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Test for endianness issues in stretch

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Eric Soroos 2014-11-07 14:47:23 -08:00 committed by homm
parent b8a2b5b907
commit 2657c0dec0
1 changed files with 67 additions and 0 deletions
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67
Tests/test_imaging_stretch.py
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@ -39,6 +39,73 @@ class TestImagingStretch(PillowTestCase):
self.assertEqual(r.mode, "RGB") self.assertEqual(r.mode, "RGB")
self.assertEqual(r.size, (764, 414)) self.assertEqual(r.size, (764, 414))
def test_endianess(self):
# Make an image with one colored pixel, in one channel.
# When stretched, that channel should be the same as a GS image.
# Other channels should be unaffected.
# The R and A channels should not swap, which is indicitive of
# an endianess issues
im = Image.new('L', (2,2), 0)
im.putpixel((1,1),128)
blank = Image.new('L', (4,4), 0)
alpha = Image.new('L', (4,4), 255)
for f in [Image.BILINEAR, Image.BICUBIC, Image.ANTIALIAS]:
im_r = Image.new('RGBA', (2,2), (0,0,0,255))
im_r.putpixel((1,1),(128,0,0,255))
target = im._new(im.im.stretch((4,4), f))
stretched = im_r._new(im_r.im.stretch((4,4),f))
self.assert_image_equal(stretched.split()[0],target)
self.assert_image_equal(stretched.split()[1],blank)
self.assert_image_equal(stretched.split()[2],blank)
self.assert_image_equal(stretched.split()[3],alpha)
im_r = Image.new('RGB', (2,2), (0,0,0))
im_r.putpixel((1,1),(128,0,0))
target = im._new(im.im.stretch((4,4), f))
stretched = im_r._new(im_r.im.stretch((4,4),f))
#print " ".join(hex(ord(s)) for s in stretched.split()[0].tobytes())
#print " ".join(hex(ord(s)) for s in stretched.split()[1].tobytes())
#print " ".join(hex(ord(s)) for s in stretched.split()[2].tobytes())
#print " ".join(hex(ord(s)) for s in target.tobytes())
#print
self.assert_image_equal(stretched.split()[0],target, 'rxRGB R channel fail')
self.assert_image_equal(stretched.split()[1],blank, 'rxRGB G channel fail')
self.assert_image_equal(stretched.split()[2],blank, 'rxRGB B channel fail')
im_g = Image.new('RGBA', (2,2), (0,0,0,255))
im_g.putpixel((1,1),(0,128,0,255))
stretched = im_g._new(im_g.im.stretch((4,4),f))
self.assert_image_equal(stretched.split()[0],blank)
self.assert_image_equal(stretched.split()[1],target)
self.assert_image_equal(stretched.split()[2],blank)
self.assert_image_equal(stretched.split()[3],alpha)
im_g = Image.new('RGB', (2,2), (0,0,0))
im_g.putpixel((1,1),(0,128,0))
target = im._new(im.im.stretch((4,4), f))
stretched = im_g._new(im_g.im.stretch((4,4),f))
self.assert_image_equal(stretched.split()[0],blank, 'gxRGB R channel fail')
self.assert_image_equal(stretched.split()[1],target, 'gxRGB G channel fail')
self.assert_image_equal(stretched.split()[2],blank, 'gxRGB B channel fail')
if __name__ == '__main__': if __name__ == '__main__':
unittest.main() unittest.main()