Hold a weak reference to PointerController when handling vsync

am: 33c5903e77

Change-Id: If3e218dfdaa68953d184812884b7ed80ab16acfa

1 files changed, 25 insertions, 1 deletions

diff --git a/libs/input/PointerController.cpp b/libs/input/PointerController.cpp
index 27193b743379..abef66f9ecd9 100644
--- a/libs/input/PointerController.cpp
+++ b/libs/input/PointerController.cpp
@@ -36,6 +36,29 @@
 
 namespace android {
 
+// --- WeakLooperCallback ---
+
+class WeakLooperCallback: public LooperCallback {
+protected:
+    virtual ~WeakLooperCallback() { }
+
+public:
+    WeakLooperCallback(const wp<LooperCallback>& callback) :
+        mCallback(callback) {
+    }
+
+    virtual int handleEvent(int fd, int events, void* data) {
+        sp<LooperCallback> callback = mCallback.promote();
+        if (callback != NULL) {
+            return callback->handleEvent(fd, events, data);
+        }
+        return 0; // the client is gone, remove the callback
+    }
+
+private:
+    wp<LooperCallback> mCallback;
+};
+
 // --- PointerController ---
 
 // Time to wait before starting the fade when the pointer is inactive.
@@ -57,10 +80,11 @@ PointerController::PointerController(const sp<PointerControllerPolicyInterface>&
         const sp<Looper>& looper, const sp<SpriteController>& spriteController) :
         mPolicy(policy), mLooper(looper), mSpriteController(spriteController) {
     mHandler = new WeakMessageHandler(this);
+    mCallback = new WeakLooperCallback(this);
 
     if (mDisplayEventReceiver.initCheck() == NO_ERROR) {
         mLooper->addFd(mDisplayEventReceiver.getFd(), Looper::POLL_CALLBACK,
-                       Looper::EVENT_INPUT, this, nullptr);
+                       Looper::EVENT_INPUT, mCallback, nullptr);
     } else {
         ALOGE("Failed to initialize DisplayEventReceiver.");
     }