mirror of
https://github.com/python-pillow/Pillow.git
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382 lines
12 KiB
Python
382 lines
12 KiB
Python
from helper import unittest, PillowTestCase, hopper
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from io import BytesIO
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from PIL import Image
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from PIL import PngImagePlugin
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import zlib
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codecs = dir(Image.core)
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# sample png stream
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TEST_PNG_FILE = "Tests/images/hopper.png"
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TEST_DATA = open(TEST_PNG_FILE, "rb").read()
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# stuff to create inline PNG images
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MAGIC = PngImagePlugin._MAGIC
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def chunk(cid, *data):
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file = BytesIO()
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PngImagePlugin.putchunk(*(file, cid) + data)
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return file.getvalue()
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o32 = PngImagePlugin.o32
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IHDR = chunk(b"IHDR", o32(1), o32(1), b'\x08\x02', b'\0\0\0')
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IDAT = chunk(b"IDAT")
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IEND = chunk(b"IEND")
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HEAD = MAGIC + IHDR
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TAIL = IDAT + IEND
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def load(data):
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return Image.open(BytesIO(data))
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def roundtrip(im, **options):
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out = BytesIO()
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im.save(out, "PNG", **options)
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out.seek(0)
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return Image.open(out)
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class TestFilePng(PillowTestCase):
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def setUp(self):
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if "zip_encoder" not in codecs or "zip_decoder" not in codecs:
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self.skipTest("zip/deflate support not available")
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def test_sanity(self):
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# internal version number
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self.assertRegexpMatches(
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Image.core.zlib_version, "\d+\.\d+\.\d+(\.\d+)?$")
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file = self.tempfile("temp.png")
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hopper("RGB").save(file)
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im = Image.open(file)
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im.load()
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self.assertEqual(im.mode, "RGB")
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self.assertEqual(im.size, (128, 128))
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self.assertEqual(im.format, "PNG")
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hopper("1").save(file)
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im = Image.open(file)
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hopper("L").save(file)
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im = Image.open(file)
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hopper("P").save(file)
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im = Image.open(file)
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hopper("RGB").save(file)
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im = Image.open(file)
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hopper("I").save(file)
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im = Image.open(file)
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def test_broken(self):
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# Check reading of totally broken files. In this case, the test
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# file was checked into Subversion as a text file.
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file = "Tests/images/broken.png"
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self.assertRaises(IOError, lambda: Image.open(file))
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def test_bad_text(self):
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# Make sure PIL can read malformed tEXt chunks (@PIL152)
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im = load(HEAD + chunk(b'tEXt') + TAIL)
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self.assertEqual(im.info, {})
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im = load(HEAD + chunk(b'tEXt', b'spam') + TAIL)
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self.assertEqual(im.info, {'spam': ''})
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im = load(HEAD + chunk(b'tEXt', b'spam\0') + TAIL)
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self.assertEqual(im.info, {'spam': ''})
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im = load(HEAD + chunk(b'tEXt', b'spam\0egg') + TAIL)
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self.assertEqual(im.info, {'spam': 'egg'})
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im = load(HEAD + chunk(b'tEXt', b'spam\0egg\0') + TAIL)
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self.assertEqual(im.info, {'spam': 'egg\x00'})
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def test_bad_ztxt(self):
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# Test reading malformed zTXt chunks (python-pillow/Pillow#318)
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im = load(HEAD + chunk(b'zTXt') + TAIL)
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self.assertEqual(im.info, {})
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im = load(HEAD + chunk(b'zTXt', b'spam') + TAIL)
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self.assertEqual(im.info, {'spam': ''})
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im = load(HEAD + chunk(b'zTXt', b'spam\0') + TAIL)
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self.assertEqual(im.info, {'spam': ''})
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im = load(HEAD + chunk(b'zTXt', b'spam\0\0') + TAIL)
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self.assertEqual(im.info, {'spam': ''})
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im = load(HEAD + chunk(
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b'zTXt', b'spam\0\0' + zlib.compress(b'egg')[:1]) + TAIL)
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self.assertEqual(im.info, {'spam': ''})
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im = load(
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HEAD + chunk(b'zTXt', b'spam\0\0' + zlib.compress(b'egg')) + TAIL)
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self.assertEqual(im.info, {'spam': 'egg'})
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def test_bad_itxt(self):
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im = load(HEAD + chunk(b'iTXt') + TAIL)
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self.assertEqual(im.info, {})
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im = load(HEAD + chunk(b'iTXt', b'spam') + TAIL)
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self.assertEqual(im.info, {})
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im = load(HEAD + chunk(b'iTXt', b'spam\0') + TAIL)
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self.assertEqual(im.info, {})
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im = load(HEAD + chunk(b'iTXt', b'spam\0\x02') + TAIL)
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self.assertEqual(im.info, {})
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im = load(HEAD + chunk(b'iTXt', b'spam\0\0\0foo\0') + TAIL)
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self.assertEqual(im.info, {})
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im = load(HEAD + chunk(b'iTXt', b'spam\0\0\0en\0Spam\0egg') + TAIL)
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self.assertEqual(im.info, {"spam": "egg"})
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self.assertEqual(im.info["spam"].lang, "en")
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self.assertEqual(im.info["spam"].tkey, "Spam")
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im = load(HEAD + chunk(b'iTXt', b'spam\0\1\0en\0Spam\0' +
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zlib.compress(b"egg")[:1]) + TAIL)
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self.assertEqual(im.info, {'spam':''})
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im = load(HEAD + chunk(b'iTXt', b'spam\0\1\1en\0Spam\0' +
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zlib.compress(b"egg")) + TAIL)
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self.assertEqual(im.info, {})
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im = load(HEAD + chunk(b'iTXt', b'spam\0\1\0en\0Spam\0' +
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zlib.compress(b"egg")) + TAIL)
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self.assertEqual(im.info, {"spam": "egg"})
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self.assertEqual(im.info["spam"].lang, "en")
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self.assertEqual(im.info["spam"].tkey, "Spam")
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def test_interlace(self):
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file = "Tests/images/pil123p.png"
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im = Image.open(file)
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self.assert_image(im, "P", (162, 150))
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self.assertTrue(im.info.get("interlace"))
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im.load()
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file = "Tests/images/pil123rgba.png"
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im = Image.open(file)
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self.assert_image(im, "RGBA", (162, 150))
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self.assertTrue(im.info.get("interlace"))
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im.load()
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def test_load_transparent_p(self):
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file = "Tests/images/pil123p.png"
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im = Image.open(file)
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self.assert_image(im, "P", (162, 150))
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im = im.convert("RGBA")
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self.assert_image(im, "RGBA", (162, 150))
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# image has 124 uniqe qlpha values
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self.assertEqual(len(im.split()[3].getcolors()), 124)
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def test_load_transparent_rgb(self):
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file = "Tests/images/rgb_trns.png"
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im = Image.open(file)
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self.assert_image(im, "RGB", (64, 64))
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im = im.convert("RGBA")
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self.assert_image(im, "RGBA", (64, 64))
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# image has 876 transparent pixels
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self.assertEqual(im.split()[3].getcolors()[0][0], 876)
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def test_save_p_transparent_palette(self):
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in_file = "Tests/images/pil123p.png"
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im = Image.open(in_file)
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file = self.tempfile("temp.png")
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im.save(file)
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def test_save_p_single_transparency(self):
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in_file = "Tests/images/p_trns_single.png"
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im = Image.open(in_file)
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file = self.tempfile("temp.png")
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im.save(file)
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def test_save_l_transparency(self):
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in_file = "Tests/images/l_trns.png"
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im = Image.open(in_file)
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file = self.tempfile("temp.png")
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im.save(file)
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# There are 559 transparent pixels.
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im = im.convert('RGBA')
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self.assertEqual(im.split()[3].getcolors()[0][0], 559)
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def test_save_rgb_single_transparency(self):
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in_file = "Tests/images/caption_6_33_22.png"
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im = Image.open(in_file)
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file = self.tempfile("temp.png")
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im.save(file)
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def test_load_verify(self):
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# Check open/load/verify exception (@PIL150)
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im = Image.open(TEST_PNG_FILE)
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im.verify()
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im = Image.open(TEST_PNG_FILE)
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im.load()
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self.assertRaises(RuntimeError, lambda: im.verify())
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def test_roundtrip_dpi(self):
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# Check dpi roundtripping
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im = Image.open(TEST_PNG_FILE)
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im = roundtrip(im, dpi=(100, 100))
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self.assertEqual(im.info["dpi"], (100, 100))
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def test_roundtrip_text(self):
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# Check text roundtripping
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im = Image.open(TEST_PNG_FILE)
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info = PngImagePlugin.PngInfo()
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info.add_text("TXT", "VALUE")
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info.add_text("ZIP", "VALUE", 1)
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im = roundtrip(im, pnginfo=info)
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self.assertEqual(im.info, {'TXT': 'VALUE', 'ZIP': 'VALUE'})
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self.assertEqual(im.text, {'TXT': 'VALUE', 'ZIP': 'VALUE'})
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def test_roundtrip_itxt(self):
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# Check iTXt roundtripping
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im = Image.new("RGB", (32, 32))
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info = PngImagePlugin.PngInfo()
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info.add_itxt("spam", "Eggs", "en", "Spam")
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info.add_text("eggs", PngImagePlugin.iTXt("Spam", "en", "Eggs"),
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zip=True)
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im = roundtrip(im, pnginfo=info)
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self.assertEqual(im.info, {"spam": "Eggs", "eggs": "Spam"})
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self.assertEqual(im.text, {"spam": "Eggs", "eggs": "Spam"})
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self.assertEqual(im.text["spam"].lang, "en")
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self.assertEqual(im.text["spam"].tkey, "Spam")
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self.assertEqual(im.text["eggs"].lang, "en")
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self.assertEqual(im.text["eggs"].tkey, "Eggs")
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def test_nonunicode_text(self):
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# Check so that non-Unicode text is saved as a tEXt rather than iTXt
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im = Image.new("RGB", (32, 32))
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info = PngImagePlugin.PngInfo()
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info.add_text("Text", "Ascii")
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im = roundtrip(im, pnginfo=info)
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self.assertEqual(type(im.info["Text"]), str)
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def test_unicode_text(self):
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# Check preservation of non-ASCII characters on Python3
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# This cannot really be meaningfully tested on Python2,
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# since it didn't preserve charsets to begin with.
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def rt_text(value):
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im = Image.new("RGB", (32, 32))
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info = PngImagePlugin.PngInfo()
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info.add_text("Text", value)
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im = roundtrip(im, pnginfo=info)
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self.assertEqual(im.info, {"Text": value})
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if str is not bytes:
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rt_text(" Aa" + chr(0xa0) + chr(0xc4) + chr(0xff)) # Latin1
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rt_text(chr(0x400) + chr(0x472) + chr(0x4ff)) # Cyrillic
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rt_text(chr(0x4e00) + chr(0x66f0) + # CJK
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chr(0x9fba) + chr(0x3042) + chr(0xac00))
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rt_text("A" + chr(0xc4) + chr(0x472) + chr(0x3042)) # Combined
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def test_scary(self):
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# Check reading of evil PNG file. For information, see:
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# http://scary.beasts.org/security/CESA-2004-001.txt
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# The first byte is removed from pngtest_bad.png
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# to avoid classification as malware.
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with open("Tests/images/pngtest_bad.png.bin", 'rb') as fd:
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data = b'\x89' + fd.read()
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pngfile = BytesIO(data)
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self.assertRaises(IOError, lambda: Image.open(pngfile))
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def test_trns_rgb(self):
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# Check writing and reading of tRNS chunks for RGB images.
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# Independent file sample provided by Sebastian Spaeth.
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file = "Tests/images/caption_6_33_22.png"
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im = Image.open(file)
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self.assertEqual(im.info["transparency"], (248, 248, 248))
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# check saving transparency by default
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im = roundtrip(im)
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self.assertEqual(im.info["transparency"], (248, 248, 248))
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im = roundtrip(im, transparency=(0, 1, 2))
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self.assertEqual(im.info["transparency"], (0, 1, 2))
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def test_trns_p(self):
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# Check writing a transparency of 0, issue #528
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im = hopper('P')
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im.info['transparency'] = 0
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f = self.tempfile("temp.png")
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im.save(f)
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im2 = Image.open(f)
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self.assertIn('transparency', im2.info)
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self.assert_image_equal(im2.convert('RGBA'),
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im.convert('RGBA'))
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def test_save_icc_profile_none(self):
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# check saving files with an ICC profile set to None (omit profile)
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in_file = "Tests/images/icc_profile_none.png"
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im = Image.open(in_file)
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self.assertEqual(im.info['icc_profile'], None)
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im = roundtrip(im)
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self.assertNotIn('icc_profile', im.info)
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def test_roundtrip_icc_profile(self):
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# check that we can roundtrip the icc profile
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im = hopper('RGB')
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jpeg_image = Image.open('Tests/images/flower2.jpg')
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expected_icc = jpeg_image.info['icc_profile']
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im.info['icc_profile'] = expected_icc
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im = roundtrip(im)
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self.assertEqual(im.info['icc_profile'], expected_icc)
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if __name__ == '__main__':
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unittest.main()
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# End of file
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