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// Copyright 2014 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/scheduler/begin_frame_tracker.h"
#include "base/trace_event/trace_event.h"
#include "base/tracing/protos/chrome_track_event.pbzero.h"
namespace cc {
BeginFrameTracker::BeginFrameTracker(const base::Location& location)
: location_(location),
location_string_(location.ToString()),
current_finished_at_(base::TimeTicks() + base::Microseconds(-1)) {}
BeginFrameTracker::~BeginFrameTracker() = default;
void BeginFrameTracker::Start(const viz::BeginFrameArgs& new_args) {
// Trace the frame time being passed between BeginFrameTrackers.
TRACE_EVENT_WITH_FLOW1(TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler.frames"),
"BeginFrameArgs",
new_args.frame_time.since_origin().InMicroseconds(),
TRACE_EVENT_FLAG_FLOW_IN | TRACE_EVENT_FLAG_FLOW_OUT,
"location", location_string_);
// Trace this specific begin frame tracker Start/Finish times.
TRACE_EVENT_COPY_NESTABLE_ASYNC_BEGIN2(
TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler.frames"),
location_string_.c_str(),
TRACE_ID_WITH_SCOPE(location_string_.c_str(),
new_args.frame_time.since_origin().InMicroseconds()),
"new args", new_args.AsValue(), "current args", current_args_.AsValue());
// Check the new viz::BeginFrameArgs are valid and monotonically increasing.
DCHECK(new_args.IsValid());
DCHECK_LE(current_args_.frame_time, new_args.frame_time);
DCHECK(HasFinished())
<< "Tried to start a new frame before finishing an existing frame.";
current_updated_at_ = base::TimeTicks::Now();
current_args_ = new_args;
current_finished_at_ = base::TimeTicks();
// TODO(mithro): Add UMA tracking of delta between current_updated_at_ time
// and the new_args.frame_time argument. This will give us how long after a
// viz::BeginFrameArgs message was created before we started processing it.
}
const viz::BeginFrameArgs& BeginFrameTracker::Current() const {
DCHECK(!HasFinished())
<< "Tried to use viz::BeginFrameArgs after marking the frame finished.";
DCHECK(current_args_.IsValid())
<< "Tried to use viz::BeginFrameArgs before starting a frame!";
return current_args_;
}
void BeginFrameTracker::Finish() {
DCHECK(!HasFinished()) << "Tried to finish an already finished frame";
current_finished_at_ = base::TimeTicks::Now();
TRACE_EVENT_COPY_NESTABLE_ASYNC_END0(
TRACE_DISABLED_BY_DEFAULT("cc.debug.scheduler.frames"),
location_string_.c_str(),
TRACE_ID_WITH_SCOPE(
location_string_.c_str(),
current_args_.frame_time.since_origin().InMicroseconds()));
}
const viz::BeginFrameArgs& BeginFrameTracker::Last() const {
DCHECK(current_args_.IsValid())
<< "Tried to use last viz::BeginFrameArgs before starting a frame!";
DCHECK(HasFinished())
<< "Tried to use last viz::BeginFrameArgs before the frame is finished.";
return current_args_;
}
bool BeginFrameTracker::HasLast() const {
DCHECK(HasFinished())
<< "Tried to use last viz::BeginFrameArgs before the frame is finished.";
return current_args_.IsValid();
}
base::TimeDelta BeginFrameTracker::Interval() const {
base::TimeDelta interval = current_args_.interval;
// Normal interval will be ~16ms, 200Hz (5ms) screens are the fastest
// easily available so anything less than that is likely an error.
if (interval < base::Milliseconds(1)) {
interval = viz::BeginFrameArgs::DefaultInterval();
}
return interval;
}
void BeginFrameTracker::AsProtozeroInto(
perfetto::EventContext& ctx,
base::TimeTicks now,
perfetto::protos::pbzero::BeginImplFrameArgsV2* state) const {
state->set_updated_at_us(current_updated_at_.since_origin().InMicroseconds());
state->set_finished_at_us(
current_finished_at_.since_origin().InMicroseconds());
if (HasFinished()) {
state->set_state(
perfetto::protos::pbzero::BeginImplFrameArgsV2::BEGIN_FRAME_FINISHED);
current_args_.AsProtozeroInto(ctx, state->set_current_args());
} else {
state->set_state(
perfetto::protos::pbzero::BeginImplFrameArgsV2::BEGIN_FRAME_USING);
current_args_.AsProtozeroInto(ctx, state->set_last_args());
}
base::TimeTicks frame_time = current_args_.frame_time;
base::TimeTicks deadline = current_args_.deadline;
base::TimeDelta interval = current_args_.interval;
auto* timestamps = state->set_timestamps_in_us();
timestamps->set_interval_delta(interval.InMicroseconds());
timestamps->set_now_to_deadline_delta((deadline - now).InMicroseconds());
timestamps->set_frame_time_to_now_delta((now - frame_time).InMicroseconds());
timestamps->set_frame_time_to_deadline_delta(
(deadline - frame_time).InMicroseconds());
timestamps->set_now(now.since_origin().InMicroseconds());
timestamps->set_frame_time(frame_time.since_origin().InMicroseconds());
timestamps->set_deadline(deadline.since_origin().InMicroseconds());
}
const viz::BeginFrameArgs& BeginFrameTracker::DangerousMethodCurrentOrLast()
const {
if (!HasFinished()) {
return Current();
} else {
return Last();
}
}
} // namespace cc
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