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 java.io.ByteArrayOutputStream;
  import java.util.Map;
  
  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.google.zxing.activity.CaptureActivity;
  import com.jinlin.zxing.R;
  
  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;
  	}
  
  	@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) {
  		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();
  			}
  		}
  
  	}
  
  	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());
  	}
  
  	/**
  	 * 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);
  	}
  
  }
  