| // Copyright (c) 2011 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 <functional> |
| #include <math.h> |
| |
| #include "gestures/include/gestures.h" |
| #include "gestures/include/logging.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; |
| } |
| touched_[the_id] = fs; |
| } |
| |
| void TapRecord::NoteRelease(short the_id) { |
| if (touched_.find(the_id) == touched_.end()) |
| Err("Release of non-touched finger!"); |
| else |
| released_.insert(the_id); |
| } |
| |
| void TapRecord::Remove(short the_id) { |
| touched_.erase(the_id); |
| released_.erase(the_id); |
| } |
| |
| void TapRecord::Update(const HardwareState& hwstate, |
| const set<short, kMaxTapFingers>& added, |
| const set<short, kMaxTapFingers>& removed, |
| const set<short, kMaxFingers>& dead) { |
| Log("Updating TapRecord."); |
| 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)); |
| Log("Done Updating TapRecord."); |
| } |
| |
| void TapRecord::Clear() { |
| touched_.clear(); |
| released_.clear(); |
| } |
| |
| bool TapRecord::Moving(const HardwareState& hwstate, |
| const float dist_max) const { |
| 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; |
| // Compute distance moved |
| float dist_x = fs->position_x - (*it).second.position_x; |
| float dist_y = fs->position_y - (*it).second.position_y; |
| 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::TapComplete() const { |
| Log("called TapComplete()"); |
| 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); |
| bool ret = !touched_.empty() && (touched_.size() == released_.size()); |
| Log("TapComplete() returning %d", ret); |
| return ret; |
| } |
| |
| int TapRecord::TapType() const { |
| // TODO(adlr): use better logic here |
| return touched_.size() > 1 ? GESTURES_BUTTON_RIGHT : GESTURES_BUTTON_LEFT; |
| } |
| |
| ImmediateInterpreter::ImmediateInterpreter(PropRegistry* prop_reg) |
| : button_type_(0), |
| sent_button_down_(false), |
| button_down_timeout_(0.0), |
| tap_to_click_state_(kTtcIdle), |
| tap_enable_(prop_reg, "Tap Enable", true), |
| tap_timeout_(prop_reg, "Tap Timeout", 0.2), |
| tap_drag_timeout_(prop_reg, "Tap Drag Timeout", 0.7), |
| tap_move_dist_(prop_reg, "Tap Move Distance", 2.0), |
| palm_pressure_(prop_reg, "Palm Pressure", 200.0), |
| palm_edge_width_(prop_reg, "Palm Edge Zone Width", 7.0), |
| palm_edge_point_speed_(prop_reg, "Palm Edge Zone Min Point Speed", 100.0), |
| palm_min_distance_(prop_reg, "Palm Min Distance", 50.0), |
| change_timeout_(prop_reg, "Change Timeout", 0.04), |
| evaluation_timeout_(prop_reg, "Evaluation Timeout", 0.2), |
| two_finger_pressure_diff_thresh_(prop_reg, |
| "Two Finger Pressure Diff Thresh", |
| 32.0), |
| two_finger_close_distance_thresh_(prop_reg, |
| "Two Finger Close Distance Thresh", |
| 40.0), |
| two_finger_scroll_distance_thresh_(prop_reg, |
| "Two Finger Scroll Distance Thresh", |
| 2.0), |
| max_pressure_change_(prop_reg, "Max Allowed Pressure Change", 8.0), |
| 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) { |
| memset(&prev_state_, 0, sizeof(prev_state_)); |
| } |
| |
| ImmediateInterpreter::~ImmediateInterpreter() { |
| if (prev_state_.fingers) { |
| free(prev_state_.fingers); |
| prev_state_.fingers = NULL; |
| } |
| } |
| |
| Gesture* ImmediateInterpreter::SyncInterpret(HardwareState* hwstate, |
| stime_t* timeout) { |
| if (!prev_state_.fingers) { |
| Err("Must call SetHardwareProperties() before Push()."); |
| return 0; |
| } |
| |
| result_.type = kGestureTypeNull; |
| const bool same_fingers = prev_state_.SameFingersAs(*hwstate); |
| if (!same_fingers) { |
| // Fingers changed, do nothing this time |
| ResetSameFingersState(hwstate->timestamp); |
| FillStartPositions(*hwstate); |
| } |
| UpdatePalmState(*hwstate); |
| set<short, kMaxGesturingFingers> gs_fingers = GetGesturingFingers(*hwstate); |
| |
| UpdateButtons(*hwstate); |
| UpdateTapGesture(hwstate, |
| gs_fingers, |
| same_fingers, |
| hwstate->timestamp, |
| timeout); |
| |
| UpdateCurrentGestureType(*hwstate, gs_fingers); |
| if (result_.type == kGestureTypeNull) |
| FillResultGesture(*hwstate, gs_fingers); |
| |
| SetPrevState(*hwstate); |
| prev_gs_fingers_ = gs_fingers; |
| return result_.type != kGestureTypeNull ? &result_ : NULL; |
| } |
| |
| Gesture* ImmediateInterpreter::HandleTimer(stime_t now, stime_t* timeout) { |
| result_.type = kGestureTypeNull; |
| UpdateTapGesture(NULL, |
| set<short, kMaxGesturingFingers>(), |
| false, |
| now, |
| timeout); |
| return result_.type != kGestureTypeNull ? &result_ : NULL; |
| } |
| |
| void ImmediateInterpreter::ResetSameFingersState(stime_t now) { |
| palm_.clear(); |
| pointing_.clear(); |
| start_positions_.clear(); |
| changed_time_ = now; |
| } |
| |
| bool ImmediateInterpreter::FingerNearOtherFinger(const HardwareState& hwstate, |
| size_t finger_idx) { |
| const FingerState& fs = hwstate.fingers[finger_idx]; |
| for (int i = 0; i < hwstate.finger_cnt; ++i) { |
| const FingerState& other_fs = hwstate.fingers[i]; |
| if (other_fs.tracking_id == fs.tracking_id) |
| continue; |
| float dx = fs.position_x - other_fs.position_x; |
| float dy = fs.position_y - other_fs.position_y; |
| bool too_close_to_other_finger = |
| (dx * dx + dy * dy) < (palm_min_distance_.val_ * |
| palm_min_distance_.val_) && |
| !SetContainsValue(palm_, other_fs.tracking_id); |
| if (too_close_to_other_finger) |
| return true; |
| } |
| return false; |
| } |
| |
| bool ImmediateInterpreter::FingerInPalmEdgeZone(const FingerState& fs) { |
| return fs.position_x < palm_edge_width_.val_ || |
| fs.position_x > (hw_props_.right - palm_edge_width_.val_) || |
| fs.position_y < palm_edge_width_.val_ || |
| fs.position_y > (hw_props_.bottom - palm_edge_width_.val_); |
| } |
| |
| bool ImmediateInterpreter::PossiblePalmMovingQuickly(const FingerState& fs, |
| stime_t now) { |
| const FingerState* prev_fs = prev_state_.GetFingerState(fs.tracking_id); |
| if (!prev_fs) |
| return false; |
| float dx = fs.position_x - prev_fs->position_x; |
| float dy = fs.position_y - prev_fs->position_y; |
| float dt = now - prev_state_.timestamp; |
| float dist_sq = dx * dx + dy * dy; |
| float limit_dist_sq = palm_edge_point_speed_.val_ * |
| palm_edge_point_speed_.val_ * |
| dt * dt; |
| return dist_sq > limit_dist_sq; |
| } |
| |
| void ImmediateInterpreter::UpdatePalmState(const HardwareState& hwstate) { |
| for (short i = 0; i < hwstate.finger_cnt; i++) { |
| const FingerState& fs = hwstate.fingers[i]; |
| // Mark anything over the palm thresh as a palm |
| if (fs.pressure >= palm_pressure_.val_) { |
| palm_.insert(fs.tracking_id); |
| pointing_.erase(fs.tracking_id); |
| continue; |
| } |
| } |
| |
| for (short i = 0; i < hwstate.finger_cnt; i++) { |
| const FingerState& fs = hwstate.fingers[i]; |
| bool prev_palm = SetContainsValue(palm_, fs.tracking_id); |
| bool prev_pointing = SetContainsValue(pointing_, fs.tracking_id); |
| |
| // Lock onto palm/pointing |
| if (prev_palm || prev_pointing) |
| continue; |
| // If another finger is close by, let this be pointing |
| if (FingerNearOtherFinger(hwstate, i) || !FingerInPalmEdgeZone(fs) || |
| PossiblePalmMovingQuickly(fs, hwstate.timestamp)) |
| pointing_.insert(fs.tracking_id); |
| } |
| } |
| |
| 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 { |
| const size_t kMaxSize = 2; // We support up to 2 finger gestures |
| if (pointing_.size() <= kMaxSize) |
| return pointing_; |
| |
| const FingerState* fs[hwstate.finger_cnt]; |
| for (size_t i = 0; i < hwstate.finger_cnt; ++i) |
| fs[i] = &hwstate.fingers[i]; |
| |
| GetGesturingFingersCompare compare; |
| // Pull the kMaxSize FingerStates w/ the lowest position_y to the |
| // front of fs[]. |
| std::partial_sort(fs, fs + kMaxSize, fs + hwstate.finger_cnt, compare); |
| set<short, kMaxGesturingFingers> ret; |
| ret.insert(fs[0]->tracking_id); |
| ret.insert(fs[1]->tracking_id); |
| return ret; |
| } |
| |
| void ImmediateInterpreter::UpdateCurrentGestureType( |
| const HardwareState& hwstate, |
| const set<short, kMaxGesturingFingers>& gs_fingers) { |
| |
| if (hwstate.timestamp < changed_time_ + change_timeout_.val_) { |
| current_gesture_type_ = kGestureTypeNull; |
| return; |
| } |
| if (sent_button_down_ || tap_to_click_state_ == kTtcDrag) { |
| current_gesture_type_ = kGestureTypeMove; |
| return; |
| } |
| if (hw_props_.supports_t5r2 && hwstate.touch_cnt > 2) { |
| current_gesture_type_ = kGestureTypeScroll; |
| return; |
| } |
| int num_gesturing = gs_fingers.size(); |
| if (num_gesturing == 0) { |
| current_gesture_type_ = kGestureTypeNull; |
| } else if (num_gesturing == 1) { |
| current_gesture_type_ = kGestureTypeMove; |
| } else if (num_gesturing == 2) { |
| if (hwstate.timestamp - changed_time_ < evaluation_timeout_.val_ || |
| current_gesture_type_ == kGestureTypeNull) { |
| 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 { |
| Log("TODO(adlr): support > 2 finger gestures."); |
| } |
| } |
| |
| bool ImmediateInterpreter::TwoFingersGesturing( |
| const FingerState& finger1, |
| const FingerState& finger2) const { |
| // First, make sure the pressure difference isn't too great |
| float pdiff = fabsf(finger1.pressure - finger2.pressure); |
| if (pdiff > two_finger_pressure_diff_thresh_.val_) |
| return false; |
| float xdist = fabsf(finger1.position_x - finger2.position_x); |
| float ydist = fabsf(finger1.position_y - finger2.position_y); |
| |
| // Next, make sure distance between fingers isn't too great |
| if ((xdist * xdist + ydist * ydist) > |
| (two_finger_close_distance_thresh_.val_ * |
| two_finger_close_distance_thresh_.val_)) |
| 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) { |
| // Compute distance traveled since fingers changed for each finger |
| float dx1 = finger1.position_x - |
| start_positions_[finger1.tracking_id].first; |
| float dy1 = finger1.position_y - |
| start_positions_[finger1.tracking_id].second; |
| float dx2 = finger2.position_x - |
| start_positions_[finger2.tracking_id].first; |
| float dy2 = finger2.position_y - |
| start_positions_[finger2.tracking_id].second; |
| |
| float large_dx = MaxMag(dx1, dx2); |
| float large_dy = MaxMag(dy1, dy2); |
| float small_dx = MinMag(dx1, dx2); |
| float small_dy = MinMag(dy1, dy2); |
| |
| 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; |
| return ((large_dx * small_dx) >= 0.0) ? // same direction |
| kGestureTypeScroll : kGestureTypeNull; |
| } 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; |
| return ((large_dy * small_dy) >= 0.0) ? // same direction |
| kGestureTypeScroll : kGestureTypeNull; |
| } |
| } |
| |
| 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 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, |
| prev_state_.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_) |
| return; |
| Log("Entering UpdateTapState"); |
| if (hwstate) |
| for (int i = 0; i < hwstate->finger_cnt; ++i) |
| Log("HWSTATE: %d", hwstate->fingers[i].tracking_id); |
| for (set<short, kMaxGesturingFingers>::const_iterator it = |
| gs_fingers.begin(), e = gs_fingers.end(); it != e; ++it) |
| Log("GS: %d", *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_gs_fingers_ != gs_fingers)) { |
| // See if fingers were added |
| for (set<short, kMaxGesturingFingers>::const_iterator it = |
| gs_fingers.begin(), e = gs_fingers.end(); it != e; ++it) |
| if (!prev_state_.GetFingerState(*it)) { |
| // Gesturing finger wasn't in prev state. It's new. |
| 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_gs_fingers_.begin(), e = prev_gs_fingers_.end(); |
| it != e; ++it) { |
| if (gs_fingers.find(*it) != 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); |
| } |
| } |
| } |
| |
| // 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, 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>----------------------------->| |
| // | ↓ add finger(s): send button down | |
| // | [SubsequentTapBegan] --<timeout/move(non-drag): send btn up>------->| |
| // | | | released all fingers: send button up | |
| // |<----+-' | |
| // | ↓ timeout/movement (that looks like drag) | |
| // | ,->[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) { |
| Log("Physical button down. Going to Idle state"); |
| SetTapToClickState(kTtcIdle, now); |
| return; |
| } |
| |
| switch (tap_to_click_state_) { |
| case kTtcIdle: |
| if (!added_fingers.empty()) { |
| tap_record_.Update( |
| *hwstate, added_fingers, removed_fingers, dead_fingers); |
| 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, 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_.TapType() == GESTURES_BUTTON_LEFT) { |
| 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()) { |
| // Generate a button event for the tap type that got us into |
| // kTtcTapComplete state, after which we'll repurpose |
| // tap_record_ to record the next tap. |
| *buttons_down = tap_record_.TapType(); |
| tap_record_.Clear(); |
| tap_record_.Update( |
| *hwstate, added_fingers, removed_fingers, dead_fingers); |
| SetTapToClickState(kTtcSubsequentTapBegan, now); |
| } else if (is_timeout) { |
| *buttons_down = *buttons_up = tap_record_.TapType(); |
| SetTapToClickState(kTtcIdle, now); |
| } |
| break; |
| case kTtcSubsequentTapBegan: |
| if (!is_timeout && !hwstate) { |
| Log("hwstate NULL but not a timeout?!"); |
| break; |
| } |
| if (hwstate) |
| tap_record_.Update( |
| *hwstate, added_fingers, removed_fingers, dead_fingers); |
| if (is_timeout || tap_record_.Moving(*hwstate, tap_move_dist_.val_)) { |
| if (tap_record_.TapType() == GESTURES_BUTTON_LEFT) { |
| SetTapToClickState(kTtcDrag, now); |
| } else { |
| *buttons_up = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcIdle, now); |
| } |
| break; |
| } |
| if (tap_record_.TapComplete()) { |
| *buttons_up = GESTURES_BUTTON_LEFT; |
| SetTapToClickState(kTtcTapComplete, now); |
| Log("Subsequent left tap complete"); |
| } |
| break; |
| case kTtcDrag: |
| if (hwstate) |
| tap_record_.Update( |
| *hwstate, added_fingers, removed_fingers, dead_fingers); |
| if (tap_record_.TapComplete()) { |
| tap_record_.Clear(); |
| SetTapToClickState(kTtcDragRelease, 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, 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, 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 kTtcIdle: |
| tap_record_.Clear(); |
| break; |
| 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; |
| } |
| } |
| |
| void ImmediateInterpreter::SetPrevState(const HardwareState& hwstate) { |
| prev_state_.timestamp = hwstate.timestamp; |
| prev_state_.buttons_down = hwstate.buttons_down; |
| prev_state_.touch_cnt = hwstate.touch_cnt; |
| prev_state_.finger_cnt = min(hwstate.finger_cnt, hw_props_.max_finger_cnt); |
| memcpy(prev_state_.fingers, |
| hwstate.fingers, |
| prev_state_.finger_cnt * sizeof(FingerState)); |
| } |
| |
| 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] = |
| make_pair(hwstate.fingers[i].position_x, hwstate.fingers[i].position_y); |
| } |
| |
| int ImmediateInterpreter::EvaluateButtonType( |
| const HardwareState& hwstate) { |
| if (hw_props_.supports_t5r2 && hwstate.finger_cnt > 2) |
| return GESTURES_BUTTON_RIGHT; |
| int num_pointing = pointing_.size(); |
| if (num_pointing <= 1) |
| return GESTURES_BUTTON_LEFT; |
| if (current_gesture_type_ == kGestureTypeScroll) |
| return GESTURES_BUTTON_RIGHT; |
| 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)); |
| |
| return TwoFingersGesturing(*finger1, *finger2) ? |
| GESTURES_BUTTON_RIGHT : GESTURES_BUTTON_LEFT; |
| } |
| |
| void ImmediateInterpreter::UpdateButtons(const HardwareState& hwstate) { |
| // Current hardware will only ever send a physical left-button down. |
| bool prev_button_down = prev_state_.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) { |
| button_type_ = GESTURES_BUTTON_LEFT; |
| sent_button_down_ = false; |
| button_down_timeout_ = hwstate.timestamp + button_evaluation_timeout_.val_; |
| } |
| if (!sent_button_down_) { |
| button_type_ = EvaluateButtonType(hwstate); |
| // 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, |
| prev_state_.timestamp, |
| hwstate.timestamp, |
| button_type_, |
| 0); |
| sent_button_down_ = true; |
| } |
| } |
| if (phys_up_edge) { |
| // Send button up |
| if (result_.type != kGestureTypeButtonsChange) |
| result_ = Gesture(kGestureButtonsChange, |
| prev_state_.timestamp, |
| hwstate.timestamp, |
| 0, |
| button_type_); |
| else |
| result_.details.buttons.up = button_type_; |
| // Reset button state |
| button_type_ = 0; |
| button_down_timeout_ = 0; |
| sent_button_down_ = false; |
| } |
| } |
| |
| void ImmediateInterpreter::FillResultGesture( |
| const HardwareState& hwstate, |
| const set<short, kMaxGesturingFingers>& fingers) { |
| 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 = |
| prev_state_.GetFingerState(current->tracking_id); |
| if (!prev) { |
| Err("No previous state!"); |
| return; |
| } |
| if (fabsf(current->pressure - prev->pressure) > |
| max_pressure_change_.val_) |
| break; |
| result_ = Gesture(kGestureMove, |
| prev_state_.timestamp, |
| hwstate.timestamp, |
| current->position_x - |
| prev->position_x, |
| current->position_y - |
| prev->position_y); |
| 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; |
| for (set<short, kMaxGesturingFingers>::const_iterator it = |
| fingers.begin(), e = fingers.end(); it != e; ++it) { |
| const FingerState* fs = hwstate.GetFingerState(*it); |
| const FingerState* prev = prev_state_.GetFingerState(*it); |
| if (fabsf(fs->pressure - prev->pressure) > max_pressure_change_.val_) |
| return; |
| float local_dx = fs->position_x - prev->position_x; |
| float local_dy = fs->position_y - prev->position_y; |
| 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; |
| } |
| } |
| |
| // For now, only do horizontal or vertical scroll |
| if (fabsf(dx) > fabsf(dy)) |
| dy = 0.0; |
| else |
| dx = 0.0; |
| |
| if (max_mag_sq > 0) { |
| result_ = Gesture(kGestureScroll, |
| prev_state_.timestamp, |
| hwstate.timestamp, |
| dx, |
| dy); |
| } |
| |
| break; |
| } |
| default: |
| result_.type = kGestureTypeNull; |
| } |
| } |
| |
| void ImmediateInterpreter::SetHardwareProperties( |
| const HardwareProperties& hw_props) { |
| hw_props_ = hw_props; |
| if (prev_state_.fingers) { |
| free(prev_state_.fingers); |
| prev_state_.fingers = NULL; |
| } |
| prev_state_.fingers = |
| reinterpret_cast<FingerState*>(calloc(hw_props_.max_finger_cnt, |
| sizeof(FingerState))); |
| } |
| |
| } // namespace gestures |
