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// Copyright 2015 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_EVENTS_OZONE_EVDEV_TOUCH_NOISE_TOUCH_NOISE_FINDER_H_
#define UI_EVENTS_OZONE_EVDEV_TOUCH_NOISE_TOUCH_NOISE_FINDER_H_
#include <bitset>
#include <vector>
#include "base/basictypes.h"
#include "base/time/time.h"
#include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
#include "ui/events/ozone/evdev/touch_evdev_types.h"
namespace ui {
class TouchNoiseFilter;
// Finds touches which are likely touch noise.
class EVENTS_OZONE_EVDEV_EXPORT TouchNoiseFinder {
public:
TouchNoiseFinder();
~TouchNoiseFinder();
// Updates which ABS_MT_SLOTs are noise. |touches| should contain all of the
// in-progress touches at |time| (including noisy touches).
// |touches| should have at most one entry per ABS_MT_SLOT.
void HandleTouches(const std::vector<InProgressTouchEvdev>& touches,
base::TimeDelta time);
// Returns whether the in-progress touch at ABS_MT_SLOT |slot| is noise.
bool SlotHasNoise(size_t slot) const;
private:
// Records how frequently noisy touches occur to UMA.
void RecordUMA(bool had_noise, base::TimeDelta time);
friend class TouchEventConverterEvdevTouchNoiseTest;
// The slots which are noise.
std::bitset<kNumTouchEvdevSlots> slots_with_noise_;
// The time of the previous noise occurence in any of the slots.
base::TimeDelta last_noise_time_;
std::vector<TouchNoiseFilter*> filters_;
DISALLOW_COPY_AND_ASSIGN(TouchNoiseFinder);
};
} // namespace ui
#endif // UI_EVENTS_OZONE_EVDEV_TOUCH_NOISE_TOUCH_NOISE_FINDER_H_
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