| // 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 |