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.camera;
  
  import android.graphics.Point;
  import android.hardware.Camera;
  import android.os.Handler;
  import android.os.Message;
  import android.util.Log;
  
  final class PreviewCallback implements Camera.PreviewCallback {
  
    private static final String TAG = PreviewCallback.class.getSimpleName();
  
    private final CameraConfigurationManager configManager;
    private final boolean useOneShotPreviewCallback;
    private Handler previewHandler;
    private int previewMessage;
  
    PreviewCallback(CameraConfigurationManager configManager, boolean useOneShotPreviewCallback) {
      this.configManager = configManager;
      this.useOneShotPreviewCallback = useOneShotPreviewCallback;
    }
  
    void setHandler(Handler previewHandler, int previewMessage) {
      this.previewHandler = previewHandler;
      this.previewMessage = previewMessage;
    }
  
    public void onPreviewFrame(byte[] data, Camera camera) {
      Point cameraResolution = configManager.getCameraResolution();
      if (!useOneShotPreviewCallback) {
        camera.setPreviewCallback(null);
      }
      if (previewHandler != null) {
        Message message = previewHandler.obtainMessage(previewMessage, cameraResolution.x,
            cameraResolution.y, data);
        message.sendToTarget();
        previewHandler = null;
      } else {
        Log.d(TAG, "Got preview callback, but no handler for it");
      }
    }
  
  }
  