| # 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.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 or (self._process and self._process.has_available_stdout()): |
| self.stop() |
| try: |
| assert(expected_contents) |
| assert(actual_contents) |
| assert(tolerance is not None) |
| |
| if not self._process: |
| self._start(tolerance) |
| # Note that although we are handed 'old', 'new', ImageDiff wants 'new', 'old'. |
| 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: |
| return (None, 0, "Failed to compute an image diff: %s" % str(exception)) |
| |
| def _start(self, tolerance): |
| command = [self._port._path_to_image_diff(), '--tolerance', str(tolerance)] |
| if self._port._should_use_jhbuild(): |
| command = self._port._jhbuild_wrapper + command |
| 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 not self._process.timed_out and not self._process.has_crashed(): |
| 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() |
| err_str = '' |
| if stderr: |
| err_str += "ImageDiff produced stderr output:\n" + stderr |
| if self._process.timed_out: |
| err_str += "ImageDiff timed out\n" |
| if self._process.has_crashed(): |
| err_str += "ImageDiff crashed\n" |
| |
| diff_percent = 0 |
| if output and output.startswith('diff'): |
| m = re.match('diff: (.+)% (passed|failed)', output) |
| if m.group(2) == 'passed': |
| return (None, 0, None) |
| diff_percent = float(m.group(1)) |
| |
| return (output_image, diff_percent, err_str or None) |
| |
| def stop(self): |
| if self._process: |
| self._process.stop() |
| self._process = None |
