mapslice/lib/util/pow2roundup.js

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

'use strict'
module.exports = function pow2roundup (x) {
  if (x < 1) {
    return 1
  }
  --x
  x |= x >> 1
  x |= x >> 2
  x |= x >> 4
  x |= x >> 8
  x |= x >> 16
  return x + 1
}