Emit From Texture

var config = {
    type: Phaser.WEBGL,
    width: 800,
    height: 600,
    backgroundColor: '#000',
    parent: 'phaser-example',
    scene: {
        preload: preload,
        create: create
    }
};

var game = new Phaser.Game(config);

function preload ()
{
        this.load.setBaseURL('https://cdn.phaserfiles.com/v355');
    this.load.atlas('flares', 'assets/particles/flares.png', 'assets/particles/flares.json');
    this.load.image('logo', 'assets/sprites/phaser2.png');
    this.load.image('space', 'assets/skies/space.jpg');
}

function create ()
{
    var textures = this.textures;

    this.add.image(400, 300, 'space');

    var logo = this.add.image(400, 300, 'logo');

    var origin = logo.getTopLeft();

    var logoSource = {
        getRandomPoint: function (vec)
        {
            do
            {
                var x = Phaser.Math.Between(0, logo.width - 1);
                var y = Phaser.Math.Between(0, logo.height - 1);
                var pixel = textures.getPixel(x, y, 'logo');
            } while (pixel.alpha < 255);

            return vec.setTo(x + origin.x, y + origin.y);
        }
    };

    var particles = this.add.particles('flares');

    particles.createEmitter({
        x: 0,
        y: 0,
        lifespan: 1000,
        gravityY: 10,
        scale: { start: 0, end: 0.25, ease: 'Quad.easeOut' },
        alpha: { start: 1, end: 0, ease: 'Quad.easeIn' },
        blendMode: 'ADD',
        emitZone: { type: 'random', source: logoSource }
    });
}
                        

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