1 /* 2 * Copyright (C) 2016 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 V4L2_CAMERA_HAL_METADATA_DEFAULT_OPTION_DELEGATE_H_ 18 #define V4L2_CAMERA_HAL_METADATA_DEFAULT_OPTION_DELEGATE_H_ 19 20 #include <map> 21 22 #include <hardware/camera3.h> 23 24 namespace v4l2_camera_hal { 25 26 // A constant that can be used to identify an overall default. 27 static constexpr int OTHER_TEMPLATES = CAMERA3_TEMPLATE_COUNT; 28 29 // DefaultingOptionDelegate provides an interface to get default options from. 30 template <typename T> 31 class DefaultOptionDelegate { 32 public: 33 // |defaults| maps template types to default values DefaultOptionDelegate(std::map<int,T> defaults)34 DefaultOptionDelegate(std::map<int, T> defaults) 35 : defaults_(std::move(defaults)){}; ~DefaultOptionDelegate()36 virtual ~DefaultOptionDelegate(){}; 37 38 // Get a default value for a template type. Returns false if no default 39 // provided. DefaultValueForTemplate(int template_type,T * default_value)40 virtual bool DefaultValueForTemplate(int template_type, T* default_value) { 41 if (defaults_.count(template_type) > 0) { 42 // Best option is template-specific. 43 *default_value = defaults_[template_type]; 44 return true; 45 } else if (defaults_.count(OTHER_TEMPLATES)) { 46 // Fall back to a general default. 47 *default_value = defaults_[OTHER_TEMPLATES]; 48 return true; 49 } 50 51 return false; 52 }; 53 54 private: 55 std::map<int, T> defaults_; 56 }; 57 58 } // namespace v4l2_camera_hal 59 60 #endif // V4L2_CAMERA_HAL_METADATA_DEFAULT_OPTION_DELEGATE_H_ 61