Android Open Source - android-http Adjustable Image Processor

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright (C) 2012 the diamond:dogs|group
 *// www .  j a  v a  2  s  .com
 * 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 at.diamonddogs.service.processor;

import java.util.Random;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.util.DisplayMetrics;
import android.view.WindowManager;

/**
 * A processor that handles image post processing
 */
public class AdjustableImageProcessor extends ImageProcessor {

  private static final Logger LOGGER = LoggerFactory.getLogger(AdjustableImageProcessor.class.getSimpleName());

  private int ID = -1;

  private Context context;

  private Bitmap.Config config;

  /**
   * Default constructor
   * 
   * @param context
   *            a {@link Context}
   * @param config
   *            the bitm
   */
  public AdjustableImageProcessor(Context context, Bitmap.Config config) {
    useMemCache = false;
    this.context = context;
    this.config = config;
  }

  @Override
  protected Bitmap createParsedObjectFromByteArray(byte[] data) {
    int reqWidth = getDisplayMetrics().widthPixels;
    int reqHeight = getDisplayMetrics().heightPixels;

    return decodeSampledBitmapFromResource(data, reqWidth, reqHeight);
  }

  private DisplayMetrics getDisplayMetrics() {
    DisplayMetrics displaymetrics = new DisplayMetrics();
    WindowManager wm = (WindowManager) context.getSystemService(Context.WINDOW_SERVICE);
    wm.getDefaultDisplay().getMetrics(displaymetrics);
    return displaymetrics;
  }

  @Override
  public int getProcessorID() {
    if (ID == -1) {
      ID = new Random().nextInt();
    }
    return ID;
  }

  // thanks to android training lessons for the code
  // http://developer.android.com/training/displaying-bitmaps/load-bitmap.html
  private Bitmap decodeSampledBitmapFromResource(byte[] data, int reqWidth, int reqHeight) {

    // First decode with inJustDecodeBounds=true to check dimensions
    final BitmapFactory.Options options = new BitmapFactory.Options();
    options.inJustDecodeBounds = true;
    BitmapFactory.decodeByteArray(data, 0, data.length, options);

    // Calculate inSampleSize
    options.inSampleSize = calculateInSampleSize(options, reqWidth, reqHeight);

    // Decode bitmap with inSampleSize set
    options.inJustDecodeBounds = false;
    try {
      if (options != null) {
        options.inPreferredConfig = config;
        options.inDither = true;
      }
      return BitmapFactory.decodeByteArray(data, 0, data.length, options);
    } catch (OutOfMemoryError e) {
      System.gc();
      LOGGER.error("OutOfMemoryError", e);
      return null;
    }

  }

  private int calculateInSampleSize(BitmapFactory.Options options, int reqWidth, int reqHeight) {
    // Raw height and width of image
    final int height = options.outHeight;
    final int width = options.outWidth;
    int inSampleSize = 1;

    if (height > reqHeight || width > reqWidth) {
      if (width > height) {
        inSampleSize = Math.round((float) height / (float) reqHeight);
      } else {
        inSampleSize = Math.round((float) width / (float) reqWidth);
      }
    }
    LOGGER.error("calculated sample size: " + inSampleSize);

    return inSampleSize;
  }
}

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