Pillow/Tests/test_file_webp.py
2015-07-03 15:03:25 +10:00

85 lines
2.4 KiB
Python

from helper import unittest, PillowTestCase, hopper
from PIL import Image
try:
from PIL import _webp
except ImportError:
# Skip in setUp()
pass
class TestFileWebp(PillowTestCase):
def setUp(self):
try:
from PIL import _webp
except ImportError:
self.skipTest('WebP support not installed')
def test_version(self):
_webp.WebPDecoderVersion()
_webp.WebPDecoderBuggyAlpha()
def test_read_rgb(self):
file_path = "Tests/images/hopper.webp"
image = Image.open(file_path)
self.assertEqual(image.mode, "RGB")
self.assertEqual(image.size, (128, 128))
self.assertEqual(image.format, "WEBP")
image.load()
image.getdata()
# generated with:
# dwebp -ppm ../../Tests/images/hopper.webp -o hopper_webp_bits.ppm
target = Image.open('Tests/images/hopper_webp_bits.ppm')
self.assert_image_similar(image, target, 20.0)
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("RGB").save(temp_file)
image = Image.open(temp_file)
image.load()
self.assertEqual(image.mode, "RGB")
self.assertEqual(image.size, (128, 128))
self.assertEqual(image.format, "WEBP")
image.load()
image.getdata()
# If we're using the exact same version of WebP, this test should pass.
# but it doesn't if the WebP is generated on Ubuntu and tested on
# Fedora.
# generated with: dwebp -ppm temp.webp -o hopper_webp_write.ppm
# target = Image.open('Tests/images/hopper_webp_write.ppm')
# self.assert_image_equal(image, target)
# 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("RGB")
self.assert_image_similar(image, target, 12)
def test_write_unsupported_mode(self):
temp_file = self.tempfile("temp.webp")
self.assertRaises(IOError, lambda: hopper("L").save(temp_file))
if __name__ == '__main__':
unittest.main()
# End of file