Index: ui/events/ozone/evdev/touch_noise/horizontally_aligned_touch_noise_filter.cc |
diff --git a/ui/events/ozone/evdev/touch_noise/horizontally_aligned_touch_noise_filter.cc b/ui/events/ozone/evdev/touch_noise/horizontally_aligned_touch_noise_filter.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..def0af898ca0f0c20a560b2d8c114250f3edc8cb |
--- /dev/null |
+++ b/ui/events/ozone/evdev/touch_noise/horizontally_aligned_touch_noise_filter.cc |
@@ -0,0 +1,46 @@ |
+// 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/horizontally_aligned_touch_noise_filter.h" |
+ |
+#include <cmath> |
+ |
+#include "base/logging.h" |
+#include "base/strings/stringprintf.h" |
+ |
+namespace ui { |
+ |
+namespace { |
+ |
+// The maximum horizontal distance between touches considered aligned. |
+int kMaxDistance = 3; |
+ |
+} // namespace |
+ |
+void HorizontallyAlignedTouchNoiseFilter::Filter( |
+ const std::vector<InProgressTouchEvdev>& touches, |
+ base::TimeDelta time, |
+ std::bitset<kNumTouchEvdevSlots>* slots_with_noise) { |
+ for (const InProgressTouchEvdev& touch : touches) { |
+ // Only consider new touches. |
+ if (!touch.touching || touch.was_touching) |
+ continue; |
+ |
+ // Check if within kMaxDistance of an existing touch. |
+ for (const InProgressTouchEvdev& other_touch : touches) { |
+ if (touch.slot == other_touch.slot || !other_touch.touching) |
+ continue; |
+ if (std::abs(other_touch.x - touch.x) <= kMaxDistance) { |
+ VLOG(2) << base::StringPrintf( |
+ "Cancel tracking id %d, down at %ld at %f,%f near touch %d at " |
+ "%f,%f", |
+ touch.tracking_id, time.ToInternalValue(), touch.x, touch.y, |
+ other_touch.tracking_id, other_touch.x, other_touch.y); |
+ slots_with_noise->set(touch.slot); |
+ } |
+ } |
+ } |
+} |
+ |
+} // namespace ui |