JSFiddle - React, Tailwind, and code Playground

HTML

<body>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/phaser/2.6.1/phaser.js"></script>
</body>

JavaScript

var PhaserUtils = {
  /**
   * Create sprite with rounded corners
   *
   * @param {Phaser.GameObjectCreator} game
   * @param {Number} x
   * @param {Number} y
   * @param {String} src
   * @param {Number} radius
   * @return {Phaser.Sprite}
   */
  getRoundedImage: function(game, x, y, src, radius){
    var sprite  = game.make.sprite(0, 0, src);
    var bitmap  = game.make.bitmapData(sprite.width, sprite.height);
    var mask    = game.make.graphics(0, 0);

    bitmap.smoothed = false;

    mask.beginFill(0xffffff);
    mask.drawRoundedRect(0, 0, sprite.width, sprite.height, radius);
    mask.endFill();

    var maskSprite = game.make.sprite(0, 0, mask.generateTexture());

    bitmap.alphaMask(sprite, maskSprite);

    var res = game.make.sprite(x, y, bitmap);

    mask.destroy(true);
    maskSprite.destroy(true);
    sprite.destroy(true);

    return res;
  },
};

(function(){
  const game = new Phaser.Game(400, 400, Phaser.CANVAS, null, {
    preload: function(){
    	this.load.image('example', 'http://www.autostylizacja.pl/wp-content/uploads/2014/06/play.jpg');
    },
  
    create: function(){
      this.elements = {
        container: this.add.group()
      };

      for(var i = 0; i < 100; i++){
        this.elements.container.add(PhaserUtils.getRoundedImage(this.game, 0, 0, 'example', 50));
        // this.elements.container.add(this.game.make.sprite(0, 0, 'example'));
      }

			setTimeout(function(){
      	this.elements.container.removeChildren();
      }.bind(this), 2000);
    }
  });
}());