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# Copyright (c) 2012 The Chromium Authors. All rights reserved.
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
from datetime import datetime
import glob
import optparse
import os
import re
from telemetry import test
from telemetry.core.backends import png_bitmap
from telemetry.page import page_test
test_data_dir = os.path.abspath(os.path.join(
os.path.dirname(__file__), '..', '..', 'data', 'gpu'))
default_generated_data_dir = os.path.join(test_data_dir, 'generated')
default_reference_image_dir = os.path.join(test_data_dir, 'gpu_reference')
class PixelTestFailure(Exception):
pass
def _DidTestSucceed(tab):
return tab.EvaluateJavaScript('domAutomationController._succeeded')
class PixelValidator(page_test.PageTest):
def __init__(self):
super(PixelValidator, self).__init__('ValidatePage')
def CustomizeBrowserOptions(self, options):
options.AppendExtraBrowserArgs('--enable-gpu-benchmarking')
def InjectJavascript(self):
return [os.path.join(os.path.dirname(__file__), 'pixel.js')]
def ValidatePage(self, page, tab, results):
if not _DidTestSucceed(tab):
raise page_test.Failure('Page indicated a failure')
if not tab.screenshot_supported:
raise page_test.Failure('Browser does not support screenshot capture')
screenshot = tab.Screenshot(5)
if not screenshot:
raise page_test.Failure('Could not capture screenshot')
if hasattr(page, 'test_rect'):
screenshot = screenshot.Crop(
page.test_rect[0], page.test_rect[1],
page.test_rect[2], page.test_rect[3])
image_name = PixelValidator.UrlToImageName(page.display_name)
ref_png = PixelValidator.GetReferenceImage(self.options.reference_dir,
image_name, page.revision, screenshot)
# Test new snapshot against existing reference image
if not ref_png.IsEqual(screenshot, tolerance=2):
PixelValidator.WriteErrorImages(self.options.generated_dir, image_name,
self.options.build_revision, screenshot, ref_png)
raise page_test.Failure('Reference image did not match captured screen')
@staticmethod
def UrlToImageName(url):
image_name = re.sub(r'^(http|https|file)://(/*)', '', url)
image_name = re.sub(r'\.\./', '', image_name)
image_name = re.sub(r'(\.|/|-)', '_', image_name)
return image_name
@staticmethod
def DeleteOldReferenceImages(ref_image_path, cur_revision):
if not cur_revision:
return
old_revisions = glob.glob(ref_image_path + "_*.png")
for rev_path in old_revisions:
m = re.match(r'^.*_(\d+)\.png$', rev_path)
if m and int(m.group(1)) < cur_revision:
print 'Found deprecated reference image. Deleting rev ' + m.group(1)
os.remove(rev_path)
@staticmethod
def GetReferenceImage(img_dir, img_name, cur_revision, screenshot):
if not cur_revision:
cur_revision = 0
image_path = os.path.join(img_dir, img_name)
PixelValidator.DeleteOldReferenceImages(image_path, cur_revision)
image_path = image_path + '_' + str(cur_revision) + '.png'
try:
ref_png = png_bitmap.PngBitmap.FromFile(image_path)
except IOError:
ref_png = None
if ref_png:
return ref_png
print 'Reference image not found. Writing tab contents as reference.'
PixelValidator.WriteImage(image_path, screenshot)
return screenshot
@staticmethod
def WriteErrorImages(img_dir, img_name, build_revision, screenshot, ref_png):
full_image_name = img_name + '_' + str(build_revision)
full_image_name = full_image_name + '.png'
# Save the reference image
# This ensures that we get the right revision number
PixelValidator.WriteImage(
os.path.join(img_dir, full_image_name), ref_png)
PixelValidator.WriteImage(
os.path.join(img_dir, 'FAIL_' + full_image_name), screenshot)
diff_png = screenshot.Diff(ref_png)
PixelValidator.WriteImage(
os.path.join(img_dir, 'DIFF_' + full_image_name), diff_png)
@staticmethod
def WriteImage(image_path, png_image):
output_dir = os.path.dirname(image_path)
if not os.path.exists(output_dir):
os.makedirs(output_dir)
png_image.WriteFile(image_path)
class Pixel(test.Test):
test = PixelValidator
page_set = 'page_sets/pixel_tests.json'
@staticmethod
def AddTestCommandLineOptions(parser):
group = optparse.OptionGroup(parser, 'Pixel test options')
group.add_option('--generated-dir',
help='Overrides the default location for generated test images that do '
'not match reference images',
default=default_generated_data_dir)
group.add_option('--reference-dir',
help='Overrides the default location for reference images',
default=default_reference_image_dir)
group.add_option('--build-revision',
help='Chrome revision being tested.',
default="unknownrev")
parser.add_option_group(group)
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