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// Copyright 2015 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_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_