| // 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_ |