def test_blit(): # pragma: no cover
import matplotlib.pyplot as plt
import numpy as np
import matplotlib.backends.backend_tkagg # noqa
from matplotlib.backends import _tkagg
fig, ax = plt.subplots()
photoimage = fig.canvas._tkphoto
data = np.ones((4, 4, 4))
height, width = data.shape[:2]
dataptr = (height, width, data.ctypes.data)
# Test out of bounds blitting.
bad_boxes = ((-1, 2, 0, 2),
(2, 0, 0, 2),
(1, 6, 0, 2),
(0, 2, -1, 2),
(0, 2, 2, 0),
(0, 2, 1, 6))
for bad_box in bad_boxes:
try:
_tkagg.blit(
photoimage.tk.interpaddr(), str(photoimage), dataptr, 0,
(0, 1, 2, 3), bad_box)
except ValueError:
print("success")
def evil_blit(photoimage, aggimage, offsets, bboxptr):
data = np.asarray(aggimage)
height, width = data.shape[:2]
dataptr = (height, width, data.ctypes.data)
_tkagg.blit(photoimage.tk.interpaddr(), str(photoimage), dataptr,
offsets, bboxptr)
