alias Vix.Vips.Image
alias Vix.Vips.Operation

input = "./test/images/puppies.jpg"
# input = "./pexels-tommes-frites-9283080.jpg"

{:ok, img} = Image.new_from_file(input)

max_height = 10_000

# change as required
# text width is half of input image width
scale = 0.5

{:ok, {text, _}} =
  Operation.text(
    ~S(<span foreground="#002299">www.mywebsite.com/user/foo</span>),
    width: round(Image.width(img) * scale),
    rgba: true,
    # have large max height to let libvips auto set it
    height: max_height
  )

pos_x = Image.width(img) / 2 - Image.width(text) / 2
pos_y = Image.height(img) / 2 - Image.height(text) / 2

{:ok, overlay} =
  Operation.composite2(img, text, :VIPS_BLEND_MODE_OVER, x: round(pos_x), y: round(pos_y))

:ok = Image.write_to_file(overlay, "out.jpg")

# :ok =
#   Operation.extract_area!(
#     overlay,
#     0,
#     round(Image.height(img) / 2),
#     Image.width(img),
#     round(Image.height(img) / 2) - 1
#   )
#   |> Image.write_to_file("out.jpg")