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Add test for saving split fdat chunks

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Peter Rowlands 2019-12-02 14:44:32 +09:00 committed by Andrew Murray
parent 35148b99c1
commit 66c84f258b
1 changed files with 23 additions and 0 deletions
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23
Tests/test_file_png.py
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@ -948,6 +948,29 @@ class TestFilePng(PillowTestCase):
self.assertEqual(im.getpixel((0, 0)), (0, 255, 0, 255)) self.assertEqual(im.getpixel((0, 0)), (0, 255, 0, 255))
self.assertEqual(im.getpixel((64, 32)), (0, 255, 0, 255)) self.assertEqual(im.getpixel((64, 32)), (0, 255, 0, 255))
def test_apng_save_split_fdat(self):
# test to make sure we do not generate sequence errors when writing
# frames with image data spanning multiple fdAT chunks (in this case
# both the default image and first animation frame will span multiple
# data chunks)
test_file = self.tempfile("temp.png")
with Image.open("Tests/images/old-style-jpeg-compression.png") as im:
frames = [im.copy(), Image.new("RGBA", im.size, (255, 0, 0, 255))]
im.save(
test_file,
save_all=True,
default_image=True,
append_images=frames,
)
with Image.open(test_file) as im:
exception = None
try:
im.seek(im.n_frames - 1)
im.load()
except Exception as e:
exception = e
self.assertIsNone(exception)
def test_apng_save_duration_loop(self): def test_apng_save_duration_loop(self):
test_file = self.tempfile("temp.png") test_file = self.tempfile("temp.png")
im = Image.open("Tests/images/apng/delay.png") im = Image.open("Tests/images/apng/delay.png")