"""

base, ext = os.path.splitext(fname)

md5 = hashlib.md5()

with open(path, 'rb') as fd:

while True:

data = fd.read(block_size)

if not data:

break

md5.update(data)

if Path(path).suffix == '.pdf':

md5.update(str(mpl._get_executable_info("gs").version)

.encode('utf-8'))

elif Path(path).suffix == '.svg':

md5.update(str(mpl._get_executable_info("inkscape").version)

.encode('utf-8'))

def __init__(self):

self._proc = None

# Explicitly register deletion from an atexit handler because if we

# wait until the object is GC'd (which occurs later), then some module

# globals (e.g. signal.SIGKILL) has already been set to None, and

# kill() doesn't work anymore...

atexit.register(self.__del__)

def __del__(self):

if self._proc:

self._proc.kill()

self._proc.wait()

for stream in filter(None, [self._proc.stdin,

self._proc.stdout,

self._proc.stderr]):

stream.close()

self._proc = None

def _read_until(self, terminator):

"""Read until the prompt is reached."""

buf = bytearray()

while True:

c = self._proc.stdout.read(1)

if not c:

raise _ConverterError(os.fsdecode(bytes(buf)))

buf.extend(c)

if buf.endswith(terminator):

def __call__(self, orig, dest):

if not self._proc:

self._proc = subprocess.Popen(

[mpl._get_executable_info("gs").executable,

"-dNOSAFER", "-dNOPAUSE", "-dEPSCrop", "-sDEVICE=png16m"],

# As far as I can see, ghostscript never outputs to stderr.

stdin=subprocess.PIPE, stdout=subprocess.PIPE)

try:

self._read_until(b"\nGS")

except _ConverterError as err:

raise OSError(

"Failed to start Ghostscript:\n\n" + err.args[0]) from None

def encode_and_escape(name):

return (os.fsencode(name)

.replace(b"\\", b"\\\\")

.replace(b"(", br"\(")

.replace(b")", br"\)"))

self._proc.stdin.write(

b"<< /OutputFile ("

+ encode_and_escape(dest)

+ b") >> setpagedevice ("

+ encode_and_escape(orig)

+ b") run flush\n")

self._proc.stdin.flush()

# GS> if nothing left on the stack; GS<n> if n items left on the stack.

err = self._read_until((b"GS<", b"GS>"))

stack = self._read_until(b">") if err.endswith(b"GS<") else b""

if stack or not os.path.exists(dest):

stack_size = int(stack[:-1]) if stack else 0

self._proc.stdin.write(b"pop\n" * stack_size)

# Using the systemencoding should at least get the filenames right.

raise ImageComparisonFailure(

def __call__(self, orig, dest):

old_inkscape = mpl._get_executable_info("inkscape").version.major < 1

terminator = b"\n>" if old_inkscape else b"> "

if not hasattr(self, "_tmpdir"):

self._tmpdir = TemporaryDirectory()

# On Windows, we must make sure that self._proc has terminated

# (which __del__ does) before clearing _tmpdir.

weakref.finalize(self._tmpdir, self.__del__)

if (not self._proc # First run.

or self._proc.poll() is not None): # Inkscape terminated.

if self._proc is not None and self._proc.poll() is not None:

for stream in filter(None, [self._proc.stdin,

self._proc.stdout,

self._proc.stderr]):

stream.close()

env = {

**os.environ,

# If one passes e.g. a png file to Inkscape, it will try to

# query the user for conversion options via a GUI (even with

# `--without-gui`). Unsetting `DISPLAY` prevents this (and

# causes GTK to crash and Inkscape to terminate, but that'll

# just be reported as a regular exception below).

"DISPLAY": "",

# Do not load any user options.

"INKSCAPE_PROFILE_DIR": self._tmpdir.name,

}

# Old versions of Inkscape (e.g. 0.48.3.1) seem to sometimes

# deadlock when stderr is redirected to a pipe, so we redirect it

# to a temporary file instead. This is not necessary anymore as of

# Inkscape 0.92.1.

stderr = TemporaryFile()

self._proc = subprocess.Popen(

["inkscape", "--without-gui", "--shell"] if old_inkscape else

["inkscape", "--shell"],

stdin=subprocess.PIPE, stdout=subprocess.PIPE, stderr=stderr,

env=env, cwd=self._tmpdir.name)

# Slight abuse, but makes shutdown handling easier.

self._proc.stderr = stderr

try:

self._read_until(terminator)

except _ConverterError as err:

raise OSError(

"Failed to start Inkscape in interactive mode:\n\n"

+ err.args[0]) from err

# Inkscape's shell mode does not support escaping metacharacters in the

# filename ("\n", and ":;" for inkscape>=1). Avoid any problems by

# running from a temporary directory and using fixed filenames.

inkscape_orig = Path(self._tmpdir.name, os.fsdecode(b"f.svg"))

inkscape_dest = Path(self._tmpdir.name, os.fsdecode(b"f.png"))

try:

inkscape_orig.symlink_to(Path(orig).resolve())

except OSError:

shutil.copyfile(orig, inkscape_orig)

self._proc.stdin.write(

b"f.svg --export-png=f.png\n" if old_inkscape else

b"file-open:f.svg;export-filename:f.png;export-do;file-close\n")

self._proc.stdin.flush()

try:

self._read_until(terminator)

except _ConverterError as err:

# Inkscape's output is not localized but gtk's is, so the output

# stream probably has a mixed encoding. Using the filesystem

# encoding should at least get the filenames right...

self._proc.stderr.seek(0)

raise ImageComparisonFailure(

self._proc.stderr.read().decode(

sys.getfilesystemencoding(), "replace")) from err

os.remove(inkscape_orig)

shutil.move(inkscape_dest, dest)

def __del__(self):

super().__del__()

if hasattr(self, "_tmpdir"):

"""

def __call__(self, orig, dest):

if not hasattr(self, "_tmpdir"):

self._tmpdir = TemporaryDirectory()

shutil.copytree(cbook._get_data_path("fonts/ttf"),

Path(self._tmpdir.name, "fonts"))

try:

mpl._get_executable_info("gs")

except mpl.ExecutableNotFoundError:

pass

else:

converter['pdf'] = converter['eps'] = _GSConverter()

try:

mpl._get_executable_info("inkscape")

except mpl.ExecutableNotFoundError:

pass

else:

"""

"""

path = Path(filename)

if not path.exists():

raise OSError(f"{path} does not exist")

if path.suffix[1:] not in converter:

import pytest

pytest.skip(f"Don't know how to convert {path.suffix} files to png")

newpath = path.parent / f"{path.stem}_{path.suffix[1:]}.png"

# Only convert the file if the destination doesn't already exist or

# is out of date.

if not newpath.exists() or newpath.stat().st_mtime < path.stat().st_mtime:

cache_dir = _get_cache_path() if cache else None

if cache_dir is not None:

_register_conversion_cache_cleaner_once()

hash_value = get_file_hash(path)

cached_path = cache_dir / (hash_value + newpath.suffix)

if cached_path.exists():

_log.debug("For %s: reusing cached conversion.", filename)

shutil.copyfile(cached_path, newpath)

return str(newpath)

_log.debug("For %s: converting to png.", filename)

convert = converter[path.suffix[1:]]

if path.suffix == ".svg":

contents = path.read_text()

if 'style="font:' in contents:

# for svg.fonttype = none, we explicitly patch the font search

# path so that fonts shipped by Matplotlib are found.

convert = _svg_with_matplotlib_fonts_converter

convert(path, newpath)

if cache_dir is not None:

_log.debug("For %s: caching conversion result.", filename)

shutil.copyfile(newpath, cached_path)

# This will actually ignore mpl_toolkits baseline images, but they're

# relatively small.

baseline_images_size = sum(

path.stat().st_size

for path in Path(mpl.__file__).parent.glob("**/baseline_images/**/*"))

# 2x: one full copy of baselines, and one full copy of test results

# (actually an overestimate: we don't convert png baselines and results).

max_cache_size = 2 * baseline_images_size

# Reduce cache until it fits.

with cbook._lock_path(_get_cache_path()):

cache_stat = {

path: path.stat() for path in _get_cache_path().glob("*")}

cache_size = sum(stat.st_size for stat in cache_stat.values())

paths_by_atime = sorted( # Oldest at the end.

cache_stat, key=lambda path: cache_stat[path].st_atime,

reverse=True)

while cache_size > max_cache_size:

path = paths_by_atime.pop()

cache_size -= cache_stat[path].st_size

# clip the images to the same size -- this is useful only when

# comparing eps to pdf

if actual_path[-7:-4] == 'eps' and expected_path[-7:-4] == 'pdf':

aw, ah, ad = actual_image.shape

ew, eh, ed = expected_image.shape

actual_image = actual_image[int(aw / 2 - ew / 2):int(

aw / 2 + ew / 2), int(ah / 2 - eh / 2):int(ah / 2 + eh / 2)]

"""

if expected_image.shape != actual_image.shape:

raise ImageComparisonFailure(

f"Image sizes do not match expected size: {expected_image.shape} "

f"actual size {actual_image.shape}")

# Convert to float to avoid overflowing finite integer types.

img = Image.open(path)

# In an RGBA image, if the smallest value in the alpha channel is 255, all

# values in it must be 255, meaning that the image is opaque. If so,

# discard the alpha channel so that it may compare equal to an RGB image.

if img.mode != "RGBA" or img.getextrema()[3][0] == 255:

img = img.convert("RGB")

"""

actual = os.fspath(actual)

if not os.path.exists(actual):

raise Exception(f"Output image {actual} does not exist.")

if os.stat(actual).st_size == 0:

raise Exception(f"Output image file {actual} is empty.")

# Convert the image to png

expected = os.fspath(expected)

if not os.path.exists(expected):

raise OSError(f'Baseline image {expected!r} does not exist.')

extension = expected.split('.')[-1]

if extension != 'png':

actual = convert(actual, cache=True)

expected = convert(expected, cache=True)

# open the image files

expected_image = _load_image(expected)

actual_image = _load_image(actual)

actual_image, expected_image = crop_to_same(

actual, actual_image, expected, expected_image)

diff_image = make_test_filename(actual, 'failed-diff')

if tol <= 0:

if np.array_equal(expected_image, actual_image):

return None

# convert to signed integers, so that the images can be subtracted without

# overflow

expected_image = expected_image.astype(np.int16)

actual_image = actual_image.astype(np.int16)

rms = calculate_rms(expected_image, actual_image)

if rms <= tol:

return None

save_diff_image(expected, actual, diff_image)

results = dict(rms=rms, expected=str(expected),

actual=str(actual), diff=str(diff_image), tol=tol)

if not in_decorator:

# Then the results should be a string suitable for stdout.

template = ['Error: Image files did not match.',

'RMS Value: {rms}',

'Expected: \n {expected}',

'Actual: \n {actual}',

'Difference:\n {diff}',

'Tolerance: \n {tol}', ]

results = '\n '.join([line.format(**results) for line in template])

"""

expected_image = _load_image(expected)

actual_image = _load_image(actual)

actual_image, expected_image = crop_to_same(

actual, actual_image, expected, expected_image)

expected_image = np.array(expected_image, float)

actual_image = np.array(actual_image, float)

if expected_image.shape != actual_image.shape:

raise ImageComparisonFailure(

f"Image sizes do not match expected size: {expected_image.shape} "

f"actual size {actual_image.shape}")

abs_diff = np.abs(expected_image - actual_image)

# expand differences in luminance domain

abs_diff *= 10

abs_diff = np.clip(abs_diff, 0, 255).astype(np.uint8)

if abs_diff.shape[2] == 4: # Hard-code the alpha channel to fully solid

abs_diff[:, :, 3] = 255