Add foundation for removing AnimatableValues from StyleInterpolation

Source/core/animation/InvalidatableStyleInterpolation.cpp

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "config.h"
+#include "core/animation/InvalidatableStyleInterpolation.h"
+
+#include "core/animation/StringKeyframe.h"
+
+namespace blink {
+
+InvalidatableStyleInterpolation::InvalidatableStyleInterpolation(
+    const Vector<const AnimationType*>& animationTypes,
+    const CSSPropertySpecificKeyframe& startKeyframe,
+    const CSSPropertySpecificKeyframe& endKeyframe)
+    : StyleInterpolation(nullptr, nullptr, animationTypes.first()->property())
+    , m_animationTypes(animationTypes)
+    , m_startKeyframe(startKeyframe)
+    , m_endKeyframe(endKeyframe)
+{
+    maybeCachePairwiseConversion(nullptr);
+    interpolate(0, 0);
+}
+
+bool InvalidatableStyleInterpolation::maybeCachePairwiseConversion(const StyleResolverState* state) const
+{
+    for (const auto& animationType : m_animationTypes) {
+        OwnPtrWillBeRawPtr<PairwisePrimitiveInterpolation> pairwiseConversion = animationType->maybeConvertPairwise(m_startKeyframe, m_endKeyframe, state, m_conversionCheckers);
+        if (pairwiseConversion) {
+            m_cachedValue.type = animationType;
+            pairwiseConversion->initializeAnimationValue(m_cachedValue);
+            m_cachedConversion = pairwiseConversion.release();
+            return true;
+        }
+    }
+    return false;
+}
+
+void InvalidatableStyleInterpolation::interpolate(int, double fraction)
+{
+    m_currentFraction = fraction;
+    if (m_cachedConversion)
+        m_cachedConversion->interpolate(fraction, m_cachedValue);
+    // We defer the interpolation to ensureValidInterpolation() if m_cachedConversion is null.
+}
+
+PassOwnPtrWillBeRawPtr<FlipPrimitiveInterpolation::Side> InvalidatableStyleInterpolation::convertSingleKeyframe(const CSSPropertySpecificKeyframe& keyframe, const StyleResolverState& state) const
+{
+    for (const auto& animationType : m_animationTypes) {
+        OwnPtrWillBeRawPtr<FlipPrimitiveInterpolation::Side> result = animationType->maybeConvertSingle(keyframe, &state, m_conversionCheckers);
+        if (result)
+            return result.release();
+    }
+    ASSERT_NOT_REACHED();
+    return nullptr;
+}
+
+bool InvalidatableStyleInterpolation::isCacheValid(const StyleResolverState& state) const
+{
+    for (const auto& checker : m_conversionCheckers) {
+        if (!checker->isValid(state))
+            return false;
+    }
+    return true;
+}
+
+void InvalidatableStyleInterpolation::ensureValidInterpolation(const StyleResolverState& state) const
+{
+    if (m_cachedConversion && isCacheValid(state))
+        return;
+    m_conversionCheckers.clear();
+    if (!maybeCachePairwiseConversion(&state)) {
+        m_cachedConversion = FlipPrimitiveInterpolation::create(
+            convertSingleKeyframe(m_startKeyframe, state),
+            convertSingleKeyframe(m_endKeyframe, state));
+    }
+    m_cachedConversion->interpolate(m_currentFraction, m_cachedValue);
+}
+
+void InvalidatableStyleInterpolation::apply(StyleResolverState& state) const
+{
+    ensureValidInterpolation(state);
+    m_cachedValue.type->apply(*m_cachedValue.interpolableValue, m_cachedValue.nonInterpolableValue.get(), state);
+}
+
+} // namespace blink