commit 8a9d62f6d256defd925fc09ebfb4a0f264fb4759
author Shuzhen Wang <shuzhenwang@google.com> Wed Aug 14 10:41:12 2019 -0700
committer Shuzhen Wang <shuzhenwang@google.com> Mon Dec 09 22:20:50 2019 +0000
tree 218aed3aa06bb7ba414da23f4cac98b7763db101
parent 5b8a4109f5195e3ca626ab1e6ce9bfd2d1c3f2a8

libgui: Add discardFreeBuffers callback to producer

This enables buffer producer to clear its buffer caches.

Test: Camera CTS, libgui_test
Bug: 136677409
Bug: 145617243
Change-Id: I7f46e977f3edc3b08177654531745d8ca0b86889
Merged-In: I7f46e977f3edc3b08177654531745d8ca0b86889

libs/gui/IProducerListener.cpp

diff --git a/libs/gui/IProducerListener.cpp b/libs/gui/IProducerListener.cpp
index 936063a..808e336 100644
--- a/libs/gui/IProducerListener.cpp
+++ b/libs/gui/IProducerListener.cpp
@@ -24,6 +24,7 @@
 enum {
     ON_BUFFER_RELEASED = IBinder::FIRST_CALL_TRANSACTION,
     NEEDS_RELEASE_NOTIFY,
+    ON_BUFFERS_DISCARDED,
 };
 
 class BpProducerListener : public BpInterface<IProducerListener>
@@ -56,6 +57,13 @@
         }
         return result;
     }
+
+    virtual void onBuffersDiscarded(const std::vector<int>& discardedSlots) {
+        Parcel data, reply;
+        data.writeInterfaceToken(IProducerListener::getInterfaceDescriptor());
+        data.writeInt32Vector(discardedSlots);
+        remote()->transact(ON_BUFFERS_DISCARDED, data, &reply, IBinder::FLAG_ONEWAY);
+    }
 };
 
 // Out-of-line virtual method definition to trigger vtable emission in this
@@ -76,6 +84,10 @@
     virtual bool needsReleaseNotify() override {
         return mBase->needsReleaseNotify();
     }
+
+    virtual void onBuffersDiscarded(const std::vector<int32_t>& discardedSlots) override {
+        return mBase->onBuffersDiscarded(discardedSlots);
+    }
 };
 
 IMPLEMENT_HYBRID_META_INTERFACE(ProducerListener,
@@ -92,6 +104,17 @@
             CHECK_INTERFACE(IProducerListener, data, reply);
             reply->writeBool(needsReleaseNotify());
             return NO_ERROR;
+        case ON_BUFFERS_DISCARDED: {
+            CHECK_INTERFACE(IProducerListener, data, reply);
+            std::vector<int32_t> discardedSlots;
+            status_t result = data.readInt32Vector(&discardedSlots);
+            if (result != NO_ERROR) {
+                ALOGE("ON_BUFFERS_DISCARDED failed to read discardedSlots: %d", result);
+                return result;
+            }
+            onBuffersDiscarded(discardedSlots);
+            return NO_ERROR;
+        }
     }
     return BBinder::onTransact(code, data, reply, flags);
 }
@@ -104,4 +127,7 @@
     return true;
 }
 
+void BnProducerListener::onBuffersDiscarded(const std::vector<int32_t>& /*discardedSlots*/) {
+}
+
 } // namespace android