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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/histogram.ex
defmodule Image.Options.Histogram do
@moduledoc """
Options and option validation for `Image.Histogram.as_svg/2`.
"""
@typedoc """
Options applicable to `Image.Histogram.as_svg/2`.
"""
@type histogram_option ::
{:width, pos_integer() | :auto}
| {:height, pos_integer() | :auto}
@typedoc """
Options list or map for `Image.Histogram.as_svg/2`.
"""
@type histogram_options :: [histogram_option()] | map()
@doc """
Validate the options for `Image.Histogram.as_svg/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({:width, width}, options)
when is_integer(width) and width > 0 do
options = Keyword.put(options, :width, "#{width}px")
{:cont, options}
end
defp validate_option({:height, height}, options)
when is_integer(height) and height > 0 do
options = Keyword.put(options, :height, "#{height}px")
{:cont, options}
end
defp validate_option({:width, :auto}, options) do
options = Keyword.put(options, :width, "auto")
{:cont, options}
end
defp validate_option({:height, :auto}, options) do
options = Keyword.put(options, :height, "auto")
{: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
[
width: :auto,
height: :auto
]
end
end