Add support for timestamps into SurfaceTexture.

API addition: The timestamps are represented as nanoseconds from some
arbitrary time point. Like the SurfaceTexture transform matrix, the
timestamp retrieved by getTimestamp is for the last frame sent to the
GL texture using updateTexImage().

Camera HAL change: Expect vendors to set these timestamps using
native_window_set_buffers_timestamp().  For now, they are
autogenerated by SurfaceTextureClient if set_buffers_timestamp() is
never called, but such timing is likely not accurate enough to pass a
CTS test.

bug:3300707

Change-Id: Ife131a0c2a826ac27342e11b8a6c42ff49e1bea7

1 files changed, 15 insertions, 0 deletions

diff --git a/libs/surfaceflinger_client/Surface.cpp b/libs/surfaceflinger_client/Surface.cpp
index 21d509a..0dfbf01 100644
--- a/libs/surfaceflinger_client/Surface.cpp
+++ b/libs/surfaceflinger_client/Surface.cpp
@@ -753,6 +753,9 @@ int Surface::perform(int operation, va_list args)
     case NATIVE_WINDOW_SET_BUFFERS_TRANSFORM:
         res = dispatch_set_buffers_transform( args );
         break;
+    case NATIVE_WINDOW_SET_BUFFERS_TIMESTAMP:
+        res = dispatch_set_buffers_timestamp( args );
+        break;
     default:
         res = NAME_NOT_FOUND;
         break;
@@ -792,6 +795,11 @@ int Surface::dispatch_set_buffers_transform(va_list args) {
     return setBuffersTransform(transform);
 }
 
+int Surface::dispatch_set_buffers_timestamp(va_list args) {
+    int64_t timestamp = va_arg(args, int64_t);
+    return setBuffersTimestamp(timestamp);
+}
+
 void Surface::setUsage(uint32_t reqUsage)
 {
     Mutex::Autolock _l(mSurfaceLock);
@@ -910,6 +918,13 @@ int Surface::setBuffersTransform(int transform)
     return NO_ERROR;
 }
 
+int Surface::setBuffersTimestamp(int64_t timestamp)
+{
+    // Surface doesn't really have anything meaningful to do with timestamps
+    // so they'll just be dropped here.
+    return NO_ERROR;
+}
+
 // ----------------------------------------------------------------------------
 
 int Surface::getConnectedApi() const