this is required so that devices that aren't using 1x or 2x (like the iPhone 6 Plus with a pixelRatio of 3x) still show icons, albeit bilinearly scaled to the correct size in the SpriteAtlas
this is required so that devices that aren't using 1x or 2x (like the iPhone 6 Plus with a pixelRatio of 3x) still show icons, albeit bilinearly scaled to the correct size in the SpriteAtlas