| # Copyright 2014 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. |
| |
| import collections |
| |
| class RgbaColor(collections.namedtuple('RgbaColor', ['r', 'g', 'b', 'a'])): |
| """Encapsulates an RGBA color retrieved from an image.""" |
| def __new__(cls, r, g, b, a=255): |
| return super(RgbaColor, cls).__new__(cls, r, g, b, a) |
| |
| def __int__(self): |
| return (self.r << 16) | (self.g << 8) | self.b |
| |
| def IsEqual(self, expected_color, tolerance=0): |
| """Verifies that the color is within a given tolerance of |
| the expected color.""" |
| r_diff = abs(self.r - expected_color.r) |
| g_diff = abs(self.g - expected_color.g) |
| b_diff = abs(self.b - expected_color.b) |
| a_diff = abs(self.a - expected_color.a) |
| return (r_diff <= tolerance and g_diff <= tolerance |
| and b_diff <= tolerance and a_diff <= tolerance) |
| |
| def AssertIsRGB(self, r, g, b, tolerance=0): |
| assert self.IsEqual(RgbaColor(r, g, b), tolerance) |
| |
| def AssertIsRGBA(self, r, g, b, a, tolerance=0): |
| assert self.IsEqual(RgbaColor(r, g, b, a), tolerance) |
| |
| |
| WEB_PAGE_TEST_ORANGE = RgbaColor(222, 100, 13) |
| WHITE = RgbaColor(255, 255, 255) |
