Extract touchscreen device management into a generic manager

ui/events/x/device_data_manager.h

Index: ui/events/x/device_data_manager.h
diff --git a/ui/events/x/device_data_manager.h b/ui/events/x/device_data_manager.h
deleted file mode 100644
index 1135ec222b89ee5d491f5fae7e130aced0c64bc2..0000000000000000000000000000000000000000
--- a/ui/events/x/device_data_manager.h
+++ /dev/null
@@ -1,309 +0,0 @@
-// Copyright 2013 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.
-
-#ifndef UI_EVENTS_X_DEVICE_DATA_MANAGER_H_
-#define UI_EVENTS_X_DEVICE_DATA_MANAGER_H_
-
-// Generically-named #defines from Xlib is conflicting with symbols in GTest.
-// So many tests .cc file #undef Bool before including device_data_manager.h,
-// which makes Bool unrecognized in XInput2.h.
-#ifndef Bool
-#define Bool int
-#endif
-
-#include <X11/extensions/XInput2.h>
-
-#include <bitset>
-#include <map>
-#include <vector>
-
-#include "base/basictypes.h"
-#include "base/event_types.h"
-#include "base/memory/scoped_ptr.h"
-#include "ui/events/event.h"
-#include "ui/events/event_constants.h"
-#include "ui/events/events_base_export.h"
-#include "ui/gfx/geometry/rect.h"
-#include "ui/gfx/transform.h"
-#include "ui/gfx/x/x11_atom_cache.h"
-
-template <typename T> struct DefaultSingletonTraits;
-
-typedef union _XEvent XEvent;
-
-namespace ui {
-
-// CrOS touchpad metrics gesture types
-enum GestureMetricsType {
-  kGestureMetricsTypeNoisyGround = 0,
-  kGestureMetricsTypeUnknown,
-};
-
-// A class that extracts and tracks the input events data. It currently handles
-// mouse, touchpad and touchscreen devices.
-class EVENTS_BASE_EXPORT DeviceDataManager {
- public:
-  // Enumerate additional data that one might be interested on an input event,
-  // which are usually wrapped in X valuators. If you modify any of this,
-  // make sure to update the kCachedAtoms data structure in the source file
-  // and the k*Type[Start/End] constants used by IsCMTDataType and
-  // IsTouchDataType.
-  enum DataType {
-    // Define the valuators used the CrOS CMT driver. Used by mice and CrOS
-    // touchpads.
-    DT_CMT_SCROLL_X = 0,  // Scroll amount on the X (horizontal) direction.
-    DT_CMT_SCROLL_Y,      // Scroll amount on the Y (vertical) direction.
-    DT_CMT_ORDINAL_X,     // Original (unaccelerated) value on the X direction.
-                          // Can be used both for scrolls and flings.
-    DT_CMT_ORDINAL_Y,     // Original (unaccelerated) value on the Y direction.
-                          // Can be used both for scrolls and flings.
-    DT_CMT_START_TIME,    // Gesture start time.
-    DT_CMT_END_TIME,      // Gesture end time.
-    DT_CMT_FLING_X,       // Fling amount on the X (horizontal) direction.
-    DT_CMT_FLING_Y,       // Fling amount on the Y (vertical) direction.
-    DT_CMT_FLING_STATE,   // The state of fling gesture (whether the user just
-                          // start flinging or that he/she taps down).
-    DT_CMT_METRICS_TYPE,  // Metrics type of the metrics gesture, which are
-                          // used to wrap interesting patterns that we would
-                          // like to track via the UMA system.
-    DT_CMT_METRICS_DATA1, // Complementary data 1 of the metrics gesture.
-    DT_CMT_METRICS_DATA2, // Complementary data 2 of the metrics gesture.
-    DT_CMT_FINGER_COUNT,  // Finger counts in the current gesture. A same type
-                          // of gesture can have very different meanings based
-                          // on that (e.g. 2f scroll v.s. 3f swipe).
-
-    // End of CMT data types.
-    // Beginning of touch data types.
-
-    // Define the valuators following the Multi-touch Protocol. Used by
-    // touchscreen devices.
-    DT_TOUCH_MAJOR,       // Length of the touch area.
-    DT_TOUCH_MINOR,       // Width of the touch area.
-    DT_TOUCH_ORIENTATION, // Angle between the X-axis and the major axis of the
-                          // touch area.
-    DT_TOUCH_PRESSURE,    // Pressure of the touch contact.
-
-    // NOTE for XInput MT: 'Tracking ID' is provided in every touch event to
-    // track individual touch. 'Tracking ID' is an unsigned 32-bit value and
-    // is increased for each new touch. It will wrap back to 0 when reaching
-    // the numerical limit.
-    DT_TOUCH_TRACKING_ID, // ID of the touch point.
-
-    // Kernel timestamp from touch screen (if available).
-    DT_TOUCH_RAW_TIMESTAMP,
-
-    // End of touch data types.
-
-    DT_LAST_ENTRY         // This must come last.
-  };
-
-  // Data struct to store extracted data from an input event.
-  typedef std::map<int, double> EventData;
-
-  // We use int because enums can be casted to ints but not vice versa.
-  static bool IsCMTDataType(const int type);
-  static bool IsTouchDataType(const int type);
-
-  // Returns the DeviceDataManager singleton.
-  static DeviceDataManager* GetInstance();
-
-  // Returns if XInput2 is available on the system.
-  bool IsXInput2Available() const;
-
-  // Updates the list of devices.
-  void UpdateDeviceList(Display* display);
-
-  // For multitouch events we use slot number to distinguish touches from
-  // different fingers. This function returns true if the associated slot
-  // for |xiev| can be found and it is saved in |slot|, returns false if
-  // no slot can be found.
-  bool GetSlotNumber(const XIDeviceEvent* xiev, int* slot);
-
-  // Get all event data in one pass. We extract only data types that we know
-  // about (defined in enum DataType). The data is not processed (e.g. not
-  // filled in by cached values) as in GetEventData.
-  void GetEventRawData(const XEvent& xev, EventData* data);
-
-  // Get a datum of the specified type. Return true and the value
-  // is updated if the data is found, false and value unchanged if the data is
-  // not found. In the case of MT-B/XI2.2, the value can come from a previously
-  // cached one (see the comment above last_seen_valuator_).
-  bool GetEventData(const XEvent& xev, const DataType type, double* value);
-
-  // Check if the event is an XI input event in the strict sense
-  // (i.e. XIDeviceEvent). This rules out things like hierarchy changes,
-  /// device changes, property changes and so on.
-  bool IsXIDeviceEvent(const base::NativeEvent& native_event) const;
-
-  // Check if the event comes from touchpad devices.
-  bool IsTouchpadXInputEvent(const base::NativeEvent& native_event) const;
-
-  // Check if the event comes from devices running CMT driver or using
-  // CMT valuators (e.g. mouses). Note that doesn't necessarily mean the event
-  // is a CMT event (e.g. it could be a mouse pointer move).
-  bool IsCMTDeviceEvent(const base::NativeEvent& native_event) const;
-
-  // Check if the event is one of the CMT gesture events (scroll, fling,
-  // metrics etc.).
-  bool IsCMTGestureEvent(const base::NativeEvent& native_event) const;
-
-  // Returns true if the event is of the specific type, false if not.
-  bool IsScrollEvent(const base::NativeEvent& native_event) const;
-  bool IsFlingEvent(const base::NativeEvent& native_event) const;
-  bool IsCMTMetricsEvent(const base::NativeEvent& native_event) const;
-
-  // Returns true if the event has CMT start/end timestamps.
-  bool HasGestureTimes(const base::NativeEvent& native_event) const;
-
-  // Extract data from a scroll event (a motion event with the necessary
-  // valuators). User must first verify the event type with IsScrollEvent.
-  // Pointers shouldn't be NULL.
-  void GetScrollOffsets(const base::NativeEvent& native_event,
-                        float* x_offset,
-                        float* y_offset,
-                        float* x_offset_ordinal,
-                        float* y_offset_ordinal,
-                        int* finger_count);
-
-  // Extract data from a fling event. User must first verify the event type
-  // with IsFlingEvent. Pointers shouldn't be NULL.
-  void GetFlingData(const base::NativeEvent& native_event,
-                    float* vx,
-                    float* vy,
-                    float* vx_ordinal,
-                    float* vy_ordinal,
-                    bool* is_cancel);
-
-  // Extract data from a CrOS metrics gesture event. User must first verify
-  // the event type with IsCMTMetricsEvent. Pointers shouldn't be NULL.
-  void GetMetricsData(const base::NativeEvent& native_event,
-                      GestureMetricsType* type,
-                      float* data1,
-                      float* data2);
-
-  // Returns the mapped button.
-  int GetMappedButton(int button);
-
-  // Updates button mapping. This is usually called when a MappingNotify event
-  // is received.
-  void UpdateButtonMap();
-
-  // Extract the start/end timestamps from CMT events. User must first verify
-  // the event with HasGestureTimes. Pointers shouldn't be NULL.
-  void GetGestureTimes(const base::NativeEvent& native_event,
-                       double* start_time,
-                       double* end_time);
-
-  // Normalize the data value on deviceid to fall into [0, 1].
-  // *value = (*value - min_value_of_tp) / (max_value_of_tp - min_value_of_tp)
-  // Returns true and sets the normalized value in|value| if normalization is
-  // successful. Returns false and |value| is unchanged otherwise.
-  bool NormalizeData(unsigned int deviceid,
-                     const DataType type,
-                     double* value);
-
-  // Extract the range of the data type. Return true if the range is available
-  // and written into min & max, false if the range is not available.
-  bool GetDataRange(unsigned int deviceid,
-                    const DataType type,
-                    double* min,
-                    double* max);
-
-  // Sets up relevant valuator informations for device ids in the device lists.
-  // This function is only for test purpose. It does not query the X server for
-  // the actual device info, but rather inits the relevant valuator structures
-  // to have safe default values for testing.
-  void SetDeviceListForTest(const std::vector<unsigned int>& touchscreen,
-                            const std::vector<unsigned int>& cmt_devices);
-
-  void SetValuatorDataForTest(XIDeviceEvent* xievent,
-                              DataType type,
-                              double value);
-
-  void ClearTouchTransformerRecord();
-  void UpdateTouchInfoForDisplay(int64 display_id,
-                                 int touch_device_id,
-                                 const gfx::Transform& touch_transformer);
-  void ApplyTouchTransformer(int touch_device_id, float* x, float* y);
-  int64 GetDisplayForTouchDevice(int touch_device_id) const;
-  bool TouchEventNeedsCalibrate(int touch_device_id) const;
-
- private:
-  // Requirement for Singleton.
-  friend struct DefaultSingletonTraits<DeviceDataManager>;
-
-  DeviceDataManager();
-  ~DeviceDataManager();
-
-  // Initialize the XInput related system information.
-  bool InitializeXInputInternal();
-
-  // Check if an XI event contains data of the specified type.
-  bool HasEventData(const XIDeviceEvent* xiev, const DataType type) const;
-
-  void InitializeValuatorsForTest(int deviceid,
-                                  int start_valuator,
-                                  int end_valuator,
-                                  double min_value,
-                                  double max_value);
-
-  bool IsTouchDeviceIdValid(int touch_device_id) const;
-
-  static const int kMaxDeviceNum = 128;
-  static const int kMaxXIEventType = XI_LASTEVENT + 1;
-  static const int kMaxSlotNum = 10;
-
-  // Major opcode for the XInput extension. Used to identify XInput events.
-  int xi_opcode_;
-
-  // A quick lookup table for determining if the XI event is an XIDeviceEvent.
-  std::bitset<kMaxXIEventType> xi_device_event_types_;
-
-  // A quick lookup table for determining if events from the pointer device
-  // should be processed.
-  std::bitset<kMaxDeviceNum> cmt_devices_;
-  std::bitset<kMaxDeviceNum> touchpads_;
-
-  // Number of valuators on the specific device.
-  int valuator_count_[kMaxDeviceNum];
-
-  // Index table to find the valuator for DataType on the specific device
-  // by valuator_lookup_[device_id][data_type].
-  std::vector<int> valuator_lookup_[kMaxDeviceNum];
-
-  // Index table to find the DataType for valuator on the specific device
-  // by data_type_lookup_[device_id][valuator].
-  std::vector<int> data_type_lookup_[kMaxDeviceNum];
-
-  // Index table to find the min & max value of the Valuator on a specific
-  // device.
-  std::vector<double> valuator_min_[kMaxDeviceNum];
-  std::vector<double> valuator_max_[kMaxDeviceNum];
-
-  // Table to keep track of the last seen value for the specified valuator for
-  // a specified slot of a device. Defaults to 0 if the valuator for that slot
-  // was not specified in an earlier event. With MT-B/XI2.2, valuators in an
-  // XEvent are not reported if the values haven't changed from the previous
-  // event. So it is necessary to remember these valuators so that chrome
-  // doesn't think X/device doesn't know about the valuators. We currently
-  // use this only on touchscreen devices.
-  std::vector<double> last_seen_valuator_[kMaxDeviceNum][kMaxSlotNum];
-
-  // X11 atoms cache.
-  X11AtomCache atom_cache_;
-
-  unsigned char button_map_[256];
-  int button_map_count_;
-
-  // Table to keep track of which display id is mapped to which touch device.
-  int64 touch_device_to_display_map_[kMaxDeviceNum];
-  // Index table to find the TouchTransformer for a touch device.
-  gfx::Transform touch_device_transformer_map_[kMaxDeviceNum];
-
-  DISALLOW_COPY_AND_ASSIGN(DeviceDataManager);
-};
-
-}  // namespace ui
-
-#endif  // UI_EVENTS_X_DEVICE_DATA_MANAGER_H_