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test_file_webp.py
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test_file_webp.py
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import io
import re
import sys
import warnings
import pytest
from PIL import Image, WebPImagePlugin, features
from .helper import (
assert_image_similar,
assert_image_similar_tofile,
hopper,
skip_unless_feature,
)
try:
from PIL import _webp
HAVE_WEBP = True
except ImportError:
HAVE_WEBP = False
class TestUnsupportedWebp:
def test_unsupported(self):
if HAVE_WEBP:
WebPImagePlugin.SUPPORTED = False
file_path = "Tests/images/hopper.webp"
pytest.warns(UserWarning, lambda: pytest.raises(OSError, Image.open, file_path))
if HAVE_WEBP:
WebPImagePlugin.SUPPORTED = True
@skip_unless_feature("webp")
class TestFileWebp:
def setup_method(self):
self.rgb_mode = "RGB"
def test_version(self):
_webp.WebPDecoderVersion()
_webp.WebPDecoderBuggyAlpha()
assert re.search(r"\d+\.\d+\.\d+$", features.version_module("webp"))
def test_read_rgb(self):
"""
Can we read a RGB mode WebP file without error?
Does it have the bits we expect?
"""
with Image.open("Tests/images/hopper.webp") as image:
assert image.mode == self.rgb_mode
assert image.size == (128, 128)
assert image.format == "WEBP"
image.load()
image.getdata()
# generated with:
# dwebp -ppm ../../Tests/images/hopper.webp -o hopper_webp_bits.ppm
assert_image_similar_tofile(image, "Tests/images/hopper_webp_bits.ppm", 1.0)
def _roundtrip(self, tmp_path, mode, epsilon, args={}):
temp_file = str(tmp_path / "temp.webp")
hopper(mode).save(temp_file, **args)
with Image.open(temp_file) as image:
assert image.mode == self.rgb_mode
assert image.size == (128, 128)
assert image.format == "WEBP"
image.load()
image.getdata()
if mode == self.rgb_mode:
# generated with: dwebp -ppm temp.webp -o hopper_webp_write.ppm
assert_image_similar_tofile(
image, "Tests/images/hopper_webp_write.ppm", 12.0
)
# This test asserts that the images are similar. If the average pixel
# difference between the two images is less than the epsilon value,
# then we're going to accept that it's a reasonable lossy version of
# the image.
target = hopper(mode)
if mode != self.rgb_mode:
target = target.convert(self.rgb_mode)
assert_image_similar(image, target, epsilon)
def test_write_rgb(self, tmp_path):
"""
Can we write a RGB mode file to webp without error?
Does it have the bits we expect?
"""
self._roundtrip(tmp_path, self.rgb_mode, 12.5)
def test_write_method(self, tmp_path):
self._roundtrip(tmp_path, self.rgb_mode, 12.0, {"method": 6})
buffer_no_args = io.BytesIO()
hopper().save(buffer_no_args, format="WEBP")
buffer_method = io.BytesIO()
hopper().save(buffer_method, format="WEBP", method=6)
assert buffer_no_args.getbuffer() != buffer_method.getbuffer()
def test_icc_profile(self, tmp_path):
self._roundtrip(tmp_path, self.rgb_mode, 12.5, {"icc_profile": None})
if _webp.HAVE_WEBPANIM:
self._roundtrip(
tmp_path, self.rgb_mode, 12.5, {"icc_profile": None, "save_all": True}
)
def test_write_unsupported_mode_L(self, tmp_path):
"""
Saving a black-and-white file to WebP format should work, and be
similar to the original file.
"""
self._roundtrip(tmp_path, "L", 10.0)
def test_write_unsupported_mode_P(self, tmp_path):
"""
Saving a palette-based file to WebP format should work, and be
similar to the original file.
"""
self._roundtrip(tmp_path, "P", 50.0)
@pytest.mark.skipif(sys.maxsize <= 2**32, reason="Requires 64-bit system")
def test_write_encoding_error_message(self, tmp_path):
temp_file = str(tmp_path / "temp.webp")
im = Image.new("RGB", (15000, 15000))
with pytest.raises(ValueError) as e:
im.save(temp_file, method=0)
assert str(e.value) == "encoding error 6"
def test_WebPEncode_with_invalid_args(self):
"""
Calling encoder functions with no arguments should result in an error.
"""
if _webp.HAVE_WEBPANIM:
with pytest.raises(TypeError):
_webp.WebPAnimEncoder()
with pytest.raises(TypeError):
_webp.WebPEncode()
def test_WebPDecode_with_invalid_args(self):
"""
Calling decoder functions with no arguments should result in an error.
"""
if _webp.HAVE_WEBPANIM:
with pytest.raises(TypeError):
_webp.WebPAnimDecoder()
with pytest.raises(TypeError):
_webp.WebPDecode()
def test_no_resource_warning(self, tmp_path):
file_path = "Tests/images/hopper.webp"
with Image.open(file_path) as image:
temp_file = str(tmp_path / "temp.webp")
with warnings.catch_warnings():
image.save(temp_file)
def test_file_pointer_could_be_reused(self):
file_path = "Tests/images/hopper.webp"
with open(file_path, "rb") as blob:
Image.open(blob).load()
Image.open(blob).load()
@skip_unless_feature("webp")
@skip_unless_feature("webp_anim")
def test_background_from_gif(self, tmp_path):
with Image.open("Tests/images/chi.gif") as im:
original_value = im.convert("RGB").getpixel((1, 1))
# Save as WEBP
out_webp = str(tmp_path / "temp.webp")
im.save(out_webp, save_all=True)
# Save as GIF
out_gif = str(tmp_path / "temp.gif")
with Image.open(out_webp) as im:
im.save(out_gif)
with Image.open(out_gif) as reread:
reread_value = reread.convert("RGB").getpixel((1, 1))
difference = sum(abs(original_value[i] - reread_value[i]) for i in range(0, 3))
assert difference < 5
@skip_unless_feature("webp")
@skip_unless_feature("webp_anim")
def test_duration(self, tmp_path):
with Image.open("Tests/images/dispose_bgnd.gif") as im:
assert im.info["duration"] == 1000
out_webp = str(tmp_path / "temp.webp")
im.save(out_webp, save_all=True)
with Image.open(out_webp) as reloaded:
reloaded.load()
assert reloaded.info["duration"] == 1000