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Inverted imshow using Cairo backend #7156
Description
In testing some stuff for #7151, I realized that the Cairo backend inverts images plotted using imshow.
import matplotlib as mpl
mpl.use('Cairo')
import numpy as np
import matplotlib.pyplot as plt
a = np.random.randn(3,3)
im1 = plt.imshow(a, extent = [0,1,0,1])
plt.xlim(0,2.2)
plt.ylim(0,2.2)
plt.savefig('test.png')It doesn't really matter if saving as png or pdf, the outcome is the same. With Agg, the image appears in the lower left corner:
With Cairo, the image appears in the upper left corner:
It worked correctly with mpl 1.4.3 and is broken with 1.5.0, but bisection is next to impossible because the Cairo backend was broken for a very long time.
Activity
QuLogic commentedon Oct 10, 2016
I'm going to ping @jenshnielsen who seems to have last had contact with the cairo backend.
tacaswell commentedon Oct 11, 2016
I can not reproduce this on 2.x with py3.5 and cairocffi
Please ping to have this re-opened if there is some combination of 2.x + py + cairo binding that fails.
QuLogic commentedon Oct 12, 2016
Oh, I thought I tested with v2.x at some point, but it looks like you're right. It appears to have been fixed with the ever-growing list of things from #5718.
tacaswell commentedon Oct 12, 2016
The dragon infested rabbit holes are paying for them selves in recovered technical debt.