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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_RENDER_TREE_BLUR_FILTER_H_
#define COBALT_RENDER_TREE_BLUR_FILTER_H_
#include "base/logging.h"
namespace cobalt {
namespace render_tree {
// An BlurFilter can be used to express the desire to modify a given source
// image to appear blurred. In particular, it will be convolved with a
// Gaussian kernel that has the specified standard deviation (|blur_sigma|).
// Note that |blur_sigma| must be non-negative.
class BlurFilter {
public:
// |blur_sigma| must be non-negative.
explicit BlurFilter(float blur_sigma) { set_blur_sigma(blur_sigma); }
bool operator==(const BlurFilter& other) const {
return blur_sigma_ == other.blur_sigma_;
}
void set_blur_sigma(float blur_sigma) {
DCHECK_LE(0.0f, blur_sigma);
blur_sigma_ = blur_sigma;
}
float blur_sigma() const { return blur_sigma_; }
private:
float blur_sigma_;
};
} // namespace render_tree
} // namespace cobalt
#endif // COBALT_RENDER_TREE_BLUR_FILTER_H_