libgui: Add generation numbers to BufferQueue
This change allows producers to set a generation number on a
BufferQueue. This number will be embedded in any new GraphicBuffers
created in that BufferQueue, and attempts to attach buffers which have
a different generation number will fail.
It also plumbs the setGenerationNumber method through Surface, with the
additional effect that any buffers attached to the Surface after
setting a new generation number will automatically be updated with the
new number (as opposed to failing, as would happen on through IGBP).
Bug: 20923096
Change-Id: I32bf726b035f99c3e5834beaf76afb9f01adcbc2
diff --git a/libs/gui/IGraphicBufferProducer.cpp b/libs/gui/IGraphicBufferProducer.cpp
index 7093ffa..cfe726b 100644
--- a/libs/gui/IGraphicBufferProducer.cpp
+++ b/libs/gui/IGraphicBufferProducer.cpp
@@ -47,6 +47,7 @@
SET_SIDEBAND_STREAM,
ALLOCATE_BUFFERS,
ALLOW_ALLOCATION,
+ SET_GENERATION_NUMBER,
};
class BpGraphicBufferProducer : public BpInterface<IGraphicBufferProducer>
@@ -284,6 +285,17 @@
result = reply.readInt32();
return result;
}
+
+ virtual status_t setGenerationNumber(uint32_t generationNumber) {
+ Parcel data, reply;
+ data.writeInterfaceToken(IGraphicBufferProducer::getInterfaceDescriptor());
+ data.writeUint32(generationNumber);
+ status_t result = remote()->transact(SET_GENERATION_NUMBER, data, &reply);
+ if (result == NO_ERROR) {
+ result = reply.readInt32();
+ }
+ return result;
+ }
};
// Out-of-line virtual method definition to trigger vtable emission in this
@@ -448,6 +460,13 @@
reply->writeInt32(result);
return NO_ERROR;
}
+ case SET_GENERATION_NUMBER: {
+ CHECK_INTERFACE(IGraphicBufferProducer, data, reply);
+ uint32_t generationNumber = data.readUint32();
+ status_t result = setGenerationNumber(generationNumber);
+ reply->writeInt32(result);
+ return NO_ERROR;
+ }
}
return BBinder::onTransact(code, data, reply, flags);
}