1 /*
2  * Copyright (c) 2022 Huawei Device Co., Ltd.
3  * Licensed under the Apache License, Version 2.0 (the "License");
4  * you may not use this file except in compliance with the License.
5  * You may obtain a copy of the License at
6  *
7  *     http://www.apache.org/licenses/LICENSE-2.0
8  *
9  * Unless required by applicable law or agreed to in writing, software
10  * distributed under the License is distributed on an "AS IS" BASIS,
11  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12  * See the License for the specific language governing permissions and
13  * limitations under the License.
14  */
15 
16 #ifndef CONTRAST_FILTER_H
17 #define CONTRAST_FILTER_H
18 
19 #include "algo_filter.h"
20 
21 namespace OHOS {
22 namespace Rosen {
23 class ContrastFilter : public AlgoFilter {
24 public:
25     // contrast value ranges from 0.0 to 4.0, with 1.0 as the normal level
26     static constexpr float DEFAULT_CONTRAST = 1.0f;
27     ContrastFilter();
~ContrastFilter()28     virtual ~ContrastFilter() {};
29     void SetValue(const std::string& key, std::shared_ptr<void> value, int size) override;
30     std::string GetVertexShader() override;
31     std::string GetFragmentShader() override;
32 
33 private:
34     void LoadFilterParams() override;
35     float contrast_ = DEFAULT_CONTRAST;
36     GLint contrastID_ = 0;
37 };
38 } // namespace Rosen
39 } // namespace OHOS
40 #endif // CONTRAST_FILTER_H