| // Copyright 2015 The Cobalt Authors. 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_OPACITY_FILTER_H_ |
| #define COBALT_RENDER_TREE_OPACITY_FILTER_H_ |
| |
| #include "base/logging.h" |
| |
| namespace cobalt { |
| namespace render_tree { |
| |
| // An OpacityFilter can be used to express the desire to modify a given source |
| // image to become transparent. Opacity should be a value between [0, 1] where |
| // 0 is completely invisible and 1 is fully opaque. |
| class OpacityFilter { |
| public: |
| explicit OpacityFilter(float opacity) { set_opacity(opacity); } |
| |
| bool operator==(const OpacityFilter& other) const { |
| return opacity_ == other.opacity_; |
| } |
| |
| void set_opacity(float opacity) { |
| DCHECK_LE(0.0f, opacity); |
| DCHECK_GE(1.0f, opacity); |
| opacity_ = opacity; |
| } |
| float opacity() const { return opacity_; } |
| |
| private: |
| float opacity_; |
| }; |
| |
| } // namespace render_tree |
| } // namespace cobalt |
| |
| #endif // COBALT_RENDER_TREE_OPACITY_FILTER_H_ |