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import unittest
import os
import math
try:
from fontTools.pens.freetypePen import FreeTypePen
FREETYPE_PY_AVAILABLE = True
except ImportError:
FREETYPE_PY_AVAILABLE = False
from fontTools.misc.transform import Scale, Offset
DATA_DIR = os.path.join(os.path.abspath(os.path.dirname(__file__)), "data")
def box(pen, offset=(0, 0)):
pen.moveTo((0 + offset[0], 0 + offset[1]))
pen.lineTo((0 + offset[0], 500 + offset[1]))
pen.lineTo((500 + offset[0], 500 + offset[1]))
pen.lineTo((500 + offset[0], 0 + offset[1]))
pen.closePath()
def draw_cubic(pen):
pen.moveTo((50, 0))
pen.lineTo((50, 500))
pen.lineTo((200, 500))
pen.curveTo((350, 500), (450, 400), (450, 250))
pen.curveTo((450, 100), (350, 0), (200, 0))
pen.closePath()
def draw_quadratic(pen):
pen.moveTo((50, 0))
pen.lineTo((50, 500))
pen.lineTo((200, 500))
pen.qCurveTo((274, 500), (388, 438), (450, 324), (450, 250))
pen.qCurveTo((450, 176), (388, 62), (274, 0), (200, 0))
pen.closePath()
def star(pen):
pen.moveTo((0, 420))
pen.lineTo((1000, 420))
pen.lineTo((200, -200))
pen.lineTo((500, 800))
pen.lineTo((800, -200))
pen.closePath()
# For the PGM format, see the following resources:
# https://en.wikipedia.org/wiki/Netpbm
# http://netpbm.sourceforge.net/doc/pgm.html
def load_pgm(filename):
with open(filename, "rb") as fp:
assert fp.readline() == "P5\n".encode()
w, h = (int(c) for c in fp.readline().decode().rstrip().split(" "))
assert fp.readline() == "255\n".encode()
return fp.read(), (w, h)
def save_pgm(filename, buf, size):
with open(filename, "wb") as fp:
fp.write("P5\n".encode())
fp.write("{0:d} {1:d}\n".format(*size).encode())
fp.write("255\n".encode())
fp.write(buf)
# Assume the buffers are equal when PSNR > 38dB. See also:
# Peak signal-to-noise ratio
# https://en.wikipedia.org/wiki/Peak_signal-to-noise_ratio
PSNR_THRESHOLD = 38.0
def psnr(b1, b2):
import math
mse = sum((c1 - c2) * (c1 - c2) for c1, c2 in zip(b1, b2)) / float(len(b1))
return 10.0 * math.log10((255.0**2) / float(mse)) if mse > 0 else math.inf
@unittest.skipUnless(FREETYPE_PY_AVAILABLE, "freetype-py not installed")
class FreeTypePenTest(unittest.TestCase):
def test_draw(self):
pen = FreeTypePen(None)
box(pen)
width, height = 500, 500
buf1, _ = pen.buffer(width=width, height=height)
buf2 = b"\xff" * width * height
self.assertEqual(buf1, buf2)
def test_empty(self):
pen = FreeTypePen(None)
width, height = 500, 500
buf, size = pen.buffer(width=width, height=height)
self.assertEqual(b"\0" * size[0] * size[1], buf)
def test_bbox_and_cbox(self):
pen = FreeTypePen(None)
draw_cubic(pen)
self.assertEqual(pen.bbox, (50.0, 0.0, 450.0, 500.0))
self.assertEqual(pen.cbox, (50.0, 0.0, 450.0, 500.0))
def test_non_zero_fill(self):
pen = FreeTypePen(None)
star(pen)
t = Scale(0.05, 0.05)
width, height = t.transformPoint((1000, 1000))
t = t.translate(0, 200)
buf1, size1 = pen.buffer(width=width, height=height, transform=t, evenOdd=False)
buf2, size2 = load_pgm(os.path.join(DATA_DIR, "test_non_zero_fill.pgm"))
self.assertEqual(len(buf1), len(buf2))
self.assertEqual(size1, size2)
self.assertGreater(psnr(buf1, buf2), PSNR_THRESHOLD)
def test_even_odd_fill(self):
pen = FreeTypePen(None)
star(pen)
t = Scale(0.05, 0.05)
width, height = t.transformPoint((1000, 1000))
t = t.translate(0, 200)
buf1, size1 = pen.buffer(width=width, height=height, transform=t, evenOdd=True)
buf2, size2 = load_pgm(os.path.join(DATA_DIR, "test_even_odd_fill.pgm"))
self.assertEqual(len(buf1), len(buf2))
self.assertEqual(size1, size2)
self.assertGreater(psnr(buf1, buf2), PSNR_THRESHOLD)
def test_cubic_vs_quadratic(self):
pen1, pen2 = FreeTypePen(None), FreeTypePen(None)
draw_cubic(pen1)
draw_quadratic(pen2)
width, height = 500, 500
buf1, _ = pen1.buffer(width=width, height=height)
buf2, _ = pen2.buffer(width=width, height=height)
self.assertEqual(len(buf1), len(buf2))
self.assertGreater(psnr(buf1, buf2), PSNR_THRESHOLD)
def test_contain(self):
pen = FreeTypePen(None)
star(pen)
t = Scale(0.05, 0.05)
width, height = 0, 0
buf1, size1 = pen.buffer(width=width, height=height, transform=t, contain=True)
buf2, size2 = load_pgm(os.path.join(DATA_DIR, "test_non_zero_fill.pgm"))
self.assertEqual(len(buf1), len(buf2))
self.assertEqual(size1, size2)
self.assertGreater(psnr(buf1, buf2), PSNR_THRESHOLD)
def test_rotate(self):
pen = FreeTypePen(None)
box(pen)
t = Scale(0.05, 0.05).rotate(math.pi / 4.0).translate(1234, 5678)
width, height = None, None
buf1, size1 = pen.buffer(width=width, height=height, transform=t)
buf2, size2 = load_pgm(os.path.join(DATA_DIR, "test_rotate.pgm"))
self.assertEqual(len(buf1), len(buf2))
self.assertEqual(size1, size2)
self.assertGreater(psnr(buf1, buf2), PSNR_THRESHOLD)
def test_skew(self):
pen = FreeTypePen(None)
box(pen)
t = Scale(0.05, 0.05).skew(math.pi / 4.0).translate(1234, 5678)
width, height = None, None
buf1, size1 = pen.buffer(width=width, height=height, transform=t)
buf2, size2 = load_pgm(os.path.join(DATA_DIR, "test_skew.pgm"))
self.assertEqual(len(buf1), len(buf2))
self.assertEqual(size1, size2)
self.assertGreater(psnr(buf1, buf2), PSNR_THRESHOLD)
def test_none_size(self):
pen = FreeTypePen(None)
star(pen)
width, height = None, None
buf1, size = pen.buffer(width=width, height=height, transform=Offset(0, 200))
buf2, _ = pen.buffer(width=1000, height=1000, transform=Offset(0, 200))
self.assertEqual(size, (1000, 1000))
self.assertEqual(buf1, buf2)
pen = FreeTypePen(None)
box(pen, offset=(250, 250))
width, height = None, None
buf1, size = pen.buffer(width=width, height=height)
buf2, _ = pen.buffer(width=500, height=500, transform=Offset(-250, -250))
self.assertEqual(size, (500, 500))
self.assertEqual(buf1, buf2)
pen = FreeTypePen(None)
box(pen, offset=(-1234, -5678))
width, height = None, None
buf1, size = pen.buffer(width=width, height=height)
buf2, _ = pen.buffer(width=500, height=500, transform=Offset(1234, 5678))
self.assertEqual(size, (500, 500))
self.assertEqual(buf1, buf2)
def test_zero_size(self):
pen = FreeTypePen(None)
star(pen)
width, height = 0, 0
buf1, size = pen.buffer(
width=width, height=height, transform=Offset(0, 200), contain=True
)
buf2, _ = pen.buffer(
width=1000, height=1000, transform=Offset(0, 200), contain=True
)
self.assertEqual(size, (1000, 1000))
self.assertEqual(buf1, buf2)
pen = FreeTypePen(None)
box(pen, offset=(250, 250))
width, height = 0, 0
buf1, size = pen.buffer(width=width, height=height, contain=True)
buf2, _ = pen.buffer(
width=500, height=500, transform=Offset(0, 0), contain=True
)
self.assertEqual(size, (750, 750))
self.assertEqual(buf1, buf2)
pen = FreeTypePen(None)
box(pen, offset=(-1234, -5678))
width, height = 0, 0
buf1, size = pen.buffer(width=width, height=height, contain=True)
buf2, _ = pen.buffer(
width=500, height=500, transform=Offset(1234, 5678), contain=True
)
self.assertEqual(size, (500, 500))
self.assertEqual(buf1, buf2)
if __name__ == "__main__":
import sys
sys.exit(unittest.main())
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