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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.
#ifndef UI_BASE_LATENCY_INFO_H_
#define UI_BASE_LATENCY_INFO_H_
#include <map>
#include <utility>
#include "base/basictypes.h"
#include "base/time/time.h"
#include "ui/base/ui_export.h"
namespace ui {
enum LatencyComponentType {
// Timestamp when the input event is sent from RenderWidgetHost to renderer.
INPUT_EVENT_LATENCY_RWH_COMPONENT,
// Timestamp when the injected event is sent from RenderWidgetHost to
// renderer. For example, in Aura, touch event's LatencyInfo is carried over
// to the injected gesture event. So gesture event's
// INPUT_EVENT_LATENCY_RWH_COMPONENT is the timestamp when its original touch
// events is sent from RWH to renderer. In non-aura platform,
// INPUT_EVENT_LATENCY_RWH_COMPONENT is the same as
// INPUT_EVENT_LATENCY_INJECTED_RWH_COMPONENT.
INPUT_EVENT_LATENCY_INJECTED_RWH_COMPONENT,
// Original timestamp for input event (e.g. timestamp from kernel).
INPUT_EVENT_LATENCY_ORIGINAL_COMPONENT,
// Timestamp when the UI event is created.
INPUT_EVENT_LATENCY_UI_COMPONENT,
// Timestamp when the event is acked from renderer. This is currently set
// only for touch events.
INPUT_EVENT_LATENCY_ACKED_COMPONENT
};
struct UI_EXPORT LatencyInfo {
struct LatencyComponent {
// Nondecreasing number that can be used to determine what events happened
// in the component at the time this struct was sent on to the next
// component.
int64 sequence_number;
// Average time of events that happened in this component.
base::TimeTicks event_time;
// Count of events that happened in this component
uint32 event_count;
};
// Map a Latency Component (with a component-specific int64 id) to a
// component info.
typedef std::map<std::pair<LatencyComponentType, int64>, LatencyComponent>
LatencyMap;
LatencyInfo();
~LatencyInfo();
// Merges the contents of another LatencyInfo into this one.
void MergeWith(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,
int64 id,
int64 component_sequence_number);
// Modifies the current sequence number and adds a certain number of events
// for a specific component.
void AddLatencyNumberWithTimestamp(LatencyComponentType component,
int64 id,
int64 component_sequence_number,
base::TimeTicks time,
uint32 event_count);
// Returns true if the a component with |type| and |id| is found in
// the latency_components and the component is stored to |output| if
// |output| is not NULL. Returns false if no such component is found.
bool FindLatency(LatencyComponentType type,
int64 id,
LatencyComponent* output) const;
void Clear();
LatencyMap latency_components;
// This represents the final time that a frame is displayed it.
base::TimeTicks swap_timestamp;
};
} // namespace ui
#endif // UI_BASE_LATENCY_INFO_H_
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