cc/output/latency_info_swap_promise.cc

// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#include "cc/output/latency_info_swap_promise.h"

#include <stdint.h>

#include "base/logging.h"
#include "base/trace_event/trace_event.h"

namespace {
ui::LatencyComponentType DidNotSwapReasonToLatencyComponentType(
    cc::SwapPromise::DidNotSwapReason reason) {
  switch (reason) {
    case cc::SwapPromise::ACTIVATION_FAILS:
    case cc::SwapPromise::SWAP_FAILS:
      return ui::INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT;
    case cc::SwapPromise::COMMIT_FAILS:
      return ui::INPUT_EVENT_LATENCY_TERMINATED_COMMIT_FAILED_COMPONENT;
    case cc::SwapPromise::COMMIT_NO_UPDATE:
      return ui::INPUT_EVENT_LATENCY_TERMINATED_COMMIT_NO_UPDATE_COMPONENT;
  }
  NOTREACHED() << "Unhandled DidNotSwapReason.";
  return ui::INPUT_EVENT_LATENCY_TERMINATED_SWAP_FAILED_COMPONENT;
}
}  // namespace

namespace cc {

LatencyInfoSwapPromise::LatencyInfoSwapPromise(const ui::LatencyInfo& latency)
    : latency_(latency) {
}

LatencyInfoSwapPromise::~LatencyInfoSwapPromise() {
}

void LatencyInfoSwapPromise::DidSwap(CompositorFrameMetadata* metadata) {
  DCHECK(!latency_.terminated());
  metadata->latency_info.push_back(latency_);
}

SwapPromise::DidNotSwapAction LatencyInfoSwapPromise::DidNotSwap(
    DidNotSwapReason reason) {
  latency_.AddLatencyNumber(DidNotSwapReasonToLatencyComponentType(reason), 0,
                            0);
  // TODO(miletus): Turn this back on once per-event LatencyInfo tracking
  // is enabled in GPU side.
  // DCHECK(latency_.terminated);
  return DidNotSwapAction::BREAK_PROMISE;
}

int64_t LatencyInfoSwapPromise::TraceId() const {
  return latency_.trace_id();
}

// Trace the original LatencyInfo of a LatencyInfoSwapPromise
void LatencyInfoSwapPromise::OnCommit() {
  TRACE_EVENT_WITH_FLOW1("input,benchmark",
                         "LatencyInfo.Flow",
                         TRACE_ID_DONT_MANGLE(TraceId()),
                         TRACE_EVENT_FLAG_FLOW_IN | TRACE_EVENT_FLAG_FLOW_OUT,
                         "step", "HandleInputEventMainCommit");
}

}  // namespace cc