bryanhunter · January 20, 2015 21:18 · Jan 20, 2015
diff --git a/bumper.exs b/bumper.exs
@@ -0,0 +1,26 @@
+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