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| 1 // Copyright 2015 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "ui/events/ozone/evdev/touch_noise/horizontally_aligned_touch_noise_fil
ter.h" |
| 6 |
| 7 #include <cmath> |
| 8 |
| 9 #include "base/logging.h" |
| 10 #include "base/strings/stringprintf.h" |
| 11 |
| 12 namespace ui { |
| 13 |
| 14 namespace { |
| 15 |
| 16 // The maximum horizontal distance between touches considered aligned. |
| 17 int kMaxDistance = 3; |
| 18 |
| 19 } // namespace |
| 20 |
| 21 void HorizontallyAlignedTouchNoiseFilter::Filter( |
| 22 const std::vector<InProgressTouchEvdev>& touches, |
| 23 base::TimeDelta time, |
| 24 std::bitset<kNumTouchEvdevSlots>* slots_with_noise) { |
| 25 for (const InProgressTouchEvdev& touch : touches) { |
| 26 // Only consider new touches. |
| 27 if (!touch.touching || touch.was_touching) |
| 28 continue; |
| 29 |
| 30 // Check if within kMaxDistance of an existing touch. |
| 31 for (const InProgressTouchEvdev& other_touch : touches) { |
| 32 if (touch.slot == other_touch.slot || !other_touch.touching) |
| 33 continue; |
| 34 if (std::abs(other_touch.x - touch.x) <= kMaxDistance) { |
| 35 VLOG(2) << base::StringPrintf( |
| 36 "Cancel tracking id %d, down at %ld at %f,%f near touch %d at " |
| 37 "%f,%f", |
| 38 touch.tracking_id, time.ToInternalValue(), touch.x, touch.y, |
| 39 other_touch.tracking_id, other_touch.x, other_touch.y); |
| 40 slots_with_noise->set(touch.slot); |
| 41 } |
| 42 } |
| 43 } |
| 44 } |
| 45 |
| 46 } // namespace ui |
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