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      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
     67