8x32 Map

function (pixelCount) {
  width = 8
  var map = []
  for (i = 0; i < pixelCount; i++) {
    y = Math.floor(i / width)
    x = i % width
    x = y % 2 == 1 ? width - 1 - x : x //zigzag
    map.push([x, y])
  }
  return map
}