readme.md

A comparison of how much code it takes to write random pixel data to the screen via canvas, or via x11. there is a similar protocol to x11 on mac. I don't know how windows or mobile works. I think this is enough to confirm that it wouldn't be too hard to provide the same low level access on any platform.

index.html

<canvas width=800 height=600></canvas>

<script>
var id
var mem = new Uint8ClampedArray(1024*1024 * 4)

function resize () {
  canvas.width = window.innerWidth
  canvas.height = window.innerHeight
  id = new ImageData(mem.slice(0, canvas.width*canvas.height*4), canvas.width, canvas.height)
}

var canvas = document.querySelector("canvas")
var ctx = canvas.getContext('2d')

document.body.style = 'margin:0px'
id = ctx.getImageData(0, 0, canvas.width, canvas.height)

resize()


function initial () {
  var data = id.data
  var len = data.length
  for(var i = 0; i < len; i++)
    data[i] = ~~(Math.random()*256)
}
initial()
window.requestAnimationFrame(function noise () {
  if(canvas.width !== window.innerWidth || canvas.height !== window.innerHeight) {
    resize()
    initial()
  }
  var data = id.data
  var len = data.length
  for(var i = 0; i < len; i++)
    data[i] = (data[i] +  ~~(Math.random()*32) - 15) % 256

  ctx.putImageData(id, 0, 0)
  window.requestAnimationFrame(noise)

}, 100)
</script>

x11.js

var x11 = require('x11');

var Exposure = x11.eventMask.Exposure;

x11.createClient(function(err, display)
{
  var X = display.client;
  X.require('render', function(err, Render) {
    var root = display.screen[0].root;
    main(root, X, Render);
  });
});


var w = 800, h = 600
var logo = {
  width: w, height: h, data: Buffer.alloc(w*h*4)
}

function main(root, X, Render) {

  var win, picWin, pic, gc;

  win = X.AllocID();
  X.CreateWindow(
     win, root,
     0, 0, logo.width, logo.height,
     0, 0, 0, 0,
     { eventMask: Exposure }
  );
  X.MapWindow(win);

  gc = X.AllocID();
  X.CreateGC(gc, win);

  var logoPixmap = X.AllocID();
  X.CreatePixmap(logoPixmap, win, 24, logo.width, logo.height);
  // TODO: add proper png pixel conversion here

  var winPicture
  var logoPicture
  var ts = Date.now()

    X.PutImage(2, logoPixmap, gc, logo.width, logo.height, 0, 0, 0, 24, logo.data);

    logoPicture = X.AllocID();
    Render.CreatePicture(logoPicture, logoPixmap, Render.rgb24);
    winPicture = X.AllocID();
    Render.CreatePicture(winPicture, win, Render.rgb24);


  function animate () {
    //not sure why fps is so low. we are sending quite a bit of data to the screen each time
    //but probably just havn't found the best way to do it.
    console.error('fps', 1000 / (Date.now() - ts))
    ts = Date.now()
    for(var i = 0; i < logo.data.length; i++)
      logo.data[i] = ~~(Math.random()*256)
    var start = Date.now()
    X.PutImage(2, logoPixmap, gc, logo.width, logo.height, 0, 0, 0, 24, logo.data);
    var start = Date.now()
    Render.Composite(3, logoPicture, 0, winPicture, 0, 0, 0, 0, 0, 0, logo.width, logo.height);
    setTimeout(animate, 10)
  }

  animate()

  X.on('event', function(ev) {
    if (ev.name == 'Expose')
      Render.Composite(3, logoPicture, 0, winPicture, 0, 0, 0, 0, 0, 0, logo.width, logo.height);
  });
}

Low-level pixel access is possible everywhere, but ease and complexity vary. Browser canvas is far simpler; native APIs like X11 give more control but require more code.
Deltarune

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