ui/events/ozone/evdev/touch_event_converter_evdev.h

   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 base::MessagePumpLibevent::Watcher {
  25  public:
  26   enum {
  27     MAX_FINGERS = 11
  28   };
  29   TouchEventConverterEvdev(int fd,
  30                            base::FilePath path,
  31                            const EventDeviceInfo& info,
  32                            const EventDispatchCallback& dispatch);
  33   virtual ~TouchEventConverterEvdev();
  34
  35   // Start & stop watching for events.
  36   virtual void Start() OVERRIDE;
  37   virtual void Stop() OVERRIDE;
  38
  39  private:
  40   friend class MockTouchEventConverterEvdev;
  41
  42   // Unsafe part of initialization.
  43   void Init(const EventDeviceInfo& info);
  44
  45   // Overidden from base::MessagePumpLibevent::Watcher.
  46   virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
  47   virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
  48
  49   virtual bool Reinitialize();
  50
  51   void ProcessInputEvent(const input_event& input);
  52   void ProcessAbs(const input_event& input);
  53   void ProcessSyn(const input_event& input);
  54
  55   void ReportEvents(base::TimeDelta delta);
  56
  57   // Set if we have seen a SYN_DROPPED and not yet re-synced with the device.
  58   bool syn_dropped_;
  59
  60   // Set if this is a type A device (uses SYN_MT_REPORT).
  61   bool is_type_a_;
  62
  63   // Pressure values.
  64   int pressure_min_;
  65   int pressure_max_;  // Used to normalize pressure values.
  66
  67   // Input range for x-axis.
  68   float x_min_tuxels_;
  69   float x_num_tuxels_;
  70
  71   // Input range for y-axis.
  72   float y_min_tuxels_;
  73   float y_num_tuxels_;
  74
  75   // Output range for x-axis.
  76   float x_min_pixels_;
  77   float x_num_pixels_;
  78
  79   // Output range for y-axis.
  80   float y_min_pixels_;
  81   float y_num_pixels_;
  82
  83   // Touch point currently being updated from the /dev/input/event* stream.
  84   int current_slot_;
  85
  86   // File descriptor for the /dev/input/event* instance.
  87   int fd_;
  88
  89   // Path to input device.
  90   base::FilePath path_;
  91
  92   // Bit field tracking which in-progress touch points have been modified
  93   // without a syn event.
  94   std::bitset<MAX_FINGERS> altered_slots_;
  95
  96   struct InProgressEvents {
  97     float x_;
  98     float y_;
  99     int id_;  // Device reported "unique" touch point id; -1 means not active
 100     int finger_;  // "Finger" id starting from 0; -1 means not active
 101
 102     EventType type_;
 103     float radius_x_;
 104     float radius_y_;
 105     float pressure_;
 106   };
 107
 108   // In-progress touch points.
 109   InProgressEvents events_[MAX_FINGERS];
 110
 111   // Controller for watching the input fd.
 112   base::MessagePumpLibevent::FileDescriptorWatcher controller_;
 113
 114   DISALLOW_COPY_AND_ASSIGN(TouchEventConverterEvdev);
 115 };
 116
 117 }  // namespace ui
 118
 119 #endif  // UI_EVENTS_OZONE_EVDEV_TOUCH_EVENT_CONVERTER_EVDEV_H_