Main.java Source code

Introduction

Here is the source code for Main.java

Source

//package com.java2s;
/*
 * Jitsi, the OpenSource Java VoIP and Instant Messaging client.
 *
 * Copyright @ 2015 Atlassian Pty Ltd
 *
 * 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.
 */

import android.graphics.*;

public class Main {
    /**
     * Creates a <tt>Bitmap</tt> from the given image byte array and scales
     * it to the given <tt>width</tt> and <tt>height</tt>.
     *
     * @param imageBytes the raw image data
     * @param reqWidth the width to which to scale the image
     * @param reqHeight the height to which to scale the image
     * @return the newly created <tt>Bitmap</tt>
     */
    static public Bitmap scaledBitmapFromBytes(byte[] imageBytes, int reqWidth, int reqHeight) {
        // First decode with inJustDecodeBounds=true to check dimensions
        final BitmapFactory.Options options = new BitmapFactory.Options();
        options.inJustDecodeBounds = true;
        BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length, options);

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

        // Decode bitmap with inSampleSize set
        options.inJustDecodeBounds = false;
        return BitmapFactory.decodeByteArray(imageBytes, 0, imageBytes.length, options);
    }

    /**
     * Calculates <tt>options.inSampleSize</tt> for requested width and height.
     * @param options the <tt>Options</tt> object that contains image
     *                <tt>outWidth</tt> and <tt>outHeight</tt>.
     * @param reqWidth requested width.
     * @param reqHeight requested height.
     * @return <tt>options.inSampleSize</tt> for requested width and height.
     */
    public static 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) {

            final int halfHeight = height / 2;
            final int halfWidth = width / 2;

            // Calculate the largest inSampleSize value that is a power of 2
            // and keeps both height and width larger than the requested height
            // and width.
            while ((halfHeight / inSampleSize) > reqHeight && (halfWidth / inSampleSize) > reqWidth) {
                inSampleSize *= 2;
            }
        }

        return inSampleSize;
    }
}