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85 lines
2.4 KiB
Python
85 lines
2.4 KiB
Python
from helper import unittest, PillowTestCase, hopper
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from PIL import Image
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try:
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from PIL import _webp
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except ImportError:
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# Skip in setUp()
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pass
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class TestFileWebp(PillowTestCase):
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def setUp(self):
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try:
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from PIL import _webp
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except ImportError:
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self.skipTest('WebP support not installed')
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def test_version(self):
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_webp.WebPDecoderVersion()
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_webp.WebPDecoderBuggyAlpha()
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def test_read_rgb(self):
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file_path = "Tests/images/hopper.webp"
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image = Image.open(file_path)
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self.assertEqual(image.mode, "RGB")
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self.assertEqual(image.size, (128, 128))
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self.assertEqual(image.format, "WEBP")
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image.load()
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image.getdata()
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# generated with:
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# dwebp -ppm ../../Tests/images/hopper.webp -o hopper_webp_bits.ppm
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target = Image.open('Tests/images/hopper_webp_bits.ppm')
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self.assert_image_similar(image, target, 20.0)
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def test_write_rgb(self):
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"""
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Can we write a RGB mode file to webp without error.
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Does it have the bits we expect?
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"""
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temp_file = self.tempfile("temp.webp")
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hopper("RGB").save(temp_file)
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image = Image.open(temp_file)
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image.load()
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self.assertEqual(image.mode, "RGB")
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self.assertEqual(image.size, (128, 128))
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self.assertEqual(image.format, "WEBP")
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image.load()
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image.getdata()
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# If we're using the exact same version of WebP, this test should pass.
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# but it doesn't if the WebP is generated on Ubuntu and tested on
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# Fedora.
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# generated with: dwebp -ppm temp.webp -o hopper_webp_write.ppm
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# target = Image.open('Tests/images/hopper_webp_write.ppm')
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# self.assert_image_equal(image, target)
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# This test asserts that the images are similar. If the average pixel
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# difference between the two images is less than the epsilon value,
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# then we're going to accept that it's a reasonable lossy version of
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# the image. The old lena images for WebP are showing ~16 on
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# Ubuntu, the jpegs are showing ~18.
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target = hopper("RGB")
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self.assert_image_similar(image, target, 12)
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def test_write_unsupported_mode(self):
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temp_file = self.tempfile("temp.webp")
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self.assertRaises(IOError, lambda: hopper("L").save(temp_file))
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if __name__ == '__main__':
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unittest.main()
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# End of file
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