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Example of Elixir and the bit-syntax to read a Bitmap image
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| defmodule Bumper do | |
| @doc ~S""" | |
| Reads a Bitmap (24-bit) and displays width, height, and the RGB of each pixel | |
| """ | |
| def show(filename) do | |
| {:ok, bindata} = File.read(filename) | |
| << "BM", | |
| _::size(64), | |
| offset_to_pixels::size(32)-little, | |
| _::size(32), | |
| width::size(32)-little, | |
| height::size(32)-little, | |
| _::size(16), | |
| 24::size(16)-little, | |
| _rest::binary>> = bindata | |
| <<_::size(offset_to_pixels)-bytes, pixels::binary>> = bindata | |
| IO.puts "Offset:#{offset_to_pixels} Width:#{width} Height:#{height}" | |
| for <<b::size(8), g::size(8), r::size(8) <- pixels >>, do: {r,g,b} | |
| end | |
| end | |
| Bumper.show("krgbw.bmp") | |
| |> IO.inspect |
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