4 files changed, 42 insertions, 5 deletions
diff --git a/include/input/InputEventLabels.h b/include/input/InputEventLabels.h
index c282cf0b22..4b33a96adf 100644
--- a/include/input/InputEventLabels.h
+++ b/include/input/InputEventLabels.h
@@ -324,6 +324,7 @@ static const InputEventLabel KEYCODES[] = {
     DEFINE_KEYCODE(SYSTEM_NAVIGATION_LEFT),
     DEFINE_KEYCODE(SYSTEM_NAVIGATION_RIGHT),
     DEFINE_KEYCODE(ALL_APPS),
+    DEFINE_KEYCODE(REFRESH),
 
     { NULL, 0 }
 };
diff --git a/include/input/InputTransport.h b/include/input/InputTransport.h
index ea1d2aa41f..1ea2c2cc07 100644
--- a/include/input/InputTransport.h
+++ b/include/input/InputTransport.h
@@ -31,7 +31,6 @@
 #include <utils/Errors.h>
 #include <utils/Timers.h>
 #include <utils/RefBase.h>
-#include <utils/String8.h>
 #include <utils/Vector.h>
 #include <utils/BitSet.h>
 
@@ -142,16 +141,16 @@ protected:
     virtual ~InputChannel();
 
 public:
-    InputChannel(const String8& name, int fd);
+    InputChannel(const std::string& name, int fd);
 
     /* Creates a pair of input channels.
      *
      * Returns OK on success.
      */
-    static status_t openInputChannelPair(const String8& name,
+    static status_t openInputChannelPair(const std::string& name,
             sp<InputChannel>& outServerChannel, sp<InputChannel>& outClientChannel);
 
-    inline String8 getName() const { return mName; }
+    inline std::string getName() const { return mName; }
     inline int getFd() const { return mFd; }
 
     /* Sends a message to the other endpoint.
@@ -183,7 +182,7 @@ public:
     sp<InputChannel> dup() const;
 
 private:
-    String8 mName;
+    std::string mName;
     int mFd;
 };
 
diff --git a/include/input/KeyCharacterMap.h b/include/input/KeyCharacterMap.h
index 79359277c7..33d2757ec8 100644
--- a/include/input/KeyCharacterMap.h
+++ b/include/input/KeyCharacterMap.h
@@ -51,6 +51,9 @@ public:
         KEYBOARD_TYPE_PREDICTIVE = 2,
         KEYBOARD_TYPE_ALPHA = 3,
         KEYBOARD_TYPE_FULL = 4,
+        /**
+         * Deprecated. Set 'keyboard.specialFunction' to '1' in the device's IDC file instead.
+         */
         KEYBOARD_TYPE_SPECIAL_FUNCTION = 5,
         KEYBOARD_TYPE_OVERLAY = 6,
     };
diff --git a/include/input/VelocityTracker.h b/include/input/VelocityTracker.h
index 795f575a2e..ffa1614b55 100644
--- a/include/input/VelocityTracker.h
+++ b/include/input/VelocityTracker.h
@@ -264,6 +264,40 @@ private:
     Movement mMovements[HISTORY_SIZE];
 };
 
+class ImpulseVelocityTrackerStrategy : public VelocityTrackerStrategy {
+public:
+    ImpulseVelocityTrackerStrategy();
+    virtual ~ImpulseVelocityTrackerStrategy();
+
+    virtual void clear();
+    virtual void clearPointers(BitSet32 idBits);
+    virtual void addMovement(nsecs_t eventTime, BitSet32 idBits,
+            const VelocityTracker::Position* positions);
+    virtual bool getEstimator(uint32_t id, VelocityTracker::Estimator* outEstimator) const;
+
+private:
+    // Sample horizon.
+    // We don't use too much history by default since we want to react to quick
+    // changes in direction.
+    static constexpr nsecs_t HORIZON = 100 * 1000000; // 100 ms
+
+    // Number of samples to keep.
+    static constexpr size_t HISTORY_SIZE = 20;
+
+    struct Movement {
+        nsecs_t eventTime;
+        BitSet32 idBits;
+        VelocityTracker::Position positions[MAX_POINTERS];
+
+        inline const VelocityTracker::Position& getPosition(uint32_t id) const {
+            return positions[idBits.getIndexOfBit(id)];
+        }
+    };
+
+    size_t mIndex;
+    Movement mMovements[HISTORY_SIZE];
+};
+
 } // namespace android
 
 #endif // _LIBINPUT_VELOCITY_TRACKER_H