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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/radial_gradient.ex
defmodule Image.Options.RadialGradient do
@moduledoc """
Options and option validation for `Image.radial_gradient/3`.
"""
alias Image.Color
@typedoc """
Options applicable to `Image.radial_gradient/3`.
"""
@type radial_gradient_option ::
{:start_color, Color.rgb_color()}
| {:finish_color, Color.rgb_color()}
| {:feather, pos_integer()}
| {:radius, number()}
@typedoc """
Options list or map for `Image.radial_gradient/3`.
"""
@type radial_gradient_options :: [radial_gradient_option()] | map()
@default_start_color [0.0, 0.0, 0.0, 0.0]
@default_finish_color [0.0, 0.0, 0.0, 255.0]
@default_feather 1
@default_radius 2
@doc """
Validate the options for `Image.radial_gradient/3`.
"""
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({key, color} = option, options)
when key in [:start_color, :finish_color] do
case Color.rgb_color(color) do
{:ok, hex: _hex, rgb: color} -> {:cont, Keyword.put(options, key, color)}
{:ok, color} -> {:cont, Keyword.put(options, key, color)}
_other -> {:halt, invalid_option(option)}
end
end
defp validate_option({:radius, angle}, options) when is_number(angle) do
{:cont, options}
end
defp validate_option({:feather, feather}, options) when feather in 1..10 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
[
start_color: @default_start_color,
finish_color: @default_finish_color,
feather: @default_feather,
radius: @default_radius
]
end
end