1 files changed, 22 insertions, 0 deletions
diff --git a/libs/gui/BufferQueueConsumer.cpp b/libs/gui/BufferQueueConsumer.cpp
index c7d5e00326..2deef0e777 100644
--- a/libs/gui/BufferQueueConsumer.cpp
+++ b/libs/gui/BufferQueueConsumer.cpp
@@ -89,7 +89,20 @@ status_t BufferQueueConsumer::acquireBuffer(BufferItem* outBuffer,
         // the timestamps are being auto-generated by Surface. If the app isn't
         // generating timestamps explicitly, it probably doesn't want frames to
         // be discarded based on them.
+        //
+        // If the consumer is shadowing our queue, we also make sure that we
+        // don't drop so many buffers that the consumer hasn't received the
+        // onFrameAvailable callback for the buffer it acquires. That is, we
+        // want the buffer we return to be in the consumer's shadow queue.
+        size_t droppableBuffers = mCore->mConsumerShadowQueueSize > 1 ?
+                mCore->mConsumerShadowQueueSize - 1 : 0;
         while (mCore->mQueue.size() > 1 && !mCore->mQueue[0].mIsAutoTimestamp) {
+            if (mCore->mConsumerHasShadowQueue && droppableBuffers == 0) {
+                BQ_LOGV("acquireBuffer: no droppable buffers in consumer's"
+                        " shadow queue, continuing");
+                break;
+            }
+
             // If entry[1] is timely, drop entry[0] (and repeat). We apply an
             // additional criterion here: we only drop the earlier buffer if our
             // desiredPresent falls within +/- 1 second of the expected present.
@@ -124,6 +137,7 @@ status_t BufferQueueConsumer::acquireBuffer(BufferItem* outBuffer,
             }
             mCore->mQueue.erase(front);
             front = mCore->mQueue.begin();
+            --droppableBuffers;
         }
 
         // See if the front buffer is due
@@ -537,6 +551,14 @@ sp<NativeHandle> BufferQueueConsumer::getSidebandStream() const {
     return mCore->mSidebandStream;
 }
 
+void BufferQueueConsumer::setShadowQueueSize(size_t size) {
+    ATRACE_CALL();
+    BQ_LOGV("setShadowQueueSize: %zu", size);
+    Mutex::Autolock lock(mCore->mMutex);
+    mCore->mConsumerHasShadowQueue = true;
+    mCore->mConsumerShadowQueueSize = size;
+}
+
 void BufferQueueConsumer::dump(String8& result, const char* prefix) const {
     mCore->dump(result, prefix);
 }