am 86ea1f5f: Initial checkin of spot presentation for touchpad gestures. (DO NOT MERGE)

* commit '86ea1f5f521981d075aef56f11693e4f3bc32fdb':
  Initial checkin of spot presentation for touchpad gestures. (DO NOT MERGE)

3 files changed, 16 insertions, 1 deletions

diff --git a/include/ui/Input.h b/include/ui/Input.h
index 1ef36d0079..fb6152e9f3 100644
--- a/include/ui/Input.h
+++ b/include/ui/Input.h
@@ -608,6 +608,11 @@ private:
     // Oldest sample to consider when calculating the velocity.
     static const nsecs_t MAX_AGE = 200 * 1000000; // 200 ms
 
+    // When the total duration of the window of samples being averaged is less
+    // than the window size, the resulting velocity is scaled to reduce the impact
+    // of overestimation in short traces.
+    static const nsecs_t MIN_WINDOW = 100 * 1000000; // 100 ms
+
     // The minimum duration between samples when estimating velocity.
     static const nsecs_t MIN_DURATION = 10 * 1000000; // 10 ms
 
diff --git a/libs/ui/Input.cpp b/libs/ui/Input.cpp
index 0a53d69bef..684c332d11 100644
--- a/libs/ui/Input.cpp
+++ b/libs/ui/Input.cpp
@@ -831,6 +831,7 @@ bool VelocityTracker::getVelocity(uint32_t id, float* outVx, float* outVy) const
         const Position& oldestPosition =
                 oldestMovement.positions[oldestMovement.idBits.getIndexOfBit(id)];
         nsecs_t lastDuration = 0;
+
         while (numTouches-- > 1) {
             if (++index == HISTORY_SIZE) {
                 index = 0;
@@ -857,6 +858,14 @@ bool VelocityTracker::getVelocity(uint32_t id, float* outVx, float* outVy) const
 
         // Make sure we used at least one sample.
         if (samplesUsed != 0) {
+            // Scale the velocity linearly if the window of samples is small.
+            nsecs_t totalDuration = newestMovement.eventTime - oldestMovement.eventTime;
+            if (totalDuration < MIN_WINDOW) {
+                float scale = float(totalDuration) / float(MIN_WINDOW);
+                accumVx *= scale;
+                accumVy *= scale;
+            }
+
             *outVx = accumVx;
             *outVy = accumVy;
             return true;
diff --git a/libs/utils/Looper.cpp b/libs/utils/Looper.cpp
index d5dd126065..b54fb9dd73 100644
--- a/libs/utils/Looper.cpp
+++ b/libs/utils/Looper.cpp
@@ -662,7 +662,8 @@ void Looper::wakeAndLock() {
 #endif
 
 void Looper::sendMessage(const sp<MessageHandler>& handler, const Message& message) {
-    sendMessageAtTime(LLONG_MIN, handler, message);
+    nsecs_t now = systemTime(SYSTEM_TIME_MONOTONIC);
+    sendMessageAtTime(now, handler, message);
 }
 
 void Looper::sendMessageDelayed(nsecs_t uptimeDelay, const sp<MessageHandler>& handler,