Android Open Source - final_app Decode Handler

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CC0 1.0 Universal Statement of Purpose The laws of most jurisdictions throughout the world automatically confer exclusive Copyright and Related Rights (defined below) upon the creator and subsequent...

Java Source Code

/*
 * Copyright (C) 2010 ZXing authors// w ww .  j av  a  2 s  .  c  o  m
 *
 * 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.client.android;

import java.io.ByteArrayOutputStream;
import java.util.Map;

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;

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;
    }
    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) {
    long start = System.currentTimeMillis();
    Result rawResult = null;
    PlanarYUVLuminanceSource source = activity.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 = 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());
  }

}

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