libgui: Add getLastQueuedBuffer to BufferQueue

Adds the ability to get the last buffer queued to a BufferQueue plus
its acquire fence.

Bug: 27708453
Change-Id: Iee39475740b40c854a5f46178b2934fd930e61b8
diff --git a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
index 37b7aba..7e4e797 100644
--- a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
+++ b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.cpp
@@ -605,6 +605,12 @@
     return INVALID_OPERATION;
 }
 
+status_t VirtualDisplaySurface::getLastQueuedBuffer(
+        sp<GraphicBuffer>* /*outBuffer*/, sp<Fence>* /*outFence*/) {
+    ALOGE("getLastQueuedBuffer not supported on VirtualDisplaySurface");
+    return INVALID_OPERATION;
+}
+
 void VirtualDisplaySurface::updateQueueBufferOutput(
         const QueueBufferOutput& qbo) {
     uint32_t w, h, transformHint, numPendingBuffers;
diff --git a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
index 818d3eb..bd1cfb1 100644
--- a/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
+++ b/services/surfaceflinger/DisplayHardware/VirtualDisplaySurface.h
@@ -126,6 +126,8 @@
     virtual status_t setSharedBufferMode(bool sharedBufferMode) override;
     virtual status_t setAutoRefresh(bool autoRefresh) override;
     virtual status_t setDequeueTimeout(nsecs_t timeout) override;
+    virtual status_t getLastQueuedBuffer(sp<GraphicBuffer>* outBuffer,
+            sp<Fence>* outFence) override;
 
     //
     // Utility methods
diff --git a/services/surfaceflinger/MonitoredProducer.cpp b/services/surfaceflinger/MonitoredProducer.cpp
index 75559da..e689127 100644
--- a/services/surfaceflinger/MonitoredProducer.cpp
+++ b/services/surfaceflinger/MonitoredProducer.cpp
@@ -143,6 +143,11 @@
     return mProducer->setDequeueTimeout(timeout);
 }
 
+status_t MonitoredProducer::getLastQueuedBuffer(sp<GraphicBuffer>* outBuffer,
+        sp<Fence>* outFence) {
+    return mProducer->getLastQueuedBuffer(outBuffer, outFence);
+}
+
 IBinder* MonitoredProducer::onAsBinder() {
     return IInterface::asBinder(mProducer).get();
 }
diff --git a/services/surfaceflinger/MonitoredProducer.h b/services/surfaceflinger/MonitoredProducer.h
index 441cf50..d2b4b43 100644
--- a/services/surfaceflinger/MonitoredProducer.h
+++ b/services/surfaceflinger/MonitoredProducer.h
@@ -59,6 +59,8 @@
     virtual String8 getConsumerName() const override;
     virtual uint64_t getNextFrameNumber() const override;
     virtual status_t setDequeueTimeout(nsecs_t timeout) override;
+    virtual status_t getLastQueuedBuffer(sp<GraphicBuffer>* outBuffer,
+            sp<Fence>* outFence) override;
     virtual IBinder* onAsBinder();
     virtual status_t setSharedBufferMode(bool sharedBufferMode) override;
     virtual status_t setAutoRefresh(bool autoRefresh) override;