content: /*
   * Copyright (C) 2008 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 org.fly.scan;
  
  import android.app.Activity;
  import android.content.Intent;
  import android.graphics.Bitmap;
  import android.graphics.BitmapFactory;
  import android.os.Bundle;
  import android.os.Handler;
  import android.os.Message;
  
  import com.google.zxing.BarcodeFormat;
  import com.google.zxing.DecodeHintType;
  import com.google.zxing.Result;
  
  import org.fly.scan.camera.CameraManager;
  import org.fly.scan.decode.DecodeThread;
  import org.fly.scan.callback.CaptureCallback;
  import org.fly.scan.callback.ScanResultPointCallback;
  
  import java.util.Collection;
  import java.util.Map;
  
  /**
   * This class handles all the messaging which comprises the state machine for capture.
   *
   * @author dswitkin@google.com (Daniel Switkin)
   */
  public final class CaptureHandler extends Handler {
  
      private final Activity activity;
      private final DecodeThread decodeThread;
      private State state;
      private final CameraManager cameraManager;
      private final CaptureCallback callback;
  
      private enum State {
          PREVIEW,
          SUCCESS,
          DONE
      }
  
      CaptureHandler(Activity activity,
                     Collection<BarcodeFormat> decodeFormats,
                     Map<DecodeHintType, ?> baseHints,
                     String characterSet,
                     CameraManager cameraManager,
                     CaptureCallback callback) {
          this.activity = activity;
          this.callback = callback;
          decodeThread = new DecodeThread(activity, decodeFormats, baseHints, characterSet,
                  new ScanResultPointCallback(), callback);
          decodeThread.start();
          state = State.SUCCESS;
  
          // Start ourselves capturing previews and decoding.
          this.cameraManager = cameraManager;
          cameraManager.startPreview();
          restartPreviewAndDecode();
      }
  
      @Override
      public void handleMessage(Message message) {
          int what = message.what;
          if (what == R.id.restart_preview) {
              restartPreviewAndDecode();
          } else if (what == R.id.decode_succeeded) {
              state = State.SUCCESS;
              Bundle bundle = message.getData();
              Bitmap barcode = null;
              float scaleFactor = 1.0f;
              if (bundle != null) {
                  byte[] compressedBitmap = bundle.getByteArray(DecodeThread.BARCODE_BITMAP);
                  if (compressedBitmap != null) {
                      barcode = BitmapFactory.decodeByteArray(compressedBitmap, 0, compressedBitmap.length, null);
                      // Mutable copy:
                      barcode = barcode.copy(Bitmap.Config.ARGB_8888, true);
                  }
                  scaleFactor = bundle.getFloat(DecodeThread.BARCODE_SCALED_FACTOR);
              }
              callback.handleDecode((Result) message.obj, barcode, scaleFactor);
          } else if (what == R.id.decode_failed) {
              // We're decoding as fast as possible, so when one decode fails, start another.
              state = State.PREVIEW;
              cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
          }
      }
  
      public void quitSynchronously() {
          state = State.DONE;
          cameraManager.stopPreview();
          Message quit = Message.obtain(decodeThread.getHandler(), R.id.quit);
          quit.sendToTarget();
          try {
              // Wait at most half a second; should be enough time, and onPause() will timeout quickly
              decodeThread.join(500L);
          } catch (InterruptedException e) {
              // continue
          }
  
          // Be absolutely sure we don't send any queued up messages
          removeMessages(R.id.decode_succeeded);
          removeMessages(R.id.decode_failed);
      }
  
      private void restartPreviewAndDecode() {
          if (state == State.SUCCESS) {
              state = State.PREVIEW;
              cameraManager.requestPreviewFrame(decodeThread.getHandler(), R.id.decode);
          }
      }
  }