mMilestone.mIsEnd);
+
+ return true;
+}
+
+bool SMILTimeContainer::PopMilestoneElementsAtMilestone(
+ const SMILMilestone& aMilestone, AnimElemArray& aMatchedElements) {
+ if (mMilestoneEntries.IsEmpty()) return false;
+
+ SMILTimeValue containerTime = ParentToContainerTime(aMilestone.mTime);
+ if (!containerTime.IsDefinite()) return false;
+
+ SMILMilestone containerMilestone(containerTime.GetMillis(),
+ aMilestone.mIsEnd);
+
+ MOZ_ASSERT(mMilestoneEntries.Top().mMilestone >= containerMilestone,
+ "Trying to pop off earliest times but we have earlier ones that "
+ "were overlooked");
+
+ MOZ_ASSERT(!mHoldingEntries);
+
+ bool gotOne = false;
+ while (!mMilestoneEntries.IsEmpty() &&
+ mMilestoneEntries.Top().mMilestone == containerMilestone) {
+ aMatchedElements.AppendElement(mMilestoneEntries.Pop().mTimebase);
+ gotOne = true;
+ }
+
+ return gotOne;
+}
+
+void SMILTimeContainer::Traverse(
+ nsCycleCollectionTraversalCallback* aCallback) {
+#ifdef DEBUG
+ AutoRestore<bool> saveHolding(mHoldingEntries);
+ mHoldingEntries = true;
+#endif
+ const MilestoneEntry* p = mMilestoneEntries.Elements();
+ while (p < mMilestoneEntries.Elements() + mMilestoneEntries.Length()) {
+ NS_CYCLE_COLLECTION_NOTE_EDGE_NAME(*aCallback, "mTimebase");
+ aCallback->NoteXPCOMChild(static_cast<nsIContent*>(p->mTimebase.get()));
+ ++p;
+ }
+}
+
+void SMILTimeContainer::Unlink() {
+ MOZ_ASSERT(!mHoldingEntries);
+ mMilestoneEntries.Clear();
+}
+
+void SMILTimeContainer::UpdateCurrentTime() {
+ SMILTime now = IsPaused() ? mPauseStart : GetParentTime();
+ MOZ_ASSERT(now >= mParentOffset,
+ "Container has negative time with respect to parent");
+ const auto updatedCurrentTime = CheckedInt<SMILTime>(now) - mParentOffset;
+ mCurrentTime = updatedCurrentTime.isValid()
+ ? updatedCurrentTime.value()
+ : std::numeric_limits<SMILTime>::max();
+}
+
+void SMILTimeContainer::NotifyTimeChange() {
+ // Called when the container time is changed with respect to the document
+ // time. When this happens time dependencies in other time containers need to
+ // re-resolve their times because begin and end times are stored in container
+ // time.
+ //
+ // To get the list of timed elements with dependencies we simply re-use the
+ // milestone elements. This is because any timed element with dependents and
+ // with significant transitions yet to fire should have their next milestone
+ // registered. Other timed elements don't matter.
+
+ // Copy the timed elements to a separate array before calling
+ // HandleContainerTimeChange on each of them in case doing so mutates
+ // mMilestoneEntries.
+ nsTArray<RefPtr<mozilla::dom::SVGAnimationElement>> elems;
+
+ {
+#ifdef DEBUG
+ AutoRestore<bool> saveHolding(mHoldingEntries);
+ mHoldingEntries = true;
+#endif
+ for (const MilestoneEntry* p = mMilestoneEntries.Elements();
+ p < mMilestoneEntries.Elements() + mMilestoneEntries.Length(); ++p) {
+ elems.AppendElement(p->mTimebase.get());
+ }
+ }
+
+ for (auto& elem : elems) {
+ elem->TimedElement().HandleContainerTimeChange();
+ }
+}
+
+} // namespace mozilla