1 /* 2 * Copyright 2017 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 #ifndef LOG_TAG 20 #warning "GrallocLoader.h included without LOG_TAG" 21 #endif 22 23 #include <memory> 24 25 #include <allocator-hal/2.0/Allocator.h> 26 #include <allocator-passthrough/2.0/Gralloc0Hal.h> 27 #include <allocator-passthrough/2.0/Gralloc1Hal.h> 28 #include <hardware/gralloc.h> 29 #include <hardware/hardware.h> 30 #include <log/log.h> 31 32 namespace android { 33 namespace hardware { 34 namespace graphics { 35 namespace allocator { 36 namespace V2_0 { 37 namespace passthrough { 38 39 class GrallocLoader { 40 public: load()41 static IAllocator* load() { 42 const hw_module_t* module = loadModule(); 43 if (!module) { 44 return nullptr; 45 } 46 auto hal = createHal(module); 47 if (!hal) { 48 return nullptr; 49 } 50 return createAllocator(std::move(hal)); 51 } 52 53 // load the gralloc module loadModule()54 static const hw_module_t* loadModule() { 55 const hw_module_t* module; 56 int error = hw_get_module(GRALLOC_HARDWARE_MODULE_ID, &module); 57 if (error) { 58 ALOGE("failed to get gralloc module"); 59 return nullptr; 60 } 61 62 return module; 63 } 64 65 // return the major api version of the module getModuleMajorApiVersion(const hw_module_t * module)66 static int getModuleMajorApiVersion(const hw_module_t* module) { 67 return (module->module_api_version >> 8) & 0xff; 68 } 69 70 // create an AllocatorHal instance createHal(const hw_module_t * module)71 static std::unique_ptr<hal::AllocatorHal> createHal(const hw_module_t* module) { 72 int major = getModuleMajorApiVersion(module); 73 switch (major) { 74 case 1: { 75 auto hal = std::make_unique<Gralloc1Hal>(); 76 return hal->initWithModule(module) ? std::move(hal) : nullptr; 77 } 78 case 0: { 79 auto hal = std::make_unique<Gralloc0Hal>(); 80 return hal->initWithModule(module) ? std::move(hal) : nullptr; 81 } 82 default: 83 ALOGE("unknown gralloc module major version %d", major); 84 return nullptr; 85 } 86 } 87 88 // create an IAllocator instance createAllocator(std::unique_ptr<hal::AllocatorHal> hal)89 static IAllocator* createAllocator(std::unique_ptr<hal::AllocatorHal> hal) { 90 auto allocator = std::make_unique<hal::Allocator>(); 91 return allocator->init(std::move(hal)) ? allocator.release() : nullptr; 92 } 93 }; 94 95 } // namespace passthrough 96 } // namespace V2_0 97 } // namespace allocator 98 } // namespace graphics 99 } // namespace hardware 100 } // namespace android 101