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Commit 1af8b968 authored by Derek Wu's avatar Derek Wu
Browse files

Add flag to enable jerk prediction pruning. 

For now this flag will simply allow all motion predictions (no-op).

Test: atest libinput_tests
Bug: 266747654
Change-Id: I7f8254bb4ea6702fecbb8cd8cfa568dbd06e4f37
parent 0c81eb0a

libs/input/MotionPredictor.cpp

+12 −1
Original line number Diff line number Diff line
@@ -22,17 +22,21 @@ 
#include <cmath>

#include <cstddef>

#include <cstdint>

#include <limits>

#include <string>

#include <vector>



#include <android-base/logging.h>

#include <android-base/strings.h>

#include <android/input.h>

#include <com_android_input_flags.h>



#include <attestation/HmacKeyManager.h>

#include <ftl/enum.h>

#include <input/TfLiteMotionPredictor.h>



namespace input_flags = com::android::input::flags;



namespace android {

namespace {
@@ -197,7 +201,14 @@ std::unique_ptr<MotionEvent> MotionPredictor::predict(nsecs_t timestamp) { 
            // device starts to speed up, but avoids producing noisy predictions as it slows down.

            break;

        }

        // TODO(b/266747654): Stop predictions if confidence is < some threshold.

        if (input_flags::enable_jerk_prediction_pruning()) {

            // TODO(b/266747654): Stop predictions if confidence is < some threshold

            // Arbitrarily high pruning index, will correct once jerk thresholding is implemented.

            const size_t upperBoundPredictionIndex = std::numeric_limits<size_t>::max();

            if (i > upperBoundPredictionIndex) {

                break;

            }

        }



        const TfLiteMotionPredictorSample::Point predictedPoint =

                convertPrediction(axisFrom, axisTo, predictedR[i], predictedPhi[i]);

libs/input/input_flags.aconfig

+7 −0
Original line number Diff line number Diff line
@@ -128,3 +128,10 @@ flag { 
  description: "Enable fling scrolling to be stopped by putting a finger on the touchpad again"

  bug: "281106755"

}



flag {

  name: "enable_jerk_prediction_pruning"

  namespace: "input"

  description: "Enable prediction pruning based on jerk thresholds."

  bug: "266747654"

}