Device scaling factorr, pixi / phaser..

phaser_resolution.js

var configuration = {
    'render' : Phaser.CANVAS,   // Render type
    'canvas_width_max' : 2048,  // The maximum width of the canvas
    'canvas_width' : 1000,      // The width of the canvas
    'canvas_height_max' : 2048, // The maximum height of the canvas
    'canvas_height' : 650,      // The height of the canvas
    'scale_ratio' : 1,          // Scaling factor
    'aspect_ratio' : 1,         // Aspect ratio
};

// Calculate the scaling factor and the aspect ratio
configuration.canvas_width = window.screen.availWidth * window.devicePixelRatio;
configuration.canvas_height = window.screen.availHeight * window.devicePixelRatio;
configuration.aspect_ratio = configuration.canvas_width / configuration.canvas_height;
if (configuration.aspect_ratio < 1) configuration.scale_ratio = configuration.canvas_height / configuration.canvas_height_max;
else configuration.scale_ratio = configuration.canvas_width / configuration.canvas_width_max;

game = new Phaser.Game(configuration.canvas_width, configuration.canvas_height, configuration.render, 'gamewindow', { preload: preload, create: create, update: update, render: render });

player = game.add.sprite(game.world.centerX, game.world.centerY, 'player');
player.scale.set(configuration.scale_ratio);