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| 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 | |
| 6 /** @file hello_world.c | |
| 7 * This example demonstrates loading, running and scripting a very simple | |
| 8 * NaCl module. | |
| 9 */ | |
| 10 #include <stdio.h> | |
| 11 #include <stdlib.h> | |
| 12 #include <string.h> | |
| 13 | |
| 14 #include "ppapi/c/pp_errors.h" | |
| 15 #include "ppapi/c/pp_module.h" | |
| 16 #include "ppapi/c/pp_var.h" | |
| 17 #include "ppapi/c/ppb.h" | |
| 18 #include "ppapi/c/ppb_instance.h" | |
| 19 #include "ppapi/c/ppb_messaging.h" | |
| 20 #include "ppapi/c/ppb_var.h" | |
| 21 #include "ppapi/c/ppp.h" | |
| 22 #include "ppapi/c/ppp_instance.h" | |
| 23 #include "ppapi/c/ppp_messaging.h" | |
| 24 | |
| 25 | |
| 26 static PPB_Messaging* ppb_messaging_interface = NULL; | |
| 27 static PPB_Var* ppb_var_interface = NULL; | |
| 28 | |
| 29 | |
| 30 /** | |
| 31 * Creates new string PP_Var from C string. The resulting object will be a | |
| 32 * refcounted string object. It will be AddRef()ed for the caller. When the | |
| 33 * caller is done with it, it should be Release()d. | |
| 34 * @param[in] str C string to be converted to PP_Var | |
| 35 * @return PP_Var containing string. | |
| 36 */ | |
| 37 static struct PP_Var CStrToVar(const char* str) { | |
| 38 if (ppb_var_interface != NULL) { | |
| 39 return ppb_var_interface->VarFromUtf8(str, strlen(str)); | |
| 40 } | |
| 41 return PP_MakeUndefined(); | |
| 42 } | |
| 43 | |
| 44 | |
| 45 /** | |
| 46 * Called when the NaCl module is instantiated on the web page. The identifier | |
| 47 * of the new instance will be passed in as the first argument (this value is | |
| 48 * generated by the browser and is an opaque handle). This is called for each | |
| 49 * instantiation of the NaCl module, which is each time the <embed> tag for | |
| 50 * this module is encountered. | |
| 51 * | |
| 52 * If this function reports a failure (by returning @a PP_FALSE), the NaCl | |
| 53 * module will be deleted and DidDestroy will be called. | |
| 54 * @param[in] instance The identifier of the new instance representing this | |
| 55 * NaCl module. | |
| 56 * @param[in] argc The number of arguments contained in @a argn and @a argv. | |
| 57 * @param[in] argn An array of argument names. These argument names are | |
| 58 * supplied in the <embed> tag, for example: | |
| 59 * <embed id="nacl_module" dimensions="2"> | |
| 60 * will produce two arguments, one named "id" and one named "dimensions". | |
| 61 * @param[in] argv An array of argument values. These are the values of the | |
| 62 * arguments listed in the <embed> tag. In the above example, there will | |
| 63 * be two elements in this array, "nacl_module" and "2". The indices of | |
| 64 * these values match the indices of the corresponding names in @a argn. | |
| 65 * @return @a PP_TRUE on success. | |
| 66 */ | |
| 67 static PP_Bool Instance_DidCreate(PP_Instance instance, | |
| 68 uint32_t argc, | |
| 69 const char* argn[], | |
| 70 const char* argv[]) { | |
| 71 ppb_messaging_interface->PostMessage(instance, | |
| 72 CStrToVar("Hello World: " TCNAME)); | |
| 73 return PP_TRUE; | |
| 74 } | |
| 75 | |
| 76 | |
| 77 /** | |
| 78 * Called when the NaCl module is destroyed. This will always be called, | |
| 79 * even if DidCreate returned failure. This routine should deallocate any data | |
| 80 * associated with the instance. | |
| 81 * @param[in] instance The identifier of the instance representing this NaCl | |
| 82 * module. | |
| 83 */ | |
| 84 static void Instance_DidDestroy(PP_Instance instance) { | |
| 85 } | |
| 86 | |
| 87 /** | |
| 88 * Called when the position, the size, or the clip rect of the element in the | |
| 89 * browser that corresponds to this NaCl module has changed. | |
| 90 * @param[in] instance The identifier of the instance representing this NaCl | |
| 91 * module. | |
| 92 * @param[in] position The location on the page of this NaCl module. This is | |
| 93 * relative to the top left corner of the viewport, which changes as the | |
| 94 * page is scrolled. | |
| 95 * @param[in] clip The visible region of the NaCl module. This is relative to | |
| 96 * the top left of the plugin's coordinate system (not the page). If the | |
| 97 * plugin is invisible, @a clip will be (0, 0, 0, 0). | |
| 98 */ | |
| 99 static void Instance_DidChangeView(PP_Instance instance, | |
| 100 PP_Resource view_resource) { | |
| 101 } | |
| 102 | |
| 103 /** | |
| 104 * Notification that the given NaCl module has gained or lost focus. | |
| 105 * Having focus means that keyboard events will be sent to the NaCl module | |
| 106 * represented by @a instance. A NaCl module's default condition is that it | |
| 107 * will not have focus. | |
| 108 * | |
| 109 * Note: clicks on NaCl modules will give focus only if you handle the | |
| 110 * click event. You signal if you handled it by returning @a true from | |
| 111 * HandleInputEvent. Otherwise the browser will bubble the event and give | |
| 112 * focus to the element on the page that actually did end up consuming it. | |
| 113 * If you're not getting focus, check to make sure you're returning true from | |
| 114 * the mouse click in HandleInputEvent. | |
| 115 * @param[in] instance The identifier of the instance representing this NaCl | |
| 116 * module. | |
| 117 * @param[in] has_focus Indicates whether this NaCl module gained or lost | |
| 118 * event focus. | |
| 119 */ | |
| 120 static void Instance_DidChangeFocus(PP_Instance instance, | |
| 121 PP_Bool has_focus) { | |
| 122 } | |
| 123 | |
| 124 /** | |
| 125 * Handler that gets called after a full-frame module is instantiated based on | |
| 126 * registered MIME types. This function is not called on NaCl modules. This | |
| 127 * function is essentially a place-holder for the required function pointer in | |
| 128 * the PPP_Instance structure. | |
| 129 * @param[in] instance The identifier of the instance representing this NaCl | |
| 130 * module. | |
| 131 * @param[in] url_loader A PP_Resource an open PPB_URLLoader instance. | |
| 132 * @return PP_FALSE. | |
| 133 */ | |
| 134 static PP_Bool Instance_HandleDocumentLoad(PP_Instance instance, | |
| 135 PP_Resource url_loader) { | |
| 136 /* NaCl modules do not need to handle the document load function. */ | |
| 137 return PP_FALSE; | |
| 138 } | |
| 139 | |
| 140 | |
| 141 | |
| 142 /** | |
| 143 * Entry points for the module. | |
| 144 * Initialize needed interfaces: PPB_Core, PPB_Messaging and PPB_Var. | |
| 145 * @param[in] a_module_id module ID | |
| 146 * @param[in] get_browser pointer to PPB_GetInterface | |
| 147 * @return PP_OK on success, any other value on failure. | |
| 148 */ | |
| 149 PP_EXPORT int32_t PPP_InitializeModule(PP_Module a_module_id, | |
| 150 PPB_GetInterface get_browser) { | |
| 151 ppb_messaging_interface = | |
| 152 (PPB_Messaging*)(get_browser(PPB_MESSAGING_INTERFACE)); | |
| 153 ppb_var_interface = (PPB_Var*)(get_browser(PPB_VAR_INTERFACE)); | |
| 154 return PP_OK; | |
| 155 } | |
| 156 | |
| 157 | |
| 158 /** | |
| 159 * Returns an interface pointer for the interface of the given name, or NULL | |
| 160 * if the interface is not supported. | |
| 161 * @param[in] interface_name name of the interface | |
| 162 * @return pointer to the interface | |
| 163 */ | |
| 164 PP_EXPORT const void* PPP_GetInterface(const char* interface_name) { | |
| 165 if (strcmp(interface_name, PPP_INSTANCE_INTERFACE) == 0) { | |
| 166 static PPP_Instance instance_interface = { | |
| 167 &Instance_DidCreate, | |
| 168 &Instance_DidDestroy, | |
| 169 &Instance_DidChangeView, | |
| 170 &Instance_DidChangeFocus, | |
| 171 &Instance_HandleDocumentLoad, | |
| 172 }; | |
| 173 return &instance_interface; | |
| 174 } | |
| 175 return NULL; | |
| 176 } | |
| 177 | |
| 178 | |
| 179 /** | |
| 180 * Called before the plugin module is unloaded. | |
| 181 */ | |
| 182 PP_EXPORT void PPP_ShutdownModule() { | |
| 183 } | |
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