Split InputFlinger into multiple libraries

This is the InputFlinger FE/BE split as detailed in
go/arc++inputflinger-split.

We split libinputflinger into the following dynamic libraries:
- libinputflinger: Acts as the frontend for inputflinger and implements
      InputDispatcher and InputManager.
- libinputreader: Acts as the backend for inputflinger and impliements
      InputReader and EventHub, and adds a InputReaderFactory to create
      the InputReader.
- libinputflinger_base: Contains the common logic that is shared
      throughout InputFlinger, and contains the definitions for
      InputReaderInterface (in InputReaderBase.h) and
      InputListenerInterface (in InputListener.h).

Bug: 119264687
Test: manual: Build, run, and test input (touch, mouse)
Change-Id: I8567635f48de58ee8e5bdb0f8a17a73ea6fa37ef

13 files changed, 582 insertions, 386 deletions

diff --git a/services/inputflinger/Android.bp b/services/inputflinger/Android.bp
index 7812cb2a61..4a8b6139ee 100644
--- a/services/inputflinger/Android.bp
+++ b/services/inputflinger/Android.bp
@@ -18,16 +18,59 @@ cc_library_shared {
     cpp_std: "c++17",
 
     srcs: [
-        "EventHub.cpp",
         "InputDispatcher.cpp",
-        "InputListener.cpp",
         "InputManager.cpp",
-        "InputReader.cpp",
     ],
 
     shared_libs: [
+        "libinputflinger_base",
+        "libinputreader",
         "libbase",
         "libbinder",
+        "libcutils",
+        "libinput",
+        "liblog",
+        "libutils",
+        "libui",
+    ],
+
+    cflags: [
+        "-Wall",
+        "-Wextra",
+        "-Werror",
+        "-Wno-unused-parameter",
+        // TODO: Move inputflinger to its own process and mark it hidden
+        //-fvisibility=hidden
+    ],
+
+    export_include_dirs: [
+        ".",
+        "include",
+    ],
+
+}
+
+
+cc_library_headers {
+   name: "libinputflinger_headers",
+
+   export_include_dirs: ["include"],
+}
+
+cc_library_shared {
+    name: "libinputreader",
+
+    cpp_std: "c++17",
+
+    srcs: [
+        "EventHub.cpp",
+        "InputReader.cpp",
+        "InputReaderFactory.cpp",
+    ],
+
+    shared_libs: [
+        "libinputflinger_base",
+        "libbase",
         "libcrypto",
         "libcutils",
         "libinput",
@@ -38,16 +81,53 @@ cc_library_shared {
         "libutils"
     ],
 
+    header_libs: [
+        "libinputflinger_headers",
+    ],
+
+    export_header_lib_headers: [
+        "libinputflinger_headers",
+    ],
+
     cflags: [
         "-Wall",
         "-Wextra",
         "-Werror",
         "-Wno-unused-parameter",
-        // TODO: Move inputflinger to its own process and mark it hidden
-        //-fvisibility=hidden
+    ],
+}
+
+cc_library_shared {
+    name: "libinputflinger_base",
+
+    cpp_std: "c++17",
+
+    srcs: [
+        "InputListener.cpp",
+        "InputReaderBase.cpp",
     ],
 
-    export_include_dirs: ["."],
+    shared_libs: [
+        "libbase",
+        "libinput",
+        "liblog",
+        "libutils",
+    ],
+
+    header_libs: [
+        "libinputflinger_headers",
+    ],
+
+    export_header_lib_headers: [
+        "libinputflinger_headers",
+    ],
+
+    cflags: [
+        "-Wall",
+        "-Wextra",
+        "-Werror",
+        "-Wno-unused-parameter",
+    ],
 }
 
 subdirs = [
diff --git a/services/inputflinger/InputManager.cpp b/services/inputflinger/InputManager.cpp
index 40ca6a7d6d..388423ca20 100644
--- a/services/inputflinger/InputManager.cpp
+++ b/services/inputflinger/InputManager.cpp
@@ -19,6 +19,7 @@
 //#define LOG_NDEBUG 0
 
 #include "InputManager.h"
+#include "InputReaderFactory.h"
 
 #include <log/log.h>
 #include <unordered_map>
@@ -26,19 +27,10 @@
 namespace android {
 
 InputManager::InputManager(
-        const sp<EventHubInterface>& eventHub,
         const sp<InputReaderPolicyInterface>& readerPolicy,
         const sp<InputDispatcherPolicyInterface>& dispatcherPolicy) {
     mDispatcher = new InputDispatcher(dispatcherPolicy);
-    mReader = new InputReader(eventHub, readerPolicy, mDispatcher);
-    initialize();
-}
-
-InputManager::InputManager(
-        const sp<InputReaderInterface>& reader,
-        const sp<InputDispatcherInterface>& dispatcher) :
-        mReader(reader),
-        mDispatcher(dispatcher) {
+    mReader = createInputReader(readerPolicy, mDispatcher);
     initialize();
 }
 
diff --git a/services/inputflinger/InputManager.h b/services/inputflinger/InputManager.h
index d0e4cb02be..1173fa165f 100644
--- a/services/inputflinger/InputManager.h
+++ b/services/inputflinger/InputManager.h
@@ -22,7 +22,7 @@
  */
 
 #include "EventHub.h"
-#include "InputReader.h"
+#include "InputReaderBase.h"
 #include "InputDispatcher.h"
 
 #include <input/Input.h>
@@ -80,15 +80,9 @@ protected:
 
 public:
     InputManager(
-            const sp<EventHubInterface>& eventHub,
             const sp<InputReaderPolicyInterface>& readerPolicy,
             const sp<InputDispatcherPolicyInterface>& dispatcherPolicy);
 
-    // (used for testing purposes)
-    InputManager(
-            const sp<InputReaderInterface>& reader,
-            const sp<InputDispatcherInterface>& dispatcher);
-
     virtual status_t start();
     virtual status_t stop();
 
diff --git a/services/inputflinger/InputReader.cpp b/services/inputflinger/InputReader.cpp
index e85e6efe5d..9dd14dc799 100644
--- a/services/inputflinger/InputReader.cpp
+++ b/services/inputflinger/InputReader.cpp
@@ -254,47 +254,6 @@ static void synthesizeButtonKeys(InputReaderContext* context, int32_t action,
 }
 
 
-// --- InputReaderConfiguration ---
-
-std::optional<DisplayViewport> InputReaderConfiguration::getDisplayViewport(
-        ViewportType viewportType, const std::string& uniqueDisplayId) const {
-    for (const DisplayViewport& currentViewport : mDisplays) {
-        if (currentViewport.type == viewportType) {
-            if (uniqueDisplayId.empty() ||
-                    (!uniqueDisplayId.empty() && uniqueDisplayId == currentViewport.uniqueId)) {
-                return std::make_optional(currentViewport);
-            }
-        }
-    }
-    return std::nullopt;
-}
-
-void InputReaderConfiguration::setDisplayViewports(const std::vector<DisplayViewport>& viewports) {
-    mDisplays = viewports;
-}
-
-void InputReaderConfiguration::dump(std::string& dump) const {
-    for (const DisplayViewport& viewport : mDisplays) {
-        dumpViewport(dump, viewport);
-    }
-}
-
-void InputReaderConfiguration::dumpViewport(std::string& dump, const DisplayViewport& viewport)
-        const {
-    dump += StringPrintf(INDENT4 "%s\n", viewport.toString().c_str());
-}
-
-
-// -- TouchAffineTransformation --
-void TouchAffineTransformation::applyTo(float& x, float& y) const {
-    float newX, newY;
-    newX = x * x_scale + y * x_ymix + x_offset;
-    newY = x * y_xmix + y * y_scale + y_offset;
-
-    x = newX;
-    y = newY;
-}
-
 
 // --- InputReader ---
 
@@ -987,21 +946,6 @@ EventHubInterface* InputReader::ContextImpl::getEventHub() {
 }
 
 
-// --- InputReaderThread ---
-
-InputReaderThread::InputReaderThread(const sp<InputReaderInterface>& reader) :
-        Thread(/*canCallJava*/ true), mReader(reader) {
-}
-
-InputReaderThread::~InputReaderThread() {
-}
-
-bool InputReaderThread::threadLoop() {
-    mReader->loopOnce();
-    return true;
-}
-
-
 // --- InputDevice ---
 
 InputDevice::InputDevice(InputReaderContext* context, int32_t id, int32_t generation,
diff --git a/services/inputflinger/InputReader.h b/services/inputflinger/InputReader.h
index 9b0007a2b8..1786fe8f26 100644
--- a/services/inputflinger/InputReader.h
+++ b/services/inputflinger/InputReader.h
@@ -20,6 +20,7 @@
 #include "EventHub.h"
 #include "PointerControllerInterface.h"
 #include "InputListener.h"
+#include "InputReaderBase.h"
 
 #include <input/DisplayViewport.h>
 #include <input/Input.h>
@@ -28,314 +29,20 @@
 #include <ui/DisplayInfo.h>
 #include <utils/KeyedVector.h>
 #include <utils/Condition.h>
-#include <utils/Thread.h>
 #include <utils/Mutex.h>
 #include <utils/Timers.h>
-#include <utils/RefBase.h>
 #include <utils/BitSet.h>
-#include <utils/SortedVector.h>
 
 #include <optional>
 #include <stddef.h>
 #include <unistd.h>
 #include <vector>
 
-// Maximum supported size of a vibration pattern.
-// Must be at least 2.
-#define MAX_VIBRATE_PATTERN_SIZE 100
-
-// Maximum allowable delay value in a vibration pattern before
-// which the delay will be truncated.
-#define MAX_VIBRATE_PATTERN_DELAY_NSECS (1000000 * 1000000000LL)
-
 namespace android {
 
 class InputDevice;
 class InputMapper;
 
-/*
- * Input reader configuration.
- *
- * Specifies various options that modify the behavior of the input reader.
- */
-struct InputReaderConfiguration {
-    // Describes changes that have occurred.
-    enum {
-        // The pointer speed changed.
-        CHANGE_POINTER_SPEED = 1 << 0,
-
-        // The pointer gesture control changed.
-        CHANGE_POINTER_GESTURE_ENABLEMENT = 1 << 1,
-
-        // The display size or orientation changed.
-        CHANGE_DISPLAY_INFO = 1 << 2,
-
-        // The visible touches option changed.
-        CHANGE_SHOW_TOUCHES = 1 << 3,
-
-        // The keyboard layouts must be reloaded.
-        CHANGE_KEYBOARD_LAYOUTS = 1 << 4,
-
-        // The device name alias supplied by the may have changed for some devices.
-        CHANGE_DEVICE_ALIAS = 1 << 5,
-
-        // The location calibration matrix changed.
-        CHANGE_TOUCH_AFFINE_TRANSFORMATION = 1 << 6,
-
-        // The presence of an external stylus has changed.
-        CHANGE_EXTERNAL_STYLUS_PRESENCE = 1 << 7,
-
-        // The pointer capture mode has changed.
-        CHANGE_POINTER_CAPTURE = 1 << 8,
-
-        // The set of disabled input devices (disabledDevices) has changed.
-        CHANGE_ENABLED_STATE = 1 << 9,
-
-        // All devices must be reopened.
-        CHANGE_MUST_REOPEN = 1 << 31,
-    };
-
-    // Gets the amount of time to disable virtual keys after the screen is touched
-    // in order to filter out accidental virtual key presses due to swiping gestures
-    // or taps near the edge of the display.  May be 0 to disable the feature.
-    nsecs_t virtualKeyQuietTime;
-
-    // The excluded device names for the platform.
-    // Devices with these names will be ignored.
-    std::vector<std::string> excludedDeviceNames;
-
-    // Velocity control parameters for mouse pointer movements.
-    VelocityControlParameters pointerVelocityControlParameters;
-
-    // Velocity control parameters for mouse wheel movements.
-    VelocityControlParameters wheelVelocityControlParameters;
-
-    // True if pointer gestures are enabled.
-    bool pointerGesturesEnabled;
-
-    // Quiet time between certain pointer gesture transitions.
-    // Time to allow for all fingers or buttons to settle into a stable state before
-    // starting a new gesture.
-    nsecs_t pointerGestureQuietInterval;
-
-    // The minimum speed that a pointer must travel for us to consider switching the active
-    // touch pointer to it during a drag.  This threshold is set to avoid switching due
-    // to noise from a finger resting on the touch pad (perhaps just pressing it down).
-    float pointerGestureDragMinSwitchSpeed; // in pixels per second
-
-    // Tap gesture delay time.
-    // The time between down and up must be less than this to be considered a tap.
-    nsecs_t pointerGestureTapInterval;
-
-    // Tap drag gesture delay time.
-    // The time between the previous tap's up and the next down must be less than
-    // this to be considered a drag.  Otherwise, the previous tap is finished and a
-    // new tap begins.
-    //
-    // Note that the previous tap will be held down for this entire duration so this
-    // interval must be shorter than the long press timeout.
-    nsecs_t pointerGestureTapDragInterval;
-
-    // The distance in pixels that the pointer is allowed to move from initial down
-    // to up and still be called a tap.
-    float pointerGestureTapSlop; // in pixels
-
-    // Time after the first touch points go down to settle on an initial centroid.
-    // This is intended to be enough time to handle cases where the user puts down two
-    // fingers at almost but not quite exactly the same time.
-    nsecs_t pointerGestureMultitouchSettleInterval;
-
-    // The transition from PRESS to SWIPE or FREEFORM gesture mode is made when
-    // at least two pointers have moved at least this far from their starting place.
-    float pointerGestureMultitouchMinDistance; // in pixels
-
-    // The transition from PRESS to SWIPE gesture mode can only occur when the
-    // cosine of the angle between the two vectors is greater than or equal to than this value
-    // which indicates that the vectors are oriented in the same direction.
-    // When the vectors are oriented in the exactly same direction, the cosine is 1.0.
-    // (In exactly opposite directions, the cosine is -1.0.)
-    float pointerGestureSwipeTransitionAngleCosine;
-
-    // The transition from PRESS to SWIPE gesture mode can only occur when the
-    // fingers are no more than this far apart relative to the diagonal size of
-    // the touch pad.  For example, a ratio of 0.5 means that the fingers must be
-    // no more than half the diagonal size of the touch pad apart.
-    float pointerGestureSwipeMaxWidthRatio;
-
-    // The gesture movement speed factor relative to the size of the display.
-    // Movement speed applies when the fingers are moving in the same direction.
-    // Without acceleration, a full swipe of the touch pad diagonal in movement mode
-    // will cover this portion of the display diagonal.
-    float pointerGestureMovementSpeedRatio;
-
-    // The gesture zoom speed factor relative to the size of the display.
-    // Zoom speed applies when the fingers are mostly moving relative to each other
-    // to execute a scale gesture or similar.
-    // Without acceleration, a full swipe of the touch pad diagonal in zoom mode
-    // will cover this portion of the display diagonal.
-    float pointerGestureZoomSpeedRatio;
-
-    // True to show the location of touches on the touch screen as spots.
-    bool showTouches;
-
-    // True if pointer capture is enabled.
-    bool pointerCapture;
-
-    // The set of currently disabled input devices.
-    SortedVector<int32_t> disabledDevices;
-
-    InputReaderConfiguration() :
-            virtualKeyQuietTime(0),
-            pointerVelocityControlParameters(1.0f, 500.0f, 3000.0f, 3.0f),
-            wheelVelocityControlParameters(1.0f, 15.0f, 50.0f, 4.0f),
-            pointerGesturesEnabled(true),
-            pointerGestureQuietInterval(100 * 1000000LL), // 100 ms
-            pointerGestureDragMinSwitchSpeed(50), // 50 pixels per second
-            pointerGestureTapInterval(150 * 1000000LL), // 150 ms
-            pointerGestureTapDragInterval(150 * 1000000LL), // 150 ms
-            pointerGestureTapSlop(10.0f), // 10 pixels
-            pointerGestureMultitouchSettleInterval(100 * 1000000LL), // 100 ms
-            pointerGestureMultitouchMinDistance(15), // 15 pixels
-            pointerGestureSwipeTransitionAngleCosine(0.2588f), // cosine of 75 degrees
-            pointerGestureSwipeMaxWidthRatio(0.25f),
-            pointerGestureMovementSpeedRatio(0.8f),
-            pointerGestureZoomSpeedRatio(0.3f),
-            showTouches(false) { }
-
-    std::optional<DisplayViewport> getDisplayViewport(ViewportType viewportType,
-            const std::string& uniqueDisplayId) const;
-    void setDisplayViewports(const std::vector<DisplayViewport>& viewports);
-
-
-    void dump(std::string& dump) const;
-    void dumpViewport(std::string& dump, const DisplayViewport& viewport) const;
-
-private:
-    std::vector<DisplayViewport> mDisplays;
-};
-
-
-struct TouchAffineTransformation {
-    float x_scale;
-    float x_ymix;
-    float x_offset;
-    float y_xmix;
-    float y_scale;
-    float y_offset;
-
-    TouchAffineTransformation() :
-        x_scale(1.0f), x_ymix(0.0f), x_offset(0.0f),
-        y_xmix(0.0f), y_scale(1.0f), y_offset(0.0f) {
-    }
-
-    TouchAffineTransformation(float xscale, float xymix, float xoffset,
-            float yxmix, float yscale, float yoffset) :
-        x_scale(xscale), x_ymix(xymix), x_offset(xoffset),
-        y_xmix(yxmix), y_scale(yscale), y_offset(yoffset) {
-    }
-
-    void applyTo(float& x, float& y) const;
-};
-
-
-/*
- * Input reader policy interface.
- *
- * The input reader policy is used by the input reader to interact with the Window Manager
- * and other system components.
- *
- * The actual implementation is partially supported by callbacks into the DVM
- * via JNI.  This interface is also mocked in the unit tests.
- *
- * These methods must NOT re-enter the input reader since they may be called while
- * holding the input reader lock.
- */
-class InputReaderPolicyInterface : public virtual RefBase {
-protected:
-    InputReaderPolicyInterface() { }
-    virtual ~InputReaderPolicyInterface() { }
-
-public:
-    /* Gets the input reader configuration. */
-    virtual void getReaderConfiguration(InputReaderConfiguration* outConfig) = 0;
-
-    /* Gets a pointer controller associated with the specified cursor device (ie. a mouse). */
-    virtual sp<PointerControllerInterface> obtainPointerController(int32_t deviceId) = 0;
-
-    /* Notifies the input reader policy that some input devices have changed
-     * and provides information about all current input devices.
-     */
-    virtual void notifyInputDevicesChanged(const Vector<InputDeviceInfo>& inputDevices) = 0;
-
-    /* Gets the keyboard layout for a particular input device. */
-    virtual sp<KeyCharacterMap> getKeyboardLayoutOverlay(
-            const InputDeviceIdentifier& identifier) = 0;
-
-    /* Gets a user-supplied alias for a particular input device, or an empty string if none. */
-    virtual std::string getDeviceAlias(const InputDeviceIdentifier& identifier) = 0;
-
-    /* Gets the affine calibration associated with the specified device. */
-    virtual TouchAffineTransformation getTouchAffineTransformation(
-            const std::string& inputDeviceDescriptor, int32_t surfaceRotation) = 0;
-};
-
-
-/* Processes raw input events and sends cooked event data to an input listener. */
-class InputReaderInterface : public virtual RefBase {
-protected:
-    InputReaderInterface() { }
-    virtual ~InputReaderInterface() { }
-
-public:
-    /* Dumps the state of the input reader.
-     *
-     * This method may be called on any thread (usually by the input manager). */
-    virtual void dump(std::string& dump) = 0;
-
-    /* Called by the heatbeat to ensures that the reader has not deadlocked. */
-    virtual void monitor() = 0;
-
-    /* Returns true if the input device is enabled. */
-    virtual bool isInputDeviceEnabled(int32_t deviceId) = 0;
-
-    /* Runs a single iteration of the processing loop.
-     * Nominally reads and processes one incoming message from the EventHub.
-     *
-     * This method should be called on the input reader thread.
-     */
-    virtual void loopOnce() = 0;
-
-    /* Gets information about all input devices.
-     *
-     * This method may be called on any thread (usually by the input manager).
-     */
-    virtual void getInputDevices(Vector<InputDeviceInfo>& outInputDevices) = 0;
-
-    /* Query current input state. */
-    virtual int32_t getScanCodeState(int32_t deviceId, uint32_t sourceMask,
-            int32_t scanCode) = 0;
-    virtual int32_t getKeyCodeState(int32_t deviceId, uint32_t sourceMask,
-            int32_t keyCode) = 0;
-    virtual int32_t getSwitchState(int32_t deviceId, uint32_t sourceMask,
-            int32_t sw) = 0;
-
-    /* Toggle Caps Lock */
-    virtual void toggleCapsLockState(int32_t deviceId) = 0;
-
-    /* Determine whether physical keys exist for the given framework-domain key codes. */
-    virtual bool hasKeys(int32_t deviceId, uint32_t sourceMask,
-            size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags) = 0;
-
-    /* Requests that a reconfiguration of all input devices.
-     * The changes flag is a bitfield that indicates what has changed and whether
-     * the input devices must all be reopened. */
-    virtual void requestRefreshConfiguration(uint32_t changes) = 0;
-
-    /* Controls the vibrator of a particular input device. */
-    virtual void vibrate(int32_t deviceId, const nsecs_t* pattern, size_t patternSize,
-            ssize_t repeat, int32_t token) = 0;
-    virtual void cancelVibrate(int32_t deviceId, int32_t token) = 0;
-};
 
 struct StylusState {
     /* Time the stylus event was received. */
@@ -527,19 +234,6 @@ private:
 };
 
 
-/* Reads raw events from the event hub and processes them, endlessly. */
-class InputReaderThread : public Thread {
-public:
-    explicit InputReaderThread(const sp<InputReaderInterface>& reader);
-    virtual ~InputReaderThread();
-
-private:
-    sp<InputReaderInterface> mReader;
-
-    virtual bool threadLoop();
-};
-
-
 /* Represents the state of a single input device. */
 class InputDevice {
 public:
diff --git a/services/inputflinger/InputReaderBase.cpp b/services/inputflinger/InputReaderBase.cpp
new file mode 100644
index 0000000000..17a116e822
--- /dev/null
+++ b/services/inputflinger/InputReaderBase.cpp
@@ -0,0 +1,91 @@
+/*
+ * Copyright (C) 2018 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 "InputReaderBase"
+
+//#define LOG_NDEBUG 0
+
+#include "InputReaderBase.h"
+
+#include <android/log.h>
+#include <android-base/stringprintf.h>
+
+#define INDENT "  "
+#define INDENT2 "    "
+#define INDENT3 "      "
+#define INDENT4 "        "
+#define INDENT5 "          "
+
+using android::base::StringPrintf;
+
+namespace android {
+
+// --- InputReaderThread ---
+
+InputReaderThread::InputReaderThread(const sp<InputReaderInterface>& reader) :
+        Thread(/*canCallJava*/ true), mReader(reader) {
+}
+
+InputReaderThread::~InputReaderThread() {
+}
+
+bool InputReaderThread::threadLoop() {
+    mReader->loopOnce();
+    return true;
+}
+
+// --- InputReaderConfiguration ---
+
+std::optional<DisplayViewport> InputReaderConfiguration::getDisplayViewport(
+        ViewportType viewportType, const std::string& uniqueDisplayId) const {
+    for (const DisplayViewport& currentViewport : mDisplays) {
+        if (currentViewport.type == viewportType) {
+            if (uniqueDisplayId.empty() ||
+                    (!uniqueDisplayId.empty() && uniqueDisplayId == currentViewport.uniqueId)) {
+                return std::make_optional(currentViewport);
+            }
+        }
+    }
+    return std::nullopt;
+}
+
+void InputReaderConfiguration::setDisplayViewports(const std::vector<DisplayViewport>& viewports) {
+    mDisplays = viewports;
+}
+
+void InputReaderConfiguration::dump(std::string& dump) const {
+    for (const DisplayViewport& viewport : mDisplays) {
+        dumpViewport(dump, viewport);
+    }
+}
+
+void InputReaderConfiguration::dumpViewport(std::string& dump, const DisplayViewport& viewport)
+        const {
+    dump += StringPrintf(INDENT4 "%s\n", viewport.toString().c_str());
+}
+
+
+// -- TouchAffineTransformation --
+void TouchAffineTransformation::applyTo(float& x, float& y) const {
+    float newX, newY;
+    newX = x * x_scale + y * x_ymix + x_offset;
+    newY = x * y_xmix + y * y_scale + y_offset;
+
+    x = newX;
+    y = newY;
+}
+
+} // namespace android
\ No newline at end of file
diff --git a/services/inputflinger/InputReaderFactory.cpp b/services/inputflinger/InputReaderFactory.cpp
new file mode 100644
index 0000000000..3534f6b760
--- /dev/null
+++ b/services/inputflinger/InputReaderFactory.cpp
@@ -0,0 +1,28 @@
+/*
+ * Copyright 2018 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.
+ */
+
+#include "InputReaderFactory.h"
+#include "InputReader.h"
+
+namespace android {
+
+sp<InputReaderInterface> createInputReader(
+        const sp<InputReaderPolicyInterface>& policy,
+        const sp<InputListenerInterface>& listener) {
+    return new InputReader(new EventHub(), policy, listener);
+}
+
+} // namespace android
\ No newline at end of file
diff --git a/services/inputflinger/EventHub.h b/services/inputflinger/include/EventHub.h
index e2c7e82f9f..e2c7e82f9f 100644
--- a/services/inputflinger/EventHub.h
+++ b/services/inputflinger/include/EventHub.h
diff --git a/services/inputflinger/InputListener.h b/services/inputflinger/include/InputListener.h
index a3d919bf5a..a3d919bf5a 100644
--- a/services/inputflinger/InputListener.h
+++ b/services/inputflinger/include/InputListener.h
diff --git a/services/inputflinger/include/InputReaderBase.h b/services/inputflinger/include/InputReaderBase.h
new file mode 100644
index 0000000000..fff8480f57
--- /dev/null
+++ b/services/inputflinger/include/InputReaderBase.h
@@ -0,0 +1,342 @@
+/*
+ * Copyright (C) 2018 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.
+ */
+
+#ifndef _UI_INPUT_READER_BASE_H
+#define _UI_INPUT_READER_BASE_H
+
+#include "PointerControllerInterface.h"
+
+#include <input/Input.h>
+#include <input/InputDevice.h>
+#include <input/DisplayViewport.h>
+#include <input/VelocityControl.h>
+#include <input/VelocityTracker.h>
+#include <utils/KeyedVector.h>
+#include <utils/Thread.h>
+#include <utils/RefBase.h>
+#include <utils/SortedVector.h>
+
+#include <optional>
+#include <stddef.h>
+#include <unistd.h>
+#include <vector>
+
+// Maximum supported size of a vibration pattern.
+// Must be at least 2.
+#define MAX_VIBRATE_PATTERN_SIZE 100
+
+// Maximum allowable delay value in a vibration pattern before
+// which the delay will be truncated.
+#define MAX_VIBRATE_PATTERN_DELAY_NSECS (1000000 * 1000000000LL)
+
+namespace android {
+
+/* Processes raw input events and sends cooked event data to an input listener. */
+class InputReaderInterface : public virtual RefBase {
+protected:
+    InputReaderInterface() { }
+    virtual ~InputReaderInterface() { }
+
+public:
+    /* Dumps the state of the input reader.
+     *
+     * This method may be called on any thread (usually by the input manager). */
+    virtual void dump(std::string& dump) = 0;
+
+    /* Called by the heatbeat to ensures that the reader has not deadlocked. */
+    virtual void monitor() = 0;
+
+    /* Returns true if the input device is enabled. */
+    virtual bool isInputDeviceEnabled(int32_t deviceId) = 0;
+
+    /* Runs a single iteration of the processing loop.
+     * Nominally reads and processes one incoming message from the EventHub.
+     *
+     * This method should be called on the input reader thread.
+     */
+    virtual void loopOnce() = 0;
+
+    /* Gets information about all input devices.
+     *
+     * This method may be called on any thread (usually by the input manager).
+     */
+    virtual void getInputDevices(Vector<InputDeviceInfo>& outInputDevices) = 0;
+
+    /* Query current input state. */
+    virtual int32_t getScanCodeState(int32_t deviceId, uint32_t sourceMask,
+            int32_t scanCode) = 0;
+    virtual int32_t getKeyCodeState(int32_t deviceId, uint32_t sourceMask,
+            int32_t keyCode) = 0;
+    virtual int32_t getSwitchState(int32_t deviceId, uint32_t sourceMask,
+            int32_t sw) = 0;
+
+    /* Toggle Caps Lock */
+    virtual void toggleCapsLockState(int32_t deviceId) = 0;
+
+    /* Determine whether physical keys exist for the given framework-domain key codes. */
+    virtual bool hasKeys(int32_t deviceId, uint32_t sourceMask,
+            size_t numCodes, const int32_t* keyCodes, uint8_t* outFlags) = 0;
+
+    /* Requests that a reconfiguration of all input devices.
+     * The changes flag is a bitfield that indicates what has changed and whether
+     * the input devices must all be reopened. */
+    virtual void requestRefreshConfiguration(uint32_t changes) = 0;
+
+    /* Controls the vibrator of a particular input device. */
+    virtual void vibrate(int32_t deviceId, const nsecs_t* pattern, size_t patternSize,
+            ssize_t repeat, int32_t token) = 0;
+    virtual void cancelVibrate(int32_t deviceId, int32_t token) = 0;
+};
+
+/* Reads raw events from the event hub and processes them, endlessly. */
+class InputReaderThread : public Thread {
+public:
+    explicit InputReaderThread(const sp<InputReaderInterface>& reader);
+    virtual ~InputReaderThread();
+
+private:
+    sp<InputReaderInterface> mReader;
+
+    virtual bool threadLoop();
+};
+
+/*
+ * Input reader configuration.
+ *
+ * Specifies various options that modify the behavior of the input reader.
+ */
+struct InputReaderConfiguration {
+    // Describes changes that have occurred.
+    enum {
+        // The pointer speed changed.
+        CHANGE_POINTER_SPEED = 1 << 0,
+
+        // The pointer gesture control changed.
+        CHANGE_POINTER_GESTURE_ENABLEMENT = 1 << 1,
+
+        // The display size or orientation changed.
+        CHANGE_DISPLAY_INFO = 1 << 2,
+
+        // The visible touches option changed.
+        CHANGE_SHOW_TOUCHES = 1 << 3,
+
+        // The keyboard layouts must be reloaded.
+        CHANGE_KEYBOARD_LAYOUTS = 1 << 4,
+
+        // The device name alias supplied by the may have changed for some devices.
+        CHANGE_DEVICE_ALIAS = 1 << 5,
+
+        // The location calibration matrix changed.
+        CHANGE_TOUCH_AFFINE_TRANSFORMATION = 1 << 6,
+
+        // The presence of an external stylus has changed.
+        CHANGE_EXTERNAL_STYLUS_PRESENCE = 1 << 7,
+
+        // The pointer capture mode has changed.
+        CHANGE_POINTER_CAPTURE = 1 << 8,
+
+        // The set of disabled input devices (disabledDevices) has changed.
+        CHANGE_ENABLED_STATE = 1 << 9,
+
+        // All devices must be reopened.
+        CHANGE_MUST_REOPEN = 1 << 31,
+    };
+
+    // Gets the amount of time to disable virtual keys after the screen is touched
+    // in order to filter out accidental virtual key presses due to swiping gestures
+    // or taps near the edge of the display.  May be 0 to disable the feature.
+    nsecs_t virtualKeyQuietTime;
+
+    // The excluded device names for the platform.
+    // Devices with these names will be ignored.
+    std::vector<std::string> excludedDeviceNames;
+
+    // Velocity control parameters for mouse pointer movements.
+    VelocityControlParameters pointerVelocityControlParameters;
+
+    // Velocity control parameters for mouse wheel movements.
+    VelocityControlParameters wheelVelocityControlParameters;
+
+    // True if pointer gestures are enabled.
+    bool pointerGesturesEnabled;
+
+    // Quiet time between certain pointer gesture transitions.
+    // Time to allow for all fingers or buttons to settle into a stable state before
+    // starting a new gesture.
+    nsecs_t pointerGestureQuietInterval;
+
+    // The minimum speed that a pointer must travel for us to consider switching the active
+    // touch pointer to it during a drag.  This threshold is set to avoid switching due
+    // to noise from a finger resting on the touch pad (perhaps just pressing it down).
+    float pointerGestureDragMinSwitchSpeed; // in pixels per second
+
+    // Tap gesture delay time.
+    // The time between down and up must be less than this to be considered a tap.
+    nsecs_t pointerGestureTapInterval;
+
+    // Tap drag gesture delay time.
+    // The time between the previous tap's up and the next down must be less than
+    // this to be considered a drag.  Otherwise, the previous tap is finished and a
+    // new tap begins.
+    //
+    // Note that the previous tap will be held down for this entire duration so this
+    // interval must be shorter than the long press timeout.
+    nsecs_t pointerGestureTapDragInterval;
+
+    // The distance in pixels that the pointer is allowed to move from initial down
+    // to up and still be called a tap.
+    float pointerGestureTapSlop; // in pixels
+
+    // Time after the first touch points go down to settle on an initial centroid.
+    // This is intended to be enough time to handle cases where the user puts down two
+    // fingers at almost but not quite exactly the same time.
+    nsecs_t pointerGestureMultitouchSettleInterval;
+
+    // The transition from PRESS to SWIPE or FREEFORM gesture mode is made when
+    // at least two pointers have moved at least this far from their starting place.
+    float pointerGestureMultitouchMinDistance; // in pixels
+
+    // The transition from PRESS to SWIPE gesture mode can only occur when the
+    // cosine of the angle between the two vectors is greater than or equal to than this value
+    // which indicates that the vectors are oriented in the same direction.
+    // When the vectors are oriented in the exactly same direction, the cosine is 1.0.
+    // (In exactly opposite directions, the cosine is -1.0.)
+    float pointerGestureSwipeTransitionAngleCosine;
+
+    // The transition from PRESS to SWIPE gesture mode can only occur when the
+    // fingers are no more than this far apart relative to the diagonal size of
+    // the touch pad.  For example, a ratio of 0.5 means that the fingers must be
+    // no more than half the diagonal size of the touch pad apart.
+    float pointerGestureSwipeMaxWidthRatio;
+
+    // The gesture movement speed factor relative to the size of the display.
+    // Movement speed applies when the fingers are moving in the same direction.
+    // Without acceleration, a full swipe of the touch pad diagonal in movement mode
+    // will cover this portion of the display diagonal.
+    float pointerGestureMovementSpeedRatio;
+
+    // The gesture zoom speed factor relative to the size of the display.
+    // Zoom speed applies when the fingers are mostly moving relative to each other
+    // to execute a scale gesture or similar.
+    // Without acceleration, a full swipe of the touch pad diagonal in zoom mode
+    // will cover this portion of the display diagonal.
+    float pointerGestureZoomSpeedRatio;
+
+    // True to show the location of touches on the touch screen as spots.
+    bool showTouches;
+
+    // True if pointer capture is enabled.
+    bool pointerCapture;
+
+    // The set of currently disabled input devices.
+    SortedVector<int32_t> disabledDevices;
+
+    InputReaderConfiguration() :
+            virtualKeyQuietTime(0),
+            pointerVelocityControlParameters(1.0f, 500.0f, 3000.0f, 3.0f),
+            wheelVelocityControlParameters(1.0f, 15.0f, 50.0f, 4.0f),
+            pointerGesturesEnabled(true),
+            pointerGestureQuietInterval(100 * 1000000LL), // 100 ms
+            pointerGestureDragMinSwitchSpeed(50), // 50 pixels per second
+            pointerGestureTapInterval(150 * 1000000LL), // 150 ms
+            pointerGestureTapDragInterval(150 * 1000000LL), // 150 ms
+            pointerGestureTapSlop(10.0f), // 10 pixels
+            pointerGestureMultitouchSettleInterval(100 * 1000000LL), // 100 ms
+            pointerGestureMultitouchMinDistance(15), // 15 pixels
+            pointerGestureSwipeTransitionAngleCosine(0.2588f), // cosine of 75 degrees
+            pointerGestureSwipeMaxWidthRatio(0.25f),
+            pointerGestureMovementSpeedRatio(0.8f),
+            pointerGestureZoomSpeedRatio(0.3f),
+            showTouches(false) { }
+
+    std::optional<DisplayViewport> getDisplayViewport(ViewportType viewportType,
+            const std::string& uniqueDisplayId) const;
+    void setDisplayViewports(const std::vector<DisplayViewport>& viewports);
+
+
+    void dump(std::string& dump) const;
+    void dumpViewport(std::string& dump, const DisplayViewport& viewport) const;
+
+private:
+    std::vector<DisplayViewport> mDisplays;
+};
+
+struct TouchAffineTransformation {
+    float x_scale;
+    float x_ymix;
+    float x_offset;
+    float y_xmix;
+    float y_scale;
+    float y_offset;
+
+    TouchAffineTransformation() :
+        x_scale(1.0f), x_ymix(0.0f), x_offset(0.0f),
+        y_xmix(0.0f), y_scale(1.0f), y_offset(0.0f) {
+    }
+
+    TouchAffineTransformation(float xscale, float xymix, float xoffset,
+            float yxmix, float yscale, float yoffset) :
+        x_scale(xscale), x_ymix(xymix), x_offset(xoffset),
+        y_xmix(yxmix), y_scale(yscale), y_offset(yoffset) {
+    }
+
+    void applyTo(float& x, float& y) const;
+};
+
+/*
+ * Input reader policy interface.
+ *
+ * The input reader policy is used by the input reader to interact with the Window Manager
+ * and other system components.
+ *
+ * The actual implementation is partially supported by callbacks into the DVM
+ * via JNI.  This interface is also mocked in the unit tests.
+ *
+ * These methods must NOT re-enter the input reader since they may be called while
+ * holding the input reader lock.
+ */
+class InputReaderPolicyInterface : public virtual RefBase {
+protected:
+    InputReaderPolicyInterface() { }
+    virtual ~InputReaderPolicyInterface() { }
+
+public:
+    /* Gets the input reader configuration. */
+    virtual void getReaderConfiguration(InputReaderConfiguration* outConfig) = 0;
+
+    /* Gets a pointer controller associated with the specified cursor device (ie. a mouse). */
+    virtual sp<PointerControllerInterface> obtainPointerController(int32_t deviceId) = 0;
+
+    /* Notifies the input reader policy that some input devices have changed
+     * and provides information about all current input devices.
+     */
+    virtual void notifyInputDevicesChanged(const Vector<InputDeviceInfo>& inputDevices) = 0;
+
+    /* Gets the keyboard layout for a particular input device. */
+    virtual sp<KeyCharacterMap> getKeyboardLayoutOverlay(
+            const InputDeviceIdentifier& identifier) = 0;
+
+    /* Gets a user-supplied alias for a particular input device, or an empty string if none. */
+    virtual std::string getDeviceAlias(const InputDeviceIdentifier& identifier) = 0;
+
+    /* Gets the affine calibration associated with the specified device. */
+    virtual TouchAffineTransformation getTouchAffineTransformation(
+            const std::string& inputDeviceDescriptor, int32_t surfaceRotation) = 0;
+};
+
+} // namespace android
+
+#endif // _UI_INPUT_READER_COMMON_H
\ No newline at end of file
diff --git a/services/inputflinger/include/InputReaderFactory.h b/services/inputflinger/include/InputReaderFactory.h
new file mode 100644
index 0000000000..9db6233d28
--- /dev/null
+++ b/services/inputflinger/include/InputReaderFactory.h
@@ -0,0 +1,29 @@
+/*
+ * Copyright 2018 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.
+ */
+
+#include <utils/StrongPointer.h>
+
+namespace android {
+
+class InputReaderInterface;
+class InputReaderPolicyInterface;
+class InputListenerInterface;
+
+sp<InputReaderInterface> createInputReader(
+        const sp<InputReaderPolicyInterface>& policy,
+        const sp<InputListenerInterface>& listener);
+
+} // namespace android
diff --git a/services/inputflinger/PointerControllerInterface.h b/services/inputflinger/include/PointerControllerInterface.h
index e94dd94868..e94dd94868 100644
--- a/services/inputflinger/PointerControllerInterface.h
+++ b/services/inputflinger/include/PointerControllerInterface.h
diff --git a/services/inputflinger/tests/Android.bp b/services/inputflinger/tests/Android.bp
index ea42855437..389a57c7f3 100644
--- a/services/inputflinger/tests/Android.bp
+++ b/services/inputflinger/tests/Android.bp
@@ -24,6 +24,8 @@ cc_test {
         "libui",
         "libinput",
         "libinputflinger",
+        "libinputreader",
+        "libinputflinger_base",
         "libinputservice",
     ],
 }