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'''
Compares the rendererings of serialized SkPictures to expected result.
Copyright 2012 Google Inc.
Use of this source code is governed by a BSD-style license that can be
found in the LICENSE file.
'''
# common Python modules
import os
import optparse
import sys
import shutil
import tempfile
USAGE_STRING = 'Usage: %s input... expectedDir render_app [reander_app_args]'
HELP_STRING = '''
Compares the renderings of serialized SkPicture files and directories specified
by input with the files in expectedDir. Note, files in directoriers are
expected to end with .skp.
'''
def RunCommand(command):
"""Run a command.
@param command the command as a single string
"""
print 'running command [%s]...' % command
os.system(command)
def FindPathToProgram(program):
"""Return path to an existing program binary, or raise an exception if we
cannot find one.
@param program the name of the program that is being looked for
"""
trunk_path = os.path.abspath(os.path.join(os.path.dirname(__file__),
os.pardir))
possible_paths = [os.path.join(trunk_path, 'out', 'Release', program),
os.path.join(trunk_path, 'out', 'Debug', program),
os.path.join(trunk_path, 'out', 'Release',
program + ".exe"),
os.path.join(trunk_path, 'out', 'Debug',
program + ".exe")]
for try_path in possible_paths:
if os.path.isfile(try_path):
return try_path
raise Exception('cannot find %s in paths %s; maybe you need to '
'build %s?' % (program, possible_paths, program))
def RenderSkps(inputs, render_dir, render_app, args):
"""Renders the serialized SkPictures.
Uses the render_pictures program to do the rendering.
@param inputs the location(s) to read the serlialized SkPictures
@param render_dir the location to write out the rendered images
"""
renderer_path = FindPathToProgram(render_app)
inputs_as_string = " ".join(inputs)
command = '%s %s %s' % (renderer_path, inputs_as_string, render_dir)
command += args
RunCommand(command)
def DiffRenderings(expected_dir, comparison_dir, diff_dir):
"""Diffs the rendered SkPicture files with the baseline files.
Uses the skdiff program to do the diffing.
@param expected_dir the location of the baseline images.
@param comparison_dir the location of the images to comapre with the
baseline
@param diff_dir the location to write out the diff results
"""
skdiff_path = FindPathToProgram('skdiff')
RunCommand('%s %s %s %s %s' %
(skdiff_path, expected_dir, comparison_dir, diff_dir,
'--noprintdirs'))
def Cleanup(render_dir_option, diff_dir_option, render_dir, diff_dir):
"""Deletes any temporary folders and files created.
@param foo_option The OptionParser parsed render_dir or diff_dir vars.
If these variables are not passed by user we ended up creating
temporary directories (render_dir, diff_dir) which we will remove.
@param render_dir the directory where the rendered images were written
@param diff_dir the directory where the diff results were written
"""
if (not render_dir_option):
if (os.path.isdir(render_dir)):
shutil.rmtree(render_dir)
if (not diff_dir_option):
if (os.path.isdir(diff_dir)):
shutil.rmtree(diff_dir)
def TestRenderSkps(inputs, expected_dir, render_dir_option, diff_dir_option,
render_app, render_args):
if (render_dir_option):
render_dir = render_dir_option
else:
render_dir = tempfile.mkdtemp()
if (diff_dir_option):
diff_dir = diff_dir_option
else:
diff_dir = tempfile.mkdtemp()
try:
RenderSkps(inputs, render_dir, render_app, render_args)
DiffRenderings(expected_dir, render_dir, diff_dir)
finally:
Cleanup(render_dir_option, diff_dir_option, render_dir, diff_dir)
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