Android Open Source - PICwidget Bitmap Util

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2014 Jason J./*  w w  w.jav  a2  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.ovrhere.android.picwidget.utils;

import java.io.ByteArrayOutputStream;
import java.io.FileNotFoundException;
import java.io.InputStream;

import android.content.Context;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;

/**
 * Collection of utilities useful for bitmaps.
 * @author Jason J. 
 * @version 0.1.0-20140819
 */
public class BitmapUtil {
  /** Class name for debugging purposes. */
  @SuppressWarnings("unused")
  final static private String CLASS_NAME = BitmapUtil.class.getSimpleName();
  /** Used for debugging. */
  final static private boolean DEBUG = false;
  
  /** Converts bitmap into byte array
   * @param bitmap The bitmap to convert
   * @return The byte array of the bitmap (assumes png).
   */
  public static byte[] bitmapToBytes(Bitmap bitmap){
    ByteArrayOutputStream stream = new ByteArrayOutputStream();
    bitmap.compress(Bitmap.CompressFormat.PNG, 100, stream);
    bitmap.recycle();
    return stream.toByteArray();
  }
  
  /** Scales down the bitmap. If smaller than the size given, 
   * the same bitmap is returned.
   * @param bitmap The bitmap to resize.
   * @param pxSize The side of the largest side.
   * @return A bitmap at most pxSize long/wide
   */
  public static Bitmap scaleDownBitmap(Bitmap bitmap, int pxSize){
    int dstWidth =  bitmap.getWidth();
    int dstHeight = bitmap.getHeight();
    if (dstWidth > dstHeight){
      if (dstWidth <= pxSize){
        //if the same, do not resize.
        return bitmap;
      }
      dstHeight *= (float) ((float)pxSize/(float)dstWidth);//scale the height;
      dstWidth = pxSize;
    } else {
      if (dstHeight <= pxSize){
        return bitmap;
      }
      dstWidth*= (float) ((float)pxSize/(float)dstHeight);//scale the height;
      dstHeight  = pxSize;
    }
    return Bitmap.createScaledBitmap(bitmap, dstWidth, dstHeight, false);
  }
  
  /**
   * Reads (bitmap) file from internal and returns it's bitmap.
   * @param context The currenct context.
   * @param fileName The file name 
   * @return The bitmap on success, <code>null</code> when file not found.
   */
  public static Bitmap readBitmapFromInternal(Context context, 
      String fileName){
    try {
      InputStream in = context.openFileInput(fileName);
      return BitmapFactory.decodeStream(in);
    } catch (FileNotFoundException e) {
      if (DEBUG){
        e.printStackTrace();
      }
    }
    return null;
  }
}

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