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// 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 <stdint.h>
#include <map>
#include <memory>
#include <string>
#include <utility>
#include <vector>
#include "base/containers/flat_map.h"
#include "base/time/time.h"
#include "services/metrics/public/cpp/ukm_source_id.h"
#include "ui/gfx/geometry/point_f.h"
#if !defined(OS_IOS)
#include "ipc/ipc_param_traits.h" // nogncheck
#include "mojo/public/cpp/bindings/struct_traits.h" // nogncheck
namespace base {
namespace trace_event {
class ConvertableToTraceFormat;
namespace ui {
#if !defined(OS_IOS)
namespace mojom {
class LatencyInfoDataView;
// When adding new components, or new metrics based on LatencyInfo,
// please update
enum LatencyComponentType {
// ---------------------------BEGIN COMPONENT-------------------------------
// BEGIN COMPONENT is when we show the latency begin in chrome://tracing.
// Timestamp when the input event is sent from RenderWidgetHost to renderer.
// ---------------------------NORMAL COMPONENT-------------------------------
// The original timestamp of the touch event which converts to scroll update.
// The original timestamp of the touch event which converts to the *first*
// scroll update in a scroll gesture sequence.
// Original timestamp for input event (e.g. timestamp from kernel).
// Timestamp when the UI event is created.
// Timestamp when the event is dispatched on the main thread of the renderer.
// This is special component indicating there is rendering scheduled for
// the event associated with this LatencyInfo on main thread.
// This is special component indicating there is rendering scheduled for
// the event associated with this LatencyInfo on impl thread.
// Original timestamp of the last event that has been coalesced into this one.
// Timestamp when the event's ack is received by the RWH.
// Timestamp when the frame is swapped in renderer.
// Timestamp of when the display compositor receives a compositor frame from
// the renderer.
// Display compositor can be either in the browser process or in Mus.
// Timestamp of when the gpu service began swap buffers, unlike
// Timestamp when the frame is swapped (i.e. when the rendering caused by
// input event actually takes effect).
enum class SourceEventType {
// TODO( Touchpad scrolling latency report as WHEEL.
class LatencyInfo {
enum : size_t { kMaxInputCoordinates = 2 };
// Map a Latency Component (with a component-specific int64_t id) to a
// timestamp.
using LatencyMap = base::flat_map<LatencyComponentType, base::TimeTicks>;
LatencyInfo(const LatencyInfo& other);
LatencyInfo(LatencyInfo&& other);
LatencyInfo(SourceEventType type);
// For test only.
LatencyInfo(int64_t trace_id, bool terminated);
LatencyInfo& operator=(const LatencyInfo& other);
// Returns true if the vector |latency_info| is valid. Returns false
// if it is not valid and log the |referring_msg|.
// This function is mainly used to check the latency_info vector that
// is passed between processes using IPC message has reasonable size
// so that we are confident the IPC message is not corrupted/compromised.
// This check will go away once the IPC system has better built-in scheme
// for corruption/compromise detection.
static bool Verify(const std::vector<LatencyInfo>& latency_info,
const char* referring_msg);
// Adds trace flow events only to LatencyInfos that are being traced.
static void TraceIntermediateFlowEvents(
const std::vector<LatencyInfo>& latency_info,
const char* trace_name);
// Copy timestamp with type |type| from |other| into |this|.
void CopyLatencyFrom(const LatencyInfo& other, LatencyComponentType type);
// Add timestamps for components that are in |other| but not in |this|.
void AddNewLatencyFrom(const LatencyInfo& other);
// Modifies the current sequence number for a component, and adds a new
// sequence number with the current timestamp.
void AddLatencyNumber(LatencyComponentType component);
// Similar to |AddLatencyNumber|, and also appends |trace_name_str| to
// the trace event's name.
// This function should only be called when adding a BEGIN component.
void AddLatencyNumberWithTraceName(LatencyComponentType component,
const char* trace_name_str);
// Modifies the current sequence number and adds a certain number of events
// for a specific component.
void AddLatencyNumberWithTimestamp(LatencyComponentType component,
base::TimeTicks time);
// Returns true if a component with |type| is found in the latency component.
// The first such component (when iterating over latency_components_) is
// stored to |output| if |output| is not NULL. Returns false if no such
// component is found.
bool FindLatency(LatencyComponentType type, base::TimeTicks* output) const;
void Terminate();
// When GestureScrollUpdate events are coalesced, update the aggregated
// event's scroll_update_delta and the SCROLL_UPDATE_LAST_EVENT_COMPONENT.
void CoalesceScrollUpdateWith(const LatencyInfo& other);
// Scale scroll_update_delta and predicted_scroll_update_delta.
LatencyInfo ScaledBy(float scale) const;
const LatencyMap& latency_components() const { return latency_components_; }
const SourceEventType& source_event_type() const {
return source_event_type_;
void set_source_event_type(SourceEventType type) {
source_event_type_ = type;
bool began() const { return began_; }
bool terminated() const { return terminated_; }
void set_coalesced() { coalesced_ = true; }
bool coalesced() const { return coalesced_; }
int64_t trace_id() const { return trace_id_; }
void set_trace_id(int64_t trace_id) { trace_id_ = trace_id; }
ukm::SourceId ukm_source_id() const { return ukm_source_id_; }
void set_ukm_source_id(ukm::SourceId id) { ukm_source_id_ = id; }
const std::string& trace_name() const { return trace_name_; }
void set_scroll_update_delta(float delta) { scroll_update_delta_ = delta; }
float scroll_update_delta() const { return scroll_update_delta_; }
void set_predicted_scroll_update_delta(float delta) {
predicted_scroll_update_delta_ = delta;
float predicted_scroll_update_delta() const {
return predicted_scroll_update_delta_;
void AddLatencyNumberWithTimestampImpl(LatencyComponentType component,
base::TimeTicks time,
const char* trace_name_str);
// Converts latencyinfo into format that can be dumped into trace buffer.
// Shown as part of the name of the trace event for this LatencyInfo.
// String is empty if no tracing is enabled.
std::string trace_name_;
LatencyMap latency_components_;
// The unique id for matching the ASYNC_BEGIN/END trace event.
int64_t trace_id_;
// UKM Source id to be used for recording UKM metrics associated with this
// event.
ukm::SourceId ukm_source_id_;
// Whether this event has been coalesced into another event.
bool coalesced_;
// Whether a begin component has been added.
bool began_;
// Whether a terminal component has been added.
bool terminated_;
// Stores the type of the first source event.
SourceEventType source_event_type_;
float scroll_update_delta_;
float predicted_scroll_update_delta_;
#if !defined(OS_IOS)
friend struct IPC::ParamTraits<ui::LatencyInfo>;
friend struct mojo::StructTraits<ui::mojom::LatencyInfoDataView,
// This is declared here for use in gtest-based unit tests, but is defined in
// //ui/latency:test_support target.
// Without this the default PrintTo template in gtest tries to pass LatencyInfo
// by value, which leads to an alignment compile error on Windows.
void PrintTo(const LatencyInfo& latency, ::std::ostream* os);
} // namespace ui