Pillow/Tests/test_file_webp.py
2020-02-23 00:06:21 +11:00

181 lines
5.6 KiB
Python

import pytest
from PIL import Image, WebPImagePlugin
from .helper import (
PillowTestCase,
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(PillowTestCase):
def test_unsupported(self):
if HAVE_WEBP:
WebPImagePlugin.SUPPORTED = False
file_path = "Tests/images/hopper.webp"
pytest.warns(
UserWarning, lambda: self.assertRaises(IOError, Image.open, file_path)
)
if HAVE_WEBP:
WebPImagePlugin.SUPPORTED = True
@skip_unless_feature("webp")
class TestFileWebp(PillowTestCase):
def setUp(self):
self.rgb_mode = "RGB"
def test_version(self):
_webp.WebPDecoderVersion()
_webp.WebPDecoderBuggyAlpha()
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 test_write_rgb(self):
"""
Can we write a RGB mode file to webp without error.
Does it have the bits we expect?
"""
temp_file = self.tempfile("temp.webp")
hopper(self.rgb_mode).save(temp_file)
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()
# 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. The old lena images for WebP are showing ~16 on
# Ubuntu, the jpegs are showing ~18.
target = hopper(self.rgb_mode)
assert_image_similar(image, target, 12.0)
def test_write_unsupported_mode_L(self):
"""
Saving a black-and-white file to WebP format should work, and be
similar to the original file.
"""
temp_file = self.tempfile("temp.webp")
hopper("L").save(temp_file)
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()
target = hopper("L").convert(self.rgb_mode)
assert_image_similar(image, target, 10.0)
def test_write_unsupported_mode_P(self):
"""
Saving a palette-based file to WebP format should work, and be
similar to the original file.
"""
temp_file = self.tempfile("temp.webp")
hopper("P").save(temp_file)
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()
target = hopper("P").convert(self.rgb_mode)
assert_image_similar(image, target, 50.0)
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):
file_path = "Tests/images/hopper.webp"
with Image.open(file_path) as image:
temp_file = self.tempfile("temp.webp")
pytest.warns(None, 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):
with Image.open("Tests/images/chi.gif") as im:
original_value = im.convert("RGB").getpixel((1, 1))
# Save as WEBP
out_webp = self.tempfile("temp.webp")
im.save(out_webp, save_all=True)
# Save as GIF
out_gif = self.tempfile("temp.gif")
Image.open(out_webp).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