Source/WebCore/page/animation/KeyframeAnimation.cpp - platform/external/webkit - Git at Google

 /*
  * Copyright (C) 2007 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
  * 2.  Redistributions in binary form must reproduce the above copyright
  *     notice, this list of conditions and the following disclaimer in the
  *     documentation and/or other materials provided with the distribution.
  * 3.  Neither the name of Apple Computer, Inc. ("Apple") nor the names of
  *     its contributors may be used to endorse or promote products derived
  *     from this software without specific prior written permission.
  *
  * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */

 #include "config.h"
 #include "KeyframeAnimation.h"

 #include "AnimationControllerPrivate.h"
 #include "CSSPropertyNames.h"
 #include "CSSStyleSelector.h"
 #include "CompositeAnimation.h"
 #include "EventNames.h"
 #include "RenderLayer.h"
 #include "RenderLayerBacking.h"
 #include "RenderStyle.h"
 #include <wtf/UnusedParam.h>

 using namespace std;

 namespace WebCore {

 KeyframeAnimation::KeyframeAnimation(const Animation* animation, RenderObject* renderer, int index, CompositeAnimation* compAnim, RenderStyle* unanimatedStyle)
     : AnimationBase(animation, renderer, compAnim)
     , m_keyframes(renderer, animation->name())
     , m_index(index)
     , m_startEventDispatched(false)
     , m_unanimatedStyle(unanimatedStyle)
 {
     // Get the keyframe RenderStyles
     if (m_object && m_object->node() && m_object->node()->isElementNode())
         m_object->document()->styleSelector()->keyframeStylesForAnimation(static_cast<Element*>(m_object->node()), unanimatedStyle, m_keyframes);

     // Update the m_transformFunctionListValid flag based on whether the function lists in the keyframes match.
     validateTransformFunctionList();
 }

 KeyframeAnimation::~KeyframeAnimation()
 {
     // Make sure to tell the renderer that we are ending. This will make sure any accelerated animations are removed.
     if (!postActive())
         endAnimation();
 }

 void KeyframeAnimation::fetchIntervalEndpointsForProperty(int property, const RenderStyle*& fromStyle, const RenderStyle*& toStyle, double& prog) const
 {
     // Find the first key
     double elapsedTime = getElapsedTime();
     if (m_animation->duration() && m_animation->iterationCount() != Animation::IterationCountInfinite)
         elapsedTime = min(elapsedTime, m_animation->duration() * m_animation->iterationCount());

     double fractionalTime = m_animation->duration() ? (elapsedTime / m_animation->duration()) : 1;

     // FIXME: startTime can be before the current animation "frame" time. This is to sync with the frame time
     // concept in AnimationTimeController. So we need to somehow sync the two. Until then, the possible
     // error is small and will probably not be noticeable. Until we fix this, remove the assert.
     // https://bugs.webkit.org/show_bug.cgi?id=52037
     // ASSERT(fractionalTime >= 0);
     if (fractionalTime < 0)
         fractionalTime = 0;

     // FIXME: share this code with AnimationBase::progress().
     int iteration = static_cast<int>(fractionalTime);
     if (m_animation->iterationCount() != Animation::IterationCountInfinite)
         iteration = min(iteration, m_animation->iterationCount() - 1);
     fractionalTime -= iteration;

     bool reversing = (m_animation->direction() == Animation::AnimationDirectionAlternate) && (iteration & 1);
     if (reversing)
         fractionalTime = 1 - fractionalTime;

     size_t numKeyframes = m_keyframes.size();
     if (!numKeyframes)
         return;

     ASSERT(!m_keyframes[0].key());
     ASSERT(m_keyframes[m_keyframes.size() - 1].key() == 1);

     int prevIndex = -1;
     int nextIndex = -1;

     // FIXME: with a lot of keys, this linear search will be slow. We could binary search.
     for (size_t i = 0; i < numKeyframes; ++i) {
         const KeyframeValue& currKeyFrame = m_keyframes[i];

         if (!currKeyFrame.containsProperty(property))
             continue;

         if (fractionalTime < currKeyFrame.key()) {
             nextIndex = i;
             break;
         }

         prevIndex = i;
     }

     double scale = 1;
     double offset = 0;

     if (prevIndex == -1)
         prevIndex = 0;

     if (nextIndex == -1)
         nextIndex = m_keyframes.size() - 1;

     const KeyframeValue& prevKeyframe = m_keyframes[prevIndex];
     const KeyframeValue& nextKeyframe = m_keyframes[nextIndex];

     fromStyle = prevKeyframe.style();
     toStyle = nextKeyframe.style();

     offset = prevKeyframe.key();
     scale = 1.0 / (nextKeyframe.key() - prevKeyframe.key());

     const TimingFunction* timingFunction = 0;
     if (fromStyle->animations() && fromStyle->animations()->size() > 0) {
         // We get the timing function from the first animation, because we've synthesized a RenderStyle for each keyframe.
         timingFunction = fromStyle->animations()->animation(0)->timingFunction().get();
     }

     prog = progress(scale, offset, timingFunction);
 }

 void KeyframeAnimation::animate(CompositeAnimation*, RenderObject*, const RenderStyle*, RenderStyle* targetStyle, RefPtr<RenderStyle>& animatedStyle)
 {
     // Fire the start timeout if needed
     fireAnimationEventsIfNeeded();

     // If we have not yet started, we will not have a valid start time, so just start the animation if needed.
     if (isNew() && m_animation->playState() == AnimPlayStatePlaying)
         updateStateMachine(AnimationStateInputStartAnimation, -1);

     // If we get this far and the animation is done, it means we are cleaning up a just finished animation.
     // If so, we need to send back the targetStyle.
     if (postActive()) {
         if (!animatedStyle)
             animatedStyle = const_cast<RenderStyle*>(targetStyle);
         return;
     }

     // If we are waiting for the start timer, we don't want to change the style yet.
     // Special case 1 - if the delay time is 0, then we do want to set the first frame of the
     // animation right away. This avoids a flash when the animation starts.
     // Special case 2 - if there is a backwards fill mode, then we want to continue
     // through to the style blend so that we get the fromStyle.
     if (waitingToStart() && m_animation->delay() > 0 && !m_animation->fillsBackwards())
         return;

     // If we have no keyframes, don't animate.
     if (!m_keyframes.size()) {
         updateStateMachine(AnimationStateInputEndAnimation, -1);
         return;
     }

     // Run a cycle of animation.
     // We know we will need a new render style, so make one if needed.
     if (!animatedStyle)
         animatedStyle = RenderStyle::clone(targetStyle);

     // FIXME: we need to be more efficient about determining which keyframes we are animating between.
     // We should cache the last pair or something.
     HashSet<int>::const_iterator endProperties = m_keyframes.endProperties();
     for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != endProperties; ++it) {
         int property = *it;

         // Get the from/to styles and progress between
         const RenderStyle* fromStyle = 0;
         const RenderStyle* toStyle = 0;
         double progress = 0.0;
         fetchIntervalEndpointsForProperty(property, fromStyle, toStyle, progress);

         bool needsAnim = blendProperties(this, property, animatedStyle.get(), fromStyle, toStyle, progress);
         if (needsAnim)
             setAnimating();
         else {
 #if USE(ACCELERATED_COMPOSITING)
             // If we are running an accelerated animation, set a flag in the style
             // to indicate it. This can be used to make sure we get an updated
             // style for hit testing, etc.
             animatedStyle->setIsRunningAcceleratedAnimation();
 #endif
         }
     }
 }

 void KeyframeAnimation::getAnimatedStyle(RefPtr<RenderStyle>& animatedStyle)
 {
     // If we're in the delay phase and we're not backwards filling, tell the caller
     // to use the current style.
     if (waitingToStart() && m_animation->delay() > 0 && !m_animation->fillsBackwards())
         return;

     if (!m_keyframes.size())
         return;

     if (!animatedStyle)
         animatedStyle = RenderStyle::clone(m_object->style());

     HashSet<int>::const_iterator endProperties = m_keyframes.endProperties();
     for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != endProperties; ++it) {
         int property = *it;

         // Get the from/to styles and progress between
         const RenderStyle* fromStyle = 0;
         const RenderStyle* toStyle = 0;
         double progress = 0.0;
         fetchIntervalEndpointsForProperty(property, fromStyle, toStyle, progress);

         blendProperties(this, property, animatedStyle.get(), fromStyle, toStyle, progress);
     }
 }

 bool KeyframeAnimation::hasAnimationForProperty(int property) const
 {
     // FIXME: why not just m_keyframes.containsProperty()?
     HashSet<int>::const_iterator end = m_keyframes.endProperties();
     for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != end; ++it) {
         if (*it == property)
             return true;
     }

     return false;
 }

 bool KeyframeAnimation::startAnimation(double timeOffset)
 {
 #if USE(ACCELERATED_COMPOSITING)
     if (m_object && m_object->hasLayer()) {
         RenderLayer* layer = toRenderBoxModelObject(m_object)->layer();
         if (layer->isComposited())
             return layer->backing()->startAnimation(timeOffset, m_animation.get(), m_keyframes);
     }
 #else
     UNUSED_PARAM(timeOffset);
 #endif
     return false;
 }

 void KeyframeAnimation::pauseAnimation(double timeOffset)
 {
     if (!m_object)
         return;

 #if USE(ACCELERATED_COMPOSITING)
     if (m_object->hasLayer()) {
         RenderLayer* layer = toRenderBoxModelObject(m_object)->layer();
         if (layer->isComposited())
             layer->backing()->animationPaused(timeOffset, m_keyframes.animationName());
     }
 #else
     UNUSED_PARAM(timeOffset);
 #endif
     // Restore the original (unanimated) style
     if (!paused())
         setNeedsStyleRecalc(m_object->node());
 }

 void KeyframeAnimation::endAnimation()
 {
     if (!m_object)
         return;

 #if USE(ACCELERATED_COMPOSITING)
     if (m_object->hasLayer()) {
         RenderLayer* layer = toRenderBoxModelObject(m_object)->layer();
         if (layer->isComposited())
             layer->backing()->animationFinished(m_keyframes.animationName());
     }
 #endif
     // Restore the original (unanimated) style
     if (!paused())
         setNeedsStyleRecalc(m_object->node());
 }

 bool KeyframeAnimation::shouldSendEventForListener(Document::ListenerType listenerType) const
 {
     return m_object->document()->hasListenerType(listenerType);
 }

 void KeyframeAnimation::onAnimationStart(double elapsedTime)
 {
     sendAnimationEvent(eventNames().webkitAnimationStartEvent, elapsedTime);
 }

 void KeyframeAnimation::onAnimationIteration(double elapsedTime)
 {
     sendAnimationEvent(eventNames().webkitAnimationIterationEvent, elapsedTime);
 }

 void KeyframeAnimation::onAnimationEnd(double elapsedTime)
 {
     sendAnimationEvent(eventNames().webkitAnimationEndEvent, elapsedTime);
     // End the animation if we don't fill forwards. Forward filling
     // animations are ended properly in the class destructor.
     if (!m_animation->fillsForwards())
         endAnimation();
 }

 bool KeyframeAnimation::sendAnimationEvent(const AtomicString& eventType, double elapsedTime)
 {
     Document::ListenerType listenerType;
     if (eventType == eventNames().webkitAnimationIterationEvent)
         listenerType = Document::ANIMATIONITERATION_LISTENER;
     else if (eventType == eventNames().webkitAnimationEndEvent)
         listenerType = Document::ANIMATIONEND_LISTENER;
     else {
         ASSERT(eventType == eventNames().webkitAnimationStartEvent);
         if (m_startEventDispatched)
             return false;
         m_startEventDispatched = true;
         listenerType = Document::ANIMATIONSTART_LISTENER;
     }

     if (shouldSendEventForListener(listenerType)) {
         // Dispatch the event
         RefPtr<Element> element;
         if (m_object->node() && m_object->node()->isElementNode())
             element = static_cast<Element*>(m_object->node());

         ASSERT(!element || (element->document() && !element->document()->inPageCache()));
         if (!element)
             return false;

         // Schedule event handling
         m_compAnim->animationController()->addEventToDispatch(element, eventType, m_keyframes.animationName(), elapsedTime);

         // Restore the original (unanimated) style
         if (eventType == eventNames().webkitAnimationEndEvent && element->renderer())
             setNeedsStyleRecalc(element.get());

         return true; // Did dispatch an event
     }

     return false; // Did not dispatch an event
 }

 void KeyframeAnimation::overrideAnimations()
 {
     // This will override implicit animations that match the properties in the keyframe animation
     HashSet<int>::const_iterator end = m_keyframes.endProperties();
     for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != end; ++it)
         compositeAnimation()->overrideImplicitAnimations(*it);
 }

 void KeyframeAnimation::resumeOverriddenAnimations()
 {
     // This will resume overridden implicit animations
     HashSet<int>::const_iterator end = m_keyframes.endProperties();
     for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != end; ++it)
         compositeAnimation()->resumeOverriddenImplicitAnimations(*it);
 }

 bool KeyframeAnimation::affectsProperty(int property) const
 {
     HashSet<int>::const_iterator end = m_keyframes.endProperties();
     for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != end; ++it) {
         if (*it == property)
             return true;
     }
     return false;
 }

 void KeyframeAnimation::validateTransformFunctionList()
 {
     m_transformFunctionListValid = false;

     if (m_keyframes.size() < 2 || !m_keyframes.containsProperty(CSSPropertyWebkitTransform))
         return;

     // Empty transforms match anything, so find the first non-empty entry as the reference
     size_t numKeyframes = m_keyframes.size();
     size_t firstNonEmptyTransformKeyframeIndex = numKeyframes;

     for (size_t i = 0; i < numKeyframes; ++i) {
         const KeyframeValue& currentKeyframe = m_keyframes[i];
         if (currentKeyframe.style()->transform().operations().size()) {
             firstNonEmptyTransformKeyframeIndex = i;
             break;
         }
     }

     if (firstNonEmptyTransformKeyframeIndex == numKeyframes)
         return;

     const TransformOperations* firstVal = &m_keyframes[firstNonEmptyTransformKeyframeIndex].style()->transform();

     // See if the keyframes are valid
     for (size_t i = firstNonEmptyTransformKeyframeIndex + 1; i < numKeyframes; ++i) {
         const KeyframeValue& currentKeyframe = m_keyframes[i];
         const TransformOperations* val = &currentKeyframe.style()->transform();

         // A null transform matches anything
         if (val->operations().isEmpty())
             continue;

         // If the sizes of the function lists don't match, the lists don't match
         if (firstVal->operations().size() != val->operations().size())
             return;

         // If the types of each function are not the same, the lists don't match
         for (size_t j = 0; j < firstVal->operations().size(); ++j) {
             if (!firstVal->operations()[j]->isSameType(*val->operations()[j]))
                 return;
         }
     }

     // Keyframes are valid
     m_transformFunctionListValid = true;
 }

 double KeyframeAnimation::timeToNextService()
 {
     double t = AnimationBase::timeToNextService();
 #if USE(ACCELERATED_COMPOSITING)
     if (t != 0 || preActive())
         return t;

     // A return value of 0 means we need service. But if we only have accelerated animations we
     // only need service at the end of the transition
     HashSet<int>::const_iterator endProperties = m_keyframes.endProperties();
     bool acceleratedPropertiesOnly = true;

     for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != endProperties; ++it) {
         if (!animationOfPropertyIsAccelerated(*it) || !isAccelerated()) {
             acceleratedPropertiesOnly = false;
             break;
         }
     }

     if (acceleratedPropertiesOnly) {
         bool isLooping;
         getTimeToNextEvent(t, isLooping);
     }
 #endif
     return t;
 }

 } // namespace WebCore
	/*
	* Copyright (C) 2007 Apple Inc. All rights reserved.
	*
	* Redistribution and use in source and binary forms, with or without
	* modification, are permitted provided that the following conditions
	* are met:
	*
	* 1. Redistributions of source code must retain the above copyright
	* notice, this list of conditions and the following disclaimer.
	* 2. Redistributions in binary form must reproduce the above copyright
	* notice, this list of conditions and the following disclaimer in the
	* documentation and/or other materials provided with the distribution.
	* 3. Neither the name of Apple Computer, Inc. ("Apple") nor the names of
	* its contributors may be used to endorse or promote products derived
	* from this software without specific prior written permission.
	*
	* THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
	* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
	* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
	* DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
	* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
	* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
	* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
	* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
	* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
	* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
	*/

	#include "config.h"
	#include "KeyframeAnimation.h"

	#include "AnimationControllerPrivate.h"
	#include "CSSPropertyNames.h"
	#include "CSSStyleSelector.h"
	#include "CompositeAnimation.h"
	#include "EventNames.h"
	#include "RenderLayer.h"
	#include "RenderLayerBacking.h"
	#include "RenderStyle.h"
	#include <wtf/UnusedParam.h>

	using namespace std;

	namespace WebCore {

	KeyframeAnimation::KeyframeAnimation(const Animation* animation, RenderObject* renderer, int index, CompositeAnimation* compAnim, RenderStyle* unanimatedStyle)
	: AnimationBase(animation, renderer, compAnim)
	, m_keyframes(renderer, animation->name())
	, m_index(index)
	, m_startEventDispatched(false)
	, m_unanimatedStyle(unanimatedStyle)
	{
	// Get the keyframe RenderStyles
	if (m_object && m_object->node() && m_object->node()->isElementNode())
	m_object->document()->styleSelector()->keyframeStylesForAnimation(static_cast<Element*>(m_object->node()), unanimatedStyle, m_keyframes);

	// Update the m_transformFunctionListValid flag based on whether the function lists in the keyframes match.
	validateTransformFunctionList();
	}

	KeyframeAnimation::~KeyframeAnimation()
	{
	// Make sure to tell the renderer that we are ending. This will make sure any accelerated animations are removed.
	if (!postActive())
	endAnimation();
	}

	void KeyframeAnimation::fetchIntervalEndpointsForProperty(int property, const RenderStyle& fromStyle, const RenderStyle& toStyle, double& prog) const
	{
	// Find the first key
	double elapsedTime = getElapsedTime();
	if (m_animation->duration() && m_animation->iterationCount() != Animation::IterationCountInfinite)
	elapsedTime = min(elapsedTime, m_animation->duration() * m_animation->iterationCount());

	double fractionalTime = m_animation->duration() ? (elapsedTime / m_animation->duration()) : 1;

	// FIXME: startTime can be before the current animation "frame" time. This is to sync with the frame time
	// concept in AnimationTimeController. So we need to somehow sync the two. Until then, the possible
	// error is small and will probably not be noticeable. Until we fix this, remove the assert.
	// https://bugs.webkit.org/show_bug.cgi?id=52037
	// ASSERT(fractionalTime >= 0);
	if (fractionalTime < 0)
	fractionalTime = 0;

	// FIXME: share this code with AnimationBase::progress().
	int iteration = static_cast<int>(fractionalTime);
	if (m_animation->iterationCount() != Animation::IterationCountInfinite)
	iteration = min(iteration, m_animation->iterationCount() - 1);
	fractionalTime -= iteration;

	bool reversing = (m_animation->direction() == Animation::AnimationDirectionAlternate) && (iteration & 1);
	if (reversing)
	fractionalTime = 1 - fractionalTime;

	size_t numKeyframes = m_keyframes.size();
	if (!numKeyframes)
	return;

	ASSERT(!m_keyframes[0].key());
	ASSERT(m_keyframes[m_keyframes.size() - 1].key() == 1);

	int prevIndex = -1;
	int nextIndex = -1;

	// FIXME: with a lot of keys, this linear search will be slow. We could binary search.
	for (size_t i = 0; i < numKeyframes; ++i) {
	const KeyframeValue& currKeyFrame = m_keyframes[i];

	if (!currKeyFrame.containsProperty(property))
	continue;

	if (fractionalTime < currKeyFrame.key()) {
	nextIndex = i;
	break;
	}

	prevIndex = i;
	}

	double scale = 1;
	double offset = 0;

	if (prevIndex == -1)
	prevIndex = 0;

	if (nextIndex == -1)
	nextIndex = m_keyframes.size() - 1;

	const KeyframeValue& prevKeyframe = m_keyframes[prevIndex];
	const KeyframeValue& nextKeyframe = m_keyframes[nextIndex];

	fromStyle = prevKeyframe.style();
	toStyle = nextKeyframe.style();

	offset = prevKeyframe.key();
	scale = 1.0 / (nextKeyframe.key() - prevKeyframe.key());

	const TimingFunction* timingFunction = 0;
	if (fromStyle->animations() && fromStyle->animations()->size() > 0) {
	// We get the timing function from the first animation, because we've synthesized a RenderStyle for each keyframe.
	timingFunction = fromStyle->animations()->animation(0)->timingFunction().get();
	}

	prog = progress(scale, offset, timingFunction);
	}

	void KeyframeAnimation::animate(CompositeAnimation, RenderObject, const RenderStyle, RenderStyle targetStyle, RefPtr<RenderStyle>& animatedStyle)
	{
	// Fire the start timeout if needed
	fireAnimationEventsIfNeeded();

	// If we have not yet started, we will not have a valid start time, so just start the animation if needed.
	if (isNew() && m_animation->playState() == AnimPlayStatePlaying)
	updateStateMachine(AnimationStateInputStartAnimation, -1);

	// If we get this far and the animation is done, it means we are cleaning up a just finished animation.
	// If so, we need to send back the targetStyle.
	if (postActive()) {
	if (!animatedStyle)
	animatedStyle = const_cast<RenderStyle*>(targetStyle);
	return;
	}

	// If we are waiting for the start timer, we don't want to change the style yet.
	// Special case 1 - if the delay time is 0, then we do want to set the first frame of the
	// animation right away. This avoids a flash when the animation starts.
	// Special case 2 - if there is a backwards fill mode, then we want to continue
	// through to the style blend so that we get the fromStyle.
	if (waitingToStart() && m_animation->delay() > 0 && !m_animation->fillsBackwards())
	return;

	// If we have no keyframes, don't animate.
	if (!m_keyframes.size()) {
	updateStateMachine(AnimationStateInputEndAnimation, -1);
	return;
	}

	// Run a cycle of animation.
	// We know we will need a new render style, so make one if needed.
	if (!animatedStyle)
	animatedStyle = RenderStyle::clone(targetStyle);

	// FIXME: we need to be more efficient about determining which keyframes we are animating between.
	// We should cache the last pair or something.
	HashSet<int>::const_iterator endProperties = m_keyframes.endProperties();
	for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != endProperties; ++it) {
	int property = *it;

	// Get the from/to styles and progress between
	const RenderStyle* fromStyle = 0;
	const RenderStyle* toStyle = 0;
	double progress = 0.0;
	fetchIntervalEndpointsForProperty(property, fromStyle, toStyle, progress);

	bool needsAnim = blendProperties(this, property, animatedStyle.get(), fromStyle, toStyle, progress);
	if (needsAnim)
	setAnimating();
	else {
	#if USE(ACCELERATED_COMPOSITING)
	// If we are running an accelerated animation, set a flag in the style
	// to indicate it. This can be used to make sure we get an updated
	// style for hit testing, etc.
	animatedStyle->setIsRunningAcceleratedAnimation();
	#endif
	}
	}
	}

	void KeyframeAnimation::getAnimatedStyle(RefPtr<RenderStyle>& animatedStyle)
	{
	// If we're in the delay phase and we're not backwards filling, tell the caller
	// to use the current style.
	if (waitingToStart() && m_animation->delay() > 0 && !m_animation->fillsBackwards())
	return;

	if (!m_keyframes.size())
	return;

	if (!animatedStyle)
	animatedStyle = RenderStyle::clone(m_object->style());

	HashSet<int>::const_iterator endProperties = m_keyframes.endProperties();
	for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != endProperties; ++it) {
	int property = *it;

	// Get the from/to styles and progress between
	const RenderStyle* fromStyle = 0;
	const RenderStyle* toStyle = 0;
	double progress = 0.0;
	fetchIntervalEndpointsForProperty(property, fromStyle, toStyle, progress);

	blendProperties(this, property, animatedStyle.get(), fromStyle, toStyle, progress);
	}
	}

	bool KeyframeAnimation::hasAnimationForProperty(int property) const
	{
	// FIXME: why not just m_keyframes.containsProperty()?
	HashSet<int>::const_iterator end = m_keyframes.endProperties();
	for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != end; ++it) {
	if (*it == property)
	return true;
	}

	return false;
	}

	bool KeyframeAnimation::startAnimation(double timeOffset)
	{
	#if USE(ACCELERATED_COMPOSITING)
	if (m_object && m_object->hasLayer()) {
	RenderLayer* layer = toRenderBoxModelObject(m_object)->layer();
	if (layer->isComposited())
	return layer->backing()->startAnimation(timeOffset, m_animation.get(), m_keyframes);
	}
	#else
	UNUSED_PARAM(timeOffset);
	#endif
	return false;
	}

	void KeyframeAnimation::pauseAnimation(double timeOffset)
	{
	if (!m_object)
	return;

	#if USE(ACCELERATED_COMPOSITING)
	if (m_object->hasLayer()) {
	RenderLayer* layer = toRenderBoxModelObject(m_object)->layer();
	if (layer->isComposited())
	layer->backing()->animationPaused(timeOffset, m_keyframes.animationName());
	}
	#else
	UNUSED_PARAM(timeOffset);
	#endif
	// Restore the original (unanimated) style
	if (!paused())
	setNeedsStyleRecalc(m_object->node());
	}

	void KeyframeAnimation::endAnimation()
	{
	if (!m_object)
	return;

	#if USE(ACCELERATED_COMPOSITING)
	if (m_object->hasLayer()) {
	RenderLayer* layer = toRenderBoxModelObject(m_object)->layer();
	if (layer->isComposited())
	layer->backing()->animationFinished(m_keyframes.animationName());
	}
	#endif
	// Restore the original (unanimated) style
	if (!paused())
	setNeedsStyleRecalc(m_object->node());
	}

	bool KeyframeAnimation::shouldSendEventForListener(Document::ListenerType listenerType) const
	{
	return m_object->document()->hasListenerType(listenerType);
	}

	void KeyframeAnimation::onAnimationStart(double elapsedTime)
	{
	sendAnimationEvent(eventNames().webkitAnimationStartEvent, elapsedTime);
	}

	void KeyframeAnimation::onAnimationIteration(double elapsedTime)
	{
	sendAnimationEvent(eventNames().webkitAnimationIterationEvent, elapsedTime);
	}

	void KeyframeAnimation::onAnimationEnd(double elapsedTime)
	{
	sendAnimationEvent(eventNames().webkitAnimationEndEvent, elapsedTime);
	// End the animation if we don't fill forwards. Forward filling
	// animations are ended properly in the class destructor.
	if (!m_animation->fillsForwards())
	endAnimation();
	}

	bool KeyframeAnimation::sendAnimationEvent(const AtomicString& eventType, double elapsedTime)
	{
	Document::ListenerType listenerType;
	if (eventType == eventNames().webkitAnimationIterationEvent)
	listenerType = Document::ANIMATIONITERATION_LISTENER;
	else if (eventType == eventNames().webkitAnimationEndEvent)
	listenerType = Document::ANIMATIONEND_LISTENER;
	else {
	ASSERT(eventType == eventNames().webkitAnimationStartEvent);
	if (m_startEventDispatched)
	return false;
	m_startEventDispatched = true;
	listenerType = Document::ANIMATIONSTART_LISTENER;
	}

	if (shouldSendEventForListener(listenerType)) {
	// Dispatch the event
	RefPtr<Element> element;
	if (m_object->node() && m_object->node()->isElementNode())
	element = static_cast<Element*>(m_object->node());

	ASSERT(!element \|\| (element->document() && !element->document()->inPageCache()));
	if (!element)
	return false;

	// Schedule event handling
	m_compAnim->animationController()->addEventToDispatch(element, eventType, m_keyframes.animationName(), elapsedTime);

	// Restore the original (unanimated) style
	if (eventType == eventNames().webkitAnimationEndEvent && element->renderer())
	setNeedsStyleRecalc(element.get());

	return true; // Did dispatch an event
	}

	return false; // Did not dispatch an event
	}

	void KeyframeAnimation::overrideAnimations()
	{
	// This will override implicit animations that match the properties in the keyframe animation
	HashSet<int>::const_iterator end = m_keyframes.endProperties();
	for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != end; ++it)
	compositeAnimation()->overrideImplicitAnimations(*it);
	}

	void KeyframeAnimation::resumeOverriddenAnimations()
	{
	// This will resume overridden implicit animations
	HashSet<int>::const_iterator end = m_keyframes.endProperties();
	for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != end; ++it)
	compositeAnimation()->resumeOverriddenImplicitAnimations(*it);
	}

	bool KeyframeAnimation::affectsProperty(int property) const
	{
	HashSet<int>::const_iterator end = m_keyframes.endProperties();
	for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != end; ++it) {
	if (*it == property)
	return true;
	}
	return false;
	}

	void KeyframeAnimation::validateTransformFunctionList()
	{
	m_transformFunctionListValid = false;

	if (m_keyframes.size() < 2 \|\| !m_keyframes.containsProperty(CSSPropertyWebkitTransform))
	return;

	// Empty transforms match anything, so find the first non-empty entry as the reference
	size_t numKeyframes = m_keyframes.size();
	size_t firstNonEmptyTransformKeyframeIndex = numKeyframes;

	for (size_t i = 0; i < numKeyframes; ++i) {
	const KeyframeValue& currentKeyframe = m_keyframes[i];
	if (currentKeyframe.style()->transform().operations().size()) {
	firstNonEmptyTransformKeyframeIndex = i;
	break;
	}
	}

	if (firstNonEmptyTransformKeyframeIndex == numKeyframes)
	return;

	const TransformOperations* firstVal = &m_keyframes[firstNonEmptyTransformKeyframeIndex].style()->transform();

	// See if the keyframes are valid
	for (size_t i = firstNonEmptyTransformKeyframeIndex + 1; i < numKeyframes; ++i) {
	const KeyframeValue& currentKeyframe = m_keyframes[i];
	const TransformOperations* val = &currentKeyframe.style()->transform();

	// A null transform matches anything
	if (val->operations().isEmpty())
	continue;

	// If the sizes of the function lists don't match, the lists don't match
	if (firstVal->operations().size() != val->operations().size())
	return;

	// If the types of each function are not the same, the lists don't match
	for (size_t j = 0; j < firstVal->operations().size(); ++j) {
	if (!firstVal->operations()[j]->isSameType(*val->operations()[j]))
	return;
	}
	}

	// Keyframes are valid
	m_transformFunctionListValid = true;
	}

	double KeyframeAnimation::timeToNextService()
	{
	double t = AnimationBase::timeToNextService();
	#if USE(ACCELERATED_COMPOSITING)
	if (t != 0 \|\| preActive())
	return t;

	// A return value of 0 means we need service. But if we only have accelerated animations we
	// only need service at the end of the transition
	HashSet<int>::const_iterator endProperties = m_keyframes.endProperties();
	bool acceleratedPropertiesOnly = true;

	for (HashSet<int>::const_iterator it = m_keyframes.beginProperties(); it != endProperties; ++it) {
	if (!animationOfPropertyIsAccelerated(*it) \|\| !isAccelerated()) {
	acceleratedPropertiesOnly = false;
	break;
	}
	}

	if (acceleratedPropertiesOnly) {
	bool isLooping;
	getTimeToNextEvent(t, isLooping);
	}
	#endif
	return t;
	}

	} // namespace WebCore