1 /* 2 * Copyright (c) 2021-2023 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 ROSEN_RENDER_SERVICE_BASE_COMMAND_RS_COMMAND_TEMPLATES_H 17 #define ROSEN_RENDER_SERVICE_BASE_COMMAND_RS_COMMAND_TEMPLATES_H 18 19 #include "command/rs_command.h" 20 #include "command/rs_command_factory.h" 21 #include "platform/common/rs_log.h" 22 #include "transaction/rs_marshalling_helper.h" 23 24 namespace OHOS { 25 namespace Rosen { 26 class RSUIDirector; 27 28 // avoiding C++ macros spliting parameters 29 #ifndef ARG 30 #define ARG(...) __VA_ARGS__ 31 #endif 32 33 // Add new RSCommand as alias of template class 34 // Explicit instantiating templates will register the unmarshalling function into RSCommandFactory. 35 // To avoid redundant registry, make sure templates only instantiated once. 36 #ifdef ROSEN_INSTANTIATE_COMMAND_TEMPLATE 37 #define ADD_COMMAND(ALIAS, TYPE) \ 38 using ALIAS = RSCommandTemplate<TYPE>; \ 39 template class RSCommandTemplate<TYPE>; 40 #else 41 #define ADD_COMMAND(ALIAS, TYPE) using ALIAS = RSCommandTemplate<TYPE>; 42 #endif 43 44 template<uint16_t commandType, uint16_t commandSubType, auto processFunc, typename... Params> 45 class RSCommandTemplate : public RSCommand { 46 public: RSCommandTemplate(const Params &...params)47 RSCommandTemplate(const Params&... params) : params_(params...) {} RSCommandTemplate(std::tuple<Params...> && params)48 RSCommandTemplate(std::tuple<Params...>&& params) : params_(std::move(params)) {} 49 ~RSCommandTemplate() override = default; 50 GetType()51 uint16_t GetType() const override 52 { 53 return commandType; 54 } GetSubType()55 uint16_t GetSubType() const override 56 { 57 return commandSubType; 58 } 59 GetNodeId()60 NodeId GetNodeId() const override 61 { 62 using idType = typename std::tuple_element<0, decltype(params_)>::type; 63 if (std::is_same<NodeId, idType>::value) { 64 return std::get<0>(params_); 65 } 66 return 0; // invalidId 67 } 68 Process(RSContext & context)69 void Process(RSContext& context) override 70 { 71 // expand the tuple to function parameters 72 std::apply([&context](auto&... args) { return (*processFunc)(context, args...); }, params_); 73 } 74 Marshalling(Parcel & parcel)75 bool Marshalling(Parcel& parcel) const override 76 { 77 return RSMarshallingHelper::Marshalling(parcel, commandType) && 78 RSMarshallingHelper::Marshalling(parcel, commandSubType) && 79 std::apply([&parcel](const auto&... args) { return RSMarshallingHelper::Marshalling(parcel, args...); }, 80 params_); 81 }; 82 Unmarshalling(Parcel & parcel)83 [[nodiscard]] static RSCommand* Unmarshalling(Parcel& parcel) 84 { 85 std::tuple<Params...> params; 86 if (!std::apply( 87 [&parcel](auto&... args) { return RSMarshallingHelper::Unmarshalling(parcel, args...); }, params)) { 88 return nullptr; 89 } 90 return new RSCommandTemplate(std::move(params)); 91 } 92 93 static inline RSCommandRegister<commandType, commandSubType, Unmarshalling> registry; 94 95 private: 96 std::tuple<Params...> params_; 97 }; 98 } // namespace Rosen 99 } // namespace OHOS 100 101 #endif // ROSEN_RENDER_SERVICE_BASE_COMMAND_RS_COMMAND_TEMPLATES_H 102