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 #include "base/trace_event/trace_event_argument.h"
   8 #include "ui/gfx/frame_time.h"
   9
  10 namespace cc {
  11
  12 const char* BeginFrameArgs::TypeToString(BeginFrameArgsType type) {
  13   switch (type) {
  14     case BeginFrameArgs::INVALID:
  15       return "INVALID";
  16     case BeginFrameArgs::NORMAL:
  17       return "NORMAL";
  18     case BeginFrameArgs::MISSED:
  19       return "MISSED";
  20     case BeginFrameArgs::BEGIN_FRAME_ARGS_TYPE_MAX:
  21       return "BEGIN_FRAME_ARGS_TYPE_MAX";
  22   }
  23   NOTREACHED();
  24   return "???";
  25 }
  26
  27 BeginFrameArgs::BeginFrameArgs()
  28     : frame_time(base::TimeTicks()),
  29       deadline(base::TimeTicks()),
  30       interval(base::TimeDelta::FromMicroseconds(-1)),
  31       type(BeginFrameArgs::INVALID) {
  32 }
  33
  34 BeginFrameArgs::BeginFrameArgs(base::TimeTicks frame_time,
  35                                base::TimeTicks deadline,
  36                                base::TimeDelta interval,
  37                                BeginFrameArgs::BeginFrameArgsType type)
  38     : frame_time(frame_time),
  39       deadline(deadline),
  40       interval(interval),
  41       type(type) {
  42 }
  43
  44 BeginFrameArgs BeginFrameArgs::Create(BeginFrameArgs::CreationLocation location,
  45                                       base::TimeTicks frame_time,
  46                                       base::TimeTicks deadline,
  47                                       base::TimeDelta interval,
  48                                       BeginFrameArgs::BeginFrameArgsType type) {
  49   DCHECK_NE(type, BeginFrameArgs::INVALID);
  50   DCHECK_NE(type, BeginFrameArgs::BEGIN_FRAME_ARGS_TYPE_MAX);
  51 #ifdef NDEBUG
  52   return BeginFrameArgs(frame_time, deadline, interval, type);
  53 #else
  54   BeginFrameArgs args = BeginFrameArgs(frame_time, deadline, interval, type);
  55   args.created_from = location;
  56   return args;
  57 #endif
  58 }
  59
  60 scoped_refptr<base::trace_event::ConvertableToTraceFormat>
  61 BeginFrameArgs::AsValue() const {
  62   scoped_refptr<base::trace_event::TracedValue> state =
  63       new base::trace_event::TracedValue();
  64   AsValueInto(state.get());
  65   return state;
  66 }
  67
  68 void BeginFrameArgs::AsValueInto(base::trace_event::TracedValue* state) const {
  69   state->SetString("type", "BeginFrameArgs");
  70   state->SetString("subtype", TypeToString(type));
  71   state->SetDouble("frame_time_us", frame_time.ToInternalValue());
  72   state->SetDouble("deadline_us", deadline.ToInternalValue());
  73   state->SetDouble("interval_us", interval.InMicroseconds());
  74 #ifndef NDEBUG
  75   state->SetString("created_from", created_from.ToString());
  76 #endif
  77 }
  78
  79 // This is a hard-coded deadline adjustment that assumes 60Hz, to be used in
  80 // cases where a good estimated draw time is not known. Using 1/3 of the vsync
  81 // as the default adjustment gives the Browser the last 1/3 of a frame to
  82 // produce output, the Renderer Impl thread the middle 1/3 of a frame to produce
  83 // ouput, and the Renderer Main thread the first 1/3 of a frame to produce
  84 // output.
  85 base::TimeDelta BeginFrameArgs::DefaultEstimatedParentDrawTime() {
  86   return base::TimeDelta::FromMicroseconds(16666 / 3);
  87 }
  88
  89 base::TimeDelta BeginFrameArgs::DefaultInterval() {
  90   return base::TimeDelta::FromMicroseconds(16666);
  91 }
  92
  93 }  // namespace cc