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Add test for saving split fdat chunks
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@ -948,6 +948,29 @@ class TestFilePng(PillowTestCase):
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self.assertEqual(im.getpixel((0, 0)), (0, 255, 0, 255))
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self.assertEqual(im.getpixel((64, 32)), (0, 255, 0, 255))
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def test_apng_save_split_fdat(self):
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# test to make sure we do not generate sequence errors when writing
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# frames with image data spanning multiple fdAT chunks (in this case
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# both the default image and first animation frame will span multiple
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# data chunks)
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test_file = self.tempfile("temp.png")
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with Image.open("Tests/images/old-style-jpeg-compression.png") as im:
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frames = [im.copy(), Image.new("RGBA", im.size, (255, 0, 0, 255))]
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im.save(
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test_file,
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save_all=True,
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default_image=True,
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append_images=frames,
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)
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with Image.open(test_file) as im:
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exception = None
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try:
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im.seek(im.n_frames - 1)
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im.load()
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except Exception as e:
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exception = e
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self.assertIsNone(exception)
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def test_apng_save_duration_loop(self):
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test_file = self.tempfile("temp.png")
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im = Image.open("Tests/images/apng/delay.png")
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