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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 NonInterpolableValue_h
#define NonInterpolableValue_h
#include "wtf/RefCounted.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() {}
typedef const void* Type;
virtual Type getType() const = 0;
};
// These macros provide safe downcasts of NonInterpolableValue subclasses with
// debug assertions.
// See CSSValueInterpolationType.cpp for example usage.
#define DECLARE_NON_INTERPOLABLE_VALUE_TYPE() \
static Type staticType; \
Type getType() const final { return staticType; }
#define DEFINE_NON_INTERPOLABLE_VALUE_TYPE(T) \
NonInterpolableValue::Type T::staticType = &T::staticType;
#define DEFINE_NON_INTERPOLABLE_VALUE_TYPE_CASTS(T) \
inline bool is##T(const NonInterpolableValue* value) { \
return !value || value->getType() == T::staticType; \
} \
DEFINE_TYPE_CASTS(T, NonInterpolableValue, value, is##T(value), \
is##T(&value));
} // namespace blink
#endif // NonInterpolableValue_h
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