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33dabf986f
The unittest in helper.py has not offered an interesting abstraction
since dbe9f85c7d so import from the more
typical stdlib location.
122 lines
3.4 KiB
Python
122 lines
3.4 KiB
Python
import unittest
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from PIL import Image
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from .helper import PillowTestCase, hopper
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try:
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from PIL import _webp
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except ImportError:
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_webp = None
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@unittest.skipIf(_webp is None, "WebP support not installed")
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class TestFileWebpAlpha(PillowTestCase):
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def setUp(self):
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if _webp.WebPDecoderBuggyAlpha(self):
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self.skipTest(
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"Buggy early version of WebP installed, not testing transparency"
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)
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def test_read_rgba(self):
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"""
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Can we read an RGBA mode file without error?
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Does it have the bits we expect?
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"""
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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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"""
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Can we write an RGBA mode file with lossless compression without
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error? 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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# 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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def test_write_unsupported_mode_PA(self):
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"""
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Saving a palette-based file with transparency to WebP format
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should work, and be similar to the original file.
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"""
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temp_file = self.tempfile("temp.webp")
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file_path = "Tests/images/transparent.gif"
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with Image.open(file_path) as im:
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im.save(temp_file)
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image = Image.open(temp_file)
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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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with Image.open(file_path) as im:
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target = im.convert("RGBA")
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self.assert_image_similar(image, target, 25.0)
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