compositeanimation.cpp

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/*
 * 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
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#include "config.h"
#include "CompositeAnimation.h"

#include "AnimationControllerPrivate.h"
#include "CSSPropertyNames.h"
#include "ImplicitAnimation.h"
#include "KeyframeAnimation.h"
#include "RenderObject.h"
#include "RenderStyle.h"

namespace WebCore {

class CompositeAnimationPrivate {
public:
    CompositeAnimationPrivate(AnimationControllerPrivate* animationController, CompositeAnimation* compositeAnimation)
        : m_isSuspended(false)
        , m_animationController(animationController)
        , m_compositeAnimation(compositeAnimation)
        , m_numStyleAvailableWaiters(0)
    {
    }
    
    ~CompositeAnimationPrivate();

    void clearRenderer();

    PassRefPtr<RenderStyle> animate(RenderObject*, RenderStyle* currentStyle, RenderStyle* targetStyle);
    PassRefPtr<RenderStyle> getAnimatedStyle();

    AnimationControllerPrivate* animationControllerPriv() const { return m_animationController; }

    void setAnimating(bool);
    double willNeedService() const;
    
    PassRefPtr<KeyframeAnimation> getAnimationForProperty(int property);

    void cleanupFinishedAnimations(RenderObject*);

    void suspendAnimations();
    void resumeAnimations();
    bool isSuspended() const { return m_isSuspended; }

    void overrideImplicitAnimations(int property);
    void resumeOverriddenImplicitAnimations(int property);

    bool hasAnimations() const  { return !m_transitions.isEmpty() || !m_keyframeAnimations.isEmpty(); }

    bool isAnimatingProperty(int property, bool isRunningNow) const;

    void addToStyleAvailableWaitList(AnimationBase*);
    void removeFromStyleAvailableWaitList(AnimationBase*);

    void addToStartTimeResponseWaitList(AnimationBase*, bool willGetResponse);
    void removeFromStartTimeResponseWaitList(AnimationBase*);

    bool pauseAnimationAtTime(const AtomicString& name, double t);
    bool pauseTransitionAtTime(int property, double t);
    unsigned numberOfActiveAnimations() const;

protected:
    void updateTransitions(RenderObject*, RenderStyle* currentStyle, RenderStyle* targetStyle);
    void updateKeyframeAnimations(RenderObject*, RenderStyle* currentStyle, RenderStyle* targetStyle);

private:
    typedef HashMap<int, RefPtr<ImplicitAnimation> > CSSPropertyTransitionsMap;
    typedef HashMap<AtomicStringImpl*, RefPtr<KeyframeAnimation> >  AnimationNameMap;

    CSSPropertyTransitionsMap m_transitions;
    AnimationNameMap m_keyframeAnimations;
    Vector<AtomicStringImpl*> m_keyframeAnimationOrderMap;
    bool m_isSuspended;
    AnimationControllerPrivate* m_animationController;
    CompositeAnimation* m_compositeAnimation;
    unsigned m_numStyleAvailableWaiters;
};

CompositeAnimationPrivate::~CompositeAnimationPrivate()
{
    // Toss the refs to all animations
    m_transitions.clear();
    m_keyframeAnimations.clear();
}

void CompositeAnimationPrivate::clearRenderer()
{
    if (!m_transitions.isEmpty()) {
        // Clear the renderers from all running animations, in case we are in the middle of
        // an animation callback (see https://bugs.webkit.org/show_bug.cgi?id=22052)
        CSSPropertyTransitionsMap::const_iterator transitionsEnd = m_transitions.end();
        for (CSSPropertyTransitionsMap::const_iterator it = m_transitions.begin(); it != transitionsEnd; ++it) {
            ImplicitAnimation* transition = it->second.get();
            transition->clearRenderer();
        }
    }
    if (!m_keyframeAnimations.isEmpty()) {
        AnimationNameMap::const_iterator animationsEnd = m_keyframeAnimations.end();
        for (AnimationNameMap::const_iterator it = m_keyframeAnimations.begin(); it != animationsEnd; ++it) {
            KeyframeAnimation* anim = it->second.get();
            anim->clearRenderer();
        }
    }
}

void CompositeAnimationPrivate::updateTransitions(RenderObject* renderer, RenderStyle* currentStyle, RenderStyle* targetStyle)
{
    RefPtr<RenderStyle> modifiedCurrentStyle;
    
    // If currentStyle is null, we don't do transitions
    if (!currentStyle || !targetStyle->transitions())
        return;

    // Check to see if we need to update the active transitions
    for (size_t i = 0; i < targetStyle->transitions()->size(); ++i) {
        const Animation* anim = targetStyle->transitions()->animation(i);
        bool isActiveTransition = anim->duration() || anim->delay() > 0;

        int prop = anim->property();

        if (prop == cAnimateNone)
            continue;

        bool all = prop == cAnimateAll;

        // Handle both the 'all' and single property cases. For the single prop case, we make only one pass
        // through the loop.
        for (int propertyIndex = 0; propertyIndex < AnimationBase::getNumProperties(); ++propertyIndex) {
            if (all) {
                // Get the next property which is not a shorthand.
                bool isShorthand;
                prop = AnimationBase::getPropertyAtIndex(propertyIndex, isShorthand);
                if (isShorthand)
                    continue;
            }

            // ImplicitAnimations are always hashed by actual properties, never cAnimateAll
            ASSERT(prop >= firstCSSProperty && prop < (firstCSSProperty + numCSSProperties));

            // If there is a running animation for this property, the transition is overridden
            // and we have to use the unanimatedStyle from the animation. We do the test
            // against the unanimated style here, but we "override" the transition later.
            RefPtr<KeyframeAnimation> keyframeAnim = getAnimationForProperty(prop);
            RenderStyle* fromStyle = keyframeAnim ? keyframeAnim->unanimatedStyle() : currentStyle;

            // See if there is a current transition for this prop
            ImplicitAnimation* implAnim = m_transitions.get(prop).get();
            bool equal = true;

            if (implAnim) {
                // This implAnim might not be an already running transition. It might be
                // newly added to the list in a previous iteration. This would happen if
                // you have both an explicit transition-property and 'all' in the same
                // list. In this case, the latter one overrides the earlier one, so we
                // behave as though this is a running animation being replaced.
                if (!implAnim->isTargetPropertyEqual(prop, targetStyle)) {
#if USE(ACCELERATED_COMPOSITING)
                    // For accelerated animations we need to return a new RenderStyle with the _current_ value
                    // of the property, so that restarted transitions use the correct starting point.
                    if (AnimationBase::animationOfPropertyIsAccelerated(prop) && !implAnim->isFallbackAnimating()) {
                        if (!modifiedCurrentStyle)
                            modifiedCurrentStyle = RenderStyle::clone(currentStyle);

                        implAnim->blendPropertyValueInStyle(prop, modifiedCurrentStyle.get());
                    }
#endif
                    m_transitions.remove(prop);
                    equal = false;
                }
            } else {
                // We need to start a transition if it is active and the properties don't match
                equal = !isActiveTransition || AnimationBase::propertiesEqual(prop, fromStyle, targetStyle);
            }

            if (!equal) {
                // Add the new transition
                m_transitions.set(prop, ImplicitAnimation::create(const_cast<Animation*>(anim), prop, renderer, m_compositeAnimation, modifiedCurrentStyle ? modifiedCurrentStyle.get() : fromStyle));
            }
            
            // We only need one pass for the single prop case
            if (!all)
                break;
        }
    }
}

void CompositeAnimationPrivate::updateKeyframeAnimations(RenderObject* renderer, RenderStyle* currentStyle, RenderStyle* targetStyle)
{
    // Nothing to do if we don't have any animations, and didn't have any before
    if (m_keyframeAnimations.isEmpty() && !targetStyle->hasAnimations())
        return;

    // Nothing to do if the current and target animations are the same
    if (currentStyle && currentStyle->hasAnimations() && targetStyle->hasAnimations() && *(currentStyle->animations()) == *(targetStyle->animations()))
        return;
        
    // Mark all existing animations as no longer active
    AnimationNameMap::const_iterator kfend = m_keyframeAnimations.end();
    for (AnimationNameMap::const_iterator it = m_keyframeAnimations.begin(); it != kfend; ++it)
        it->second->setIndex(-1);
        
    // Toss the animation order map
    m_keyframeAnimationOrderMap.clear();
    
    // Now mark any still active animations as active and add any new animations
    if (targetStyle->animations()) {
        int numAnims = targetStyle->animations()->size();
        for (int i = 0; i < numAnims; ++i) {
            const Animation* anim = targetStyle->animations()->animation(i);
            AtomicString animationName(anim->name());

            if (!anim->isValidAnimation())
                continue;
            
            // See if there is a current animation for this name
            RefPtr<KeyframeAnimation> keyframeAnim = m_keyframeAnimations.get(animationName.impl());
                
            if (keyframeAnim) {
                // There is one so it is still active

                // Animations match, but play states may differ. update if needed
                keyframeAnim->updatePlayState(anim->playState() == AnimPlayStatePlaying);
                            
                // Set the saved animation to this new one, just in case the play state has changed
                keyframeAnim->setAnimation(anim);
                keyframeAnim->setIndex(i);
            } else if ((anim->duration() || anim->delay()) && anim->iterationCount()) {
                keyframeAnim = KeyframeAnimation::create(const_cast<Animation*>(anim), renderer, i, m_compositeAnimation, currentStyle ? currentStyle : targetStyle);
                m_keyframeAnimations.set(keyframeAnim->name().impl(), keyframeAnim);
            }
            
            // Add this to the animation order map
            if (keyframeAnim)
                m_keyframeAnimationOrderMap.append(keyframeAnim->name().impl());
        }
    }

    // Make a list of animations to be removed
    Vector<AtomicStringImpl*> animsToBeRemoved;
    kfend = m_keyframeAnimations.end();
    for (AnimationNameMap::const_iterator it = m_keyframeAnimations.begin(); it != kfend; ++it) {
        KeyframeAnimation* keyframeAnim = it->second.get();
        if (keyframeAnim->index() < 0)
            animsToBeRemoved.append(keyframeAnim->name().impl());
    }
    
    // Now remove the animations from the list
    for (size_t j = 0; j < animsToBeRemoved.size(); ++j)
        m_keyframeAnimations.remove(animsToBeRemoved[j]);
}

PassRefPtr<RenderStyle> CompositeAnimationPrivate::animate(RenderObject* renderer, RenderStyle* currentStyle, RenderStyle* targetStyle)
{
    RefPtr<RenderStyle> resultStyle;

    // Update animations first so we can see if any transitions are overridden
    updateKeyframeAnimations(renderer, currentStyle, targetStyle);

    // We don't do any transitions if we don't have a currentStyle (on startup)
    updateTransitions(renderer, currentStyle, targetStyle);

    if (currentStyle) {
        // Now that we have transition objects ready, let them know about the new goal state.  We want them
        // to fill in a RenderStyle*& only if needed.
        if (!m_transitions.isEmpty()) {
            CSSPropertyTransitionsMap::const_iterator end = m_transitions.end();
            for (CSSPropertyTransitionsMap::const_iterator it = m_transitions.begin(); it != end; ++it) {
                if (ImplicitAnimation* anim = it->second.get())
                    anim->animate(m_compositeAnimation, renderer, currentStyle, targetStyle, resultStyle);
            }
        }
    }

    // Now that we have animation objects ready, let them know about the new goal state.  We want them
    // to fill in a RenderStyle*& only if needed.
    for (Vector<AtomicStringImpl*>::const_iterator it = m_keyframeAnimationOrderMap.begin(); it != m_keyframeAnimationOrderMap.end(); ++it) {
        RefPtr<KeyframeAnimation> keyframeAnim = m_keyframeAnimations.get(*it);
        if (keyframeAnim)
            keyframeAnim->animate(m_compositeAnimation, renderer, currentStyle, targetStyle, resultStyle);
    }

    cleanupFinishedAnimations(renderer);

    return resultStyle ? resultStyle.release() : targetStyle;
}

PassRefPtr<RenderStyle> CompositeAnimationPrivate::getAnimatedStyle()
{
    RefPtr<RenderStyle> resultStyle;
    CSSPropertyTransitionsMap::const_iterator end = m_transitions.end();
    for (CSSPropertyTransitionsMap::const_iterator it = m_transitions.begin(); it != end; ++it) {
        if (ImplicitAnimation* implicitAnimation = it->second.get())
            implicitAnimation->getAnimatedStyle(resultStyle);
    }

    for (Vector<AtomicStringImpl*>::const_iterator it = m_keyframeAnimationOrderMap.begin(); it != m_keyframeAnimationOrderMap.end(); ++it) {
        RefPtr<KeyframeAnimation> keyframeAnimation = m_keyframeAnimations.get(*it);
        if (keyframeAnimation)
            keyframeAnimation->getAnimatedStyle(resultStyle);
    }
    
    return resultStyle;
}

// "animating" means that something is running that requires the timer to keep firing
void CompositeAnimationPrivate::setAnimating(bool animating)
{
    if (!m_transitions.isEmpty()) {
        CSSPropertyTransitionsMap::const_iterator transitionsEnd = m_transitions.end();
        for (CSSPropertyTransitionsMap::const_iterator it = m_transitions.begin(); it != transitionsEnd; ++it) {
            ImplicitAnimation* transition = it->second.get();
            transition->setAnimating(animating);
        }
    }
    if (!m_keyframeAnimations.isEmpty()) {
        AnimationNameMap::const_iterator animationsEnd = m_keyframeAnimations.end();
        for (AnimationNameMap::const_iterator it = m_keyframeAnimations.begin(); it != animationsEnd; ++it) {
            KeyframeAnimation* anim = it->second.get();
            anim->setAnimating(animating);
        }
    }
}

double CompositeAnimationPrivate::willNeedService() const
{
    // Returns the time at which next service is required. -1 means no service is required. 0 means 
    // service is required now, and > 0 means service is required that many seconds in the future.
    double minT = -1;
    
    if (!m_transitions.isEmpty()) {
        CSSPropertyTransitionsMap::const_iterator transitionsEnd = m_transitions.end();
        for (CSSPropertyTransitionsMap::const_iterator it = m_transitions.begin(); it != transitionsEnd; ++it) {
            ImplicitAnimation* transition = it->second.get();
            double t = transition ? transition->willNeedService() : -1;
            if (t < minT || minT == -1)
                minT = t;
            if (minT == 0)
                return 0;
        }
    }
    if (!m_keyframeAnimations.isEmpty()) {
        AnimationNameMap::const_iterator animationsEnd = m_keyframeAnimations.end();