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// Copyright 2016 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/PathInterpolationFunctions.h"
#include "core/animation/InterpolatedSVGPathSource.h"
#include "core/animation/InterpolationEnvironment.h"
#include "core/animation/SVGPathSegInterpolationFunctions.h"
#include "core/css/CSSPathValue.h"
#include "core/svg/SVGPath.h"
#include "core/svg/SVGPathByteStreamBuilder.h"
#include "core/svg/SVGPathByteStreamSource.h"
#include "core/svg/SVGPathParser.h"
#include "wtf/PtrUtil.h"
#include <memory>
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 : unsigned {
PathArgsIndex,
PathNeutralIndex,
PathComponentIndexCount,
};
InterpolationValue PathInterpolationFunctions::convertValue(
const SVGPathByteStream& byteStream) {
SVGPathByteStreamSource pathSource(byteStream);
size_t length = 0;
PathCoordinates currentCoordinates;
Vector<std::unique_ptr<InterpolableValue>> interpolablePathSegs;
Vector<SVGPathSegType> pathSegTypes;
while (pathSource.hasMoreData()) {
const PathSegmentData segment = pathSource.parseSegment();
interpolablePathSegs.push_back(
SVGPathSegInterpolationFunctions::consumePathSeg(segment,
currentCoordinates));
pathSegTypes.push_back(segment.command);
length++;
}
std::unique_ptr<InterpolableList> pathArgs = InterpolableList::create(length);
for (size_t i = 0; i < interpolablePathSegs.size(); i++)
pathArgs->set(i, std::move(interpolablePathSegs[i]));
std::unique_ptr<InterpolableList> result =
InterpolableList::create(PathComponentIndexCount);
result->set(PathArgsIndex, std::move(pathArgs));
result->set(PathNeutralIndex, InterpolableNumber::create(0));
return InterpolationValue(std::move(result),
SVGPathNonInterpolableValue::create(pathSegTypes));
}
InterpolationValue PathInterpolationFunctions::convertValue(
const StylePath* stylePath) {
if (stylePath)
return convertValue(stylePath->byteStream());
std::unique_ptr<SVGPathByteStream> emptyPath = SVGPathByteStream::create();
return convertValue(*emptyPath);
}
class UnderlyingPathSegTypesChecker
: public InterpolationType::ConversionChecker {
public:
~UnderlyingPathSegTypesChecker() final {}
static std::unique_ptr<UnderlyingPathSegTypesChecker> create(
const InterpolationValue& underlying) {
return WTF::wrapUnique(
new UnderlyingPathSegTypesChecker(getPathSegTypes(underlying)));
}
private:
UnderlyingPathSegTypesChecker(const Vector<SVGPathSegType>& pathSegTypes)
: m_pathSegTypes(pathSegTypes) {}
static const Vector<SVGPathSegType>& getPathSegTypes(
const InterpolationValue& underlying) {
return toSVGPathNonInterpolableValue(*underlying.nonInterpolableValue)
.pathSegTypes();
}
bool isValid(const InterpolationEnvironment&,
const InterpolationValue& underlying) const final {
return m_pathSegTypes == getPathSegTypes(underlying);
}
Vector<SVGPathSegType> m_pathSegTypes;
};
InterpolationValue PathInterpolationFunctions::maybeConvertNeutral(
const InterpolationValue& underlying,
InterpolationType::ConversionCheckers& conversionCheckers) {
conversionCheckers.push_back(
UnderlyingPathSegTypesChecker::create(underlying));
std::unique_ptr<InterpolableList> result =
InterpolableList::create(PathComponentIndexCount);
result->set(PathArgsIndex, toInterpolableList(*underlying.interpolableValue)
.get(PathArgsIndex)
->cloneAndZero());
result->set(PathNeutralIndex, InterpolableNumber::create(1));
return InterpolationValue(std::move(result),
underlying.nonInterpolableValue.get());
}
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;
}
PairwiseInterpolationValue PathInterpolationFunctions::maybeMergeSingles(
InterpolationValue&& start,
InterpolationValue&& end) {
const Vector<SVGPathSegType>& startTypes =
toSVGPathNonInterpolableValue(*start.nonInterpolableValue).pathSegTypes();
const Vector<SVGPathSegType>& endTypes =
toSVGPathNonInterpolableValue(*end.nonInterpolableValue).pathSegTypes();
if (!pathSegTypesMatch(startTypes, endTypes))
return nullptr;
return PairwiseInterpolationValue(std::move(start.interpolableValue),
std::move(end.interpolableValue),
std::move(end.nonInterpolableValue));
}
void PathInterpolationFunctions::composite(
UnderlyingValueOwner& underlyingValueOwner,
double underlyingFraction,
const InterpolationType& type,
const InterpolationValue& value) {
const InterpolableList& list = toInterpolableList(*value.interpolableValue);
double neutralComponent =
toInterpolableNumber(list.get(PathNeutralIndex))->value();
if (neutralComponent == 0) {
underlyingValueOwner.set(type, value);
return;
}
DCHECK(pathSegTypesMatch(
toSVGPathNonInterpolableValue(
*underlyingValueOwner.value().nonInterpolableValue)
.pathSegTypes(),
toSVGPathNonInterpolableValue(*value.nonInterpolableValue)
.pathSegTypes()));
underlyingValueOwner.mutableValue().interpolableValue->scaleAndAdd(
neutralComponent, *value.interpolableValue);
underlyingValueOwner.mutableValue().nonInterpolableValue =
value.nonInterpolableValue.get();
}
std::unique_ptr<SVGPathByteStream> PathInterpolationFunctions::appliedValue(
const InterpolableValue& interpolableValue,
const NonInterpolableValue* nonInterpolableValue) {
std::unique_ptr<SVGPathByteStream> pathByteStream =
SVGPathByteStream::create();
InterpolatedSVGPathSource source(
toInterpolableList(
*toInterpolableList(interpolableValue).get(PathArgsIndex)),
toSVGPathNonInterpolableValue(nonInterpolableValue)->pathSegTypes());
SVGPathByteStreamBuilder builder(*pathByteStream);
SVGPathParser::parsePath(source, builder);
return pathByteStream;
}
} // namespace blink
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