Move methods from TouchCursorInputMapperCommon.h into a cpp file

These methods are currently all used by two other files, but I want to
use one of them in TouchpadInputMapper.cpp. This means that I get
compilation errors saying the others are unused. Moving the method
definitions into a cpp file fixes this.

Bug: b/251196347
Test: builds without errors
Change-Id: Idc8b7bf2c8a1cb202e3122bcf5ff8552abbc9ca5
diff --git a/services/inputflinger/reader/Android.bp b/services/inputflinger/reader/Android.bp
index c93443a..a34cb4c 100644
--- a/services/inputflinger/reader/Android.bp
+++ b/services/inputflinger/reader/Android.bp
@@ -50,6 +50,7 @@
         "mapper/SensorInputMapper.cpp",
         "mapper/SingleTouchInputMapper.cpp",
         "mapper/SwitchInputMapper.cpp",
+        "mapper/TouchCursorInputMapperCommon.cpp",
         "mapper/TouchInputMapper.cpp",
         "mapper/TouchpadInputMapper.cpp",
         "mapper/VibratorInputMapper.cpp",
diff --git a/services/inputflinger/reader/mapper/TouchCursorInputMapperCommon.cpp b/services/inputflinger/reader/mapper/TouchCursorInputMapperCommon.cpp
new file mode 100644
index 0000000..c12e95d
--- /dev/null
+++ b/services/inputflinger/reader/mapper/TouchCursorInputMapperCommon.cpp
@@ -0,0 +1,127 @@
+/*
+ * 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.
+ */
+
+#include <input/DisplayViewport.h>
+#include <stdint.h>
+#include <ui/Rotation.h>
+
+#include "EventHub.h"
+#include "InputListener.h"
+#include "InputReaderContext.h"
+
+namespace android {
+
+namespace {
+
+[[nodiscard]] std::list<NotifyArgs> synthesizeButtonKey(
+        InputReaderContext* context, int32_t action, nsecs_t when, nsecs_t readTime,
+        int32_t deviceId, uint32_t source, int32_t displayId, uint32_t policyFlags,
+        int32_t lastButtonState, int32_t currentButtonState, int32_t buttonState, int32_t keyCode) {
+    std::list<NotifyArgs> out;
+    if ((action == AKEY_EVENT_ACTION_DOWN && !(lastButtonState & buttonState) &&
+         (currentButtonState & buttonState)) ||
+        (action == AKEY_EVENT_ACTION_UP && (lastButtonState & buttonState) &&
+         !(currentButtonState & buttonState))) {
+        out.push_back(NotifyKeyArgs(context->getNextId(), when, readTime, deviceId, source,
+                                    displayId, policyFlags, action, 0, keyCode, 0,
+                                    context->getGlobalMetaState(), when));
+    }
+    return out;
+}
+
+} // namespace
+
+ui::Rotation getInverseRotation(ui::Rotation orientation) {
+    switch (orientation) {
+        case ui::ROTATION_90:
+            return ui::ROTATION_270;
+        case ui::ROTATION_270:
+            return ui::ROTATION_90;
+        default:
+            return orientation;
+    }
+}
+
+void rotateDelta(ui::Rotation orientation, float* deltaX, float* deltaY) {
+    float temp;
+    switch (orientation) {
+        case ui::ROTATION_90:
+            temp = *deltaX;
+            *deltaX = *deltaY;
+            *deltaY = -temp;
+            break;
+
+        case ui::ROTATION_180:
+            *deltaX = -*deltaX;
+            *deltaY = -*deltaY;
+            break;
+
+        case ui::ROTATION_270:
+            temp = *deltaX;
+            *deltaX = -*deltaY;
+            *deltaY = temp;
+            break;
+
+        default:
+            break;
+    }
+}
+
+bool isPointerDown(int32_t buttonState) {
+    return buttonState &
+            (AMOTION_EVENT_BUTTON_PRIMARY | AMOTION_EVENT_BUTTON_SECONDARY |
+             AMOTION_EVENT_BUTTON_TERTIARY);
+}
+
+[[nodiscard]] std::list<NotifyArgs> synthesizeButtonKeys(
+        InputReaderContext* context, int32_t action, nsecs_t when, nsecs_t readTime,
+        int32_t deviceId, uint32_t source, int32_t displayId, uint32_t policyFlags,
+        int32_t lastButtonState, int32_t currentButtonState) {
+    std::list<NotifyArgs> out;
+    out += synthesizeButtonKey(context, action, when, readTime, deviceId, source, displayId,
+                               policyFlags, lastButtonState, currentButtonState,
+                               AMOTION_EVENT_BUTTON_BACK, AKEYCODE_BACK);
+    out += synthesizeButtonKey(context, action, when, readTime, deviceId, source, displayId,
+                               policyFlags, lastButtonState, currentButtonState,
+                               AMOTION_EVENT_BUTTON_FORWARD, AKEYCODE_FORWARD);
+    return out;
+}
+
+std::tuple<nsecs_t /*eventTime*/, nsecs_t /*readTime*/> applyBluetoothTimestampSmoothening(
+        const InputDeviceIdentifier& identifier, nsecs_t currentEventTime, nsecs_t readTime,
+        nsecs_t lastEventTime) {
+    if (identifier.bus != BUS_BLUETOOTH) {
+        return {currentEventTime, readTime};
+    }
+
+    // Assume the fastest rate at which a Bluetooth touch device can report input events is one
+    // every 4 milliseconds, or 250 Hz. Timestamps for successive events from a Bluetooth device
+    // will be separated by at least this amount.
+    constexpr static nsecs_t MIN_BLUETOOTH_TIMESTAMP_DELTA = ms2ns(4);
+    // We define a maximum smoothing time delta so that we don't generate events too far into the
+    // future.
+    constexpr static nsecs_t MAX_BLUETOOTH_SMOOTHING_DELTA = ms2ns(32);
+    const nsecs_t smoothenedEventTime =
+            std::min(std::max(currentEventTime, lastEventTime + MIN_BLUETOOTH_TIMESTAMP_DELTA),
+                     currentEventTime + MAX_BLUETOOTH_SMOOTHING_DELTA);
+    // If we are modifying the event time, treat this event as a synthetically generated event for
+    // latency tracking purposes and use the event time as the read time (zero read latency).
+    const nsecs_t smoothenedReadTime =
+            smoothenedEventTime != currentEventTime ? currentEventTime : readTime;
+    return {smoothenedEventTime, smoothenedReadTime};
+}
+
+} // namespace android
diff --git a/services/inputflinger/reader/mapper/TouchCursorInputMapperCommon.h b/services/inputflinger/reader/mapper/TouchCursorInputMapperCommon.h
index 1c3ca97..3023e68 100644
--- a/services/inputflinger/reader/mapper/TouchCursorInputMapperCommon.h
+++ b/services/inputflinger/reader/mapper/TouchCursorInputMapperCommon.h
@@ -26,81 +26,18 @@
 
 namespace android {
 
-// --- Static Definitions ---
+ui::Rotation getInverseRotation(ui::Rotation orientation);
 
-static ui::Rotation getInverseRotation(ui::Rotation orientation) {
-    switch (orientation) {
-        case ui::ROTATION_90:
-            return ui::ROTATION_270;
-        case ui::ROTATION_270:
-            return ui::ROTATION_90;
-        default:
-            return orientation;
-    }
-}
-
-static void rotateDelta(ui::Rotation orientation, float* deltaX, float* deltaY) {
-    float temp;
-    switch (orientation) {
-        case ui::ROTATION_90:
-            temp = *deltaX;
-            *deltaX = *deltaY;
-            *deltaY = -temp;
-            break;
-
-        case ui::ROTATION_180:
-            *deltaX = -*deltaX;
-            *deltaY = -*deltaY;
-            break;
-
-        case ui::ROTATION_270:
-            temp = *deltaX;
-            *deltaX = -*deltaY;
-            *deltaY = temp;
-            break;
-
-        default:
-            break;
-    }
-}
+void rotateDelta(ui::Rotation orientation, float* deltaX, float* deltaY);
 
 // Returns true if the pointer should be reported as being down given the specified
 // button states.  This determines whether the event is reported as a touch event.
-static bool isPointerDown(int32_t buttonState) {
-    return buttonState &
-            (AMOTION_EVENT_BUTTON_PRIMARY | AMOTION_EVENT_BUTTON_SECONDARY |
-             AMOTION_EVENT_BUTTON_TERTIARY);
-}
+bool isPointerDown(int32_t buttonState);
 
-[[nodiscard]] static std::list<NotifyArgs> synthesizeButtonKey(
+[[nodiscard]] std::list<NotifyArgs> synthesizeButtonKeys(
         InputReaderContext* context, int32_t action, nsecs_t when, nsecs_t readTime,
         int32_t deviceId, uint32_t source, int32_t displayId, uint32_t policyFlags,
-        int32_t lastButtonState, int32_t currentButtonState, int32_t buttonState, int32_t keyCode) {
-    std::list<NotifyArgs> out;
-    if ((action == AKEY_EVENT_ACTION_DOWN && !(lastButtonState & buttonState) &&
-         (currentButtonState & buttonState)) ||
-        (action == AKEY_EVENT_ACTION_UP && (lastButtonState & buttonState) &&
-         !(currentButtonState & buttonState))) {
-        out.push_back(NotifyKeyArgs(context->getNextId(), when, readTime, deviceId, source,
-                                    displayId, policyFlags, action, 0, keyCode, 0,
-                                    context->getGlobalMetaState(), when));
-    }
-    return out;
-}
-
-[[nodiscard]] static std::list<NotifyArgs> synthesizeButtonKeys(
-        InputReaderContext* context, int32_t action, nsecs_t when, nsecs_t readTime,
-        int32_t deviceId, uint32_t source, int32_t displayId, uint32_t policyFlags,
-        int32_t lastButtonState, int32_t currentButtonState) {
-    std::list<NotifyArgs> out;
-    out += synthesizeButtonKey(context, action, when, readTime, deviceId, source, displayId,
-                               policyFlags, lastButtonState, currentButtonState,
-                               AMOTION_EVENT_BUTTON_BACK, AKEYCODE_BACK);
-    out += synthesizeButtonKey(context, action, when, readTime, deviceId, source, displayId,
-                               policyFlags, lastButtonState, currentButtonState,
-                               AMOTION_EVENT_BUTTON_FORWARD, AKEYCODE_FORWARD);
-    return out;
-}
+        int32_t lastButtonState, int32_t currentButtonState);
 
 // For devices connected over Bluetooth, although they may produce events at a consistent rate,
 // the events might end up reaching Android in a "batched" manner through the Bluetooth
@@ -111,28 +48,8 @@
 // coordinates result in extremely large instantaneous velocities, which can negatively impact
 // user experience. To avoid this, we augment the timestamps so that subsequent event timestamps
 // differ by at least a minimum delta value.
-static std::tuple<nsecs_t /*eventTime*/, nsecs_t /*readTime*/> applyBluetoothTimestampSmoothening(
+std::tuple<nsecs_t /*eventTime*/, nsecs_t /*readTime*/> applyBluetoothTimestampSmoothening(
         const InputDeviceIdentifier& identifier, nsecs_t currentEventTime, nsecs_t readTime,
-        nsecs_t lastEventTime) {
-    if (identifier.bus != BUS_BLUETOOTH) {
-        return {currentEventTime, readTime};
-    }
-
-    // Assume the fastest rate at which a Bluetooth touch device can report input events is one
-    // every 4 milliseconds, or 250 Hz. Timestamps for successive events from a Bluetooth device
-    // will be separated by at least this amount.
-    constexpr static nsecs_t MIN_BLUETOOTH_TIMESTAMP_DELTA = ms2ns(4);
-    // We define a maximum smoothing time delta so that we don't generate events too far into the
-    // future.
-    constexpr static nsecs_t MAX_BLUETOOTH_SMOOTHING_DELTA = ms2ns(32);
-    const nsecs_t smoothenedEventTime =
-            std::min(std::max(currentEventTime, lastEventTime + MIN_BLUETOOTH_TIMESTAMP_DELTA),
-                     currentEventTime + MAX_BLUETOOTH_SMOOTHING_DELTA);
-    // If we are modifying the event time, treat this event as a synthetically generated event for
-    // latency tracking purposes and use the event time as the read time (zero read latency).
-    const nsecs_t smoothenedReadTime =
-            smoothenedEventTime != currentEventTime ? currentEventTime : readTime;
-    return {smoothenedEventTime, smoothenedReadTime};
-}
+        nsecs_t lastEventTime);
 
 } // namespace android