Index: ui/events/ozone/evdev/touch_noise/single_position_touch_noise_filter.cc |
diff --git a/ui/events/ozone/evdev/touch_noise/single_position_touch_noise_filter.cc b/ui/events/ozone/evdev/touch_noise/single_position_touch_noise_filter.cc |
deleted file mode 100644 |
index bd389e292a9fecd35733e72d3c3d19ed7702b0fb..0000000000000000000000000000000000000000 |
--- a/ui/events/ozone/evdev/touch_noise/single_position_touch_noise_filter.cc |
+++ /dev/null |
@@ -1,151 +0,0 @@ |
-// 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. |
- |
-#include "ui/events/ozone/evdev/touch_noise/single_position_touch_noise_filter.h" |
- |
-#include "base/logging.h" |
-#include "base/strings/stringprintf.h" |
- |
-namespace ui { |
- |
-namespace { |
- |
-// Max squared distance between fingers for the fingers to be considered in the |
-// same position. |
-const int kSamePositionMaxDistance2 = 2 * 2; |
- |
-// Max squared movement of a finger before it's no longer considered noise. |
-const int kNoiseMaxMovement2 = 2 * 2; |
- |
-// Min duration in milliseconds after which touches in the same position are |
-// considered noise. |
-const int kMinDurationMs = 2000; |
- |
-// Max duration in milliseconds to check for common positions with previous |
-// touches. |
-const int kMaxDurationMs = 4000; |
- |
-// Returns the squared distance between (|x1|, |y1|) and (|x2|, |y2|) |
-int Distance2(int x1, int y1, int x2, int y2) { |
- int offset_x = x2 - x1; |
- int offset_y = y2 - y1; |
- return offset_x * offset_x + offset_y * offset_y; |
-} |
- |
-} // namespace |
- |
-SinglePositionTouchNoiseFilter::SinglePositionTouchNoiseFilter() |
- : tracked_touches_start_(0), tracked_touches_end_(0) { |
- for (size_t i = 0; i < kNumTouchEvdevSlots; ++i) |
- tracked_slots_[i] = kNumTrackedTouches; |
-} |
- |
-void SinglePositionTouchNoiseFilter::Filter( |
- const std::vector<InProgressTouchEvdev>& touches, |
- base::TimeDelta time, |
- std::bitset<kNumTouchEvdevSlots>* slots_with_noise) { |
- // Forget old touches which will no longer be considered for overlap. |
- base::TimeDelta touch_cutoff = |
- time - base::TimeDelta::FromMilliseconds(kMaxDurationMs); |
- for (size_t i = tracked_touches_start_; i != tracked_touches_end_; |
- i = (i + 1) % kNumTrackedTouches) { |
- if (!tracked_touches_[i].valid) |
- continue; |
- if (tracked_touches_[i].end < touch_cutoff) |
- StopTrackingTouch(i); |
- } |
- |
- for (const InProgressTouchEvdev& touch : touches) { |
- size_t slot = touch.slot; |
- |
- bool arrived = touch.touching && !touch.was_touching; |
- bool departed = !touch.touching && touch.was_touching; |
- if (departed) |
- tracked_slots_[slot] = kNumTrackedTouches; |
- if (!touch.touching) |
- continue; |
- |
- // Track all new touches until they move too far. |
- if (arrived) |
- TrackTouch(touch, time); |
- |
- size_t t_ind = tracked_slots_[slot]; |
- if (t_ind != kNumTrackedTouches) { |
- tracked_touches_[t_ind].end = time; |
- // Stop tracking if touch moves more than sqrt(kNoiseMaxMovement2). |
- if (Distance2(touch.x, touch.y, tracked_touches_[t_ind].x, |
- tracked_touches_[t_ind].y) > kNoiseMaxMovement2) { |
- StopTrackingTouch(t_ind); |
- } else { |
- // Determine duration over which touches have been occuring in this |
- // position. |
- base::TimeDelta max_duration; |
- for (size_t i = tracked_touches_start_; i != tracked_touches_end_; |
- i = (i + 1) % kNumTrackedTouches) { |
- TrackedTouch* tracked_touch = &tracked_touches_[i]; |
- if (!tracked_touch->valid) |
- continue; |
- if (Distance2(touch.x, touch.y, tracked_touch->x, tracked_touch->y) <= |
- kSamePositionMaxDistance2) { |
- base::TimeDelta duration = time - tracked_touch->begin; |
- if (duration > max_duration) |
- max_duration = duration; |
- } |
- } |
- |
- if (max_duration.InMilliseconds() > kMinDurationMs) { |
- VLOG(2) << base::StringPrintf( |
- "Cancel tracking id %d, in position occurring for %ldms", |
- touch.tracking_id, max_duration.InMilliseconds()); |
- slots_with_noise->set(slot); |
- } |
- } |
- } |
- } |
-} |
- |
-void SinglePositionTouchNoiseFilter::StopTrackingTouch(size_t index) { |
- size_t slot = tracked_touches_[index].slot; |
- if (tracked_slots_[slot] == index) |
- tracked_slots_[slot] = kNumTrackedTouches; |
- tracked_touches_[index].valid = false; |
- |
- // If first touch is canceled, remove all dead touches. |
- if (index == tracked_touches_start_) { |
- while (!tracked_touches_[tracked_touches_start_].valid && |
- tracked_touches_start_ != tracked_touches_end_) { |
- tracked_touches_start_ = |
- (tracked_touches_start_ + 1) % kNumTrackedTouches; |
- } |
- } |
-} |
- |
-void SinglePositionTouchNoiseFilter::TrackTouch( |
- const InProgressTouchEvdev& touch, |
- base::TimeDelta time) { |
- size_t index = (tracked_touches_end_ + 1) % kNumTrackedTouches; |
- // If we would reach the start touch index, we cannot track any more touches. |
- if (index == tracked_touches_start_) |
- return; |
- |
- tracked_touches_end_ = index; |
- tracked_touches_[index].valid = true; |
- tracked_touches_[index].slot = touch.slot; |
- tracked_touches_[index].x = touch.x; |
- tracked_touches_[index].y = touch.y; |
- tracked_touches_[index].begin = time; |
- tracked_touches_[index].end = time; |
- tracked_slots_[touch.slot] = index; |
-} |
- |
-SinglePositionTouchNoiseFilter::SinglePositionTouchNoiseFilter::TrackedTouch:: |
- TrackedTouch() |
- : valid(false), slot(0), x(0), y(0) { |
-} |
- |
-SinglePositionTouchNoiseFilter::SinglePositionTouchNoiseFilter::TrackedTouch:: |
- ~TrackedTouch() { |
-} |
- |
-} // namespace ui |