gecko-dev/content/smil/nsSMILAnimationController.h

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is the Mozilla SMIL module.
*
* The Initial Developer of the Original Code is Brian Birtles.
* Portions created by the Initial Developer are Copyright (C) 2008
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Brian Birtles <birtles@gmail.com>
* Daniel Holbert <dholbert@mozilla.com>
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
* of those above. If you wish to allow use of your version of this file only
* under the terms of either the GPL or the LGPL, and not to allow others to
* use your version of this file under the terms of the MPL, indicate your
* decision by deleting the provisions above and replace them with the notice
* and other provisions required by the GPL or the LGPL. If you do not delete
* the provisions above, a recipient may use your version of this file under
* the terms of any one of the MPL, the GPL or the LGPL.
*
* ***** END LICENSE BLOCK ***** */
#ifndef NS_SMILANIMATIONCONTROLLER_H_
#define NS_SMILANIMATIONCONTROLLER_H_
#include "nsAutoPtr.h"
#include "nsCOMPtr.h"
#include "nsTArray.h"
#include "nsITimer.h"
#include "nsTHashtable.h"
#include "nsHashKeys.h"
#include "nsSMILTimeContainer.h"
#include "nsSMILCompositorTable.h"
#include "nsSMILMilestone.h"
#include "nsRefreshDriver.h"
struct nsSMILTargetIdentifier;
class nsISMILAnimationElement;
class nsIDocument;
//----------------------------------------------------------------------
// nsSMILAnimationController
//
// The animation controller maintains the animation timer and determines the
// sample times and sample rate for all SMIL animations in a document. There is
// at most one animation controller per nsDocument so that frame-rate tuning can
// be performed at a document-level.
//
// The animation controller can contain many child time containers (timed
// document root objects) which may correspond to SVG document fragments within
// a compound document. These time containers can be paused individually or
// here, at the document level.
//
class nsSMILAnimationController : public nsSMILTimeContainer,
public nsARefreshObserver
{
public:
nsSMILAnimationController(nsIDocument* aDoc);
~nsSMILAnimationController();
// Clears mDocument pointer. (Called by our nsIDocument when it's going away)
void Disconnect();
// nsSMILContainer
virtual void Pause(PRUint32 aType);
virtual void Resume(PRUint32 aType);
virtual nsSMILTime GetParentTime() const;
// nsARefreshObserver
NS_IMETHOD_(nsrefcnt) AddRef();
NS_IMETHOD_(nsrefcnt) Release();
virtual void WillRefresh(mozilla::TimeStamp aTime);
// Methods for registering and enumerating animation elements
void RegisterAnimationElement(nsISMILAnimationElement* aAnimationElement);
void UnregisterAnimationElement(nsISMILAnimationElement* aAnimationElement);
// Methods for resampling all animations
// (A resample performs the same operations as a sample but doesn't advance
// the current time and doesn't check if the container is paused)
void Resample() { DoSample(false); }
void SetResampleNeeded()
{
if (!mRunningSample) {
if (!mResampleNeeded) {
FlagDocumentNeedsFlush();
}
mResampleNeeded = true;
}
}
void FlushResampleRequests()
{
if (!mResampleNeeded)
return;
Resample();
}
// Methods for handling page transitions
void OnPageShow();
void OnPageHide();
// Methods for supporting cycle-collection
void Traverse(nsCycleCollectionTraversalCallback* aCallback);
void Unlink();
// Methods for relaying the availability of the refresh driver
void NotifyRefreshDriverCreated(nsRefreshDriver* aRefreshDriver);
void NotifyRefreshDriverDestroying(nsRefreshDriver* aRefreshDriver);
// Helper to check if we have any animation elements at all
bool HasRegisteredAnimations()
{ return mAnimationElementTable.Count() != 0; }
protected:
// Typedefs
typedef nsPtrHashKey<nsSMILTimeContainer> TimeContainerPtrKey;
typedef nsTHashtable<TimeContainerPtrKey> TimeContainerHashtable;
typedef nsPtrHashKey<nsISMILAnimationElement> AnimationElementPtrKey;
typedef nsTHashtable<AnimationElementPtrKey> AnimationElementHashtable;
struct SampleTimeContainerParams
{
TimeContainerHashtable* mActiveContainers;
bool mSkipUnchangedContainers;
};
struct SampleAnimationParams
{
TimeContainerHashtable* mActiveContainers;
nsSMILCompositorTable* mCompositorTable;
};
struct GetMilestoneElementsParams
{
nsTArray<nsRefPtr<nsISMILAnimationElement> > mElements;
nsSMILMilestone mMilestone;
};
// Cycle-collection implementation helpers
PR_STATIC_CALLBACK(PLDHashOperator) CompositorTableEntryTraverse(
nsSMILCompositor* aCompositor, void* aArg);
// Returns mDocument's refresh driver, if it's got one.
nsRefreshDriver* GetRefreshDriver();
// Methods for controlling whether we're sampling
void StartSampling(nsRefreshDriver* aRefreshDriver);
void StopSampling(nsRefreshDriver* aRefreshDriver);
// Wrapper for StartSampling that defers if no animations are registered.
void MaybeStartSampling(nsRefreshDriver* aRefreshDriver);
// Sample-related callbacks and implementation helpers
virtual void DoSample();
void DoSample(bool aSkipUnchangedContainers);
void RewindElements();
PR_STATIC_CALLBACK(PLDHashOperator) RewindNeeded(
TimeContainerPtrKey* aKey, void* aData);
PR_STATIC_CALLBACK(PLDHashOperator) RewindAnimation(
AnimationElementPtrKey* aKey, void* aData);
PR_STATIC_CALLBACK(PLDHashOperator) ClearRewindNeeded(
TimeContainerPtrKey* aKey, void* aData);
void DoMilestoneSamples();
PR_STATIC_CALLBACK(PLDHashOperator) GetNextMilestone(
TimeContainerPtrKey* aKey, void* aData);
PR_STATIC_CALLBACK(PLDHashOperator) GetMilestoneElements(
TimeContainerPtrKey* aKey, void* aData);
PR_STATIC_CALLBACK(PLDHashOperator) SampleTimeContainer(
TimeContainerPtrKey* aKey, void* aData);
PR_STATIC_CALLBACK(PLDHashOperator) SampleAnimation(
AnimationElementPtrKey* aKey, void* aData);
static void SampleTimedElement(nsISMILAnimationElement* aElement,
TimeContainerHashtable* aActiveContainers);
static void AddAnimationToCompositorTable(
nsISMILAnimationElement* aElement, nsSMILCompositorTable* aCompositorTable);
static bool GetTargetIdentifierForAnimation(
nsISMILAnimationElement* aAnimElem, nsSMILTargetIdentifier& aResult);
// Methods for adding/removing time containers
virtual nsresult AddChild(nsSMILTimeContainer& aChild);
virtual void RemoveChild(nsSMILTimeContainer& aChild);
void FlagDocumentNeedsFlush();
// Members
nsAutoRefCnt mRefCnt;
NS_DECL_OWNINGTHREAD
AnimationElementHashtable mAnimationElementTable;
TimeContainerHashtable mChildContainerTable;
mozilla::TimeStamp mCurrentSampleTime;
mozilla::TimeStamp mStartTime;
// Average time between samples from the refresh driver. This is used to
// detect large unexpected gaps between samples such as can occur when the
// computer sleeps. The nature of the SMIL model means that catching up these
// large gaps can be expensive as, for example, many events may need to be
// dispatched for the intervening time when no samples were received.
//
// In such cases, we ignore the intervening gap and continue sampling from
// when we were expecting the next sample to arrive.
//
// Note that we only do this for SMIL and not CSS transitions (which doesn't
// have so much work to do to catch up) nor scripted animations (which expect
// animation time to follow real time).
//
// This behaviour does not affect pausing (since we're not *expecting* any
// samples then) nor seeking (where the SMIL model behaves somewhat
// differently such as not dispatching events).
nsSMILTime mAvgTimeBetweenSamples;
bool mResampleNeeded;
// If we're told to start sampling but there are no animation elements we just
// record the time, set the following flag, and then wait until we have an
// animation element. Then we'll reset this flag and actually start sampling.
bool mDeferredStartSampling;
bool mRunningSample;
// Store raw ptr to mDocument. It owns the controller, so controller
// shouldn't outlive it
nsIDocument* mDocument;
// Contains compositors used in our last sample. We keep this around
// so we can detect when an element/attribute used to be animated,
// but isn't anymore for some reason. (e.g. if its <animate> element is
// removed or retargeted)
nsAutoPtr<nsSMILCompositorTable> mLastCompositorTable;
};
#endif // NS_SMILANIMATIONCONTROLLER_H_