/
thumbnail.ex
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thumbnail.ex
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defmodule Image.Options.Thumbnail do
@moduledoc """
Options and option validation for `Image.thumbnail/3`.
"""
alias Image.Options.Crop
alias Image.Color
import Color, only: [is_inbuilt_profile: 1]
import Image, only: [is_size: 1]
@typedoc """
Options applicable to Image.thumbnail/3
"""
@type thumbnail_options :: [
{:autorotate, boolean()}
| {:intent, Image.render_intent()}
| {:export_icc_profile, Color.icc_profile()}
| {:import_icc_profile, Color.icc_profile()}
| {:linear, boolean()}
| {:resize, resize_dimension()}
| {:height, pos_integer()}
| {:crop, Crop.crop_focus()}
| {:fit, :fill | :contain | :cover}
]
@type resize_dimension :: :width | :height | :both
@intent_map %{
perceptual: :VIPS_INTENT_PERCEPTUAL,
relative: :VIPS_INTENT_RELATIVE,
saturation: :VIPS_INTENT_SATURATION,
absolute: :VIPS_INTENT_ABSOLUTE
}
@intent Map.keys(@intent_map)
@resize_map %{
up: :VIPS_SIZE_UP,
down: :VIPS_SIZE_DOWN,
both: :VIPS_SIZE_BOTH,
force: :VIPS_SIZE_FORCE
}
@resize Map.keys(@resize_map)
@doc """
Validate the options for `Image.resize/2`.
See `t:Image.Options.Resize.resize_options/0`.
"""
def validate_options(options) do
case Enum.reduce_while(options, options, &validate_option(&1, &2)) do
{:error, value} ->
{:error, value}
options ->
{:ok, options}
end
end
defp validate_option({:autorotate, autorotate}, options) when is_boolean(autorotate) do
options =
options
|> Keyword.delete(:autorotate)
|> Keyword.put(:"auto-rotate", autorotate)
{:cont, options}
end
defp validate_option({:resize, resize}, options) when resize in @resize do
resize = Map.fetch!(@resize_map, resize)
options =
options
|> Keyword.delete(:resize)
|> Keyword.put(:size, resize)
{:cont, options}
end
defp validate_option({:crop, crop}, options) do
Crop.validate_crop(crop, options)
end
defp validate_option({:linear, linear}, options) when is_boolean(linear) do
{:cont, options}
end
defp validate_option({:height, height}, options) when is_integer(height) and height > 0 do
{:cont, options}
end
defp validate_option({:intent, intent}, options) when intent in @intent do
intent = Map.fetch!(@intent_map, intent)
{:cont, Keyword.put(options, :intent, intent)}
end
defp validate_option({:import_icc_profile, profile}, options)
when is_inbuilt_profile(profile) or is_binary(profile) do
options =
options
|> Keyword.delete(:import_icc_profile)
|> Keyword.put(:"import-profile", to_string(profile))
if Image.Color.known_icc_profile?(profile) do
{:cont, options}
else
{:halt, {:error, "The color profile #{inspect(profile)} is not known"}}
end
end
defp validate_option({:export_icc_profile, profile}, options)
when is_inbuilt_profile(profile) or is_binary(profile) do
options =
options
|> Keyword.delete(:export_icc_profile)
|> Keyword.put(:"export-profile", to_string(profile))
if Image.Color.known_icc_profile?(profile) do
{:cont, options}
else
{:halt, {:error, "The color profile #{inspect(profile)} is not known"}}
end
end
defp validate_option({:fit, :fill}, options) do
options =
options
|> Keyword.put(:size, :VIPS_SIZE_FORCE)
|> Keyword.delete(:fit)
{:cont, options}
end
defp validate_option({:fit, :contain}, options) do
options =
options
|> Keyword.put(:crop, :VIPS_INTERESTING_NONE)
|> Keyword.put(:size, :VIPS_SIZE_BOTH)
{:cont, options}
end
defp validate_option({:fit, :cover}, options) do
current_crop = Keyword.get(options, :crop, :VIPS_INTERESTING_NONE)
crop =
if current_crop == :VIPS_INTERESTING_NONE, do: :VIPS_INTERESTING_CENTRE, else: current_crop
options =
options
|> Keyword.put(:crop, crop)
|> Keyword.put(:size, :VIPS_SIZE_BOTH)
|> Keyword.delete(:fit)
{:cont, options}
end
defp validate_option(option, _options) do
{:halt, {:error, invalid_option(option)}}
end
defp invalid_option(option) do
"Invalid Image.thumbnail option or option value: #{inspect(option)}"
end
@doc false
def validate_dimensions(dimensions, options) do
case dimensions(String.split(dimensions, ["x"])) do
width when is_size(width) ->
{:ok, width, options}
{width, height} when is_size(width) and is_size(height) ->
{:ok, width, Keyword.put(options, :height, height)}
_other ->
{:error, "Invalid dimensions. Found #{inspect(dimensions)}"}
end
end
defp dimensions([width]) do
case Integer.parse(width) do
{integer, ""} -> integer
_other -> width
end
end
defp dimensions([width, ""]) do
dimensions([width])
end
defp dimensions([width, height]) do
width = dimensions([width])
height = dimensions([height])
{width, height}
end
end