The Tor Browser / file comparison
comparison: mobile/android/base/gfx/IntSize.java
mobile/android/base/gfx/IntSize.java
- branch
- TOR_BUG_3246
- changeset 4
- fc2d59ddac77
equal
deleted
inserted
replaced
| -1:000000000000 | 0:e47b3a2209fe |
|---|---|
| 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/. */ | |
| 5 | |
| 6 package org.mozilla.gecko.gfx; | |
| 7 | |
| 8 import org.json.JSONException; | |
| 9 import org.json.JSONObject; | |
| 10 | |
| 11 import android.util.FloatMath; | |
| 12 | |
| 13 public class IntSize { | |
| 14 public final int width, height; | |
| 15 | |
| 16 public IntSize(IntSize size) { width = size.width; height = size.height; } | |
| 17 public IntSize(int inWidth, int inHeight) { width = inWidth; height = inHeight; } | |
| 18 | |
| 19 public IntSize(FloatSize size) { | |
| 20 width = Math.round(size.width); | |
| 21 height = Math.round(size.height); | |
| 22 } | |
| 23 | |
| 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 } | |
| 32 | |
| 33 public int getArea() { | |
| 34 return width * height; | |
| 35 } | |
| 36 | |
| 37 public boolean equals(IntSize size) { | |
| 38 return ((size.width == width) && (size.height == height)); | |
| 39 } | |
| 40 | |
| 41 public boolean isPositive() { | |
| 42 return (width > 0 && height > 0); | |
| 43 } | |
| 44 | |
| 45 @Override | |
| 46 public String toString() { return "(" + width + "," + height + ")"; } | |
| 47 | |
| 48 public IntSize scale(float factor) { | |
| 49 return new IntSize(Math.round(width * factor), | |
| 50 Math.round(height * factor)); | |
| 51 } | |
| 52 | |
| 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 } | |
| 66 | |
| 67 public IntSize nextPowerOfTwo() { | |
| 68 return new IntSize(nextPowerOfTwo(width), nextPowerOfTwo(height)); | |
| 69 } | |
| 70 | |
| 71 public static boolean isPowerOfTwo(int value) { | |
| 72 if (value == 0) | |
| 73 return false; | |
| 74 return (value & (value - 1)) == 0; | |
| 75 } | |
| 76 | |
| 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 } | |
| 91 |
