/*
 * 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.zxing.decoding;
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.ericssonlabs.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;
import com.zxing.activity.CaptureActivity;
import com.zxing.camera.CameraManager;
import com.zxing.camera.PlanarYUVLuminanceSource;

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) {
		if (message.what == R.id.decode) {
			//Log.d(TAG, "Got decode message");
			decode((byte[]) message.obj, message.arg1, message.arg2);
		}else if (message.what == R.id.quit) {
			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) {
		long start = System.currentTimeMillis();
		Result rawResult = null;

		//modify here
		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;

		PlanarYUVLuminanceSource source = CameraManager.get().buildLuminanceSource(rotatedData, width, height);
		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();
		}
	}

}

@@ -627,36 +627,8 @@
 ing;
-%0Aimport java.util.Hashtable;
 %0A%0Aim
@@ -1159,16 +1159,45 @@
 ource;%0A%0A
+import java.util.Hashtable;%0A%0A
 final cl
@@ -2922,16 +2922,336 @@
 ontinue%0A
+%09%09%09try %7B //%E8%A7%A3%E5%86%B3%E6%9D%A1%E5%BD%A2%E7%A0%81%E4%B8%8E%E9%A2%84%E8%A7%88%E6%A1%86%E7%9A%84%E6%B0%B4%E5%B9%B3%E5%80%BE%E8%A7%92%E8%B6%85%E8%BF%8730%25%E8%AF%86%E5%88%AB%E4%B8%8D%E4%BA%86%EF%BC%8C%E6%84%9F%E8%B0%A2%E7%BE%A4%E5%8F%8B alert(3339238074) %E7%9A%84%E8%B4%A1%E7%8C%AE%0A%09%09%09%09source = CameraManager.get().buildLuminanceSource(data, height, width);%0A%09%09%09%09bitmap = new BinaryBitmap(new HybridBinarizer(source));%0A%09%09%09%09rawResult = multiFormatReader.decodeWithState(bitmap);%0A%09%09%09%7D catch (Exception e) %7B%0A%09%09%09%09multiFormatReader.reset();%0A%09%09%09%7D%0A
 %09%09%7D fina

解决条形码与预览框的水平倾角超过30%识别不了，感谢群友 alert 的贡献