commit bc2df65a3f3f4b8abaaaa2a4e576a3a42c2d30f3
author Eino-Ville Talvala <etalvala@google.com> Thu Jul 21 17:06:58 2016 -0700
committer Eino-Ville Talvala <etalvala@google.com> Fri Jul 22 12:27:04 2016 -0700
tree 1d161800a08d5ea3ed3088a5c224173665267769
parent d16f6ae2bd1083ee29717829a39e93908bba2bf5

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

libs/gui/IGraphicBufferConsumer.cpp

diff --git a/libs/gui/IGraphicBufferConsumer.cpp b/libs/gui/IGraphicBufferConsumer.cpp
index 7c4379f..c8eff00 100644
--- a/libs/gui/IGraphicBufferConsumer.cpp
+++ b/libs/gui/IGraphicBufferConsumer.cpp
@@ -52,6 +52,7 @@
     SET_TRANSFORM_HINT,
     GET_SIDEBAND_STREAM,
     GET_OCCUPANCY_HISTORY,
+    DISCARD_FREE_BUFFERS,
     DUMP,
 };
 
@@ -286,6 +287,21 @@
         return result;
     }
 
+    virtual status_t discardFreeBuffers() {
+        Parcel data, reply;
+        data.writeInterfaceToken(IGraphicBufferConsumer::getInterfaceDescriptor());
+        status_t error = remote()->transact(DISCARD_FREE_BUFFERS, data, &reply);
+        if (error != NO_ERROR) {
+            return error;
+        }
+        int32_t result = NO_ERROR;
+        error = reply.readInt32(&result);
+        if (error != NO_ERROR) {
+            return error;
+        }
+        return result;
+    }
+
     virtual void dump(String8& result, const char* prefix) const {
         Parcel data, reply;
         data.writeInterfaceToken(IGraphicBufferConsumer::getInterfaceDescriptor());
@@ -454,6 +470,12 @@
             }
             return NO_ERROR;
         }
+        case DISCARD_FREE_BUFFERS: {
+            CHECK_INTERFACE(IGraphicBufferConsumer, data, reply);
+            status_t result = discardFreeBuffers();
+            status_t error = reply->writeInt32(result);
+            return error;
+        }
         case DUMP: {
             CHECK_INTERFACE(IGraphicBufferConsumer, data, reply);
             String8 result = data.readString8();