BufferQueue consumers: Add discardFreeBuffer method

This method releases all free buffers owned by the buffer queue,
in order to save memory (at the cost of potential future
reallocation of buffers).

Bug: 28695173
Change-Id: I458d10373e639e3144faf673af2ba01aca36e65a

1 files changed, 6 insertions, 0 deletions

diff --git a/libs/gui/BufferQueueConsumer.cpp b/libs/gui/BufferQueueConsumer.cpp
index e8860d12fe..ca2a374e16 100644
--- a/libs/gui/BufferQueueConsumer.cpp
+++ b/libs/gui/BufferQueueConsumer.cpp
@@ -725,6 +725,12 @@ status_t BufferQueueConsumer::getOccupancyHistory(bool forceFlush,
     return NO_ERROR;
 }
 
+status_t BufferQueueConsumer::discardFreeBuffers() {
+    Mutex::Autolock lock(mCore->mMutex);
+    mCore->discardFreeBuffersLocked();
+    return NO_ERROR;
+}
+
 void BufferQueueConsumer::dump(String8& result, const char* prefix) const {
     const IPCThreadState* ipc = IPCThreadState::self();
     const pid_t pid = ipc->getCallingPid();