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// Copyright 2016 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#ifndef COBALT_CSSOM_FILTER_FUNCTION_H_
#define COBALT_CSSOM_FILTER_FUNCTION_H_
#include <string>
#include "cobalt/base/polymorphic_equatable.h"
namespace cobalt {
namespace cssom {
// A base class for filter functions. Filters manipulate an element's rendering.
// https://www.w3.org/TR/filter-effects-1/
class FilterFunction : public base::PolymorphicEquatable {
public:
virtual std::string ToString() const = 0;
virtual ~FilterFunction() {}
};
} // namespace cssom
} // namespace cobalt
#endif // COBALT_CSSOM_FILTER_FUNCTION_H_