Method CreateCamera

camera/basic/src/main/cpp/camera_engine.cpp:53–101

* Create a camera object for onboard BACK_FACING camera */

 * Create a camera object for onboard BACK_FACING camera
 */
void CameraEngine::CreateCamera(void) {
  // Camera needed to be requested at the run-time from Java SDK
  // if Not granted, do nothing.
  if (!cameraGranted_ || !app_->window) {
    LOGW("Camera Sample requires Full Camera access");
    return;
  }

  int32_t displayRotation = GetDisplayRotation();
  rotation_ = displayRotation;

  camera_ = new NDKCamera();
  ASSERT(camera_, "Failed to Create CameraObject");

  int32_t facing = 0, angle = 0, imageRotation = 0;
  if (camera_->GetSensorOrientation(&facing, &angle)) {
    if (facing == ACAMERA_LENS_FACING_FRONT) {
      imageRotation = (angle + rotation_) % 360;
      imageRotation = (360 - imageRotation) % 360;
    } else {
      imageRotation = (angle - rotation_ + 360) % 360;
    }
  }
  LOGI("Phone Rotation: %d, Present Rotation Angle: %d", rotation_,
       imageRotation);
  ImageFormat view{0, 0, 0}, capture{0, 0, 0};
  camera_->MatchCaptureSizeRequest(app_->window, &view, &capture);

  ASSERT(view.width && view.height, "Could not find supportable resolution");

  // Request the necessary nativeWindow to OS
  bool portraitNativeWindow =
      (savedNativeWinRes_.width < savedNativeWinRes_.height);
  ANativeWindow_setBuffersGeometry(
      app_->window, portraitNativeWindow ? view.height : view.width,
      portraitNativeWindow ? view.width : view.height, WINDOW_FORMAT_RGBA_8888);

  yuvReader_ = new ImageReader(&view, AIMAGE_FORMAT_YUV_420_888);
  yuvReader_->SetPresentRotation(imageRotation);
  jpgReader_ = new ImageReader(&capture, AIMAGE_FORMAT_JPEG);
  jpgReader_->SetPresentRotation(imageRotation);
  jpgReader_->RegisterCallback(this, [](void* ctx, const char* str) -> void {
    reinterpret_cast<CameraEngine*>(ctx)->OnPhotoTaken(str);
  });

  // now we could create session
  camera_->CreateSession(yuvReader_->GetNativeWindow(),
                         jpgReader_->GetNativeWindow(), imageRotation);
}

void CameraEngine::DeleteCamera(void) {
  cameraReady_ = false;