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// Copyright 2015 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_NON_INTERPOLABLE_VALUE_H_
#define THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_NON_INTERPOLABLE_VALUE_H_
#include "third_party/blink/renderer/platform/wtf/ref_counted.h"
namespace blink {
// Represents components of a PropertySpecificKeyframe's value that either do
// not change or 50% flip when interpolating with an adjacent value.
class NonInterpolableValue : public RefCounted<NonInterpolableValue> {
public:
virtual ~NonInterpolableValue() = default;
typedef const void* Type;
virtual Type GetType() const = 0;
};
// These macros provide safe downcasts of NonInterpolableValue subclasses with
// debug assertions.
// See CSSDefaultInterpolationType.cpp for example usage.
#define DECLARE_NON_INTERPOLABLE_VALUE_TYPE() \
Type GetType() const final { return static_type_; } \
static Type static_type_
#define DEFINE_NON_INTERPOLABLE_VALUE_TYPE(T) \
NonInterpolableValue::Type T::static_type_ = &T::static_type_
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_CORE_ANIMATION_NON_INTERPOLABLE_VALUE_H_
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