| // Copyright (c) 2012 The Chromium OS 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 "gestures/include/immediate_interpreter.h" |
| |
| #include <algorithm> |
| #include <cmath> |
| #include <cstdlib> |
| #include <functional> |
| |
| #include "gestures/include/gestures.h" |
| #include "gestures/include/logging.h" |
| #include "gestures/include/util.h" |
| |
| using std::bind1st; |
| using std::for_each; |
| using std::make_pair; |
| using std::max; |
| using std::mem_fun; |
| using std::min; |
| |
| namespace gestures { |
| |
| namespace { |
| |
| float MaxMag(float a, float b) { |
| if (fabsf(a) > fabsf(b)) |
| return a; |
| return b; |
| } |
| float MinMag(float a, float b) { |
| if (fabsf(a) < fabsf(b)) |
| return a; |
| return b; |
| } |
| |
| } // namespace {} |
| |
| void TapRecord::NoteTouch(short the_id, const FingerState& fs) { |
| if (&fs == NULL) { |
| Err("Error! Bad FingerState!"); |
| return; |
| } |
| // New finger must be close enough to an existing finger |
| if (!touched_.empty()) { |
| bool reject_new_finger = true; |
| for (map<short, FingerState, kMaxTapFingers>::const_iterator it = |
| touched_.begin(), e = touched_.end(); it != e; ++it) { |
| const FingerState& existing_fs = (*it).second; |
| if (immediate_interpreter_->finger_metrics_->FingersCloseEnoughToGesture( |
| existing_fs, |
| fs)) { |
| reject_new_finger = false; |
| break; |
| } |
| } |
| if (reject_new_finger) |
| return; |
| } |
| touched_[the_id] = fs; |
| } |
| |
| void TapRecord::NoteRelease(short the_id) { |
| if (touched_.find(the_id) != touched_.end()) |
| released_.insert(the_id); |
| } |
| |
| void TapRecord::Remove(short the_id) { |
| min_tap_pressure_met_.erase(the_id); |
| min_cotap_pressure_met_.erase(the_id); |
| touched_.erase(the_id); |
| released_.erase(the_id); |
| } |
| |
| float TapRecord::CotapMinPressure() const { |
| return immediate_interpreter_->tap_min_pressure() * 0.5; |
| } |
| |
| void TapRecord::Update(const HardwareState& hwstate, |
| const HardwareState& prev_hwstate, |
| const set<short, kMaxTapFingers>& added, |
| const set<short, kMaxTapFingers>& removed, |
| const set<short, kMaxFingers>& dead) { |
| Log("Updating TapRecord."); |
| if (!t5r2_ && (hwstate.finger_cnt != hwstate.touch_cnt || |
| prev_hwstate.finger_cnt != prev_hwstate.touch_cnt)) { |
| // switch to T5R2 mode |
| t5r2_ = true; |
| t5r2_touched_size_ = touched_.size(); |
| t5r2_released_size_ = released_.size(); |
| } |
| if (t5r2_) { |
| short diff = static_cast<short>(hwstate.touch_cnt) - |
| static_cast<short>(prev_hwstate.touch_cnt); |
| if (diff > 0) |
| t5r2_touched_size_ += diff; |
| else if (diff < 0) |
| t5r2_released_size_ += -diff; |
| } |
| for (set<short, kMaxTapFingers>::const_iterator it = added.begin(), |
| e = added.end(); it != e; ++it) |
| Log("Added: %d", *it); |
| for (set<short, kMaxTapFingers>::const_iterator it = removed.begin(), |
| e = removed.end(); it != e; ++it) |
| Log("Removed: %d", *it); |
| for (set<short, kMaxFingers>::const_iterator it = dead.begin(), |
| e = dead.end(); it != e; ++it) |
| Log("Dead: %d", *it); |
| for_each(dead.begin(), dead.end(), |
| bind1st(mem_fun(&TapRecord::Remove), this)); |
| for (set<short, kMaxTapFingers>::const_iterator it = added.begin(), |
| e = added.end(); it != e; ++it) |
| NoteTouch(*it, *hwstate.GetFingerState(*it)); |
| for_each(removed.begin(), removed.end(), |
| bind1st(mem_fun(&TapRecord::NoteRelease), this)); |
| // Check if min tap/cotap pressure met yet |
| const float cotap_min_pressure = CotapMinPressure(); |
| for (map<short, FingerState, kMaxTapFingers>::iterator it = |
| touched_.begin(), e = touched_.end(); |
| it != e; ++it) { |
| const FingerState* fs = hwstate.GetFingerState((*it).first); |
| if (fs) { |
| if (fs->pressure >= immediate_interpreter_->tap_min_pressure()) |
| min_tap_pressure_met_.insert(fs->tracking_id); |
| if (fs->pressure >= cotap_min_pressure) { |
| min_cotap_pressure_met_.insert(fs->tracking_id); |
| if ((*it).second.pressure < cotap_min_pressure) { |
| // Update existing record, since the old one hadn't met the cotap |
| // pressure |
| (*it).second = *fs; |
| } |
| } |
| stime_t finger_age = hwstate.timestamp - |
| immediate_interpreter_->finger_origin_timestamp(fs->tracking_id); |
| if (finger_age > immediate_interpreter_->tap_max_finger_age()) |
| fingers_below_max_age_ = false; |
| } |
| } |
| Log("Done Updating TapRecord."); |
| } |
| |
| void TapRecord::Clear() { |
| min_tap_pressure_met_.clear(); |
| min_cotap_pressure_met_.clear(); |
| t5r2_ = false; |
| t5r2_touched_size_ = 0; |
| t5r2_released_size_ = 0; |
| fingers_below_max_age_ = true; |
| touched_.clear(); |
| released_.clear(); |
| } |
| |
| bool TapRecord::Moving(const HardwareState& hwstate, |
| const float dist_max) const { |
| const float cotap_min_pressure = CotapMinPressure(); |
| for (map<short, FingerState, kMaxTapFingers>::const_iterator it = |
| touched_.begin(), e = touched_.end(); it != e; ++it) { |
| const FingerState* fs = hwstate.GetFingerState((*it).first); |
| if (!fs) |
| continue; |
| // Only look for moving when current frame meets cotap pressure and |
| // our history contains a contact that's met cotap pressure. |
| if (fs->pressure < cotap_min_pressure || |
| (*it).second.pressure < cotap_min_pressure) |
| continue; |
| // Compute distance moved |
| float dist_x = fs->position_x - (*it).second.position_x; |
| float dist_y = fs->position_y - (*it).second.position_y; |
| // Respect WARP flags |
| if (fs->flags & GESTURES_FINGER_WARP_X_TAP_MOVE) |
| dist_x = 0.0; |
| if (fs->flags & GESTURES_FINGER_WARP_X_TAP_MOVE) |
| dist_y = 0.0; |
| |
| bool moving = |
| dist_x * dist_x + dist_y * dist_y > dist_max * dist_max; |
| Log("Moving? x %f y %f (%s)", dist_x, dist_y, moving ? "Yes" : "No"); |
| if (moving) |
| return true; |
| } |
| return false; |
| } |
| |
| bool TapRecord::Motionless(const HardwareState& hwstate, const HardwareState& |
| prev_hwstate, const float max_speed) const { |
| const float cotap_min_pressure = CotapMinPressure(); |
| for (map<short, FingerState, kMaxTapFingers>::const_iterator it = |
| touched_.begin(), e = touched_.end(); it != e; ++it) { |
| const FingerState* fs = hwstate.GetFingerState((*it).first); |
| const FingerState* prev_fs = prev_hwstate.GetFingerState((*it).first); |
| if (!fs || !prev_fs) |
| continue; |
| // Only look for moving when current frame meets cotap pressure and |
| // our history contains a contact that's met cotap pressure. |
| if (fs->pressure < cotap_min_pressure || |
| prev_fs->pressure < cotap_min_pressure) |
| continue; |
| // Compute distance moved |
| if (DistSq(*fs, *prev_fs) > max_speed * max_speed) |
| return false; |
| } |
| return true; |
| } |
| |
| bool TapRecord::TapBegan() const { |
| if (t5r2_) |
| return t5r2_touched_size_ > 0; |
| return !touched_.empty(); |
| } |
| |
| bool TapRecord::TapComplete() const { |
| Log("called TapComplete()"); |
| bool ret = false; |
| if (t5r2_) |
| ret = t5r2_touched_size_ && t5r2_touched_size_ == t5r2_released_size_; |
| else |
| ret = !touched_.empty() && (touched_.size() == released_.size()); |
| for (map<short, FingerState, kMaxTapFingers>::const_iterator |
| it = touched_.begin(), e = touched_.end(); it != e; ++it) |
| Log("touched_: %d", (*it).first); |
| for (set<short, kMaxTapFingers>::const_iterator it = released_.begin(), |
| e = released_.end(); it != e; ++it) |
| Log("released_: %d", *it); |
| Log("TapComplete() returning %d", ret); |
| return ret; |
| } |
| |
| bool TapRecord::MinTapPressureMet() const { |
| // True if any touching finger met minimum pressure |
| return t5r2_ || !min_tap_pressure_met_.empty(); |
| } |
| |
| bool TapRecord::FingersBelowMaxAge() const { |
| return fingers_below_max_age_; |
| } |
| |
| int TapRecord::TapType() const { |
| size_t touched_size = |
| t5r2_ ? t5r2_touched_size_ : min_cotap_pressure_met_.size(); |
| int ret = GESTURES_BUTTON_LEFT; |
| if (touched_size > 1) |
| ret = GESTURES_BUTTON_RIGHT; |
| if (touched_size == 3 && |
| immediate_interpreter_->three_finger_click_enable_.val_ && |
| (!t5r2_ || immediate_interpreter_->t5r2_three_finger_click_enable_.val_)) |
| ret = GESTURES_BUTTON_MIDDLE; |
| return ret; |
| } |
| |
| // static |
| ScrollEvent ScrollEvent::Add(const ScrollEvent& evt_a, |
| const ScrollEvent& evt_b) { |
| ScrollEvent ret = { evt_a.dx + evt_b.dx, |
| evt_a.dy + evt_b.dy, |
| evt_a.dt + evt_b.dt }; |
| return ret; |
| } |
| |
| void ScrollEventBuffer::Insert(float dx, float dy, float dt) { |
| head_ = (head_ + max_size_ - 1) % max_size_; |
| buf_[head_].dx = dx; |
| buf_[head_].dy = dy; |
| buf_[head_].dt = dt; |
| size_ = std::min(size_ + 1, max_size_); |
| } |
| |
| void ScrollEventBuffer::Clear() { |
| size_ = 0; |
| } |
| |
| const ScrollEvent& ScrollEventBuffer::Get(size_t offset) const { |
| if (offset >= size_) { |
| Err("Out of bounds access!"); |
| // avoid returning null pointer |
| static ScrollEvent dummy_event = { 0.0, 0.0, 0.0 }; |
| return dummy_event; |
| } |
| return buf_[(head_ + offset) % max_size_]; |
| } |
| |
| void ScrollEventBuffer::GetSpeedSq(float* dist_sq, float* dt) const { |
| float dx = 0.0; |
| float dy = 0.0; |
| *dt = 0.0; |
| for (size_t i = 0; i < Size(); i++) { |
| const ScrollEvent& evt = Get(i); |
| dx += evt.dx; |
| dy += evt.dy; |
| *dt += evt.dt; |
| } |
| *dist_sq = dx * dx + dy * dy; |
| } |
| |
| ImmediateInterpreter::ImmediateInterpreter(PropRegistry* prop_reg, |
| FingerMetrics* finger_metrics, |
| Tracer* tracer) |
| : Interpreter(NULL, tracer, false), |
| newest_prev_state_idx_(0), |
| button_type_(0), |
| sent_button_down_(false), |
| button_down_timeout_(0.0), |
| started_moving_time_(-1.0), |
| gs_changed_time_(-1.0), |
| finger_leave_time_(0.0), |
| tap_to_click_state_(kTtcIdle), |
| tap_to_click_state_entered_(0.0), |
| tap_record_(this), |
| last_movement_timestamp_(0.0), |
| last_swipe_timestamp_(0.0), |
| swipe_is_vertical_(false), |
| current_gesture_type_(kGestureTypeNull), |
| scroll_buffer_(15), |
| prev_result_high_pressure_change_(false), |
| finger_metrics_(finger_metrics), |
| pinch_guess_start_(-1.0), |
| pinch_locked_(false), |
| finger_seen_since_button_down_(false), |
| tap_enable_(prop_reg, "Tap Enable", true), |
| tap_paused_(prop_reg, "Tap Paused", false), |
| tap_timeout_(prop_reg, "Tap Timeout", 0.2), |
| inter_tap_timeout_(prop_reg, "Inter-Tap Timeout", 0.15), |
| tap_drag_delay_(prop_reg, "Tap Drag Delay", 0.1), |
| tap_drag_timeout_(prop_reg, "Tap Drag Timeout", 0.3), |
| tap_drag_enable_(prop_reg, "Tap Drag Enable", 0), |
| drag_lock_enable_(prop_reg, "Tap Drag Lock Enable", 0), |
| tap_drag_stationary_time_(prop_reg, "Tap Drag Stationary Time", 0.05), |
| tap_move_dist_(prop_reg, "Tap Move Distance", 2.0), |
| tap_min_pressure_(prop_reg, "Tap Minimum Pressure", 25.0), |
| tap_max_movement_(prop_reg, "Tap Maximum Movement", 0.0001), |
| tap_max_finger_age_(prop_reg, "Tap Maximum Finger Age", 1.2), |
| three_finger_click_enable_(prop_reg, "Three Finger Click Enable", 0), |
| zero_finger_click_enable_(prop_reg, "Zero Finger Click Enable", 1), |
| t5r2_three_finger_click_enable_(prop_reg, |
| "T5R2 Three Finger Click Enable", |
| 0), |
| change_move_distance_(prop_reg, "Change Min Move Distance", 3.0), |
| change_timeout_(prop_reg, "Change Timeout", 0.04), |
| evaluation_timeout_(prop_reg, "Evaluation Timeout", 0.2), |
| damp_scroll_min_movement_factor_(prop_reg, |
| "Damp Scroll Min Move Factor", |
| 0.2), |
| two_finger_pressure_diff_thresh_(prop_reg, |
| "Two Finger Pressure Diff Thresh", |
| 32.0), |
| two_finger_pressure_diff_factor_(prop_reg, |
| "Two Finger Pressure Diff Factor", |
| 1.65), |
| thumb_movement_factor_(prop_reg, "Thumb Movement Factor", 0.5), |
| thumb_eval_timeout_(prop_reg, "Thumb Evaluation Timeout", 0.06), |
| two_finger_scroll_distance_thresh_(prop_reg, |
| "Two Finger Scroll Distance Thresh", |
| 2.0), |
| three_finger_close_distance_thresh_(prop_reg, |
| "Three Finger Close Distance Thresh", |
| 50.0), |
| three_finger_swipe_distance_thresh_(prop_reg, |
| "Three Finger Swipe Distance Thresh", |
| 1.0), |
| three_finger_swipe_enable_(prop_reg, "Three Finger Swipe EnableX", 1), |
| max_pressure_change_(prop_reg, "Max Allowed Pressure Change Per Sec", |
| 800.0), |
| max_pressure_change_hysteresis_(prop_reg, |
| "Max Hysteresis Pressure Per Sec", |
| 600.0), |
| max_pressure_change_duration_(prop_reg, |
| "Max Pressure Change Duration", |
| 0.016), |
| scroll_stationary_finger_max_distance_( |
| prop_reg, "Scroll Stationary Finger Max Distance", 1.0), |
| bottom_zone_size_(prop_reg, "Bottom Zone Size", 10.0), |
| button_evaluation_timeout_(prop_reg, "Button Evaluation Timeout", 0.03), |
| keyboard_touched_timeval_high_(prop_reg, "Keyboard Touched Timeval High", |
| 0), |
| keyboard_touched_timeval_low_(prop_reg, "Keyboard Touched Timeval Low", |
| 0, this), |
| keyboard_touched_(0.0), |
| keyboard_palm_prevent_timeout_(prop_reg, "Keyboard Palm Prevent Timeout", |
| 0.5), |
| motion_tap_prevent_timeout_(prop_reg, "Motion Tap Prevent Timeout", |
| 0.05), |
| tapping_finger_min_separation_(prop_reg, "Tap Min Separation", 10.0), |
| vertical_scroll_snap_slope_(prop_reg, "Vertical Scroll Snap Slope", |
| tanf(DegToRad(50.0))), // 50 deg. from horiz. |
| horizontal_scroll_snap_slope_(prop_reg, "Horizontal Scroll Snap Slope", |
| tanf(DegToRad(30.0))), |
| no_pinch_guess_ratio_(prop_reg, "No-Pinch Guess Ratio", 50.0), |
| no_pinch_certain_ratio_(prop_reg, "No-Pinch Certain Ratio", 100.0), |
| pinch_noise_level_(prop_reg, "Pinch Noise Level", 1.0), |
| pinch_guess_min_movement_(prop_reg, "Pinch Guess Minimal Movement", 4.0), |
| pinch_certain_min_movement_(prop_reg, |
| "Pinch Certain Minimal Movement", 8.0), |
| pinch_enable_(prop_reg, "Pinch Enable", 1.0), |
| fling_buffer_depth_(prop_reg, "Fling Buffer Depth", 3), |
| fling_buffer_suppress_zero_length_scrolls_( |
| prop_reg, "Fling Buffer Suppress Zero Length Scrolls", 0), |
| fling_buffer_min_avg_speed_(prop_reg, |
| "Fling Buffer Min Avg Speed", |
| 10.0), |
| right_click_start_time_diff_(prop_reg, |
| "Right Click Start Time Diff Thresh", |
| 0.5), |
| right_click_second_finger_age_(prop_reg, |
| "Right Click Second Finger Age Thresh", |
| 1.0) { |
| InitName(); |
| memset(prev_states_, 0, sizeof(prev_states_)); |
| if (!finger_metrics_) { |
| test_finger_metrics_.reset(new FingerMetrics(prop_reg)); |
| finger_metrics_ = test_finger_metrics_.get(); |
| } |
| } |
| |
| ImmediateInterpreter::~ImmediateInterpreter() { |
| for (size_t i = 0; i < arraysize(prev_states_); i++) { |
| if (PrevState(i)->fingers) { |
| free(PrevState(i)->fingers); |
| PrevState(i)->fingers = NULL; |
| } |
| } |
| } |
| |
| Gesture* ImmediateInterpreter::SyncInterpretImpl(HardwareState* hwstate, |
| stime_t* timeout) { |
| if (!PrevState(0)->fingers) { |
| Err("Must call SetHardwareProperties() before Push()."); |
| return 0; |
| } |
| |
| FillOriginInfo(*hwstate); |
| result_.type = kGestureTypeNull; |
| const bool same_fingers = PrevState(0)->SameFingersAs(*hwstate) && |
| (hwstate->buttons_down == PrevState(0)->buttons_down); |
| if (!same_fingers) { |
| // Fingers changed, do nothing this time |
| ResetSameFingersState(hwstate->timestamp); |
| FillStartPositions(*hwstate); |
| UpdatePinchState(*hwstate, true); |
| } |
| |
| if (hwstate->finger_cnt < PrevState(0)->finger_cnt) |
| finger_leave_time_ = hwstate->timestamp; |
| |
| UpdatePointingFingers(*hwstate); |
| UpdateThumbState(*hwstate); |
| set<short, kMaxGesturingFingers> gs_fingers = GetGesturingFingers(*hwstate); |
| if (gs_fingers != prev_gs_fingers_) |
| gs_changed_time_ = hwstate->timestamp; |
| |
| UpdateStartedMovingTime(*hwstate, gs_fingers); |
| UpdateButtons(*hwstate, timeout); |
| UpdateTapGesture(hwstate, |
| gs_fingers, |
| same_fingers, |
| hwstate->timestamp, |
| timeout); |
| |
| UpdateCurrentGestureType(*hwstate, gs_fingers); |
| if (result_.type == kGestureTypeNull) |
| FillResultGesture(*hwstate, gs_fingers); |
| |
| // Prevent moves while in a tap |
| if ((tap_to_click_state_ == kTtcFirstTapBegan || |
| tap_to_click_state_ == kTtcSubsequentTapBegan) && |
| result_.type == kGestureTypeMove) |
| result_.type = kGestureTypeNull; |
| |
| SetPrevState(*hwstate); |
| prev_gs_fingers_ = gs_fingers; |
| prev_result_ = result_; |
| prev_gesture_type_ = current_gesture_type_; |
| return result_.type != kGestureTypeNull ? &result_ : NULL; |
| } |
| |
| Gesture* ImmediateInterpreter::HandleTimerImpl(stime_t now, stime_t* timeout) { |
| result_.type = kGestureTypeNull; |
| // Tap-to-click always aborts when real button(s) are being used, so we |
| // don't need to worry about conflicts with these two types of callback. |
| UpdateButtonsTimeout(now); |
| UpdateTapGesture(NULL, |
| set<short, kMaxGesturingFingers>(), |
| false, |
| now, |
| timeout); |
| return result_.type != kGestureTypeNull ? &result_ : NULL; |
| } |
| |
| void ImmediateInterpreter::FillOriginInfo( |
| const HardwareState& hwstate) { |
| RemoveMissingIdsFromMap(&origin_timestamps_, hwstate); |
| for (size_t i = 0; i < hwstate.finger_cnt; i++) { |
| const FingerState& fs = hwstate.fingers[i]; |
| if (MapContainsKey(origin_timestamps_, fs.tracking_id)) |
| continue; |
| origin_timestamps_[fs.tracking_id] = hwstate.timestamp; |
| } |
| } |
| |
| void ImmediateInterpreter::ResetSameFingersState(stime_t now) { |
| pointing_.clear(); |
| fingers_.clear(); |
| start_positions_.clear(); |
| moving_.clear(); |
| changed_time_ = now; |
| } |
| |
| void ImmediateInterpreter::UpdatePointingFingers(const HardwareState& hwstate) { |
| for (size_t i = 0; i < hwstate.finger_cnt; i++) { |
| if (hwstate.fingers[i].flags & GESTURES_FINGER_PALM) |
| pointing_.erase(hwstate.fingers[i].tracking_id); |
| else |
| pointing_.insert(hwstate.fingers[i].tracking_id); |
| } |
| fingers_ = pointing_; |
| } |
| |
| float ImmediateInterpreter::DistanceTravelledSq(const FingerState& fs) const { |
| Point delta = FingerTraveledVector(fs); |
| return delta.x_ * delta.x_ + delta.y_ * delta.y_; |
| } |
| |
| ImmediateInterpreter::Point ImmediateInterpreter::FingerTraveledVector( |
| const FingerState& fs) const { |
| if (!MapContainsKey(start_positions_, fs.tracking_id)) |
| return Point(0.0f, 0.0f); |
| const Point& start = start_positions_[fs.tracking_id]; |
| float dx = fs.position_x - start.x_; |
| float dy = fs.position_y - start.y_; |
| return Point(dx, dy); |
| } |
| |
| float ImmediateInterpreter::TwoFingerDistanceSq( |
| const HardwareState& hwstate) const { |
| if (fingers_.size() == 2) { |
| const FingerState* finger_a = hwstate.GetFingerState(*fingers_.begin()); |
| const FingerState* finger_b = hwstate.GetFingerState(*(fingers_.begin()+1)); |
| if (finger_a == NULL || finger_b == NULL) { |
| Err("Finger unexpectedly NULL"); |
| return -1; |
| } |
| return DistSq(*finger_a, *finger_b); |
| } else { |
| return -1; |
| } |
| } |
| |
| // Updates thumb_ below. |
| void ImmediateInterpreter::UpdateThumbState(const HardwareState& hwstate) { |
| // Remove old ids from thumb_ |
| RemoveMissingIdsFromMap(&thumb_, hwstate); |
| float min_pressure = INFINITY; |
| const FingerState* min_fs = NULL; |
| for (size_t i = 0; i < hwstate.finger_cnt; i++) { |
| const FingerState& fs = hwstate.fingers[i]; |
| if (fs.flags & GESTURES_FINGER_PALM) |
| continue; |
| if (fs.pressure < min_pressure) { |
| min_pressure = fs.pressure; |
| min_fs = &fs; |
| } |
| } |
| if (!min_fs) { |
| // Only palms on the touchpad |
| return; |
| } |
| float thumb_dist_sq_thresh = DistanceTravelledSq(*min_fs) * |
| thumb_movement_factor_.val_ * thumb_movement_factor_.val_; |
| // Make all large-pressure contacts located below the min-pressure |
| // contact as thumbs. |
| for (size_t i = 0; i < hwstate.finger_cnt; i++) { |
| const FingerState& fs = hwstate.fingers[i]; |
| if (fs.flags & GESTURES_FINGER_PALM) |
| continue; |
| if (fs.pressure > min_pressure + two_finger_pressure_diff_thresh_.val_ && |
| fs.pressure > min_pressure * two_finger_pressure_diff_factor_.val_ && |
| fs.position_y > min_fs->position_y && |
| DistanceTravelledSq(fs) <= thumb_dist_sq_thresh) { |
| if (!MapContainsKey(thumb_, fs.tracking_id)) |
| thumb_[fs.tracking_id] = hwstate.timestamp; |
| } else if ((MapContainsKey(thumb_, fs.tracking_id) && |
| hwstate.timestamp < |
| max(started_moving_time_, |
| thumb_[fs.tracking_id]) + thumb_eval_timeout_.val_) || |
| (DistanceTravelledSq(fs) > thumb_dist_sq_thresh && |
| fs.tracking_id != min_fs->tracking_id)) { |
| thumb_.erase(fs.tracking_id); |
| } |
| } |
| for (map<short, stime_t, kMaxFingers>::const_iterator it = thumb_.begin(); |
| it != thumb_.end(); ++it) |
| pointing_.erase((*it).first); |
| } |
| |
| bool ImmediateInterpreter::KeyboardRecentlyUsed(stime_t now) const { |
| // For tests, values of 0 mean keyboard not used recently. |
| if (keyboard_touched_ == 0.0) |
| return false; |
| // Sanity check. If keyboard_touched_ is more than 10 seconds away from now, |
| // ignore it. |
| if (fabsf(now - keyboard_touched_) > 10) |
| return false; |
| |
| return keyboard_touched_ + keyboard_palm_prevent_timeout_.val_ > now; |
| } |
| |
| namespace { |
| struct GetGesturingFingersCompare { |
| // Returns true if finger_a is strictly closer to keyboard than finger_b |
| bool operator()(const FingerState* finger_a, const FingerState* finger_b) { |
| return finger_a->position_y < finger_b->position_y; |
| } |
| }; |
| } // namespace {} |
| |
| set<short, kMaxGesturingFingers> ImmediateInterpreter::GetGesturingFingers( |
| const HardwareState& hwstate) const { |
| // We support up to kMaxGesturingFingers finger gestures |
| if (pointing_.size() <= kMaxGesturingFingers) |
| return pointing_; |
| |
| const FingerState* fs[hwstate.finger_cnt]; |
| for (size_t i = 0; i < hwstate.finger_cnt; ++i) |
| fs[i] = &hwstate.fingers[i]; |
| |
| // Pull the kMaxSize FingerStates w/ the lowest position_y to the |
| // front of fs[]. |
| GetGesturingFingersCompare compare; |
| set<short, kMaxGesturingFingers> ret; |
| size_t sorted_cnt; |
| if (hwstate.finger_cnt > kMaxGesturingFingers) { |
| std::partial_sort(fs, fs + kMaxGesturingFingers, fs + hwstate.finger_cnt, |
| compare); |
| sorted_cnt = kMaxGesturingFingers; |
| } else { |
| std::sort(fs, fs + hwstate.finger_cnt, compare); |
| sorted_cnt = hwstate.finger_cnt; |
| } |
| for (size_t i = 0; i < sorted_cnt; i++) |
| ret.insert(fs[i]->tracking_id); |
| return ret; |
| } |
| |
| void ImmediateInterpreter::UpdateCurrentGestureType( |
| const HardwareState& hwstate, |
| const set<short, kMaxGesturingFingers>& gs_fingers) { |
| |
| size_t num_gesturing = gs_fingers.size(); |
| |
| // Physical button or tap overrides current gesture state |
| if (sent_button_down_ || tap_to_click_state_ == kTtcDrag) { |
| current_gesture_type_ = kGestureTypeMove; |
| return; |
| } |
| |
| // current gesture state machine |
| switch (current_gesture_type_) { |
| case kGestureTypeContactInitiated: |
| case kGestureTypeButtonsChange: |
| break; |
| |
| case kGestureTypeScroll: |
| case kGestureTypeSwipe: |
| // If a gesturing finger just left, do fling/lift |
| for (set<short, kMaxGesturingFingers>::const_iterator |
| it = prev_gs_fingers_.begin(), |
| e = prev_gs_fingers_.end(); |
| it != e; ++it) { |
| if (!hwstate.GetFingerState(*it)) { |
| Log("Found a finger lifting during a scroll!!!!!!!!!"); |
| current_gesture_type_ = |
| current_gesture_type_ == kGestureTypeScroll ? |
| kGestureTypeFling : kGestureTypeSwipeLift; |
| return; |
| } |
| } |
| // fallthrough |
| case kGestureTypeSwipeLift: |
| case kGestureTypeFling: |
| case kGestureTypeMove: |
| case kGestureTypeNull: |
| // When a finger leaves, we hold the gesture processing for |
| // change_timeout_ time. |
| if (hwstate.timestamp < finger_leave_time_ + change_timeout_.val_) { |
| current_gesture_type_ = kGestureTypeNull; |
| return; |
| } |
| |
| // Scrolling detection for T5R2 devices |
| if ((hw_props_.supports_t5r2 || hw_props_.support_semi_mt) && |
| (hwstate.touch_cnt > 2)) { |
| current_gesture_type_ = kGestureTypeScroll; |
| return; |
| } |
| |
| // Finger gesture decision process |
| if (num_gesturing == 0) { |
| current_gesture_type_ = kGestureTypeNull; |
| } else if (num_gesturing == 1) { |
| current_gesture_type_ = kGestureTypeMove; |
| } else { |
| if (changed_time_ > started_moving_time_ || |
| hwstate.timestamp - max(started_moving_time_, gs_changed_time_) < |
| evaluation_timeout_.val_ || |
| current_gesture_type_ == kGestureTypeNull) { |
| if (num_gesturing == 2) { |
| const FingerState* fingers[] = { |
| hwstate.GetFingerState(*gs_fingers.begin()), |
| hwstate.GetFingerState(*(gs_fingers.begin() + 1)) |
| }; |
| if (!fingers[0] || !fingers[1]) { |
| Err("Unable to find gesturing fingers!"); |
| return; |
| } |
| // See if two pointers are close together |
| bool potential_two_finger_gesture = |
| TwoFingersGesturing(*fingers[0], *fingers[1]); |
| if (!potential_two_finger_gesture) { |
| current_gesture_type_ = kGestureTypeMove; |
| } else { |
| current_gesture_type_ = |
| GetTwoFingerGestureType(*fingers[0], *fingers[1]); |
| } |
| } else if (num_gesturing == 3) { |
| const FingerState* fingers[] = { |
| hwstate.GetFingerState(*gs_fingers.begin()), |
| hwstate.GetFingerState(*(gs_fingers.begin() + 1)), |
| hwstate.GetFingerState(*(gs_fingers.begin() + 2)) |
| }; |
| if (!fingers[0] || !fingers[1] || !fingers[2]) { |
| Err("Unable to find gesturing fingers!"); |
| return; |
| } |
| current_gesture_type_ = GetThreeFingerGestureType(fingers); |
| if (current_gesture_type_ == kGestureTypeSwipe) |
| last_swipe_timestamp_ = hwstate.timestamp; |
| } else { |
| Log("TODO(adlr): support > 3 finger gestures."); |
| } |
| } |
| } |
| |
| if ((current_gesture_type_ == kGestureTypeMove || |
| current_gesture_type_ == kGestureTypeNull) && |
| (pinch_enable_.val_ && !hw_props_.support_semi_mt)) { |
| bool do_pinch = UpdatePinchState(hwstate, false); |
| if(do_pinch) { |
| current_gesture_type_ = kGestureTypePinch; |
| } |
| } |
| break; |
| |
| case kGestureTypePinch: |
| if (fingers_.size() == 2) { |
| return; |
| } else { |
| current_gesture_type_ = kGestureTypeNull; |
| } |
| break; |
| } |
| } |
| |
| bool ImmediateInterpreter::UpdatePinchState( |
| const HardwareState& hwstate, bool reset) { |
| |
| // perform reset to "don't know" state |
| if (reset) { |
| pinch_guess_start_ = -1.0f; |
| pinch_locked_ = false; |
| two_finger_start_distance_ = -1.0f; |
| return false; |
| } |
| |
| // once locked stay locked until reset. |
| if (pinch_locked_) { |
| return false; |
| } |
| |
| // check if we have two valid fingers |
| if (fingers_.size() != 2) { |
| return false; |
| } |
| const FingerState* finger1 = hwstate.GetFingerState(*fingers_.begin()); |
| const FingerState* finger2 = hwstate.GetFingerState(*(fingers_.begin()+1)); |
| if (finger1 == NULL || finger2 == NULL) { |
| Err("Finger unexpectedly NULL"); |
| return false; |
| } |
| |
| // assign the bottom finger to finger2 |
| if (finger1->position_y > finger2->position_y) { |
| std::swap(finger1, finger2); |
| } |
| |
| // Calculate start distance between fingers and cache value |
| if (two_finger_start_distance_ < 0) { |
| two_finger_start_distance_ = sqrtf(TwoFingerDistanceSq(hwstate)); |
| } |
| |
| // Check if the two fingers have start positions |
| if (!MapContainsKey(start_positions_, finger1->tracking_id) || |
| !MapContainsKey(start_positions_, finger2->tracking_id)) { |
| return false; |
| } |
| |
| // Pinch gesture detection |
| // |
| // The pinch gesture detection will try to make a guess about whether a pinch |
| // or not-a-pinch is performed. If the guess stays valid for a specific time |
| // (slow but consistent movement) or we get a certain decision (fast |
| // gesturing) the decision is locked until the state is reset. |
| // * A high ratio of the traveled distances between fingers indicates |
| // that a pinch is NOT performed. |
| // * Strong movement of both fingers in opposite directions indicates |
| // that a pinch IS performed. |
| |
| Point delta1 = FingerTraveledVector(*finger1); |
| Point delta2 = FingerTraveledVector(*finger2); |
| |
| // dot product. dot < 0 if fingers move away from each other. |
| float dot = delta1.x_ * delta2.x_ + delta1.y_ * delta2.y_; |
| // squared distances both finger have been traveled. |
| float d1sq = delta1.x_ * delta1.x_ + delta1.y_ * delta1.y_; |
| float d2sq = delta2.x_ * delta2.x_ + delta2.y_ * delta2.y_; |
| // ratio between distances. High value when fingers move |
| float ratio = d1sq > d2sq ? d2sq / d1sq : d1sq / d2sq; |
| |
| // true if movement is not strong enough to be distinguished from noise. |
| bool movement_below_noise = (d1sq + d2sq < 2.0*pinch_noise_level_.val_); |
| |
| // guesses if a pinch is being performed or not. |
| double guess_ratio = no_pinch_guess_ratio_.val_; |
| double guess_min_mov = pinch_guess_min_movement_.val_; |
| guess_min_mov *= guess_min_mov; |
| bool no_pinch_guess = (ratio > guess_ratio); |
| bool pinch_guess = d1sq > guess_min_mov && d2sq > guess_min_mov && dot < 0; |
| |
| // Thumb is in dampened zone: Only allow inward pinch |
| if (FingerInDampenedZone(*finger2)) { |
| no_pinch_guess |= (delta2.y_ > 0); |
| pinch_guess &= (delta2.y_ < 0); |
| } |
| |
| // do state transitions and final decision |
| if (pinch_guess_start_ < 0) { |
| // "Don't Know"-state |
| |
| // Determine guess. |
| if (!movement_below_noise) { |
| if (no_pinch_guess && !pinch_guess) { |
| pinch_guess_ = false; |
| pinch_guess_start_ = hwstate.timestamp; |
| } |
| if (pinch_guess && !no_pinch_guess) { |
| pinch_guess_ = true; |
| pinch_guess_start_ = hwstate.timestamp; |
| } |
| } |
| } else { |
| // "Guessed"-state |
| |
| // suppress cursor movement when we guess a pinch gesture |
| if (pinch_guess_) { |
| for (size_t i = 0; i < hwstate.finger_cnt; ++i) { |
| FingerState* finger_state = &hwstate.fingers[i]; |
| finger_state->flags |= GESTURES_FINGER_WARP_X; |
| finger_state->flags |= GESTURES_FINGER_WARP_Y; |
| } |
| } |
| |
| // Go back to "Don't Know"-state if guess is no longer valid |
| if (pinch_guess_ != pinch_guess || |
| pinch_guess_ == no_pinch_guess || |
| movement_below_noise) { |
| pinch_guess_start_ = -1.0f; |
| return false; |
| } |
| |
| // certain decisions if pinch is being performed or not |
| double cert_ratio = no_pinch_certain_ratio_.val_; |
| double cert_min_mov = pinch_certain_min_movement_.val_; |
| cert_min_mov *= cert_min_mov; |
| bool no_pinch_certain = d1sq + d2sq > cert_min_mov && (ratio > cert_ratio); |
| bool pinch_certain = d1sq > cert_min_mov && d2sq > cert_min_mov && dot < 0; |
| |
| // guessed for long enough or certain decision was made: lock |
| if (hwstate.timestamp - pinch_guess_start_ > 0.05 || |
| pinch_guess_ == pinch_certain || |
| pinch_guess_ != no_pinch_certain) { |
| pinch_locked_ = true; |
| return pinch_guess_; |
| } |
| } |
| |
| return false; |
| } |
| |
| bool ImmediateInterpreter::TwoFingersGesturing( |
| const FingerState& finger1, |
| const FingerState& finger2) const { |
| // Make sure distance between fingers isn't too great |
| if (!finger_metrics_->FingersCloseEnoughToGesture(finger1, finger2)) |
| return false; |
| |
| // Next, if two fingers are moving a lot, they are gesturing together. |
| if (started_moving_time_ > changed_time_) { |
| // Fingers are moving |
| float dist1_sq = DistanceTravelledSq(finger1); |
| float dist2_sq = DistanceTravelledSq(finger2); |
| if (thumb_movement_factor_.val_ * thumb_movement_factor_.val_ * |
| max(dist1_sq, dist2_sq) < min(dist1_sq, dist2_sq)) { |
| return true; |
| } |
| } |
| |
| // Make sure the pressure difference isn't too great for vertically |
| // aligned contacts |
| float pdiff = fabsf(finger1.pressure - finger2.pressure); |
| float xdist = fabsf(finger1.position_x - finger2.position_x); |
| float ydist = fabsf(finger1.position_y - finger2.position_y); |
| if (pdiff > two_finger_pressure_diff_thresh_.val_ && ydist > xdist) |
| return false; |
| |
| const float kMin2fDistThreshSq = tapping_finger_min_separation_.val_ * |
| tapping_finger_min_separation_.val_; |
| float dist_sq = xdist * xdist + ydist * ydist; |
| // Make sure distance between fingers isn't too small |
| if ((dist_sq < kMin2fDistThreshSq) && |
| !(finger1.flags & GESTURES_FINGER_MERGE)) |
| return false; |
| |
| // Next, if fingers are vertically aligned and one is in the bottom zone, |
| // consider that one a resting thumb (thus, do not scroll/right click) |
| if (xdist < ydist && (FingerInDampenedZone(finger1) || |
| FingerInDampenedZone(finger2))) |
| return false; |
| return true; |
| } |
| |
| GestureType ImmediateInterpreter::GetTwoFingerGestureType( |
| const FingerState& finger1, |
| const FingerState& finger2) { |
| if (!MapContainsKey(start_positions_, finger1.tracking_id) || |
| !MapContainsKey(start_positions_, finger2.tracking_id)) |
| return kGestureTypeNull; |
| |
| // Compute distance traveled since fingers changed for each finger |
| float dx1 = finger1.position_x - start_positions_[finger1.tracking_id].x_; |
| float dy1 = finger1.position_y - start_positions_[finger1.tracking_id].y_; |
| float dx2 = finger2.position_x - start_positions_[finger2.tracking_id].x_; |
| float dy2 = finger2.position_y - start_positions_[finger2.tracking_id].y_; |
| |
| float large_dx = MaxMag(dx1, dx2); |
| float large_dy = MaxMag(dy1, dy2); |
| float small_dx = MinMag(dx1, dx2); |
| float small_dy = MinMag(dy1, dy2); |
| |
| bool dampened_zone_occupied = false; |
| // movements of the finger in the dampened zone. If there are multiple |
| // fingers in the dampened zone, dx is min(dx_1, dx_2), dy is min(dy_1, dy_2). |
| float damp_dx = INFINITY; |
| float damp_dy = INFINITY; |
| float non_damp_dx = 0.0; |
| float non_damp_dy = 0.0; |
| if (FingerInDampenedZone(finger1) || |
| (finger1.flags & GESTURES_FINGER_POSSIBLE_PALM)) { |
| dampened_zone_occupied = true; |
| damp_dx = dx1; |
| damp_dy = dy1; |
| non_damp_dx = dx2; |
| non_damp_dy = dy2; |
| } |
| if (FingerInDampenedZone(finger2) || |
| (finger2.flags & GESTURES_FINGER_POSSIBLE_PALM)) { |
| dampened_zone_occupied = true; |
| damp_dx = MinMag(damp_dx, dx2); |
| damp_dy = MinMag(damp_dy, dy2); |
| non_damp_dx = MaxMag(non_damp_dx, dx1); |
| non_damp_dy = MaxMag(non_damp_dy, dy1); |
| } |
| |
| if (fabsf(large_dx) > fabsf(large_dy)) { |
| // consider horizontal scroll |
| if (fabsf(large_dx) < two_finger_scroll_distance_thresh_.val_) |
| return kGestureTypeNull; |
| if (fabsf(small_dx) < scroll_stationary_finger_max_distance_.val_) |
| small_dx = 0.0; |
| if (large_dx * small_dx < 0.0) |
| return kGestureTypeMove; // not same direction |
| if (dampened_zone_occupied) { |
| // Require damp to move at least some amount with the other finger |
| if (fabsf(damp_dx) < |
| damp_scroll_min_movement_factor_.val_ * fabsf(non_damp_dx)) { |
| return kGestureTypeMove; |
| } |
| } |
| return kGestureTypeScroll; |
| } else { |
| // consider vertical scroll |
| if (fabsf(large_dy) < two_finger_scroll_distance_thresh_.val_) |
| return kGestureTypeNull; |
| if (fabsf(small_dy) < scroll_stationary_finger_max_distance_.val_) |
| small_dy = 0.0; |
| if (large_dy * small_dy < 0.0) |
| return kGestureTypeMove; |
| if (dampened_zone_occupied) { |
| // Require damp to move at least some amount with the other finger |
| if (fabsf(damp_dy) < |
| damp_scroll_min_movement_factor_.val_ * fabsf(non_damp_dy)) { |
| return kGestureTypeMove; |
| } |
| } |
| return kGestureTypeScroll; |
| } |
| } |
| |
| GestureType ImmediateInterpreter::GetThreeFingerGestureType( |
| const FingerState* const fingers[3]) { |
| const FingerState* x_fingers[] = { fingers[0], fingers[1], fingers[2] }; |
| const FingerState* y_fingers[] = { fingers[0], fingers[1], fingers[2] }; |
| qsort(x_fingers, 3, sizeof(*x_fingers), CompareX<FingerState>); |
| qsort(y_fingers, 3, sizeof(*y_fingers), CompareY<FingerState>); |
| |
| bool horizontal = |
| (x_fingers[2]->position_x - x_fingers[0]->position_x) >= |
| (y_fingers[2]->position_y - y_fingers[0]->position_y); |
| const FingerState* min_finger = horizontal ? x_fingers[0] : y_fingers[0]; |
| const FingerState* center_finger = horizontal ? x_fingers[1] : y_fingers[1]; |
| const FingerState* max_finger = horizontal ? x_fingers[2] : y_fingers[2]; |
| |
| if (DistSq(*min_finger, *max_finger) > |
| three_finger_close_distance_thresh_.val_ * |
| three_finger_close_distance_thresh_.val_) { |
| return kGestureTypeNull; |
| } |
| |
| float dx[] = { |
| min_finger->position_x - start_positions_[min_finger->tracking_id].x_, |
| center_finger->position_x - start_positions_[center_finger->tracking_id].x_, |
| max_finger->position_x - start_positions_[max_finger->tracking_id].x_ |
| }; |
| float dy[] = { |
| min_finger->position_y - start_positions_[min_finger->tracking_id].y_, |
| center_finger->position_y - start_positions_[center_finger->tracking_id].y_, |
| max_finger->position_y - start_positions_[max_finger->tracking_id].y_ |
| }; |
| // pick horizontal or vertical |
| float *deltas = fabsf(dx[0]) > fabsf(dy[0]) ? dx : dy; |
| swipe_is_vertical_ = deltas == dy; |
| |
| // All three fingers must move in the same direction. |
| if ((deltas[0] > 0 && !(deltas[1] > 0 && deltas[2] > 0)) || |
| (deltas[0] < 0 && !(deltas[1] < 0 && deltas[2] < 0))) { |
| return kGestureTypeNull; |
| } |
| |
| // All three fingers must have traveled far enough. |
| if (fabsf(deltas[0]) < three_finger_swipe_distance_thresh_.val_ || |
| fabsf(deltas[1]) < three_finger_swipe_distance_thresh_.val_ || |
| fabsf(deltas[2]) < three_finger_swipe_distance_thresh_.val_) { |
| return kGestureTypeNull; |
| } |
| |
| return kGestureTypeSwipe; |
| } |
| |
| const char* ImmediateInterpreter::TapToClickStateName(TapToClickState state) { |
| switch (state) { |
| case kTtcIdle: return "Idle"; |
| case kTtcFirstTapBegan: return "FirstTapBegan"; |
| case kTtcTapComplete: return "TapComplete"; |
| case kTtcSubsequentTapBegan: return "SubsequentTapBegan"; |
| case kTtcDrag: return "Drag"; |
| case kTtcDragRelease: return "DragRelease"; |
| case kTtcDragRetouch: return "DragRetouch"; |
| default: return "<unknown>"; |
| } |
| } |
| |
| stime_t ImmediateInterpreter::TimeoutForTtcState(TapToClickState state) { |
| switch (state) { |
| case kTtcIdle: return tap_timeout_.val_; |
| case kTtcFirstTapBegan: return tap_timeout_.val_; |
| case kTtcTapComplete: return inter_tap_timeout_.val_; |
| case kTtcSubsequentTapBegan: return tap_timeout_.val_; |
| case kTtcDrag: return tap_timeout_.val_; |
| case kTtcDragRelease: return tap_drag_timeout_.val_; |
| case kTtcDragRetouch: return tap_timeout_.val_; |
| default: |
| Log("Unknown state!"); |
| return 0.0; |
| } |
| } |
| |
| void ImmediateInterpreter::SetTapToClickState(TapToClickState state, |
| stime_t now) { |
| if (tap_to_click_state_ != state) { |
| tap_to_click_state_ = state; |
| tap_to_click_state_entered_ = now; |
| } |
| } |
| |
| void ImmediateInterpreter::UpdateTapGesture( |
| const HardwareState* hwstate, |
| const set<short, kMaxGesturingFingers>& gs_fingers, |
| const bool same_fingers, |
| stime_t now, |
| stime_t* timeout) { |
| unsigned down = 0; |
| unsigned up = 0; |
| UpdateTapState(hwstate, gs_fingers, same_fingers, now, &down, &up, timeout); |
| if (down == 0 && up == 0) { |
| Log("No tap gesture"); |
| return; |
| } |
| Log("Yes tap gesture"); |
| result_ = Gesture(kGestureButtonsChange, |
| PrevState(0)->timestamp, |
| now, |
| down, |
| up); |
| } |
| |
| void ImmediateInterpreter::UpdateTapState( |
| const HardwareState* hwstate, |
| const set<short, kMaxGesturingFingers>& gs_fingers, |
| const bool same_fingers, |
| stime_t now, |
| unsigned* buttons_down, |
| unsigned* buttons_up, |
| stime_t* timeout) { |
| if (tap_to_click_state_ == kTtcIdle && (!tap_enable_.val_ || |
| tap_paused_.val_)) |
| return; |
| Log("Entering UpdateTapState"); |
| |
| set<short, kMaxGesturingFingers> tap_gs_fingers; |
| |
| bool cancel_tapping = false; |
| if (hwstate) { |
| for (int i = 0; i < hwstate->finger_cnt; ++i) { |
| Log("HWSTATE: %d", hwstate->fingers[i].tracking_id); |
| if (hwstate->fingers[i].flags & GESTURES_FINGER_NO_TAP) |
| cancel_tapping = true; |
| } |
| for (set<short, kMaxGesturingFingers>::const_iterator it = |
| gs_fingers.begin(), e = gs_fingers.end(); it != e; ++it) { |
| const FingerState* fs = hwstate->GetFingerState(*it); |
| if (!fs) { |
| Err("Missing finger state?!"); |
| continue; |
| } |
| Log("GS: %d", *it); |
| tap_gs_fingers.insert(*it); |
| } |
| } |
| set<short, kMaxTapFingers> added_fingers; |
| |
| // Fingers removed from the pad entirely |
| set<short, kMaxTapFingers> removed_fingers; |
| |
| // Fingers that were gesturing, but now aren't |
| set<short, kMaxFingers> dead_fingers; |
| |
| const bool phys_button_down = hwstate && hwstate->buttons_down != 0; |
| |
| bool is_timeout = (now - tap_to_click_state_entered_ > |
| TimeoutForTtcState(tap_to_click_state_)); |
| |
| if (hwstate && (!same_fingers || prev_tap_gs_fingers_ != tap_gs_fingers)) { |
| // See if fingers were added |
| for (set<short, kMaxGesturingFingers>::const_iterator it = |
| tap_gs_fingers.begin(), e = tap_gs_fingers.end(); it != e; ++it) |
| if (!SetContainsValue(prev_tap_gs_fingers_, *it)) { |
| // Gesturing finger wasn't in prev state. It's new. |
| const FingerState* fs = hwstate->GetFingerState(*it); |
| if (FingerTooCloseToTap(*hwstate, *fs) || |
| FingerTooCloseToTap(*PrevState(0), *fs)) |
| continue; |
| added_fingers.insert(*it); |
| Log("TTC: Added %d", *it); |
| } |
| |
| // See if fingers were removed or are now non-gesturing (dead) |
| for (set<short, kMaxGesturingFingers>::const_iterator it = |
| prev_tap_gs_fingers_.begin(), e = prev_tap_gs_fingers_.end(); |
| it != e; ++it) { |
| if (tap_gs_fingers.find(*it) != tap_gs_fingers.end()) |
| // still gesturing; neither removed nor dead |
| continue; |
| if (!hwstate->GetFingerState(*it)) { |
| // Previously gesturing finger isn't in current state. It's gone. |
| removed_fingers.insert(*it); |
| Log("TTC: Removed %d", *it); |
| } else { |
| // Previously gesturing finger is in current state. It's dead. |
| dead_fingers.insert(*it); |
| Log("TTC: Dead %d", *it); |
| } |
| } |
| } |
| |
| prev_tap_gs_fingers_ = tap_gs_fingers; |
| |
| // The state machine: |
| |
| // If you are updating the code, keep this diagram correct. |
| // We have a TapRecord which stores current tap state. |
| // Also, if the physical button is down or previous gesture type is scroll, |
| // we go to (or stay in) Idle state. |
| |
| // Start |
| // ↓ |
| // [Idle**] <----------------------------------------------------------, |
| // ↓ added finger(s) | |
| // ,>[FirstTapBegan] -<right click: send right click, timeout/movement>->| |
| // | ↓ released all fingers | |
| // ,->[TapComplete*] --<timeout: send click>----------------------------->| |
| // || | | two finger touching: send left click. | |
| // |'----+-' | |
| // | ↓ add finger(s) | |
| // | [SubsequentTapBegan] --<timeout/move w/o delay: send click>-------->| |
| // | | | | release all fingers: send left click | |
| // |<----+-+-' | |
| // | | `-> start non-left click: send left click; goto FirstTapBegan | |
| // | ↓ timeout/movement with delay: send button down | |
| // | ,->[Drag] --<detect 2 finger gesture: send button up>--------------->| |
| // | | ↓ release all fingers | |
| // | | [DragRelease*] --<timeout: send button up>---------------------->| |
| // | | ↓ add finger(s) | |
| // | | [DragRetouch] --<remove fingers (left tap): send button up>----->| |
| // | | | | timeout/movement |
| // | '---+-' |
| // | | remove all fingers (non-left tap): send button up |
| // '-----' |
| // |
| // * When entering TapComplete or DragRelease, we set a timer, since |
| // we will have no fingers on the pad and want to run possibly before |
| // fingers are put on the pad. Note that we use different timeouts |
| // based on which state we're in (tap_timeout_ or tap_drag_timeout_). |
| // ** When entering idle, we reset the TapRecord. |
| |
| Log("TTC State: %s", TapToClickStateName(tap_to_click_state_)); |
| if (!hwstate) |
| Log("This is a timer callback"); |
| if (phys_button_down || KeyboardRecentlyUsed(now) || |
| prev_result_.type == kGestureTypeScroll || |
| cancel_tapping) { |
| Log("Physical button down, keyboard recently used, or drumroll. " |
| "Going to Idle state"); |
| SetTapToClickState(kTtcIdle, now); |
| return; |
| } |
| |
| switch (tap_to_click_state_) { |
| case kTtcIdle: |
| tap_record_.Clear(); |
| if (hwstate && |
| hwstate->timestamp - last_movement_timestamp_ >= |
| motion_tap_prevent_timeout_.val_) { |
| tap_record_.Update( |
| *hwstate, *PrevState(0), added_fingers, removed_fingers, |
| dead_fingers); |
| if (tap_record_.TapBegan()) |
| SetTapToClickState(kTtcFirstTapBegan, now); |
| } |
| break; |
| case kTtcFirstTapBegan: |
| if (is_timeout) { |
| SetTapToClickState(kTtcIdle, now); |
| break; |
| } |
| if (!hwstate) { |
| Log("hwstate NULL but no timeout?!"); |
| break; |
| } |
| tap_record_.Update( |
| *hwstate, *PrevState(0), added_fingers, |
| removed_fingers, dead_fingers); |
| Log("Is tap? %d Is moving? %d", |
| tap_record_.TapComplete(), |
| tap_record_.Moving(*hwstate, tap_move_dist_.val_)); |
| if (tap_record_.TapComplete()) { |
| if (!tap_record_.MinTapPressureMet() || |
| !tap_record_.FingersBelowMaxAge()) { |
| SetTapToClickState(kTtcIdle, now); |
| } else if (tap_record_.TapType() == GESTURES_BUTTON_LEFT && |
| tap_drag_enable_.val_) { |
| SetTapToClickState(kTtcTapComplete, now); |
| } else { |
| *buttons_down = *buttons_up = tap_record_.TapType(); |
| SetTapToClickState(kTtcIdle, now); |
| } |
| } else if (tap_record_.Moving(*hwstate, tap_move_dist_.val_)) { |
| SetTapToClickState(kTtcIdle, now); |
| } |
| break; |
| case kTtcTapComplete: |
| if (!added_fingers.empty()) { |
| |
| tap_record_.Clear(); |
| tap_record_.Update( |
| *hwstate, *PrevState(0), added_fingers, removed_fingers, |
| dead_fingers); |
| |
| // If more than one finger is touching: Send click |
| // and return to FirstTapBegan state. |
| if (tap_record_.TapType() != GESTURES_BUTTON_LEFT) { |
| *buttons_down = *buttons_up = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcFirstTapBegan, now); |
| } else { |
| tap_drag_last_motion_time_ = now; |
| tap_drag_finger_was_stationary_ = false; |
| SetTapToClickState(kTtcSubsequentTapBegan, now); |
| } |
| } else if (is_timeout) { |
| *buttons_down = *buttons_up = |
| tap_record_.MinTapPressureMet() ? tap_record_.TapType() : 0; |
| SetTapToClickState(kTtcIdle, now); |
| } |
| break; |
| case kTtcSubsequentTapBegan: |
| if (!is_timeout && !hwstate) { |
| Log("hwstate NULL but not a timeout?!"); |
| break; |
| } |
| if (hwstate) |
| tap_record_.Update(*hwstate, *PrevState(0), added_fingers, |
| removed_fingers, dead_fingers); |
| |
| if (!tap_record_.Motionless(*hwstate, *PrevState(0), |
| tap_max_movement_.val_)) { |
| tap_drag_last_motion_time_ = now; |
| } |
| if (tap_record_.TapType() == GESTURES_BUTTON_LEFT && |
| now - tap_drag_last_motion_time_ > tap_drag_stationary_time_.val_) { |
| tap_drag_finger_was_stationary_ = true; |
| } |
| |
| if (is_timeout || tap_record_.Moving(*hwstate, tap_move_dist_.val_)) { |
| if (tap_record_.TapType() == GESTURES_BUTTON_LEFT) { |
| if (is_timeout) { |
| // moving with just one finger. Start dragging. |
| *buttons_down = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcDrag, now); |
| } else { |
| bool drag_delay_met = (now - tap_to_click_state_entered_ |
| > tap_drag_delay_.val_); |
| if (drag_delay_met && tap_drag_finger_was_stationary_) { |
| *buttons_down = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcDrag, now); |
| } else { |
| *buttons_down = GESTURES_BUTTON_LEFT; |
| *buttons_up = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcIdle, now); |
| } |
| } |
| } else if (!tap_record_.TapComplete()) { |
| // not just one finger. Send button click and go to idle. |
| *buttons_down = *buttons_up = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcIdle, now); |
| } |
| break; |
| } |
| if (tap_record_.TapType() != GESTURES_BUTTON_LEFT) { |
| // We aren't going to drag, so send left click now and handle current |
| // tap afterwards. |
| *buttons_down = *buttons_up = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcFirstTapBegan, now); |
| } |
| if (tap_record_.TapComplete()) { |
| *buttons_down = *buttons_up = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcTapComplete, now); |
| Log("Subsequent left tap complete"); |
| } |
| break; |
| case kTtcDrag: |
| if (hwstate) |
| tap_record_.Update( |
| *hwstate, *PrevState(0), added_fingers, removed_fingers, |
| dead_fingers); |
| if (tap_record_.TapComplete()) { |
| tap_record_.Clear(); |
| if (drag_lock_enable_.val_) { |
| SetTapToClickState(kTtcDragRelease, now); |
| } else { |
| *buttons_up = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcIdle, now); |
| } |
| } |
| if (tap_record_.TapType() != GESTURES_BUTTON_LEFT && |
| now - tap_to_click_state_entered_ <= evaluation_timeout_.val_) { |
| // We thought we were dragging, but actually we're doing a |
| // non-tap-to-click multitouch gesture. |
| *buttons_up = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcIdle, now); |
| } |
| break; |
| case kTtcDragRelease: |
| if (!added_fingers.empty()) { |
| tap_record_.Update( |
| *hwstate, *PrevState(0), added_fingers, removed_fingers, |
| dead_fingers); |
| SetTapToClickState(kTtcDragRetouch, now); |
| } else if (is_timeout) { |
| *buttons_up = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcIdle, now); |
| } |
| break; |
| case kTtcDragRetouch: |
| if (hwstate) |
| tap_record_.Update( |
| *hwstate, *PrevState(0), added_fingers, removed_fingers, |
| dead_fingers); |
| if (tap_record_.TapComplete()) { |
| *buttons_up = GESTURES_BUTTON_LEFT; |
| if (tap_record_.TapType() == GESTURES_BUTTON_LEFT) |
| SetTapToClickState(kTtcIdle, now); |
| else |
| SetTapToClickState(kTtcTapComplete, now); |
| break; |
| } |
| if (is_timeout) { |
| SetTapToClickState(kTtcDrag, now); |
| break; |
| } |
| if (!hwstate) { |
| Log("not timeout but hwstate is NULL?!"); |
| break; |
| } |
| if (tap_record_.Moving(*hwstate, tap_move_dist_.val_)) |
| SetTapToClickState(kTtcDrag, now); |
| break; |
| } |
| Log("TTC: New state: %s", TapToClickStateName(tap_to_click_state_)); |
| // Take action based on new state: |
| switch (tap_to_click_state_) { |
| case kTtcTapComplete: |
| *timeout = TimeoutForTtcState(tap_to_click_state_); |
| break; |
| case kTtcDragRelease: |
| *timeout = TimeoutForTtcState(tap_to_click_state_); |
| break; |
| default: // so gcc doesn't complain about missing enums |
| break; |
| } |
| } |
| |
| bool ImmediateInterpreter::FingerTooCloseToTap(const HardwareState& hwstate, |
| const FingerState& fs) { |
| const float kMinAllowableSq = |
| tapping_finger_min_separation_.val_ * tapping_finger_min_separation_.val_; |
| for (size_t i = 0; i < hwstate.finger_cnt; i++) { |
| const FingerState* iter_fs = &hwstate.fingers[i]; |
| if (iter_fs->tracking_id == fs.tracking_id) |
| continue; |
| float dist_sq = DistSq(fs, *iter_fs); |
| if (dist_sq < kMinAllowableSq) |
| return true; |
| } |
| return false; |
| } |
| |
| void ImmediateInterpreter::SetPrevState(const HardwareState& hwstate) { |
| newest_prev_state_idx_ = |
| (newest_prev_state_idx_ + arraysize(prev_states_) - 1) % |
| arraysize(prev_states_); |
| PrevState(0)->DeepCopy(hwstate, hw_props_.max_finger_cnt); |
| } |
| |
| bool ImmediateInterpreter::FingerInDampenedZone( |
| const FingerState& finger) const { |
| // TODO(adlr): cache thresh |
| float thresh = hw_props_.bottom - bottom_zone_size_.val_; |
| return finger.position_y > thresh; |
| } |
| |
| void ImmediateInterpreter::FillStartPositions(const HardwareState& hwstate) { |
| for (short i = 0; i < hwstate.finger_cnt; i++) |
| start_positions_[hwstate.fingers[i].tracking_id] = |
| Point(hwstate.fingers[i].position_x, hwstate.fingers[i].position_y); |
| } |
| |
| int ImmediateInterpreter::EvaluateButtonType( |
| const HardwareState& hwstate) { |
| if (hw_props_.supports_t5r2 && hwstate.touch_cnt > 2) { |
| if (hwstate.touch_cnt - thumb_.size() == 3 && |
| three_finger_click_enable_.val_ && t5r2_three_finger_click_enable_.val_) |
| return GESTURES_BUTTON_MIDDLE; |
| return GESTURES_BUTTON_RIGHT; |
| } |
| int num_pointing = pointing_.size(); |
| if (num_pointing <= 1) |
| return hwstate.buttons_down; |
| if (current_gesture_type_ == kGestureTypeScroll) |
| return GESTURES_BUTTON_RIGHT; |
| if (num_pointing == 3 && three_finger_click_enable_.val_) |
| return GESTURES_BUTTON_MIDDLE; |
| if (num_pointing > 2) { |
| Log("TODO: handle more advanced touchpads."); |
| return GESTURES_BUTTON_LEFT; |
| } |
| |
| // If we get to here, then: |
| // pointing_.size() == 2 && current_gesture_type_ != kGestureTypeScroll. |
| // Find which two fingers are performing the gesture. |
| |
| const FingerState* finger1 = hwstate.GetFingerState(*pointing_.begin()); |
| const FingerState* finger2 = hwstate.GetFingerState(*(pointing_.begin() + 1)); |
| |
| if (!TwoFingersGesturing(*finger1, *finger2)) |
| return GESTURES_BUTTON_LEFT; |
| |
| // The way to tell if it is a right click: |
| // 1. two fingers come down and immediately click -> right click |
| // 2. one finger is on the pad for a long time/idle (many seconds), second |
| // finger comes down and immediately clicks -> left click |
| // 3. one finger is on the pad for a long time/idle (many seconds), second |
| // finger comes down, a while passes, button clicks down -> right click |
| |
| stime_t finger1_start_time = finger_origin_timestamp(finger1->tracking_id); |
| stime_t finger2_start_time = finger_origin_timestamp(finger2->tracking_id); |
| stime_t start_time_delta = finger1_start_time - finger2_start_time; |
| if (fabs(start_time_delta) < right_click_start_time_diff_.val_) |
| return GESTURES_BUTTON_RIGHT; |
| |
| stime_t finger_age; |
| if (finger1_start_time > finger2_start_time) |
| finger_age = hwstate.timestamp - finger1_start_time; |
| else |
| finger_age = hwstate.timestamp - finger2_start_time; |
| return (finger_age < right_click_second_finger_age_.val_) ? |
| GESTURES_BUTTON_LEFT : GESTURES_BUTTON_RIGHT; |
| } |
| |
| bool ImmediateInterpreter::PressureChangingSignificantly( |
| stime_t now, const FingerState& current) const { |
| bool pressure_is_increasing = false; |
| bool pressure_direction_established = false; |
| const FingerState* prev = ¤t; |
| stime_t duration = 0.0; |
| |
| if (max_pressure_change_duration_.val_ > 0.0) { |
| for (size_t i = 0; i < arraysize(prev_states_); i++) { |
| stime_t local_duration = now - PrevState(i)->timestamp; |
| if (local_duration > max_pressure_change_duration_.val_) |
| break; |
| |
| duration = local_duration; |
| const FingerState* fs = PrevState(i)->GetFingerState(current.tracking_id); |
| // If the finger just appeared, there's no history to look at. |
| if (!fs) |
| return false; |
| |
| float pressure_difference = prev->pressure - fs->pressure; |
| if (pressure_difference) { |
| bool is_currently_increasing = pressure_difference > 0.0; |
| if (!pressure_direction_established) { |
| pressure_is_increasing = is_currently_increasing; |
| pressure_direction_established = true; |
| } |
| |
| // If pressure changes are unstable, it's likely just noise. |
| if (is_currently_increasing != pressure_is_increasing) |
| return false; |
| } |
| prev = fs; |
| } |
| } else { |
| // To disable this feature, max_pressure_change_duration_ can be set to a |
| // negative number. When this occurs it reverts to just checking the last |
| // event, not looking through the backlog as well. |
| prev = PrevState(0)->GetFingerState(current.tracking_id); |
| duration = now - PrevState(0)->timestamp; |
| } |
| |
| float dp_thresh = duration * |
| (prev_result_high_pressure_change_ ? |
| max_pressure_change_hysteresis_.val_ : |
| max_pressure_change_.val_); |
| float dp = fabsf(current.pressure - prev->pressure); |
| return dp > dp_thresh; |
| } |
| |
| void ImmediateInterpreter::UpdateStartedMovingTime( |
| const HardwareState& hwstate, |
| const set<short, kMaxGesturingFingers>& gs_fingers) { |
| SetRemoveMissing(&moving_, gs_fingers); |
| if (moving_.size() == gs_fingers.size()) |
| return; // All fingers already started moving |
| const float kMinDistSq = |
| change_move_distance_.val_ * change_move_distance_.val_; |
| for (set<short, kMaxGesturingFingers>::const_iterator |
| it = gs_fingers.begin(), e = gs_fingers.end(); it != e; ++it) { |
| const FingerState* fs = hwstate.GetFingerState(*it); |
| if (!fs) { |
| Err("Missing hardware state!"); |
| continue; |
| } |
| if (!MapContainsKey(start_positions_, *it)) { |
| Err("Missing start position!"); |
| continue; |
| } |
| if (SetContainsValue(moving_, fs->tracking_id)) { |
| // This finger already moving |
| continue; |
| } |
| const Point& start_position = start_positions_[*it]; |
| float dist_sq = DistSqXY(*fs, start_position.x_, start_position.y_); |
| if (dist_sq > kMinDistSq) { |
| started_moving_time_ = hwstate.timestamp; |
| moving_.insert(fs->tracking_id); |
| } |
| } |
| } |
| |
| void ImmediateInterpreter::UpdateButtons(const HardwareState& hwstate, |
| stime_t* timeout) { |
| // TODO(miletus): To distinguish between left/right buttons down |
| bool prev_button_down = PrevState(0)->buttons_down; |
| bool button_down = hwstate.buttons_down; |
| if (!prev_button_down && !button_down) |
| return; |
| bool phys_down_edge = button_down && !prev_button_down; |
| bool phys_up_edge = !button_down && prev_button_down; |
| |
| if (phys_down_edge) { |
| finger_seen_since_button_down_ = false; |
| sent_button_down_ = false; |
| button_down_timeout_ = hwstate.timestamp + button_evaluation_timeout_.val_; |
| } |
| |
| // If we haven't seen a finger on the pad yet we shouldn't do anything |
| finger_seen_since_button_down_ = |
| finger_seen_since_button_down_ || (hwstate.finger_cnt > 0); |
| if (!finger_seen_since_button_down_ && !zero_finger_click_enable_.val_) |
| return; |
| |
| if (!sent_button_down_) { |
| button_type_ = EvaluateButtonType(hwstate); |
| // button_up before button_evaluation_timeout_ expired. |
| // Send up & down for button that was previously down, but not yet sent. |
| if (button_type_ == GESTURES_BUTTON_NONE) |
| button_type_ = prev_button_down; |
| // We send non-left buttons immediately, but delay left in case future |
| // packets indicate non-left button. |
| if (button_type_ != GESTURES_BUTTON_LEFT || |
| button_down_timeout_ <= hwstate.timestamp || |
| phys_up_edge) { |
| // Send button down |
| if (result_.type == kGestureTypeButtonsChange) |
| Err("Gesture type already button?!"); |
| result_ = Gesture(kGestureButtonsChange, |
| PrevState(0)->timestamp, |
| hwstate.timestamp, |
| button_type_, |
| 0); |
| sent_button_down_ = true; |
| } else if (button_type_ == GESTURES_BUTTON_LEFT && |
| hwstate.timestamp < button_down_timeout_ && timeout) { |
| *timeout = button_down_timeout_ - hwstate.timestamp; |
| } |
| } |
| if (phys_up_edge) { |
| // Send button up |
| if (result_.type != kGestureTypeButtonsChange) |
| result_ = Gesture(kGestureButtonsChange, |
| PrevState(0)->timestamp, |
| hwstate.timestamp, |
| 0, |
| button_type_); |
| else |
| result_.details.buttons.up = button_type_; |
| // Reset button state |
| button_type_ = GESTURES_BUTTON_NONE; |
| button_down_timeout_ = 0; |
| sent_button_down_ = false; |
| } |
| } |
| |
| void ImmediateInterpreter::UpdateButtonsTimeout(stime_t now) { |
| if (sent_button_down_) { |
| Err("How is sent_button_down_ set?"); |
| return; |
| } |
| if (button_type_ != GESTURES_BUTTON_LEFT) { |
| Err("How is button_type_ not GESTURES_BUTTON_LEFT?"); |
| return; |
| } |
| sent_button_down_ = true; |
| result_ = Gesture(kGestureButtonsChange, |
| PrevState(0)->timestamp, |
| now, |
| GESTURES_BUTTON_LEFT, |
| 0); |
| } |
| |
| namespace { |
| float IncreasingSpeed(float dist, float dt, |
| float prev_dist, float prev_dt) { |
| return fabsf(dist) * prev_dt > fabsf(prev_dist) * dt; |
| } |
| float DecreasingSpeed(float dist, float dt, |
| float prev_dist, float prev_dt) { |
| return fabsf(dist) * prev_dt < fabsf(prev_dist) * dt; |
| } |
| } // namespace {} |
| |
| size_t ImmediateInterpreter::ScrollEventsForFlingCount() const { |
| if (scroll_buffer_.Size() <= 1) |
| return scroll_buffer_.Size(); |
| enum Direction { kNone, kUp, kDown, kLeft, kRight }; |
| size_t i = 0; |
| Direction prev_direction = kNone; |
| size_t fling_buffer_depth = static_cast<size_t>(fling_buffer_depth_.val_); |
| for (; i < scroll_buffer_.Size() && i < fling_buffer_depth; i++) { |
| const ScrollEvent& event = scroll_buffer_.Get(i); |
| if (FloatEq(event.dx, 0.0) && FloatEq(event.dy, 0.0)) |
| break; |
| Direction direction; |
| if (fabsf(event.dx) > fabsf(event.dy)) |
| direction = event.dx > 0 ? kRight : kLeft; |
| else |
| direction = event.dy > 0 ? kDown : kUp; |
| if (i > 0 && direction != prev_direction) |
| break; |
| prev_direction = direction; |
| } |
| return i; |
| } |
| |
| void ImmediateInterpreter::RegressScrollVelocity(int count, ScrollEvent* out) |
| const { |
| struct RegressionSums { |
| float tt_; // Cumulative sum of t^2. |
| float t_; // Cumulative sum of t. |
| float tx_; // Cumulative sum of t * x. |
| float ty_; // Cumulative sum of t * y. |
| float x_; // Cumulative sum of x. |
| float y_; // Cumulative sum of y. |
| }; |
| |
| out->dt = 1; |
| if (count <= 1) { |
| out->dx = 0; |
| out->dy = 0; |
| return; |
| } |
| |
| RegressionSums sums = {0, 0, 0, 0, 0, 0}; |
| |
| float time = 0; |
| float x_coord = 0; |
| float y_coord = 0; |
| |
| for (int i = count - 1; i >= 0; --i) { |
| const ScrollEvent& event = scroll_buffer_.Get(i); |
| |
| time += event.dt; |
| x_coord += event.dx; |
| y_coord += event.dy; |
| |
| sums.tt_ += time * time; |
| sums.t_ += time; |
| sums.tx_ += time * x_coord; |
| sums.ty_ += time * y_coord; |
| sums.x_ += x_coord; |
| sums.y_ += y_coord; |
| } |
| |
| // Note the regression determinant only depends on the values of t, and should |
| // never be zero so long as (1) count > 1, and (2) dt values are all non-zero. |
| float det = count * sums.tt_ - sums.t_ * sums.t_; |
| |
| if (det) { |
| float det_inv = 1.0 / det; |
| |
| out->dx = (count * sums.tx_ - sums.t_ * sums.x_) * det_inv; |
| out->dy = (count * sums.ty_ - sums.t_ * sums.y_) * det_inv; |
| } else { |
| out->dx = 0; |
| out->dy = 0; |
| } |
| } |
| |
| void ImmediateInterpreter::ComputeFling(ScrollEvent* out) const { |
| ScrollEvent zero = { 0.0, 0.0, 0.0 }; |
| |
| // Make sure fling buffer met the minimum average speed for a fling. |
| float buf_dist_sq = 0.0; |
| float buf_dt = 0.0; |
| scroll_buffer_.GetSpeedSq(&buf_dist_sq, &buf_dt); |
| if (fling_buffer_min_avg_speed_.val_ * fling_buffer_min_avg_speed_.val_ * |
| buf_dt * buf_dt > buf_dist_sq) { |
| *out = zero; |
| return; |
| } |
| |
| const size_t count = ScrollEventsForFlingCount(); |
| if (count > scroll_buffer_.Size()) { |
| Err("Too few events in scroll buffer"); |
| *out = zero; |
| return; |
| } |
| |
| if (count < 2) { |
| if (count == 0) |
| *out = zero; |
| else if (count == 1) |
| *out = scroll_buffer_.Get(0); |
| return; |
| } |
| |
| // If we get here, count == 3 && scroll_buffer_.Size() >= 3 |
| RegressScrollVelocity(count, out); |
| } |
| |
| void ImmediateInterpreter::FillResultGesture( |
| const HardwareState& hwstate, |
| const set<short, kMaxGesturingFingers>& fingers) { |
| if (current_gesture_type_ == kGestureTypeMove || |
| current_gesture_type_ == kGestureTypeScroll) |
| last_movement_timestamp_ = hwstate.timestamp; |
| switch (current_gesture_type_) { |
| case kGestureTypeMove: { |
| if (fingers.empty()) |
| return; |
| // Use highest finger (the one closes to the keyboard), excluding |
| // palms, to compute motion. First, need to find out which finger that is. |
| const FingerState* current = NULL; |
| for (set<short, kMaxGesturingFingers>::const_iterator it = |
| fingers.begin(), e = fingers.end(); it != e; ++it) { |
| const FingerState* fs = hwstate.GetFingerState(*it); |
| if (!current || fs->position_y < current->position_y) |
| current = fs; |
| } |
| // Find corresponding finger id in previous state |
| const FingerState* prev = |
| PrevState(0)->GetFingerState(current->tracking_id); |
| if (!prev || !current) |
| return; |
| if (current->flags & GESTURES_FINGER_MERGE) |
| return; |
| if (PressureChangingSignificantly(hwstate.timestamp, *current)) { |
| prev_result_high_pressure_change_ = true; |
| return; |
| } |
| prev_result_high_pressure_change_ = false; |
| float dx = current->position_x - prev->position_x; |
| if (current->flags & GESTURES_FINGER_WARP_X_MOVE) |
| dx = 0.0; |
| float dy = current->position_y - prev->position_y; |
| if (current->flags & GESTURES_FINGER_WARP_Y_MOVE) |
| dy = 0.0; |
| result_ = Gesture(kGestureMove, |
| PrevState(0)->timestamp, |
| hwstate.timestamp, |
| dx, |
| dy); |
| break; |
| } |
| case kGestureTypeScroll: { |
| // For now, we take the movement of the biggest moving finger. |
| float max_mag_sq = 0.0; // square of max mag |
| float dx = 0.0; |
| float dy = 0.0; |
| bool high_pressure_change = false; |
| for (set<short, kMaxGesturingFingers>::const_iterator it = |
| fingers.begin(), e = fingers.end(); it != e; ++it) { |
| const FingerState* fs = hwstate.GetFingerState(*it); |
| const FingerState* prev = PrevState(0)->GetFingerState(*it); |
| if (!prev) |
| return; |
| high_pressure_change = high_pressure_change || |
| (PressureChangingSignificantly(hwstate.timestamp, *fs)); |
| float local_dx = fs->position_x - prev->position_x; |
| if (fs->flags & GESTURES_FINGER_WARP_X_NON_MOVE) |
| local_dx = 0.0; |
| float local_dy = fs->position_y - prev->position_y; |
| if (fs->flags & GESTURES_FINGER_WARP_Y_NON_MOVE) |
| local_dy = 0.0; |
| float local_max_mag_sq = local_dx * local_dx + local_dy * local_dy; |
| if (local_max_mag_sq > max_mag_sq) { |
| max_mag_sq = local_max_mag_sq; |
| dx = local_dx; |
| dy = local_dy; |
| } |
| } |
| |
| // See if we should snap to vertical/horizontal |
| if (fabsf(dy) < horizontal_scroll_snap_slope_.val_ * fabsf(dx)) |
| dy = 0.0; // snap to horizontal |
| else if (fabsf(dy) > vertical_scroll_snap_slope_.val_ * fabsf(dx)) |
| dx = 0.0; // snap to vertical |
| |
| prev_result_high_pressure_change_ = high_pressure_change; |
| if (high_pressure_change) { |
| // If we get here, it means that the pressure of the finger causing |
| // the scroll is changing a lot, so we don't trust it. It's likely |
| // leaving the touchpad. Normally we might just do nothing, but having |
| // a frame or two of 0 length scroll before a fling looks janky. We |
| // could also just start the fling now, but we don't want to do that |
| // because the fingers may not actually be leaving. What seems to work |
| // well is sort of dead-reckoning approach where we just repeat the |
| // scroll event from the previous input frame. |
| // Since this isn't a "real" scroll event, we don't put it into |
| // scroll_buffer_. |
| // Also, only use previous gesture if it's in the same direction. |
| if (prev_result_.type == kGestureTypeScroll && |
| prev_result_.details.scroll.dy * dy >= 0 && |
| prev_result_.details.scroll.dx * dx >= 0) |
| result_ = prev_result_; |
| return; |
| } |
| |
| if (prev_gesture_type_ != kGestureTypeScroll || |
| prev_gs_fingers_ != fingers) |
| scroll_buffer_.Clear(); |
| if (!fling_buffer_suppress_zero_length_scrolls_.val_ || |
| !FloatEq(dx, 0.0) || !FloatEq(dy, 0.0)) |
| scroll_buffer_.Insert(dx, dy, |
| hwstate.timestamp - PrevState(0)->timestamp); |
| if (max_mag_sq > 0) { |
| result_ = Gesture(kGestureScroll, |
| PrevState(0)->timestamp, |
| hwstate.timestamp, |
| dx, |
| dy); |
| } |
| |
| break; |
| } |
| case kGestureTypeFling: { |
| ScrollEvent out; |
| ComputeFling(&out); |
| |
| float vx = out.dt ? (out.dx / out.dt) : 0.0; |
| float vy = out.dt ? (out.dy / out.dt) : 0.0; |
| |
| result_ = Gesture(kGestureFling, |
| PrevState(0)->timestamp, |
| hwstate.timestamp, |
| vx, |
| vy, |
| GESTURES_FLING_START); |
| break; |
| } |
| case kGestureTypeSwipe: { |
| if (!three_finger_swipe_enable_.val_) |
| break; |
| float sum_delta[] = { 0.0, 0.0 }; |
| bool valid[] = { true, true }; |
| float finger_cnt[] = { 0.0, 0.0 }; |
| float FingerState::*fields[] = { &FingerState::position_x, |
| &FingerState::position_y }; |
| for (set<short, kMaxGesturingFingers>::const_iterator it = |
| fingers.begin(), e = fingers.end(); it != e; ++it) { |
| if (!PrevState(0)->GetFingerState(*it)) { |
| Err("missing prev state?"); |
| continue; |
| } |
| // We have this loop in case we want to compute diagonal swipes at |
| // some point, even if currently we go with just one axis. |
| for (size_t i = 0; i < arraysize(fields); i++) { |
| bool correct_axis = (i == 1) == swipe_is_vertical_; |
| if (!valid[i] || !correct_axis) |
| continue; |
| float FingerState::*field = fields[i]; |
| float delta = hwstate.GetFingerState(*it)->*field - |
| PrevState(0)->GetFingerState(*it)->*field; |
| // The multiply is to see if they have the same sign: |
| if (sum_delta[i] == 0.0 || sum_delta[i] * delta > 0) { |
| sum_delta[i] += delta; |
| finger_cnt[i] += 1.0; |
| } else { |
| sum_delta[i] = 0.0; |
| valid[i] = false; |
| } |
| } |
| } |
| result_ = Gesture( |
| kGestureSwipe, PrevState(0)->timestamp, |
| hwstate.timestamp, |
| (!swipe_is_vertical_ && finger_cnt[0]) ? |
| sum_delta[0] / finger_cnt[0] : 0.0, |
| (swipe_is_vertical_ && finger_cnt[1]) ? |
| sum_delta[1] / finger_cnt[1] : 0.0); |
| break; |
| } |
| case kGestureTypeSwipeLift: { |
| result_ = Gesture(kGestureSwipeLift, |
| PrevState(0)->timestamp, |
| hwstate.timestamp); |
| break; |
| } |
| |
| case kGestureTypePinch: { |
| float current_dist = sqrtf(TwoFingerDistanceSq(hwstate)); |
| result_ = Gesture(kGesturePinch, changed_time_, hwstate.timestamp, |
| current_dist / two_finger_start_distance_); |
| break; |
| } |
| default: |
| result_.type = kGestureTypeNull; |
| } |
| if (current_gesture_type_ != kGestureTypeScroll) { |
| scroll_buffer_.Clear(); |
| } |
| } |
| |
| void ImmediateInterpreter::IntWasWritten(IntProperty* prop) { |
| if (prop == &keyboard_touched_timeval_low_) { |
| struct timeval tv = { |
| keyboard_touched_timeval_high_.val_, |
| keyboard_touched_timeval_low_.val_ |
| }; |
| keyboard_touched_ = StimeFromTimeval(&tv); |
| } |
| } |
| |
| void ImmediateInterpreter::SetHardwarePropertiesImpl( |
| const HardwareProperties& hw_props) { |
| hw_props_ = hw_props; |
| for (size_t i = 0; i < arraysize(prev_states_); i++) { |
| if (prev_states_[i].fingers) { |
| free(prev_states_[i].fingers); |
| prev_states_[i].fingers = NULL; |
| } |
| prev_states_[i].fingers = |
| reinterpret_cast<FingerState*>(calloc(hw_props_.max_finger_cnt, |
| sizeof(FingerState))); |
| } |
| } |
| |
| } // namespace gestures |
