The Tor Browser: mobile/android/base/gfx/IntSize.java@b8a032363ba2

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-

     2  * This Source Code Form is subject to the terms of the Mozilla Public

     3  * License, v. 2.0. If a copy of the MPL was not distributed with this

     4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 package org.mozilla.gecko.gfx;

     8 import org.json.JSONException;

     9 import org.json.JSONObject;

    11 import android.util.FloatMath;

    13 public class IntSize {

    14     public final int width, height;

    16     public IntSize(IntSize size) { width = size.width; height = size.height; }

    17     public IntSize(int inWidth, int inHeight) { width = inWidth; height = inHeight; }

    19     public IntSize(FloatSize size) {

    20         width = Math.round(size.width);

    21         height = Math.round(size.height);

    22     }

    24     public IntSize(JSONObject json) {

    25         try {

    26             width = json.getInt("width");

    27             height = json.getInt("height");

    28         } catch (JSONException e) {

    29             throw new RuntimeException(e);

    30         }

    31     }

    33     public int getArea() {

    34         return width * height;

    35     }

    37     public boolean equals(IntSize size) {

    38         return ((size.width == width) && (size.height == height));

    39     }

    41     public boolean isPositive() {

    42         return (width > 0 && height > 0);

    43     }

    45     @Override

    46     public String toString() { return "(" + width + "," + height + ")"; }

    48     public IntSize scale(float factor) {

    49         return new IntSize(Math.round(width * factor),

    50                            Math.round(height * factor));

    51     }

    53     /* Returns the power of two that is greater than or equal to value */

    54     public static int nextPowerOfTwo(int value) {

    55         // code taken from http://acius2.blogspot.com/2007/11/calculating-next-power-of-2.html

    56         if (0 == value--) {

    57             return 1;

    58         }

    59         value = (value >> 1) | value;

    60         value = (value >> 2) | value;

    61         value = (value >> 4) | value;

    62         value = (value >> 8) | value;

    63         value = (value >> 16) | value;

    64         return value + 1;

    65     }

    67     public IntSize nextPowerOfTwo() {

    68         return new IntSize(nextPowerOfTwo(width), nextPowerOfTwo(height));

    69     }

    71     public static boolean isPowerOfTwo(int value) {

    72         if (value == 0)

    73             return false;

    74         return (value & (value - 1)) == 0;

    75     }

    77     public static int largestPowerOfTwoLessThan(float value) {

    78         int val = (int)FloatMath.floor(value);

    79         if (val <= 0) {

    80             throw new IllegalArgumentException("Error: value must be > 0");

    81         }

    82         // keep dropping the least-significant set bits until only one is left

    83         int bestVal = val;

    84         while (val != 0) {

    85             bestVal = val;

    86             val &= (val - 1);

    87         }

    88         return bestVal;

    89     }

    90 }

The Tor Browser / file revision