from helper import unittest, PillowTestCase, hopper from PIL import Image, ImageDraw class TestImagingResampleVulnerability(PillowTestCase): # see https://github.com/python-pillow/Pillow/issues/1710 def test_overflow(self): im = hopper('L') xsize = 0x100000008 // 4 ysize = 1000 # unimportant try: # any resampling filter will do here im.im.resize((xsize, ysize), Image.LINEAR) self.fail("Resize should raise MemoryError on invalid xsize") except MemoryError: self.assertTrue(True, "Should raise MemoryError") def test_invalid_size(self): im = hopper() im.resize((100, 100)) self.assertTrue(True, "Should not Crash") try: im.resize((-100, 100)) self.fail("Resize should raise a value error on x negative size") except ValueError: self.assertTrue(True, "Should raise ValueError") try: im.resize((100, -100)) self.fail("Resize should raise a value error on y negative size") except ValueError: self.assertTrue(True, "Should raise ValueError") class TestImagingCoreResampleAccuracy(PillowTestCase): def make_case(self, size, color): """Makes a sample image with two dark and two bright squares. For example: e0 e0 1f 1f e0 e0 1f 1f 1f 1f e0 e0 1f 1f e0 e0 """ dark = (255 - color, 255 - color, 255 - color, 255 - color) bright = (color, color, color, color) i = Image.new('RGBX', size, dark) rectangle = ImageDraw.Draw(i).rectangle rectangle((0, 0, size[0] // 2 - 1, size[1] // 2 - 1), bright) rectangle((size[0] // 2, size[1] // 2, size[0], size[1]), bright) return i def make_sample(self, data, size): """Restores a sample image from given data string which contains hex-encoded pixels from the top left fourth of a sample. """ data = data.replace(' ', '') sample = Image.new('L', size) s_px = sample.load() w, h = size[0] // 2, size[1] // 2 for y in range(h): for x in range(w): val = int(data[(y * w + x) * 2:(y * w + x + 1) * 2], 16) s_px[x, y] = val s_px[size[0] - x - 1, size[1] - y - 1] = val s_px[x, size[1] - y - 1] = 255 - val s_px[size[0] - x - 1, y] = 255 - val return sample def check_case(self, case, sample): for channel in case.split(): s_px = sample.load() c_px = channel.load() for y in range(case.size[1]): for x in range(case.size[0]): if c_px[x, y] != s_px[x, y]: message = '\nHave: \n{}\n\nExpected: \n{}'.format( self.serialize_image(channel), self.serialize_image(sample), ) self.assertEqual(s_px[x, y], c_px[x, y], message) def serialize_image(self, image): s_px = image.load() return '\n'.join( ' '.join( '{:02x}'.format(s_px[x, y]) for x in range(image.size[0]) ) for y in range(image.size[1]) ) def test_reduce_bilinear(self): case = self.make_case((8, 8), 0xe1) data = ('e1 c9' 'c9 b7') self.check_case( case.resize((4, 4), Image.BILINEAR), self.make_sample(data, (4, 4))) def test_reduce_bicubic(self): case = self.make_case((12, 12), 0xe1) data = ('e1 e3 d4' 'e3 e5 d6' 'd4 d6 c9') self.check_case( case.resize((6, 6), Image.BICUBIC), self.make_sample(data, (6, 6))) def test_reduce_lanczos(self): case = self.make_case((16, 16), 0xe1) data = ('e1 e0 e4 d7' 'e0 df e3 d6' 'e4 e3 e7 da' 'd7 d6 d9 ce') self.check_case( case.resize((8, 8), Image.LANCZOS), self.make_sample(data, (8, 8))) def test_enlarge_bilinear(self): case = self.make_case((2, 2), 0xe1) data = ('e1 b0' 'b0 98') self.check_case( case.resize((4, 4), Image.BILINEAR), self.make_sample(data, (4, 4))) def test_enlarge_bicubic(self): case = self.make_case((4, 4), 0xe1) data = ('e1 e5 ee b9' 'e5 e9 f3 bc' 'ee f3 fd c1' 'b9 bc c1 a2') self.check_case( case.resize((8, 8), Image.BICUBIC), self.make_sample(data, (8, 8))) def test_enlarge_lanczos(self): case = self.make_case((6, 6), 0xe1) data = ('e1 e0 db ed f5 b8' 'e0 df da ec f3 b7' 'db db d6 e7 ee b5' 'ed ec e6 fb ff bf' 'f5 f4 ee ff ff c4' 'b8 b7 b4 bf c4 a0') self.check_case( case.resize((12, 12), Image.LANCZOS), self.make_sample(data, (12, 12))) class CoreResampleConsistencyTest(PillowTestCase): def make_case(self, mode, fill): im = Image.new(mode, (512, 9), fill) return (im.resize((9, 512), Image.LANCZOS), im.load()[0, 0]) def run_case(self, case): channel, color = case px = channel.load() for x in range(channel.size[0]): for y in range(channel.size[1]): if px[x, y] != color: message = "{} != {} for pixel {}".format( px[x, y], color, (x, y)) self.assertEqual(px[x, y], color, message) def test_8u(self): im, color = self.make_case('RGB', (0, 64, 255)) r, g, b = im.split() self.run_case((r, color[0])) self.run_case((g, color[1])) self.run_case((b, color[2])) self.run_case(self.make_case('L', 12)) def test_32i(self): self.run_case(self.make_case('I', 12)) self.run_case(self.make_case('I', 0x7fffffff)) self.run_case(self.make_case('I', -12)) self.run_case(self.make_case('I', -1 << 31)) def test_32f(self): self.run_case(self.make_case('F', 1)) self.run_case(self.make_case('F', 3.40282306074e+38)) self.run_case(self.make_case('F', 1.175494e-38)) self.run_case(self.make_case('F', 1.192093e-07)) class CoreResampleAlphaCorrectTest(PillowTestCase): def make_levels_case(self, mode): i = Image.new(mode, (256, 16)) px = i.load() for y in range(i.size[1]): for x in range(i.size[0]): pix = [x] * len(mode) pix[-1] = 255 - y * 16 px[x, y] = tuple(pix) return i def run_levels_case(self, i): px = i.load() for y in range(i.size[1]): used_colors = set(px[x, y][0] for x in range(i.size[0])) self.assertEqual(256, len(used_colors), 'All colors should present in resized image. ' 'Only {0} on {1} line.'.format(len(used_colors), y)) @unittest.skip("current implementation isn't precise enough") def test_levels_rgba(self): case = self.make_levels_case('RGBA') self.run_levels_case(case.resize((512, 32), Image.BILINEAR)) self.run_levels_case(case.resize((512, 32), Image.BICUBIC)) self.run_levels_case(case.resize((512, 32), Image.LANCZOS)) @unittest.skip("current implementation isn't precise enough") def test_levels_la(self): case = self.make_levels_case('LA') self.run_levels_case(case.resize((512, 32), Image.BILINEAR)) self.run_levels_case(case.resize((512, 32), Image.BICUBIC)) self.run_levels_case(case.resize((512, 32), Image.LANCZOS)) def make_dity_case(self, mode, clean_pixel, dirty_pixel): i = Image.new(mode, (64, 64), dirty_pixel) px = i.load() xdiv4 = i.size[0] // 4 ydiv4 = i.size[1] // 4 for y in range(ydiv4 * 2): for x in range(xdiv4 * 2): px[x + xdiv4, y + ydiv4] = clean_pixel return i def run_dity_case(self, i, clean_pixel): px = i.load() for y in range(i.size[1]): for x in range(i.size[0]): if px[x, y][-1] != 0 and px[x, y][:-1] != clean_pixel: message = 'pixel at ({0}, {1}) is differ:\n{2}\n{3}'\ .format(x, y, px[x, y], clean_pixel) self.assertEqual(px[x, y][:3], clean_pixel, message) def test_dirty_pixels_rgba(self): case = self.make_dity_case('RGBA', (255, 255, 0, 128), (0, 0, 255, 0)) self.run_dity_case(case.resize((20, 20), Image.BILINEAR), (255, 255, 0)) self.run_dity_case(case.resize((20, 20), Image.BICUBIC), (255, 255, 0)) self.run_dity_case(case.resize((20, 20), Image.LANCZOS), (255, 255, 0)) def test_dirty_pixels_la(self): case = self.make_dity_case('LA', (255, 128), (0, 0)) self.run_dity_case(case.resize((20, 20), Image.BILINEAR), (255,)) self.run_dity_case(case.resize((20, 20), Image.BICUBIC), (255,)) self.run_dity_case(case.resize((20, 20), Image.LANCZOS), (255,)) if __name__ == '__main__': unittest.main()