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| -rw-r--r-- | dom/smil/SMILTimeContainer.h | 299 |
1 files changed, 299 insertions, 0 deletions
diff --git a/dom/smil/SMILTimeContainer.h b/dom/smil/SMILTimeContainer.h new file mode 100644 index 0000000000..62ea7ad2c4 --- /dev/null +++ b/dom/smil/SMILTimeContainer.h @@ -0,0 +1,299 @@ +/* -*- 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_SMILTIMECONTAINER_H_ +#define DOM_SMIL_SMILTIMECONTAINER_H_ + +#include "mozilla/dom/SVGAnimationElement.h" +#include "mozilla/SMILMilestone.h" +#include "mozilla/SMILTypes.h" +#include "nscore.h" +#include "nsTPriorityQueue.h" + +namespace mozilla { + +class SMILTimeValue; + +//---------------------------------------------------------------------- +// SMILTimeContainer +// +// Common base class for a time base that can be paused, resumed, and sampled. +// +class SMILTimeContainer { + public: + SMILTimeContainer(); + virtual ~SMILTimeContainer(); + + /* + * Pause request types. + */ + enum { + PAUSE_BEGIN = 1, // Paused because timeline has yet to begin. + PAUSE_SCRIPT = 2, // Paused by script. + PAUSE_PAGEHIDE = 4, // Paused because our doc is hidden. + PAUSE_USERPREF = 8, // Paused because animations are disabled in prefs. + PAUSE_IMAGE = 16 // Paused becuase we're in an image that's suspended. + }; + + /* + * Cause the time container to record its begin time. + */ + void Begin(); + + /* + * Pause this time container + * + * @param aType The source of the pause request. Successive calls to Pause + * with the same aType will be ignored. The container will remain paused until + * each call to Pause of a given aType has been matched by at least one call + * to Resume with the same aType. + */ + virtual void Pause(uint32_t aType); + + /* + * Resume this time container + * + * param @aType The source of the resume request. Clears the pause flag for + * this particular type of pause request. When all pause flags have been + * cleared the time container will be resumed. + */ + virtual void Resume(uint32_t aType); + + /** + * Returns true if this time container is paused by the specified type. + * Note that the time container may also be paused by other types; this method + * does not test if aType is the exclusive pause source. + * + * @param @aType The pause source to test for. + * @return true if this container is paused by aType. + */ + bool IsPausedByType(uint32_t aType) const { return mPauseState & aType; } + + /** + * Returns true if this time container is paused. + * Generally you should test for a specific type of pausing using + * IsPausedByType. + * + * @return true if this container is paused, false otherwise. + */ + bool IsPaused() const { return mPauseState != 0; } + + /* + * Return the time elapsed since this time container's begin time (expressed + * in parent time) minus any accumulated offset from pausing. + */ + SMILTime GetCurrentTimeAsSMILTime() const; + + /* + * Seek the document timeline to the specified time. + * + * @param aSeekTo The time to seek to, expressed in this time container's time + * base (i.e. the same units as GetCurrentTime). + */ + void SetCurrentTime(SMILTime aSeekTo); + + /* + * Return the current time for the parent time container if any. + */ + virtual SMILTime GetParentTime() const; + + /* + * Convert container time to parent time. + * + * @param aContainerTime The container time to convert. + * @return The equivalent parent time or indefinite if the container is + * paused and the time is in the future. + */ + SMILTimeValue ContainerToParentTime(SMILTime aContainerTime) const; + + /* + * Convert from parent time to container time. + * + * @param aParentTime The parent time to convert. + * @return The equivalent container time or indefinite if the container is + * paused and aParentTime is after the time when the pause began. + */ + SMILTimeValue ParentToContainerTime(SMILTime aParentTime) const; + + /* + * If the container is paused, causes the pause time to be updated to the + * current parent time. This should be called before updating + * cross-container dependencies that will call ContainerToParentTime in order + * to provide more intuitive results. + */ + void SyncPauseTime(); + + /* + * Updates the current time of this time container and calls DoSample to + * perform any sample-operations. + */ + void Sample(); + + /* + * Return if this time container should be sampled or can be skipped. + * + * This is most useful as an optimisation for skipping time containers that + * don't require a sample. + */ + bool NeedsSample() const { return !mPauseState || mNeedsPauseSample; } + + /* + * Indicates if the elements of this time container need to be rewound. + * This occurs during a backwards seek. + */ + bool NeedsRewind() const { return mNeedsRewind; } + void ClearNeedsRewind() { mNeedsRewind = false; } + + /* + * Indicates the time container is currently processing a SetCurrentTime + * request and appropriate seek behaviour should be applied by child elements + * (e.g. not firing time events). + */ + bool IsSeeking() const { return mIsSeeking; } + void MarkSeekFinished() { mIsSeeking = false; } + + /* + * Sets the parent time container. + * + * The callee still retains ownership of the time container. + */ + nsresult SetParent(SMILTimeContainer* aParent); + + /* + * Registers an element for a sample at the given time. + * + * @param aMilestone The milestone to register in container time. + * @param aElement The timebase element that needs a sample at + * aMilestone. + */ + void AddMilestone(const SMILMilestone& aMilestone, + mozilla::dom::SVGAnimationElement& aElement); + + /* + * Resets the list of milestones. + */ + void ClearMilestones(); + + /* + * Returns the next significant transition from amongst the registered + * milestones. + * + * @param[out] aNextMilestone The next milestone with time in parent time. + * + * @return true if there exists another milestone, false otherwise in + * which case aNextMilestone will be unmodified. + */ + bool GetNextMilestoneInParentTime(SMILMilestone& aNextMilestone) const; + + using AnimElemArray = nsTArray<RefPtr<dom::SVGAnimationElement>>; + + /* + * Removes and returns the timebase elements from the start of the list of + * timebase elements that match the given time. + * + * @param aMilestone The milestone time to match in parent time. This + * must be <= GetNextMilestoneInParentTime. + * @param[out] aMatchedElements The array to which matching elements will be + * appended. + * @return true if one or more elements match, false otherwise. + */ + bool PopMilestoneElementsAtMilestone(const SMILMilestone& aMilestone, + AnimElemArray& aMatchedElements); + + // Cycle-collection support + void Traverse(nsCycleCollectionTraversalCallback* aCallback); + void Unlink(); + + protected: + /* + * Per-sample operations to be performed whenever Sample() is called and + * NeedsSample() is true. Called after updating mCurrentTime; + */ + virtual void DoSample() {} + + /* + * Adding and removing child containers is not implemented in the base class + * because not all subclasses need this. + */ + + /* + * Adds a child time container. + */ + virtual nsresult AddChild(SMILTimeContainer& aChild) { + return NS_ERROR_FAILURE; + } + + /* + * Removes a child time container. + */ + virtual void RemoveChild(SMILTimeContainer& aChild) {} + + /* + * Implementation helper to update the current time. + */ + void UpdateCurrentTime(); + + /* + * Implementation helper to notify timed elements with dependencies that the + * container time has changed with respect to the document time. + */ + void NotifyTimeChange(); + + // The parent time container, if any + SMILTimeContainer* mParent; + + // The current time established at the last call to Sample() + SMILTime mCurrentTime; + + // The number of milliseconds for which the container has been paused + // (excluding the current pause interval if the container is currently + // paused). + // + // Current time = parent time - mParentOffset + // + SMILTime mParentOffset; + + // The timestamp in parent time when the container was paused + SMILTime mPauseStart; + + // Whether or not a pause sample is required + bool mNeedsPauseSample; + + bool mNeedsRewind; // Backwards seek performed + bool mIsSeeking; // Currently in the middle of a seek operation + +#ifdef DEBUG + bool mHoldingEntries; // True if there's a raw pointer to mMilestoneEntries + // on the stack. +#endif + + // A bitfield of the pause state for all pause requests + uint32_t mPauseState; + + struct MilestoneEntry { + MilestoneEntry(const SMILMilestone& aMilestone, + mozilla::dom::SVGAnimationElement& aElement) + : mMilestone(aMilestone), mTimebase(&aElement) {} + + bool operator<(const MilestoneEntry& aOther) const { + return mMilestone < aOther.mMilestone; + } + + SMILMilestone mMilestone; // In container time. + RefPtr<mozilla::dom::SVGAnimationElement> mTimebase; + }; + + // Queue of elements with registered milestones. Used to update the model with + // significant transitions that occur between two samples. Since timed element + // re-register their milestones when they're sampled this is reset once we've + // taken care of the milestones before the current sample time but before we + // actually do the full sample. + nsTPriorityQueue<MilestoneEntry> mMilestoneEntries; +}; + +} // namespace mozilla + +#endif // DOM_SMIL_SMILTIMECONTAINER_H_ |