1 files changed, 81 insertions, 0 deletions
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;
+}