cc/output/begin_frame_args.cc

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/output/begin_frame_args.h"
   6
   7 namespace cc {
   8
   9 BeginFrameArgs::BeginFrameArgs()
  10   : frame_time(base::TimeTicks()),
  11     deadline(base::TimeTicks()),
  12     interval(base::TimeDelta::FromMicroseconds(-1)) {
  13 }
  14
  15 BeginFrameArgs::BeginFrameArgs(base::TimeTicks frame_time,
  16                                base::TimeTicks deadline,
  17                                base::TimeDelta interval)
  18   : frame_time(frame_time),
  19     deadline(deadline),
  20     interval(interval)
  21 {}
  22
  23 BeginFrameArgs BeginFrameArgs::Create(base::TimeTicks frame_time,
  24                                       base::TimeTicks deadline,
  25                                       base::TimeDelta interval) {
  26   return BeginFrameArgs(frame_time, deadline, interval);
  27 }
  28
  29 BeginFrameArgs BeginFrameArgs::CreateForSynchronousCompositor() {
  30   // For WebView/SynchronousCompositor, we always want to draw immediately,
  31   // so we set the deadline to 0 and guess that the interval is 16 milliseconds.
  32   return BeginFrameArgs(base::TimeTicks::Now(),
  33                         base::TimeTicks(),
  34                         DefaultInterval());
  35 }
  36
  37 BeginFrameArgs BeginFrameArgs::CreateForTesting() {
  38   base::TimeTicks now = base::TimeTicks::Now();
  39   return BeginFrameArgs(now,
  40                         now + (DefaultInterval() / 2),
  41                         DefaultInterval());
  42 }
  43
  44 BeginFrameArgs BeginFrameArgs::CreateExpiredForTesting() {
  45   base::TimeTicks now = base::TimeTicks::Now();
  46   return BeginFrameArgs(now,
  47                         now - DefaultInterval(),
  48                         DefaultInterval());
  49 }
  50
  51 base::TimeDelta BeginFrameArgs::DefaultDeadlineAdjustment() {
  52   // Using a large deadline adjustment will effectively revert BeginFrame
  53   // scheduling to the hard vsync scheduling we used to have.
  54   return base::TimeDelta::FromSeconds(-1);
  55 }
  56
  57 base::TimeDelta BeginFrameArgs::DefaultInterval() {
  58   return base::TimeDelta::FromMicroseconds(16666);
  59 }
  60
  61 base::TimeDelta BeginFrameArgs::DefaultRetroactiveBeginFramePeriod() {
  62   return base::TimeDelta::FromMicroseconds(4444);
  63 }
  64
  65
  66 }  // namespace cc