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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/UnderlyingValueOwner.h"
#include <memory>
namespace blink {
struct NullValueWrapper {
NullValueWrapper() : value(nullptr) {}
const InterpolationValue value;
};
const InterpolationValue& UnderlyingValueOwner::value() const {
DEFINE_STATIC_LOCAL(NullValueWrapper, nullValueWrapper, ());
return *this ? *m_value : nullValueWrapper.value;
}
void UnderlyingValueOwner::set(std::nullptr_t) {
m_type = nullptr;
m_valueOwner.clear();
m_value = nullptr;
}
void UnderlyingValueOwner::set(const InterpolationType& type,
const InterpolationValue& value) {
DCHECK(value);
m_type = &type;
// By clearing m_valueOwner we will perform a copy before attempting to mutate
// m_value, thus upholding the const contract for this instance of
// interpolationValue.
m_valueOwner.clear();
m_value = &value;
}
void UnderlyingValueOwner::set(const InterpolationType& type,
InterpolationValue&& value) {
DCHECK(value);
m_type = &type;
m_valueOwner = std::move(value);
m_value = &m_valueOwner;
}
void UnderlyingValueOwner::set(std::unique_ptr<TypedInterpolationValue> value) {
if (value)
set(value->type(), std::move(value->mutableValue()));
else
set(nullptr);
}
void UnderlyingValueOwner::set(const TypedInterpolationValue* value) {
if (value)
set(value->type(), value->value());
else
set(nullptr);
}
InterpolationValue& UnderlyingValueOwner::mutableValue() {
DCHECK(m_type && m_value);
if (!m_valueOwner) {
m_valueOwner = m_value->clone();
m_value = &m_valueOwner;
}
return m_valueOwner;
}
} // namespace blink
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