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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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lib/image/enum/combine_mode.ex
defmodule Image.CombineMode do
@moduledoc """
Functions to define and validate the combine
modes that can be applied when composing images.
"""
@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