text: /*
   * Copyright (C) 2010 The Android Open Source Project
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *
   */
  
  
  #define LOGI(...) ((void)__android_log_print(ANDROID_LOG_INFO, "threaded_app", __VA_ARGS__))
  #define LOGE(...) ((void)__android_log_print(ANDROID_LOG_ERROR, "threaded_app", __VA_ARGS__))
  
  /* For debug builds, always enable the debug traces in this library */
  #ifndef NDEBUG
  #  define LOGV(...)  ((void)__android_log_print(ANDROID_LOG_VERBOSE, "threaded_app", __VA_ARGS__))
  #else
  #  define LOGV(...)  ((void)0)
  #endif
  
  static void free_saved_state(struct android_app* android_app) {
      pthread_mutex_lock(&android_app->mutex);
      if (android_app->savedState != NULL) {
          free(android_app->savedState);
          android_app->savedState = NULL;
          android_app->savedStateSize = 0;
      }
      pthread_mutex_unlock(&android_app->mutex);
  }
  
  int8_t android_app_read_cmd(struct android_app* android_app) {
      int8_t cmd;
      if (read(android_app->msgread, &cmd, sizeof(cmd)) == sizeof(cmd)) {
          switch (cmd) {
              case APP_CMD_SAVE_STATE:
                  free_saved_state(android_app);
                  break;
          }
          return cmd;
      } else {
          LOGE("No data on command pipe!");
      }
      return -1;
  }
  
  static void print_cur_config(struct android_app* android_app) {
      char lang[2], country[2];
      AConfiguration_getLanguage(android_app->config, lang);
      AConfiguration_getCountry(android_app->config, country);
  
      LOGV("Config: mcc=%d mnc=%d lang=%c%c cnt=%c%c orien=%d touch=%d dens=%d "
              "keys=%d nav=%d keysHid=%d navHid=%d sdk=%d size=%d long=%d "
              "modetype=%d modenight=%d",
              AConfiguration_getMcc(android_app->config),
              AConfiguration_getMnc(android_app->config),
              lang[0], lang[1], country[0], country[1],
              AConfiguration_getOrientation(android_app->config),
              AConfiguration_getTouchscreen(android_app->config),
              AConfiguration_getDensity(android_app->config),
              AConfiguration_getKeyboard(android_app->config),
              AConfiguration_getNavigation(android_app->config),
              AConfiguration_getKeysHidden(android_app->config),
              AConfiguration_getNavHidden(android_app->config),
              AConfiguration_getSdkVersion(android_app->config),
              AConfiguration_getScreenSize(android_app->config),
              AConfiguration_getScreenLong(android_app->config),
              AConfiguration_getUiModeType(android_app->config),
              AConfiguration_getUiModeNight(android_app->config));
  }
  
  void android_app_pre_exec_cmd(struct android_app* android_app, int8_t cmd) {
      switch (cmd) {
          case APP_CMD_INPUT_CHANGED:
              LOGV("APP_CMD_INPUT_CHANGED\n");
              pthread_mutex_lock(&android_app->mutex);
              if (android_app->inputQueue != NULL) {
                  AInputQueue_detachLooper(android_app->inputQueue);
              }
              android_app->inputQueue = android_app->pendingInputQueue;
              if (android_app->inputQueue != NULL) {
                  LOGV("Attaching input queue to looper");
                  AInputQueue_attachLooper(android_app->inputQueue,
                          android_app->looper, LOOPER_ID_INPUT, NULL,
                          &android_app->inputPollSource);
              }
              pthread_cond_broadcast(&android_app->cond);
              pthread_mutex_unlock(&android_app->mutex);
              break;
  
          case APP_CMD_INIT_WINDOW:
              LOGV("APP_CMD_INIT_WINDOW\n");
              pthread_mutex_lock(&android_app->mutex);
              android_app->window = android_app->pendingWindow;
              pthread_cond_broadcast(&android_app->cond);
              pthread_mutex_unlock(&android_app->mutex);
              break;
  
          case APP_CMD_TERM_WINDOW:
              LOGV("APP_CMD_TERM_WINDOW\n");
              pthread_cond_broadcast(&android_app->cond);
              break;
  
          case APP_CMD_RESUME:
          case APP_CMD_START:
          case APP_CMD_PAUSE:
          case APP_CMD_STOP:
              LOGV("activityState=%d\n", cmd);
              pthread_mutex_lock(&android_app->mutex);
              android_app->activityState = cmd;
              pthread_cond_broadcast(&android_app->cond);
              pthread_mutex_unlock(&android_app->mutex);
              break;
  
          case APP_CMD_CONFIG_CHANGED:
              LOGV("APP_CMD_CONFIG_CHANGED\n");
              AConfiguration_fromAssetManager(android_app->config,
                      android_app->activity->assetManager);
              print_cur_config(android_app);
              break;
  
          case APP_CMD_DESTROY:
              LOGV("APP_CMD_DESTROY\n");
              android_app->destroyRequested = 1;
              break;
      }
  }
  
  void android_app_post_exec_cmd(struct android_app* android_app, int8_t cmd) {
      switch (cmd) {
          case APP_CMD_TERM_WINDOW:
              LOGV("APP_CMD_TERM_WINDOW\n");
              pthread_mutex_lock(&android_app->mutex);
              android_app->window = NULL;
              pthread_cond_broadcast(&android_app->cond);
              pthread_mutex_unlock(&android_app->mutex);
              break;
  
          case APP_CMD_SAVE_STATE:
              LOGV("APP_CMD_SAVE_STATE\n");
              pthread_mutex_lock(&android_app->mutex);
              android_app->stateSaved = 1;
              pthread_cond_broadcast(&android_app->cond);
              pthread_mutex_unlock(&android_app->mutex);
              break;
  
          case APP_CMD_RESUME:
              free_saved_state(android_app);
              break;
      }
  }
  
  static void android_app_destroy(struct android_app* android_app) {
      LOGV("android_app_destroy!");
      free_saved_state(android_app);
      pthread_mutex_lock(&android_app->mutex);
      if (android_app->inputQueue != NULL) {
          AInputQueue_detachLooper(android_app->inputQueue);
      }
      AConfiguration_delete(android_app->config);
      android_app->destroyed = 1;
      pthread_cond_broadcast(&android_app->cond);
      pthread_mutex_unlock(&android_app->mutex);
      // Can't touch android_app object after this.
  }
  
  static void process_input(struct android_app* app, struct android_poll_source* source) {
      AInputEvent* event = NULL;
      while (AInputQueue_getEvent(app->inputQueue, &event) >= 0) {
          LOGV("New input event: type=%d\n", AInputEvent_getType(event));
          if (AInputQueue_preDispatchEvent(app->inputQueue, event)) {
              continue;
          }
          int32_t handled = 0;
          if (app->onInputEvent != NULL) handled = app->onInputEvent(app, event);
          AInputQueue_finishEvent(app->inputQueue, event, handled);
      }
  }
  
  static void process_cmd(struct android_app* app, struct android_poll_source* source) {
      int8_t cmd = android_app_read_cmd(app);
      android_app_pre_exec_cmd(app, cmd);
      if (app->onAppCmd != NULL) app->onAppCmd(app, cmd);
      android_app_post_exec_cmd(app, cmd);
  }
  
  static void* android_app_entry(void* param) {
      struct android_app* android_app = (struct android_app*)param;
  
      android_app->config = AConfiguration_new();
      AConfiguration_fromAssetManager(android_app->config, android_app->activity->assetManager);
  
      print_cur_config(android_app);
  
      android_app->cmdPollSource.id = LOOPER_ID_MAIN;
      android_app->cmdPollSource.app = android_app;
      android_app->cmdPollSource.process = process_cmd;
      android_app->inputPollSource.id = LOOPER_ID_INPUT;
      android_app->inputPollSource.app = android_app;
      android_app->inputPollSource.process = process_input;
  
      ALooper* looper = ALooper_prepare(ALOOPER_PREPARE_ALLOW_NON_CALLBACKS);
      ALooper_addFd(looper, android_app->msgread, LOOPER_ID_MAIN, ALOOPER_EVENT_INPUT, NULL,
              &android_app->cmdPollSource);
      android_app->looper = looper;
  
      pthread_mutex_lock(&android_app->mutex);
      android_app->running = 1;
      pthread_cond_broadcast(&android_app->cond);
      pthread_mutex_unlock(&android_app->mutex);
  
      android_main(android_app);
  
      android_app_destroy(android_app);
      return NULL;
  }
  
  // --------------------------------------------------------------------
  // Native activity interaction (called from main thread)
  // --------------------------------------------------------------------
  
  static struct android_app* android_app_create(ANativeActivity* activity,
          void* savedState, size_t savedStateSize) {
      struct android_app* android_app = (struct android_app*)malloc(sizeof(struct android_app));
      memset(android_app, 0, sizeof(struct android_app));
      android_app->activity = activity;
  
      pthread_mutex_init(&android_app->mutex, NULL);
      pthread_cond_init(&android_app->cond, NULL);
  
      if (savedState != NULL) {
          android_app->savedState = malloc(savedStateSize);
          android_app->savedStateSize = savedStateSize;
          memcpy(android_app->savedState, savedState, savedStateSize);
      }
  
      int msgpipe[2];
      if (pipe(msgpipe)) {
          LOGE("could not create pipe: %s", strerror(errno));
          return NULL;
      }
      android_app->msgread = msgpipe[0];
      android_app->msgwrite = msgpipe[1];
  
      pthread_attr_t attr; 
      pthread_attr_init(&attr);
      pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
      pthread_create(&android_app->thread, &attr, android_app_entry, android_app);
  
      // Wait for thread to start.
      pthread_mutex_lock(&android_app->mutex);
      while (!android_app->running) {
          pthread_cond_wait(&android_app->cond, &android_app->mutex);
      }
      pthread_mutex_unlock(&android_app->mutex);
  
      return android_app;
  }
  
  static void android_app_write_cmd(struct android_app* android_app, int8_t cmd) {
      if (write(android_app->msgwrite, &cmd, sizeof(cmd)) != sizeof(cmd)) {
          LOGE("Failure writing android_app cmd: %s\n", strerror(errno));
      }
  }
  
  static void android_app_set_input(struct android_app* android_app, AInputQueue* inputQueue) {
      pthread_mutex_lock(&android_app->mutex);
      android_app->pendingInputQueue = inputQueue;
      android_app_write_cmd(android_app, APP_CMD_INPUT_CHANGED);
      while (android_app->inputQueue != android_app->pendingInputQueue) {
          pthread_cond_wait(&android_app->cond, &android_app->mutex);
      }
      pthread_mutex_unlock(&android_app->mutex);
  }
  
  static void android_app_set_window(struct android_app* android_app, ANativeWindow* window) {
      pthread_mutex_lock(&android_app->mutex);
      if (android_app->pendingWindow != NULL) {
          android_app_write_cmd(android_app, APP_CMD_TERM_WINDOW);
      }
      android_app->pendingWindow = window;
      if (window != NULL) {
          android_app_write_cmd(android_app, APP_CMD_INIT_WINDOW);
      }
      while (android_app->window != android_app->pendingWindow) {
          pthread_cond_wait(&android_app->cond, &android_app->mutex);
      }
      pthread_mutex_unlock(&android_app->mutex);
  }
  
  static void android_app_set_activity_state(struct android_app* android_app, int8_t cmd) {
      pthread_mutex_lock(&android_app->mutex);
      android_app_write_cmd(android_app, cmd);
      while (android_app->activityState != cmd) {
          pthread_cond_wait(&android_app->cond, &android_app->mutex);
      }
      pthread_mutex_unlock(&android_app->mutex);
  }
  
  static void android_app_free(struct android_app* android_app) {
      pthread_mutex_lock(&android_app->mutex);
      android_app_write_cmd(android_app, APP_CMD_DESTROY);
      while (!android_app->destroyed) {
          pthread_cond_wait(&android_app->cond, &android_app->mutex);
      }
      pthread_mutex_unlock(&android_app->mutex);
  
      close(android_app->msgread);
      close(android_app->msgwrite);
      pthread_cond_destroy(&android_app->cond);
      pthread_mutex_destroy(&android_app->mutex);
      free(android_app);
  }
  
  static void onDestroy(ANativeActivity* activity) {
      LOGV("Destroy: %p\n", activity);
      android_app_free((struct android_app*)activity->instance);
  }
  
  static void onStart(ANativeActivity* activity) {
      LOGV("Start: %p\n", activity);
      android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_START);
  }
  
  static void onResume(ANativeActivity* activity) {
      LOGV("Resume: %p\n", activity);
      android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_RESUME);
  }
  
  static void* onSaveInstanceState(ANativeActivity* activity, size_t* outLen) {
      struct android_app* android_app = (struct android_app*)activity->instance;
      void* savedState = NULL;
  
      LOGV("SaveInstanceState: %p\n", activity);
      pthread_mutex_lock(&android_app->mutex);
      android_app->stateSaved = 0;
      android_app_write_cmd(android_app, APP_CMD_SAVE_STATE);
      while (!android_app->stateSaved) {
          pthread_cond_wait(&android_app->cond, &android_app->mutex);
      }
  
      if (android_app->savedState != NULL) {
          savedState = android_app->savedState;
          *outLen = android_app->savedStateSize;
          android_app->savedState = NULL;
          android_app->savedStateSize = 0;
      }
  
      pthread_mutex_unlock(&android_app->mutex);
  
      return savedState;
  }
  
  static void onPause(ANativeActivity* activity) {
      LOGV("Pause: %p\n", activity);
      android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_PAUSE);
  }
  
  static void onStop(ANativeActivity* activity) {
      LOGV("Stop: %p\n", activity);
      android_app_set_activity_state((struct android_app*)activity->instance, APP_CMD_STOP);
  }
  
  static void onConfigurationChanged(ANativeActivity* activity) {
      struct android_app* android_app = (struct android_app*)activity->instance;
      LOGV("ConfigurationChanged: %p\n", activity);
      android_app_write_cmd(android_app, APP_CMD_CONFIG_CHANGED);
  }
  
  static void onLowMemory(ANativeActivity* activity) {
      struct android_app* android_app = (struct android_app*)activity->instance;
      LOGV("LowMemory: %p\n", activity);
      android_app_write_cmd(android_app, APP_CMD_LOW_MEMORY);
  }
  
  static void onWindowFocusChanged(ANativeActivity* activity, int focused) {
      LOGV("WindowFocusChanged: %p -- %d\n", activity, focused);
      android_app_write_cmd((struct android_app*)activity->instance,
              focused ? APP_CMD_GAINED_FOCUS : APP_CMD_LOST_FOCUS);
  }
  
  static void onNativeWindowCreated(ANativeActivity* activity, ANativeWindow* window) {
      LOGV("NativeWindowCreated: %p -- %p\n", activity, window);
      android_app_set_window((struct android_app*)activity->instance, window);
  }
  
  static void onNativeWindowDestroyed(ANativeActivity* activity, ANativeWindow* window) {
      LOGV("NativeWindowDestroyed: %p -- %p\n", activity, window);
      android_app_set_window((struct android_app*)activity->instance, NULL);
  }
  
  static void onInputQueueCreated(ANativeActivity* activity, AInputQueue* queue) {
      LOGV("InputQueueCreated: %p -- %p\n", activity, queue);
      android_app_set_input((struct android_app*)activity->instance, queue);
  }
  
  static void onInputQueueDestroyed(ANativeActivity* activity, AInputQueue* queue) {
      LOGV("InputQueueDestroyed: %p -- %p\n", activity, queue);
      android_app_set_input((struct android_app*)activity->instance, NULL);
  }
  
  void ANativeActivity_onCreate(ANativeActivity* activity,
          void* savedState, size_t savedStateSize) {
      LOGV("Creating: %p\n", activity);
      activity->callbacks->onDestroy = onDestroy;
      activity->callbacks->onStart = onStart;
      activity->callbacks->onResume = onResume;
      activity->callbacks->onSaveInstanceState = onSaveInstanceState;
      activity->callbacks->onPause = onPause;
      activity->callbacks->onStop = onStop;
      activity->callbacks->onConfigurationChanged = onConfigurationChanged;
      activity->callbacks->onLowMemory = onLowMemory;
      activity->callbacks->onWindowFocusChanged = onWindowFocusChanged;
      activity->callbacks->onNativeWindowCreated = onNativeWindowCreated;
      activity->callbacks->onNativeWindowDestroyed = onNativeWindowDestroyed;
      activity->callbacks->onInputQueueCreated = onInputQueueCreated;
      activity->callbacks->onInputQueueDestroyed = onInputQueueDestroyed;
  
      activity->instance = android_app_create(activity, savedState, savedStateSize);
  }
  