From 26a029d407be480d791972afb5975cf62c9360a6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Fri, 19 Apr 2024 02:47:55 +0200 Subject: Adding upstream version 124.0.1. Signed-off-by: Daniel Baumann --- dom/smil/SMILTimeContainer.cpp | 306 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 306 insertions(+) create mode 100644 dom/smil/SMILTimeContainer.cpp (limited to 'dom/smil/SMILTimeContainer.cpp') diff --git a/dom/smil/SMILTimeContainer.cpp b/dom/smil/SMILTimeContainer.cpp new file mode 100644 index 0000000000..321c27ed2c --- /dev/null +++ b/dom/smil/SMILTimeContainer.cpp @@ -0,0 +1,306 @@ +/* -*- 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 + +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(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 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(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(now) - mParentOffset; + mCurrentTime = updatedCurrentTime.isValid() + ? updatedCurrentTime.value() + : std::numeric_limits::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> elems; + + { +#ifdef DEBUG + AutoRestore 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 -- cgit v1.2.3