content: package org.fly.scan.decode;
  
  import android.graphics.Bitmap;
  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 org.fly.scan.R;
  import org.fly.scan.callback.CaptureCallback;
  
  import java.io.ByteArrayOutputStream;
  import java.util.Map;
  
  
  public final class DecodeHandler extends Handler {
      private final MultiFormatReader multiFormatReader;
      private boolean running = true;
      private final CaptureCallback callback;
  
      public DecodeHandler(Map<DecodeHintType, Object> hints, CaptureCallback callback) {
          multiFormatReader = new MultiFormatReader();
          multiFormatReader.setHints(hints);
          this.callback = callback;
      }
  
      @Override
      public void handleMessage(Message message) {
          if (message == null || !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) {
          Result rawResult = null;
          PlanarYUVLuminanceSource source = callback.getCameraManager().buildLuminanceSource(data, width, 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 = callback.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();
              }
          }
      }
  
      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());
          bundle.putFloat(DecodeThread.BARCODE_SCALED_FACTOR, (float) width / source.getWidth());
      }
  }
  