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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/options/equalize.ex
defmodule Image.Options.Equalize do
@moduledoc """
Options and option validation for `Image.equalize/2`.
"""
@typedoc """
Options applicable to `Image.equalize/2`.
"""
@type equalize_option :: :all | :each | :luminance
@bands [:all, :each, :luminance]
@default_band :all
@doc """
Validate the options for `Image.equalize/2`.
"""
def validate_options(options) when is_list(options) do
options = Keyword.merge(default_options(), options)
case Enum.reduce_while(options, options, &validate_option(&1, &2)) do
{:error, value} ->
{:error, value}
options ->
{:ok, Map.new(options)}
end
end
defp validate_option({:bands, bands}, options) when bands in @bands do
{:cont, options}
end
defp validate_option(option, _options) do
{:halt, {:error, invalid_option(option)}}
end
defp invalid_option(option) do
"Invalid option or option value: #{inspect(option)}"
end
defp default_options do
[
bands: @default_band
]
end
end