Pillow/test/test_image_crop.py
2014-06-04 09:09:23 +03:00

60 lines
1.7 KiB
Python

from tester import unittest, PillowTestCase, lena
from PIL import Image
class TestImageCrop(PillowTestCase):
def test_crop(self):
def crop(mode):
out = lena(mode).crop((50, 50, 100, 100))
self.assertEqual(out.mode, mode)
self.assertEqual(out.size, (50, 50))
for mode in "1", "P", "L", "RGB", "I", "F":
crop(mode)
def test_wide_crop(self):
def crop(*bbox):
i = im.crop(bbox)
h = i.histogram()
while h and not h[-1]:
del h[-1]
return tuple(h)
im = Image.new("L", (100, 100), 1)
self.assertEqual(crop(0, 0, 100, 100), (0, 10000))
self.assertEqual(crop(25, 25, 75, 75), (0, 2500))
# sides
self.assertEqual(crop(-25, 0, 25, 50), (1250, 1250))
self.assertEqual(crop(0, -25, 50, 25), (1250, 1250))
self.assertEqual(crop(75, 0, 125, 50), (1250, 1250))
self.assertEqual(crop(0, 75, 50, 125), (1250, 1250))
self.assertEqual(crop(-25, 25, 125, 75), (2500, 5000))
self.assertEqual(crop(25, -25, 75, 125), (2500, 5000))
# corners
self.assertEqual(crop(-25, -25, 25, 25), (1875, 625))
self.assertEqual(crop(75, -25, 125, 25), (1875, 625))
self.assertEqual(crop(75, 75, 125, 125), (1875, 625))
self.assertEqual(crop(-25, 75, 25, 125), (1875, 625))
def test_negative_crop(self):
# Check negative crop size (@PIL171)
im = Image.new("L", (512, 512))
im = im.crop((400, 400, 200, 200))
self.assertEqual(im.size, (0, 0))
self.assertEqual(len(im.getdata()), 0)
self.assertRaises(IndexError, lambda: im.getdata()[0])
if __name__ == '__main__':
unittest.main()
# End of file