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      1 /*
      2  * Copyright 2019 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 
     17 #pragma once
     18 
     19 #include <algorithm>
     20 #include <numeric>
     21 
     22 #include "android-base/stringprintf.h"
     23 
     24 #include "DisplayHardware/HWComposer.h"
     25 #include "Scheduler/SchedulerUtils.h"
     26 
     27 namespace android {
     28 namespace scheduler {
     29 
     30 /**
     31  * This class is used to encapsulate configuration for refresh rates. It holds information
     32  * about available refresh rates on the device, and the mapping between the numbers and human
     33  * readable names.
     34  */
     35 class RefreshRateConfigs {
     36 public:
     37     // Enum to indicate which vsync rate to run at. Power saving is intended to be the lowest
     38     // (eg. when the screen is in AOD mode or off), default is the old 60Hz, and performance
     39     // is the new 90Hz. Eventually we want to have a way for vendors to map these in the configs.
     40     enum class RefreshRateType { POWER_SAVING, DEFAULT, PERFORMANCE };
     41 
     42     struct RefreshRate {
     43         // This config ID corresponds to the position of the config in the vector that is stored
     44         // on the device.
     45         int configId;
     46         // Human readable name of the refresh rate.
     47         std::string name;
     48         // Refresh rate in frames per second, rounded to the nearest integer.
     49         uint32_t fps = 0;
     50         // config Id (returned from HWC2::Display::Config::getId())
     51         hwc2_config_t id;
     52     };
     53 
     54     // TODO(b/122916473): Get this information from configs prepared by vendors, instead of
     55     // baking them in.
     56     const std::map<RefreshRateType, std::shared_ptr<RefreshRate>>& getRefreshRates() const {
     57         return mRefreshRates;
     58     }
     59     std::shared_ptr<RefreshRate> getRefreshRate(RefreshRateType type) const {
     60         const auto& refreshRate = mRefreshRates.find(type);
     61         if (refreshRate != mRefreshRates.end()) {
     62             return refreshRate->second;
     63         }
     64         return nullptr;
     65     }
     66 
     67     RefreshRateType getRefreshRateType(hwc2_config_t id) const {
     68         for (const auto& [type, refreshRate] : mRefreshRates) {
     69             if (refreshRate->id == id) {
     70                 return type;
     71             }
     72         }
     73 
     74         return RefreshRateType::DEFAULT;
     75     }
     76 
     77     void populate(const std::vector<std::shared_ptr<const HWC2::Display::Config>>& configs) {
     78         mRefreshRates.clear();
     79 
     80         // This is the rate that HWC encapsulates right now when the device is in DOZE mode.
     81         mRefreshRates.emplace(RefreshRateType::POWER_SAVING,
     82                               std::make_shared<RefreshRate>(
     83                                       RefreshRate{SCREEN_OFF_CONFIG_ID, "ScreenOff", 0,
     84                                                   HWC2_SCREEN_OFF_CONFIG_ID}));
     85 
     86         if (configs.size() < 1) {
     87             ALOGE("Device does not have valid configs. Config size is 0.");
     88             return;
     89         }
     90 
     91         // Create a map between config index and vsync period. This is all the info we need
     92         // from the configs.
     93         std::vector<std::pair<int, nsecs_t>> configIdToVsyncPeriod;
     94         for (int i = 0; i < configs.size(); ++i) {
     95             configIdToVsyncPeriod.emplace_back(i, configs.at(i)->getVsyncPeriod());
     96         }
     97 
     98         std::sort(configIdToVsyncPeriod.begin(), configIdToVsyncPeriod.end(),
     99                   [](const std::pair<int, nsecs_t>& a, const std::pair<int, nsecs_t>& b) {
    100                       return a.second > b.second;
    101                   });
    102 
    103         // When the configs are ordered by the resync rate. We assume that the first one is DEFAULT.
    104         nsecs_t vsyncPeriod = configIdToVsyncPeriod[0].second;
    105         if (vsyncPeriod != 0) {
    106             const float fps = 1e9 / vsyncPeriod;
    107             const int configId = configIdToVsyncPeriod[0].first;
    108             mRefreshRates.emplace(RefreshRateType::DEFAULT,
    109                                   std::make_shared<RefreshRate>(
    110                                           RefreshRate{configId, base::StringPrintf("%2.ffps", fps),
    111                                                       static_cast<uint32_t>(fps),
    112                                                       configs.at(configId)->getId()}));
    113         }
    114 
    115         if (configs.size() < 2) {
    116             return;
    117         }
    118 
    119         // When the configs are ordered by the resync rate. We assume that the second one is
    120         // PERFORMANCE, eg. the higher rate.
    121         vsyncPeriod = configIdToVsyncPeriod[1].second;
    122         if (vsyncPeriod != 0) {
    123             const float fps = 1e9 / vsyncPeriod;
    124             const int configId = configIdToVsyncPeriod[1].first;
    125             mRefreshRates.emplace(RefreshRateType::PERFORMANCE,
    126                                   std::make_shared<RefreshRate>(
    127                                           RefreshRate{configId, base::StringPrintf("%2.ffps", fps),
    128                                                       static_cast<uint32_t>(fps),
    129                                                       configs.at(configId)->getId()}));
    130         }
    131     }
    132 
    133 private:
    134     std::map<RefreshRateType, std::shared_ptr<RefreshRate>> mRefreshRates;
    135 };
    136 
    137 } // namespace scheduler
    138 } // namespace android
    139