content: /*
   * Copyright (C) 2008 ZXing authors
   *
   * 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.
   */
  
  package org.fly.scan.camera;
  
  import android.content.Context;
  import android.graphics.Point;
  import android.graphics.Rect;
  import android.hardware.Camera;
  import android.os.Handler;
  import android.util.Log;
  import android.view.SurfaceHolder;
  import com.google.zxing.PlanarYUVLuminanceSource;
  
  import org.fly.scan.camera.open.OpenCamera;
  import org.fly.scan.camera.open.OpenCameraInterface;
  
  import java.io.IOException;
  
  /**
   * This object wraps the Camera service object and expects to be the only one talking to it. The
   * implementation encapsulates the steps needed to take preview-sized images, which are used for
   * both preview and decoding.
   *
   * @author dswitkin@google.com (Daniel Switkin)
   */
  @SuppressWarnings("deprecation") // camera APIs
  public final class CameraManager {
  
      private static final String TAG = CameraManager.class.getSimpleName();
  
      private static final int MIN_FRAME_WIDTH = 240;
      private static final int MIN_FRAME_HEIGHT = 240;
      private static final int MAX_FRAME_WIDTH = 1200; // = 5/8 * 1920
      private static final int MAX_FRAME_HEIGHT = 675; // = 5/8 * 1080
  
      private final Context context;
      private final CameraConfigurationManager configManager;
      private OpenCamera camera;
      private AutoFocusManager autoFocusManager;
      private Rect framingRect;
      private Rect framingRectInPreview;
      private boolean initialized;
      private boolean previewing;
      private int requestedCameraId = OpenCameraInterface.NO_REQUESTED_CAMERA;
      private int requestedFramingRectWidth;
      private int requestedFramingRectHeight;
      /**
       * Preview frames are delivered here, which we pass on to the registered handler. Make sure to
       * clear the handler so it will only receive one message.
       */
      private final PreviewCallback previewCallback;
  
      public CameraManager(Context context) {
          this.context = context;
          this.configManager = new CameraConfigurationManager(context);
          previewCallback = new PreviewCallback(configManager);
      }
  
      /**
       * Opens the camera driver and initializes the hardware parameters.
       *
       * @param holder The surface object which the camera will draw preview frames into.
       * @throws IOException Indicates the camera driver failed to open.
       */
      public synchronized void openDriver(SurfaceHolder holder) throws IOException {
          OpenCamera theCamera = camera;
          if (theCamera == null) {
              theCamera = OpenCameraInterface.open(requestedCameraId);
              if (theCamera == null) {
                  throw new IOException("Camera.open() failed to return object from driver");
              }
              camera = theCamera;
          }
  
          if (!initialized) {
              initialized = true;
              configManager.initFromCameraParameters(theCamera);
              if (requestedFramingRectWidth > 0 && requestedFramingRectHeight > 0) {
                  setManualFramingRect(requestedFramingRectWidth, requestedFramingRectHeight);
                  requestedFramingRectWidth = 0;
                  requestedFramingRectHeight = 0;
              }
          }
  
          Camera cameraObject = theCamera.getCamera();
          Camera.Parameters parameters = cameraObject.getParameters();
          String parametersFlattened = parameters == null ? null : parameters.flatten(); // Save these, temporarily
          try {
              configManager.setDesiredCameraParameters(theCamera, false);
          } catch (RuntimeException re) {
              // Driver failed
              Log.w(TAG, "Camera rejected parameters. Setting only minimal safe-mode parameters");
              Log.i(TAG, "Resetting to saved camera params: " + parametersFlattened);
              // Reset:
              if (parametersFlattened != null) {
                  parameters = cameraObject.getParameters();
                  parameters.unflatten(parametersFlattened);
                  try {
                      cameraObject.setParameters(parameters);
                      configManager.setDesiredCameraParameters(theCamera, true);
                  } catch (RuntimeException re2) {
                      // Well, darn. Give up
                      Log.w(TAG, "Camera rejected even safe-mode parameters! No configuration");
                  }
              }
          }
          cameraObject.setPreviewDisplay(holder);
  
      }
  
      public synchronized boolean isOpen() {
          return camera != null;
      }
  
      /**
       * Closes the camera driver if still in use.
       */
      public synchronized void closeDriver() {
          if (camera != null) {
              camera.getCamera().release();
              camera = null;
              // Make sure to clear these each time we close the camera, so that any scanning rect
              // requested by intent is forgotten.
              framingRect = null;
              framingRectInPreview = null;
          }
      }
  
      /**
       * Asks the camera hardware to begin drawing preview frames to the screen.
       */
      public synchronized void startPreview() {
          OpenCamera theCamera = camera;
          if (theCamera != null && !previewing) {
              theCamera.getCamera().startPreview();
              previewing = true;
              autoFocusManager = new AutoFocusManager(context, theCamera.getCamera());
          }
      }
  
      /**
       * Tells the camera to stop drawing preview frames.
       */
      public synchronized void stopPreview() {
          if (autoFocusManager != null) {
              autoFocusManager.stop();
              autoFocusManager = null;
          }
          if (camera != null && previewing) {
              camera.getCamera().stopPreview();
              previewCallback.setHandler(null, 0);
              previewing = false;
          }
      }
  
      /**
       * 设置灯光
       * @param newSetting if {@code true}, light should be turned on if currently off. And vice versa.
       */
      public synchronized void setTorch(boolean newSetting) {
          OpenCamera theCamera = camera;
          if (theCamera != null && newSetting != configManager.getTorchState(theCamera.getCamera())) {
              boolean wasAutoFocusManager = autoFocusManager != null;
              if (wasAutoFocusManager) {
                  autoFocusManager.stop();
                  autoFocusManager = null;
              }
              configManager.setTorch(theCamera.getCamera(), newSetting);
              if (wasAutoFocusManager) {
                  autoFocusManager = new AutoFocusManager(context, theCamera.getCamera());
                  autoFocusManager.start();
              }
          }
      }
  
      /**
       * A single preview frame will be returned to the handler supplied. The data will arrive as byte[]
       * in the message.obj field, with width and height encoded as message.arg1 and message.arg2,
       * respectively.
       *
       * @param handler The handler to send the message to.
       * @param message The what field of the message to be sent.
       */
      public synchronized void requestPreviewFrame(Handler handler, int message) {
          OpenCamera theCamera = camera;
          if (theCamera != null && previewing) {
              previewCallback.setHandler(handler, message);
              theCamera.getCamera().setOneShotPreviewCallback(previewCallback);
          }
      }
  
      /**
       * Calculates the framing rect which the UI should draw to show the user where to place the
       * barcode. This target helps with alignment as well as forces the user to hold the device
       * far enough away to ensure the image will be in focus.
       *
       * @return The rectangle to draw on screen in window coordinates.
       */
      public synchronized Rect getFramingRect() {
          if (framingRect == null) {
              if (camera == null) {
                  return null;
              }
              Point screenResolution = configManager.getScreenResolution();
              if (screenResolution == null) {
                  // Called early, before init even finished
                  return null;
              }
  
              int width = findDesiredDimensionInRange(screenResolution.x, MIN_FRAME_WIDTH, MAX_FRAME_WIDTH);
              int height = findDesiredDimensionInRange(screenResolution.y, MIN_FRAME_HEIGHT, MAX_FRAME_HEIGHT);
  
              int leftOffset = (screenResolution.x - width) / 2;
              int topOffset = (screenResolution.y - height) / 2;
              framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);
          }
          return framingRect;
      }
  
      private static int findDesiredDimensionInRange(int resolution, int hardMin, int hardMax) {
          int dim = 5 * resolution / 8; // Target 5/8 of each dimension
          if (dim < hardMin) {
              return hardMin;
          }
          return Math.min(dim, hardMax);
      }
  
      /**
       * Like {@link #getFramingRect} but coordinates are in terms of the preview frame,
       * not UI / screen.
       *
       * @return {@link Rect} expressing barcode scan area in terms of the preview size
       */
      public synchronized Rect getFramingRectInPreview() {
          if (framingRectInPreview == null) {
              Rect framingRect = getFramingRect();
              if (framingRect == null) {
                  return null;
              }
              Rect rect = new Rect(framingRect);
              Point cameraResolution = configManager.getCameraResolution();
              Point screenResolution = configManager.getScreenResolution();
              if (cameraResolution == null || screenResolution == null) {
                  // Called early, before init even finished
                  return null;
              }
              rect.left = rect.left * cameraResolution.x / screenResolution.x;
              rect.right = rect.right * cameraResolution.x / screenResolution.x;
              rect.top = rect.top * cameraResolution.y / screenResolution.y;
              rect.bottom = rect.bottom * cameraResolution.y / screenResolution.y;
              framingRectInPreview = rect;
          }
          return framingRectInPreview;
      }
  
  
      /**
       * Allows third party apps to specify the camera ID, rather than determine
       * it automatically based on available cameras and their orientation.
       *
       * @param cameraId camera ID of the camera to use. A negative value means "no preference".
       */
      public synchronized void setManualCameraId(int cameraId) {
          requestedCameraId = cameraId;
      }
  
      /**
       * Allows third party apps to specify the scanning rectangle dimensions, rather than determine
       * them automatically based on screen resolution.
       *
       * @param width The width in pixels to scan.
       * @param height The height in pixels to scan.
       */
      public synchronized void setManualFramingRect(int width, int height) {
          if (initialized) {
              Point screenResolution = configManager.getScreenResolution();
              if (width > screenResolution.x) {
                  width = screenResolution.x;
              }
              if (height > screenResolution.y) {
                  height = screenResolution.y;
              }
              int leftOffset = (screenResolution.x - width) / 2;
              int topOffset = (screenResolution.y - height) / 2;
              framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);
              Log.d(TAG, "Calculated manual framing rect: " + framingRect);
              framingRectInPreview = null;
          } else {
              requestedFramingRectWidth = width;
              requestedFramingRectHeight = height;
          }
      }
  
      /**
       * A factory method to build the appropriate LuminanceSource object based on the format
       * of the preview buffers, as described by Camera.Parameters.
       *
       * @param data A preview frame.
       * @param width The width of the image.
       * @param height The height of the image.
       * @return A PlanarYUVLuminanceSource instance.
       */
      public PlanarYUVLuminanceSource buildLuminanceSource(byte[] data, int width, int height) {
          Rect rect = getFramingRectInPreview();
          if (rect == null) {
              return null;
          }
          // Go ahead and assume it's YUV rather than die.
          return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top,
                  rect.width(), rect.height(), false);
      }
  }
  