mapslice/lib/util/getPowerTwo.js

Slices a given image into tiles to be used for a interactive map display. (including command-line tool)

'use strict'
module.exports = function getPowerTwo (x) {
  let power = 0
  let value = 0
  while (x > value) {
    power++
    if (value === 0) {
      value = 1
    } else {
      value = value << 1
    }
  }
  return power - 1
}