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120 lines
3.6 KiB
Python
120 lines
3.6 KiB
Python
import unittest
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from PIL import Image
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from .helper import PillowTestCase, assert_image_equal, assert_image_similar, 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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with Image.open(file_path) as image:
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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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with Image.open("Tests/images/transparent.png") as target:
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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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with Image.open(temp_file) as image:
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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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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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with Image.open(temp_file) as image:
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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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assert_image_similar(image, pil_image, 3.0)
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else:
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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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with Image.open(temp_file) as image:
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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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assert_image_similar(image, target, 25.0)
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