cc/output/latency_info_swap_promise.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/latency_info_swap_promise.h"
   6
   7 #include "base/logging.h"
   8 #include "base/trace_event/trace_event.h"
   9
  10 namespace {
  11 ui::LatencyComponentType DidNotSwapReasonToLatencyComponentType(
  12     cc::SwapPromise::DidNotSwapReason reason) {
  13   switch (reason) {
  14     case cc::SwapPromise::ACTIVATION_FAILS:
  15     case cc::SwapPromise::SWAP_FAILS:
  16       return ui::INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT;
  17     case cc::SwapPromise::COMMIT_FAILS:
  18       return ui::INPUT_EVENT_LATENCY_TERMINATED_COMMIT_FAILED_COMPONENT;
  19     case cc::SwapPromise::COMMIT_NO_UPDATE:
  20       return ui::INPUT_EVENT_LATENCY_TERMINATED_COMMIT_NO_UPDATE_COMPONENT;
  21   }
  22   NOTREACHED() << "Unhandled DidNotSwapReason.";
  23   return ui::INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT;
  24 }
  25 }  // namespace
  26
  27 namespace cc {
  28
  29 LatencyInfoSwapPromise::LatencyInfoSwapPromise(const ui::LatencyInfo& latency)
  30     : latency_(latency) {
  31 }
  32
  33 LatencyInfoSwapPromise::~LatencyInfoSwapPromise() {
  34 }
  35
  36 void LatencyInfoSwapPromise::DidSwap(CompositorFrameMetadata* metadata) {
  37   DCHECK(!latency_.terminated());
  38   metadata->latency_info.push_back(latency_);
  39 }
  40
  41 void LatencyInfoSwapPromise::DidNotSwap(DidNotSwapReason reason) {
  42   latency_.AddLatencyNumber(DidNotSwapReasonToLatencyComponentType(reason), 0,
  43                             0);
  44   // TODO(miletus): Turn this back on once per-event LatencyInfo tracking
  45   // is enabled in GPU side.
  46   // DCHECK(latency_.terminated);
  47 }
  48
  49 int64 LatencyInfoSwapPromise::TraceId() const {
  50   return latency_.trace_id();
  51 }
  52
  53 // Trace the original LatencyInfo of a LatencyInfoSwapPromise
  54 void LatencyInfoSwapPromise::OnCommit() {
  55   TRACE_EVENT_WITH_FLOW1("input,benchmark",
  56                          "LatencyInfo.Flow",
  57                          TRACE_ID_DONT_MANGLE(TraceId()),
  58                          TRACE_EVENT_FLAG_FLOW_IN | TRACE_EVENT_FLAG_FLOW_OUT,
  59                          "step", "HandleInputEventMainCommit");
  60 }
  61
  62 }  // namespace cc