SurfaceFlinger: Add EventControlThread
This change adds a new thread for calling HWComposer's eventControl
asynchronously. The DispSync-based vsync approach ends up enabling and
disabling HWComposer's vsync callbacks at arbitrary times, and some HWComposer
implementations do not have these calls optimized.
Bug: 11175503
Change-Id: I719be82bd200b391c61d40863b991c7b59acdfd6
diff --git a/services/surfaceflinger/EventControlThread.h b/services/surfaceflinger/EventControlThread.h
new file mode 100644
index 0000000..be6c53a
--- /dev/null
+++ b/services/surfaceflinger/EventControlThread.h
@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2013 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_EVENTCONTROLTHREAD_H
+#define ANDROID_EVENTCONTROLTHREAD_H
+
+#include <stddef.h>
+
+#include <utils/Mutex.h>
+#include <utils/Thread.h>
+
+namespace android {
+
+class SurfaceFlinger;
+
+class EventControlThread: public Thread {
+public:
+
+ EventControlThread(const sp<SurfaceFlinger>& flinger);
+ virtual ~EventControlThread() {}
+
+ void setVsyncEnabled(bool enabled);
+ virtual bool threadLoop();
+
+private:
+ sp<SurfaceFlinger> mFlinger;
+ bool mVsyncEnabled;
+
+ Mutex mMutex;
+ Condition mCond;
+};
+
+}
+
+#endif // ANDROID_DISPSYNC_H