The width and height values passed to the Game constructor are now passed through Math.floor first. This ensures you can never create a game width non-integer dimensions, which has all kinds of implications - from browser performance to breaking things like TileSprite rendering (phaserjs#2262)

Author: photonstorm

README.md

@@ -293,6 +293,7 @@ If you are an exceptional JavaScript developer and would like to join the Phaser
 * Sound.onEndedHandler now sets Sound.currentTime to be Sound.durationMS (thanks @stoneman1 #2237)
 * BitmapData would always create a private `_swapCanvas` which was a clone of its main canvas used for advanced movement operations. This no longer happens. The swap canvas is created only as needed, by those functions that use it (specifically `moveH` and `moveV`), meaning a BitmapData will now use half the amount of memory it used to, and you'll have half the amount of canvas DOM elements created (unless you make heavy use of the move functions).
 * Tweens with 'yoyo' set on them couldn't be re-used again because the start and end properties were left in a reversed state. When a yoyo tween ends it now restores the reversed values (thanks @SBCGames  #2307)
+* The width and height values passed to the Game constructor are now passed through Math.floor first. This ensures you can never create a game width non-integer dimensions, which has all kinds of implications - from browser performance to breaking things like TileSprite rendering (#2262)
 
 ### Bug Fixes
 

src/core/Game.js

@@ -530,6 +530,13 @@ Phaser.Game.prototype = {
             return;
         }
 
+        //  The game width / height must be an integer
+        this.width = Math.floor(this.width);
+        this.height = Math.floor(this.height);
+
+        this._width = Math.floor(this._width);
+        this._height = Math.floor(this._height);
+
         this.onPause = new Phaser.Signal();
         this.onResume = new Phaser.Signal();
         this.onBlur = new Phaser.Signal();