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#!/usr/bin/env python
# Copyright (C) 2010 Google Inc. All rights reserved.
# Copyright (C) 2010 Gabor Rapcsanyi <rgabor@inf.u-szeged.hu>, University of Szeged
# Copyright (C) 2011, 2012 Apple Inc. All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions are
# met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
# * Neither the Google name nor the names of its
# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
"""WebKit implementations of the Port interface."""
import logging
import re
import time
from webkitpy.layout_tests.port import server_process
_log = logging.getLogger(__name__)
class ImageDiffer(object):
def __init__(self, port):
self._port = port
self._tolerance = None
self._process = None
def diff_image(self, expected_contents, actual_contents, tolerance):
if tolerance != self._tolerance:
self.stop()
try:
assert(expected_contents)
assert(actual_contents)
assert(tolerance is not None)
if not self._process:
self._start(tolerance)
self._process.write('Content-Length: %d\n%sContent-Length: %d\n%s' % (
len(actual_contents), actual_contents,
len(expected_contents), expected_contents))
return self._read()
except IOError as exception:
_log.error("Failed to compute an image diff: %s" % str(exception))
return (True, 0)
def _start(self, tolerance):
command = [self._port._path_to_image_diff(), '--tolerance', str(tolerance)]
environment = self._port.setup_environ_for_server('ImageDiff')
self._process = self._port._server_process_constructor(self._port, 'ImageDiff', command, environment)
self._process.start()
self._tolerance = tolerance
def _read(self):
deadline = time.time() + 2.0
output = None
output_image = ""
while True:
output = self._process.read_stdout_line(deadline)
if self._process.timed_out or self._process.has_crashed() or not output:
break
if output.startswith('diff'): # This is the last line ImageDiff prints.
break
if output.startswith('Content-Length'):
m = re.match('Content-Length: (\d+)', output)
content_length = int(m.group(1))
output_image = self._process.read_stdout(deadline, content_length)
output = self._process.read_stdout_line(deadline)
break
stderr = self._process.pop_all_buffered_stderr()
if stderr:
_log.warn("ImageDiff produced stderr output:\n" + stderr)
if self._process.timed_out:
_log.error("ImageDiff timed out")
if self._process.has_crashed():
_log.error("ImageDiff crashed")
# FIXME: There is no need to shut down the ImageDiff server after every diff.
self._process.stop()
diff_percent = 0
if output and output.startswith('diff'):
m = re.match('diff: (.+)% (passed|failed)', output)
if m.group(2) == 'passed':
return [None, 0]
diff_percent = float(m.group(1))
return (output_image, diff_percent)
def stop(self):
if self._process:
self._process.stop()
self._process = None
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