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status_t BufferQueueProducer::queueBuffer(


int


slot,





const


QueueBufferInput &input, QueueBufferOutput *output) {






ATRACE_CALL();





...





BufferItem item;





{


// Autolock scope





...





output->width = mCore->mDefaultWidth;





output->height = mCore->mDefaultHeight;





output->transformHint = mCore->mTransformHintInUse = mCore->mTransformHint;





output->numPendingBuffers = static_cast<uint32_t>(mCore->mQueue.size());





output->nextFrameNumber = mCore->mFrameCounter +


1


;





ATRACE_INT(mCore->mConsumerName.string(),





static_cast<int32_t>(mCore->mQueue.size()));


//知识点1





...





}


// Autolock scope





// Wait without lock held





if


(connectedApi == NATIVE_WINDOW_API_EGL) {






// Waiting here allows for two full buffers to be queued but not a





// third. In the event that frames take varying time, this makes a





// small trade-off in favor of latency rather than throughput.





lastQueuedFence->waitForever(


"Throttling EGL Production"


);


//知识点2





}





return


NO_ERROR;



}