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# This file is part of beets.
# Copyright 2020, David Swarbrick.
#
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
"""Tests for image resizing based on filesize."""
import os
import unittest
from pathlib import Path
from unittest.mock import patch
from beets.test import _common
from beets.test.helper import BeetsTestCase, CleanupModulesMixin
from beets.util import command_output, syspath
from beets.util.artresizer import IMBackend, PILBackend
class DummyIMBackend(IMBackend):
"""An `IMBackend` which pretends that ImageMagick is available.
The version is sufficiently recent to support image comparison.
"""
def __init__(self):
"""Init a dummy backend class for mocked ImageMagick tests."""
self.version = (7, 0, 0)
self.legacy = False
self.convert_cmd = ["magick"]
self.identify_cmd = ["magick", "identify"]
self.compare_cmd = ["magick", "compare"]
class DummyPILBackend(PILBackend):
"""An `PILBackend` which pretends that PIL is available."""
def __init__(self):
"""Init a dummy backend class for mocked PIL tests."""
pass
class ArtResizerFileSizeTest(CleanupModulesMixin, BeetsTestCase):
"""Unittest test case for Art Resizer to a specific filesize."""
modules = (IMBackend.__module__,)
IMG_225x225 = os.path.join(_common.RSRC, b"abbey.jpg")
IMG_225x225_SIZE = os.stat(syspath(IMG_225x225)).st_size
def _test_img_resize(self, backend):
"""Test resizing based on file size, given a resize_func."""
# Check quality setting unaffected by new parameter
im_95_qual = backend.resize(
225,
self.IMG_225x225,
quality=95,
max_filesize=0,
)
# check valid path returned - max_filesize hasn't broken resize command
assert Path(os.fsdecode(im_95_qual)).exists()
# Attempt a lower filesize with same quality
im_a = backend.resize(
225,
self.IMG_225x225,
quality=95,
max_filesize=0.9 * os.stat(syspath(im_95_qual)).st_size,
)
assert Path(os.fsdecode(im_a)).exists()
# target size was achieved
assert (
os.stat(syspath(im_a)).st_size
< os.stat(syspath(im_95_qual)).st_size
)
# Attempt with lower initial quality
im_75_qual = backend.resize(
225,
self.IMG_225x225,
quality=75,
max_filesize=0,
)
assert Path(os.fsdecode(im_75_qual)).exists()
im_b = backend.resize(
225,
self.IMG_225x225,
quality=95,
max_filesize=0.9 * os.stat(syspath(im_75_qual)).st_size,
)
assert Path(os.fsdecode(im_b)).exists()
# Check high (initial) quality still gives a smaller filesize
assert (
os.stat(syspath(im_b)).st_size
< os.stat(syspath(im_75_qual)).st_size
)
@unittest.skipUnless(PILBackend.available(), "PIL not available")
def test_pil_file_resize(self):
"""Test PIL resize function is lowering file size."""
self._test_img_resize(PILBackend())
@unittest.skipUnless(IMBackend.available(), "ImageMagick not available")
def test_im_file_resize(self):
"""Test IM resize function is lowering file size."""
self._test_img_resize(IMBackend())
@unittest.skipUnless(PILBackend.available(), "PIL not available")
def test_pil_file_deinterlace(self):
"""Test PIL deinterlace function.
Check if the `PILBackend.deinterlace()` function returns images
that are non-progressive
"""
path = PILBackend().deinterlace(self.IMG_225x225)
from PIL import Image
with Image.open(path) as img:
assert "progression" not in img.info
@unittest.skipUnless(IMBackend.available(), "ImageMagick not available")
def test_im_file_deinterlace(self):
"""Test ImageMagick deinterlace function.
Check if the `IMBackend.deinterlace()` function returns images
that are non-progressive.
"""
im = IMBackend()
path = im.deinterlace(self.IMG_225x225)
cmd = [
*im.identify_cmd,
"-format",
"%[interlace]",
syspath(path, prefix=False),
]
out = command_output(cmd).stdout
assert out == b"None"
@patch("beets.util.artresizer.util")
def test_write_metadata_im(self, mock_util):
"""Test writing image metadata."""
metadata = {"a": "A", "b": "B"}
im = DummyIMBackend()
im.write_metadata("foo", metadata)
command = [*im.convert_cmd, *"foo -set a A -set b B foo".split()]
mock_util.command_output.assert_called_once_with(command)
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