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vix

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NIF based bindings for libvips

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vix lib script.exs
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lib/script.exs 

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")