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/tests/vsync/vsync.cpp b/services/surfaceflinger/tests/vsync/vsync.cpp
new file mode 100644
index 0000000..4f79080
--- /dev/null
+++ b/services/surfaceflinger/tests/vsync/vsync.cpp
@@ -0,0 +1,81 @@
+/*
+ * Copyright (C) 2010 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 <gui/DisplayEventReceiver.h>
+#include <utils/Looper.h>
+
+using namespace android;
+
+int receiver(int fd, int events, void* data)
+{
+ DisplayEventReceiver* q = (DisplayEventReceiver*)data;
+
+ ssize_t n;
+ DisplayEventReceiver::Event buffer[1];
+
+ static nsecs_t oldTimeStamp = 0;
+
+ while ((n = q->getEvents(buffer, 1)) > 0) {
+ for (int i=0 ; i<n ; i++) {
+ if (buffer[i].header.type == DisplayEventReceiver::DISPLAY_EVENT_VSYNC) {
+ printf("event vsync: count=%d\t", buffer[i].vsync.count);
+ }
+ if (oldTimeStamp) {
+ float t = float(buffer[i].header.timestamp - oldTimeStamp) / s2ns(1);
+ printf("%f ms (%f Hz)\n", t*1000, 1.0/t);
+ }
+ oldTimeStamp = buffer[i].header.timestamp;
+ }
+ }
+ if (n<0) {
+ printf("error reading events (%s)\n", strerror(-n));
+ }
+ return 1;
+}
+
+int main(int argc, char** argv)
+{
+ DisplayEventReceiver myDisplayEvent;
+
+
+ sp<Looper> loop = new Looper(false);
+ loop->addFd(myDisplayEvent.getFd(), 0, ALOOPER_EVENT_INPUT, receiver,
+ &myDisplayEvent);
+
+ do {
+ //printf("about to poll...\n");
+ int32_t ret = loop->pollOnce(-1);
+ switch (ret) {
+ case ALOOPER_POLL_WAKE:
+ //("ALOOPER_POLL_WAKE\n");
+ break;
+ case ALOOPER_POLL_CALLBACK:
+ //("ALOOPER_POLL_CALLBACK\n");
+ break;
+ case ALOOPER_POLL_TIMEOUT:
+ printf("ALOOPER_POLL_TIMEOUT\n");
+ break;
+ case ALOOPER_POLL_ERROR:
+ printf("ALOOPER_POLL_TIMEOUT\n");
+ break;
+ default:
+ printf("ugh? poll returned %d\n", ret);
+ break;
+ }
+ } while (1);
+
+ return 0;
+}