WIP: Implement CSS transitions on top of InterpolationTypes instead of AnimatableValues

third_party/WebKit/Source/core/animation/DeferredLegacyStyleInterpolation.cpp

Index: third_party/WebKit/Source/core/animation/DeferredLegacyStyleInterpolation.cpp
diff --git a/third_party/WebKit/Source/core/animation/DeferredLegacyStyleInterpolation.cpp b/third_party/WebKit/Source/core/animation/DeferredLegacyStyleInterpolation.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..b5ee2deb13af27685088d3ce627bd2343293afc9
--- /dev/null
+++ b/third_party/WebKit/Source/core/animation/DeferredLegacyStyleInterpolation.cpp
@@ -0,0 +1,177 @@
+// Copyright 2014 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 "core/animation/DeferredLegacyStyleInterpolation.h"
+
+#include "core/animation/ElementAnimations.h"
+#include "core/animation/css/CSSAnimatableValueFactory.h"
+#include "core/css/CSSBasicShapeValues.h"
+#include "core/css/CSSImageValue.h"
+#include "core/css/CSSPrimitiveValue.h"
+#include "core/css/CSSQuadValue.h"
+#include "core/css/CSSSVGDocumentValue.h"
+#include "core/css/CSSShadowValue.h"
+#include "core/css/CSSValueList.h"
+#include "core/css/CSSValuePair.h"
+#include "core/css/resolver/StyleResolver.h"
+#include "core/css/resolver/StyleResolverState.h"
+
+namespace blink {
+
+void DeferredLegacyStyleInterpolation::apply(StyleResolverState& state) const
+{
+    if (m_outdated || !state.element()->elementAnimations() || !state.element()->elementAnimations()->isAnimationStyleChange()) {
+        RefPtr<AnimatableValue> startAnimatableValue;
+        RefPtr<AnimatableValue> endAnimatableValue;
+
+        // Snapshot underlying values for neutral keyframes first because non-neutral keyframes will mutate the StyleResolverState.
+        if (!m_endCSSValue) {
+            endAnimatableValue = StyleResolver::createAnimatableValueSnapshot(state, m_id, m_endCSSValue.get());
+            startAnimatableValue = StyleResolver::createAnimatableValueSnapshot(state, m_id, m_startCSSValue.get());
+        } else {
+            startAnimatableValue = StyleResolver::createAnimatableValueSnapshot(state, m_id, m_startCSSValue.get());
+            endAnimatableValue = StyleResolver::createAnimatableValueSnapshot(state, m_id, m_endCSSValue.get());
+        }
+
+        m_innerInterpolation = LegacyStyleInterpolation::create(startAnimatableValue, endAnimatableValue, m_id);
+        m_outdated = false;
+    }
+
+    m_innerInterpolation->interpolate(m_currentIteration, m_currentFraction);
+    m_innerInterpolation->apply(state);
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSValue& value)
+{
+    // FIXME: should not require resolving styles for inherit/initial/unset.
+    if (value.isCSSWideKeyword())
+        return true;
+    if (value.isBasicShapeCircleValue())
+        return interpolationRequiresStyleResolve(toCSSBasicShapeCircleValue(value));
+    if (value.isBasicShapeEllipseValue())
+        return interpolationRequiresStyleResolve(toCSSBasicShapeEllipseValue(value));
+    if (value.isBasicShapePolygonValue())
+        return interpolationRequiresStyleResolve(toCSSBasicShapePolygonValue(value));
+    if (value.isBasicShapeInsetValue())
+        return interpolationRequiresStyleResolve(toCSSBasicShapeInsetValue(value));
+    if (value.isColorValue())
+        return false;
+    if (value.isStringValue() || value.isURIValue() || value.isCustomIdentValue())
+        return false;
+    if (value.isPrimitiveValue())
+        return interpolationRequiresStyleResolve(toCSSPrimitiveValue(value));
+    if (value.isQuadValue())
+        return interpolationRequiresStyleResolve(toCSSQuadValue(value));
+    if (value.isValueList())
+        return interpolationRequiresStyleResolve(toCSSValueList(value));
+    if (value.isValuePair())
+        return interpolationRequiresStyleResolve(toCSSValuePair(value));
+    if (value.isImageValue())
+        return interpolationRequiresStyleResolve(toCSSImageValue(value));
+    if (value.isShadowValue())
+        return interpolationRequiresStyleResolve(toCSSShadowValue(value));
+    if (value.isSVGDocumentValue())
+        return interpolationRequiresStyleResolve(toCSSSVGDocumentValue(value));
+    // FIXME: consider other custom types.
+    return true;
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSPrimitiveValue& primitiveValue)
+{
+    // FIXME: consider other types.
+    if (primitiveValue.isNumber() || primitiveValue.isPercentage() || primitiveValue.isAngle())
+        return false;
+
+    if (primitiveValue.isLength())
+        return primitiveValue.isFontRelativeLength() || primitiveValue.isViewportPercentageLength();
+
+    if (primitiveValue.isCalculated()) {
+        CSSLengthArray lengthArray;
+        primitiveValue.accumulateLengthArray(lengthArray);
+        return lengthArray.values[CSSPrimitiveValue::UnitTypeFontSize] != 0
+            || lengthArray.values[CSSPrimitiveValue::UnitTypeFontXSize] != 0
+            || lengthArray.values[CSSPrimitiveValue::UnitTypeRootFontSize] != 0
+            || lengthArray.values[CSSPrimitiveValue::UnitTypeZeroCharacterWidth] != 0
+            || lengthArray.values[CSSPrimitiveValue::UnitTypeViewportWidth] != 0
+            || lengthArray.values[CSSPrimitiveValue::UnitTypeViewportHeight] != 0
+            || lengthArray.values[CSSPrimitiveValue::UnitTypeViewportMin] != 0
+            || lengthArray.values[CSSPrimitiveValue::UnitTypeViewportMax] != 0;
+    }
+
+    CSSValueID id = primitiveValue.getValueID();
+    bool isColor = ((id >= CSSValueAqua && id <= CSSValueTransparent)
+        || (id >= CSSValueAliceblue && id <= CSSValueYellowgreen)
+        || id == CSSValueGrey);
+    return (id != CSSValueNone) && !isColor;
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSImageValue& imageValue)
+{
+    return false;
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSShadowValue& shadowValue)
+{
+    return (shadowValue.x && interpolationRequiresStyleResolve(*shadowValue.x))
+        || (shadowValue.y && interpolationRequiresStyleResolve(*shadowValue.y))
+        || (shadowValue.blur && interpolationRequiresStyleResolve(*shadowValue.blur))
+        || (shadowValue.spread && interpolationRequiresStyleResolve(*shadowValue.spread))
+        || (shadowValue.style && interpolationRequiresStyleResolve(*shadowValue.style))
+        || (shadowValue.color && interpolationRequiresStyleResolve(*shadowValue.color));
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSSVGDocumentValue& documentValue)
+{
+    return true;
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSValueList& valueList)
+{
+    size_t length = valueList.length();
+    for (size_t index = 0; index < length; ++index) {
+        if (interpolationRequiresStyleResolve(*valueList.item(index)))
+            return true;
+    }
+    return false;
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSValuePair& pair)
+{
+    return interpolationRequiresStyleResolve(pair.first())
+        || interpolationRequiresStyleResolve(pair.second());
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSBasicShapeCircleValue& shape)
+{
+    // FIXME: Should inspect the members.
+    return false;
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSBasicShapeEllipseValue& shape)
+{
+    // FIXME: Should inspect the members.
+    return false;
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSBasicShapePolygonValue& shape)
+{
+    // FIXME: Should inspect the members.
+    return false;
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSBasicShapeInsetValue& shape)
+{
+    // FIXME: Should inspect the members.
+    return false;
+}
+
+bool DeferredLegacyStyleInterpolation::interpolationRequiresStyleResolve(const CSSQuadValue& quad)
+{
+    return interpolationRequiresStyleResolve(*quad.top())
+        || interpolationRequiresStyleResolve(*quad.right())
+        || interpolationRequiresStyleResolve(*quad.bottom())
+        || interpolationRequiresStyleResolve(*quad.left());
+}
+
+} // namespace blink