check config for showing a stylus pointer (frameworks/base part)

On InputReader, get the configuration from config.xml
to decide whether to show a stylus pointer.

Test: Manual Test(hover pointer on handwriting area)
Bug: b/215436642
Change-Id: Ia08052f97e027c48d3bbc76ad03988722a7d9e2f

services/core/java/com/android/server/input/InputManagerService.java

@@ -2974,6 +2974,13 @@ public class InputManagerService extends IInputManager.Stub
         return null;
     }
 
+    // Native callback.
+    @SuppressWarnings("unused")
+    private boolean isStylusPointerIconEnabled() {
+        return Objects.requireNonNull(mContext.getSystemService(InputManager.class))
+                .isStylusPointerIconEnabled();
+    }
+
     private static class PointerDisplayIdChangedArgs {
         final int mPointerDisplayId;
         final float mXPosition;

services/core/jni/com_android_server_input_InputManagerService.cpp

@@ -137,6 +137,7 @@ static struct {
     jmethodID notifyDropWindow;
     jmethodID getParentSurfaceForPointers;
     jmethodID isPerDisplayTouchModeEnabled;
+    jmethodID isStylusPointerIconEnabled;
 } gServiceClassInfo;
 
 static struct {
@@ -660,6 +661,12 @@ void NativeInputManager::getReaderConfiguration(InputReaderConfiguration* outCon
         outConfig->pointerGestureTapSlop = hoverTapSlop;
     }
 
+    jboolean stylusPointerIconEnabled =
+            env->CallBooleanMethod(mServiceObj, gServiceClassInfo.isStylusPointerIconEnabled);
+    if (!checkAndClearExceptionFromCallback(env, "isStylusPointerIconEnabled")) {
+        outConfig->stylusPointerIconEnabled = stylusPointerIconEnabled;
+    }
+
     { // acquire lock
         AutoMutex _l(mLock);
 
@@ -2793,6 +2800,9 @@ int register_android_server_InputManager(JNIEnv* env) {
     GET_METHOD_ID(gServiceClassInfo.isPerDisplayTouchModeEnabled, clazz,
                   "isPerDisplayTouchModeEnabled", "()Z");
 
+    GET_METHOD_ID(gServiceClassInfo.isStylusPointerIconEnabled, clazz, "isStylusPointerIconEnabled",
+                  "()Z");
+
     // InputDevice
 
     FIND_CLASS(gInputDeviceClassInfo.clazz, "android/view/InputDevice");