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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/trim.ex
defmodule Image.Options.Trim do
@moduledoc """
Options and option validation for `Image.trim/2`.
"""
alias Image.Color
@typedoc """
Options applicable to Image.trim/2
"""
@type trim_options :: [
{:background, Color.t() | :auto}
| {:threshold, non_neg_integer()}
]
@doc """
Validate the options for `Image.trim/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
def validate_options(%{} = options) do
{:ok, options}
end
defp validate_option({:background, :auto}, options) do
{:cont, options}
end
defp validate_option({:background, color} = option, options) do
case Color.rgb_color(color) do
{:ok, hex: _hex, rgb: color} -> {:cont, Keyword.put(options, :background, color)}
{:ok, color} -> {:cont, Keyword.put(options, :backgrouond, color)}
_other -> {:halt, invalid_option(option)}
end
end
defp validate_option({:threshold, threshold}, options)
when is_integer(threshold) and threshold > 0 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
[
background: :auto,
threshold: 10
]
end
end