ozone: evdev: Add libgestures bindings for touchpad & mouse support

ui/events/ozone/evdev/libgestures_glue/gesture_interpreter_libevdev_cros.cc

+// Copyright 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "ui/events/ozone/evdev/libgestures_glue/gesture_interpreter_libevdev_cros.h"
+
+#include <gestures/gestures.h>
+#include <libevdev/libevdev.h>
+
+#include "base/strings/stringprintf.h"
+#include "base/timer/timer.h"
+#include "ui/events/event.h"
+#include "ui/events/ozone/evdev/cursor_delegate_evdev.h"
+#include "ui/events/ozone/evdev/event_modifiers_evdev.h"
+#include "ui/events/ozone/evdev/libgestures_glue/gesture_timer_provider.h"
+#include "ui/gfx/geometry/point_f.h"
+
+namespace ui {
+
+namespace {
+
+// Convert libevdev device class to libgestures device class.
+GestureInterpreterDeviceClass GestureDeviceClass(Evdev* evdev) {
+  switch (evdev->info.evdev_class) {
+    case EvdevClassMouse:
+      return GESTURES_DEVCLASS_MOUSE;
+    case EvdevClassMultitouchMouse:
+      return GESTURES_DEVCLASS_MULTITOUCH_MOUSE;
+    case EvdevClassTouchpad:
+      return GESTURES_DEVCLASS_TOUCHPAD;
+    case EvdevClassTouchscreen:
+      return GESTURES_DEVCLASS_TOUCHSCREEN;
+    default:
+      return GESTURES_DEVCLASS_UNKNOWN;
+  }
+}
+
+// Convert libevdev state to libgestures hardware properties.
+HardwareProperties GestureHardwareProperties(Evdev* evdev) {
+  HardwareProperties hwprops;
+  hwprops.left = Event_Get_Left(evdev);
+  hwprops.top = Event_Get_Top(evdev);
+  hwprops.right = Event_Get_Right(evdev);
+  hwprops.bottom = Event_Get_Bottom(evdev);
+  hwprops.res_x = Event_Get_Res_X(evdev);
+  hwprops.res_y = Event_Get_Res_Y(evdev);
+  hwprops.screen_x_dpi = 133;
+  hwprops.screen_y_dpi = 133;
+  hwprops.orientation_minimum = Event_Get_Orientation_Minimum(evdev);
+  hwprops.orientation_maximum = Event_Get_Orientation_Maximum(evdev);
+  hwprops.max_finger_cnt = Event_Get_Slot_Count(evdev);
+  hwprops.max_touch_cnt = Event_Get_Touch_Count_Max(evdev);
+  hwprops.supports_t5r2 = Event_Get_T5R2(evdev);
+  hwprops.support_semi_mt = Event_Get_Semi_MT(evdev);
+  /* buttonpad means a physical button under the touch surface */
+  hwprops.is_button_pad = Event_Get_Button_Pad(evdev);
+  return hwprops;
+}
+
+// Callback from libgestures when a gesture is ready.
+void OnGestureReadyHelper(void* client_data, const Gesture* gesture) {
+  GestureInterpreterLibevdevCros* interpreter =
+      static_cast<GestureInterpreterLibevdevCros*>(client_data);
+  interpreter->OnGestureReady(gesture);
+}
+
+// Convert gestures timestamp (stime_t) to ui::Event timestamp.
+base::TimeDelta StimeToTimedelta(stime_t timestamp) {
+  return base::TimeDelta::FromMicroseconds(timestamp *
+                                           base::Time::kMicrosecondsPerSecond);
+}
+
+// Number of fingers for scroll gestures.
+const int kGestureScrollFingerCount = 2;
+
+}  // namespace
+
+GestureInterpreterLibevdevCros::GestureInterpreterLibevdevCros(
+    EventModifiersEvdev* modifiers,
+    CursorDelegateEvdev* cursor,
+    const EventDispatchCallback& callback)
+    : modifiers_(modifiers),
+      cursor_(cursor),
+      dispatch_callback_(callback),
+      interpreter_(NULL) {}
+
+GestureInterpreterLibevdevCros::~GestureInterpreterLibevdevCros() {
+  if (interpreter_) {
+    DeleteGestureInterpreter(interpreter_);
+    interpreter_ = NULL;
+  }
+}
+
+void GestureInterpreterLibevdevCros::OnLibEvdevCrosOpen(
+    Evdev* evdev,
+    EventStateRec* evstate) {
+  CHECK(evdev->info.is_monotonic) << "libevdev must use monotonic timestamps";
+  VLOG(9) << "HACK DO NOT REMOVE OR LINK WILL FAIL" << (void*)gestures_log;
+
+  HardwareProperties hwprops = GestureHardwareProperties(evdev);
+  GestureInterpreterDeviceClass devclass = GestureDeviceClass(evdev);
+
+  // Create & initialize GestureInterpreter.
+  CHECK(!interpreter_);
+  interpreter_ = NewGestureInterpreter();
+  GestureInterpreterInitialize(interpreter_, devclass);
+  GestureInterpreterSetHardwareProperties(interpreter_, &hwprops);
+  GestureInterpreterSetTimerProvider(
+      interpreter_,
+      const_cast<GesturesTimerProvider*>(&kGestureTimerProvider),
+      this);
+  GestureInterpreterSetCallback(interpreter_, OnGestureReadyHelper, this);
+}
+
+void GestureInterpreterLibevdevCros::OnLibEvdevCrosEvent(Evdev* evdev,
+                                                         EventStateRec* evstate,
+                                                         const timeval& time) {
+  HardwareState hwstate;
+  memset(&hwstate, 0, sizeof(hwstate));
+  hwstate.timestamp = StimeFromTimeval(&time);
+
+  // Mouse.
+  hwstate.rel_x = evstate->rel_x;
+  hwstate.rel_y = evstate->rel_y;
+  hwstate.rel_wheel = evstate->rel_wheel;
+  hwstate.rel_hwheel = evstate->rel_hwheel;
+
+  // Touch.
+  FingerState fingers[Event_Get_Slot_Count(evdev)];
+  memset(&fingers, 0, sizeof(fingers));
+  int current_finger = 0;
+  for (int i = 0; i < evstate->slot_count; i++) {
+    MtSlotPtr slot = &evstate->slots[i];
+    if (slot->tracking_id == -1)
+      continue;
+    fingers[current_finger].touch_major = slot->touch_major;
+    fingers[current_finger].touch_minor = slot->touch_minor;
+    fingers[current_finger].width_major = slot->width_major;
+    fingers[current_finger].width_minor = slot->width_minor;
+    fingers[current_finger].pressure = slot->pressure;
+    fingers[current_finger].orientation = slot->orientation;
+    fingers[current_finger].position_x = slot->position_x;
+    fingers[current_finger].position_y = slot->position_y;
+    fingers[current_finger].tracking_id = slot->tracking_id;
+    current_finger++;
+  }
+  hwstate.touch_cnt = Event_Get_Touch_Count(evdev);
+  hwstate.finger_cnt = current_finger;
+  hwstate.fingers = fingers;
+
+  // Buttons.
+  if (Event_Get_Button_Left(evdev))
+    hwstate.buttons_down |= GESTURES_BUTTON_LEFT;
+  if (Event_Get_Button_Middle(evdev))
+    hwstate.buttons_down |= GESTURES_BUTTON_MIDDLE;
+  if (Event_Get_Button_Right(evdev))
+    hwstate.buttons_down |= GESTURES_BUTTON_RIGHT;
+
+  GestureInterpreterPushHardwareState(interpreter_, &hwstate);
+}
+
+void GestureInterpreterLibevdevCros::OnGestureReady(const Gesture* gesture) {
+  switch (gesture->type) {
+    case kGestureTypeMove:
+      OnGestureMove(gesture, &gesture->details.move);
+      break;
+    case kGestureTypeScroll:
+      OnGestureScroll(gesture, &gesture->details.scroll);
+      break;
+    case kGestureTypeButtonsChange:
+      OnGestureButtonsChange(gesture, &gesture->details.buttons);
+      break;
+    case kGestureTypeContactInitiated:
+    case kGestureTypeFling:
+    case kGestureTypeSwipe:
+    case kGestureTypeSwipeLift:
+    case kGestureTypePinch:
+    case kGestureTypeMetrics:
+      // TODO(spang): Support remaining gestures.
+      NOTIMPLEMENTED();
+      break;
+    default:
+      LOG(WARNING) << base::StringPrintf("Unrecognized gesture type (%u)",
+                                         gesture->type);
+      break;
+  }
+}
+
+void GestureInterpreterLibevdevCros::OnGestureMove(const Gesture* gesture,
+                                                   const GestureMove* move) {
+  DVLOG(3) << base::StringPrintf("Gesture Move: (%f, %f) [%f, %f]",
+                                 move->dx,
+                                 move->dy,
+                                 move->ordinal_dx,
+                                 move->ordinal_dy);
+  if (!cursor_)
+    return;  // No cursor!
+  cursor_->MoveCursor(gfx::Vector2dF(move->dx, move->dy));
+  // TODO(spang): Use move->ordinal_dx, move->ordinal_dy
+  // TODO(spang): Use move->start_time, move->end_time
+  MouseEvent event(ET_MOUSE_MOVED,
+                   cursor_->location(),
+                   cursor_->location(),
+                   modifiers_->GetModifierFlags(),
+                   /* changed_button_flags */ 0);
+  Dispatch(&event);
+}
+
+void GestureInterpreterLibevdevCros::OnGestureScroll(
+    const Gesture* gesture,
+    const GestureScroll* scroll) {
+  DVLOG(3) << base::StringPrintf("Gesture Scroll: (%f, %f) [%f, %f]",
+                                 scroll->dx,
+                                 scroll->dy,
+                                 scroll->ordinal_dx,
+                                 scroll->ordinal_dy);
+  // TODO(spang): Support SetNaturalScroll
+  // TODO(spang): Use scroll->start_time
+  ScrollEvent event(ET_SCROLL,
+                    cursor_->location(),
+                    StimeToTimedelta(gesture->end_time),
+                    modifiers_->GetModifierFlags(),
+                    scroll->dx,
+                    scroll->dy,
+                    scroll->ordinal_dx,
+                    scroll->ordinal_dy,
+                    kGestureScrollFingerCount);
+  Dispatch(&event);
+}
+
+void GestureInterpreterLibevdevCros::OnGestureButtonsChange(
+    const Gesture* gesture,
+    const GestureButtonsChange* buttons) {
+  DVLOG(3) << base::StringPrintf("Gesture Button Change: down=0x%02x up=0x%02x",
+                                 buttons->down,
+                                 buttons->up);
+  // TODO(spang): Use buttons->start_time, buttons->end_time
+  if (buttons->down & GESTURES_BUTTON_LEFT)
+    DispatchMouseButton(EVDEV_MODIFIER_LEFT_MOUSE_BUTTON, true);
+  if (buttons->down & GESTURES_BUTTON_MIDDLE)
+    DispatchMouseButton(EVDEV_MODIFIER_MIDDLE_MOUSE_BUTTON, true);
+  if (buttons->down & GESTURES_BUTTON_RIGHT)
+    DispatchMouseButton(EVDEV_MODIFIER_RIGHT_MOUSE_BUTTON, true);
+  if (buttons->up & GESTURES_BUTTON_LEFT)
+    DispatchMouseButton(EVDEV_MODIFIER_LEFT_MOUSE_BUTTON, false);
+  if (buttons->up & GESTURES_BUTTON_MIDDLE)
+    DispatchMouseButton(EVDEV_MODIFIER_MIDDLE_MOUSE_BUTTON, false);
+  if (buttons->up & GESTURES_BUTTON_RIGHT)
+    DispatchMouseButton(EVDEV_MODIFIER_RIGHT_MOUSE_BUTTON, false);
+}
+
+void GestureInterpreterLibevdevCros::Dispatch(Event* event) {
+  dispatch_callback_.Run(event);
+}
+
+void GestureInterpreterLibevdevCros::DispatchMouseButton(unsigned int modifier,
+                                                         bool down) {
+  const gfx::PointF& loc = cursor_->location();
+  int flag = modifiers_->GetEventFlagFromModifier(modifier);
+  EventType type = (down ? ET_MOUSE_PRESSED : ET_MOUSE_RELEASED);
+  modifiers_->UpdateModifier(modifier, down);
+  MouseEvent event(type, loc, loc, modifiers_->GetModifierFlags() | flag, flag);
+  Dispatch(&event);
+}
+
+}  // namespace ui