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add failing test for #1838; extend tests for current transparency behavior

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This commit is contained in:
Oliver Tonnhofer 2016-04-19 09:31:15 +02:00
parent 69b1a0e401
commit 0f8d66bc96
1 changed files with 50 additions and 0 deletions
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Tests/test_file_png.py
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@ -203,6 +203,7 @@ class TestFilePng(PillowTestCase):
def test_load_transparent_rgb(self): def test_load_transparent_rgb(self):
test_file = "Tests/images/rgb_trns.png" test_file = "Tests/images/rgb_trns.png"
im = Image.open(test_file) im = Image.open(test_file)
self.assertEqual(im.info["transparency"], (0, 255, 52))
self.assert_image(im, "RGB", (64, 64)) self.assert_image(im, "RGB", (64, 64))
im = im.convert("RGBA") im = im.convert("RGBA")
@ -215,16 +216,65 @@ class TestFilePng(PillowTestCase):
in_file = "Tests/images/pil123p.png" in_file = "Tests/images/pil123p.png"
im = Image.open(in_file) im = Image.open(in_file)
# 'transparency' contains a byte string with the opacity for each palett entry
self.assertEqual(len(im.info["transparency"]), 256)
test_file = self.tempfile("temp.png") test_file = self.tempfile("temp.png")
im.save(test_file) im.save(test_file)
# check if saved image contains same transparency
im = Image.open(test_file)
self.assertEqual(len(im.info["transparency"]), 256)
self.assert_image(im, "P", (162, 150))
im = im.convert("RGBA")
self.assert_image(im, "RGBA", (162, 150))
# image has 124 uniqe qlpha values
self.assertEqual(len(im.split()[3].getcolors()), 124)
def test_save_p_single_transparency(self): def test_save_p_single_transparency(self):
in_file = "Tests/images/p_trns_single.png" in_file = "Tests/images/p_trns_single.png"
im = Image.open(in_file) im = Image.open(in_file)
# pixel value 164 is full transparent
self.assertEqual(im.info["transparency"], 164)
self.assertEqual(im.getpixel((31, 31)), 164)
test_file = self.tempfile("temp.png") test_file = self.tempfile("temp.png")
im.save(test_file) im.save(test_file)
# check if saved image contains same transparency
im = Image.open(test_file)
self.assertEqual(im.info["transparency"], 164)
self.assertEqual(im.getpixel((31, 31)), 164)
self.assert_image(im, "P", (64, 64))
im = im.convert("RGBA")
self.assert_image(im, "RGBA", (64, 64))
self.assertEqual(im.getpixel((31, 31)), (0, 255, 52, 0))
# image has 876 transparent pixels
self.assertEqual(im.split()[3].getcolors()[0][0], 876)
def test_save_p_transparent_black(self):
# check if solid black image with full transparency
# is supported (check for #1838)
im = Image.new("RGBA", (10, 10), (0, 0, 0, 0))
self.assertEqual(im.getcolors(), [(100, (0, 0, 0, 0))])
im = im.convert("P")
test_file = self.tempfile("temp.png")
im.save(test_file)
# check if saved image contains same transparency
im = Image.open(test_file)
self.assertEqual(len(im.info["transparency"]), 256)
self.assert_image(im, "P", (10, 10))
im = im.convert("RGBA")
self.assert_image(im, "RGBA", (10, 10))
self.assertEqual(im.getcolors(), [(100, (0, 0, 0, 0))])
def test_save_l_transparency(self): def test_save_l_transparency(self):
in_file = "Tests/images/l_trns.png" in_file = "Tests/images/l_trns.png"
im = Image.open(in_file) im = Image.open(in_file)