class Worker
	actor

	fun get_byte(x, y: Int): Int do
		var res = 0
		for i in [0..8[.step(2) do
			var zr1 = crb[x + i]
			var zi1 = cib[y]

			var zr2 = crb [x + i + 1]
			var zi2 = cib[y]

			var b = 0
			for j in [0..nb_rounds[ do
				var nzr1 = zr1 * zr1 - zi1 * zi1 + crb[x+i]
				var nzi1 = zr1 * zi1 + zr1 * zi1 + cib[y]
				zr1 = nzr1
				zi1 = nzi1

				var nzr2 = zr2 * zr2 - zi2 * zi2 + crb[x + i + 1]
				var nzi2 = zr2 * zi2 + zr2 * zi2 + cib[y]
				zr2 = nzr2
				zi2 = nzi2

				if zr1 * zr1 + zi1 * zi1 > 4.0 then b = b | 2
				if zr2 * zr2 + zi2 * zi2 > 4.0 then b = b | 1
				if b == 3 then break
			end
			res = (res << 2) + b
		end
		return res ^-1
	end

	fun put_line(y: Int, line: Array[Int]) do
		for i in [0..line.length[ do line[i] = get_byte(i * 8, y)
	end

	fun work do
		var line = 0
		loop
			line = atomic.get_and_increment
			if line < n then put_line(line, data[line]) else break
		end
	end
end