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// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/compositor/host_begin_frame_observer.h"
#include <optional>
#include "base/logging.h"
#include "base/task/common/task_annotator.h"
#include "base/time/time.h"
#include "components/viz/common/frame_sinks/begin_frame_args.h"
namespace ui {
namespace {
void WriteBeginFrameIdToTrace(perfetto::EventContext& ctx,
const viz::BeginFrameId frame_id) {
auto* event = ctx.event<perfetto::protos::pbzero::ChromeTrackEvent>();
auto* begin_frame_id = event->set_begin_frame_id();
begin_frame_id->set_source_id(frame_id.source_id);
begin_frame_id->set_sequence_number(frame_id.sequence_number);
}
} // namespace
HostBeginFrameObserver::HostBeginFrameObserver(
SimpleBeginFrameObserverList& observers,
scoped_refptr<base::SingleThreadTaskRunner> task_runner)
: simple_begin_frame_observers_(observers),
task_runner_(std::move(task_runner)) {}
HostBeginFrameObserver::~HostBeginFrameObserver() = default;
void HostBeginFrameObserver::OnStandaloneBeginFrame(
const viz::BeginFrameArgs& args) {
// Mark the current task as interesting, as it maybe be responsible for
// handling input events for flings.
base::TaskAnnotator::MarkCurrentTaskAsInterestingForTracing();
if (args.type == viz::BeginFrameArgs::MISSED) {
return;
}
if (pending_coalesce_callback_) {
TRACE_EVENT_INSTANT("ui", "HostBeginFrameObserver::continue coalescing",
perfetto::Flow::Global(coalesce_flow_id_),
[&](perfetto::EventContext ctx) {
WriteBeginFrameIdToTrace(ctx, args.frame_id);
});
if (!first_coalesced_begin_frame_time_) {
first_coalesced_begin_frame_time_ = begin_frame_args_.frame_time;
}
begin_frame_args_ = args;
return;
}
if ((base::TimeTicks::Now() - args.frame_time) > args.interval) {
begin_frame_args_ = args;
pending_coalesce_callback_ = true;
coalesce_flow_id_ = base::trace_event::GetNextGlobalTraceId();
CHECK(!first_coalesced_begin_frame_time_);
TRACE_EVENT_INSTANT("ui", "HostBeginFrameObserver::start coalescing",
perfetto::Flow::Global(coalesce_flow_id_),
[&](perfetto::EventContext ctx) {
WriteBeginFrameIdToTrace(ctx, args.frame_id);
});
task_runner_->PostDelayedTask(
FROM_HERE,
base::BindOnce(&HostBeginFrameObserver::CoalescedBeginFrame,
weak_factory_.GetWeakPtr()),
base::Microseconds(1));
return;
}
CallObservers(args, std::nullopt);
}
mojo::PendingRemote<viz::mojom::BeginFrameObserver>
HostBeginFrameObserver::GetBoundRemote() {
return receiver_.BindNewPipeAndPassRemote(task_runner_);
}
void HostBeginFrameObserver::CoalescedBeginFrame() {
DCHECK(begin_frame_args_.IsValid());
TRACE_EVENT_INSTANT("ui", "HostBeginFrameObserver::finish coalescing",
perfetto::Flow::Global(coalesce_flow_id_),
[&](perfetto::EventContext ctx) {
WriteBeginFrameIdToTrace(ctx,
begin_frame_args_.frame_id);
});
pending_coalesce_callback_ = false;
viz::BeginFrameArgs args = begin_frame_args_;
begin_frame_args_ = viz::BeginFrameArgs();
std::optional<base::TimeTicks> first_coalesced_begin_frame_time =
first_coalesced_begin_frame_time_;
first_coalesced_begin_frame_time_ = std::nullopt;
coalesce_flow_id_ = ~0ull;
CallObservers(args, first_coalesced_begin_frame_time);
}
// This may be deleted as part of `CallObservers`.
void HostBeginFrameObserver::CallObservers(
const viz::BeginFrameArgs& args,
std::optional<const base::TimeTicks> first_coalesced_begin_frame_time) {
simple_begin_frame_observers_->Notify(&SimpleBeginFrameObserver::OnBeginFrame,
args.frame_time, args.interval,
first_coalesced_begin_frame_time);
}
} // namespace ui
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