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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 "third_party/blink/renderer/core/animation/css_path_interpolation_type.h"
#include <memory>
#include <utility>
#include "base/memory/ptr_util.h"
#include "third_party/blink/renderer/core/animation/path_interpolation_functions.h"
#include "third_party/blink/renderer/core/css/css_path_value.h"
#include "third_party/blink/renderer/core/css/resolver/style_resolver_state.h"
#include "third_party/blink/renderer/core/style/computed_style.h"
namespace blink {
namespace {
// Returns the property's path() value.
// If the property's value is not a path(), returns nullptr.
StylePath* GetPath(const CSSProperty& property, const ComputedStyle& style) {
switch (property.PropertyID()) {
case CSSPropertyID::kD:
return style.SvgStyle().D();
case CSSPropertyID::kOffsetPath: {
BasicShape* offset_path = style.OffsetPath();
if (!offset_path || offset_path->GetType() != BasicShape::kStylePathType)
return nullptr;
return To<StylePath>(style.OffsetPath());
}
default:
NOTREACHED();
return nullptr;
}
}
// Set the property to the given path() value.
void SetPath(const CSSProperty& property,
ComputedStyle& style,
scoped_refptr<blink::StylePath> path) {
switch (property.PropertyID()) {
case CSSPropertyID::kD:
style.SetD(std::move(path));
return;
case CSSPropertyID::kOffsetPath:
style.SetOffsetPath(std::move(path));
return;
default:
NOTREACHED();
return;
}
}
} // namespace
void CSSPathInterpolationType::ApplyStandardPropertyValue(
const InterpolableValue& interpolable_value,
const NonInterpolableValue* non_interpolable_value,
StyleResolverState& state) const {
std::unique_ptr<SVGPathByteStream> path_byte_stream =
PathInterpolationFunctions::AppliedValue(interpolable_value,
non_interpolable_value);
if (path_byte_stream->IsEmpty()) {
SetPath(CssProperty(), *state.Style(), nullptr);
return;
}
SetPath(CssProperty(), *state.Style(),
StylePath::Create(std::move(path_byte_stream)));
}
void CSSPathInterpolationType::Composite(
UnderlyingValueOwner& underlying_value_owner,
double underlying_fraction,
const InterpolationValue& value,
double interpolation_fraction) const {
PathInterpolationFunctions::Composite(underlying_value_owner,
underlying_fraction, *this, value);
}
InterpolationValue CSSPathInterpolationType::MaybeConvertNeutral(
const InterpolationValue& underlying,
ConversionCheckers& conversion_checkers) const {
return PathInterpolationFunctions::MaybeConvertNeutral(underlying,
conversion_checkers);
}
InterpolationValue CSSPathInterpolationType::MaybeConvertInitial(
const StyleResolverState&,
ConversionCheckers&) const {
return PathInterpolationFunctions::ConvertValue(
nullptr, PathInterpolationFunctions::ForceAbsolute);
}
class InheritedPathChecker : public CSSInterpolationType::CSSConversionChecker {
public:
InheritedPathChecker(const CSSProperty& property,
scoped_refptr<StylePath> style_path)
: property_(property), style_path_(std::move(style_path)) {}
private:
bool IsValid(const StyleResolverState& state,
const InterpolationValue& underlying) const final {
return GetPath(property_, *state.ParentStyle()) == style_path_.get();
}
const CSSProperty& property_;
const scoped_refptr<StylePath> style_path_;
};
InterpolationValue CSSPathInterpolationType::MaybeConvertInherit(
const StyleResolverState& state,
ConversionCheckers& conversion_checkers) const {
if (!state.ParentStyle())
return nullptr;
conversion_checkers.push_back(std::make_unique<InheritedPathChecker>(
CssProperty(), GetPath(CssProperty(), *state.ParentStyle())));
return PathInterpolationFunctions::ConvertValue(
GetPath(CssProperty(), *state.ParentStyle()),
PathInterpolationFunctions::ForceAbsolute);
}
InterpolationValue CSSPathInterpolationType::MaybeConvertValue(
const CSSValue& value,
const StyleResolverState*,
ConversionCheckers& conversion_checkers) const {
auto* path_value = DynamicTo<cssvalue::CSSPathValue>(value);
if (!path_value) {
return nullptr;
}
return PathInterpolationFunctions::ConvertValue(
path_value->ByteStream(), PathInterpolationFunctions::ForceAbsolute);
}
InterpolationValue
CSSPathInterpolationType::MaybeConvertStandardPropertyUnderlyingValue(
const ComputedStyle& style) const {
return PathInterpolationFunctions::ConvertValue(
GetPath(CssProperty(), style), PathInterpolationFunctions::ForceAbsolute);
}
PairwiseInterpolationValue CSSPathInterpolationType::MaybeMergeSingles(
InterpolationValue&& start,
InterpolationValue&& end) const {
return PathInterpolationFunctions::MaybeMergeSingles(std::move(start),
std::move(end));
}
} // namespace blink
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