Web Animations: Add SVGPathInterpolationType

third_party/WebKit/Source/core/animation/SVGPathInterpolationType.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/SVGPathInterpolationType.h"
+
+#include "core/animation/InterpolatedSVGPathSource.h"
+#include "core/animation/InterpolationEnvironment.h"
+#include "core/animation/SVGPathSegInterpolationFunctions.h"
+#include "core/svg/SVGPath.h"
+#include "core/svg/SVGPathByteStreamBuilder.h"
+#include "core/svg/SVGPathByteStreamSource.h"
+#include "core/svg/SVGPathParser.h"
+
+namespace blink {
+
+class SVGPathNonInterpolableValue : public NonInterpolableValue {
+public:
+    virtual ~SVGPathNonInterpolableValue() {}
+
+    static PassRefPtr<SVGPathNonInterpolableValue> create(Vector<SVGPathSegType>& pathSegTypes)
+    {
+        return adoptRef(new SVGPathNonInterpolableValue(pathSegTypes));
+    }
+
+    const Vector<SVGPathSegType>& pathSegTypes() const { return m_pathSegTypes; }
+
+    DECLARE_NON_INTERPOLABLE_VALUE_TYPE();
+
+private:
+    SVGPathNonInterpolableValue(Vector<SVGPathSegType>& pathSegTypes)
+    {
+        m_pathSegTypes.swap(pathSegTypes);
+    }
+
+    Vector<SVGPathSegType> m_pathSegTypes;
+};
+
+DEFINE_NON_INTERPOLABLE_VALUE_TYPE(SVGPathNonInterpolableValue);
+DEFINE_NON_INTERPOLABLE_VALUE_TYPE_CASTS(SVGPathNonInterpolableValue);
+
+enum PathComponentIndex {
+    PathArgsIndex,
+    PathNeutralIndex,
+    PathComponentIndexCount,
+};
+
+PassOwnPtr<InterpolationValue> SVGPathInterpolationType::maybeConvertSVGValue(const SVGPropertyBase& svgValue) const
+{
+    if (svgValue.type() != AnimatedPath)
+        return nullptr;
+
+    SVGPathByteStreamSource pathSource(toSVGPath(svgValue).byteStream());
+    size_t length = 0;
+    PathCoordinates currentCoordinates;
+    Vector<OwnPtr<InterpolableValue>> interpolablePathSegs;
+    Vector<SVGPathSegType> pathSegTypes;
+
+    while (pathSource.hasMoreData()) {
+        const PathSegmentData segment = pathSource.parseSegment();
+        interpolablePathSegs.append(SVGPathSegInterpolationFunctions::consumePathSeg(segment, currentCoordinates));
+        pathSegTypes.append(segment.command);
+        length++;
+    }
+
+    OwnPtr<InterpolableList> pathArgs = InterpolableList::create(length);
+    for (size_t i = 0; i < interpolablePathSegs.size(); i++)
+        pathArgs->set(i, interpolablePathSegs[i].release());
+
+    OwnPtr<InterpolableList> result = InterpolableList::create(PathComponentIndexCount);
+    result->set(PathArgsIndex, pathArgs.release());
+    result->set(PathNeutralIndex, InterpolableNumber::create(0));
+
+    return InterpolationValue::create(*this, result.release(), SVGPathNonInterpolableValue::create(pathSegTypes));
+}
+
+class UnderlyingPathSegTypesChecker : public InterpolationType::ConversionChecker {
+public:
+    ~UnderlyingPathSegTypesChecker() final {}
+
+    static PassOwnPtr<UnderlyingPathSegTypesChecker> create(const InterpolationType& type, const UnderlyingValue& underlyingValue)
+    {
+        return adoptPtr(new UnderlyingPathSegTypesChecker(type, getPathSegTypes(underlyingValue)));
+    }
+
+private:
+    UnderlyingPathSegTypesChecker(const InterpolationType& type, const Vector<SVGPathSegType>& pathSegTypes)
+        : ConversionChecker(type)
+        , m_pathSegTypes(pathSegTypes)
+    { }
+
+    static const Vector<SVGPathSegType>& getPathSegTypes(const UnderlyingValue& underlyingValue)
+    {
+        return toSVGPathNonInterpolableValue(underlyingValue->nonInterpolableValue())->pathSegTypes();
+    }
+
+    bool isValid(const InterpolationEnvironment&, const UnderlyingValue& underlyingValue) const final
+    {
+        return m_pathSegTypes == getPathSegTypes(underlyingValue);
+    }
+
+    Vector<SVGPathSegType> m_pathSegTypes;
+};
+
+PassOwnPtr<InterpolationValue> SVGPathInterpolationType::maybeConvertNeutral(const UnderlyingValue& underlyingValue, ConversionCheckers& conversionCheckers) const
+{
+    conversionCheckers.append(UnderlyingPathSegTypesChecker::create(*this, underlyingValue));
+    OwnPtr<InterpolableList> result = InterpolableList::create(PathComponentIndexCount);
+    result->set(PathArgsIndex, toInterpolableList(underlyingValue->interpolableValue()).get(PathArgsIndex)->cloneAndZero());
+    result->set(PathNeutralIndex, InterpolableNumber::create(1));
+    return InterpolationValue::create(*this, result.release(),
+        const_cast<NonInterpolableValue*>(underlyingValue->nonInterpolableValue())); // Take ref.
+}
+
+static bool pathSegTypesMatch(const Vector<SVGPathSegType>& a, const Vector<SVGPathSegType>& b)
+{
+    if (a.size() != b.size())
+        return false;
+
+    for (size_t i = 0; i < a.size(); i++) {
+        if (toAbsolutePathSegType(a[i]) != toAbsolutePathSegType(b[i]))
+            return false;
+    }
+
+    return true;
+}
+
+PassOwnPtr<PairwisePrimitiveInterpolation> SVGPathInterpolationType::mergeSingleConversions(InterpolationValue& startValue, InterpolationValue& endValue) const
+{
+    const Vector<SVGPathSegType>& startTypes = toSVGPathNonInterpolableValue(startValue.nonInterpolableValue())->pathSegTypes();
+    const Vector<SVGPathSegType>& endTypes = toSVGPathNonInterpolableValue(endValue.nonInterpolableValue())->pathSegTypes();
+    if (!pathSegTypesMatch(startTypes, endTypes))
+        return nullptr;
+
+    return PairwisePrimitiveInterpolation::create(*this,
+        startValue.mutableComponent().interpolableValue.release(),
+        endValue.mutableComponent().interpolableValue.release(),
+        const_cast<NonInterpolableValue*>(endValue.nonInterpolableValue())); // Take ref.
+}
+
+void SVGPathInterpolationType::composite(UnderlyingValue& underlyingValue, double underlyingFraction, const InterpolationValue& value) const
+{
+    const InterpolableList& list = toInterpolableList(value.interpolableValue());
+    double neutralComponent = toInterpolableNumber(list.get(PathNeutralIndex))->value();
+
+    if (neutralComponent == 0) {
+        underlyingValue.set(&value);
+        return;
+    }
+
+    ASSERT(pathSegTypesMatch(
+        toSVGPathNonInterpolableValue(underlyingValue->nonInterpolableValue())->pathSegTypes(),
+        toSVGPathNonInterpolableValue(value.nonInterpolableValue())->pathSegTypes()));
+    underlyingValue.mutableComponent().interpolableValue->scaleAndAdd(neutralComponent, value.interpolableValue());
+    underlyingValue.mutableComponent().nonInterpolableValue = const_cast<NonInterpolableValue*>(value.nonInterpolableValue()); // Take ref.
+}
+
+PassRefPtrWillBeRawPtr<SVGPropertyBase> SVGPathInterpolationType::appliedSVGValue(const InterpolableValue& interpolableValue, const NonInterpolableValue* nonInterpolableValue) const
+{
+    OwnPtr<SVGPathByteStream> pathByteStream = SVGPathByteStream::create();
+    InterpolatedSVGPathSource source(
+        toInterpolableList(*toInterpolableList(interpolableValue).get(PathArgsIndex)),
+        toSVGPathNonInterpolableValue(nonInterpolableValue)->pathSegTypes());
+    SVGPathByteStreamBuilder builder(*pathByteStream);
+    SVGPathParser(&source, &builder).parsePathDataFromSource(UnalteredParsing, false);
+    return SVGPath::create(CSSPathValue::create(pathByteStream.release()));
+}
+
+} // namespace blink