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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/blurhash.ex
defmodule Image.Options.Blurhash do
@moduledoc """
Options and option validation for `Image.Blurhash.encode/2`.
"""
@typedoc """
Options applicable to `Image.Blurhash.encode/2`
"""
@type blurhash_option ::
{:x_components, pos_integer()}
| {:y_components, pos_integer()}
@typedoc """
Options list for Image.Blurhash.encode/2
"""
@type blurhash_options :: [blurhash_option()] | map()
@default_x_components 4
@default_y_components 3
@doc """
Validate the options for `Image.Blurhash.encode/2`.
See `t:Image.Options.Blurhash.blurhash_options/0`.
"""
def validate_options(image, options) when is_list(options) do
options = Keyword.merge(default_options(), options)
with :ok <- validate_image_bands(Image.bands(image)) do
case Enum.reduce_while(options, options, &validate_option(&1, &2)) do
{:error, message} ->
{:error, message}
options ->
{:ok, Map.new(options)}
end
end
end
defp validate_image_bands(3), do: :ok
defp validate_image_bands(n), do: {:error, "Image must have 3 bands. Found #{inspect n} bands in the image"}
defp validate_option({:x_components, x_components}, options) when x_components in 1..9 do
{:cont, options}
end
defp validate_option({:y_components, y_components}, options) when y_components in 1..9 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
[
x_components: @default_x_components,
y_components: @default_y_components
]
end
end