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pyqtgraph/pyqtgraph/tests/image_testing.py

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# Image-based testing borrowed from vispy
"""
Procedure for unit-testing with images:
1. Run unit tests at least once; this initializes a git clone of
pyqtgraph/test-data in ~/.pyqtgraph.
2. Run individual test scripts with the PYQTGRAPH_AUDIT environment variable set:
$ PYQTGRAPH_AUDIT=1 python pyqtgraph/graphicsItems/tests/test_PlotCurveItem.py
Any failing tests will display the test results, standard image, and the
differences between the two. If the test result is bad, then press (f)ail.
If the test result is good, then press (p)ass and the new image will be
saved to the test-data directory.
To check all test results regardless of whether the test failed, set the
environment variable PYQTGRAPH_AUDIT_ALL=1.
3. After adding or changing test images, create a new commit:
$ cd ~/.pyqtgraph/test-data
$ git add ...
$ git commit -a
4. Look up the most recent tag name from the `testDataTag` global variable
below. Increment the tag name by 1 and create a new tag in the test-data
repository:
$ git tag test-data-NNN
$ git push --tags origin master
This tag is used to ensure that each pyqtgraph commit is linked to a specific
commit in the test-data repository. This makes it possible to push new
commits to the test-data repository without interfering with existing
tests, and also allows unit tests to continue working on older pyqtgraph
versions.
"""
# This is the name of a tag in the test-data repository that this version of
# pyqtgraph should be tested against. When adding or changing test images,
# create and push a new tag and update this variable. To test locally, begin
# by creating the tag in your ~/.pyqtgraph/test-data repository.
testDataTag = 'test-data-8'
import time
import os
import sys
import inspect
import base64
import subprocess as sp
import numpy as np
if sys.version[0] >= '3':
import http.client as httplib
import urllib.parse as urllib
else:
import httplib
import urllib
from ..Qt import QtGui, QtCore, QtTest, QT_LIB
from .. import functions as fn
from .. import GraphicsLayoutWidget
from .. import ImageItem, TextItem
tester = None
# Convenient stamp used for ensuring image orientation is correct
axisImg = [
" 1 1 1 ",
" 1 1 1 1 1 1 ",
" 1 1 1 1 1 1 1 1 1 1",
" 1 1 1 1 1 ",
" 1 1 1 1 1 1 ",
" 1 1 ",
" 1 1 ",
" 1 ",
" ",
" 1 ",
" 1 ",
" 1 ",
"1 1 1 1 1 ",
"1 1 1 1 1 ",
" 1 1 1 ",
" 1 1 1 ",
" 1 ",
" 1 ",
]
axisImg = np.array([map(int, row[::2].replace(' ', '0')) for row in axisImg])
def getTester():
global tester
if tester is None:
tester = ImageTester()
return tester
def assertImageApproved(image, standardFile, message=None, **kwargs):
"""Check that an image test result matches a pre-approved standard.
If the result does not match, then the user can optionally invoke a GUI
to compare the images and decide whether to fail the test or save the new
image as the standard.
This function will automatically clone the test-data repository into
~/.pyqtgraph/test-data. However, it is up to the user to ensure this repository
is kept up to date and to commit/push new images after they are saved.
Run the test with the environment variable PYQTGRAPH_AUDIT=1 to bring up
the auditing GUI.
Parameters
----------
image : (h, w, 4) ndarray
standardFile : str
The name of the approved test image to check against. This file name
is relative to the root of the pyqtgraph test-data repository and will
be automatically fetched.
message : str
A string description of the image. It is recommended to describe
specific features that an auditor should look for when deciding whether
to fail a test.
Extra keyword arguments are used to set the thresholds for automatic image
comparison (see ``assertImageMatch()``).
"""
if isinstance(image, QtGui.QWidget):
w = image
# just to be sure the widget size is correct (new window may be resized):
QtGui.QApplication.processEvents()
graphstate = scenegraphState(w, standardFile)
image = np.zeros((w.height(), w.width(), 4), dtype=np.ubyte)
qimg = fn.makeQImage(image, alpha=True, copy=False, transpose=False)
painter = QtGui.QPainter(qimg)
w.render(painter)
painter.end()
# transpose BGRA to RGBA
image = image[..., [2, 1, 0, 3]]
if message is None:
code = inspect.currentframe().f_back.f_code
message = "%s::%s" % (code.co_filename, code.co_name)
# Make sure we have a test data repo available, possibly invoking git
dataPath = getTestDataRepo()
# Read the standard image if it exists
stdFileName = os.path.join(dataPath, standardFile + '.png')
if not os.path.isfile(stdFileName):
stdImage = None
else:
pxm = QtGui.QPixmap()
pxm.load(stdFileName)
stdImage = fn.imageToArray(pxm.toImage(), copy=True, transpose=False)
# If the test image does not match, then we go to audit if requested.
try:
if stdImage is None:
raise Exception("No reference image saved for this test.")
if image.shape[2] != stdImage.shape[2]:
raise Exception("Test result has different channel count than standard image"
"(%d vs %d)" % (image.shape[2], stdImage.shape[2]))
if image.shape != stdImage.shape:
# Allow im1 to be an integer multiple larger than im2 to account
# for high-resolution displays
ims1 = np.array(image.shape).astype(float)
ims2 = np.array(stdImage.shape).astype(float)
sr = ims1 / ims2 if ims1[0] > ims2[0] else ims2 / ims1
if (sr[0] != sr[1] or not np.allclose(sr, np.round(sr)) or
sr[0] < 1):
raise TypeError("Test result shape %s is not an integer factor"
" different than standard image shape %s." %
(ims1, ims2))
sr = np.round(sr).astype(int)
image = fn.downsample(image, sr[0], axis=(0, 1)).astype(image.dtype)
assertImageMatch(image, stdImage, **kwargs)
if bool(os.getenv('PYQTGRAPH_PRINT_TEST_STATE', False)):
print(graphstate)
if os.getenv('PYQTGRAPH_AUDIT_ALL') == '1':
raise Exception("Image test passed, but auditing due to PYQTGRAPH_AUDIT_ALL evnironment variable.")
except Exception:
if stdFileName in gitStatus(dataPath):
print("\n\nWARNING: unit test failed against modified standard "
"image %s.\nTo revert this file, run `cd %s; git checkout "
"%s`\n" % (stdFileName, dataPath, standardFile))
if os.getenv('PYQTGRAPH_AUDIT') == '1' or os.getenv('PYQTGRAPH_AUDIT_ALL') == '1':
sys.excepthook(*sys.exc_info())
getTester().test(image, stdImage, message)
stdPath = os.path.dirname(stdFileName)
print('Saving new standard image to "%s"' % stdFileName)
if not os.path.isdir(stdPath):
os.makedirs(stdPath)
img = fn.makeQImage(image, alpha=True, transpose=False)
img.save(stdFileName)
else:
if stdImage is None:
raise Exception("Test standard %s does not exist. Set "
"PYQTGRAPH_AUDIT=1 to add this image." % stdFileName)
else:
if os.getenv('TRAVIS') is not None:
saveFailedTest(image, stdImage, standardFile, upload=True)
elif os.getenv('CI') is not None:
standardFile = os.path.join(os.getenv("SCREENSHOT_DIR", "screenshots"), standardFile)
saveFailedTest(image, stdImage, standardFile)
print(graphstate)
raise
def assertImageMatch(im1, im2, minCorr=None, pxThreshold=50.,
pxCount=-1, maxPxDiff=None, avgPxDiff=None,
imgDiff=None):
"""Check that two images match.
Images that differ in shape or dtype will fail unconditionally.
Further tests for similarity depend on the arguments supplied.
By default, images may have no pixels that gave a value difference greater
than 50.
Parameters
----------
im1 : (h, w, 4) ndarray
Test output image
im2 : (h, w, 4) ndarray
Test standard image
minCorr : float or None
Minimum allowed correlation coefficient between corresponding image
values (see numpy.corrcoef)
pxThreshold : float
Minimum value difference at which two pixels are considered different
pxCount : int or None
Maximum number of pixels that may differ. Default is 0 for Qt4 and
1% of image size for Qt5.
maxPxDiff : float or None
Maximum allowed difference between pixels
avgPxDiff : float or None
Average allowed difference between pixels
imgDiff : float or None
Maximum allowed summed difference between images
"""
assert im1.ndim == 3
assert im1.shape[2] == 4
assert im1.dtype == im2.dtype
if pxCount == -1:
if QT_LIB in {'PyQt5', 'PySide2', 'PySide6', 'PyQt6'}:
# Qt5 generates slightly different results; relax the tolerance
# until test images are updated.
pxCount = int(im1.shape[0] * im1.shape[1] * 0.01)
else:
pxCount = 0
diff = im1.astype(float) - im2.astype(float)
if imgDiff is not None:
assert np.abs(diff).sum() <= imgDiff
pxdiff = diff.max(axis=2) # largest value difference per pixel
mask = np.abs(pxdiff) >= pxThreshold
if pxCount is not None:
assert mask.sum() <= pxCount
maskedDiff = diff[mask]
if maxPxDiff is not None and maskedDiff.size > 0:
assert maskedDiff.max() <= maxPxDiff
if avgPxDiff is not None and maskedDiff.size > 0:
assert maskedDiff.mean() <= avgPxDiff
if minCorr is not None:
with np.errstate(invalid='ignore'):
corr = np.corrcoef(im1.ravel(), im2.ravel())[0, 1]
assert corr >= minCorr
def saveFailedTest(data, expect, filename, upload=False):
"""Upload failed test images to web server to allow CI test debugging.
"""
# concatenate data, expect, and diff into a single image
ds = data.shape
es = expect.shape
shape = (max(ds[0], es[0]) + 4, ds[1] + es[1] + 8 + max(ds[1], es[1]), 4)
img = np.empty(shape, dtype=np.ubyte)
img[..., :3] = 100
img[..., 3] = 255
img[2:2+ds[0], 2:2+ds[1], :ds[2]] = data
img[2:2+es[0], ds[1]+4:ds[1]+4+es[1], :es[2]] = expect
diff = makeDiffImage(data, expect)
img[2:2+diff.shape[0], -diff.shape[1]-2:-2] = diff
png = makePng(img)
directory = os.path.dirname(filename)
if not os.path.isdir(directory):
os.makedirs(directory)
with open(filename + ".png", "wb") as png_file:
png_file.write(png)
print("\nImage comparison failed. Test result: %s %s Expected result: "
"%s %s" % (data.shape, data.dtype, expect.shape, expect.dtype))
if upload:
uploadFailedTest(filename, png)
def uploadFailedTest(filename, png):
commit = runSubprocess(['git', 'rev-parse', 'HEAD'])
name = filename.split(os.path.sep)
name.insert(-1, commit.strip())
filename = os.path.sep.join(name)
host = 'data.pyqtgraph.org'
conn = httplib.HTTPConnection(host)
req = urllib.urlencode({'name': filename,
'data': base64.b64encode(png)})
conn.request('POST', '/upload.py', req)
response = conn.getresponse().read()
conn.close()
print("Uploaded to: \nhttp://%s/data/%s" % (host, filename))
if not response.startswith(b'OK'):
print("WARNING: Error uploading data to %s" % host)
print(response)
def makePng(img):
"""Given an array like (H, W, 4), return a PNG-encoded byte string.
"""
io = QtCore.QBuffer()
qim = fn.makeQImage(img.transpose(1, 0, 2), alpha=False)
qim.save(io, 'PNG')
png = bytes(io.data().data())
return png
def makeDiffImage(im1, im2):
"""Return image array showing the differences between im1 and im2.
Handles images of different shape. Alpha channels are not compared.
"""
ds = im1.shape
es = im2.shape
diff = np.empty((max(ds[0], es[0]), max(ds[1], es[1]), 4), dtype=int)
diff[..., :3] = 128
diff[..., 3] = 255
diff[:ds[0], :ds[1], :min(ds[2], 3)] += im1[..., :3]
diff[:es[0], :es[1], :min(es[2], 3)] -= im2[..., :3]
diff = np.clip(diff, 0, 255).astype(np.ubyte)
return diff
class ImageTester(QtGui.QWidget):
"""Graphical interface for auditing image comparison tests.
"""
def __init__(self):
self.lastKey = None
QtGui.QWidget.__init__(self)
self.resize(1200, 800)
#self.showFullScreen()
self.layout = QtGui.QGridLayout()
self.setLayout(self.layout)
self.view = GraphicsLayoutWidget()
self.layout.addWidget(self.view, 0, 0, 1, 2)
self.label = QtGui.QLabel()
self.layout.addWidget(self.label, 1, 0, 1, 2)
self.label.setWordWrap(True)
font = QtGui.QFont("monospace", 14, QtGui.QFont.Bold)
self.label.setFont(font)
self.passBtn = QtGui.QPushButton('Pass')
self.failBtn = QtGui.QPushButton('Fail')
self.layout.addWidget(self.passBtn, 2, 0)
self.layout.addWidget(self.failBtn, 2, 1)
self.passBtn.clicked.connect(self.passTest)
self.failBtn.clicked.connect(self.failTest)
self.views = (self.view.addViewBox(row=0, col=0),
self.view.addViewBox(row=0, col=1),
self.view.addViewBox(row=0, col=2))
labelText = ['test output', 'standard', 'diff']
for i, v in enumerate(self.views):
v.setAspectLocked(1)
v.invertY()
v.image = ImageItem(axisOrder='row-major')
v.image.setAutoDownsample(True)
v.addItem(v.image)
v.label = TextItem(labelText[i])
v.setBackgroundColor(0.5)
self.views[1].setXLink(self.views[0])
self.views[1].setYLink(self.views[0])
self.views[2].setXLink(self.views[0])
self.views[2].setYLink(self.views[0])
def test(self, im1, im2, message):
"""Ask the user to decide whether an image test passes or fails.
This method displays the test image, reference image, and the difference
between the two. It then blocks until the user selects the test output
by clicking a pass/fail button or typing p/f. If the user fails the test,
then an exception is raised.
"""
self.show()
if im2 is None:
message += '\nImage1: %s %s Image2: [no standard]' % (im1.shape, im1.dtype)
im2 = np.zeros((1, 1, 3), dtype=np.ubyte)
else:
message += '\nImage1: %s %s Image2: %s %s' % (im1.shape, im1.dtype, im2.shape, im2.dtype)
self.label.setText(message)
self.views[0].image.setImage(im1)
self.views[1].image.setImage(im2)
diff = makeDiffImage(im1, im2)
self.views[2].image.setImage(diff)
self.views[0].autoRange()
while True:
QtGui.QApplication.processEvents()
lastKey = self.lastKey
self.lastKey = None
if lastKey in ('f', 'esc') or not self.isVisible():
raise Exception("User rejected test result.")
elif lastKey == 'p':
break
time.sleep(0.03)
for v in self.views:
v.image.setImage(np.zeros((1, 1, 3), dtype=np.ubyte))
def keyPressEvent(self, event):
if event.key() == QtCore.Qt.Key_Escape:
self.lastKey = 'esc'
else:
self.lastKey = str(event.text()).lower()
def passTest(self):
self.lastKey = 'p'
def failTest(self):
self.lastKey = 'f'
def getTestDataRepo():
"""Return the path to a git repository with the required commit checked
out.
If the repository does not exist, then it is cloned from
https://github.com/pyqtgraph/test-data. If the repository already exists
then the required commit is checked out.
"""
global testDataTag
if os.getenv("CI"):
dataPath = os.path.join(os.environ["GITHUB_WORKSPACE"], '.pyqtgraph', 'test-data')
else:
dataPath = os.path.join(os.path.expanduser('~'), '.pyqtgraph', 'test-data')
gitPath = 'https://github.com/pyqtgraph/test-data'
gitbase = gitCmdBase(dataPath)
if os.path.isdir(dataPath):
# Already have a test-data repository to work with.
# Get the commit ID of testDataTag. Do a fetch if necessary.
try:
tagCommit = gitCommitId(dataPath, testDataTag)
except NameError:
cmd = gitbase + ['fetch', '--tags', 'origin']
print(' '.join(cmd))
sp.check_call(cmd)
try:
tagCommit = gitCommitId(dataPath, testDataTag)
except NameError:
raise Exception("Could not find tag '%s' in test-data repo at"
" %s" % (testDataTag, dataPath))
except Exception:
if not os.path.exists(os.path.join(dataPath, '.git')):
raise Exception("Directory '%s' does not appear to be a git "
"repository. Please remove this directory." %
dataPath)
else:
raise
# If HEAD is not the correct commit, then do a checkout
if gitCommitId(dataPath, 'HEAD') != tagCommit:
print("Checking out test-data tag '%s'" % testDataTag)
sp.check_call(gitbase + ['checkout', testDataTag])
else:
print("Attempting to create git clone of test data repo in %s.." %
dataPath)
parentPath = os.path.split(dataPath)[0]
if not os.path.isdir(parentPath):
os.makedirs(parentPath)
if os.getenv('TRAVIS') is not None or os.getenv('CI') is not None:
# Create a shallow clone of the test-data repository (to avoid
# downloading more data than is necessary)
os.makedirs(dataPath)
cmds = [
gitbase + ['init'],
gitbase + ['remote', 'add', 'origin', gitPath],
gitbase + ['fetch', '--tags', 'origin', testDataTag,
'--depth=1'],
gitbase + ['checkout', '-b', 'master', 'FETCH_HEAD'],
]
else:
# Create a full clone
cmds = [['git', 'clone', gitPath, dataPath]]
for cmd in cmds:
print(' '.join(cmd))
rval = sp.check_call(cmd)
if rval == 0:
continue
raise RuntimeError("Test data path '%s' does not exist and could "
"not be created with git. Please create a git "
"clone of %s at this path." %
(dataPath, gitPath))
return dataPath
def gitCmdBase(path):
return ['git', '--git-dir=%s/.git' % path, '--work-tree=%s' % path]
def gitStatus(path):
"""Return a string listing all changes to the working tree in a git
repository.
"""
cmd = gitCmdBase(path) + ['status', '--porcelain']
return runSubprocess(cmd, stderr=None, universal_newlines=True)
def gitCommitId(path, ref):
"""Return the commit id of *ref* in the git repository at *path*.
"""
cmd = gitCmdBase(path) + ['show', ref]
try:
output = runSubprocess(cmd, stderr=None, universal_newlines=True)
except sp.CalledProcessError:
print(cmd)
raise NameError("Unknown git reference '%s'" % ref)
commit = output.split('\n')[0]
assert commit[:7] == 'commit '
return commit[7:]
def runSubprocess(command, return_code=False, **kwargs):
"""Run command using subprocess.Popen
Similar to subprocess.check_output(), which is not available in 2.6.
Run command and wait for command to complete. If the return code was zero
then return, otherwise raise CalledProcessError.
By default, this will also add stdout= and stderr=subproces.PIPE
to the call to Popen to suppress printing to the terminal.
Parameters
----------
command : list of str
Command to run as subprocess (see subprocess.Popen documentation).
**kwargs : dict
Additional kwargs to pass to ``subprocess.Popen``.
Returns
-------
stdout : str
Stdout returned by the process.
"""
# code adapted with permission from mne-python
use_kwargs = dict(stderr=None, stdout=sp.PIPE)
use_kwargs.update(kwargs)
p = sp.Popen(command, **use_kwargs)
output = p.communicate()[0]
# communicate() may return bytes, str, or None depending on the kwargs
# passed to Popen(). Convert all to unicode str:
output = '' if output is None else output
output = output.decode('utf-8') if isinstance(output, bytes) else output
if p.returncode != 0:
print(output)
err_fun = sp.CalledProcessError.__init__
if 'output' in inspect.getargspec(err_fun).args:
raise sp.CalledProcessError(p.returncode, command, output)
else:
raise sp.CalledProcessError(p.returncode, command)
return output
def scenegraphState(view, name):
"""Return information about the scenegraph for debugging test failures.
"""
state = "====== Scenegraph state for %s ======\n" % name
state += "view size: %dx%d\n" % (view.width(), view.height())
state += "view transform:\n" + indent(transformStr(view.transform()), " ")
for item in view.scene().items():
if item.parentItem() is None:
state += itemState(item) + '\n'
return state
def itemState(root):
state = str(root) + '\n'
from .. import ViewBox
state += 'bounding rect: ' + str(root.boundingRect()) + '\n'
if isinstance(root, ViewBox):
state += "view range: " + str(root.viewRange()) + '\n'
state += "transform:\n" + indent(transformStr(root.transform()).strip(), " ") + '\n'
for item in root.childItems():
state += indent(itemState(item).strip(), " ") + '\n'
return state
def transformStr(t):
return ("[%0.2f %0.2f %0.2f]\n"*3) % (t.m11(), t.m12(), t.m13(), t.m21(), t.m22(), t.m23(), t.m31(), t.m32(), t.m33())
def indent(s, pfx):
return '\n'.join([pfx+line for line in s.split('\n')])
class TransposedImageItem(ImageItem):
# used for testing image axis order; we can test row-major and col-major using
# the same test images
def __init__(self, *args, **kwds):
self.__transpose = kwds.pop('transpose', False)
ImageItem.__init__(self, *args, **kwds)
def setImage(self, image=None, **kwds):
if image is not None and self.__transpose is True:
image = np.swapaxes(image, 0, 1)
return ImageItem.setImage(self, image, **kwds)
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