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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.
#include "ui/events/ozone/evdev/touch_filter/neural_stylus_palm_detection_filter_util.h"
#include <algorithm>
namespace ui {
PalmFilterDeviceInfo CreatePalmFilterDeviceInfo(
const EventDeviceInfo& devinfo) {
PalmFilterDeviceInfo info;
info.max_x = devinfo.GetAbsMaximum(ABS_MT_POSITION_X);
info.x_res = devinfo.GetAbsResolution(ABS_MT_POSITION_X);
info.max_y = devinfo.GetAbsMaximum(ABS_MT_POSITION_Y);
info.y_res = devinfo.GetAbsResolution(ABS_MT_POSITION_Y);
if (info.x_res == 0) {
info.x_res = 1;
}
if (info.y_res == 0) {
info.y_res = 1;
}
info.major_radius_res = devinfo.GetAbsResolution(ABS_MT_TOUCH_MAJOR);
if (info.major_radius_res == 0) {
// Device does not report major res: set to 1.
info.major_radius_res = 1;
}
if (devinfo.HasAbsEvent(ABS_MT_TOUCH_MINOR)) {
info.minor_radius_supported = true;
info.minor_radius_res = devinfo.GetAbsResolution(ABS_MT_TOUCH_MINOR);
} else {
info.minor_radius_supported = false;
info.minor_radius_res = info.major_radius_res;
}
if (info.minor_radius_res == 0) {
// Device does not report minor res: set to 1.
info.minor_radius_res = 1;
}
return info;
}
namespace {
float ScaledRadius(
float radius,
const NeuralStylusPalmDetectionFilterModelConfig& model_config) {
if (model_config.radius_polynomial_resize.empty()) {
return radius;
}
float return_value = 0.0f;
for (uint32_t i = 0; i < model_config.radius_polynomial_resize.size(); ++i) {
float power = model_config.radius_polynomial_resize.size() - 1 - i;
return_value +=
model_config.radius_polynomial_resize[i] * powf(radius, power);
}
return return_value;
}
} // namespace
PalmFilterSample CreatePalmFilterSample(
const InProgressTouchEvdev& touch,
const base::TimeTicks& time,
const NeuralStylusPalmDetectionFilterModelConfig& model_config,
const PalmFilterDeviceInfo& dev_info) {
// radius_x and radius_y have been
// scaled by resolution already.
PalmFilterSample sample;
sample.time = time;
sample.major_radius = ScaledRadius(
std::max(touch.major, touch.minor) * dev_info.major_radius_res,
model_config);
if (dev_info.minor_radius_supported) {
sample.minor_radius = ScaledRadius(
std::min(touch.major, touch.minor) * dev_info.minor_radius_res,
model_config);
} else {
sample.minor_radius = ScaledRadius(touch.major, model_config);
}
// Nearest edge distance, in cm.
float nearest_x_edge = std::min(touch.x, dev_info.max_x - touch.x);
float nearest_y_edge = std::min(touch.y, dev_info.max_y - touch.y);
float normalized_x_edge = nearest_x_edge / dev_info.x_res;
float normalized_y_edge = nearest_y_edge / dev_info.y_res;
sample.edge = std::min(normalized_x_edge, normalized_y_edge);
sample.point =
gfx::PointF(touch.x / dev_info.x_res, touch.y / dev_info.y_res);
sample.tracking_id = touch.tracking_id;
sample.pressure = touch.pressure;
return sample;
}
PalmFilterStroke::PalmFilterStroke(size_t max_length)
: max_length_(max_length) {}
PalmFilterStroke::PalmFilterStroke(const PalmFilterStroke& other) = default;
PalmFilterStroke::PalmFilterStroke(PalmFilterStroke&& other) = default;
PalmFilterStroke& PalmFilterStroke::operator=(const PalmFilterStroke& other) =
default;
PalmFilterStroke& PalmFilterStroke::operator=(PalmFilterStroke&& other) =
default;
PalmFilterStroke::~PalmFilterStroke() {}
void PalmFilterStroke::AddSample(const PalmFilterSample& sample) {
samples_seen_++;
if (samples_.empty()) {
tracking_id_ = sample.tracking_id;
}
DCHECK_EQ(tracking_id_, sample.tracking_id);
samples_.push_back(sample);
AddToUnscaledCentroid(sample.point.OffsetFromOrigin());
while (samples_.size() > max_length_) {
AddToUnscaledCentroid(-samples_.front().point.OffsetFromOrigin());
samples_.pop_front();
}
}
void PalmFilterStroke::AddToUnscaledCentroid(const gfx::Vector2dF point) {
const gfx::Vector2dF corrected_point = point - unscaled_centroid_sum_error_;
const gfx::PointF new_unscaled_centroid =
unscaled_centroid_ + corrected_point;
unscaled_centroid_sum_error_ =
(new_unscaled_centroid - unscaled_centroid_) - corrected_point;
unscaled_centroid_ = new_unscaled_centroid;
}
gfx::PointF PalmFilterStroke::GetCentroid() const {
if (samples_.size() == 0) {
return gfx::PointF(0., 0.);
}
return gfx::ScalePoint(unscaled_centroid_, 1.f / samples_.size());
}
const std::deque<PalmFilterSample>& PalmFilterStroke::samples() const {
return samples_;
}
int PalmFilterStroke::tracking_id() const {
return tracking_id_;
}
uint64_t PalmFilterStroke::samples_seen() const {
return samples_seen_;
}
void PalmFilterStroke::SetTrackingId(int tracking_id) {
tracking_id_ = tracking_id;
}
float PalmFilterStroke::MaxMajorRadius() const {
float maximum = 0.0;
for (const auto& sample : samples_) {
maximum = std::max(maximum, sample.major_radius);
}
return maximum;
}
float PalmFilterStroke::BiggestSize() const {
float biggest = 0;
for (const auto& sample : samples_) {
float size;
if (sample.minor_radius <= 0) {
size = sample.major_radius * sample.major_radius;
} else {
size = sample.major_radius * sample.minor_radius;
}
biggest = std::max(biggest, size);
}
return biggest;
}
} // namespace ui
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