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// 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.
#ifndef InterpolableValue_h
#define InterpolableValue_h
#include "core/CoreExport.h"
#include "core/animation/animatable/AnimatableValue.h"
#include "platform/heap/Handle.h"
#include "wtf/PtrUtil.h"
#include "wtf/Vector.h"
#include <memory>
namespace blink {
// Represents the components of a PropertySpecificKeyframe's value that change
// smoothly as it interpolates to an adjacent value.
class CORE_EXPORT InterpolableValue {
USING_FAST_MALLOC(InterpolableValue);
public:
virtual ~InterpolableValue() {}
virtual bool isNumber() const { return false; }
virtual bool isBool() const { return false; }
virtual bool isList() const { return false; }
virtual bool isAnimatableValue() const { return false; }
virtual bool equals(const InterpolableValue&) const = 0;
virtual std::unique_ptr<InterpolableValue> clone() const = 0;
virtual std::unique_ptr<InterpolableValue> cloneAndZero() const = 0;
virtual void scale(double scale) = 0;
virtual void scaleAndAdd(double scale, const InterpolableValue& other) = 0;
private:
virtual void interpolate(const InterpolableValue& to,
const double progress,
InterpolableValue& result) const = 0;
friend class LegacyStyleInterpolation;
friend class PairwisePrimitiveInterpolation;
// Keep interpolate private, but allow calls within the hierarchy without
// knowledge of type.
friend class InterpolableNumber;
friend class InterpolableBool;
friend class InterpolableList;
friend class AnimationInterpolableValueTest;
};
class CORE_EXPORT InterpolableNumber final : public InterpolableValue {
public:
static std::unique_ptr<InterpolableNumber> create(double value) {
return WTF::wrapUnique(new InterpolableNumber(value));
}
bool isNumber() const final { return true; }
double value() const { return m_value; }
bool equals(const InterpolableValue& other) const final;
std::unique_ptr<InterpolableValue> clone() const final {
return create(m_value);
}
std::unique_ptr<InterpolableValue> cloneAndZero() const final {
return create(0);
}
void scale(double scale) final;
void scaleAndAdd(double scale, const InterpolableValue& other) final;
void set(double value) { m_value = value; }
private:
void interpolate(const InterpolableValue& to,
const double progress,
InterpolableValue& result) const final;
double m_value;
explicit InterpolableNumber(double value) : m_value(value) {}
};
class CORE_EXPORT InterpolableList : public InterpolableValue {
public:
// Explicitly delete operator= because MSVC automatically generate
// copy constructors and operator= for dll-exported classes.
// Since InterpolableList is not copyable, automatically generated
// operator= causes MSVC compiler error.
// However, we cannot use WTF_MAKE_NONCOPYABLE because InterpolableList
// has its own copy constructor. So just delete operator= here.
InterpolableList& operator=(const InterpolableList&) = delete;
static std::unique_ptr<InterpolableList> create(
const InterpolableList& other) {
return WTF::wrapUnique(new InterpolableList(other));
}
static std::unique_ptr<InterpolableList> create(size_t size) {
return WTF::wrapUnique(new InterpolableList(size));
}
bool isList() const final { return true; }
void set(size_t position, std::unique_ptr<InterpolableValue> value) {
m_values[position] = std::move(value);
}
const InterpolableValue* get(size_t position) const {
return m_values[position].get();
}
std::unique_ptr<InterpolableValue>& getMutable(size_t position) {
return m_values[position];
}
size_t length() const { return m_values.size(); }
bool equals(const InterpolableValue& other) const final;
std::unique_ptr<InterpolableValue> clone() const final {
return create(*this);
}
std::unique_ptr<InterpolableValue> cloneAndZero() const final;
void scale(double scale) final;
void scaleAndAdd(double scale, const InterpolableValue& other) final;
private:
void interpolate(const InterpolableValue& to,
const double progress,
InterpolableValue& result) const final;
explicit InterpolableList(size_t size) : m_values(size) {}
InterpolableList(const InterpolableList& other) : m_values(other.length()) {
for (size_t i = 0; i < length(); i++)
set(i, other.m_values[i]->clone());
}
Vector<std::unique_ptr<InterpolableValue>> m_values;
};
// FIXME: Remove this when we can.
class InterpolableAnimatableValue : public InterpolableValue {
public:
static std::unique_ptr<InterpolableAnimatableValue> create(
PassRefPtr<AnimatableValue> value) {
return WTF::wrapUnique(new InterpolableAnimatableValue(std::move(value)));
}
bool isAnimatableValue() const final { return true; }
AnimatableValue* value() const { return m_value.get(); }
bool equals(const InterpolableValue&) const final {
NOTREACHED();
return false;
}
std::unique_ptr<InterpolableValue> clone() const final {
return create(m_value);
}
std::unique_ptr<InterpolableValue> cloneAndZero() const final {
NOTREACHED();
return nullptr;
}
void scale(double scale) final { NOTREACHED(); }
void scaleAndAdd(double scale, const InterpolableValue& other) final {
NOTREACHED();
}
private:
void interpolate(const InterpolableValue& to,
const double progress,
InterpolableValue& result) const final;
RefPtr<AnimatableValue> m_value;
InterpolableAnimatableValue(PassRefPtr<AnimatableValue> value)
: m_value(value) {}
};
DEFINE_TYPE_CASTS(InterpolableNumber,
InterpolableValue,
value,
value->isNumber(),
value.isNumber());
DEFINE_TYPE_CASTS(InterpolableList,
InterpolableValue,
value,
value->isList(),
value.isList());
DEFINE_TYPE_CASTS(InterpolableAnimatableValue,
InterpolableValue,
value,
value->isAnimatableValue(),
value.isAnimatableValue());
} // namespace blink
#endif
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