DecodeHandler.java

/*
 * 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.barcode;

import java.util.Hashtable;

import android.os.Bundle;
import android.os.Handler;
import android.os.Looper;
import android.os.Message;
import android.util.Log;

import com.codecomb.ufreedom.R;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.ReaderException;
import com.google.zxing.Result;
import com.google.zxing.common.HybridBinarizer;

// TODO please add an import statement for R class
// import ****.R;

final class DecodeHandler extends Handler {

  private static final String TAG = DecodeHandler.class.getSimpleName();

  private final CaptureActivity activity;
  private final MultiFormatReader multiFormatReader;

  DecodeHandler(CaptureActivity activity, Hashtable<DecodeHintType, Object> hints) {
    multiFormatReader = new MultiFormatReader();
    multiFormatReader.setHints(hints);
    this.activity = activity;
  }

  @Override
  public void handleMessage(Message message) {
    switch (message.what) {
      case R.id.decode:
        //Log.d(TAG, "Got decode message");
        decode((byte[]) message.obj, message.arg1, message.arg2);
        break;
      case R.id.quit:
        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) {
    // Log.v("DecodeHandler", data.length + "");
	 
		Log.e("CAM", "----------decode-------");
	  
	  
	  boolean isLandcap = ActivityUtil.isScreenOrientationLandscape(activity);
	  
	  if(isLandcap)
	  {
		StringBuilder tmp;
		// if the data width is 480
		{
			int x = 40;
			tmp = new StringBuilder();
			for (int y = 0; y < height; y += 20)
				tmp.append(Integer.toHexString(data[y * width + x]) + "_");
			Log.v("DecodeHandler", tmp.toString());
		}
		// if the data width is 320
		{
			int x = 40;
			tmp = new StringBuilder();
			for (int y = 0; y < width; y += 20)
				tmp.append(Integer.toHexString(data[y * height + x]) + "_");
			Log.v("DecodeHandler", tmp.toString());
		}
	  }else{
		  
			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; // Here we are swapping, that's the difference to #11
		    width = height;
		    height = tmp;
		    data = rotatedData;
		// 
	  }
	  
	// rotate the data 90 degree clockwise.
	// note that on a HTC G2, data length is 230400, but 480*320=153600,
	// which means u and v channels are not touched.
	// from the rotated data you will get a wrong image, whatever, only Y
	// channel is used.
	// check PlanarYUVLuminanceSource for more.
	// it says: "It works for any pixel format where
	// the Y channel is planar and appears first, including
	// YCbCr_420_SP and YCbCr_422_SP."
	  
   
	  
	  
	  
    long start = System.currentTimeMillis();
    Result rawResult = null;
    

  
    
   PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(data, width, height);
 //    PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(data, height, width);
    // switch width and height
    
    
 //   PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(rotatedData, height, width);
    
    BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
    try {
      rawResult = multiFormatReader.decodeWithState(bitmap);
    } catch (ReaderException re) {
      // continue
    } finally {
      multiFormatReader.reset();
    }

    if (rawResult != null) {
      long end = System.currentTimeMillis();
      Log.d(TAG, "Found barcode (" + (end - start) + " ms):\n" + rawResult.toString());
      Message message = Message.obtain(activity.getHandler(), R.id.decode_succeeded, rawResult);
      Bundle bundle = new Bundle();
      bundle.putParcelable(DecodeThread.BARCODE_BITMAP, source.renderCroppedGreyscaleBitmap());
      message.setData(bundle);
      //Log.d(TAG, "Sending decode succeeded message...");
      message.sendToTarget();
    } else {
      Message message = Message.obtain(activity.getHandler(), R.id.decode_failed);
      message.sendToTarget();
    }
  }

}