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gecko/content/smil/nsSMILTimedElement.cpp

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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) 2006
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
* Brian Birtles <birtles@gmail.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 ***** */
#include "nsSMILTimedElement.h"
#include "nsSMILAnimationFunction.h"
#include "nsSMILTimeValue.h"
#include "nsSMILTimeValueSpec.h"
#include "nsSMILInstanceTime.h"
#include "nsSMILParserUtils.h"
#include "nsSMILTimeContainer.h"
#include "nsGkAtoms.h"
#include "nsGUIEvent.h"
#include "nsEventDispatcher.h"
#include "nsReadableUtils.h"
#include "nsMathUtils.h"
#include "nsThreadUtils.h"
#include "nsIPresShell.h"
#include "prdtoa.h"
#include "plstr.h"
#include "prtime.h"
#include "nsString.h"
//----------------------------------------------------------------------
// Helper class: InstanceTimeComparator
// Upon inserting an instance time into one of our instance time lists we assign
// it a serial number. This allows us to sort the instance times in such a way
// that where we have several equal instance times, the ones added later will
// sort later. This means that when we call UpdateCurrentInterval during the
// waiting state we won't unnecessarily change the begin instance.
//
// The serial number also means that every instance time has an unambiguous
// position in the array so we can use RemoveElementSorted and the like.
PRBool
nsSMILTimedElement::InstanceTimeComparator::Equals(
const nsSMILInstanceTime* aElem1,
const nsSMILInstanceTime* aElem2) const
{
NS_ABORT_IF_FALSE(aElem1 && aElem2,
"Trying to compare null instance time pointers");
NS_ABORT_IF_FALSE(aElem1->Serial() && aElem2->Serial(),
"Instance times have not been assigned serial numbers");
NS_ABORT_IF_FALSE(aElem1 == aElem2 || aElem1->Serial() != aElem2->Serial(),
"Serial numbers are not unique");
return aElem1->Serial() == aElem2->Serial();
}
PRBool
nsSMILTimedElement::InstanceTimeComparator::LessThan(
const nsSMILInstanceTime* aElem1,
const nsSMILInstanceTime* aElem2) const
{
NS_ABORT_IF_FALSE(aElem1 && aElem2,
"Trying to compare null instance time pointers");
NS_ABORT_IF_FALSE(aElem1->Serial() && aElem2->Serial(),
"Instance times have not been assigned serial numbers");
PRInt8 cmp = aElem1->Time().CompareTo(aElem2->Time());
return cmp == 0 ? aElem1->Serial() < aElem2->Serial() : cmp < 0;
}
//----------------------------------------------------------------------
// Helper class: AsyncTimeEventRunner
namespace
{
class AsyncTimeEventRunner : public nsRunnable
{
protected:
nsRefPtr<nsIContent> mTarget;
PRUint32 mMsg;
PRInt32 mDetail;
public:
AsyncTimeEventRunner(nsIContent* aTarget, PRUint32 aMsg, PRInt32 aDetail)
: mTarget(aTarget), mMsg(aMsg), mDetail(aDetail)
{
}
NS_IMETHOD Run()
{
nsUIEvent event(PR_TRUE, mMsg, mDetail);
event.eventStructType = NS_SMIL_TIME_EVENT;
nsPresContext* context = nsnull;
nsIDocument* doc = mTarget->GetCurrentDoc();
if (doc) {
nsCOMPtr<nsIPresShell> shell = doc->GetShell();
if (shell) {
context = shell->GetPresContext();
}
}
return nsEventDispatcher::Dispatch(mTarget, context, &event);
}
};
}
//----------------------------------------------------------------------
// Templated helper functions
// Selectively remove elements from an array of type
// nsTArray<nsRefPtr<nsSMILInstanceTime> > with O(n) performance.
template <class TestFunctor>
void
nsSMILTimedElement::RemoveInstanceTimes(InstanceTimeList& aArray,
TestFunctor& aTest)
{
InstanceTimeList newArray;
for (PRUint32 i = 0; i < aArray.Length(); ++i) {
nsSMILInstanceTime* item = aArray[i].get();
if (aTest(item, i)) {
item->Unlink();
} else {
newArray.AppendElement(item);
}
}
aArray.Clear();
aArray.SwapElements(newArray);
}
//----------------------------------------------------------------------
// Static members
nsAttrValue::EnumTable nsSMILTimedElement::sFillModeTable[] = {
{"remove", FILL_REMOVE},
{"freeze", FILL_FREEZE},
{nsnull, 0}
};
nsAttrValue::EnumTable nsSMILTimedElement::sRestartModeTable[] = {
{"always", RESTART_ALWAYS},
{"whenNotActive", RESTART_WHENNOTACTIVE},
{"never", RESTART_NEVER},
{nsnull, 0}
};
const nsSMILMilestone nsSMILTimedElement::sMaxMilestone(LL_MAXINT, PR_FALSE);
// The thresholds at which point we start filtering intervals and instance times
// indiscriminately.
// See FilterIntervals and FilterInstanceTimes.
const PRUint8 nsSMILTimedElement::sMaxNumIntervals = 20;
const PRUint8 nsSMILTimedElement::sMaxNumInstanceTimes = 100;
//----------------------------------------------------------------------
// Ctor, dtor
nsSMILTimedElement::nsSMILTimedElement()
:
mAnimationElement(nsnull),
mFillMode(FILL_REMOVE),
mRestartMode(RESTART_ALWAYS),
mInstanceSerialIndex(0),
mClient(nsnull),
mCurrentInterval(nsnull),
mCurrentRepeatIteration(0),
mPrevRegisteredMilestone(sMaxMilestone),
mElementState(STATE_STARTUP),
mSeekState(SEEK_NOT_SEEKING)
{
mSimpleDur.SetIndefinite();
mMin.SetMillis(0L);
mMax.SetIndefinite();
mTimeDependents.Init();
}
nsSMILTimedElement::~nsSMILTimedElement()
{
// Unlink all instance times from dependent intervals
for (PRUint32 i = 0; i < mBeginInstances.Length(); ++i) {
mBeginInstances[i]->Unlink();
}
mBeginInstances.Clear();
for (PRUint32 i = 0; i < mEndInstances.Length(); ++i) {
mEndInstances[i]->Unlink();
}
mEndInstances.Clear();
// Notify anyone listening to our intervals that they're gone
// (We shouldn't get any callbacks from this because all our instance times
// are now disassociated with any intervals)
mElementState = STATE_POSTACTIVE;
ResetCurrentInterval();
for (PRInt32 i = mOldIntervals.Length() - 1; i >= 0; --i) {
mOldIntervals[i]->Unlink();
}
mOldIntervals.Clear();
}
void
nsSMILTimedElement::SetAnimationElement(nsISMILAnimationElement* aElement)
{
NS_ABORT_IF_FALSE(aElement, "NULL owner element");
NS_ABORT_IF_FALSE(!mAnimationElement, "Re-setting owner");
mAnimationElement = aElement;
}
nsSMILTimeContainer*
nsSMILTimedElement::GetTimeContainer()
{
return mAnimationElement ? mAnimationElement->GetTimeContainer() : nsnull;
}
//----------------------------------------------------------------------
// nsIDOMElementTimeControl methods
//
// The definition of the ElementTimeControl interface differs between SMIL
// Animation and SVG 1.1. In SMIL Animation all methods have a void return
// type and the new instance time is simply added to the list and restart
// semantics are applied as with any other instance time. In the SVG definition
// the methods return a bool depending on the restart mode.
//
// This inconsistency has now been addressed by an erratum in SVG 1.1:
//
// http://www.w3.org/2003/01/REC-SVG11-20030114-errata#elementtimecontrol-interface
//
// which favours the definition in SMIL, i.e. instance times are just added
// without first checking the restart mode.
nsresult
nsSMILTimedElement::BeginElementAt(double aOffsetSeconds)
{
nsSMILTimeContainer* container = GetTimeContainer();
if (!container)
return NS_ERROR_FAILURE;
nsSMILTime currentTime = container->GetCurrentTime();
AddInstanceTimeFromCurrentTime(currentTime, aOffsetSeconds, PR_TRUE);
return NS_OK;
}
nsresult
nsSMILTimedElement::EndElementAt(double aOffsetSeconds)
{
nsSMILTimeContainer* container = GetTimeContainer();
if (!container)
return NS_ERROR_FAILURE;
nsSMILTime currentTime = container->GetCurrentTime();
AddInstanceTimeFromCurrentTime(currentTime, aOffsetSeconds, PR_FALSE);
return NS_OK;
}
//----------------------------------------------------------------------
// nsSVGAnimationElement methods
nsSMILTimeValue
nsSMILTimedElement::GetStartTime() const
{
return mElementState == STATE_WAITING || mElementState == STATE_ACTIVE
? mCurrentInterval->Begin()->Time()
: nsSMILTimeValue();
}
//----------------------------------------------------------------------
// nsSMILTimedElement
void
nsSMILTimedElement::AddInstanceTime(nsSMILInstanceTime* aInstanceTime,
PRBool aIsBegin)
{
NS_ABORT_IF_FALSE(aInstanceTime, "Attempting to add null instance time");
// Event-sensitivity: If an element is not active (but the parent time
// container is), then events are only handled for begin specifications.
if (mElementState != STATE_ACTIVE && !aIsBegin &&
aInstanceTime->IsDynamic())
{
// No need to call Unlink here--dynamic instance times shouldn't be linked
// to anything that's going to miss them
NS_ABORT_IF_FALSE(!aInstanceTime->GetBaseInterval(),
"Dynamic instance time has a base interval--we probably need to unlink"
" it if we're not going to use it");
return;
}
aInstanceTime->SetSerial(++mInstanceSerialIndex);
InstanceTimeList& instanceList = aIsBegin ? mBeginInstances : mEndInstances;
nsRefPtr<nsSMILInstanceTime>* inserted =
instanceList.InsertElementSorted(aInstanceTime, InstanceTimeComparator());
if (!inserted) {
NS_WARNING("Insufficient memory to insert instance time");
return;
}
UpdateCurrentInterval();
}
void
nsSMILTimedElement::UpdateInstanceTime(nsSMILInstanceTime* aInstanceTime,
nsSMILTimeValue& aUpdatedTime,
PRBool aIsBegin)
{
NS_ABORT_IF_FALSE(aInstanceTime, "Attempting to update null instance time");
// The reason we update the time here and not in the nsSMILTimeValueSpec is
// that it means we *could* re-sort more efficiently by doing a sorted remove
// and insert but currently this doesn't seem to be necessary given how
// infrequently we get these change notices.
aInstanceTime->DependentUpdate(aUpdatedTime);
InstanceTimeList& instanceList = aIsBegin ? mBeginInstances : mEndInstances;
instanceList.Sort(InstanceTimeComparator());
// Generally speaking, UpdateCurrentInterval makes changes to the current
// interval and sends changes notices itself. However, in this case because
// instance times are shared between the instance time list and the intervals
// we are effectively changing the current interval outside
// UpdateCurrentInterval so we need to explicitly signal that we've made
// a change.
//
// This wouldn't be necessary if we cloned instance times on adding them to
// the current interval but this introduces other complications (particularly
// detecting which instance time is being used to define the begin of the
// current interval when doing a Reset).
PRBool changedCurrentInterval = mCurrentInterval &&
(mCurrentInterval->Begin() == aInstanceTime ||
mCurrentInterval->End() == aInstanceTime);
UpdateCurrentInterval(changedCurrentInterval);
}
void
nsSMILTimedElement::RemoveInstanceTime(nsSMILInstanceTime* aInstanceTime,
PRBool aIsBegin)
{
NS_ABORT_IF_FALSE(aInstanceTime, "Attempting to remove null instance time");
InstanceTimeList& instanceList = aIsBegin ? mBeginInstances : mEndInstances;
#ifdef DEBUG
PRBool found =
#endif
instanceList.RemoveElementSorted(aInstanceTime, InstanceTimeComparator());
NS_ABORT_IF_FALSE(found, "Couldn't find instance time to delete");
UpdateCurrentInterval();
}
namespace
{
class RemoveByCreator
{
public:
RemoveByCreator(const nsSMILTimeValueSpec* aCreator) : mCreator(aCreator)
{ }
PRBool operator()(nsSMILInstanceTime* aInstanceTime, PRUint32 /*aIndex*/)
{
return aInstanceTime->GetCreator() == mCreator;
}
private:
const nsSMILTimeValueSpec* mCreator;
};
}
void
nsSMILTimedElement::RemoveInstanceTimesForCreator(
const nsSMILTimeValueSpec* aCreator, PRBool aIsBegin)
{
NS_ABORT_IF_FALSE(aCreator, "Creator not set");
InstanceTimeList& instances = aIsBegin ? mBeginInstances : mEndInstances;
RemoveByCreator removeByCreator(aCreator);
RemoveInstanceTimes(instances, removeByCreator);
UpdateCurrentInterval();
}
void
nsSMILTimedElement::SetTimeClient(nsSMILAnimationFunction* aClient)
{
//
// No need to check for NULL. A NULL parameter simply means to remove the
// previous client which we do by setting to NULL anyway.
//
mClient = aClient;
}
void
nsSMILTimedElement::SampleAt(nsSMILTime aContainerTime)
{
// Milestones are cleared before a sample
mPrevRegisteredMilestone = sMaxMilestone;
DoSampleAt(aContainerTime, PR_FALSE);
}
void
nsSMILTimedElement::SampleEndAt(nsSMILTime aContainerTime)
{
// Milestones are cleared before a sample
mPrevRegisteredMilestone = sMaxMilestone;
// If the current interval changes, we don't bother trying to remove any old
// milestones we'd registered. So it's possible to get a call here to end an
// interval at a time that no longer reflects the end of the current interval.
//
// For now we just check that we're actually in an interval but note that the
// initial sample we use to initialise the model is an end sample. This is
// because we want to resolve all the instance times before committing to an
// initial interval. Therefore an end sample from the startup state is also
// acceptable.
if (mElementState == STATE_ACTIVE || mElementState == STATE_STARTUP) {
DoSampleAt(aContainerTime, PR_TRUE); // End sample
} else {
// Even if this was an unnecessary milestone sample we want to be sure that
// our next real milestone is registered.
RegisterMilestone();
}
}
void
nsSMILTimedElement::DoSampleAt(nsSMILTime aContainerTime, PRBool aEndOnly)
{
NS_ABORT_IF_FALSE(mAnimationElement,
"Got sample before being registered with an animation element");
NS_ABORT_IF_FALSE(GetTimeContainer(),
"Got sample without being registered with a time container");
// This could probably happen if we later implement externalResourcesRequired
// (bug 277955) and whilst waiting for those resources (and the animation to
// start) we transfer a node from another document fragment that has already
// started. In such a case we might receive milestone samples registered with
// the already active container.
if (GetTimeContainer()->IsPausedByType(nsSMILTimeContainer::PAUSE_BEGIN))
return;
// We use an end-sample to start animation since an end-sample lets us
// tentatively create an interval without committing to it (by transitioning
// to the ACTIVE state) and this is necessary because we might have
// dependencies on other animations that are yet to start. After these
// other animations start, it may be necessary to revise our initial interval.
//
// However, sometimes instead of an end-sample we can get a regular sample
// during STARTUP state. This can happen, for example, if we register
// a milestone before time t=0 and are then re-bound to the tree (which sends
// us back to the STARTUP state). In such a case we should just ignore the
// sample and wait for our real initial sample which will be an end-sample.
if (mElementState == STATE_STARTUP && !aEndOnly)
return;
PRBool finishedSeek = PR_FALSE;
if (GetTimeContainer()->IsSeeking() && mSeekState == SEEK_NOT_SEEKING) {
mSeekState = mElementState == STATE_ACTIVE ?
SEEK_FORWARD_FROM_ACTIVE :
SEEK_FORWARD_FROM_INACTIVE;
} else if (mSeekState != SEEK_NOT_SEEKING &&
!GetTimeContainer()->IsSeeking()) {
finishedSeek = PR_TRUE;
}
PRBool stateChanged;
nsSMILTimeValue sampleTime(aContainerTime);
do {
#ifdef DEBUG
// Check invariant
if (mElementState == STATE_STARTUP || mElementState == STATE_POSTACTIVE) {
NS_ABORT_IF_FALSE(!mCurrentInterval,
"Shouldn't have current interval in startup or postactive states");
} else {
NS_ABORT_IF_FALSE(mCurrentInterval,
"Should have current interval in waiting and active states");
}
#endif
stateChanged = PR_FALSE;
switch (mElementState)
{
case STATE_STARTUP:
{
nsSMILInterval firstInterval;
mElementState =
NS_SUCCEEDED(GetNextInterval(nsnull, nsnull, firstInterval))
? STATE_WAITING
: STATE_POSTACTIVE;
stateChanged = PR_TRUE;
if (mElementState == STATE_WAITING) {
mCurrentInterval = new nsSMILInterval(firstInterval);
NotifyNewInterval();
}
}
break;
case STATE_WAITING:
{
if (mCurrentInterval->Begin()->Time() <= sampleTime) {
mElementState = STATE_ACTIVE;
mCurrentInterval->FixBegin();
if (mClient) {
mClient->Activate(mCurrentInterval->Begin()->Time().GetMillis());
}
if (mSeekState == SEEK_NOT_SEEKING) {
FireTimeEventAsync(NS_SMIL_BEGIN, 0);
}
if (HasPlayed()) {
Reset(); // Apply restart behaviour
// The call to Reset() may mean that the end point of our current
// interval should be changed and so we should update the interval
// now. However, calling UpdateCurrentInterval could result in the
// interval getting deleted (perhaps through some web of syncbase
// dependencies) therefore we make updating the interval the last
// thing we do. There is no guarantee that mCurrentInterval is set
// after this.
UpdateCurrentInterval();
}
stateChanged = PR_TRUE;
}
}
break;
case STATE_ACTIVE:
{
ApplyEarlyEnd(sampleTime);
if (mCurrentInterval->End()->Time() <= sampleTime) {
nsSMILInterval newInterval;
mElementState =
NS_SUCCEEDED(GetNextInterval(mCurrentInterval, nsnull, newInterval))
? STATE_WAITING
: STATE_POSTACTIVE;
if (mClient) {
mClient->Inactivate(mFillMode == FILL_FREEZE);
}
mCurrentInterval->FixEnd();
if (mSeekState == SEEK_NOT_SEEKING) {
FireTimeEventAsync(NS_SMIL_END, 0);
}
mCurrentRepeatIteration = 0;
mOldIntervals.AppendElement(mCurrentInterval.forget());
// We must update mOldIntervals before calling SampleFillValue
SampleFillValue();
if (mElementState == STATE_WAITING) {
mCurrentInterval = new nsSMILInterval(newInterval);
NotifyNewInterval();
}
FilterHistory();
stateChanged = PR_TRUE;
} else {
nsSMILTime beginTime = mCurrentInterval->Begin()->Time().GetMillis();
NS_ASSERTION(aContainerTime >= beginTime,
"Sample time should not precede current interval");
nsSMILTime activeTime = aContainerTime - beginTime;
SampleSimpleTime(activeTime);
// We register our repeat times as milestones (except when we're
// seeking) so we should get a sample at exactly the time we repeat.
// (And even when we are seeking we want to update
// mCurrentRepeatIteration so we do that first before testing the seek
// state.)
PRUint32 prevRepeatIteration = mCurrentRepeatIteration;
if (ActiveTimeToSimpleTime(activeTime, mCurrentRepeatIteration)==0 &&
mCurrentRepeatIteration != prevRepeatIteration &&
mCurrentRepeatIteration &&
mSeekState == SEEK_NOT_SEEKING) {
FireTimeEventAsync(NS_SMIL_REPEAT,
static_cast<PRInt32>(mCurrentRepeatIteration));
}
}
}
break;
case STATE_POSTACTIVE:
break;
}
// Generally we continue driving the state machine so long as we have changed
// state. However, for end samples we only drive the state machine as far as
// the waiting or postactive state because we don't want to commit to any new
// interval (by transitioning to the active state) until all the end samples
// have finished and we then have complete information about the available
// instance times upon which to base our next interval.
} while (stateChanged && (!aEndOnly || (mElementState != STATE_WAITING &&
mElementState != STATE_POSTACTIVE)));
if (finishedSeek) {
DoPostSeek();
}
RegisterMilestone();
}
void
nsSMILTimedElement::HandleContainerTimeChange()
{
// In future we could possibly introduce a separate change notice for time
// container changes and only notify those dependents who live in other time
// containers. For now we don't bother because when we re-resolve the time in
// the nsSMILTimeValueSpec we'll check if anything has changed and if not, we
// won't go any further.
if (mElementState == STATE_WAITING || mElementState == STATE_ACTIVE) {
NotifyChangedInterval();
}
}
namespace
{
PRBool
RemoveNonDynamic(nsSMILInstanceTime* aInstanceTime)
{
// Generally dynamically-generated instance times (DOM calls, event-based
// times) are not associated with their creator nsSMILTimeValueSpec since
// they may outlive them.
NS_ABORT_IF_FALSE(!aInstanceTime->IsDynamic() ||
!aInstanceTime->GetCreator(),
"Dynamic instance time should be unlinked from its creator");
return !aInstanceTime->IsDynamic();
}
}
void
nsSMILTimedElement::Rewind()
{
NS_ABORT_IF_FALSE(mAnimationElement,
"Got rewind request before being attached to an animation element");
// It's possible to get a rewind request whilst we're already in the middle of
// a backwards seek. This can happen when we're performing tree surgery and
// seeking containers at the same time because we can end up requesting
// a local rewind on an element after binding it to a new container and then
// performing a rewind on that container as a whole without sampling in
// between.
//
// However, it should currently be impossible to get a rewind in the middle of
// a forwards seek since forwards seeks are detected and processed within the
// same (re)sample.
if (mSeekState == SEEK_NOT_SEEKING) {
mSeekState = mElementState == STATE_ACTIVE ?
SEEK_BACKWARD_FROM_ACTIVE :
SEEK_BACKWARD_FROM_INACTIVE;
}
NS_ABORT_IF_FALSE(mSeekState == SEEK_BACKWARD_FROM_INACTIVE ||
mSeekState == SEEK_BACKWARD_FROM_ACTIVE,
"Rewind in the middle of a forwards seek?");
ClearIntervalProgress();
UnsetBeginSpec(RemoveNonDynamic);
UnsetEndSpec(RemoveNonDynamic);
if (mClient) {
mClient->Inactivate(PR_FALSE);
}
if (mAnimationElement->HasAnimAttr(nsGkAtoms::begin)) {
nsAutoString attValue;
mAnimationElement->GetAnimAttr(nsGkAtoms::begin, attValue);
SetBeginSpec(attValue, &mAnimationElement->AsElement(), RemoveNonDynamic);
}
if (mAnimationElement->HasAnimAttr(nsGkAtoms::end)) {
nsAutoString attValue;
mAnimationElement->GetAnimAttr(nsGkAtoms::end, attValue);
SetEndSpec(attValue, &mAnimationElement->AsElement(), RemoveNonDynamic);
}
mPrevRegisteredMilestone = sMaxMilestone;
RegisterMilestone();
}
namespace
{
PRBool
RemoveNonDOM(nsSMILInstanceTime* aInstanceTime)
{
return !aInstanceTime->FromDOM();
}
}
PRBool
nsSMILTimedElement::SetAttr(nsIAtom* aAttribute, const nsAString& aValue,
nsAttrValue& aResult,
Element* aContextNode,
nsresult* aParseResult)
{
PRBool foundMatch = PR_TRUE;
nsresult parseResult = NS_OK;
if (aAttribute == nsGkAtoms::begin) {
parseResult = SetBeginSpec(aValue, aContextNode, RemoveNonDOM);
} else if (aAttribute == nsGkAtoms::dur) {
parseResult = SetSimpleDuration(aValue);
} else if (aAttribute == nsGkAtoms::end) {
parseResult = SetEndSpec(aValue, aContextNode, RemoveNonDOM);
} else if (aAttribute == nsGkAtoms::fill) {
parseResult = SetFillMode(aValue);
} else if (aAttribute == nsGkAtoms::max) {
parseResult = SetMax(aValue);
} else if (aAttribute == nsGkAtoms::min) {
parseResult = SetMin(aValue);
} else if (aAttribute == nsGkAtoms::repeatCount) {
parseResult = SetRepeatCount(aValue);
} else if (aAttribute == nsGkAtoms::repeatDur) {
parseResult = SetRepeatDur(aValue);
} else if (aAttribute == nsGkAtoms::restart) {
parseResult = SetRestart(aValue);
} else {
foundMatch = PR_FALSE;
}
if (foundMatch) {
aResult.SetTo(aValue);
if (aParseResult) {
*aParseResult = parseResult;
}
}
return foundMatch;
}
PRBool
nsSMILTimedElement::UnsetAttr(nsIAtom* aAttribute)
{
PRBool foundMatch = PR_TRUE;
if (aAttribute == nsGkAtoms::begin) {
UnsetBeginSpec(RemoveNonDOM);
} else if (aAttribute == nsGkAtoms::dur) {
UnsetSimpleDuration();
} else if (aAttribute == nsGkAtoms::end) {
UnsetEndSpec(RemoveNonDOM);
} else if (aAttribute == nsGkAtoms::fill) {
UnsetFillMode();
} else if (aAttribute == nsGkAtoms::max) {
UnsetMax();
} else if (aAttribute == nsGkAtoms::min) {
UnsetMin();
} else if (aAttribute == nsGkAtoms::repeatCount) {
UnsetRepeatCount();
} else if (aAttribute == nsGkAtoms::repeatDur) {
UnsetRepeatDur();
} else if (aAttribute == nsGkAtoms::restart) {
UnsetRestart();
} else {
foundMatch = PR_FALSE;
}
return foundMatch;
}
//----------------------------------------------------------------------
// Setters and unsetters
nsresult
nsSMILTimedElement::SetBeginSpec(const nsAString& aBeginSpec,
Element* aContextNode,
RemovalTestFunction aRemove)
{
return SetBeginOrEndSpec(aBeginSpec, aContextNode, PR_TRUE /*isBegin*/,
aRemove);
}
void
nsSMILTimedElement::UnsetBeginSpec(RemovalTestFunction aRemove)
{
ClearSpecs(mBeginSpecs, mBeginInstances, aRemove);
UpdateCurrentInterval();
}
nsresult
nsSMILTimedElement::SetEndSpec(const nsAString& aEndSpec,
Element* aContextNode,
RemovalTestFunction aRemove)
{
return SetBeginOrEndSpec(aEndSpec, aContextNode, PR_FALSE /*!isBegin*/,
aRemove);
}
void
nsSMILTimedElement::UnsetEndSpec(RemovalTestFunction aRemove)
{
ClearSpecs(mEndSpecs, mEndInstances, aRemove);
UpdateCurrentInterval();
}
nsresult
nsSMILTimedElement::SetSimpleDuration(const nsAString& aDurSpec)
{
nsSMILTimeValue duration;
PRBool isMedia;
nsresult rv;
rv = nsSMILParserUtils::ParseClockValue(aDurSpec, &duration,
nsSMILParserUtils::kClockValueAllowIndefinite, &isMedia);
if (NS_FAILED(rv)) {
mSimpleDur.SetIndefinite();
return NS_ERROR_FAILURE;
}
if (duration.IsResolved() && duration.GetMillis() == 0L) {
mSimpleDur.SetIndefinite();
return NS_ERROR_FAILURE;
}
//
// SVG-specific: "For SVG's animation elements, if "media" is specified, the
// attribute will be ignored." (SVG 1.1, section 19.2.6)
//
if (isMedia)
duration.SetIndefinite();
// mSimpleDur should never be unresolved. ParseClockValue will either set
// duration to resolved/indefinite/media or will return a failure code.
NS_ASSERTION(duration.IsResolved() || duration.IsIndefinite(),
"Setting unresolved simple duration");
mSimpleDur = duration;
UpdateCurrentInterval();
return NS_OK;
}
void
nsSMILTimedElement::UnsetSimpleDuration()
{
mSimpleDur.SetIndefinite();
UpdateCurrentInterval();
}
nsresult
nsSMILTimedElement::SetMin(const nsAString& aMinSpec)
{
nsSMILTimeValue duration;
PRBool isMedia;
nsresult rv;
rv = nsSMILParserUtils::ParseClockValue(aMinSpec, &duration, 0, &isMedia);
if (isMedia) {
duration.SetMillis(0L);
}
if (NS_FAILED(rv) || !duration.IsResolved()) {
mMin.SetMillis(0L);
return NS_ERROR_FAILURE;
}
if (duration.GetMillis() < 0L) {
mMin.SetMillis(0L);
return NS_ERROR_FAILURE;
}
mMin = duration;
UpdateCurrentInterval();
return NS_OK;
}
void
nsSMILTimedElement::UnsetMin()
{
mMin.SetMillis(0L);
UpdateCurrentInterval();
}
nsresult
nsSMILTimedElement::SetMax(const nsAString& aMaxSpec)
{
nsSMILTimeValue duration;
PRBool isMedia;
nsresult rv;
rv = nsSMILParserUtils::ParseClockValue(aMaxSpec, &duration,
nsSMILParserUtils::kClockValueAllowIndefinite, &isMedia);
if (isMedia)
duration.SetIndefinite();
if (NS_FAILED(rv) || (!duration.IsResolved() && !duration.IsIndefinite())) {
mMax.SetIndefinite();
return NS_ERROR_FAILURE;
}
if (duration.IsResolved() && duration.GetMillis() <= 0L) {
mMax.SetIndefinite();
return NS_ERROR_FAILURE;
}
mMax = duration;
UpdateCurrentInterval();
return NS_OK;
}
void
nsSMILTimedElement::UnsetMax()
{
mMax.SetIndefinite();
UpdateCurrentInterval();
}
nsresult
nsSMILTimedElement::SetRestart(const nsAString& aRestartSpec)
{
nsAttrValue temp;
PRBool parseResult
= temp.ParseEnumValue(aRestartSpec, sRestartModeTable, PR_TRUE);
mRestartMode = parseResult
? nsSMILRestartMode(temp.GetEnumValue())
: RESTART_ALWAYS;
UpdateCurrentInterval();
return parseResult ? NS_OK : NS_ERROR_FAILURE;
}
void
nsSMILTimedElement::UnsetRestart()
{
mRestartMode = RESTART_ALWAYS;
UpdateCurrentInterval();
}
nsresult
nsSMILTimedElement::SetRepeatCount(const nsAString& aRepeatCountSpec)
{
nsSMILRepeatCount newRepeatCount;
nsresult rv =
nsSMILParserUtils::ParseRepeatCount(aRepeatCountSpec, newRepeatCount);
if (NS_SUCCEEDED(rv)) {
mRepeatCount = newRepeatCount;
} else {
mRepeatCount.Unset();
}
UpdateCurrentInterval();
return rv;
}
void
nsSMILTimedElement::UnsetRepeatCount()
{
mRepeatCount.Unset();
UpdateCurrentInterval();
}
nsresult
nsSMILTimedElement::SetRepeatDur(const nsAString& aRepeatDurSpec)
{
nsresult rv;
nsSMILTimeValue duration;
rv = nsSMILParserUtils::ParseClockValue(aRepeatDurSpec, &duration,
nsSMILParserUtils::kClockValueAllowIndefinite);
if (NS_FAILED(rv) || (!duration.IsResolved() && !duration.IsIndefinite())) {
mRepeatDur.SetUnresolved();
return NS_ERROR_FAILURE;
}
mRepeatDur = duration;
UpdateCurrentInterval();
return NS_OK;
}
void
nsSMILTimedElement::UnsetRepeatDur()
{
mRepeatDur.SetUnresolved();
UpdateCurrentInterval();
}
nsresult
nsSMILTimedElement::SetFillMode(const nsAString& aFillModeSpec)
{
PRUint16 previousFillMode = mFillMode;
nsAttrValue temp;
PRBool parseResult =
temp.ParseEnumValue(aFillModeSpec, sFillModeTable, PR_TRUE);
mFillMode = parseResult
? nsSMILFillMode(temp.GetEnumValue())
: FILL_REMOVE;
// Check if we're in a fill-able state: i.e. we've played at least one
// interval and are now between intervals or at the end of all intervals
PRBool isFillable = HasPlayed() &&
(mElementState == STATE_WAITING || mElementState == STATE_POSTACTIVE);
if (mClient && mFillMode != previousFillMode && isFillable) {
mClient->Inactivate(mFillMode == FILL_FREEZE);
SampleFillValue();
}
return parseResult ? NS_OK : NS_ERROR_FAILURE;
}
void
nsSMILTimedElement::UnsetFillMode()
{
PRUint16 previousFillMode = mFillMode;
mFillMode = FILL_REMOVE;
if ((mElementState == STATE_WAITING || mElementState == STATE_POSTACTIVE) &&
previousFillMode == FILL_FREEZE && mClient && HasPlayed())
mClient->Inactivate(PR_FALSE);
}
void
nsSMILTimedElement::AddDependent(nsSMILTimeValueSpec& aDependent)
{
// There's probably no harm in attempting to register a dependent
// nsSMILTimeValueSpec twice, but we're not expecting it to happen.
NS_ABORT_IF_FALSE(!mTimeDependents.GetEntry(&aDependent),
"nsSMILTimeValueSpec is already registered as a dependency");
mTimeDependents.PutEntry(&aDependent);
// Add current interval. We could add historical intervals too but that would
// cause unpredictable results since some intervals may have been filtered.
// SMIL doesn't say what to do here so for simplicity and consistency we
// simply add the current interval if there is one.
//
// It's not necessary to call SyncPauseTime since we're dealing with
// historical instance times not newly added ones.
if (mCurrentInterval) {
aDependent.HandleNewInterval(*mCurrentInterval, GetTimeContainer());
}
}
void
nsSMILTimedElement::RemoveDependent(nsSMILTimeValueSpec& aDependent)
{
mTimeDependents.RemoveEntry(&aDependent);
}
PRBool
nsSMILTimedElement::IsTimeDependent(const nsSMILTimedElement& aOther) const
{
const nsSMILInstanceTime* thisBegin = GetEffectiveBeginInstance();
const nsSMILInstanceTime* otherBegin = aOther.GetEffectiveBeginInstance();
if (!thisBegin || !otherBegin)
return PR_FALSE;
return thisBegin->IsDependentOn(*otherBegin);
}
void
nsSMILTimedElement::BindToTree(nsIContent* aContextNode)
{
// Reset previously registered milestone since we may be registering with
// a different time container now.
mPrevRegisteredMilestone = sMaxMilestone;
// If we were already active then clear all our timing information and start
// afresh
if (mElementState != STATE_STARTUP) {
mSeekState = SEEK_NOT_SEEKING;
Rewind();
}
// Resolve references to other parts of the tree
PRUint32 count = mBeginSpecs.Length();
for (PRUint32 i = 0; i < count; ++i) {
mBeginSpecs[i]->ResolveReferences(aContextNode);
}
count = mEndSpecs.Length();
for (PRUint32 j = 0; j < count; ++j) {
mEndSpecs[j]->ResolveReferences(aContextNode);
}
RegisterMilestone();
}
void
nsSMILTimedElement::HandleTargetElementChange(Element* aNewTarget)
{
PRUint32 count = mBeginSpecs.Length();
for (PRUint32 i = 0; i < count; ++i) {
mBeginSpecs[i]->HandleTargetElementChange(aNewTarget);
}
count = mEndSpecs.Length();
for (PRUint32 j = 0; j < count; ++j) {
mEndSpecs[j]->HandleTargetElementChange(aNewTarget);
}
}
void
nsSMILTimedElement::Traverse(nsCycleCollectionTraversalCallback* aCallback)
{
PRUint32 count = mBeginSpecs.Length();
for (PRUint32 i = 0; i < count; ++i) {
nsSMILTimeValueSpec* beginSpec = mBeginSpecs[i];
NS_ABORT_IF_FALSE(beginSpec,
"null nsSMILTimeValueSpec in list of begin specs");
beginSpec->Traverse(aCallback);
}
count = mEndSpecs.Length();
for (PRUint32 j = 0; j < count; ++j) {
nsSMILTimeValueSpec* endSpec = mEndSpecs[j];
NS_ABORT_IF_FALSE(endSpec, "null nsSMILTimeValueSpec in list of end specs");
endSpec->Traverse(aCallback);
}
}
void
nsSMILTimedElement::Unlink()
{
PRUint32 count = mBeginSpecs.Length();
for (PRUint32 i = 0; i < count; ++i) {
nsSMILTimeValueSpec* beginSpec = mBeginSpecs[i];
NS_ABORT_IF_FALSE(beginSpec,
"null nsSMILTimeValueSpec in list of begin specs");
beginSpec->Unlink();
}
count = mEndSpecs.Length();
for (PRUint32 j = 0; j < count; ++j) {
nsSMILTimeValueSpec* endSpec = mEndSpecs[j];
NS_ABORT_IF_FALSE(endSpec, "null nsSMILTimeValueSpec in list of end specs");
endSpec->Unlink();
}
}
//----------------------------------------------------------------------
// Implementation helpers
nsresult
nsSMILTimedElement::SetBeginOrEndSpec(const nsAString& aSpec,
Element* aContextNode,
PRBool aIsBegin,
RemovalTestFunction aRemove)
{
PRInt32 start;
PRInt32 end = -1;
PRInt32 length;
nsresult rv = NS_OK;
TimeValueSpecList& timeSpecsList = aIsBegin ? mBeginSpecs : mEndSpecs;
InstanceTimeList& instances = aIsBegin ? mBeginInstances : mEndInstances;
ClearSpecs(timeSpecsList, instances, aRemove);
do {
start = end + 1;
end = aSpec.FindChar(';', start);
length = (end == -1) ? -1 : end - start;
nsAutoPtr<nsSMILTimeValueSpec>
spec(new nsSMILTimeValueSpec(*this, aIsBegin));
rv = spec->SetSpec(Substring(aSpec, start, length), aContextNode);
if (NS_SUCCEEDED(rv)) {
timeSpecsList.AppendElement(spec.forget());
}
} while (end != -1 && NS_SUCCEEDED(rv));
if (NS_FAILED(rv)) {
ClearSpecs(timeSpecsList, instances, aRemove);
}
UpdateCurrentInterval();
return rv;
}
namespace
{
// Adaptor functor for RemoveInstanceTimes that allows us to use function
// pointers instead.
// Without this we'd have to either templatize ClearSpecs and all its callers
// or pass bool flags around to specify which removal function to use here.
class RemoveByFunction
{
public:
RemoveByFunction(nsSMILTimedElement::RemovalTestFunction aFunction)
: mFunction(aFunction) { }
PRBool operator()(nsSMILInstanceTime* aInstanceTime, PRUint32 /*aIndex*/)
{
return mFunction(aInstanceTime);
}
private:
nsSMILTimedElement::RemovalTestFunction mFunction;
};
}
void
nsSMILTimedElement::ClearSpecs(TimeValueSpecList& aSpecs,
InstanceTimeList& aInstances,
RemovalTestFunction aRemove)
{
aSpecs.Clear();
RemoveByFunction removeByFunction(aRemove);
RemoveInstanceTimes(aInstances, removeByFunction);
}
void
nsSMILTimedElement::ClearIntervalProgress()
{
mElementState = STATE_STARTUP;
mCurrentRepeatIteration = 0;
ResetCurrentInterval();
// Remove old intervals
for (PRInt32 i = mOldIntervals.Length() - 1; i >= 0; --i) {
mOldIntervals[i]->Unlink();
}
mOldIntervals.Clear();
}
void
nsSMILTimedElement::ApplyEarlyEnd(const nsSMILTimeValue& aSampleTime)
{
// This should only be called within DoSampleAt as a helper function
NS_ABORT_IF_FALSE(mElementState == STATE_ACTIVE,
"Unexpected state to try to apply an early end");
// Only apply an early end if we're not already ending.
if (mCurrentInterval->End()->Time() > aSampleTime) {
nsSMILInstanceTime* earlyEnd = CheckForEarlyEnd(aSampleTime);
if (earlyEnd) {
if (earlyEnd->IsDependent()) {
// Generate a new instance time for the early end since the
// existing instance time is part of some dependency chain that we
// don't want to participate in.
nsRefPtr<nsSMILInstanceTime> newEarlyEnd =
new nsSMILInstanceTime(earlyEnd->Time());
mCurrentInterval->SetEnd(*newEarlyEnd);
} else {
mCurrentInterval->SetEnd(*earlyEnd);
}
NotifyChangedInterval();
}
}
}
namespace
{
class RemoveReset
{
public:
RemoveReset(const nsSMILInstanceTime* aCurrentIntervalBegin)
: mCurrentIntervalBegin(aCurrentIntervalBegin) { }
PRBool operator()(nsSMILInstanceTime* aInstanceTime, PRUint32 /*aIndex*/)
{
// SMIL 3.0 section 5.4.3, 'Resetting element state':
// Any instance times associated with past Event-values, Repeat-values,
// Accesskey-values or added via DOM method calls are removed from the
// dependent begin and end instance times lists. In effect, all events
// and DOM methods calls in the past are cleared. This does not apply to
// an instance time that defines the begin of the current interval.
return aInstanceTime->IsDynamic() &&
!aInstanceTime->ShouldPreserve() &&
(!mCurrentIntervalBegin || aInstanceTime != mCurrentIntervalBegin);
}
private:
const nsSMILInstanceTime* mCurrentIntervalBegin;
};
}
void
nsSMILTimedElement::Reset()
{
RemoveReset resetBegin(mCurrentInterval ? mCurrentInterval->Begin() : nsnull);
RemoveInstanceTimes(mBeginInstances, resetBegin);
RemoveReset resetEnd(nsnull);
RemoveInstanceTimes(mEndInstances, resetEnd);
}
void
nsSMILTimedElement::DoPostSeek()
{
// Finish backwards seek
if (mSeekState == SEEK_BACKWARD_FROM_INACTIVE ||
mSeekState == SEEK_BACKWARD_FROM_ACTIVE) {
// Previously some dynamic instance times may have been marked to be
// preserved because they were endpoints of an historic interval (which may
// or may not have been filtered). Now that we've finished a seek we should
// clear that flag for those instance times whose intervals are no longer
// historic.
UnpreserveInstanceTimes(mBeginInstances);
UnpreserveInstanceTimes(mEndInstances);
// Now that the times have been unmarked perform a reset. This might seem
// counter-intuitive when we're only doing a seek within an interval but
// SMIL seems to require this. SMIL 3.0, 'Hyperlinks and timing':
// Resolved end times associated with events, Repeat-values,
// Accesskey-values or added via DOM method calls are cleared when seeking
// to time earlier than the resolved end time.
Reset();
UpdateCurrentInterval();
}
switch (mSeekState)
{
case SEEK_FORWARD_FROM_ACTIVE:
case SEEK_BACKWARD_FROM_ACTIVE:
if (mElementState != STATE_ACTIVE) {
FireTimeEventAsync(NS_SMIL_END, 0);
}
break;
case SEEK_FORWARD_FROM_INACTIVE:
case SEEK_BACKWARD_FROM_INACTIVE:
if (mElementState == STATE_ACTIVE) {
FireTimeEventAsync(NS_SMIL_BEGIN, 0);
}
break;
case SEEK_NOT_SEEKING:
/* Do nothing */
break;
}
mSeekState = SEEK_NOT_SEEKING;
}
void
nsSMILTimedElement::UnpreserveInstanceTimes(InstanceTimeList& aList)
{
const nsSMILInterval* prevInterval = GetPreviousInterval();
const nsSMILInstanceTime* cutoff = mCurrentInterval ?
mCurrentInterval->Begin() :
prevInterval ? prevInterval->Begin() : nsnull;
PRUint32 count = aList.Length();
for (PRUint32 i = 0; i < count; ++i) {
nsSMILInstanceTime* instance = aList[i].get();
if (!cutoff || cutoff->Time().CompareTo(instance->Time()) < 0) {
instance->UnmarkShouldPreserve();
}
}
}
void
nsSMILTimedElement::FilterHistory()
{
// We should filter the intervals first, since instance times still used in an
// interval won't be filtered.
FilterIntervals();
FilterInstanceTimes(mBeginInstances);
FilterInstanceTimes(mEndInstances);
}
void
nsSMILTimedElement::FilterIntervals()
{
// We can filter old intervals that:
//
// a) are not the previous interval; AND
// b) are not in the middle of a dependency chain
//
// Condition (a) is necessary since the previous interval is used for applying
// fill effects and updating the current interval.
//
// Condition (b) is necessary since even if this interval itself is not
// active, it may be part of a dependency chain that includes active
// intervals. Such chains are used to establish priorities within the
// animation sandwich.
//
// Although the above conditions allow us to safely filter intervals for most
// scenarios they do not cover all cases and there will still be scenarios
// that generate intervals indefinitely. In such a case we simply set
// a maximum number of intervals and drop any intervals beyond that threshold.
PRUint32 threshold = mOldIntervals.Length() > sMaxNumIntervals ?
mOldIntervals.Length() - sMaxNumIntervals :
0;
IntervalList filteredList;
for (PRUint32 i = 0; i < mOldIntervals.Length(); ++i)
{
nsSMILInterval* interval = mOldIntervals[i].get();
if (i + 1 < mOldIntervals.Length() /*skip previous interval*/ &&
(i < threshold || !interval->IsDependencyChainLink())) {
interval->Unlink(PR_TRUE /*filtered, not deleted*/);
} else {
filteredList.AppendElement(mOldIntervals[i].forget());
}
}
mOldIntervals.Clear();
mOldIntervals.SwapElements(filteredList);
}
namespace
{
class RemoveFiltered
{
public:
RemoveFiltered(nsSMILTimeValue aCutoff) : mCutoff(aCutoff) { }
PRBool operator()(nsSMILInstanceTime* aInstanceTime, PRUint32 /*aIndex*/)
{
// We can filter instance times that:
// a) Precede the end point of the previous interval; AND
// b) Are NOT syncbase times that might be updated to a time after the end
// point of the previous interval; AND
// c) Are NOT fixed end points in any remaining interval.
return aInstanceTime->Time() < mCutoff &&
aInstanceTime->IsFixedTime() &&
!aInstanceTime->ShouldPreserve();
}
private:
nsSMILTimeValue mCutoff;
};
class RemoveBelowThreshold
{
public:
RemoveBelowThreshold(PRUint32 aThreshold,
const nsSMILInstanceTime* aCurrentIntervalBegin)
: mThreshold(aThreshold),
mCurrentIntervalBegin(aCurrentIntervalBegin) { }
PRBool operator()(nsSMILInstanceTime* aInstanceTime, PRUint32 aIndex)
{
return aInstanceTime != mCurrentIntervalBegin && aIndex < mThreshold;
}
private:
PRUint32 mThreshold;
const nsSMILInstanceTime* mCurrentIntervalBegin;
};
}
void
nsSMILTimedElement::FilterInstanceTimes(InstanceTimeList& aList)
{
if (GetPreviousInterval()) {
RemoveFiltered removeFiltered(GetPreviousInterval()->End()->Time());
RemoveInstanceTimes(aList, removeFiltered);
}
// As with intervals it is possible to create a document that, even despite
// our most aggressive filtering, will generate instance times indefinitely
// (e.g. cyclic dependencies with TimeEvents---we can't filter such times as
// they're unpredictable due to the possibility of seeking the document which
// may prevent some events from being generated). Therefore we introduce
// a hard cutoff at which point we just drop the oldest instance times.
if (aList.Length() > sMaxNumInstanceTimes) {
PRUint32 threshold = aList.Length() - sMaxNumInstanceTimes;
// We should still preserve the current interval begin time however
const nsSMILInstanceTime* currentIntervalBegin = mCurrentInterval ?
mCurrentInterval->Begin() : nsnull;
RemoveBelowThreshold removeBelowThreshold(threshold, currentIntervalBegin);
RemoveInstanceTimes(aList, removeBelowThreshold);
}
}
//
// This method is based on the pseudocode given in the SMILANIM spec.
//
// See:
// http://www.w3.org/TR/2001/REC-smil-animation-20010904/#Timing-BeginEnd-LC-Start
//
nsresult
nsSMILTimedElement::GetNextInterval(const nsSMILInterval* aPrevInterval,
const nsSMILInstanceTime* aFixedBeginTime,
nsSMILInterval& aResult) const
{
NS_ABORT_IF_FALSE(!aFixedBeginTime || aFixedBeginTime->Time().IsResolved(),
"Unresolved begin time specified for interval start");
static nsSMILTimeValue zeroTime(0L);
if (mRestartMode == RESTART_NEVER && aPrevInterval)
return NS_ERROR_FAILURE;
// Calc starting point
nsSMILTimeValue beginAfter;
PRBool prevIntervalWasZeroDur = PR_FALSE;
if (aPrevInterval) {
beginAfter = aPrevInterval->End()->Time();
prevIntervalWasZeroDur
= aPrevInterval->End()->Time() == aPrevInterval->Begin()->Time();
if (aFixedBeginTime) {
prevIntervalWasZeroDur &=
aPrevInterval->Begin()->Time() == aFixedBeginTime->Time();
}
} else {
beginAfter.SetMillis(LL_MININT);
}
nsRefPtr<nsSMILInstanceTime> tempBegin;
nsRefPtr<nsSMILInstanceTime> tempEnd;
while (PR_TRUE) {
// Calculate begin time
if (aFixedBeginTime) {
if (aFixedBeginTime->Time() < beginAfter)
return NS_ERROR_FAILURE;
// our ref-counting is not const-correct
tempBegin = const_cast<nsSMILInstanceTime*>(aFixedBeginTime);
} else if ((!mAnimationElement ||
!mAnimationElement->HasAnimAttr(nsGkAtoms::begin)) &&
beginAfter <= zeroTime) {
tempBegin = new nsSMILInstanceTime(nsSMILTimeValue(0));
} else {
PRInt32 beginPos = 0;
tempBegin = GetNextGreaterOrEqual(mBeginInstances, beginAfter, beginPos);
if (!tempBegin || !tempBegin->Time().IsResolved())
return NS_ERROR_FAILURE;
}
NS_ABORT_IF_FALSE(tempBegin && tempBegin->Time().IsResolved() &&
tempBegin->Time() >= beginAfter,
"Got a bad begin time while fetching next interval");
// Calculate end time
{
PRInt32 endPos = 0;
tempEnd = GetNextGreaterOrEqual(mEndInstances, tempBegin->Time(), endPos);
// If the last interval ended at the same point and was zero-duration and
// this one is too, look for another end to use instead
if (tempEnd && tempEnd->Time() == tempBegin->Time() &&
prevIntervalWasZeroDur) {
tempEnd = GetNextGreater(mEndInstances, tempBegin->Time(), endPos);
}
// If all the ends are before the beginning we have a bad interval UNLESS:
// a) We never had any end attribute to begin with (and hence we should
// just use the active duration after allowing for the possibility of
// an end instance provided by a DOM call), OR
// b) We have an end attribute but no end instances--this is a special
// case that is needed for syncbase timing so that animations of the
// following sort: <animate id="a" end="a.begin+1s" ... /> can be
// resolved (see SVGT 1.2 Test Suite animate-elem-221-t.svg) by first
// establishing an interval of unresolved duration, OR
// c) We have end events which leave the interval open-ended.
PRBool openEndedIntervalOk = mEndSpecs.IsEmpty() ||
mEndInstances.IsEmpty() ||
EndHasEventConditions();
if (!tempEnd && !openEndedIntervalOk)
return NS_ERROR_FAILURE; // Bad interval
nsSMILTimeValue intervalEnd = tempEnd
? tempEnd->Time() : nsSMILTimeValue();
nsSMILTimeValue activeEnd = CalcActiveEnd(tempBegin->Time(), intervalEnd);
if (!tempEnd || intervalEnd != activeEnd) {
tempEnd = new nsSMILInstanceTime(activeEnd);
}
}
NS_ABORT_IF_FALSE(tempEnd, "Failed to get end point for next interval");
// If we get two zero-length intervals in a row we will potentially have an
// infinite loop so we break it here by searching for the next begin time
// greater than tempEnd on the next time around.
if (tempEnd->Time().IsResolved() && tempBegin->Time() == tempEnd->Time()) {
if (prevIntervalWasZeroDur) {
beginAfter.SetMillis(tempEnd->Time().GetMillis() + 1);
prevIntervalWasZeroDur = PR_FALSE;
continue;
}
prevIntervalWasZeroDur = PR_TRUE;
}
// Check for valid interval
if (tempEnd->Time() > zeroTime ||
(tempBegin->Time() == zeroTime && tempEnd->Time() == zeroTime)) {
aResult.Set(*tempBegin, *tempEnd);
return NS_OK;
}
if (mRestartMode == RESTART_NEVER) {
// tempEnd <= 0 so we're going to loop which effectively means restarting
return NS_ERROR_FAILURE;
}
beginAfter = tempEnd->Time();
}
NS_NOTREACHED("Hmm... we really shouldn't be here");
return NS_ERROR_FAILURE;
}
nsSMILInstanceTime*
nsSMILTimedElement::GetNextGreater(const InstanceTimeList& aList,
const nsSMILTimeValue& aBase,
PRInt32& aPosition) const
{
nsSMILInstanceTime* result = nsnull;
while ((result = GetNextGreaterOrEqual(aList, aBase, aPosition)) &&
result->Time() == aBase);
return result;
}
nsSMILInstanceTime*
nsSMILTimedElement::GetNextGreaterOrEqual(const InstanceTimeList& aList,
const nsSMILTimeValue& aBase,
PRInt32& aPosition) const
{
nsSMILInstanceTime* result = nsnull;
PRInt32 count = aList.Length();
for (; aPosition < count && !result; ++aPosition) {
nsSMILInstanceTime* val = aList[aPosition].get();
NS_ABORT_IF_FALSE(val, "NULL instance time in list");
if (val->Time() >= aBase) {
result = val;
}
}
return result;
}
/**
* @see SMILANIM 3.3.4
*/
nsSMILTimeValue
nsSMILTimedElement::CalcActiveEnd(const nsSMILTimeValue& aBegin,
const nsSMILTimeValue& aEnd) const
{
nsSMILTimeValue result;
NS_ABORT_IF_FALSE(mSimpleDur.IsResolved() || mSimpleDur.IsIndefinite(),
"Unresolved simple duration in CalcActiveEnd");
NS_ABORT_IF_FALSE(aBegin.IsResolved(),
"Unresolved begin time in CalcActiveEnd");
if (mRepeatDur.IsIndefinite()) {
result.SetIndefinite();
} else {
result = GetRepeatDuration();
}
if (aEnd.IsResolved()) {
nsSMILTime activeDur = aEnd.GetMillis() - aBegin.GetMillis();
if (result.IsResolved()) {
result.SetMillis(NS_MIN(result.GetMillis(), activeDur));
} else {
result.SetMillis(activeDur);
}
}
result = ApplyMinAndMax(result);
if (result.IsResolved()) {
nsSMILTime activeEnd = result.GetMillis() + aBegin.GetMillis();
result.SetMillis(activeEnd);
}
return result;
}
nsSMILTimeValue
nsSMILTimedElement::GetRepeatDuration() const
{
nsSMILTimeValue result;
if (mRepeatCount.IsDefinite() && mRepeatDur.IsResolved()) {
if (mSimpleDur.IsResolved()) {
nsSMILTime activeDur =
nsSMILTime(mRepeatCount * double(mSimpleDur.GetMillis()));
result.SetMillis(NS_MIN(activeDur, mRepeatDur.GetMillis()));
} else {
result = mRepeatDur;
}
} else if (mRepeatCount.IsDefinite() && mSimpleDur.IsResolved()) {
nsSMILTime activeDur =
nsSMILTime(mRepeatCount * double(mSimpleDur.GetMillis()));
result.SetMillis(activeDur);
} else if (mRepeatDur.IsResolved()) {
result = mRepeatDur;
} else if (mRepeatCount.IsIndefinite()) {
result.SetIndefinite();
} else {
result = mSimpleDur;
}
return result;
}
nsSMILTimeValue
nsSMILTimedElement::ApplyMinAndMax(const nsSMILTimeValue& aDuration) const
{
if (!aDuration.IsResolved() && !aDuration.IsIndefinite()) {
return aDuration;
}
if (mMax < mMin) {
return aDuration;
}
nsSMILTimeValue result;
if (aDuration > mMax) {
result = mMax;
} else if (aDuration < mMin) {
nsSMILTimeValue repeatDur = GetRepeatDuration();
result = mMin > repeatDur ? repeatDur : mMin;
} else {
result = aDuration;
}
return result;
}
nsSMILTime
nsSMILTimedElement::ActiveTimeToSimpleTime(nsSMILTime aActiveTime,
PRUint32& aRepeatIteration)
{
nsSMILTime result;
NS_ASSERTION(mSimpleDur.IsResolved() || mSimpleDur.IsIndefinite(),
"Unresolved simple duration in ActiveTimeToSimpleTime");
NS_ASSERTION(aActiveTime >= 0, "Expecting non-negative active time");
// Note that a negative aActiveTime will give us a negative value for
// aRepeatIteration, which is bad because aRepeatIteration is unsigned
if (mSimpleDur.IsIndefinite() || mSimpleDur.GetMillis() == 0L) {
aRepeatIteration = 0;
result = aActiveTime;
} else {
result = aActiveTime % mSimpleDur.GetMillis();
aRepeatIteration = (PRUint32)(aActiveTime / mSimpleDur.GetMillis());
}
return result;
}
//
// Although in many cases it would be possible to check for an early end and
// adjust the current interval well in advance the SMIL Animation spec seems to
// indicate that we should only apply an early end at the latest possible
// moment. In particular, this paragraph from section 3.6.8:
//
// 'If restart is set to "always", then the current interval will end early if
// there is an instance time in the begin list that is before (i.e. earlier
// than) the defined end for the current interval. Ending in this manner will
// also send a changed time notice to all time dependents for the current
// interval end.'
//
nsSMILInstanceTime*
nsSMILTimedElement::CheckForEarlyEnd(
const nsSMILTimeValue& aContainerTime) const
{
NS_ABORT_IF_FALSE(mCurrentInterval,
"Checking for an early end but the current interval is not set");
if (mRestartMode != RESTART_ALWAYS)
return nsnull;
PRInt32 position = 0;
nsSMILInstanceTime* nextBegin =
GetNextGreater(mBeginInstances, mCurrentInterval->Begin()->Time(),
position);
if (nextBegin &&
nextBegin->Time() > mCurrentInterval->Begin()->Time() &&
nextBegin->Time() < mCurrentInterval->End()->Time() &&
nextBegin->Time() <= aContainerTime) {
return nextBegin;
}
return nsnull;
}
void
nsSMILTimedElement::UpdateCurrentInterval(PRBool aForceChangeNotice)
{
// We adopt the convention of not resolving intervals until the first
// sample. Otherwise, every time each attribute is set we'll re-resolve the
// current interval and notify all our time dependents of the change.
//
// The disadvantage of deferring resolving the interval is that DOM calls to
// to getStartTime will throw an INVALID_STATE_ERR exception until the
// document timeline begins since the start time has not yet been resolved.
if (mElementState == STATE_STARTUP)
return;
// If the interval is active the begin time is fixed.
const nsSMILInstanceTime* beginTime = mElementState == STATE_ACTIVE
? mCurrentInterval->Begin()
: nsnull;
nsSMILInterval updatedInterval;
nsresult rv =
GetNextInterval(GetPreviousInterval(), beginTime, updatedInterval);
if (NS_SUCCEEDED(rv)) {
if (mElementState == STATE_POSTACTIVE) {
NS_ABORT_IF_FALSE(!mCurrentInterval,
"In postactive state but the interval has been set");
mCurrentInterval = new nsSMILInterval(updatedInterval);
mElementState = STATE_WAITING;
NotifyNewInterval();
} else {
PRBool changed = PR_FALSE;
if (mElementState != STATE_ACTIVE &&
!updatedInterval.Begin()->SameTimeAndBase(
*mCurrentInterval->Begin())) {
mCurrentInterval->SetBegin(*updatedInterval.Begin());
changed = PR_TRUE;
}
if (!updatedInterval.End()->SameTimeAndBase(*mCurrentInterval->End())) {
mCurrentInterval->SetEnd(*updatedInterval.End());
changed = PR_TRUE;
}
if (changed || aForceChangeNotice) {
NotifyChangedInterval();
}
}
// There's a chance our next milestone has now changed, so update the time
// container
RegisterMilestone();
} else { // GetNextInterval failed: Current interval is no longer valid
if (mElementState == STATE_ACTIVE) {
// The interval is active so we can't just delete it, instead trim it so
// that begin==end.
if (!mCurrentInterval->End()->SameTimeAndBase(*mCurrentInterval->Begin()))
{
mCurrentInterval->SetEnd(*mCurrentInterval->Begin());
NotifyChangedInterval();
}
// The transition to the postactive state will take place on the next
// sample (along with firing end events, clearing intervals etc.)
RegisterMilestone();
} else if (mElementState == STATE_WAITING) {
mElementState = STATE_POSTACTIVE;
ResetCurrentInterval();
}
}
}
void
nsSMILTimedElement::SampleSimpleTime(nsSMILTime aActiveTime)
{
if (mClient) {
PRUint32 repeatIteration;
nsSMILTime simpleTime =
ActiveTimeToSimpleTime(aActiveTime, repeatIteration);
mClient->SampleAt(simpleTime, mSimpleDur, repeatIteration);
}
}
void
nsSMILTimedElement::SampleFillValue()
{
if (mFillMode != FILL_FREEZE || !mClient)
return;
const nsSMILInterval* prevInterval = GetPreviousInterval();
NS_ABORT_IF_FALSE(prevInterval,
"Attempting to sample fill value but there is no previous interval");
NS_ABORT_IF_FALSE(prevInterval->End()->Time().IsResolved() &&
prevInterval->End()->IsFixedTime(),
"Attempting to sample fill value but the endpoint of the previous "
"interval is not resolved and fixed");
nsSMILTime activeTime = prevInterval->End()->Time().GetMillis() -
prevInterval->Begin()->Time().GetMillis();
PRUint32 repeatIteration;
nsSMILTime simpleTime =
ActiveTimeToSimpleTime(activeTime, repeatIteration);
if (simpleTime == 0L && repeatIteration) {
mClient->SampleLastValue(--repeatIteration);
} else {
mClient->SampleAt(simpleTime, mSimpleDur, repeatIteration);
}
}
void
nsSMILTimedElement::AddInstanceTimeFromCurrentTime(nsSMILTime aCurrentTime,
double aOffsetSeconds, PRBool aIsBegin)
{
double offset = aOffsetSeconds * PR_MSEC_PER_SEC;
nsSMILTime timeWithOffset = aCurrentTime + PRInt64(NS_round(offset));
nsSMILTimeValue timeVal(timeWithOffset);
nsRefPtr<nsSMILInstanceTime> instanceTime =
new nsSMILInstanceTime(timeVal, nsSMILInstanceTime::SOURCE_DOM);
AddInstanceTime(instanceTime, aIsBegin);
}
void
nsSMILTimedElement::RegisterMilestone()
{
nsSMILTimeContainer* container = GetTimeContainer();
if (!container)
return;
NS_ABORT_IF_FALSE(mAnimationElement,
"Got a time container without an owning animation element");
nsSMILMilestone nextMilestone;
if (!GetNextMilestone(nextMilestone))
return;
// This method is called every time we might possibly have updated our
// current interval, but since nsSMILTimeContainer makes no attempt to filter
// out redundant milestones we do some rudimentary filtering here. It's not
// perfect, but unnecessary samples are fairly cheap.
if (nextMilestone >= mPrevRegisteredMilestone)
return;
container->AddMilestone(nextMilestone, *mAnimationElement);
mPrevRegisteredMilestone = nextMilestone;
}
PRBool
nsSMILTimedElement::GetNextMilestone(nsSMILMilestone& aNextMilestone) const
{
// Return the next key moment in our lifetime.
//
// XXX It may be possible in future to optimise this so that we only register
// for milestones if:
// a) We have time dependents, or
// b) We are dependent on events or syncbase relationships, or
// c) There are registered listeners for our events
//
// Then for the simple case where everything uses offset values we could
// ignore milestones altogether.
//
// We'd need to be careful, however, that if one of those conditions became
// true in between samples that we registered our next milestone at that
// point.
switch (mElementState)
{
case STATE_STARTUP:
// All elements register for an initial end sample at t=0 where we resolve
// our initial interval.
aNextMilestone.mIsEnd = PR_TRUE; // Initial sample should be an end sample
aNextMilestone.mTime = 0;
return PR_TRUE;
case STATE_WAITING:
NS_ABORT_IF_FALSE(mCurrentInterval,
"In waiting state but the current interval has not been set");
aNextMilestone.mIsEnd = PR_FALSE;
aNextMilestone.mTime = mCurrentInterval->Begin()->Time().GetMillis();
return PR_TRUE;
case STATE_ACTIVE:
{
// Work out what comes next: the interval end or the next repeat iteration
nsSMILTimeValue nextRepeat;
if (mSeekState == SEEK_NOT_SEEKING && mSimpleDur.IsResolved()) {
nextRepeat.SetMillis(mCurrentInterval->Begin()->Time().GetMillis() +
(mCurrentRepeatIteration + 1) * mSimpleDur.GetMillis());
}
nsSMILTimeValue nextMilestone =
NS_MIN(mCurrentInterval->End()->Time(), nextRepeat);
// Check for an early end before that time
nsSMILInstanceTime* earlyEnd = CheckForEarlyEnd(nextMilestone);
if (earlyEnd) {
aNextMilestone.mIsEnd = PR_TRUE;
aNextMilestone.mTime = earlyEnd->Time().GetMillis();
return PR_TRUE;
}
// Apply the previously calculated milestone
if (nextMilestone.IsResolved()) {
aNextMilestone.mIsEnd = nextMilestone != nextRepeat;
aNextMilestone.mTime = nextMilestone.GetMillis();
return PR_TRUE;
}
return PR_FALSE;
}
case STATE_POSTACTIVE:
return PR_FALSE;
default:
NS_ABORT_IF_FALSE(PR_FALSE, "Invalid element state");
return PR_FALSE;
}
}
void
nsSMILTimedElement::NotifyNewInterval()
{
NS_ABORT_IF_FALSE(mCurrentInterval,
"Attempting to notify dependents of a new interval but the interval "
"is not set");
nsSMILTimeContainer* container = GetTimeContainer();
if (container) {
container->SyncPauseTime();
}
NotifyTimeDependentsParams params = { mCurrentInterval, container };
mTimeDependents.EnumerateEntries(NotifyNewIntervalCallback, &params);
}
void
nsSMILTimedElement::NotifyChangedInterval()
{
NS_ABORT_IF_FALSE(mCurrentInterval,
"Attempting to notify dependents of a changed interval but the interval "
"is not set--perhaps we should be deleting the interval instead?");
nsSMILTimeContainer* container = GetTimeContainer();
if (container) {
container->SyncPauseTime();
}
mCurrentInterval->NotifyChanged(container);
}
void
nsSMILTimedElement::FireTimeEventAsync(PRUint32 aMsg, PRInt32 aDetail)
{
if (!mAnimationElement)
return;
nsCOMPtr<nsIRunnable> event =
new AsyncTimeEventRunner(&mAnimationElement->AsElement(), aMsg, aDetail);
NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
}
const nsSMILInstanceTime*
nsSMILTimedElement::GetEffectiveBeginInstance() const
{
switch (mElementState)
{
case STATE_STARTUP:
return nsnull;
case STATE_ACTIVE:
return mCurrentInterval->Begin();
case STATE_WAITING:
case STATE_POSTACTIVE:
{
const nsSMILInterval* prevInterval = GetPreviousInterval();
return prevInterval ? prevInterval->Begin() : nsnull;
}
default:
NS_NOTREACHED("Invalid element state");
return nsnull;
}
}
const nsSMILInterval*
nsSMILTimedElement::GetPreviousInterval() const
{
return mOldIntervals.IsEmpty()
? nsnull
: mOldIntervals[mOldIntervals.Length()-1].get();
}
PRBool
nsSMILTimedElement::EndHasEventConditions() const
{
for (PRUint32 i = 0; i < mEndSpecs.Length(); ++i) {
if (mEndSpecs[i]->IsEventBased())
return PR_TRUE;
}
return PR_FALSE;
}
//----------------------------------------------------------------------
// Hashtable callback functions
/* static */ PR_CALLBACK PLDHashOperator
nsSMILTimedElement::NotifyNewIntervalCallback(TimeValueSpecPtrKey* aKey,
void* aData)
{
NS_ABORT_IF_FALSE(aKey, "Null hash key for time container hash table");
NS_ABORT_IF_FALSE(aKey->GetKey(),
"null nsSMILTimeValueSpec in set of time dependents");
NotifyTimeDependentsParams* params =
static_cast<NotifyTimeDependentsParams*>(aData);
NS_ABORT_IF_FALSE(params, "null data ptr while enumerating hashtable");
NS_ABORT_IF_FALSE(params->mCurrentInterval, "null current-interval ptr");
nsSMILTimeValueSpec* spec = aKey->GetKey();
spec->HandleNewInterval(*params->mCurrentInterval, params->mTimeContainer);
return PL_DHASH_NEXT;
}
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