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An approachable image processing library primarily based upon Vix and libvips that is NIF-based, fast, multi-threaded, pipelined and has a low memory footprint.

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image lib image enum combine_mode.ex
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lib/image/enum/combine_mode.ex 

defmodule Image.CombineMode do

  @type t :: :VIPS_COMBINE_MODE_SET | :VIPS_COMBINE_MODE_ADD | :VIPS_COMBINE_MODE_LAST



  def validate(mode) when mode in [:VIPS_COMBINE_MODE_SET, :VIPS_COMBINE_MODE_ADD, :VIPS_COMBINE_MODE_LAST] do

    {:ok, mode}

  end



  def validate(:set), do: {:ok, VIPS_COMBINE_MODE_SET}

  def validate(:add), do: {:ok, VIPS_COMBINE_MODE_ADD}

  def validate(:last), do: {:ok, VIPS_COMBINE_MODE_LAST}



  def validate(other) do

    {:error, "Invalid combine mode #{inspect other}. The valid modes are :set, :add or :last"}

  end

end