1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/mobile/android/base/gfx/IntSize.java Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,91 @@
1.4 +/* -*- Mode: Java; c-basic-offset: 4; tab-width: 20; indent-tabs-mode: nil; -*-
1.5 + * This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +package org.mozilla.gecko.gfx;
1.10 +
1.11 +import org.json.JSONException;
1.12 +import org.json.JSONObject;
1.13 +
1.14 +import android.util.FloatMath;
1.15 +
1.16 +public class IntSize {
1.17 + public final int width, height;
1.18 +
1.19 + public IntSize(IntSize size) { width = size.width; height = size.height; }
1.20 + public IntSize(int inWidth, int inHeight) { width = inWidth; height = inHeight; }
1.21 +
1.22 + public IntSize(FloatSize size) {
1.23 + width = Math.round(size.width);
1.24 + height = Math.round(size.height);
1.25 + }
1.26 +
1.27 + public IntSize(JSONObject json) {
1.28 + try {
1.29 + width = json.getInt("width");
1.30 + height = json.getInt("height");
1.31 + } catch (JSONException e) {
1.32 + throw new RuntimeException(e);
1.33 + }
1.34 + }
1.35 +
1.36 + public int getArea() {
1.37 + return width * height;
1.38 + }
1.39 +
1.40 + public boolean equals(IntSize size) {
1.41 + return ((size.width == width) && (size.height == height));
1.42 + }
1.43 +
1.44 + public boolean isPositive() {
1.45 + return (width > 0 && height > 0);
1.46 + }
1.47 +
1.48 + @Override
1.49 + public String toString() { return "(" + width + "," + height + ")"; }
1.50 +
1.51 + public IntSize scale(float factor) {
1.52 + return new IntSize(Math.round(width * factor),
1.53 + Math.round(height * factor));
1.54 + }
1.55 +
1.56 + /* Returns the power of two that is greater than or equal to value */
1.57 + public static int nextPowerOfTwo(int value) {
1.58 + // code taken from http://acius2.blogspot.com/2007/11/calculating-next-power-of-2.html
1.59 + if (0 == value--) {
1.60 + return 1;
1.61 + }
1.62 + value = (value >> 1) | value;
1.63 + value = (value >> 2) | value;
1.64 + value = (value >> 4) | value;
1.65 + value = (value >> 8) | value;
1.66 + value = (value >> 16) | value;
1.67 + return value + 1;
1.68 + }
1.69 +
1.70 + public IntSize nextPowerOfTwo() {
1.71 + return new IntSize(nextPowerOfTwo(width), nextPowerOfTwo(height));
1.72 + }
1.73 +
1.74 + public static boolean isPowerOfTwo(int value) {
1.75 + if (value == 0)
1.76 + return false;
1.77 + return (value & (value - 1)) == 0;
1.78 + }
1.79 +
1.80 + public static int largestPowerOfTwoLessThan(float value) {
1.81 + int val = (int)FloatMath.floor(value);
1.82 + if (val <= 0) {
1.83 + throw new IllegalArgumentException("Error: value must be > 0");
1.84 + }
1.85 + // keep dropping the least-significant set bits until only one is left
1.86 + int bestVal = val;
1.87 + while (val != 0) {
1.88 + bestVal = val;
1.89 + val &= (val - 1);
1.90 + }
1.91 + return bestVal;
1.92 + }
1.93 +}
1.94 +
