Add a factory and defines for native Linux surfaces.

ui/base/linux/touch_event_from_evdev_converter.h

+// Copyright (c) 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_BASE_LINUX_EVDEV_DELEGATE_TOUCH_H_
+#define UI_BASE_LINUX_EVDEV_DELEGATE_TOUCH_H_
+
+#include <bitset>
+
+#include "base/message_pump_libevent.h"
+#include "ui/base/events/event_constants.h"
+#include "ui/base/events/event.h"
+#include "ui/base/ui_export.h"
+
+namespace ui {
+
+class TouchEvent;
+
+class UI_EXPORT TouchEventFromEvdevConverter
+    : public base::MessagePumpLibevent::Watcher {
+ public:
+  enum { MAX_FINGERS = 11 };
+  TouchEventFromEvdevConverter(int fd, int id);
+  virtual ~TouchEventFromEvdevConverter();
+
+ private:
+  friend class MockTouchEventFromEvdevConverter;
+
+  // Unsafe part of initialization.
+  void Init();
+
+  // Overidden from base::MessagePumpLibevent::Watcher.
+  void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
+  void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
+
+  // Dispatch a touch event.
+  virtual void DispatchEvent(TouchEvent* tev);
+
+  // Pressure values.
+  int pressure_min_;
+  int pressure_max_;  // Used to normalize pressure values.
+
+  // Touch scaling.
+  float x_scale_;
+  float y_scale_;
+
+  // Touch point currently being updated from the /dev/input/event* stream.
+  int current_slot_;
+
+  // File descriptor for the /dev/input/event* instance.
+  int fd_;
+
+  // Number corresponding to * in the source evdev device: /dev/input/event*
+  int id_;
+
+  // Bit field tracking which in-progress touch points have been modified
+  // without a syn event.
+  std::bitset<MAX_FINGERS> altered_slots_;
+
+  struct InProgressEvents {
+      int x_;
+      int y_;
+      int id_;  // Device reported "unique" touch point id; -1 means not active
+      int finger_;  // "Finger" id starting from 0; -1 means not active
+
+      EventType type_;
+      int major_;
+      float pressure_;
+  };
+
+  // In-progress touch points.
+  InProgressEvents events_[MAX_FINGERS];
+};
+
+}  // namespace ui
+
+#endif  // UI_BASE_LINUX_EVDEV_DELEGATE_TOUCH_H_