class ITransactionCompletedListener : public IInterface {
public:
    DECLARE_META_INTERFACE(TransactionCompletedListener)

    virtual void onTransactionCompleted(ListenerStats stats) = 0;

    virtual void onReleaseBuffer(ReleaseCallbackId callbackId, sp<Fence> releaseFence,
                                 uint32_t transformHint,
                                 uint32_t currentMaxAcquiredBufferCount) = 0;
};

正常绘制时显示完成后在 onTransactionCompleted() 执行 BufferQueueConsumer::releaseBuffer()。只有在 Layer 销毁时调用 onReleaseBuffer()。