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Update some image_comparison tests.#10335

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14 changes: 7 additions & 7 deletionslib/matplotlib/tests/test_backend_pgf.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -11,7 +11,7 @@
import matplotlib.pyplot as plt
from matplotlib.compat import subprocess
from matplotlib.testing.compare import compare_images, ImageComparisonFailure
from matplotlib.testing.decorators import _image_directories
from matplotlib.testing.decorators importimage_comparison,_image_directories

baseline_dir, result_dir = _image_directories(lambda: 'dummy func')

Expand DownExpand Up@@ -81,20 +81,21 @@ def create_figure():

# test compiling a figure to pdf with xelatex
@needs_xelatex
@pytest.mark.style('default')
@pytest.mark.backend('pgf')
@image_comparison(baseline_images=['pgf_xelatex'], extensions=['pdf'],
style='default')
def test_xelatex():
rc_xelatex = {'font.family': 'serif',
'pgf.rcfonts': False}
mpl.rcParams.update(rc_xelatex)
create_figure()
compare_figure('pgf_xelatex.pdf', tol=0)


# test compiling a figure to pdf with pdflatex
@needs_pdflatex
@pytest.mark.style('default')
@pytest.mark.backend('pgf')
@image_comparison(baseline_images=['pgf_pdflatex'], extensions=['pdf'],
style='default')
def test_pdflatex():
import os
if os.environ.get('APPVEYOR', False):
Expand All@@ -108,7 +109,6 @@ def test_pdflatex():
'\\usepackage[T1]{fontenc}']}
mpl.rcParams.update(rc_pdflatex)
create_figure()
compare_figure('pgf_pdflatex.pdf', tol=0)


# test updating the rc parameters for each figure
Expand DownExpand Up@@ -162,8 +162,9 @@ def test_pathclip():

# test mixed mode rendering
@needs_xelatex
@pytest.mark.style('default')
@pytest.mark.backend('pgf')
@image_comparison(baseline_images=['pgf_mixedmode'], extensions=['pdf'],
style='default')
def test_mixedmode():
rc_xelatex = {'font.family': 'serif',
'pgf.rcfonts': False}
Expand All@@ -172,7 +173,6 @@ def test_mixedmode():
Y, X = np.ogrid[-1:1:40j, -1:1:40j]
plt.figure()
plt.pcolor(X**2 + Y**2).set_rasterized(True)
compare_figure('pgf_mixedmode.pdf', tol=0)


# test bbox_inches clipping
Expand Down
99 changes: 37 additions & 62 deletionslib/matplotlib/tests/test_compare_images.py
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Original file line numberDiff line numberDiff line change
Expand Up@@ -9,6 +9,7 @@

from numpy.testing import assert_almost_equal
import pytest
from pytest import approx

from matplotlib.testing.compare import compare_images
from matplotlib.testing.decorators import _image_directories, image_comparison
Expand All@@ -19,7 +20,40 @@


# Tests of the image comparison algorithm.
def image_comparison_expect_rms(im1, im2, tol, expect_rms):
@pytest.mark.parametrize(
'im1, im2, tol, expect_rms',
[
# Comparison of an image and the same image with minor differences.
# This expects the images to compare equal under normal tolerance, and
# have a small RMS.
('basn3p02.png', 'basn3p02-minorchange.png', 10, None),
# Now test with no tolerance.
('basn3p02.png', 'basn3p02-minorchange.png', 0, 6.50646),
# Comparison with an image that is shifted by 1px in the X axis.
('basn3p02.png', 'basn3p02-1px-offset.png', 0, 90.15611),
# Comparison with an image with half the pixels shifted by 1px in the X
# axis.
('basn3p02.png', 'basn3p02-half-1px-offset.png', 0, 63.75),
# Comparison of an image and the same image scrambled.
# This expects the images to compare completely different, with a very
# large RMS.
# Note: The image has been scrambled in a specific way, by having
# each color component of each pixel randomly placed somewhere in the
# image. It contains exactly the same number of pixels of each color
# value of R, G and B, but in a totally different position.
# Test with no tolerance to make sure that we pick up even a very small
# RMS error.
('basn3p02.png', 'basn3p02-scrambled.png', 0, 172.63582),
# Comparison of an image and a slightly brighter image.
# The two images are solid color, with the second image being exactly 1
# color value brighter.
# This expects the images to compare equal under normal tolerance, and
# have an RMS of exactly 1.
('all127.png', 'all128.png', 0, 1),
# Now test the reverse comparison.
('all128.png', 'all127.png', 0, 1),
])
def test_image_comparison_expect_rms(im1, im2, tol, expect_rms):
"""Compare two images, expecting a particular RMS error.

im1 and im2 are filenames relative to the baseline_dir directory.
Expand All@@ -43,72 +77,13 @@ def image_comparison_expect_rms(im1, im2, tol, expect_rms):
assert results is None
else:
assert results is not None
assert_almost_equal(expect_rms, results['rms'], decimal=4)


def test_image_compare_basic():
#: Test comparison of an image and the same image with minor differences.

# This expects the images to compare equal under normal tolerance, and have
# a small RMS.
im1 = 'basn3p02.png'
im2 = 'basn3p02-minorchange.png'
image_comparison_expect_rms(im1, im2, tol=10, expect_rms=None)

# Now test with no tolerance.
image_comparison_expect_rms(im1, im2, tol=0, expect_rms=6.50646)


def test_image_compare_1px_offset():
#: Test comparison with an image that is shifted by 1px in the X axis.
im1 = 'basn3p02.png'
im2 = 'basn3p02-1px-offset.png'
image_comparison_expect_rms(im1, im2, tol=0, expect_rms=90.15611)
assert results['rms'] == approx(expect_rms, abs=1e-4)


def test_image_compare_half_1px_offset():
#: Test comparison with an image with half the pixels shifted by 1px in
#: the X axis.
im1 = 'basn3p02.png'
im2 = 'basn3p02-half-1px-offset.png'
image_comparison_expect_rms(im1, im2, tol=0, expect_rms=63.75)


def test_image_compare_scrambled():
#: Test comparison of an image and the same image scrambled.

# This expects the images to compare completely different, with a very
# large RMS.
# Note: The image has been scrambled in a specific way, by having each
# color component of each pixel randomly placed somewhere in the image. It
# contains exactly the same number of pixels of each color value of R, G
# and B, but in a totally different position.
im1 = 'basn3p02.png'
im2 = 'basn3p02-scrambled.png'
# Test with no tolerance to make sure that we pick up even a very small RMS
# error.
image_comparison_expect_rms(im1, im2, tol=0, expect_rms=172.63582)


def test_image_compare_shade_difference():
#: Test comparison of an image and a slightly brighter image.
# The two images are solid color, with the second image being exactly 1
# color value brighter.
# This expects the images to compare equal under normal tolerance, and have
# an RMS of exactly 1.
im1 = 'all127.png'
im2 = 'all128.png'
image_comparison_expect_rms(im1, im2, tol=0, expect_rms=1.0)

# Now test the reverse comparison.
image_comparison_expect_rms(im2, im1, tol=0, expect_rms=1.0)


#
# The following tests are used by test_nose_image_comparison to ensure that the
# image_comparison decorator continues to work with nose. They should not be
# prefixed by test_ so they don't run with pytest.
#


def nosetest_empty():
pass
Expand Down
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