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::SYNCHRONOUS:
  19       return "SYNCHRONOUS";
  20     case BeginFrameArgs::MISSED:
  21       return "MISSED";
  22     case BeginFrameArgs::BEGIN_FRAME_ARGS_TYPE_MAX:
  23       return "BEGIN_FRAME_ARGS_TYPE_MAX";
  24   }
  25   NOTREACHED();
  26   return "???";
  27 }
  28
  29 BeginFrameArgs::BeginFrameArgs()
  30     : frame_time(base::TimeTicks()),
  31       deadline(base::TimeTicks()),
  32       interval(base::TimeDelta::FromMicroseconds(-1)),
  33       type(BeginFrameArgs::INVALID) {
  34 }
  35
  36 BeginFrameArgs::BeginFrameArgs(base::TimeTicks frame_time,
  37                                base::TimeTicks deadline,
  38                                base::TimeDelta interval,
  39                                BeginFrameArgs::BeginFrameArgsType type)
  40     : frame_time(frame_time),
  41       deadline(deadline),
  42       interval(interval),
  43       type(type) {
  44 }
  45
  46 BeginFrameArgs BeginFrameArgs::Create(BeginFrameArgs::CreationLocation location,
  47                                       base::TimeTicks frame_time,
  48                                       base::TimeTicks deadline,
  49                                       base::TimeDelta interval,
  50                                       BeginFrameArgs::BeginFrameArgsType type) {
  51   DCHECK_NE(type, BeginFrameArgs::INVALID);
  52   DCHECK_NE(type, BeginFrameArgs::BEGIN_FRAME_ARGS_TYPE_MAX);
  53 #ifdef NDEBUG
  54   return BeginFrameArgs(frame_time, deadline, interval, type);
  55 #else
  56   BeginFrameArgs args = BeginFrameArgs(frame_time, deadline, interval, type);
  57   args.created_from = location;
  58   return args;
  59 #endif
  60 }
  61
  62 scoped_refptr<base::trace_event::ConvertableToTraceFormat>
  63 BeginFrameArgs::AsValue() const {
  64   scoped_refptr<base::trace_event::TracedValue> state =
  65       new base::trace_event::TracedValue();
  66   AsValueInto(state.get());
  67   return state;
  68 }
  69
  70 void BeginFrameArgs::AsValueInto(base::trace_event::TracedValue* state) const {
  71   state->SetString("type", "BeginFrameArgs");
  72   state->SetString("subtype", TypeToString(type));
  73   state->SetDouble("frame_time_us", frame_time.ToInternalValue());
  74   state->SetDouble("deadline_us", deadline.ToInternalValue());
  75   state->SetDouble("interval_us", interval.InMicroseconds());
  76 #ifndef NDEBUG
  77   state->SetString("created_from", created_from.ToString());
  78 #endif
  79 }
  80
  81 // This is a hard-coded deadline adjustment that assumes 60Hz, to be used in
  82 // cases where a good estimated draw time is not known. Using 1/3 of the vsync
  83 // as the default adjustment gives the Browser the last 1/3 of a frame to
  84 // produce output, the Renderer Impl thread the middle 1/3 of a frame to produce
  85 // ouput, and the Renderer Main thread the first 1/3 of a frame to produce
  86 // output.
  87 base::TimeDelta BeginFrameArgs::DefaultEstimatedParentDrawTime() {
  88   return base::TimeDelta::FromMicroseconds(16666 / 3);
  89 }
  90
  91 base::TimeDelta BeginFrameArgs::DefaultInterval() {
  92   return base::TimeDelta::FromMicroseconds(16666);
  93 }
  94
  95 }  // namespace cc