SurfaceFlinger: expose vsync id extra buffers
Expose a function for clients to call and query the number
of extra buffers needed when vsync id is passed with the buffer.
Test: launch an app and observe systrace
Test: SF unit tests
Bug: 178148035
Change-Id: Icbeec66073feeae9768f0dcc45831b26144ab6f6
diff --git a/libs/gui/ISurfaceComposer.cpp b/libs/gui/ISurfaceComposer.cpp
index f68f3e1..e3aaf6d 100644
--- a/libs/gui/ISurfaceComposer.cpp
+++ b/libs/gui/ISurfaceComposer.cpp
@@ -1232,6 +1232,18 @@
}
return reply.readInt32();
}
+
+ status_t getExtraBufferCount(int* extraBuffers) const override {
+ Parcel data, reply;
+ data.writeInterfaceToken(ISurfaceComposer::getInterfaceDescriptor());
+ status_t err = remote()->transact(BnSurfaceComposer::GET_EXTRA_BUFFER_COUNT, data, &reply);
+ if (err != NO_ERROR) {
+ ALOGE("getExtraBufferCount failed to read data: %s (%d)", strerror(-err), err);
+ return err;
+ }
+
+ return reply.readInt32(extraBuffers);
+ }
};
// Out-of-line virtual method definition to trigger vtable emission in this
@@ -2101,6 +2113,16 @@
SAFE_PARCEL(reply->writeInt32, priority);
return NO_ERROR;
}
+ case GET_EXTRA_BUFFER_COUNT: {
+ CHECK_INTERFACE(ISurfaceComposer, data, reply);
+ int extraBuffers = 0;
+ int err = getExtraBufferCount(&extraBuffers);
+ if (err != NO_ERROR) {
+ return err;
+ }
+ SAFE_PARCEL(reply->writeInt32, extraBuffers);
+ return NO_ERROR;
+ }
default: {
return BBinder::onTransact(code, data, reply, flags);
}