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
diff --git a/services/surfaceflinger/DisplayEventConnection.cpp b/services/surfaceflinger/DisplayEventConnection.cpp
new file mode 100644
index 0000000..a0aa9c0
--- /dev/null
+++ b/services/surfaceflinger/DisplayEventConnection.cpp
@@ -0,0 +1,62 @@
+/*
+ * 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.
+ */
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <gui/IDisplayEventConnection.h>
+#include <gui/BitTube.h>
+#include <gui/DisplayEventReceiver.h>
+
+#include <utils/Errors.h>
+
+#include "SurfaceFlinger.h"
+#include "DisplayEventConnection.h"
+
+// ---------------------------------------------------------------------------
+
+namespace android {
+
+// ---------------------------------------------------------------------------
+
+DisplayEventConnection::DisplayEventConnection(
+ const sp<SurfaceFlinger>& flinger)
+ : mFlinger(flinger), mChannel(new BitTube())
+{
+}
+
+DisplayEventConnection::~DisplayEventConnection() {
+ mFlinger->cleanupDisplayEventConnection(this);
+}
+
+void DisplayEventConnection::onFirstRef() {
+ // nothing to do here for now.
+}
+
+sp<BitTube> DisplayEventConnection::getDataChannel() const {
+ return mChannel;
+}
+
+status_t DisplayEventConnection::postEvent(const DisplayEventReceiver::Event& event)
+{
+ ssize_t size = mChannel->write(&event, sizeof(DisplayEventReceiver::Event));
+ return size < 0 ? status_t(size) : status_t(NO_ERROR);
+}
+
+
+// ---------------------------------------------------------------------------
+
+}; // namespace android