diff --git a/services/inputflinger/UnwantedInteractionBlocker.cpp b/services/inputflinger/UnwantedInteractionBlocker.cpp
new file mode 100644
index 0000000..64dbb8c
--- /dev/null
+++ b/services/inputflinger/UnwantedInteractionBlocker.cpp
@@ -0,0 +1,687 @@
+/*
+ * Copyright (C) 2022 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#define LOG_TAG "UnwantedInteractionBlocker"
+#include "UnwantedInteractionBlocker.h"
+
+#include <android-base/stringprintf.h>
+#include <inttypes.h>
+#include <linux/input-event-codes.h>
+#include <linux/input.h>
+#include <server_configurable_flags/get_flags.h>
+
+#include "ui/events/ozone/evdev/touch_filter/neural_stylus_palm_detection_filter.h"
+#include "ui/events/ozone/evdev/touch_filter/palm_model/onedevice_train_palm_detection_filter_model.h"
+
+using android::base::StringPrintf;
+
+namespace android {
+
+// Category (=namespace) name for the input settings that are applied at boot time
+static const char* INPUT_NATIVE_BOOT = "input_native_boot";
+/**
+ * Feature flag name. This flag determines whether palm rejection is enabled. To enable, specify
+ * 'true' (not case sensitive) or '1'. To disable, specify any other value.
+ */
+static const char* PALM_REJECTION_ENABLED = "palm_rejection_enabled";
+
+static std::string toLower(std::string s) {
+    std::transform(s.begin(), s.end(), s.begin(), [](unsigned char c) { return std::tolower(c); });
+    return s;
+}
+
+static bool isFromTouchscreen(int32_t source) {
+    return isFromSource(source, AINPUT_SOURCE_TOUCHSCREEN);
+}
+
+static ::base::TimeTicks toChromeTimestamp(nsecs_t eventTime) {
+    return ::base::TimeTicks::UnixEpoch() +
+            ::base::Milliseconds(static_cast<float>(ns2ms(eventTime)));
+}
+
+/**
+ * Return true if palm rejection is enabled via the server configurable flags. Return false
+ * otherwise.
+ */
+static bool isPalmRejectionEnabled() {
+    std::string value = toLower(
+            server_configurable_flags::GetServerConfigurableFlag(INPUT_NATIVE_BOOT,
+                                                                 PALM_REJECTION_ENABLED, "false"));
+    if (value == "true" || value == "1") {
+        return true;
+    }
+    return false;
+}
+
+static int getLinuxToolType(int32_t toolType) {
+    switch (toolType) {
+        case AMOTION_EVENT_TOOL_TYPE_FINGER:
+            return MT_TOOL_FINGER;
+        case AMOTION_EVENT_TOOL_TYPE_STYLUS:
+            return MT_TOOL_PEN;
+        case AMOTION_EVENT_TOOL_TYPE_PALM:
+            return MT_TOOL_PALM;
+    }
+    ALOGW("Got tool type %" PRId32 ", converting to MT_TOOL_FINGER", toolType);
+    return MT_TOOL_FINGER;
+}
+
+static std::string addPrefix(std::string str, const std::string& prefix) {
+    std::stringstream ss;
+    bool newLineStarted = true;
+    for (const auto& ch : str) {
+        if (newLineStarted) {
+            ss << prefix;
+            newLineStarted = false;
+        }
+        if (ch == '\n') {
+            newLineStarted = true;
+        }
+        ss << ch;
+    }
+    return ss.str();
+}
+
+template <typename T>
+static std::string dumpSet(const std::set<T>& v) {
+    static_assert(std::is_integral<T>::value, "Only integral types can be printed.");
+    std::string out;
+    for (const T& entry : v) {
+        out += out.empty() ? "{" : ", ";
+        out += android::base::StringPrintf("%i", entry);
+    }
+    return out.empty() ? "{}" : (out + "}");
+}
+
+template <typename K, typename V>
+static std::string dumpMap(const std::map<K, V>& map) {
+    static_assert(std::is_integral<K>::value, "Keys should have integral type to be printed.");
+    static_assert(std::is_integral<V>::value, "Values should have integral type to be printed.");
+    std::string out;
+    for (const auto& [k, v] : map) {
+        if (!out.empty()) {
+            out += "\n";
+        }
+        out += android::base::StringPrintf("%i : %i", static_cast<int>(k), static_cast<int>(v));
+    }
+    return out;
+}
+
+static std::string dumpDeviceInfo(const AndroidPalmFilterDeviceInfo& info) {
+    std::string out;
+    out += StringPrintf("max_x = %.2f\n", info.max_x);
+    out += StringPrintf("max_y = %.2f\n", info.max_y);
+    out += StringPrintf("x_res = %.2f\n", info.x_res);
+    out += StringPrintf("y_res = %.2f\n", info.y_res);
+    out += StringPrintf("major_radius_res = %.2f\n", info.major_radius_res);
+    out += StringPrintf("minor_radius_res = %.2f\n", info.minor_radius_res);
+    out += StringPrintf("minor_radius_supported = %s\n",
+                        info.minor_radius_supported ? "true" : "false");
+    out += StringPrintf("touch_major_res = %" PRId32 "\n", info.touch_major_res);
+    out += StringPrintf("touch_minor_res = %" PRId32 "\n", info.touch_minor_res);
+    return out;
+}
+
+static int32_t getActionUpForPointerId(const NotifyMotionArgs& args, int32_t pointerId) {
+    for (size_t i = 0; i < args.pointerCount; i++) {
+        if (pointerId == args.pointerProperties[i].id) {
+            return AMOTION_EVENT_ACTION_POINTER_UP |
+                    (i << AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT);
+        }
+    }
+    LOG_ALWAYS_FATAL("Can't find pointerId %" PRId32 " in %s", pointerId, args.dump().c_str());
+}
+
+/**
+ * Find the action for individual pointer at the given pointer index.
+ * This is always equal to MotionEvent::getActionMasked, except for
+ * POINTER_UP or POINTER_DOWN events. For example, in a POINTER_UP event, the action for
+ * the active pointer is ACTION_POINTER_UP, while the action for the other pointers is ACTION_MOVE.
+ */
+static int32_t resolveActionForPointer(uint8_t pointerIndex, int32_t action) {
+    const int32_t actionMasked = MotionEvent::getActionMasked(action);
+    if (actionMasked != AMOTION_EVENT_ACTION_POINTER_DOWN &&
+        actionMasked != AMOTION_EVENT_ACTION_POINTER_UP) {
+        return actionMasked;
+    }
+    // This is a POINTER_DOWN or POINTER_UP event
+    const uint8_t actionIndex = MotionEvent::getActionIndex(action);
+    if (pointerIndex == actionIndex) {
+        return actionMasked;
+    }
+    // When POINTER_DOWN or POINTER_UP happens, it's actually a MOVE for all of the other
+    // pointers
+    return AMOTION_EVENT_ACTION_MOVE;
+}
+
+static const char* toString(bool value) {
+    return value ? "true" : "false";
+}
+
+std::string toString(const ::ui::InProgressTouchEvdev& touch) {
+    return StringPrintf("x=%.1f, y=%.1f, tracking_id=%i, slot=%zu,"
+                        " pressure=%.1f, major=%i, minor=%i, "
+                        "tool_type=%i, altered=%s, was_touching=%s, touching=%s",
+                        touch.x, touch.y, touch.tracking_id, touch.slot, touch.pressure,
+                        touch.major, touch.minor, touch.tool_type, toString(touch.altered),
+                        toString(touch.was_touching), toString(touch.touching));
+}
+
+/**
+ * Remove the data for the provided pointers from the args. The pointers are identified by their
+ * pointerId, not by the index inside the array.
+ * Return the new NotifyMotionArgs struct that has the remaining pointers.
+ * The only fields that may be different in the returned args from the provided args are:
+ *     - action
+ *     - pointerCount
+ *     - pointerProperties
+ *     - pointerCoords
+ * Action might change because it contains a pointer index. If another pointer is removed, the
+ * active pointer index would be shifted.
+ * Do not call this function for events with POINTER_UP or POINTER_DOWN events when removed pointer
+ * id is the acting pointer id.
+ *
+ * @param args the args from which the pointers should be removed
+ * @param pointerIds the pointer ids of the pointers that should be removed
+ */
+NotifyMotionArgs removePointerIds(const NotifyMotionArgs& args,
+                                  const std::set<int32_t>& pointerIds) {
+    const uint8_t actionIndex = MotionEvent::getActionIndex(args.action);
+    const int32_t actionMasked = MotionEvent::getActionMasked(args.action);
+    const bool isPointerUpOrDownAction = actionMasked == AMOTION_EVENT_ACTION_POINTER_DOWN ||
+            actionMasked == AMOTION_EVENT_ACTION_POINTER_UP;
+
+    NotifyMotionArgs newArgs{args};
+    newArgs.pointerCount = 0;
+    int32_t newActionIndex = 0;
+    for (uint32_t i = 0; i < args.pointerCount; i++) {
+        const int32_t pointerId = args.pointerProperties[i].id;
+        if (pointerIds.find(pointerId) != pointerIds.end()) {
+            // skip this pointer
+            if (isPointerUpOrDownAction && i == actionIndex) {
+                // The active pointer is being removed, so the action is no longer valid.
+                // Set the action to 'UNKNOWN' here. The caller is responsible for updating this
+                // action later to a proper value.
+                newArgs.action = ACTION_UNKNOWN;
+            }
+            continue;
+        }
+        newArgs.pointerProperties[newArgs.pointerCount].copyFrom(args.pointerProperties[i]);
+        newArgs.pointerCoords[newArgs.pointerCount].copyFrom(args.pointerCoords[i]);
+        if (i == actionIndex) {
+            newActionIndex = newArgs.pointerCount;
+        }
+        newArgs.pointerCount++;
+    }
+    // Update POINTER_DOWN or POINTER_UP actions
+    if (isPointerUpOrDownAction && newArgs.action != ACTION_UNKNOWN) {
+        newArgs.action =
+                actionMasked | (newActionIndex << AMOTION_EVENT_ACTION_POINTER_INDEX_SHIFT);
+        // Convert POINTER_DOWN and POINTER_UP to DOWN and UP if there's only 1 pointer remaining
+        if (newArgs.pointerCount == 1) {
+            if (actionMasked == AMOTION_EVENT_ACTION_POINTER_DOWN) {
+                newArgs.action = AMOTION_EVENT_ACTION_DOWN;
+            } else if (actionMasked == AMOTION_EVENT_ACTION_POINTER_UP) {
+                newArgs.action = AMOTION_EVENT_ACTION_UP;
+            }
+        }
+    }
+    return newArgs;
+}
+
+std::optional<AndroidPalmFilterDeviceInfo> createPalmFilterDeviceInfo(
+        const InputDeviceInfo& deviceInfo) {
+    if (!isFromTouchscreen(deviceInfo.getSources())) {
+        return std::nullopt;
+    }
+    AndroidPalmFilterDeviceInfo out;
+    const InputDeviceInfo::MotionRange* axisX =
+            deviceInfo.getMotionRange(AMOTION_EVENT_AXIS_X, AINPUT_SOURCE_TOUCHSCREEN);
+    if (axisX != nullptr) {
+        out.max_x = axisX->max;
+        out.x_res = axisX->resolution;
+    } else {
+        ALOGW("Palm rejection is disabled for %s because AXIS_X is not supported",
+              deviceInfo.getDisplayName().c_str());
+        return std::nullopt;
+    }
+    const InputDeviceInfo::MotionRange* axisY =
+            deviceInfo.getMotionRange(AMOTION_EVENT_AXIS_Y, AINPUT_SOURCE_TOUCHSCREEN);
+    if (axisY != nullptr) {
+        out.max_y = axisY->max;
+        out.y_res = axisY->resolution;
+    } else {
+        ALOGW("Palm rejection is disabled for %s because AXIS_Y is not supported",
+              deviceInfo.getDisplayName().c_str());
+        return std::nullopt;
+    }
+    const InputDeviceInfo::MotionRange* axisMajor =
+            deviceInfo.getMotionRange(AMOTION_EVENT_AXIS_TOUCH_MAJOR, AINPUT_SOURCE_TOUCHSCREEN);
+    if (axisMajor != nullptr) {
+        out.major_radius_res = axisMajor->resolution;
+        out.touch_major_res = axisMajor->resolution;
+    } else {
+        return std::nullopt;
+    }
+    const InputDeviceInfo::MotionRange* axisMinor =
+            deviceInfo.getMotionRange(AMOTION_EVENT_AXIS_TOUCH_MINOR, AINPUT_SOURCE_TOUCHSCREEN);
+    if (axisMinor != nullptr) {
+        out.minor_radius_res = axisMinor->resolution;
+        out.touch_minor_res = axisMinor->resolution;
+        out.minor_radius_supported = true;
+    } else {
+        out.minor_radius_supported = false;
+    }
+
+    return out;
+}
+
+/**
+ * Synthesize CANCEL events for any new pointers that should be canceled, while removing pointers
+ * that have already been canceled.
+ * The flow of the function is as follows:
+ * 1. Remove all already canceled pointers
+ * 2. Cancel all newly suppressed pointers
+ * 3. Decide what to do with the current event : keep it, or drop it
+ * The pointers can never be "unsuppressed": once a pointer is canceled, it will never become valid.
+ */
+std::vector<NotifyMotionArgs> cancelSuppressedPointers(
+        const NotifyMotionArgs& args, const std::set<int32_t>& oldSuppressedPointerIds,
+        const std::set<int32_t>& newSuppressedPointerIds) {
+    LOG_ALWAYS_FATAL_IF(args.pointerCount == 0, "0 pointers in %s", args.dump().c_str());
+
+    // First, let's remove the old suppressed pointers. They've already been canceled previously.
+    NotifyMotionArgs oldArgs = removePointerIds(args, oldSuppressedPointerIds);
+
+    // Cancel any newly suppressed pointers.
+    std::vector<NotifyMotionArgs> out;
+    const int32_t activePointerId =
+            args.pointerProperties[MotionEvent::getActionIndex(args.action)].id;
+    const int32_t actionMasked = MotionEvent::getActionMasked(args.action);
+    // We will iteratively remove pointers from 'removedArgs'.
+    NotifyMotionArgs removedArgs{oldArgs};
+    for (uint32_t i = 0; i < oldArgs.pointerCount; i++) {
+        const int32_t pointerId = oldArgs.pointerProperties[i].id;
+        if (newSuppressedPointerIds.find(pointerId) == newSuppressedPointerIds.end()) {
+            // This is a pointer that should not be canceled. Move on.
+            continue;
+        }
+        if (pointerId == activePointerId && actionMasked == AMOTION_EVENT_ACTION_POINTER_DOWN) {
+            // Remove this pointer, but don't cancel it. We'll just not send the POINTER_DOWN event
+            removedArgs = removePointerIds(removedArgs, {pointerId});
+            continue;
+        }
+
+        if (removedArgs.pointerCount == 1) {
+            // We are about to remove the last pointer, which means there will be no more gesture
+            // remaining. This is identical to canceling all pointers, so just send a single CANCEL
+            // event, without any of the preceding POINTER_UP with FLAG_CANCELED events.
+            oldArgs.flags |= AMOTION_EVENT_FLAG_CANCELED;
+            oldArgs.action = AMOTION_EVENT_ACTION_CANCEL;
+            return {oldArgs};
+        }
+        // Cancel the current pointer
+        out.push_back(removedArgs);
+        out.back().flags |= AMOTION_EVENT_FLAG_CANCELED;
+        out.back().action = getActionUpForPointerId(out.back(), pointerId);
+
+        // Remove the newly canceled pointer from the args
+        removedArgs = removePointerIds(removedArgs, {pointerId});
+    }
+
+    // Now 'removedArgs' contains only pointers that are valid.
+    if (removedArgs.pointerCount <= 0 || removedArgs.action == ACTION_UNKNOWN) {
+        return out;
+    }
+    out.push_back(removedArgs);
+    return out;
+}
+
+UnwantedInteractionBlocker::UnwantedInteractionBlocker(InputListenerInterface& listener)
+      : UnwantedInteractionBlocker(listener, isPalmRejectionEnabled()){};
+
+UnwantedInteractionBlocker::UnwantedInteractionBlocker(InputListenerInterface& listener,
+                                                       bool enablePalmRejection)
+      : mListener(listener), mEnablePalmRejection(enablePalmRejection) {}
+
+void UnwantedInteractionBlocker::notifyConfigurationChanged(
+        const NotifyConfigurationChangedArgs* args) {
+    mListener.notifyConfigurationChanged(args);
+}
+
+void UnwantedInteractionBlocker::notifyKey(const NotifyKeyArgs* args) {
+    mListener.notifyKey(args);
+}
+
+void UnwantedInteractionBlocker::notifyMotion(const NotifyMotionArgs* args) {
+    auto it = mPalmRejectors.find(args->deviceId);
+    const bool sendToPalmRejector = it != mPalmRejectors.end() && isFromTouchscreen(args->source);
+    if (!sendToPalmRejector) {
+        mListener.notifyMotion(args);
+        return;
+    }
+
+    const std::vector<NotifyMotionArgs> newMotions = it->second.processMotion(*args);
+    for (const NotifyMotionArgs& newArgs : newMotions) {
+        mListener.notifyMotion(&newArgs);
+    }
+}
+
+void UnwantedInteractionBlocker::notifySwitch(const NotifySwitchArgs* args) {
+    mListener.notifySwitch(args);
+}
+
+void UnwantedInteractionBlocker::notifySensor(const NotifySensorArgs* args) {
+    mListener.notifySensor(args);
+}
+
+void UnwantedInteractionBlocker::notifyVibratorState(const NotifyVibratorStateArgs* args) {
+    mListener.notifyVibratorState(args);
+}
+void UnwantedInteractionBlocker::notifyDeviceReset(const NotifyDeviceResetArgs* args) {
+    auto it = mPalmRejectors.find(args->deviceId);
+    if (it != mPalmRejectors.end()) {
+        AndroidPalmFilterDeviceInfo info = it->second.getPalmFilterDeviceInfo();
+        // Re-create the object instead of resetting it
+        mPalmRejectors.erase(it);
+        mPalmRejectors.emplace(args->deviceId, info);
+    }
+    mListener.notifyDeviceReset(args);
+}
+
+void UnwantedInteractionBlocker::notifyPointerCaptureChanged(
+        const NotifyPointerCaptureChangedArgs* args) {
+    mListener.notifyPointerCaptureChanged(args);
+}
+
+void UnwantedInteractionBlocker::notifyInputDevicesChanged(
+        const std::vector<InputDeviceInfo>& inputDevices) {
+    if (!mEnablePalmRejection) {
+        // Palm rejection is disabled. Don't create any palm rejector objects.
+        return;
+    }
+
+    // Let's see which of the existing devices didn't change, so that we can keep them
+    // and prevent event stream disruption
+    std::set<int32_t /*deviceId*/> devicesToKeep;
+    for (const InputDeviceInfo& device : inputDevices) {
+        std::optional<AndroidPalmFilterDeviceInfo> info = createPalmFilterDeviceInfo(device);
+        if (!info) {
+            continue;
+        }
+
+        auto [it, emplaced] = mPalmRejectors.try_emplace(device.getId(), *info);
+        if (!emplaced && *info != it->second.getPalmFilterDeviceInfo()) {
+            // Re-create the PalmRejector because the device info has changed.
+            mPalmRejectors.erase(it);
+            mPalmRejectors.emplace(device.getId(), *info);
+        }
+        devicesToKeep.insert(device.getId());
+    }
+    // Delete all devices that we don't need to keep
+    std::erase_if(mPalmRejectors, [&devicesToKeep](const auto& item) {
+        auto const& [deviceId, _] = item;
+        return devicesToKeep.find(deviceId) == devicesToKeep.end();
+    });
+}
+
+void UnwantedInteractionBlocker::dump(std::string& dump) {
+    dump += "UnwantedInteractionBlocker:\n";
+    dump += StringPrintf("  mEnablePalmRejection: %s\n", toString(mEnablePalmRejection));
+    dump += StringPrintf("  isPalmRejectionEnabled (flag value): %s\n",
+                         toString(isPalmRejectionEnabled()));
+    dump += mPalmRejectors.empty() ? "  mPalmRejectors: None\n" : "  mPalmRejectors:\n";
+    for (const auto& [deviceId, palmRejector] : mPalmRejectors) {
+        dump += StringPrintf("    deviceId = %" PRId32 ":\n", deviceId);
+        dump += addPrefix(palmRejector.dump(), "      ");
+    }
+}
+
+void UnwantedInteractionBlocker::monitor() {}
+
+UnwantedInteractionBlocker::~UnwantedInteractionBlocker() {}
+
+void SlotState::update(const NotifyMotionArgs& args) {
+    for (size_t i = 0; i < args.pointerCount; i++) {
+        const int32_t pointerId = args.pointerProperties[i].id;
+        const int32_t resolvedAction = resolveActionForPointer(i, args.action);
+        processPointerId(pointerId, resolvedAction);
+    }
+}
+
+size_t SlotState::findUnusedSlot() const {
+    size_t unusedSlot = 0;
+    // Since the collection is ordered, we can rely on the in-order traversal
+    for (const auto& [slot, trackingId] : mPointerIdsBySlot) {
+        if (unusedSlot != slot) {
+            break;
+        }
+        unusedSlot++;
+    }
+    return unusedSlot;
+}
+
+void SlotState::processPointerId(int pointerId, int32_t actionMasked) {
+    switch (MotionEvent::getActionMasked(actionMasked)) {
+        case AMOTION_EVENT_ACTION_DOWN:
+        case AMOTION_EVENT_ACTION_POINTER_DOWN:
+        case AMOTION_EVENT_ACTION_HOVER_ENTER: {
+            // New pointer going down
+            size_t newSlot = findUnusedSlot();
+            mPointerIdsBySlot[newSlot] = pointerId;
+            mSlotsByPointerId[pointerId] = newSlot;
+            return;
+        }
+        case AMOTION_EVENT_ACTION_MOVE:
+        case AMOTION_EVENT_ACTION_HOVER_MOVE: {
+            return;
+        }
+        case AMOTION_EVENT_ACTION_CANCEL:
+        case AMOTION_EVENT_ACTION_POINTER_UP:
+        case AMOTION_EVENT_ACTION_UP:
+        case AMOTION_EVENT_ACTION_HOVER_EXIT: {
+            auto it = mSlotsByPointerId.find(pointerId);
+            LOG_ALWAYS_FATAL_IF(it == mSlotsByPointerId.end());
+            size_t slot = it->second;
+            // Erase this pointer from both collections
+            mPointerIdsBySlot.erase(slot);
+            mSlotsByPointerId.erase(pointerId);
+            return;
+        }
+    }
+    LOG_ALWAYS_FATAL("Unhandled action : %s", MotionEvent::actionToString(actionMasked).c_str());
+    return;
+}
+
+std::optional<size_t> SlotState::getSlotForPointerId(int32_t pointerId) const {
+    auto it = mSlotsByPointerId.find(pointerId);
+    if (it == mSlotsByPointerId.end()) {
+        return std::nullopt;
+    }
+    return it->second;
+}
+
+std::string SlotState::dump() const {
+    std::string out = "mSlotsByPointerId:\n";
+    out += addPrefix(dumpMap(mSlotsByPointerId), "  ") + "\n";
+    out += "mPointerIdsBySlot:\n";
+    out += addPrefix(dumpMap(mPointerIdsBySlot), "  ") + "\n";
+    return out;
+}
+
+PalmRejector::PalmRejector(const AndroidPalmFilterDeviceInfo& info,
+                           std::unique_ptr<::ui::PalmDetectionFilter> filter)
+      : mSharedPalmState(std::make_unique<::ui::SharedPalmDetectionFilterState>()),
+        mDeviceInfo(info),
+        mPalmDetectionFilter(std::move(filter)) {
+    if (mPalmDetectionFilter != nullptr) {
+        // This path is used for testing. Non-testing invocations should let this constructor
+        // create a real PalmDetectionFilter
+        return;
+    }
+    std::unique_ptr<::ui::NeuralStylusPalmDetectionFilterModel> model =
+            std::make_unique<::ui::OneDeviceTrainNeuralStylusPalmDetectionFilterModel>(
+                    std::vector<float>());
+    mPalmDetectionFilter =
+            std::make_unique<::ui::NeuralStylusPalmDetectionFilter>(mDeviceInfo, std::move(model),
+                                                                    mSharedPalmState.get());
+}
+
+std::vector<::ui::InProgressTouchEvdev> getTouches(const NotifyMotionArgs& args,
+                                                   const AndroidPalmFilterDeviceInfo& deviceInfo,
+                                                   const SlotState& oldSlotState,
+                                                   const SlotState& newSlotState) {
+    std::vector<::ui::InProgressTouchEvdev> touches;
+
+    for (size_t i = 0; i < args.pointerCount; i++) {
+        const int32_t pointerId = args.pointerProperties[i].id;
+        touches.emplace_back(::ui::InProgressTouchEvdev());
+        touches.back().major = args.pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_TOUCH_MAJOR);
+        touches.back().minor = args.pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_TOUCH_MINOR);
+        touches.back().tool_type = getLinuxToolType(args.pointerProperties[i].toolType);
+
+        // Whether there is new information for the touch.
+        touches.back().altered = true;
+
+        // Whether the touch was cancelled. Touch events should be ignored till a
+        // new touch is initiated.
+        touches.back().was_cancelled = false;
+
+        // Whether the touch is going to be canceled.
+        touches.back().cancelled = false;
+
+        // Whether the touch is delayed at first appearance. Will not be reported yet.
+        touches.back().delayed = false;
+
+        // Whether the touch was delayed before.
+        touches.back().was_delayed = false;
+
+        // Whether the touch is held until end or no longer held.
+        touches.back().held = false;
+
+        // Whether this touch was held before being sent.
+        touches.back().was_held = false;
+
+        const int32_t resolvedAction = resolveActionForPointer(i, args.action);
+        const bool isDown = resolvedAction == AMOTION_EVENT_ACTION_POINTER_DOWN ||
+                resolvedAction == AMOTION_EVENT_ACTION_DOWN;
+        touches.back().was_touching = !isDown;
+
+        const bool isUpOrCancel = resolvedAction == AMOTION_EVENT_ACTION_CANCEL ||
+                resolvedAction == AMOTION_EVENT_ACTION_UP ||
+                resolvedAction == AMOTION_EVENT_ACTION_POINTER_UP;
+
+        touches.back().x = args.pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_X);
+        touches.back().y = args.pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_Y);
+
+        std::optional<size_t> slot = newSlotState.getSlotForPointerId(pointerId);
+        if (!slot) {
+            slot = oldSlotState.getSlotForPointerId(pointerId);
+        }
+        LOG_ALWAYS_FATAL_IF(!slot, "Could not find slot for pointer %d", pointerId);
+        touches.back().slot = *slot;
+        touches.back().tracking_id = (!isUpOrCancel) ? pointerId : -1;
+        touches.back().touching = !isUpOrCancel;
+
+        // The fields 'radius_x' and 'radius_x' are not used for palm rejection
+        touches.back().pressure = args.pointerCoords[i].getAxisValue(AMOTION_EVENT_AXIS_PRESSURE);
+        touches.back().tool_code = BTN_TOOL_FINGER;
+        // The field 'orientation' is not used for palm rejection
+        // The fields 'tilt_x' and 'tilt_y' are not used for palm rejection
+        touches.back().reported_tool_type = ::ui::EventPointerType::kTouch;
+        touches.back().stylus_button = false;
+    }
+    return touches;
+}
+
+std::vector<NotifyMotionArgs> PalmRejector::processMotion(const NotifyMotionArgs& args) {
+    if (mPalmDetectionFilter == nullptr) {
+        return {args};
+    }
+    const bool skipThisEvent = args.action == AMOTION_EVENT_ACTION_HOVER_ENTER ||
+            args.action == AMOTION_EVENT_ACTION_HOVER_MOVE ||
+            args.action == AMOTION_EVENT_ACTION_HOVER_EXIT ||
+            args.action == AMOTION_EVENT_ACTION_BUTTON_PRESS ||
+            args.action == AMOTION_EVENT_ACTION_BUTTON_RELEASE ||
+            args.action == AMOTION_EVENT_ACTION_SCROLL;
+    if (skipThisEvent) {
+        // Lets not process hover events, button events, or scroll for now.
+        return {args};
+    }
+    if (args.action == AMOTION_EVENT_ACTION_DOWN) {
+        mSuppressedPointerIds.clear();
+    }
+    std::bitset<::ui::kNumTouchEvdevSlots> slotsToHold;
+    std::bitset<::ui::kNumTouchEvdevSlots> slotsToSuppress;
+
+    // Store the slot state before we call getTouches and update it. This way, we can find
+    // the slots that have been removed due to the incoming event.
+    SlotState oldSlotState = mSlotState;
+    mSlotState.update(args);
+    std::vector<::ui::InProgressTouchEvdev> touches =
+            getTouches(args, mDeviceInfo, oldSlotState, mSlotState);
+    ::base::TimeTicks chromeTimestamp = toChromeTimestamp(args.eventTime);
+
+    mPalmDetectionFilter->Filter(touches, chromeTimestamp, &slotsToHold, &slotsToSuppress);
+
+    // Now that we know which slots should be suppressed, let's convert those to pointer id's.
+    std::set<int32_t> oldSuppressedIds;
+    std::swap(oldSuppressedIds, mSuppressedPointerIds);
+    for (size_t i = 0; i < args.pointerCount; i++) {
+        const int32_t pointerId = args.pointerProperties[i].id;
+        std::optional<size_t> slot = oldSlotState.getSlotForPointerId(pointerId);
+        if (!slot) {
+            slot = mSlotState.getSlotForPointerId(pointerId);
+            LOG_ALWAYS_FATAL_IF(!slot, "Could not find slot for pointer id %" PRId32, pointerId);
+        }
+        if (slotsToSuppress.test(*slot)) {
+            mSuppressedPointerIds.insert(pointerId);
+        }
+    }
+
+    std::vector<NotifyMotionArgs> argsWithoutUnwantedPointers =
+            cancelSuppressedPointers(args, oldSuppressedIds, mSuppressedPointerIds);
+    for (const NotifyMotionArgs& checkArgs : argsWithoutUnwantedPointers) {
+        LOG_ALWAYS_FATAL_IF(checkArgs.action == ACTION_UNKNOWN, "%s", checkArgs.dump().c_str());
+    }
+
+    if (mSuppressedPointerIds != oldSuppressedIds) {
+        if (argsWithoutUnwantedPointers.size() != 1 ||
+            argsWithoutUnwantedPointers[0].pointerCount != args.pointerCount) {
+            ALOGI("Palm detected, removing pointer ids %s from %s",
+                  dumpSet(mSuppressedPointerIds).c_str(), args.dump().c_str());
+        }
+    }
+
+    return argsWithoutUnwantedPointers;
+}
+
+const AndroidPalmFilterDeviceInfo& PalmRejector::getPalmFilterDeviceInfo() {
+    return mDeviceInfo;
+}
+
+std::string PalmRejector::dump() const {
+    std::string out;
+    out += "mDeviceInfo:\n";
+    out += addPrefix(dumpDeviceInfo(mDeviceInfo), "  ");
+    out += "mSlotState:\n";
+    out += addPrefix(mSlotState.dump(), "  ");
+    out += "mSuppressedPointerIds: ";
+    out += dumpSet(mSuppressedPointerIds) + "\n";
+    return out;
+}
+
+} // namespace android