Main.java Source code

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Here is the source code for Main.java

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//package com.java2s;
/**
 * Copyright (C) 2012-2014 GREE, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */

import android.graphics.Point;

public class Main {
    /**
     * Find the smallest area that contains multiples rect defined by width & height
     *
     * @param width
     * @param height
     * @param num
     * @return
     */
    public static Point getSmallestTextureSize(final int width, final int height, final int num,
            final int maxTextureSize, final boolean forcePo2) {
        int minWidth = 0;
        int minHeight = 0;
        int minArea = Integer.MAX_VALUE;
        for (int row = 1; row <= num; row++) {
            int col = (int) Math.ceil((float) num / (float) row);
            int po2Width = forcePo2 ? getNextPO2(col * width) : col * width;
            int po2Height = forcePo2 ? getNextPO2(row * height) : row * height;
            int area = po2Width * po2Height;
            if (area < minArea && po2Width <= maxTextureSize) {
                minArea = area;
                minWidth = po2Width;
                minHeight = (po2Height < maxTextureSize) ? po2Height : maxTextureSize;
            }
        }

        return new Point(minWidth, minHeight);
    }

    /**
     * Calculates the next highest power of two for a given integer.
     *
     * @param n the number
     * @return a power of two equal to or higher than n
     */
    public static int getNextPO2(int n) {
        n -= 1;
        n = n | (n >> 1);
        n = n | (n >> 2);
        n = n | (n >> 4);
        n = n | (n >> 8);
        n = n | (n >> 16);
        n = n | (n >> 32);
        return n + 1;
    }
}