Add support for sending VSYNC events to the framework

use gui/DisplayEvent to receive the events. Events are
dispatched through a unix pipe, so the API is compatible
with utils/Looper. see gui/DisplayEvent.h for more info.

Bug: 1475048
Change-Id: Ia720f64d1b950328b47b22c6a86042e481d35f09

1 files changed, 79 insertions, 0 deletions

diff --git a/services/surfaceflinger/EventThread.h b/services/surfaceflinger/EventThread.h
new file mode 100644
index 0000000..0482ab7
--- /dev/null
+++ b/services/surfaceflinger/EventThread.h
@@ -0,0 +1,79 @@
+/*
+ * Copyright (C) 2011 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 ANDROID_SURFACE_FLINGER_EVENT_THREAD_H
+#define ANDROID_SURFACE_FLINGER_EVENT_THREAD_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <gui/IDisplayEventConnection.h>
+
+#include <utils/Errors.h>
+#include <utils/threads.h>
+#include <utils/SortedVector.h>
+
+#include "DisplayEventConnection.h"
+
+// ---------------------------------------------------------------------------
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+class SurfaceFlinger;
+class DisplayHardware;
+
+// ---------------------------------------------------------------------------
+
+class EventThread : public Thread {
+    friend class DisplayEventConnection;
+
+public:
+    EventThread(const sp<SurfaceFlinger>& flinger);
+
+    status_t registerDisplayEventConnection(
+            const sp<DisplayEventConnection>& connection);
+
+    status_t unregisterDisplayEventConnection(
+            const wp<DisplayEventConnection>& connection);
+
+    void dump(String8& result, char* buffer, size_t SIZE) const;
+
+private:
+    virtual bool        threadLoop();
+    virtual status_t    readyToRun();
+    virtual void        onFirstRef();
+
+    // constants
+    sp<SurfaceFlinger> mFlinger;
+    const DisplayHardware& mHw;
+
+    mutable Mutex mLock;
+    mutable Condition mCondition;
+
+    // protected by mLock
+    SortedVector<wp<DisplayEventConnection> > mDisplayEventConnections;
+    size_t mDeliveredEvents;
+};
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android
+
+// ---------------------------------------------------------------------------
+
+#endif /* ANDROID_SURFACE_FLINGER_EVENT_THREAD_H */