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quad test, with blank space test

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wiredfool 2013-09-30 22:01:23 -07:00
parent 2241f744d9
commit 2afdc3776d
1 changed files with 30 additions and 1 deletions
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31
Tests/test_image_transform.py
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@ -26,4 +26,33 @@ def test_quad():
scaled = im.resize((w*2, h*2), Image.BILINEAR).crop((0,0,w,h)) scaled = im.resize((w*2, h*2), Image.BILINEAR).crop((0,0,w,h))
assert_image_equal(transformed, scaled, 10) assert_image_equal(transformed, scaled)
def test_mesh():
# this should be a checkerboard of halfsized lenas in ul, lr
im = lena('RGBA')
(w,h) = im.size
transformed = im.transform(im.size, Image.MESH,
[((0,0,w/2,h/2), # box
(0,0,0,h,
w,h,w,0)), # ul -> ccw around quad
((w/2,h/2,w,h), # box
(0,0,0,h,
w,h,w,0))], # ul -> ccw around quad
Image.BILINEAR)
scaled = im.resize((w/2, h/2), Image.BILINEAR)
checker = Image.new('RGBA', im.size)
checker.paste(scaled, (0,0))
checker.paste(scaled, (w/2,h/2))
assert_image_equal(transformed, checker)
# now, check to see that the extra area is (0,0,0,0)
blank = Image.new('RGBA', (w/2,h/2), (0,0,0,0))
assert_image_equal(blank, transformed.crop((w/2,0,w,h/2)))
assert_image_equal(blank, transformed.crop((0,h/2,w/2,h)))