[Telemetry] Reorganize everything.

tools/telemetry/telemetry/png_bitmap.py

-# 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.
-import sys
-import os
-import base64
-
-PNG_PATH = os.path.join(os.path.dirname(__file__), '../third_party/png')
-if PNG_PATH not in sys.path:
-  sys.path.append(PNG_PATH)
-
-import png # pylint: disable=F0401
-
-class PngColor(object):
-  """Encapsulates an RGB color retreived from a PngBitmap"""
-
-  def __init__(self, r, g, b, a=255):
-    self.r = r
-    self.g = g
-    self.b = b
-    self.a = a
-
-  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(PngColor(r, g, b), tolerance)
-
-  def AssertIsRGBA(self, r, g, b, a, tolerance=0):
-    assert self.IsEqual(PngColor(r, g, b, a), tolerance)
-
-class PngBitmap(object):
-  """Utilities for parsing and inspecting inspecting a PNG"""
-
-  def __init__(self, base64_png):
-    self._png_data = base64.b64decode(base64_png)
-    self._png = png.Reader(bytes=self._png_data)
-    rgba8_data = self._png.asRGBA8()
-    self._width = rgba8_data[0]
-    self._height = rgba8_data[1]
-    self._pixels = list(rgba8_data[2])
-    self._metadata = rgba8_data[3]
-
-  @property
-  def width(self):
-    """Width of the snapshot"""
-    return self._width
-
-  @property
-  def height(self):
-    """Height of the snapshot"""
-    return self._height
-
-  def GetPixelColor(self, x, y):
-    """Returns a PngColor for the pixel at (x, y)"""
-    row = self._pixels[y]
-    offset = x * 4
-    return PngColor(row[offset], row[offset+1], row[offset+2], row[offset+3])
-
-  def WriteFile(self, path):
-    with open(path, "wb") as f:
-      f.write(self._png_data)