# 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 telemetry import multi_page_benchmark


class ImageDecoding(multi_page_benchmark.MultiPageBenchmark):
  # TODO(qinmin): uncomment this after we fix the image decoding benchmark
  # for lazily decoded images
  # def WillNavigateToPage(self, page, tab):
  #   tab.StartTimelineRecording()

  def MeasurePage(self, page, tab, results):
    # TODO(qinmin): This android only test may fail after we switch to
    # deferred image decoding and impl-side painting. Before we fix the test,
    # temporarily disable calculation for lazily decoded images.
    # Uncommented the following lines after we fix the timeline for lazily
    # decoded images.
    return
    # tab.StopTimelineRecording()
    # def _IsDone():
    #   return tab.EvaluateJavaScript('isDone')

    # decode_image_events = \
    #     tab.timeline_model.GetAllOfName('DecodeImage')

    # If it is a real image benchmark, then store only the last-minIterations
    # decode tasks.
    # if (hasattr(page,
    #            'image_decoding_benchmark_limit_results_to_min_iterations') and
    #     page.image_decoding_benchmark_limit_results_to_min_iterations):
    #   assert _IsDone()
    #   min_iterations = tab.EvaluateJavaScript('minIterations')
    #   decode_image_events = decode_image_events[-min_iterations:]

    # durations = [d.duration_ms for d in decode_image_events]
    # if not durations:
    #   results.Add('ImageDecoding_avg', 'ms', 'unsupported')
    #   return
    # image_decoding_avg = sum(durations) / len(durations)
    # results.Add('ImageDecoding_avg', 'ms', image_decoding_avg)