libgui: Remove RefBase from BitTube
Removes RefBase from BitTube, since because it is not a Binder object,
it doesn't need to be reference-counted in this way.
In the process, we rename IDisplayEventConnection::getDataChannel to
IDEC::stealReceiveChannel to make it clearer that this is a non-const
operation on the remote end that removes its access to the receive
channel.
This also adds a couple of methods for moving the receive file
descriptor out of one BitTube and into another, since this is the
essence of the IDisplayEventConnection::stealReceiveChannel method,
and now with C++11 move semantics, we can do this without needing to
return an sp<> from EventThread's implementation of stealReceiveChannel.
Test: m -j + manual testing
Change-Id: Ibaaca2a14fb6155052fe5434c14bc3e671b43743
diff --git a/libs/gui/IDisplayEventConnection.cpp b/libs/gui/IDisplayEventConnection.cpp
index d3ee39c..a197426 100644
--- a/libs/gui/IDisplayEventConnection.cpp
+++ b/libs/gui/IDisplayEventConnection.cpp
@@ -22,7 +22,11 @@
namespace android {
-enum { GET_DATA_CHANNEL = IBinder::FIRST_CALL_TRANSACTION, SET_VSYNC_RATE, REQUEST_NEXT_VSYNC };
+enum {
+ STEAL_RECEIVE_CHANNEL = IBinder::FIRST_CALL_TRANSACTION,
+ SET_VSYNC_RATE,
+ REQUEST_NEXT_VSYNC
+};
class BpDisplayEventConnection : public BpInterface<IDisplayEventConnection> {
public:
@@ -31,11 +35,11 @@
~BpDisplayEventConnection() override;
- status_t getDataChannel(sp<gui::BitTube>* outChannel) const override {
+ status_t stealReceiveChannel(gui::BitTube* outChannel) override {
Parcel data, reply;
data.writeInterfaceToken(IDisplayEventConnection::getInterfaceDescriptor());
- remote()->transact(GET_DATA_CHANNEL, data, &reply);
- *outChannel = new gui::BitTube(reply);
+ remote()->transact(STEAL_RECEIVE_CHANNEL, data, &reply);
+ outChannel->readFromParcel(&reply);
return NO_ERROR;
}
@@ -63,11 +67,11 @@
status_t BnDisplayEventConnection::onTransact(uint32_t code, const Parcel& data, Parcel* reply,
uint32_t flags) {
switch (code) {
- case GET_DATA_CHANNEL: {
+ case STEAL_RECEIVE_CHANNEL: {
CHECK_INTERFACE(IDisplayEventConnection, data, reply);
- sp<gui::BitTube> channel;
- getDataChannel(&channel);
- channel->writeToParcel(reply);
+ gui::BitTube channel;
+ stealReceiveChannel(&channel);
+ channel.writeToParcel(reply);
return NO_ERROR;
}
case SET_VSYNC_RATE: {