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image
0.13.1
0.72.0
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0.1.0
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/new.ex
defmodule Image.Options.New do
@moduledoc """
Options for new images.
"""
alias Image.{Color, BandFormat, Interpretation}
@type t :: [
{:bands, pos_integer()} |
{:format, Image.BandFormat.t()} |
{:interpretation, Image.Interpretation.t()} |
{:color, float() | Image.pixel()} |
{:x_res, number()} |
{:y_res, number()} |
{:x_offset, number()} |
{:y_offset, number()}
]
def default_options do
[
bands: 3,
format: {:u, 8},
interpretation: :srgb,
color: 0,
x_res: 0,
y_res: 0,
x_offset: 0,
y_offset: 0
]
end
@doc """
Validate the options for `Image.new/2`.
"""
def validate_options(options) do
options =
Keyword.merge(default_options(), options)
options =
case Enum.reduce_while(options, options, &validate_option(&1, &2)) do
{:error, value} ->
{:error, value}
options ->
{:ok, options}
end
case options do
{:ok, options} ->
options
|> Map.new()
|> wrap(:ok)
other -> other
end
end
defp validate_option({:format, format}, options) when is_tuple(format) do
case BandFormat.image_format_from_nx(format) do
{:ok, format} ->
{:cont, Keyword.put(options, :format, format)}
{:error, reason} ->
{:halt, {:error, reason}}
end
end
defp validate_option({:format, format}, options) when is_atom(format) do
case BandFormat.nx_format(format) do
{:ok, _nx_type} ->
{:cont, options}
{:error, reason} ->
{:halt, {:error, reason}}
end
end
defp validate_option({:interpretation, interpretation}, options) do
case Interpretation.validate_interpretation(interpretation) do
{:ok, interpretation} ->
{:cont, Keyword.put(options, :interpretation, interpretation)}
{:error, reason} ->
{:halt, {:error, reason}}
end
end
@numeric_options [:x_res, :y_res, :x_offset, :y_offset, :bands]
defp validate_option({option, value}, options)
when option in @numeric_options and is_number(value) and value >= 0 do
{:cont, options}
end
defp validate_option({:color, color}, options) do
case Color.rgb_color(color) do
{:ok, color} ->
rgb = if Keyword.keyword?(color), do: Keyword.fetch!(color, :rgb), else: color
{:cont, Keyword.put(options, :color, rgb)}
{:error, reason} ->
{:halt, {:error, reason}}
end
end
defp validate_option({option, value}, _options) do
{:halt, {:error, invalid_option(option, value)}}
end
@doc false
def invalid_option(option) do
"Invalid option or option value: #{inspect(option)}"
end
@doc false
def invalid_option(option, value) do
"Invalid option or option value: #{option}: #{inspect value}"
end
defp wrap(term, atom) do
{atom, term}
end
end