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// Copyright 2019 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_FILTER_NEURAL_STYLUS_PALM_DETECTION_FILTER_H_
#define UI_EVENTS_OZONE_EVDEV_TOUCH_FILTER_NEURAL_STYLUS_PALM_DETECTION_FILTER_H_
#include <bitset>
#include <cstdint>
#include <map>
#include <memory>
#include <string>
#include <unordered_set>
#include <utility>
#include <vector>
#include "base/time/time.h"
#if !defined(__ANDROID__)
#include "ui/events/ozone/evdev/event_device_info.h"
#endif
#include "ui/events/ozone/evdev/touch_evdev_types.h"
#include "ui/events/ozone/evdev/touch_filter/neural_stylus_palm_detection_filter_model.h"
#include "ui/events/ozone/evdev/touch_filter/neural_stylus_palm_detection_filter_util.h"
#include "ui/events/ozone/evdev/touch_filter/palm_detection_filter.h"
#include "ui/events/ozone/evdev/touch_filter/shared_palm_detection_filter_state.h"
#include "ui/gfx/geometry/point_f.h"
namespace ui {
// An implementation of PalmDetectionFilter that relies on a DNN implementation
// to decide on palm detection. Requires a configured model as an argument.
// Heuristics are added for handling short strokes
class COMPONENT_EXPORT(EVDEV) NeuralStylusPalmDetectionFilter
: public PalmDetectionFilter {
public:
// Takes ownership of the model.
NeuralStylusPalmDetectionFilter(
#if !defined(__ANDROID__)
const EventDeviceInfo& devinfo,
#else
PalmFilterDeviceInfo palm_filter_device_info,
#endif
std::unique_ptr<NeuralStylusPalmDetectionFilterModel> palm_model,
SharedPalmDetectionFilterState* shared_palm_state);
NeuralStylusPalmDetectionFilter(const NeuralStylusPalmDetectionFilter&) =
delete;
NeuralStylusPalmDetectionFilter& operator=(
const NeuralStylusPalmDetectionFilter&) = delete;
~NeuralStylusPalmDetectionFilter() override;
void Filter(const std::vector<InProgressTouchEvdev>& touches,
base::TimeTicks time,
std::bitset<kNumTouchEvdevSlots>* slots_to_hold,
std::bitset<kNumTouchEvdevSlots>* slots_to_suppress) override;
#if !defined(__ANDROID__)
static bool CompatibleWithNeuralStylusPalmDetectionFilter(
const EventDeviceInfo& devinfo);
static bool CompatibleWithNeuralStylusPalmDetectionFilter(
const EventDeviceInfo& devinfo,
const std::string& ozone_params_switch_string);
#endif
static const int kFeaturesPerSample;
static const int kExtraFeaturesForNeighbor;
static const char kFilterName[];
std::string FilterNameForTesting() const override;
private:
void FindNearestNeighborsWithin(
int neighbor_count,
float max_distance,
const PalmFilterStroke& stroke,
std::vector<std::pair<float, int>>* nearest_strokes) const;
void FindBiggestNeighborsWithin(
int neighbor_count,
unsigned long min_sample_count,
float max_distance,
const PalmFilterStroke& stroke,
std::vector<std::pair<float, int>>* biggest_strokes) const;
bool DetectSpuriousStroke(const std::vector<float>& features,
int tracking_id,
float threshold) const;
// Extracts the feature vector for the specified stroke.
std::vector<float> ExtractFeatures(int tracking_id) const;
void AppendFeatures(const PalmFilterStroke& stroke,
std::vector<float>* features) const;
void AppendFeaturesAsNeighbor(const PalmFilterStroke& stroke,
float distance,
std::vector<float>* features) const;
bool ShouldDecideStroke(const PalmFilterStroke& stroke) const;
bool IsHeuristicPalmStroke(const PalmFilterStroke& stroke) const;
void EraseOldStrokes(base::TimeTicks time);
std::bitset<kNumTouchEvdevSlots> is_palm_;
std::bitset<kNumTouchEvdevSlots> is_delay_;
std::map<int, PalmFilterStroke> strokes_;
base::TimeTicks previous_report_time_;
std::unordered_set<int> active_tracking_ids_;
int tracking_ids_count_within_session_;
int tracking_ids_[kNumTouchEvdevSlots];
const PalmFilterDeviceInfo palm_filter_dev_info_;
std::unique_ptr<NeuralStylusPalmDetectionFilterModel> model_;
};
} // namespace ui
#endif // UI_EVENTS_OZONE_EVDEV_TOUCH_FILTER_NEURAL_STYLUS_PALM_DETECTION_FILTER_H_
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