BitmapUtils.java

/*
 * Copyright (C) 2012 Lightbox
 *
 * 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.zhaojian.jolly.utils;

import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.graphics.BitmapFactory.Options;
import android.util.FloatMath;

/** 
 * BitmapUtils 
 * @author Nilesh Patel
 */
public class BitmapUtils {
	/** Used to tag logs */
	@SuppressWarnings("unused")
	private static final String TAG = "BitmapUtils";
	
	public static Bitmap getSampledBitmap(String filePath, int reqWidth, int reqHeight) {		
		Options options = new Options();
		options.inJustDecodeBounds = true;
		
		BitmapFactory.decodeFile(filePath, options);
		
		// 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 = (int)FloatMath.floor(((float)height / reqHeight)+0.5f); //Math.round((float)height / (float)reqHeight);
	        } else {
	            inSampleSize = (int)FloatMath.floor(((float)width / reqWidth)+0.5f); //Math.round((float)width / (float)reqWidth);
	        }
	    }
	    
	    options.inSampleSize = inSampleSize;
	    options.inJustDecodeBounds = false;
	    	    
	    return BitmapFactory.decodeFile(filePath, options);
	}
	
	public static BitmapSize getBitmapSize(String filePath) {
		Options options = new Options();
		options.inJustDecodeBounds = true;
		
		BitmapFactory.decodeFile(filePath, options);
		
		return new BitmapSize(options.outWidth, options.outHeight);
	}
	
	public static BitmapSize getScaledSize(int originalWidth, int originalHeight, int numPixels) {
		float ratio = (float)originalWidth/originalHeight;
		
		int scaledHeight = (int)FloatMath.sqrt((float)numPixels/ratio);
		int scaledWidth = (int)(ratio * FloatMath.sqrt((float)numPixels/ratio));
				
		return new BitmapSize(scaledWidth, scaledHeight);
	}
	
	public static class BitmapSize {		
		public int width;
		public int height;
		
		public BitmapSize(int width, int height) {
			this.width = width;
			this.height = height;
		}
	}
}