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NIF based bindings for libvips
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lib/vix/g_object/g_param_spec.ex
defmodule Vix.GObject.GParamSpec do
@moduledoc false
@type t :: %{}
defstruct [:param_name, :desc, :spec_type, :value_type, :data, :priority, :flags, :type]
alias __MODULE__
def new(opt) do
pspec = %GParamSpec{
param_name: opt.name,
desc: opt.desc,
spec_type: to_string(opt.spec_type),
value_type: to_string(opt.value_type),
data: opt.data,
priority: opt.priority,
flags: opt.flags,
type: nil
}
%GParamSpec{pspec | type: type(pspec)}
end
def type(%GParamSpec{spec_type: "GParamEnum", value_type: value_type}) do
{:enum, value_type}
end
def type(%GParamSpec{spec_type: "GParamFlags", value_type: value_type}) do
{:flags, value_type}
end
# for array of enum, libvips does not pass required information to
# properly expose it to elixir world with correct spec and
# validation. libvips marks array of enum as array of int.
#
# To address this we try to recognize common type of enums
# explicitly and handle casting in elixir side.
def type(%GParamSpec{param_name: "mode", desc: "Array of VipsBlendMode " <> _}) do
{:vips_array, "Enum.VipsBlendMode"}
end
def type(%GParamSpec{value_type: "VipsArray" <> nested_type}) do
{:vips_array, nested_type}
end
def type(%GParamSpec{value_type: "VipsImage", flags: flags}) do
if :vips_argument_modify in flags do
"MutableVipsImage"
else
"VipsImage"
end
end
def type(%GParamSpec{value_type: value_type}) do
value_type
end
end