Note to self

pretty_canvas_devicePixelRatio.js

var cnv = $('canvas')[0];
var ctx = cnv.getContext('2d');

var ratio = window.devicePixelRatio

if (ratio) {
    ratio *= 1.5;
    var w = $(cnv).attr('width');
    var h = $(cnv).attr('height');

    $(cnv).attr('width', w * ratio);
    $(cnv).attr('height', h * ratio);
    $(cnv).css('width', w);
    $(cnv).css('height', h);
    ctx.scale(ratio, ratio);
}

ctx.font = "25px Open Sans";
ctx.fillText("Send Nudes", 10, 20);