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 <errno.h> 21 22 #include <map> 23 24 #include <hardware/camera3.h> 25 26 namespace v4l2_camera_hal { 27 28 // A constant that can be used to identify an overall default. 29 static constexpr int OTHER_TEMPLATES = CAMERA3_TEMPLATE_COUNT; 30 31 // DefaultingOptionDelegate provides an interface to get default options from. 32 template <typename T> 33 class DefaultOptionDelegate { 34 public: 35 // |defaults| maps template types to default values DefaultOptionDelegate(std::map<int,T> defaults)36 DefaultOptionDelegate(std::map<int, T> defaults) 37 : defaults_(std::move(defaults)){}; ~DefaultOptionDelegate()38 virtual ~DefaultOptionDelegate(){}; 39 40 // Get a default value for a template type. Returns false if no default 41 // provided. DefaultValueForTemplate(int template_type,T * default_value)42 virtual bool DefaultValueForTemplate(int template_type, T* default_value) { 43 if (defaults_.count(template_type) > 0) { 44 // Best option is template-specific. 45 *default_value = defaults_[template_type]; 46 return true; 47 } else if (defaults_.count(OTHER_TEMPLATES)) { 48 // Fall back to a general default. 49 *default_value = defaults_[OTHER_TEMPLATES]; 50 return true; 51 } 52 53 return false; 54 }; 55 56 private: 57 std::map<int, T> defaults_; 58 }; 59 60 } // namespace v4l2_camera_hal 61 62 #endif // V4L2_CAMERA_HAL_METADATA_DEFAULT_OPTION_DELEGATE_H_ 63