Add support for throttling motion events.

Change-Id: I24b3a17753e91ecda60a60fe5cd2e6b3260e033d

services/java/com/android/server/InputManager.java

@@ -26,6 +26,7 @@ import android.content.res.Configuration;
 import android.os.Environment;
 import android.os.LocalPowerManager;
 import android.os.PowerManager;
+import android.os.SystemProperties;
 import android.util.Slog;
 import android.util.Xml;
 import android.view.InputChannel;
@@ -507,5 +508,18 @@ public class InputManager {
             
             return names.toArray(new String[names.size()]);
         }
+        
+        @SuppressWarnings("unused")
+        public int getMaxEventsPerSecond() {
+            int result = 0;
+            try {
+                result = Integer.parseInt(SystemProperties.get("windowsmgr.max_events_per_sec"));
+            } catch (NumberFormatException e) {
+            }
+            if (result < 1) {
+                result = 35;
+            }
+            return result;
+        }
     }
 }

services/jni/com_android_server_InputManager.cpp

@@ -139,6 +139,7 @@ static struct {
     jmethodID filterJumpyTouchEvents;
     jmethodID getVirtualKeyDefinitions;
     jmethodID getExcludedDeviceNames;
+    jmethodID getMaxEventsPerSecond;
 } gCallbacksClassInfo;
 
 static struct {
@@ -249,6 +250,7 @@ public:
             int32_t injectorPid, int32_t injectorUid, Vector<InputTarget>& outTargets);
     virtual int32_t waitForMotionEventTargets(MotionEvent* motionEvent, uint32_t policyFlags,
             int32_t injectorPid, int32_t injectorUid, Vector<InputTarget>& outTargets);
+    virtual int32_t getMaxEventsPerSecond();
 
 private:
     struct InputWindow {
@@ -310,6 +312,9 @@ private:
     int32_t mFilterTouchEvents;
     int32_t mFilterJumpyTouchEvents;
 
+    // Cached throttling policy.
+    int32_t mMaxEventsPerSecond;
+
     // Cached display state.  (lock mDisplayLock)
     Mutex mDisplayLock;
     int32_t mDisplayWidth, mDisplayHeight;
@@ -400,6 +405,7 @@ private:
 
 NativeInputManager::NativeInputManager(jobject callbacksObj) :
     mFilterTouchEvents(-1), mFilterJumpyTouchEvents(-1),
+    mMaxEventsPerSecond(-1),
     mDisplayWidth(-1), mDisplayHeight(-1), mDisplayOrientation(ROTATION_0),
     mDispatchEnabled(true), mDispatchFrozen(false), mWindowsReady(true),
     mFocusedWindow(NULL), mTouchDown(false), mTouchedWindow(NULL),
@@ -921,6 +927,21 @@ nsecs_t NativeInputManager::getKeyRepeatTimeout() {
     }
 }
 
+int32_t NativeInputManager::getMaxEventsPerSecond() {
+    if (mMaxEventsPerSecond < 0) {
+        JNIEnv* env = jniEnv();
+
+        jint result = env->CallIntMethod(mCallbacksObj,
+                gCallbacksClassInfo.getMaxEventsPerSecond);
+        if (checkAndClearExceptionFromCallback(env, "getMaxEventsPerSecond")) {
+            result = 35;
+        }
+
+        mMaxEventsPerSecond = result;
+    }
+    return mMaxEventsPerSecond;
+}
+
 void NativeInputManager::setInputWindows(JNIEnv* env, jobjectArray windowObjArray) {
 #if DEBUG_FOCUS
     LOGD("setInputWindows");
@@ -2293,6 +2314,9 @@ int register_android_server_InputManager(JNIEnv* env) {
     GET_METHOD_ID(gCallbacksClassInfo.getExcludedDeviceNames, gCallbacksClassInfo.clazz,
             "getExcludedDeviceNames", "()[Ljava/lang/String;");
 
+    GET_METHOD_ID(gCallbacksClassInfo.getMaxEventsPerSecond, gCallbacksClassInfo.clazz,
+            "getMaxEventsPerSecond", "()I");
+
     // VirtualKeyDefinition
 
     FIND_CLASS(gVirtualKeyDefinitionClassInfo.clazz,