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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/vibrance.ex
defmodule Image.Options.Vibrance do
@moduledoc """
Options and option validation for `Image.vibrance/2`.
"""
@typedoc """
Options applicable to Image.vibrance/3
"""
@type vibrance_option :: {:threshold, pos_integer()}
@typedoc """
Options list for Image.vibrance/3
"""
@type vibrance_options :: [vibrance_option()] | map()
@default_vibrance_threshold 60
@doc false
def default_vibrance_threshold do
@default_vibrance_threshold
end
@doc """
Validate the options for `Image.vibrance/3`.
See `t:Image.Options.Vibrance.vibrance_options/0`.
"""
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
def validate_options(%{} = options) do
{:ok, options}
end
defp validate_option({:threshold, threshold}, options)
when is_integer(threshold) and threshold in 1..100//1 do
{:cont, options}
end
defp validate_option(option, _options) do
{:halt, {:error, invalid_option(option)}}
end
defp invalid_option(option) do
%Image.Error{
reason: :invalid_option,
value: option,
message: "Invalid option or option value: #{inspect(option)}"
}
end
defp default_options do
[
threshold: @default_vibrance_threshold
]
end
end