Math.getNextPowerOfTwo will get the next power of two for the given value.

Math.isPowerOfTwo will return a boolean if the given width and height are a power of two.

Author: photonstorm

README.md

@@ -338,6 +338,10 @@ You can read all about the philosophy behind Lazer [here](http://phaser.io/news/
 * PIXI.TilingSprite has been removed, and all functionality merged in to Phaser.TileSprite, to cut down on the number of internal classes and inheritance going on.
 * PIXI.CanvasPool has been moved into the Phaser `utils` folder, and renamed to `Phaser.CanvasPool`. All references to PIXI.CanvasPool have been updated to match the new namespace.
 * PIXI.EarCut has been moved into the Phaser `utils` folder, and renamed to `Phaser.EarCut`. All references to PIXI.EarCut have been updated to match the new namespace.
+* Device.canHandleAlpha is a new boolean property that stores is the browser is capable of tinting with alpha.
+* Device.canUseMultiply is a new boolean property that stores whether or not the Canvas BlendModes are supported, consequently the ability to tint using the multiply method.
+* Math.getNextPowerOfTwo will get the next power of two for the given value.
+* Math.isPowerOfTwo will return a boolean if the given width and height are a power of two.
 
 ### Bug Fixes
 
@@ -360,6 +364,7 @@ Please note that Phaser uses a custom build of Pixi and always has done. The fol
 * PIXI.RenderTexture has been removed as it's no longer used internally.
 * PIXI.TileSprite has been removed as it's no longer used internally.
 * PIXI.EarCut has been removed as it's no longer used internally.
+* PIXI.Utils has been removed. All functionality is now available in Phaser.
 
 For changes in previous releases please see the extensive [Version History](https://github.com/photonstorm/phaser/blob/master/CHANGELOG.md).
 

src/math/Math.js

@@ -23,6 +23,49 @@ Phaser.Math = {
     */
     PI2: Math.PI * 2,
 
+    /**
+    * Given a number, this function returns the closest number that is a power of two.
+    * This function is from the Starling Framework.
+    *
+    * @method Phaser.Math#getNextPowerOfTwo
+    * @param {number} value - The value to get the closest power of two from.
+    * @return {number} The closest number that is a power of two.
+    */
+    getNextPowerOfTwo: function (value) {
+
+        if (value > 0 && (value & (value - 1)) === 0)
+        {
+            //  http://goo.gl/D9kPj
+            return value;
+        }
+        else
+        {
+            var result = 1;
+
+            while (result < value)
+            {
+                result <<= 1;
+            }
+
+            return result;
+        }
+
+    },
+
+    /**
+    * Checks if the given dimensions make a power of two texture.
+    * 
+    * @method Phaser.Math#isPowerOfTwo
+    * @param {number} width - The width to check.
+    * @param {number} height - The height to check.
+    * @return {boolean} True if the width and height are a power of two.
+    */
+    isPowerOfTwo: function (width, height) {
+
+        return (width > 0 && (width & (width - 1)) === 0 && height > 0 && (height & (height - 1)) === 0);
+
+    },
+
     /**
     * Returns a random float in the range `[min, max)`. If these parameters are not in order than they will be put in order.
     * Default is 0 for `min` and 1 for `max`.

typescript/phaser.d.ts

@@ -2590,8 +2590,10 @@ declare module Phaser {
         static fuzzyGreaterThan(a: number, b: number, epsilon?: number): boolean;
         static fuzzyLessThan(a: number, b: number, epsilon?: number): boolean;
         static getShortestAngle(angle1: number, angle2: number): number;
+        static getNextPowerOfTwo(value: number): number;
         static isEven(n: number): boolean;
         static isOdd(n: number): boolean;
+        static isPowerOfTwo(width: number, height: number): boolean;
         static linear(p0: number, p1: number, t: number): number;
         static linearInterpolation(v: number[], k: number): number;
         static mapLinear(x: number, a1: number, a2: number, b1: number, b2: number): number;