1 /*
2  * Copyright (c) 2023-2023 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 BRRIGHTNESS_DIMMING_H
17 #define BRRIGHTNESS_DIMMING_H
18 
19 #include <atomic>
20 #include <cstdint>
21 #include <event_handler.h>
22 #include <event_runner.h>
23 #include "ffrt_utils.h"
24 #include <iosfwd>
25 #include <memory>
26 #include <string>
27 
28 #include "brightness_dimming_callback.h"
29 #include "inner_event.h"
30 
31 namespace OHOS {
32 namespace DisplayPowerMgr {
33 class BrightnessDimming : public std::enable_shared_from_this<BrightnessDimming> {
34 public:
35     BrightnessDimming(const std::string& name, std::shared_ptr<BrightnessDimmingCallback>& callback);
36     virtual ~BrightnessDimming() = default;
37     BrightnessDimming(const BrightnessDimming&) = delete;
38     BrightnessDimming& operator=(const BrightnessDimming&) = delete;
39     BrightnessDimming(BrightnessDimming&&) = delete;
40     BrightnessDimming& operator=(BrightnessDimming&&) = delete;
41 
42     void StartDimming(uint32_t from, uint32_t to, uint32_t duration);
43     void StopDimming();
44     bool IsDimming() const;
45     uint32_t GetDimmingUpdateTime() const;
46     bool Init();
47     void Reset();
48 private:
49     static const uint32_t DEFAULT_UPDATE_TIME = 32;
50     static const int32_t STRIDE_ABSOLUTE_MIN = 1;
51 
52     void NextStep();
53 
54     std::string mName{};
55     std::shared_ptr<BrightnessDimmingCallback> mCallback{};
56     std::atomic_bool mDimming{};
57     std::atomic_uint32_t mFromBrightness{};
58     std::atomic_uint32_t mToBrightness{};
59     std::atomic_uint32_t mDuration{};
60     std::atomic_uint32_t mUpdateTime{};
61     std::atomic_uint32_t mTotalSteps{};
62     std::atomic_int32_t mStride{};
63     std::atomic_uint32_t mCurrentBrightness{};
64     std::atomic_uint32_t mCurrentStep{};
65     std::shared_ptr<PowerMgr::FFRTQueue> mQueue;
66 };
67 } // namespace DisplayPowerMgr
68 } // namespace OHOS
69 #endif // BRRIGHTNESS_DIMMING_H