mirror of
https://github.com/python-pillow/Pillow.git
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308 lines
8.4 KiB
Python
308 lines
8.4 KiB
Python
import os
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import re
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from io import BytesIO
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import pytest
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from PIL import Image, ImageFile, Jpeg2KImagePlugin, UnidentifiedImageError, features
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from .helper import (
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assert_image_equal,
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assert_image_similar,
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assert_image_similar_tofile,
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is_big_endian,
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skip_unless_feature,
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)
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EXTRA_DIR = "Tests/images/jpeg2000"
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pytestmark = skip_unless_feature("jpg_2000")
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test_card = Image.open("Tests/images/test-card.png")
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test_card.load()
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# OpenJPEG 2.0.0 outputs this debugging message sometimes; we should
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# ignore it---it doesn't represent a test failure.
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# 'Not enough memory to handle tile data'
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def roundtrip(im, **options):
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out = BytesIO()
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im.save(out, "JPEG2000", **options)
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test_bytes = out.tell()
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out.seek(0)
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im = Image.open(out)
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im.bytes = test_bytes # for testing only
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im.load()
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return im
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def test_sanity():
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# Internal version number
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assert re.search(r"\d+\.\d+\.\d+$", features.version_codec("jpg_2000"))
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with Image.open("Tests/images/test-card-lossless.jp2") as im:
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px = im.load()
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assert px[0, 0] == (0, 0, 0)
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assert im.mode == "RGB"
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assert im.size == (640, 480)
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assert im.format == "JPEG2000"
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assert im.get_format_mimetype() == "image/jp2"
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def test_jpf():
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with Image.open("Tests/images/balloon.jpf") as im:
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assert im.format == "JPEG2000"
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assert im.get_format_mimetype() == "image/jpx"
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def test_invalid_file():
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invalid_file = "Tests/images/flower.jpg"
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with pytest.raises(SyntaxError):
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Jpeg2KImagePlugin.Jpeg2KImageFile(invalid_file)
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def test_bytesio():
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with open("Tests/images/test-card-lossless.jp2", "rb") as f:
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data = BytesIO(f.read())
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assert_image_similar_tofile(test_card, data, 1.0e-3)
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# These two test pre-written JPEG 2000 files that were not written with
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# PIL (they were made using Adobe Photoshop)
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def test_lossless(tmp_path):
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with Image.open("Tests/images/test-card-lossless.jp2") as im:
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im.load()
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outfile = str(tmp_path / "temp_test-card.png")
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im.save(outfile)
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assert_image_similar(im, test_card, 1.0e-3)
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def test_lossy_tiled():
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assert_image_similar_tofile(
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test_card, "Tests/images/test-card-lossy-tiled.jp2", 2.0
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)
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def test_lossless_rt():
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im = roundtrip(test_card)
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assert_image_equal(im, test_card)
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def test_lossy_rt():
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im = roundtrip(test_card, quality_layers=[20])
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assert_image_similar(im, test_card, 2.0)
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def test_tiled_rt():
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im = roundtrip(test_card, tile_size=(128, 128))
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assert_image_equal(im, test_card)
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def test_tiled_offset_rt():
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im = roundtrip(test_card, tile_size=(128, 128), tile_offset=(0, 0), offset=(32, 32))
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assert_image_equal(im, test_card)
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def test_tiled_offset_too_small():
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with pytest.raises(ValueError):
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roundtrip(test_card, tile_size=(128, 128), tile_offset=(0, 0), offset=(128, 32))
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def test_irreversible_rt():
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im = roundtrip(test_card, irreversible=True, quality_layers=[20])
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assert_image_similar(im, test_card, 2.0)
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def test_prog_qual_rt():
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im = roundtrip(test_card, quality_layers=[60, 40, 20], progression="LRCP")
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assert_image_similar(im, test_card, 2.0)
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def test_prog_res_rt():
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im = roundtrip(test_card, num_resolutions=8, progression="RLCP")
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assert_image_equal(im, test_card)
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def test_default_num_resolutions():
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for num_resolutions in range(2, 6):
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d = 1 << (num_resolutions - 1)
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im = test_card.resize((d - 1, d - 1))
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with pytest.raises(OSError):
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roundtrip(im, num_resolutions=num_resolutions)
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reloaded = roundtrip(im)
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assert_image_equal(im, reloaded)
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def test_reduce():
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with Image.open("Tests/images/test-card-lossless.jp2") as im:
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assert callable(im.reduce)
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im.reduce = 2
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assert im.reduce == 2
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im.load()
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assert im.size == (160, 120)
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im.thumbnail((40, 40))
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assert im.size == (40, 30)
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def test_load_dpi():
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with Image.open("Tests/images/test-card-lossless.jp2") as im:
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assert im.info["dpi"] == (71.9836, 71.9836)
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with Image.open("Tests/images/zero_dpi.jp2") as im:
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assert "dpi" not in im.info
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def test_header_errors():
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for path in (
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"Tests/images/invalid_header_length.jp2",
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"Tests/images/not_enough_data.jp2",
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):
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with pytest.raises(UnidentifiedImageError):
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with Image.open(path):
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pass
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with pytest.raises(OSError):
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with Image.open("Tests/images/expected_to_read.jp2"):
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pass
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def test_layers_type(tmp_path):
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outfile = str(tmp_path / "temp_layers.jp2")
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for quality_layers in [[100, 50, 10], (100, 50, 10), None]:
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test_card.save(outfile, quality_layers=quality_layers)
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for quality_layers in ["quality_layers", ("100", "50", "10")]:
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with pytest.raises(ValueError):
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test_card.save(outfile, quality_layers=quality_layers)
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def test_layers():
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out = BytesIO()
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test_card.save(out, "JPEG2000", quality_layers=[100, 50, 10], progression="LRCP")
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out.seek(0)
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with Image.open(out) as im:
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im.layers = 1
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im.load()
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assert_image_similar(im, test_card, 13)
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out.seek(0)
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with Image.open(out) as im:
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im.layers = 3
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im.load()
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assert_image_similar(im, test_card, 0.4)
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def test_rgba():
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# Arrange
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with Image.open("Tests/images/rgb_trns_ycbc.j2k") as j2k:
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with Image.open("Tests/images/rgb_trns_ycbc.jp2") as jp2:
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# Act
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j2k.load()
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jp2.load()
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# Assert
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assert j2k.mode == "RGBA"
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assert jp2.mode == "RGBA"
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def test_16bit_monochrome_has_correct_mode():
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with Image.open("Tests/images/16bit.cropped.j2k") as j2k:
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j2k.load()
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assert j2k.mode == "I;16"
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with Image.open("Tests/images/16bit.cropped.jp2") as jp2:
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jp2.load()
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assert jp2.mode == "I;16"
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@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
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def test_16bit_monochrome_jp2_like_tiff():
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with Image.open("Tests/images/16bit.cropped.tif") as tiff_16bit:
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assert_image_similar_tofile(tiff_16bit, "Tests/images/16bit.cropped.jp2", 1e-3)
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@pytest.mark.xfail(is_big_endian(), reason="Fails on big-endian")
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def test_16bit_monochrome_j2k_like_tiff():
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with Image.open("Tests/images/16bit.cropped.tif") as tiff_16bit:
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assert_image_similar_tofile(tiff_16bit, "Tests/images/16bit.cropped.j2k", 1e-3)
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def test_16bit_j2k_roundtrips():
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with Image.open("Tests/images/16bit.cropped.j2k") as j2k:
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im = roundtrip(j2k)
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assert_image_equal(im, j2k)
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def test_16bit_jp2_roundtrips():
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with Image.open("Tests/images/16bit.cropped.jp2") as jp2:
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im = roundtrip(jp2)
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assert_image_equal(im, jp2)
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def test_unbound_local():
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# prepatch, a malformed jp2 file could cause an UnboundLocalError exception.
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with pytest.raises(OSError):
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with Image.open("Tests/images/unbound_variable.jp2"):
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pass
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def test_parser_feed():
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# Arrange
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with open("Tests/images/test-card-lossless.jp2", "rb") as f:
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data = f.read()
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# Act
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p = ImageFile.Parser()
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p.feed(data)
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# Assert
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assert p.image.size == (640, 480)
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@pytest.mark.skipif(
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not os.path.exists(EXTRA_DIR), reason="Extra image files not installed"
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)
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@pytest.mark.parametrize("name", ("subsampling_1", "subsampling_2", "zoo1", "zoo2"))
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def test_subsampling_decode(name):
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test = f"{EXTRA_DIR}/{name}.jp2"
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reference = f"{EXTRA_DIR}/{name}.ppm"
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with Image.open(test) as im:
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epsilon = 3 # for YCbCr images
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with Image.open(reference) as im2:
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width, height = im2.size
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if name[-1] == "2":
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# RGB reference images are downscaled
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epsilon = 3e-3
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width, height = width * 2, height * 2
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expected = im2.resize((width, height), Image.NEAREST)
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assert_image_similar(im, expected, epsilon)
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@pytest.mark.parametrize(
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"test_file",
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[
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"Tests/images/crash-4fb027452e6988530aa5dabee76eecacb3b79f8a.j2k",
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"Tests/images/crash-7d4c83eb92150fb8f1653a697703ae06ae7c4998.j2k",
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"Tests/images/crash-ccca68ff40171fdae983d924e127a721cab2bd50.j2k",
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"Tests/images/crash-d2c93af851d3ab9a19e34503626368b2ecde9c03.j2k",
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],
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)
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def test_crashes(test_file):
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with open(test_file, "rb") as f:
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with Image.open(f) as im:
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# Valgrind should not complain here
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try:
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im.load()
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except OSError:
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pass
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