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.google.zxing.decode;
  
  import android.graphics.Bitmap;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.Looper;
  import android.os.Message;
  import android.util.Log;
  
  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.jinlin.zxing.CaptureActivity;
  
  import java.io.ByteArrayOutputStream;
  import java.util.Map;
  
  import cn.jinlin.zxing.R;
  
  
  final class DecodeHandler extends Handler {
  
  	private static final String TAG = DecodeHandler.class.getSimpleName();
  
  	private final CaptureActivity activity;
  
  	private final MultiFormatReader multiFormatReader;
  
  	private boolean running = true;
  
  	DecodeHandler(CaptureActivity activity, Map<DecodeHintType, Object> hints) {
  		multiFormatReader = new MultiFormatReader();
  		multiFormatReader.setHints(hints);
  		this.activity = activity;
  	}
  
  	@Override
  	public void handleMessage(Message message) {
  		if (!running) {
  			return;
  		}
  		switch (message.what) {
  			case R.id.decode:
  				decode((byte[]) message.obj, message.arg1, message.arg2);
  				break;
  			case R.id.quit:
  				running = false;
  				Looper.myLooper().quit();
  				break;
  		}
  	}
  
  	/**
  	 * 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) {
  		long start = System.currentTimeMillis();
  		Result rawResult = null;
  
  		byte[] rotatedData = new byte[data.length];
  		for (int y = 0; y < height; y++) {
  			for (int x = 0; x < width; x++)
  				rotatedData[x * height + height - y - 1] = data[x + y * width];
  		}
  		int tmp = width;
  		width = height;
  		height = tmp;
  
  		PlanarYUVLuminanceSource source = activity.getCameraManager()
  				.buildLuminanceSource(rotatedData, width, height);
  		if (source != null) {
  			BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
  			try {
  				// 预览界面最终取到的是个bitmap，然后对其进行解码
  				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.
  			long end = System.currentTimeMillis();
  			Log.d(TAG, "Found barcode in " + (end - start) + " ms");
  			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());
  	}
  
  }
  