The Tor Browser: comparison dom/smil/nsSMILTimeContainer.cpp

--1:000000000000
+:6b1638407a8f
+/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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 "nsSMILTimeContainer.h"
+#include "nsSMILTimeValue.h"
+#include "nsSMILTimedElement.h"
+#include <algorithm>
+nsSMILTimeContainer::nsSMILTimeContainer()
+:
+mParent(nullptr),
+mCurrentTime(0L),
+mParentOffset(0L),
+mPauseStart(0L),
+mNeedsPauseSample(false),
+mNeedsRewind(false),
+mIsSeeking(false),
+mPauseState(PAUSE_BEGIN)
+{
+}
+nsSMILTimeContainer::~nsSMILTimeContainer()
+{
+if (mParent) {
+mParent->RemoveChild(*this);
+}
+}
+nsSMILTimeValue
+nsSMILTimeContainer::ContainerToParentTime(nsSMILTime aContainerTime) const
+{
+// If we're paused, then future times are indefinite
+if (IsPaused() && aContainerTime > mCurrentTime)
+return nsSMILTimeValue::Indefinite();
+return nsSMILTimeValue(aContainerTime + mParentOffset);
+}
+nsSMILTimeValue
+nsSMILTimeContainer::ParentToContainerTime(nsSMILTime aParentTime) const
+{
+// If we're paused, then any time after when we paused is indefinite
+if (IsPaused() && aParentTime > mPauseStart)
+return nsSMILTimeValue::Indefinite();
+return nsSMILTimeValue(aParentTime - mParentOffset);
+}
+void
+nsSMILTimeContainer::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
+nsSMILTimeContainer::Pause(uint32_t aType)
+{
+bool didStartPause = false;
+if (!mPauseState && aType) {
+mPauseStart = GetParentTime();
+mNeedsPauseSample = true;
+didStartPause = true;
+}
+mPauseState |= aType;
+if (didStartPause) {
+NotifyTimeChange();
+}
+}
+void
+nsSMILTimeContainer::Resume(uint32_t aType)
+{
+if (!mPauseState)
+return;
+mPauseState &= ~aType;
+if (!mPauseState) {
+nsSMILTime extraOffset = GetParentTime() - mPauseStart;
+mParentOffset += extraOffset;
+NotifyTimeChange();
+}
+}
+nsSMILTime
+nsSMILTimeContainer::GetCurrentTime() 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
+nsSMILTimeContainer::SetCurrentTime(nsSMILTime 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<nsSMILTime>(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.
+nsSMILTime 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();
+}
+nsSMILTime
+nsSMILTimeContainer::GetParentTime() const
+{
+if (mParent)
+return mParent->GetCurrentTime();
+return 0L;
+}
+void
+nsSMILTimeContainer::SyncPauseTime()
+{
+if (IsPaused()) {
+nsSMILTime parentTime = GetParentTime();
+nsSMILTime extraOffset = parentTime - mPauseStart;
+mParentOffset += extraOffset;
+mPauseStart = parentTime;
+}
+}
+void
+nsSMILTimeContainer::Sample()
+{
+if (!NeedsSample())
+return;
+UpdateCurrentTime();
+DoSample();
+mNeedsPauseSample = false;
+}
+nsresult
+nsSMILTimeContainer::SetParent(nsSMILTimeContainer* 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;
+}
+bool
+nsSMILTimeContainer::AddMilestone(const nsSMILMilestone& 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.
+return mMilestoneEntries.Push(MilestoneEntry(aMilestone, aElement));
+}
+void
+nsSMILTimeContainer::ClearMilestones()
+{
+mMilestoneEntries.Clear();
+}
+bool
+nsSMILTimeContainer::GetNextMilestoneInParentTime(
+nsSMILMilestone& aNextMilestone) const
+{
+if (mMilestoneEntries.IsEmpty())
+return false;
+nsSMILTimeValue parentTime =
+ContainerToParentTime(mMilestoneEntries.Top().mMilestone.mTime);
+if (!parentTime.IsDefinite())
+return false;
+aNextMilestone = nsSMILMilestone(parentTime.GetMillis(),
+mMilestoneEntries.Top().mMilestone.mIsEnd);
+return true;
+}
+bool
+nsSMILTimeContainer::PopMilestoneElementsAtMilestone(
+const nsSMILMilestone& aMilestone,
+AnimElemArray& aMatchedElements)
+{
+if (mMilestoneEntries.IsEmpty())
+return false;
+nsSMILTimeValue containerTime = ParentToContainerTime(aMilestone.mTime);
+if (!containerTime.IsDefinite())
+return false;
+nsSMILMilestone containerMilestone(containerTime.GetMillis(),
+aMilestone.mIsEnd);
+NS_ABORT_IF_FALSE(mMilestoneEntries.Top().mMilestone >= containerMilestone,
+"Trying to pop off earliest times but we have earlier ones that were "
+"overlooked");
+bool gotOne = false;
+while (!mMilestoneEntries.IsEmpty() &&
+mMilestoneEntries.Top().mMilestone == containerMilestone)
+{
+aMatchedElements.AppendElement(mMilestoneEntries.Pop().mTimebase);
+gotOne = true;
+}
+return gotOne;
+}
+void
+nsSMILTimeContainer::Traverse(nsCycleCollectionTraversalCallback* aCallback)
+{
+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
+nsSMILTimeContainer::Unlink()
+{
+mMilestoneEntries.Clear();
+}
+void
+nsSMILTimeContainer::UpdateCurrentTime()
+{
+nsSMILTime now = IsPaused() ? mPauseStart : GetParentTime();
+mCurrentTime = now - mParentOffset;
+NS_ABORT_IF_FALSE(mCurrentTime >= 0, "Container has negative time");
+}
+void
+nsSMILTimeContainer::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.
+const MilestoneEntry* p = mMilestoneEntries.Elements();
+#if DEBUG
+uint32_t queueLength = mMilestoneEntries.Length();
+#endif
+while (p < mMilestoneEntries.Elements() + mMilestoneEntries.Length()) {
+mozilla::dom::SVGAnimationElement* elem = p->mTimebase.get();
+elem->TimedElement().HandleContainerTimeChange();
+NS_ABORT_IF_FALSE(queueLength == mMilestoneEntries.Length(),
+"Call to HandleContainerTimeChange resulted in a change to the "
+"queue of milestones");
+++p;
+}
+}

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comparison: dom/smil/nsSMILTimeContainer.cpp

dom/smil/nsSMILTimeContainer.cpp