Claudio Ortolina
52 lines
1.5 KiB
Elixir
52 lines
1.5 KiB
Elixir
defmodule MusicLibrary.Assets.Image do
|
|
@moduledoc """
|
|
Image processing via Vix (libvips) for covers and artist images.
|
|
"""
|
|
|
|
alias Vix.Vips.{Image, Operation}
|
|
|
|
fallback_path = Application.app_dir(:music_library, ["priv", "image-not-found.jpg"])
|
|
fallback_data = File.read!(fallback_path)
|
|
|
|
@external_resource fallback_path
|
|
|
|
@default_size 2000
|
|
@default_format "image/jpeg"
|
|
|
|
@spec fallback_data() :: binary()
|
|
def fallback_data, do: unquote(fallback_data)
|
|
|
|
@spec resize(binary(), pos_integer(), String.t()) :: {:ok, binary()} | {:error, term()}
|
|
def resize(cover_data, size \\ @default_size, format \\ @default_format) do
|
|
:telemetry.span(
|
|
[:music_library, :assets, :image, :resize],
|
|
%{},
|
|
fn ->
|
|
{:ok, thumb} = Operation.thumbnail_buffer(cover_data, size)
|
|
result = Image.write_to_buffer(thumb, extension(format))
|
|
{result, %{}}
|
|
end
|
|
)
|
|
end
|
|
|
|
@spec convert(binary(), String.t(), String.t()) :: {:ok, binary()}
|
|
def convert(cover_data, data_format, target_format) do
|
|
if data_format == target_format do
|
|
{:ok, cover_data}
|
|
else
|
|
:telemetry.span(
|
|
[:music_library, :assets, :image, :convert],
|
|
%{},
|
|
fn ->
|
|
{:ok, image} = Image.new_from_buffer(cover_data)
|
|
result = Image.write_to_buffer(image, extension(target_format))
|
|
{result, %{}}
|
|
end
|
|
)
|
|
end
|
|
end
|
|
|
|
defp extension("image/jpeg"), do: ".jpg"
|
|
defp extension("image/webp"), do: ".webp"
|
|
end
|