Home | History | Annotate | Download | only in evdev 
      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef UI_EVENTS_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_
      6 #define UI_EVENTS_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_
      7 
      8 #include <bitset>
      9 
     10 #include "base/compiler_specific.h"
     11 #include "base/files/file_path.h"
     12 #include "base/message_loop/message_pump_libevent.h"
     13 #include "ui/events/event_constants.h"
     14 #include "ui/events/ozone/evdev/event_converter_evdev.h"
     15 #include "ui/events/ozone/evdev/event_device_info.h"
     16 #include "ui/events/ozone/evdev/events_ozone_evdev_export.h"
     17 
     18 namespace ui {
     19 
     20 class TouchEvent;
     21 
     22 class EVENTS_OZONE_EVDEV_EXPORT TouchEventConverterEvdev
     23     : public EventConverterEvdev {
     24  public:
     25   enum {
     26     MAX_FINGERS = 11
     27   };
     28   TouchEventConverterEvdev(int fd,
     29                            base::FilePath path,
     30                            const EventDeviceInfo& info,
     31                            const EventDispatchCallback& dispatch);
     32   virtual ~TouchEventConverterEvdev();
     33 
     34  private:
     35   friend class MockTouchEventConverterEvdev;
     36 
     37   // Unsafe part of initialization.
     38   void Init(const EventDeviceInfo& info);
     39 
     40   // Overidden from base::MessagePumpLibevent::Watcher.
     41   virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
     42 
     43   virtual bool Reinitialize();
     44 
     45   void ProcessInputEvent(const input_event& input);
     46   void ProcessAbs(const input_event& input);
     47   void ProcessSyn(const input_event& input);
     48 
     49   void ReportEvents(base::TimeDelta delta);
     50 
     51   // Callback for dispatching events.
     52   EventDispatchCallback callback_;
     53 
     54   // Set if we have seen a SYN_DROPPED and not yet re-synced with the device.
     55   bool syn_dropped_;
     56 
     57   // Set if this is a type A device (uses SYN_MT_REPORT).
     58   bool is_type_a_;
     59 
     60   // Pressure values.
     61   int pressure_min_;
     62   int pressure_max_;  // Used to normalize pressure values.
     63 
     64   // Input range for x-axis.
     65   float x_min_tuxels_;
     66   float x_num_tuxels_;
     67 
     68   // Input range for y-axis.
     69   float y_min_tuxels_;
     70   float y_num_tuxels_;
     71 
     72   // Output range for x-axis.
     73   float x_min_pixels_;
     74   float x_num_pixels_;
     75 
     76   // Output range for y-axis.
     77   float y_min_pixels_;
     78   float y_num_pixels_;
     79 
     80   // Touch point currently being updated from the /dev/input/event* stream.
     81   int current_slot_;
     82 
     83   // Bit field tracking which in-progress touch points have been modified
     84   // without a syn event.
     85   std::bitset<MAX_FINGERS> altered_slots_;
     86 
     87   struct InProgressEvents {
     88     float x_;
     89     float y_;
     90     int id_;  // Device reported "unique" touch point id; -1 means not active
     91     int finger_;  // "Finger" id starting from 0; -1 means not active
     92 
     93     EventType type_;
     94     float radius_x_;
     95     float radius_y_;
     96     float pressure_;
     97   };
     98 
     99   // In-progress touch points.
    100   InProgressEvents events_[MAX_FINGERS];
    101 
    102   DISALLOW_COPY_AND_ASSIGN(TouchEventConverterEvdev);
    103 };
    104 
    105 }  // namespace ui
    106 
    107 #endif  // UI_EVENTS_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_
    108