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96 lines
2.6 KiB
Python
96 lines
2.6 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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pass
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# Skip in setUp()
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class TestFileWebpAlpha(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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if _webp.WebPDecoderBuggyAlpha(self):
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self.skipTest("Buggy early version of WebP installed, "
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"not testing transparency")
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def test_read_rgba(self):
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# Generated with `cwebp transparent.png -o transparent.webp`
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file_path = "Tests/images/transparent.webp"
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image = Image.open(file_path)
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self.assertEqual(image.mode, "RGBA")
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self.assertEqual(image.size, (200, 150))
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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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image.tobytes()
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target = Image.open('Tests/images/transparent.png')
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self.assert_image_similar(image, target, 20.0)
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def test_write_lossless_rgb(self):
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temp_file = self.tempfile("temp.webp")
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# temp_file = "temp.webp"
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pil_image = hopper('RGBA')
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mask = Image.new("RGBA", (64, 64), (128, 128, 128, 128))
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# Add some partially transparent bits:
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pil_image.paste(mask, (0, 0), mask)
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pil_image.save(temp_file, lossless=True)
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image = Image.open(temp_file)
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image.load()
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self.assertEqual(image.mode, "RGBA")
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self.assertEqual(image.size, pil_image.size)
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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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self.assert_image_equal(image, pil_image)
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def test_write_rgba(self):
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"""
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Can we write a RGBA 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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pil_image = Image.new("RGBA", (10, 10), (255, 0, 0, 20))
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pil_image.save(temp_file)
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if _webp.WebPDecoderBuggyAlpha(self):
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return
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image = Image.open(temp_file)
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image.load()
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self.assertEqual(image.mode, "RGBA")
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self.assertEqual(image.size, (10, 10))
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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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# early versions of webp are known to produce higher deviations:
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# deal with it
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if _webp.WebPDecoderVersion(self) <= 0x201:
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self.assert_image_similar(image, pil_image, 3.0)
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else:
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self.assert_image_similar(image, pil_image, 1.0)
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if __name__ == '__main__':
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unittest.main()
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