Дневна доза нонсенс…

function getLiveNeighbours(id, data) {
  var x = id % canvas.width;
  var y = parseInt(id / canvas.width);

  var cnt = 0;
  for (var i = -1; i < 2; i++) {
    for (var j = -1; j < 2; j++) {
      if ((i != 0 || j != 0) &&
        !(x+i < 0 || x+i >= canvas.width || y+j < 0 || y+j >= canvas.height) &&
        data.data[4*((y+j)*canvas.width+(x+i))] != THE_BLACK) {
        cnt++;
      }
    }
  }
  return cnt;
}

// (4)
var width = canvas.width*4;
var d = data.data;
var nd = newdata.data;
var cw = canvas.width;
var ch = canvas.height;
var base = 0;

for (var i = 0; i < d.length/4; i++) {
  var x = i % cw;
  var y = parseInt(i / cw);

  var cnt = 0;
  // (1), (2), (3)
  if (x > 0 && d[base-4] != THE_BLACK) cnt++;
  if (x < cw-1 && d[base+4] != THE_BLACK) cnt++;
  if (x > 0 && y > 0 && d[base-4-width] != THE_BLACK) cnt++;
  if (y > 0 && d[base-width] != THE_BLACK) cnt++;
  if (x < cw-1 && y > 0 && d[base+4-width] != THE_BLACK) cnt++;
  if (x > 0 && y < ch-1 && d[base-4+width] != THE_BLACK) cnt++;
  if (y < ch-1 && d[base+width] != THE_BLACK) cnt++;
  if (x < cw-1 && y < ch-1 && d[base+4+width] != THE_BLACK) cnt++;
  ...

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