backend/BackendManager.h

   1 /*
   2  * Copyright (C) 2020 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 #ifndef ANDROID_BACKEND_MANAGER_H
  18 #define ANDROID_BACKEND_MANAGER_H
  19
  20 #include <functional>
  21 #include <map>
  22 #include <string>
  23 #include <vector>
  24
  25 #include "Backend.h"
  26
  27 #define REGISTER_BACKEND(name_str_, backend_)                               \
  28   static int                                                                \
  29       backend = BackendManager::GetInstance()                               \
  30                     .RegisterBackend(name_str_,                             \
  31                                      []() -> std::unique_ptr<Backend> {     \
  32                                        return std::make_unique<backend_>(); \
  33                                      });
  34
  35 namespace android {
  36
  37 class BackendManager {
  38  public:
  39   using backend_constructor_t = std::function<std::unique_ptr<Backend>()>;
  40   static BackendManager &GetInstance();
  41   int RegisterBackend(const std::string &name,
  42                       backend_constructor_t backend_constructor);
  43   int SetBackendForDisplay(DrmHwcTwo::HwcDisplay *display);
  44   std::unique_ptr<Backend> GetBackendByName(std::string &name);
  45   HWC2::Error ValidateDisplay(DrmHwcTwo::HwcDisplay *display,
  46                               uint32_t *num_types, uint32_t *num_requests);
  47
  48  private:
  49   BackendManager() = default;
  50
  51   static const std::vector<std::string> kClientDevices;
  52
  53   std::map<std::string, backend_constructor_t> available_backends_;
  54 };
  55 }  // namespace android
  56
  57 #endif