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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 THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_INTERPOLABLE_VALUE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_INTERPOLABLE_VALUE_H_
#include <memory>
#include <utility>
#include "base/memory/ptr_util.h"
#include "third_party/blink/renderer/core/animation/animatable/animatable_value.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/wtf/vector.h"
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() = default;
virtual bool IsNumber() const { return false; }
virtual bool IsBool() const { return false; }
virtual bool IsList() 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 TransitionInterpolation;
friend class PairwisePrimitiveInterpolation;
// Keep interpolate private, but allow calls within the hierarchy without
// knowledge of type.
friend class InterpolableNumber;
friend class InterpolableList;
friend class AnimationInterpolableValueTest;
};
class CORE_EXPORT InterpolableNumber final : public InterpolableValue {
public:
static std::unique_ptr<InterpolableNumber> Create(double value) {
return base::WrapUnique(new InterpolableNumber(value));
}
bool IsNumber() const final { return true; }
double Value() const { return value_; }
bool Equals(const InterpolableValue& other) const final;
std::unique_ptr<InterpolableValue> Clone() const final {
return Create(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) { value_ = value; }
private:
void Interpolate(const InterpolableValue& to,
const double progress,
InterpolableValue& result) const final;
double value_;
explicit InterpolableNumber(double value) : 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 DISALLOW_COPY_AND_ASSIGN 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 base::WrapUnique(new InterpolableList(other));
}
static std::unique_ptr<InterpolableList> Create(wtf_size_t size) {
return base::WrapUnique(new InterpolableList(size));
}
bool IsList() const final { return true; }
void Set(wtf_size_t position, std::unique_ptr<InterpolableValue> value) {
values_[position] = std::move(value);
}
const InterpolableValue* Get(wtf_size_t position) const {
return values_[position].get();
}
std::unique_ptr<InterpolableValue>& GetMutable(wtf_size_t position) {
return values_[position];
}
wtf_size_t length() const { return 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(wtf_size_t size) : values_(size) {}
InterpolableList(const InterpolableList& other) : values_(other.length()) {
for (wtf_size_t i = 0; i < length(); i++)
Set(i, other.values_[i]->Clone());
}
Vector<std::unique_ptr<InterpolableValue>> values_;
};
DEFINE_TYPE_CASTS(InterpolableNumber,
InterpolableValue,
value,
value->IsNumber(),
value.IsNumber());
DEFINE_TYPE_CASTS(InterpolableList,
InterpolableValue,
value,
value->IsList(),
value.IsList());
} // namespace blink
#endif
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