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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/. */
+
+#ifndef DOM_SMIL_SMILTIMEDELEMENT_H_
+#define DOM_SMIL_SMILTIMEDELEMENT_H_
+
+#include <utility>
+
+#include "mozilla/EventForwards.h"
+#include "mozilla/SMILInstanceTime.h"
+#include "mozilla/SMILInterval.h"
+#include "mozilla/SMILMilestone.h"
+#include "mozilla/SMILRepeatCount.h"
+#include "mozilla/SMILTimeValueSpec.h"
+#include "mozilla/SMILTypes.h"
+#include "mozilla/UniquePtr.h"
+#include "nsAttrValue.h"
+#include "nsHashKeys.h"
+#include "nsTArray.h"
+#include "nsTHashtable.h"
+
+class nsAtom;
+
+namespace mozilla {
+
+class SMILAnimationFunction;
+class SMILTimeContainer;
+class SMILTimeValue;
+
+namespace dom {
+class SVGAnimationElement;
+} // namespace dom
+
+//----------------------------------------------------------------------
+// SMILTimedElement
+
+class SMILTimedElement {
+ public:
+ SMILTimedElement();
+ ~SMILTimedElement();
+
+ using Element = dom::Element;
+
+ /*
+ * Sets the owning animation element which this class uses to convert between
+ * container times and to register timebase elements.
+ */
+ void SetAnimationElement(mozilla::dom::SVGAnimationElement* aElement);
+
+ /*
+ * Returns the time container with which this timed element is associated or
+ * nullptr if it is not associated with a time container.
+ */
+ SMILTimeContainer* GetTimeContainer();
+
+ /*
+ * Returns the element targeted by the animation element. Needed for
+ * registering event listeners against the appropriate element.
+ */
+ Element* GetTargetElement();
+
+ /**
+ * Methods for supporting the ElementTimeControl interface.
+ */
+
+ /*
+ * Adds a new begin instance time at the current container time plus or minus
+ * the specified offset.
+ *
+ * @param aOffsetSeconds A real number specifying the number of seconds to add
+ * to the current container time.
+ * @return NS_OK if the operation succeeeded, or an error code otherwise.
+ */
+ nsresult BeginElementAt(double aOffsetSeconds);
+
+ /*
+ * Adds a new end instance time at the current container time plus or minus
+ * the specified offset.
+ *
+ * @param aOffsetSeconds A real number specifying the number of seconds to add
+ * to the current container time.
+ * @return NS_OK if the operation succeeeded, or an error code otherwise.
+ */
+ nsresult EndElementAt(double aOffsetSeconds);
+
+ /**
+ * Methods for supporting the SVGAnimationElement interface.
+ */
+
+ /**
+ * According to SVG 1.1 SE this returns
+ *
+ * the begin time, in seconds, for this animation element's current
+ * interval, if it exists, regardless of whether the interval has begun yet.
+ *
+ * @return the start time as defined above in milliseconds or an unresolved
+ * time if there is no current interval.
+ */
+ SMILTimeValue GetStartTime() const;
+
+ /**
+ * Returns the simple duration of this element.
+ *
+ * @return the simple duration in milliseconds or INDEFINITE.
+ */
+ SMILTimeValue GetSimpleDuration() const { return mSimpleDur; }
+
+ /**
+ * Methods for supporting hyperlinking
+ */
+
+ /**
+ * Internal SMIL methods
+ */
+
+ /**
+ * Returns the time to seek the document to when this element is targetted by
+ * a hyperlink.
+ *
+ * The behavior is defined here:
+ * http://www.w3.org/TR/smil-animation/#HyperlinkSemantics
+ *
+ * It is very similar to GetStartTime() with the exception that when the
+ * element is not active, the begin time of the *first* interval is returned.
+ *
+ * @return the time to seek the documen to in milliseconds or an unresolved
+ * time if there is no resolved interval.
+ */
+ SMILTimeValue GetHyperlinkTime() const;
+
+ /**
+ * Adds an instance time object this element's list of instance times.
+ * These instance times are used when creating intervals.
+ *
+ * This method is typically called by an SMILTimeValueSpec.
+ *
+ * @param aInstanceTime The time to add, expressed in container time.
+ * @param aIsBegin true if the time to be added represents a begin
+ * time or false if it represents an end time.
+ */
+ void AddInstanceTime(SMILInstanceTime* aInstanceTime, bool aIsBegin);
+
+ /**
+ * Requests this element update the given instance time.
+ *
+ * This method is typically called by a child SMILTimeValueSpec.
+ *
+ * @param aInstanceTime The instance time to update.
+ * @param aUpdatedTime The time to update aInstanceTime with.
+ * @param aDependentTime The instance time upon which aInstanceTime should be
+ * based.
+ * @param aIsBegin true if the time to be updated represents a begin
+ * instance time or false if it represents an end
+ * instance time.
+ */
+ void UpdateInstanceTime(SMILInstanceTime* aInstanceTime,
+ SMILTimeValue& aUpdatedTime, bool aIsBegin);
+
+ /**
+ * Removes an instance time object from this element's list of instance times.
+ *
+ * This method is typically called by a child SMILTimeValueSpec.
+ *
+ * @param aInstanceTime The instance time to remove.
+ * @param aIsBegin true if the time to be removed represents a begin
+ * time or false if it represents an end time.
+ */
+ void RemoveInstanceTime(SMILInstanceTime* aInstanceTime, bool aIsBegin);
+
+ /**
+ * Removes all the instance times associated with the given
+ * SMILTimeValueSpec object. Used when an ID assignment changes and hence
+ * all the previously associated instance times become invalid.
+ *
+ * @param aCreator The SMILTimeValueSpec object whose created
+ * SMILInstanceTime's should be removed.
+ * @param aIsBegin true if the times to be removed represent begin
+ * times or false if they are end times.
+ */
+ void RemoveInstanceTimesForCreator(const SMILTimeValueSpec* aCreator,
+ bool aIsBegin);
+
+ /**
+ * Sets the object that will be called by this timed element each time it is
+ * sampled.
+ *
+ * In Schmitz's model it is possible to associate several time clients with
+ * a timed element but for now we only allow one.
+ *
+ * @param aClient The time client to associate. Any previous time client
+ * will be disassociated and no longer sampled. Setting this
+ * to nullptr will simply disassociate the previous client,
+ * if any.
+ */
+ void SetTimeClient(SMILAnimationFunction* aClient);
+
+ /**
+ * Samples the object at the given container time. Timing intervals are
+ * updated and if this element is active at the given time the associated time
+ * client will be sampled with the appropriate simple time.
+ *
+ * @param aContainerTime The container time at which to sample.
+ */
+ void SampleAt(SMILTime aContainerTime);
+
+ /**
+ * Performs a special sample for the end of an interval. Such a sample should
+ * only advance the timed element (and any dependent elements) to the waiting
+ * or postactive state. It should not cause a transition to the active state.
+ * Transition to the active state is only performed on a regular SampleAt.
+ *
+ * This allows all interval ends at a given time to be processed first and
+ * hence the new interval can be established based on full information of the
+ * available instance times.
+ *
+ * @param aContainerTime The container time at which to sample.
+ */
+ void SampleEndAt(SMILTime aContainerTime);
+
+ /**
+ * Informs the timed element that its time container has changed time
+ * relative to document time. The timed element therefore needs to update its
+ * dependent elements (which may belong to a different time container) so they
+ * can re-resolve their times.
+ */
+ void HandleContainerTimeChange();
+
+ /**
+ * Resets this timed element's accumulated times and intervals back to start
+ * up state.
+ *
+ * This is used for backwards seeking where rather than accumulating
+ * historical timing state and winding it back, we reset the element and seek
+ * forwards.
+ */
+ void Rewind();
+
+ /**
+ * Marks this element as disabled or not. If the element is disabled, it
+ * will ignore any future samples and discard any accumulated timing state.
+ *
+ * This is used by SVG to "turn off" timed elements when the associated
+ * animation element has failing conditional processing tests.
+ *
+ * Returns true if the disabled state of the timed element was changed
+ * as a result of this call (i.e. it was not a redundant call).
+ */
+ bool SetIsDisabled(bool aIsDisabled);
+
+ /**
+ * Attempts to set an attribute on this timed element.
+ *
+ * @param aAttribute The name of the attribute to set. The namespace of this
+ * attribute is not specified as it is checked by the host
+ * element. Only attributes in the namespace defined for
+ * SMIL attributes in the host language are passed to the
+ * timed element.
+ * @param aValue The attribute value.
+ * @param aResult The nsAttrValue object that may be used for storing the
+ * parsed result.
+ * @param aContextElement The element to use for context when resolving
+ * references to other elements.
+ * @param[out] aParseResult The result of parsing the attribute. Will be set
+ * to NS_OK if parsing is successful.
+ *
+ * @return true if the given attribute is a timing attribute, false
+ * otherwise.
+ */
+ bool SetAttr(nsAtom* aAttribute, const nsAString& aValue,
+ nsAttrValue& aResult, Element& aContextElement,
+ nsresult* aParseResult = nullptr);
+
+ /**
+ * Attempts to unset an attribute on this timed element.
+ *
+ * @param aAttribute The name of the attribute to set. As with SetAttr the
+ * namespace of the attribute is not specified (see
+ * SetAttr).
+ *
+ * @return true if the given attribute is a timing attribute, false
+ * otherwise.
+ */
+ bool UnsetAttr(nsAtom* aAttribute);
+
+ /**
+ * Adds a syncbase dependency to the list of dependents that will be notified
+ * when this timed element creates, deletes, or updates its current interval.
+ *
+ * @param aDependent The SMILTimeValueSpec object to notify. A raw pointer
+ * to this object will be stored. Therefore it is necessary
+ * for the object to be explicitly unregistered (with
+ * RemoveDependent) when it is destroyed.
+ */
+ void AddDependent(SMILTimeValueSpec& aDependent);
+
+ /**
+ * Removes a syncbase dependency from the list of dependents that are notified
+ * when the current interval is modified.
+ *
+ * @param aDependent The SMILTimeValueSpec object to unregister.
+ */
+ void RemoveDependent(SMILTimeValueSpec& aDependent);
+
+ /**
+ * Determines if this timed element is dependent on the given timed element's
+ * begin time for the interval currently in effect. Whilst the element is in
+ * the active state this is the current interval and in the postactive or
+ * waiting state this is the previous interval if one exists. In all other
+ * cases the element is not considered a time dependent of any other element.
+ *
+ * @param aOther The potential syncbase element.
+ * @return true if this timed element's begin time for the currently
+ * effective interval is directly or indirectly derived from aOther, false
+ * otherwise.
+ */
+ bool IsTimeDependent(const SMILTimedElement& aOther) const;
+
+ /**
+ * Called when the timed element has been bound to the document so that
+ * references from this timed element to other elements can be resolved.
+ *
+ * @param aContextElement The element which provides the necessary context for
+ * resolving references. This is typically the element
+ * in the host language that owns this timed element.
+ */
+ void BindToTree(Element& aContextElement);
+
+ /**
+ * Called when the target of the animation has changed so that event
+ * registrations can be updated.
+ */
+ void HandleTargetElementChange(Element* aNewTarget);
+
+ /**
+ * Called when the timed element has been removed from a document so that
+ * references to other elements can be broken.
+ */
+ void DissolveReferences() { Unlink(); }
+
+ // Cycle collection
+ void Traverse(nsCycleCollectionTraversalCallback* aCallback);
+ void Unlink();
+
+ using RemovalTestFunction = bool (*)(SMILInstanceTime* aInstance);
+
+ protected:
+ // Typedefs
+ using TimeValueSpecList = nsTArray<UniquePtr<SMILTimeValueSpec>>;
+ using InstanceTimeList = nsTArray<RefPtr<SMILInstanceTime>>;
+ using IntervalList = nsTArray<UniquePtr<SMILInterval>>;
+ using TimeValueSpecPtrKey = nsPtrHashKey<SMILTimeValueSpec>;
+ using TimeValueSpecHashSet = nsTHashtable<TimeValueSpecPtrKey>;
+
+ // Helper classes
+ class InstanceTimeComparator {
+ public:
+ bool Equals(const SMILInstanceTime* aElem1,
+ const SMILInstanceTime* aElem2) const;
+ bool LessThan(const SMILInstanceTime* aElem1,
+ const SMILInstanceTime* aElem2) const;
+ };
+
+ // Templated helper functions
+ template <class TestFunctor>
+ void RemoveInstanceTimes(InstanceTimeList& aArray, TestFunctor& aTest);
+
+ //
+ // Implementation helpers
+ //
+
+ nsresult SetBeginSpec(const nsAString& aBeginSpec, Element& aContextElement,
+ RemovalTestFunction aRemove);
+ nsresult SetEndSpec(const nsAString& aEndSpec, Element& aContextElement,
+ RemovalTestFunction aRemove);
+ nsresult SetSimpleDuration(const nsAString& aDurSpec);
+ nsresult SetMin(const nsAString& aMinSpec);
+ nsresult SetMax(const nsAString& aMaxSpec);
+ nsresult SetRestart(const nsAString& aRestartSpec);
+ nsresult SetRepeatCount(const nsAString& aRepeatCountSpec);
+ nsresult SetRepeatDur(const nsAString& aRepeatDurSpec);
+ nsresult SetFillMode(const nsAString& aFillModeSpec);
+
+ void UnsetBeginSpec(RemovalTestFunction aRemove);
+ void UnsetEndSpec(RemovalTestFunction aRemove);
+ void UnsetSimpleDuration();
+ void UnsetMin();
+ void UnsetMax();
+ void UnsetRestart();
+ void UnsetRepeatCount();
+ void UnsetRepeatDur();
+ void UnsetFillMode();
+
+ nsresult SetBeginOrEndSpec(const nsAString& aSpec, Element& aContextElement,
+ bool aIsBegin, RemovalTestFunction aRemove);
+ void ClearSpecs(TimeValueSpecList& aSpecs, InstanceTimeList& aInstances,
+ RemovalTestFunction aRemove);
+ void ClearIntervals();
+ void DoSampleAt(SMILTime aContainerTime, bool aEndOnly);
+
+ /**
+ * Helper function to check for an early end and, if necessary, update the
+ * current interval accordingly.
+ *
+ * See SMIL 3.0, section 5.4.5, Element life cycle, "Active Time - Playing an
+ * interval" for a description of ending early.
+ *
+ * @param aSampleTime The current sample time. Early ends should only be
+ * applied at the last possible moment (i.e. if they are at
+ * or before the current sample time) and only if the
+ * current interval is not already ending.
+ * @return true if the end time of the current interval was updated,
+ * false otherwise.
+ */
+ bool ApplyEarlyEnd(const SMILTimeValue& aSampleTime);
+
+ /**
+ * Clears certain state in response to the element restarting.
+ *
+ * This state is described in SMIL 3.0, section 5.4.3, Resetting element state
+ */
+ void Reset();
+
+ /**
+ * Clears all accumulated timing state except for those instance times for
+ * which aRemove does not return true.
+ *
+ * Unlike the Reset method which only clears instance times, this clears the
+ * element's state, intervals (including current interval), and tells the
+ * client animation function to stop applying a result. In effect, it returns
+ * the element to its initial state but preserves any instance times excluded
+ * by the passed-in function.
+ */
+ void ClearTimingState(RemovalTestFunction aRemove);
+
+ /**
+ * Recreates timing state by re-applying begin/end attributes specified on
+ * the associated animation element.
+ *
+ * Note that this does not completely restore the information cleared by
+ * ClearTimingState since it leaves the element in the startup state.
+ * The element state will be updated on the next sample.
+ */
+ void RebuildTimingState(RemovalTestFunction aRemove);
+
+ /**
+ * Completes a seek operation by sending appropriate events and, in the case
+ * of a backwards seek, updating the state of timing information that was
+ * previously considered historical.
+ */
+ void DoPostSeek();
+
+ /**
+ * Unmarks instance times that were previously preserved because they were
+ * considered important historical milestones but are no longer such because
+ * a backwards seek has been performed.
+ */
+ void UnpreserveInstanceTimes(InstanceTimeList& aList);
+
+ /**
+ * Helper function to iterate through this element's accumulated timing
+ * information (specifically old SMILIntervals and SMILTimeInstanceTimes)
+ * and discard items that are no longer needed or exceed some threshold of
+ * accumulated state.
+ */
+ void FilterHistory();
+
+ // Helper functions for FilterHistory to clear old SMILIntervals and
+ // SMILInstanceTimes respectively.
+ void FilterIntervals();
+ void FilterInstanceTimes(InstanceTimeList& aList);
+
+ /**
+ * Calculates the next acceptable interval for this element after the
+ * specified interval, or, if no previous interval is specified, it will be
+ * the first interval with an end time after t=0.
+ *
+ * @see SMILANIM 3.6.8
+ *
+ * @param aPrevInterval The previous interval used. If supplied, the first
+ * interval that begins after aPrevInterval will be
+ * returned. May be nullptr.
+ * @param aReplacedInterval The interval that is being updated (if any). This
+ * used to ensure we don't return interval endpoints
+ * that are dependent on themselves. May be nullptr.
+ * @param aFixedBeginTime The time to use for the start of the interval. This
+ * is used when only the endpoint of the interval
+ * should be updated such as when the animation is in
+ * the ACTIVE state. May be nullptr.
+ * @param[out] aResult The next interval. Will be unchanged if no suitable
+ * interval was found (in which case false will be
+ * returned).
+ * @return true if a suitable interval was found, false otherwise.
+ */
+ bool GetNextInterval(const SMILInterval* aPrevInterval,
+ const SMILInterval* aReplacedInterval,
+ const SMILInstanceTime* aFixedBeginTime,
+ SMILInterval& aResult) const;
+ SMILInstanceTime* GetNextGreater(const InstanceTimeList& aList,
+ const SMILTimeValue& aBase,
+ int32_t& aPosition) const;
+ SMILInstanceTime* GetNextGreaterOrEqual(const InstanceTimeList& aList,
+ const SMILTimeValue& aBase,
+ int32_t& aPosition) const;
+ SMILTimeValue CalcActiveEnd(const SMILTimeValue& aBegin,
+ const SMILTimeValue& aEnd) const;
+ SMILTimeValue GetRepeatDuration() const;
+ SMILTimeValue ApplyMinAndMax(const SMILTimeValue& aDuration) const;
+ SMILTime ActiveTimeToSimpleTime(SMILTime aActiveTime,
+ uint32_t& aRepeatIteration);
+ SMILInstanceTime* CheckForEarlyEnd(const SMILTimeValue& aContainerTime) const;
+ void UpdateCurrentInterval(bool aForceChangeNotice = false);
+ void SampleSimpleTime(SMILTime aActiveTime);
+ void SampleFillValue();
+ nsresult AddInstanceTimeFromCurrentTime(SMILTime aCurrentTime,
+ double aOffsetSeconds, bool aIsBegin);
+ void RegisterMilestone();
+ bool GetNextMilestone(SMILMilestone& aNextMilestone) const;
+
+ // Notification methods. Note that these notifications can result in nested
+ // calls to this same object. Therefore,
+ // (i) we should not perform notification until this object is in
+ // a consistent state to receive callbacks, and
+ // (ii) after calling these methods we must assume that the state of the
+ // element may have changed.
+ void NotifyNewInterval();
+ void NotifyChangedInterval(SMILInterval* aInterval, bool aBeginObjectChanged,
+ bool aEndObjectChanged);
+
+ void FireTimeEventAsync(EventMessage aMsg, int32_t aDetail);
+ const SMILInstanceTime* GetEffectiveBeginInstance() const;
+ const SMILInterval* GetPreviousInterval() const;
+ bool HasPlayed() const { return !mOldIntervals.IsEmpty(); }
+ bool HasClientInFillRange() const;
+ bool EndHasEventConditions() const;
+ bool AreEndTimesDependentOn(const SMILInstanceTime* aBase) const;
+
+ // Reset the current interval by first passing ownership to a temporary
+ // variable so that if Unlink() results in us receiving a callback,
+ // mCurrentInterval will be nullptr and we will be in a consistent state.
+ void ResetCurrentInterval() {
+ if (mCurrentInterval) {
+ // Transfer ownership to temp var. (This sets mCurrentInterval to null.)
+ auto interval = std::move(mCurrentInterval);
+ interval->Unlink();
+ }
+ }
+
+ //
+ // Members
+ //
+ mozilla::dom::SVGAnimationElement* mAnimationElement; // [weak] won't outlive
+ // owner
+ TimeValueSpecList mBeginSpecs; // [strong]
+ TimeValueSpecList mEndSpecs; // [strong]
+
+ SMILTimeValue mSimpleDur;
+
+ SMILRepeatCount mRepeatCount;
+ SMILTimeValue mRepeatDur;
+
+ SMILTimeValue mMin;
+ SMILTimeValue mMax;
+
+ enum SMILFillMode : uint8_t { FILL_REMOVE, FILL_FREEZE };
+ SMILFillMode mFillMode;
+ static const nsAttrValue::EnumTable sFillModeTable[];
+
+ enum SMILRestartMode : uint8_t {
+ RESTART_ALWAYS,
+ RESTART_WHENNOTACTIVE,
+ RESTART_NEVER
+ };
+ SMILRestartMode mRestartMode;
+ static const nsAttrValue::EnumTable sRestartModeTable[];
+
+ InstanceTimeList mBeginInstances;
+ InstanceTimeList mEndInstances;
+ uint32_t mInstanceSerialIndex;
+
+ SMILAnimationFunction* mClient;
+ UniquePtr<SMILInterval> mCurrentInterval;
+ IntervalList mOldIntervals;
+ uint32_t mCurrentRepeatIteration;
+ SMILMilestone mPrevRegisteredMilestone;
+ static const SMILMilestone sMaxMilestone;
+ static const uint8_t sMaxNumIntervals;
+ static const uint8_t sMaxNumInstanceTimes;
+
+ // Set of dependent time value specs to be notified when establishing a new
+ // current interval. Change notifications and delete notifications are handled
+ // by the interval.
+ //
+ // [weak] The SMILTimeValueSpec objects register themselves and unregister
+ // on destruction. Likewise, we notify them when we are destroyed.
+ TimeValueSpecHashSet mTimeDependents;
+
+ /**
+ * The state of the element in its life-cycle. These states are based on the
+ * element life-cycle described in SMILANIM 3.6.8
+ */
+ enum SMILElementState {
+ STATE_STARTUP,
+ STATE_WAITING,
+ STATE_ACTIVE,
+ STATE_POSTACTIVE
+ };
+ SMILElementState mElementState;
+
+ enum SMILSeekState {
+ SEEK_NOT_SEEKING,
+ SEEK_FORWARD_FROM_ACTIVE,
+ SEEK_FORWARD_FROM_INACTIVE,
+ SEEK_BACKWARD_FROM_ACTIVE,
+ SEEK_BACKWARD_FROM_INACTIVE
+ };
+ SMILSeekState mSeekState;
+
+ // Used to batch updates to the timing model
+ class AutoIntervalUpdateBatcher;
+ bool mDeferIntervalUpdates;
+ bool mDoDeferredUpdate; // Set if an update to the current interval was
+ // requested while mDeferIntervalUpdates was set
+ bool mIsDisabled;
+
+ // Stack-based helper class to call UpdateCurrentInterval when it is destroyed
+ class AutoIntervalUpdater;
+
+ // Recursion depth checking
+ uint8_t mDeleteCount;
+ uint8_t mUpdateIntervalRecursionDepth;
+ static const uint8_t sMaxUpdateIntervalRecursionDepth;
+};
+
+inline void ImplCycleCollectionUnlink(SMILTimedElement& aField) {
+ aField.Unlink();
+}
+
+inline void ImplCycleCollectionTraverse(
+ nsCycleCollectionTraversalCallback& aCallback, SMILTimedElement& aField,
+ const char* aName, uint32_t aFlags = 0) {
+ aField.Traverse(&aCallback);
+}
+
+} // namespace mozilla
+
+#endif // DOM_SMIL_SMILTIMEDELEMENT_H_
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