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 com.cicada.player.zxing.camera;
  
  import android.content.Context;
  import android.graphics.PixelFormat;
  import android.graphics.Point;
  import android.graphics.Rect;
  import android.hardware.Camera;
  import android.os.Build;
  import android.os.Handler;
  import android.view.SurfaceHolder;
  
  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.
   *
   */
  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 = 480;
    private static final int MAX_FRAME_HEIGHT = 360;
  
    private static CameraManager cameraManager;
  
    static final int SDK_INT; // Later we can use Build.VERSION.SDK_INT
    static {
      int sdkInt;
      try {
        sdkInt = Integer.parseInt(Build.VERSION.SDK);
      } catch (NumberFormatException nfe) {
        // Just to be safe
        sdkInt = 10000;
      }
      SDK_INT = sdkInt;
    }
  
    private final Context context;
    private final CameraConfigurationManager configManager;
    private Camera camera;
    private Rect framingRect;
    private Rect framingRectInPreview;
    private boolean initialized;
    private boolean previewing;
    private final boolean useOneShotPreviewCallback;
    /**
     * 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;
    /** Autofocus callbacks arrive here, and are dispatched to the Handler which requested them. */
    private final AutoFocusCallback autoFocusCallback;
  
    /**
     * Initializes this static object with the Context of the calling Activity.
     *
     * @param context The Activity which wants to use the camera.
     */
    public static void init(Context context) {
      if (cameraManager == null) {
        cameraManager = new CameraManager(context);
      }
    }
  
    /**
     * Gets the CameraManager singleton instance.
     *
     * @return A reference to the CameraManager singleton.
     */
    public static CameraManager get() {
      return cameraManager;
    }
  
    private CameraManager(Context context) {
  
      this.context = context;
      this.configManager = new CameraConfigurationManager(context);
  
      // Camera.setOneShotPreviewCallback() has a race condition in Cupcake, so we use the older
      // Camera.setPreviewCallback() on 1.5 and earlier. For Donut and later, we need to use
      // the more efficient one shot callback, as the older one can swamp the system and cause it
      // to run out of memory. We can't use SDK_INT because it was introduced in the Donut SDK.
      //useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > Build.VERSION_CODES.CUPCAKE;
      useOneShotPreviewCallback = Integer.parseInt(Build.VERSION.SDK) > 3; // 3 = Cupcake
  
      previewCallback = new PreviewCallback(configManager, useOneShotPreviewCallback);
      autoFocusCallback = new AutoFocusCallback();
    }
  
    /**
     * 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 void openDriver(SurfaceHolder holder) throws IOException {
      if (camera == null) {
        camera = Camera.open();
        if (camera == null) {
          throw new IOException();
        }
        camera.setPreviewDisplay(holder);
  
        if (!initialized) {
          initialized = true;
          configManager.initFromCameraParameters(camera);
        }
        configManager.setDesiredCameraParameters(camera);
  
        //FIXME
   //     SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);
        //�Ƿ�ʹ��ǰ��
  //      if (prefs.getBoolean(PreferencesActivity.KEY_FRONT_LIGHT, false)) {
  //        FlashlightManager.enableFlashlight();
  //      }
        FlashlightManager.enableFlashlight();
      }
    }
  
    /**
     * Closes the camera driver if still in use.
     */
    public void closeDriver() {
      if (camera != null) {
        FlashlightManager.disableFlashlight();
        camera.release();
        camera = null;
      }
    }
  
    /**
     * Asks the camera hardware to begin drawing preview frames to the screen.
     */
    public void startPreview() {
      if (camera != null && !previewing) {
        camera.startPreview();
        previewing = true;
      }
    }
  
    /**
     * Tells the camera to stop drawing preview frames.
     */
    public void stopPreview() {
      if (camera != null && previewing) {
        if (!useOneShotPreviewCallback) {
          camera.setPreviewCallback(null);
        }
        camera.stopPreview();
        previewCallback.setHandler(null, 0);
        autoFocusCallback.setHandler(null, 0);
        previewing = false;
      }
    }
  
    /**
     * 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 void requestPreviewFrame(Handler handler, int message) {
      if (camera != null && previewing) {
        previewCallback.setHandler(handler, message);
        if (useOneShotPreviewCallback) {
          camera.setOneShotPreviewCallback(previewCallback);
        } else {
          camera.setPreviewCallback(previewCallback);
        }
      }
    }
  
    /**
     * Asks the camera hardware to perform an autofocus.
     *
     * @param handler The Handler to notify when the autofocus completes.
     * @param message The message to deliver.
     */
    public void requestAutoFocus(Handler handler, int message) {
      if (camera != null && previewing) {
        autoFocusCallback.setHandler(handler, message);
        //Log.d(TAG, "Requesting auto-focus callback");
        camera.autoFocus(autoFocusCallback);
      }
    }
  
    /**
     * 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 Rect getFramingRect() {
      Point screenResolution = configManager.getScreenResolution();
      if(screenResolution == null){
        return null;
      }
      if (framingRect == null) {
        if (camera == null) {
          return null;
        }
  
        //修改之后
        int width = screenResolution.x * 7 / 10;
        int height = screenResolution.y * 7 / 10;
  
        if(height >= width) { //竖屏
          height  = width;
        } else { //黑屏
          width = height;
        }
  
        int leftOffset = (screenResolution.x - width) / 2;
        int topOffset = (screenResolution.y - height) / 2;
        framingRect = new Rect(leftOffset, topOffset, leftOffset + width, topOffset + height);
  
      }
      return framingRect;
    }
  //  public Rect getFramingRect() {
  //    Point screenResolution = configManager.getScreenResolution();
  //    if (framingRect == null) {
  //      if (camera == null) {
  //        return null;
  //      }
  //      int width = screenResolution.x * 3 / 4;
  //      if (width < MIN_FRAME_WIDTH) {
  //        width = MIN_FRAME_WIDTH;
  //      } else if (width > MAX_FRAME_WIDTH) {
  //        width = MAX_FRAME_WIDTH;
  //      }
  //      int height = screenResolution.y * 3 / 4;
  //      if (height < MIN_FRAME_HEIGHT) {
  //        height = MIN_FRAME_HEIGHT;
  //      } else if (height > MAX_FRAME_HEIGHT) {
  //        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);
  //      Log.d(TAG, "Calculated framing rect: " + framingRect);
  //    }
  //    return framingRect;
  //  }
  
    /**
     * Like {@link #getFramingRect} but coordinates are in terms of the preview frame,
     * not UI / screen.
     */
    public Rect getFramingRectInPreview() {
      if (framingRectInPreview == null) {
        Rect rect = new Rect(getFramingRect());
        Point cameraResolution = configManager.getCameraResolution();
        Point screenResolution = configManager.getScreenResolution();
        //modify here
  //      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;
        rect.left = rect.left * cameraResolution.y / screenResolution.x;
        rect.right = rect.right * cameraResolution.y / screenResolution.x;
        rect.top = rect.top * cameraResolution.x / screenResolution.y;
        rect.bottom = rect.bottom * cameraResolution.x / screenResolution.y;
        framingRectInPreview = rect;
      }
      return framingRectInPreview;
    }
  
    /**
     * Converts the result points from still resolution coordinates to screen coordinates.
     *
     * @param points The points returned by the Reader subclass through Result.getResultPoints().
     * @return An array of Points scaled to the size of the framing rect and offset appropriately
     *         so they can be drawn in screen coordinates.
     */
    /*
    public Point[] convertResultPoints(ResultPoint[] points) {
      Rect frame = getFramingRectInPreview();
      int count = points.length;
      Point[] output = new Point[count];
      for (int x = 0; x < count; x++) {
        output[x] = new Point();
        output[x].x = frame.left + (int) (points[x].getX() + 0.5f);
        output[x].y = frame.top + (int) (points[x].getY() + 0.5f);
      }
      return output;
    }
     */
  
    /**
     * 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();
      int previewFormat = configManager.getPreviewFormat();
      String previewFormatString = configManager.getPreviewFormatString();
      switch (previewFormat) {
        // This is the standard Android format which all devices are REQUIRED to support.
        // In theory, it's the only one we should ever care about.
        case PixelFormat.YCbCr_420_SP:
        // This format has never been seen in the wild, but is compatible as we only care
        // about the Y channel, so allow it.
        case PixelFormat.YCbCr_422_SP:
          return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top,
              rect.width(), rect.height());
        default:
          // The Samsung Moment incorrectly uses this variant instead of the 'sp' version.
          // Fortunately, it too has all the Y data up front, so we can read it.
          if ("yuv420p".equals(previewFormatString)) {
            return new PlanarYUVLuminanceSource(data, width, height, rect.left, rect.top,
              rect.width(), rect.height());
          }
      }
      throw new IllegalArgumentException("Unsupported picture format: " +
          previewFormat + '/' + previewFormatString);
    }
  
  	public Context getContext() {
  		return context;
  	}
  
  }
  