def test_render_diff_r02(self):
"""Glyphs are identical"""
img_a_px = [
255,
1,
1,
1,
255,
1,
255,
255,
255,
1,
1,
1,
255,
1,
255,
255,
]
img_b_px = img_a_px
img_a = Image.new('L', (4, 4))
img_a.putdata(img_a_px)
img_b = Image.new('L', (4, 4))
img_b.putdata(img_b_px)
self.assertEqual(_diff_images(img_a, img_b), 0.0)
def test_render_diff_r03(self):
"""Glyphs are offset.
TODO (M FOLEY) this should return a match.
The glyphs haven't changed, just the metrics"""
img_a_px = [
0,
0,
255,
255,
0,
0,
255,
255,
255,
255,
255,
255,
255,
255,
255,
255,
]
img_b_px = [
255,
255,
255,
255,
255,
0,
0,
255,
255,
0,
0,
255,
255,
255,
255,
255,
]
img_a = Image.new('L', (4, 4))
img_a.putdata(img_a_px)
img_b = Image.new('L', (4, 4))
img_b.putdata(img_b_px)
self.assertEqual(_diff_images(img_a, img_b), 0.375)
def test_render_diff_r01(self):
"""Compare a crude F against a blank glyph.
Half the pixels have changed"""
img_a_px = [
255,
1,
1,
1,
255,
1,
255,
255,
255,
1,
1,
1,
255,
1,
255,
255,
]
img_b_px = [
255,
255,
255,
255,
255,
255,
255,
255,
255,
255,
255,
255,
255,
255,
255,
255,
]
img_a = Image.new('L', (4, 4))
img_a.putdata(img_a_px)
img_b = Image.new('L', (4, 4))
img_b.putdata(img_b_px)
self.assertEqual(_diff_images(img_a, img_b), 0.5)