Prepare for responsive CSS animations.

Source/core/animation/css/CSSAnimations.cpp

Index: Source/core/animation/css/CSSAnimations.cpp
diff --git a/Source/core/animation/css/CSSAnimations.cpp b/Source/core/animation/css/CSSAnimations.cpp
index de5204762697c0dc7895916ffa8505a87129f882..93f0c76d84b4eee08b66fb6510e6f89338208133 100644
--- a/Source/core/animation/css/CSSAnimations.cpp
+++ b/Source/core/animation/css/CSSAnimations.cpp
@@ -86,7 +86,7 @@ CSSPropertyID propertyForAnimation(CSSPropertyID property)
 }
 
 static void resolveKeyframes(StyleResolver* resolver, const Element* animatingElement, Element& element, const RenderStyle& style, RenderStyle* parentStyle, const AtomicString& name, TimingFunction* defaultTimingFunction,
-    AnimatableValueKeyframeVector& keyframes)
+    StringKeyframeVector& keyframes)
 {
     // When the animating element is null, use its parent for scoping purposes.
     const Element* elementForScoping = animatingElement ? animatingElement : &element;
@@ -101,7 +101,7 @@ static void resolveKeyframes(StyleResolver* resolver, const Element* animatingEl
     for (size_t i = 0; i < styleKeyframes.size(); ++i) {
         const StyleRuleKeyframe* styleKeyframe = styleKeyframes[i].get();
         RefPtr<RenderStyle> keyframeStyle = resolver->styleForKeyframe(element, style, parentStyle, styleKeyframe, name);
-        RefPtrWillBeRawPtr<AnimatableValueKeyframe> keyframe = AnimatableValueKeyframe::create();
+        RefPtrWillBeRawPtr<StringKeyframe> keyframe = StringKeyframe::create();
         const Vector<double>& offsets = styleKeyframe->keys();
         ASSERT(!offsets.isEmpty());
         keyframe->setOffset(offsets[0]);
@@ -123,13 +123,13 @@ static void resolveKeyframes(StyleResolver* resolver, const Element* animatingEl
                 }
                 keyframe->setEasing(timingFunction.release());
             } else if (CSSPropertyMetadata::isAnimatableProperty(property)) {
-                keyframe->setPropertyValue(property, CSSAnimatableValueFactory::create(property, *keyframeStyle).get());
+                keyframe->setPropertyValue(property, properties.propertyAt(j).value());
             }
         }
         keyframes.append(keyframe);
         // The last keyframe specified at a given offset is used.
         for (size_t j = 1; j < offsets.size(); ++j) {
-            keyframes.append(toAnimatableValueKeyframe(keyframe->cloneWithOffset(offsets[j]).get()));
+            keyframes.append(toStringKeyframe(keyframe->cloneWithOffset(offsets[j]).get()));
         }
     }
 
@@ -154,16 +154,16 @@ static void resolveKeyframes(StyleResolver* resolver, const Element* animatingEl
         keyframes.shrink(targetIndex + 1);
 
     // Add 0% and 100% keyframes if absent.
-    RefPtrWillBeRawPtr<AnimatableValueKeyframe> startKeyframe = keyframes.isEmpty() ? nullptr : keyframes[0];
+    RefPtrWillBeRawPtr<StringKeyframe> startKeyframe = keyframes.isEmpty() ? nullptr : keyframes[0];
     if (!startKeyframe || keyframes[0]->offset() != 0) {
-        startKeyframe = AnimatableValueKeyframe::create();
+        startKeyframe = StringKeyframe::create();
         startKeyframe->setOffset(0);
         startKeyframe->setEasing(defaultTimingFunction);
         keyframes.prepend(startKeyframe);
     }
-    RefPtrWillBeRawPtr<AnimatableValueKeyframe> endKeyframe = keyframes[keyframes.size() - 1];
+    RefPtrWillBeRawPtr<StringKeyframe> endKeyframe = keyframes[keyframes.size() - 1];
     if (endKeyframe->offset() != 1) {
-        endKeyframe = AnimatableValueKeyframe::create();
+        endKeyframe = StringKeyframe::create();
         endKeyframe->setOffset(1);
         endKeyframe->setEasing(defaultTimingFunction);
         keyframes.append(endKeyframe);
@@ -172,7 +172,7 @@ static void resolveKeyframes(StyleResolver* resolver, const Element* animatingEl
     ASSERT(!keyframes.first()->offset());
     ASSERT(keyframes.last()->offset() == 1);
 
-    // Snapshot current property values for 0% and 100% if missing.
+    // FIXME: This is only used for use counting neutral keyframes running on the compositor.
     PropertySet allProperties;
     for (const auto& keyframe : keyframes) {
         for (CSSPropertyID property : keyframe->properties())
@@ -188,19 +188,28 @@ static void resolveKeyframes(StyleResolver* resolver, const Element* animatingEl
             bool endNeedsValue = missingEndValues && !endKeyframeProperties.contains(property);
             if (!startNeedsValue && !endNeedsValue)
                 continue;
-            RefPtrWillBeRawPtr<AnimatableValue> snapshotValue = CSSAnimatableValueFactory::create(property, style);
-            if (startNeedsValue)
-                startKeyframe->setPropertyValue(property, snapshotValue.get());
-            if (endNeedsValue)
-                endKeyframe->setPropertyValue(property, snapshotValue.get());
-            if (property == CSSPropertyOpacity || property == CSSPropertyTransform)
+            if (CompositorAnimations::isCompositableProperty(property))
                 UseCounter::count(elementForScoping->document(), UseCounter::SyntheticKeyframesInCompositedCSSAnimation);
         }
     }
-    ASSERT(startKeyframe->properties().size() == allProperties.size());
-    ASSERT(endKeyframe->properties().size() == allProperties.size());
 }
 
+CSSAnimationUpdate::UpdatedAnimationStyle::CompositableStyleSnapshot snapshotCompositableProperties(RenderObject *renderer, const RenderStyle &newStyle, const AnimationEffect *effect)
+{
+    CSSAnimationUpdate::UpdatedAnimationStyle::CompositableStyleSnapshot snapshot;
+    if (!renderer)
+        return snapshot;
+
+    const RenderStyle& oldStyle = *renderer->style();
+    if (!CSSPropertyEquality::propertiesEqual(CSSPropertyOpacity, oldStyle, newStyle) && effect->affects(CSSPropertyOpacity))
+        snapshot.opacity = CSSAnimatableValueFactory::create(CSSPropertyOpacity, newStyle);
+    if (!CSSPropertyEquality::propertiesEqual(CSSPropertyTransform, oldStyle, newStyle) && effect->affects(CSSPropertyTransform))
+        snapshot.transform = CSSAnimatableValueFactory::create(CSSPropertyTransform, newStyle);
+    if (!CSSPropertyEquality::propertiesEqual(CSSPropertyWebkitFilter, oldStyle, newStyle) && effect->affects(CSSPropertyWebkitFilter))
+        snapshot.webkitFilter = CSSAnimatableValueFactory::create(CSSPropertyWebkitFilter, newStyle);
+
+    return snapshot;
+}
 } // namespace
 
 CSSAnimations::CSSAnimations()
@@ -239,10 +248,12 @@ void CSSAnimations::calculateAnimationUpdate(CSSAnimationUpdate* update, const E
 {
     const ActiveAnimations* activeAnimations = animatingElement ? animatingElement->activeAnimations() : nullptr;
 
+    bool isAnimationStyleChange = activeAnimations && activeAnimations->isAnimationStyleChange();
+
 #if !ENABLE(ASSERT)
     // If we're in an animation style change, no animations can have started, been cancelled or changed play state.
     // When ASSERT is enabled, we verify this optimization.
-    if (activeAnimations && activeAnimations->isAnimationStyleChange())
+    if (isAnimationStyleChange)
         return;
 #endif
 
@@ -281,17 +292,28 @@ void CSSAnimations::calculateAnimationUpdate(CSSAnimationUpdate* update, const E
                     const RunningAnimation* runningAnimation = existing->value.get();
                     AnimationPlayer* player = runningAnimation->player.get();
 
-                    ASSERT(keyframesRule);
                     if (keyframesRule != runningAnimation->styleRule || keyframesRule->version() != runningAnimation->styleRuleVersion || runningAnimation->specifiedTiming != specifiedTiming) {
-                        AnimatableValueKeyframeVector resolvedKeyframes;
+                        ASSERT(!isAnimationStyleChange);
+
+                        StringKeyframeVector resolvedKeyframes;
                         resolveKeyframes(resolver, animatingElement, element, style, parentStyle, animationName, keyframeTimingFunction.get(), resolvedKeyframes);
 
-                        update->updateAnimation(animationName, player, InertAnimation::create(AnimatableValueKeyframeEffectModel::create(resolvedKeyframes),
-                            timing, isPaused, player->currentTimeInternal()), specifiedTiming, keyframesRule);
+                        auto effect = StringKeyframeEffectModel::create(resolvedKeyframes);
+                        effect->setNeutralKeyframeEasings(keyframeTimingFunction);
+                        effect->forceConversionsToAnimatableValues(&element); // FIXME: Remove this once LegacyStyleInterpolation is removed from StringKeyframe
+                        effect->snapshotCompositableProperties(animatingElement, style); // FIXME: Remove this once CompositorAnimations no longer depends on AnimatableValues
+                        update->updateAnimation(animationName, player, InertAnimation::create(effect, timing, isPaused, player->currentTimeInternal()), specifiedTiming, keyframesRule);
+                    } else if (!isAnimationStyleChange && player->source()->isAnimation()) {
+                        AnimationEffect* effect = toAnimation(player->source())->effect();
+                        if (effect && effect->isKeyframeEffectModel()) {
+                            KeyframeEffectModelBase* keyframeEffect = toKeyframeEffectModelBase(effect);
+                            if (keyframeEffect->hasSyntheticKeyframes())
+                                update->updateAnimationStyle(player, keyframeEffect, snapshotCompositableProperties(animatingElement->renderer(), style, effect));
+                        }
                     }
 
                     if (isPaused != player->paused()) {
-                        ASSERT(!activeAnimations || !activeAnimations->isAnimationStyleChange());
+                        ASSERT(!isAnimationStyleChange);
                         update->toggleAnimationPaused(animationName);
                     }
 
@@ -299,18 +321,22 @@ void CSSAnimations::calculateAnimationUpdate(CSSAnimationUpdate* update, const E
                 }
             }
 
-            AnimatableValueKeyframeVector resolvedKeyframes;
+            StringKeyframeVector resolvedKeyframes;
             resolveKeyframes(resolver, animatingElement, element, style, parentStyle, animationName, keyframeTimingFunction.get(), resolvedKeyframes);
             if (!resolvedKeyframes.isEmpty()) {
-                ASSERT(!activeAnimations || !activeAnimations->isAnimationStyleChange());
-                update->startAnimation(animationName, InertAnimation::create(AnimatableValueKeyframeEffectModel::create(resolvedKeyframes), timing, isPaused, 0), specifiedTiming, keyframesRule);
+                ASSERT(!isAnimationStyleChange);
+                auto effect = StringKeyframeEffectModel::create(resolvedKeyframes);
+                effect->setNeutralKeyframeEasings(keyframeTimingFunction);
+                effect->forceConversionsToAnimatableValues(&element); // FIXME: Remove this once LegacyStyleInterpolation is removed from StringKeyframe
+                effect->snapshotCompositableProperties(animatingElement, style); // FIXME: Remove this once CompositorAnimations no longer depends on AnimatableValues
+                update->startAnimation(animationName, InertAnimation::create(effect, timing, isPaused, 0), specifiedTiming, keyframesRule);
             }
         }
     }
 
     ASSERT(inactive.isEmpty() || cssAnimations);
     for (const AtomicString& animationName : inactive) {
-        ASSERT(!activeAnimations || !activeAnimations->isAnimationStyleChange());
+        ASSERT(!isAnimationStyleChange);
         update->cancelAnimation(animationName, *cssAnimations->m_animations.get(animationName)->player);
     }
 }
@@ -356,6 +382,17 @@ void CSSAnimations::maybeApplyPendingUpdate(Element* element)
         m_animations.find(entry.name)->value->update(entry);
     }
 
+    for (const auto& styleUpdate : update->animationsWithStyleUpdates()) {
+        styleUpdate.effect->setDeferredInterpolationsOutdated();
+        if (styleUpdate.snapshot.opacity || styleUpdate.snapshot.transform || styleUpdate.snapshot.webkitFilter) {
+            styleUpdate.effect->updateNeutralKeyframeAnimatableValues(CSSPropertyOpacity, styleUpdate.snapshot.opacity);
+            styleUpdate.effect->updateNeutralKeyframeAnimatableValues(CSSPropertyTransform, styleUpdate.snapshot.transform);
+            styleUpdate.effect->updateNeutralKeyframeAnimatableValues(CSSPropertyWebkitFilter, styleUpdate.snapshot.webkitFilter);
+            styleUpdate.player->setOutdated();
+            styleUpdate.player->setCompositorPending(true);
+        }
+    }
+
     for (const auto& entry : update->newAnimations()) {
         const InertAnimation* inertAnimation = entry.animation.get();
         OwnPtrWillBeRawPtr<AnimationEventDelegate> eventDelegate = adoptPtrWillBeNoop(new AnimationEventDelegate(element, entry.name));