BitmapMask would become corrupted when resizing the Phaser Game, either via the Scale Manager or directly, because the framebuffer and texture it used for rendering was still at the old dimensions. The BitmapMask now listens for the Renderer RESIZE event and re-creates itself accordingly. Fix phaserjs#5399

Author: photonstorm

src/display/mask/BitmapMask.js

@@ -6,6 +6,7 @@
 
 var Class = require('../../utils/Class');
 var GameEvents = require('../../core/events');
+var RenderEvents = require('../../renderer/webgl/events');
 
 /**
  * @classdesc
@@ -72,7 +73,7 @@ var BitmapMask = new Class({
         this.bitmapMask = renderable;
 
         /**
-         * The texture used for the mask's framebuffer.
+         * The texture used for the masks framebuffer.
          *
          * @name Phaser.Display.Masks.BitmapMask#maskTexture
          * @type {WebGLTexture}
@@ -144,6 +145,8 @@ var BitmapMask = new Class({
         this.createMask();
 
         scene.sys.game.events.on(GameEvents.CONTEXT_RESTORED, this.createMask, this);
+
+        renderer.on(RenderEvents.RESIZE, this.createMask, this);
     },
 
     /**
@@ -296,6 +299,8 @@ var BitmapMask = new Class({
     {
         this.clearMask();
 
+        this.renderer.off(RenderEvents.RESIZE, this.createMask, this);
+
         this.bitmapMask = null;
         this.prevFramebuffer = null;
         this.renderer = null;