Torne (Richard Coles) | 5821806 | 2012-11-14 11:43:16 +0000 | [diff] [blame] | 1 | // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | // Note that the single accessor, Module::Get(), is not actually implemented |
| 6 | // in this file. This is an intentional hook that allows users of ppapi's |
| 7 | // C++ wrapper objects to provide different semantics for how the singleton |
| 8 | // object is accessed. |
| 9 | // |
| 10 | // In general, users of ppapi will also link in ppp_entrypoints.cc, which |
| 11 | // provides a simple default implementation of Module::Get(). |
| 12 | // |
| 13 | // A notable exception where the default ppp_entrypoints will not work is |
| 14 | // when implementing "internal plugins" that are statically linked into the |
| 15 | // browser. In this case, the process may actually have multiple Modules |
| 16 | // loaded at once making a traditional "singleton" unworkable. To get around |
| 17 | // this, the users of ppapi need to get creative about how to properly |
| 18 | // implement the Module::Get() so that ppapi's C++ wrappers can find the |
| 19 | // right Module object. One example solution is to use thread local storage |
| 20 | // to change the Module* returned based on which thread is invoking the |
| 21 | // function. Leaving Module::Get() unimplemented provides a hook for |
| 22 | // implementing such behavior. |
| 23 | |
| 24 | #include "ppapi/cpp/module.h" |
| 25 | |
| 26 | #include <string.h> |
| 27 | |
| 28 | #include "ppapi/c/pp_instance.h" |
| 29 | #include "ppapi/c/pp_var.h" |
| 30 | #include "ppapi/c/ppp_input_event.h" |
| 31 | #include "ppapi/c/ppp_instance.h" |
| 32 | #include "ppapi/c/ppp_messaging.h" |
| 33 | #include "ppapi/cpp/input_event.h" |
| 34 | #include "ppapi/cpp/instance.h" |
| 35 | #include "ppapi/cpp/rect.h" |
| 36 | #include "ppapi/cpp/resource.h" |
| 37 | #include "ppapi/cpp/url_loader.h" |
| 38 | #include "ppapi/cpp/var.h" |
| 39 | #include "ppapi/cpp/view.h" |
| 40 | |
| 41 | namespace pp { |
| 42 | |
| 43 | // PPP_InputEvent implementation ----------------------------------------------- |
| 44 | |
| 45 | PP_Bool InputEvent_HandleEvent(PP_Instance pp_instance, PP_Resource resource) { |
| 46 | Module* module_singleton = Module::Get(); |
| 47 | if (!module_singleton) |
| 48 | return PP_FALSE; |
| 49 | Instance* instance = module_singleton->InstanceForPPInstance(pp_instance); |
| 50 | if (!instance) |
| 51 | return PP_FALSE; |
| 52 | |
| 53 | return PP_FromBool(instance->HandleInputEvent(InputEvent(resource))); |
| 54 | } |
| 55 | |
| 56 | const PPP_InputEvent input_event_interface = { |
| 57 | &InputEvent_HandleEvent |
| 58 | }; |
| 59 | |
| 60 | // PPP_Instance implementation ------------------------------------------------- |
| 61 | |
| 62 | PP_Bool Instance_DidCreate(PP_Instance pp_instance, |
| 63 | uint32_t argc, |
| 64 | const char* argn[], |
| 65 | const char* argv[]) { |
| 66 | Module* module_singleton = Module::Get(); |
| 67 | if (!module_singleton) |
| 68 | return PP_FALSE; |
| 69 | |
| 70 | Instance* instance = module_singleton->CreateInstance(pp_instance); |
| 71 | if (!instance) |
| 72 | return PP_FALSE; |
| 73 | module_singleton->current_instances_[pp_instance] = instance; |
| 74 | return PP_FromBool(instance->Init(argc, argn, argv)); |
| 75 | } |
| 76 | |
| 77 | void Instance_DidDestroy(PP_Instance instance) { |
| 78 | Module* module_singleton = Module::Get(); |
| 79 | if (!module_singleton) |
| 80 | return; |
| 81 | Module::InstanceMap::iterator found = |
| 82 | module_singleton->current_instances_.find(instance); |
| 83 | if (found == module_singleton->current_instances_.end()) |
| 84 | return; |
| 85 | |
| 86 | // Remove it from the map before deleting to try to catch reentrancy. |
| 87 | Instance* obj = found->second; |
| 88 | module_singleton->current_instances_.erase(found); |
| 89 | delete obj; |
| 90 | } |
| 91 | |
| 92 | void Instance_DidChangeView(PP_Instance pp_instance, |
| 93 | PP_Resource view_resource) { |
| 94 | Module* module_singleton = Module::Get(); |
| 95 | if (!module_singleton) |
| 96 | return; |
| 97 | Instance* instance = module_singleton->InstanceForPPInstance(pp_instance); |
| 98 | if (!instance) |
| 99 | return; |
| 100 | instance->DidChangeView(View(view_resource)); |
| 101 | } |
| 102 | |
| 103 | void Instance_DidChangeFocus(PP_Instance pp_instance, PP_Bool has_focus) { |
| 104 | Module* module_singleton = Module::Get(); |
| 105 | if (!module_singleton) |
| 106 | return; |
| 107 | Instance* instance = module_singleton->InstanceForPPInstance(pp_instance); |
| 108 | if (!instance) |
| 109 | return; |
| 110 | instance->DidChangeFocus(PP_ToBool(has_focus)); |
| 111 | } |
| 112 | |
| 113 | PP_Bool Instance_HandleDocumentLoad(PP_Instance pp_instance, |
| 114 | PP_Resource pp_url_loader) { |
| 115 | Module* module_singleton = Module::Get(); |
| 116 | if (!module_singleton) |
| 117 | return PP_FALSE; |
| 118 | Instance* instance = module_singleton->InstanceForPPInstance(pp_instance); |
| 119 | if (!instance) |
| 120 | return PP_FALSE; |
| 121 | return PP_FromBool(instance->HandleDocumentLoad(URLLoader(pp_url_loader))); |
| 122 | } |
| 123 | |
| 124 | static PPP_Instance instance_interface = { |
| 125 | &Instance_DidCreate, |
| 126 | &Instance_DidDestroy, |
| 127 | &Instance_DidChangeView, |
| 128 | &Instance_DidChangeFocus, |
| 129 | &Instance_HandleDocumentLoad |
| 130 | }; |
| 131 | |
| 132 | // PPP_Messaging implementation ------------------------------------------------ |
| 133 | |
| 134 | void Messaging_HandleMessage(PP_Instance pp_instance, PP_Var var) { |
| 135 | Module* module_singleton = Module::Get(); |
| 136 | if (!module_singleton) |
| 137 | return; |
| 138 | Instance* instance = module_singleton->InstanceForPPInstance(pp_instance); |
| 139 | if (!instance) |
| 140 | return; |
| 141 | instance->HandleMessage(Var(PASS_REF, var)); |
| 142 | } |
| 143 | |
| 144 | static PPP_Messaging instance_messaging_interface = { |
| 145 | &Messaging_HandleMessage |
| 146 | }; |
| 147 | |
| 148 | // Module ---------------------------------------------------------------------- |
| 149 | |
| 150 | Module::Module() : pp_module_(0), get_browser_interface_(NULL), core_(NULL) { |
| 151 | } |
| 152 | |
| 153 | Module::~Module() { |
| 154 | delete core_; |
| 155 | core_ = NULL; |
| 156 | } |
| 157 | |
| 158 | bool Module::Init() { |
| 159 | return true; |
| 160 | } |
| 161 | |
| 162 | const void* Module::GetPluginInterface(const char* interface_name) { |
| 163 | if (strcmp(interface_name, PPP_INPUT_EVENT_INTERFACE) == 0) |
| 164 | return &input_event_interface; |
| 165 | if (strcmp(interface_name, PPP_INSTANCE_INTERFACE) == 0) |
| 166 | return &instance_interface; |
| 167 | if (strcmp(interface_name, PPP_MESSAGING_INTERFACE) == 0) |
| 168 | return &instance_messaging_interface; |
| 169 | |
| 170 | // Now see if anything was dynamically registered. |
| 171 | InterfaceMap::const_iterator found = additional_interfaces_.find( |
| 172 | std::string(interface_name)); |
| 173 | if (found != additional_interfaces_.end()) |
| 174 | return found->second; |
| 175 | |
| 176 | return NULL; |
| 177 | } |
| 178 | |
| 179 | const void* Module::GetBrowserInterface(const char* interface_name) { |
| 180 | return get_browser_interface_(interface_name); |
| 181 | } |
| 182 | |
| 183 | Instance* Module::InstanceForPPInstance(PP_Instance instance) { |
| 184 | InstanceMap::iterator found = current_instances_.find(instance); |
| 185 | if (found == current_instances_.end()) |
| 186 | return NULL; |
| 187 | return found->second; |
| 188 | } |
| 189 | |
| 190 | void Module::AddPluginInterface(const std::string& interface_name, |
| 191 | const void* vtable) { |
| 192 | // Verify that we're not trying to register an interface that's already |
| 193 | // handled, and if it is, that we're re-registering with the same vtable. |
| 194 | // Calling GetPluginInterface rather than looking it up in the map allows |
| 195 | // us to also catch "internal" ones in addition to just previously added ones. |
| 196 | const void* existing_interface = GetPluginInterface(interface_name.c_str()); |
| 197 | if (existing_interface) { |
| 198 | PP_DCHECK(vtable == existing_interface); |
| 199 | return; |
| 200 | } |
| 201 | additional_interfaces_[interface_name] = vtable; |
| 202 | } |
| 203 | |
| 204 | bool Module::InternalInit(PP_Module mod, |
| 205 | PPB_GetInterface get_browser_interface) { |
| 206 | pp_module_ = mod; |
| 207 | get_browser_interface_ = get_browser_interface; |
| 208 | |
| 209 | // Get the core interface which we require to run. |
| 210 | const PPB_Core* core = reinterpret_cast<const PPB_Core*>(GetBrowserInterface( |
| 211 | PPB_CORE_INTERFACE)); |
| 212 | if (!core) |
| 213 | return false; |
| 214 | core_ = new Core(core); |
| 215 | |
| 216 | return Init(); |
| 217 | } |
| 218 | |
| 219 | } // namespace pp |