Load Pixels. Using p5.js library.
function setup () {
createCanvas(1152, 648);
background(0);
}
function draw () {
loadPixels();
var d = pixelDensity();
var t = 4 * (width * d) * (height * d);
for (var i = 0; i < t; i += 4) {
pixels[i + 0] = random(85, 255); // red
pixels[i + 1] = 0; // green
pixels[i + 2] = 0; // blue
pixels[i + 3] = 255; // alpha
}
updatePixels();
}