1 files changed, 59 insertions, 0 deletions
diff --git a/services/surfaceflinger/EventControlThread.cpp b/services/surfaceflinger/EventControlThread.cpp
new file mode 100644
index 0000000..6504091
--- /dev/null
+++ b/services/surfaceflinger/EventControlThread.cpp
@@ -0,0 +1,59 @@
+/*
+ * 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.
+ */
+
+#include "EventControlThread.h"
+#include "SurfaceFlinger.h"
+
+namespace android {
+
+EventControlThread::EventControlThread(const sp<SurfaceFlinger>& flinger):
+        mFlinger(flinger),
+        mVsyncEnabled(false) {
+}
+
+void EventControlThread::setVsyncEnabled(bool enabled) {
+    Mutex::Autolock lock(mMutex);
+    mVsyncEnabled = enabled;
+    mCond.signal();
+}
+
+bool EventControlThread::threadLoop() {
+    Mutex::Autolock lock(mMutex);
+
+    bool vsyncEnabled = mVsyncEnabled;
+
+    mFlinger->eventControl(HWC_DISPLAY_PRIMARY, SurfaceFlinger::EVENT_VSYNC,
+            mVsyncEnabled);
+
+    while (true) {
+        status_t err = mCond.wait(mMutex);
+        if (err != NO_ERROR) {
+            ALOGE("error waiting for new events: %s (%d)",
+                strerror(-err), err);
+            return false;
+        }
+
+        if (vsyncEnabled != mVsyncEnabled) {
+            mFlinger->eventControl(HWC_DISPLAY_PRIMARY,
+                    SurfaceFlinger::EVENT_VSYNC, mVsyncEnabled);
+            vsyncEnabled = mVsyncEnabled;
+        }
+    }
+
+    return false;
+}
+
+} // namespace android