content: /*
   * Copyright (C) 2010 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.xys.libzxing.zxing.decode;
  
  import android.graphics.Bitmap;
  import android.graphics.Rect;
  import android.hardware.Camera.Size;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.Looper;
  import android.os.Message;
  
  import com.google.zxing.BinaryBitmap;
  import com.google.zxing.DecodeHintType;
  import com.google.zxing.MultiFormatReader;
  import com.google.zxing.PlanarYUVLuminanceSource;
  import com.google.zxing.ReaderException;
  import com.google.zxing.Result;
  import com.google.zxing.common.HybridBinarizer;
  import com.xys.libzxing.R;
  import com.xys.libzxing.zxing.activity.CaptureActivity;
  
  import java.io.ByteArrayOutputStream;
  import java.util.Map;
  
  public class DecodeHandler extends Handler {
  
      private final CaptureActivity activity;
      private final MultiFormatReader multiFormatReader;
      private boolean running = true;
  
      public DecodeHandler(CaptureActivity activity, Map<DecodeHintType, Object> hints) {
          multiFormatReader = new MultiFormatReader();
          multiFormatReader.setHints(hints);
          this.activity = activity;
      }
  
      private static void bundleThumbnail(PlanarYUVLuminanceSource source, Bundle bundle) {
          int[] pixels = source.renderThumbnail();
          int width = source.getThumbnailWidth();
          int height = source.getThumbnailHeight();
          Bitmap bitmap = Bitmap.createBitmap(pixels, 0, width, width, height, Bitmap.Config.ARGB_8888);
          ByteArrayOutputStream out = new ByteArrayOutputStream();
          bitmap.compress(Bitmap.CompressFormat.JPEG, 50, out);
          bundle.putByteArray(DecodeThread.BARCODE_BITMAP, out.toByteArray());
      }
  
      @Override
      public void handleMessage(Message message) {
          if (!running) {
              return;
          }
          if (message.what == R.id.decode) {
              decode((byte[]) message.obj, message.arg1, message.arg2);
  
          } else if (message.what == R.id.quit) {
              running = false;
              Looper.myLooper().quit();
  
          }
      }
  
      /**
       * Decode the data within the viewfinder rectangle, and time how long it
       * took. For efficiency, reuse the same reader objects from one decode to
       * the next.
       *
       * @param data   The YUV preview frame.
       * @param width  The width of the preview frame.
       * @param height The height of the preview frame.
       */
      private void decode(byte[] data, int width, int height) {
          Size size = activity.getCameraManager().getPreviewSize();
  
          // 这里需要将获取的data翻转一下，因为相机默认拿的的横屏的数据
          byte[] rotatedData = new byte[data.length];
          for (int y = 0; y < size.height; y++) {
              for (int x = 0; x < size.width; x++)
                  rotatedData[x * size.height + size.height - y - 1] = data[x + y * size.width];
          }
  
          // 宽高也要调整
          int tmp = size.width;
          size.width = size.height;
          size.height = tmp;
  
          Result rawResult = null;
          PlanarYUVLuminanceSource source = buildLuminanceSource(rotatedData, size.width, size.height);
          if (source != null) {
              BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
              try {
                  rawResult = multiFormatReader.decodeWithState(bitmap);
              } catch (ReaderException re) {
                  // continue
              } finally {
                  multiFormatReader.reset();
              }
          }
  
          Handler handler = activity.getHandler();
          if (rawResult != null) {
              // Don't log the barcode contents for security.
              if (handler != null) {
                  Message message = Message.obtain(handler, R.id.decode_succeeded, rawResult);
                  Bundle bundle = new Bundle();
                  bundleThumbnail(source, bundle);
                  message.setData(bundle);
                  message.sendToTarget();
              }
          } else {
              if (handler != null) {
                  Message message = Message.obtain(handler, R.id.decode_failed);
                  message.sendToTarget();
              }
          }
  
      }
  
      /**
       * 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 = activity.getCropRect();
          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);
      }
  
  }
  