發(fā)現(xiàn)一個比較好的介紹graphic帖子， 后面會跟著帖子來梳理下graphic相關(guān)知識點
http://blog.csdn.net/u014409795/article/details/51276468

創(chuàng)新互聯(lián)公司是一家專業(yè)提供青秀企業(yè)網(wǎng)站建設(shè),專注與成都網(wǎng)站設(shè)計、成都做網(wǎng)站、H5技術(shù)、小程序制作等業(yè)務(wù)。10年已為青秀眾多企業(yè)、政府機(jī)構(gòu)等服務(wù)。創(chuàng)新互聯(lián)專業(yè)的建站公司優(yōu)惠進(jìn)行中。

1. BufferQueue

      class BufferQueue {
             class ProxyConsumerListener : public BnConsumerListener;
             static void createBufferQueue(sp<IGraphicBufferProducer>* outProducer,
                       sp<IGraphicBufferConsumer>* outConsumer,
                        const sp<IGraphicBufferAlloc>& allocator = NULL);
        private:
            BufferQueue(); // Create through createBufferQueue

    }

    //看起來只有consumer一個角色？

   void BufferQueue::createBufferQueue(sp<IGraphicBufferProducer>* outProducer,
       sp<IGraphicBufferConsumer>* outConsumer,
       const sp<IGraphicBufferAlloc>& allocator) {

       sp<BufferQueueCore> core(new BufferQueueCore(allocator));
       sp<IGraphicBufferProducer> producer(new BufferQueueProducer(core));

       sp<IGraphicBufferConsumer> consumer(new BufferQueueConsumer(core));

 BufferQueue核心是BufferQueueCore,

  看BufferQueueCore里面是管理什么的

 class BufferQueueCore : public virtual RefBase {

          friend class BufferQueueProducer;
          friend class BufferQueueConsumer;

          typedef Vector<BufferItem> Fifo; //一個BufferItem Vector

        private:

        // mAllocator is the connection to SurfaceFlinger that is used to allocate
        // new GraphicBuffer objects.
       sp<IGraphicBufferAlloc> mAllocator;
        // mSlots is an array of buffer slots that must be mirrored on the producer
       // side. This allows buffer ownership to be transferred between the producer
       // and consumer without sending a GraphicBuffer over Binder. The entire
      // array is initialized to NULL at construction time, and buffers are
      // allocated for a slot when requestBuffer is called with that slot's index.
       BufferQueueDefs::SlotsType mSlots;  //

       BufferSlot()
   : mEglDisplay(EGL_NO_DISPLAY),
     mBufferState(BufferSlot::FREE),   //state
     mRequestBufferCalled(false),
     mFrameNumber(0),
     mEglFence(EGL_NO_SYNC_KHR),
     mAcquireCalled(false),
     mNeedsCleanupOnRelease(false),
     mAttachedByConsumer(false) {
   }

   // mGraphicBuffer points to the buffer allocated for this slot or is NULL
   // if no buffer has been allocated.
   sp<GraphicBuffer> mGraphicBuffer;  //bufferslot中指向GraphicBuffer

   enum BufferState { // state 表示buffer state

    FREE = 0,  //FREE indicates that the buffer is available to be dequeued by the producer.
     // 允許produce獲取該buffer，填充數(shù)據(jù)，狀態(tài)變?yōu)閐equeue   free 時表示該buffer還被bufferqueue 所有

  DEQUEUED = 1,// DEQUEUED indicates that the buffer has been dequeued by the  producer, but has not yet been queued or canceled. The slot is "owned" by the producer. 處于待填充數(shù)據(jù)狀態(tài),被producer所有

 QUEUED = 2,//QUEUED indicates that the buffer has been filled by the producer and queued for use by the consumer; producer填充完數(shù)據(jù)，準(zhǔn)備提供給consumer消費，被bufferqueue所有

  ACQUIRED = 3//ACQUIRED indicates that the buffer has been acquired by the  consumer.

  buffer被consumer獲取到，消費完后轉(zhuǎn)為free

  在bufferqueuecore中bufferItem又是什么
  class BufferItem : public Flattenable<BufferItem> {

  // mGraphicBuffer points to the buffer allocated for this slot, or is NULL
   // if the buffer in this slot has been acquired in the past (see
   // BufferSlot.mAcquireCalled).
   sp<GraphicBuffer> mGraphicBuffer; //也有GraphicBuffer指針

    union {
       // mSlot is the slot index of this buffer (default INVALID_BUFFER_SLOT).
       int mSlot; // slot數(shù)組中索引

       // mBuf is the former name for mSlot
       int mBuf; // 舊名字
   };

  BufferSlot 與 BufferItem 都指向GraphicBuffer,然后又 通過mSlot下標(biāo)關(guān)聯(lián)起來，至于兩者使用場景再看

另外有需要云服務(wù)器可以了解下創(chuàng)新互聯(lián)scvps.cn，海內(nèi)外云服務(wù)器15元起步，三天無理由+7*72小時售后在線，公司持有idc許可證，提供“云服務(wù)器、裸金屬服務(wù)器、高防服務(wù)器、香港服務(wù)器、美國服務(wù)器、虛擬主機(jī)、免備案服務(wù)器”等云主機(jī)租用服務(wù)以及企業(yè)上云的綜合解決方案，具有“安全穩(wěn)定、簡單易用、服務(wù)可用性高、性價比高”等特點與優(yōu)勢，專為企業(yè)上云打造定制，能夠滿足用戶豐富、多元化的應(yīng)用場景需求。

分享標(biāo)題：Graphic學(xué)習(xí)筆記-創(chuàng)新互聯(lián)
分享鏈接：http://www.rwnh.cn/article0/ccidoo.html

成都網(wǎng)站建設(shè)公司_創(chuàng)新互聯(lián)，為您提供網(wǎng)站維護(hù)、網(wǎng)站內(nèi)鏈、搜索引擎優(yōu)化、企業(yè)建站、App設(shè)計、商城網(wǎng)站

廣告

聲明：本網(wǎng)站發(fā)布的內(nèi)容（圖片、視頻和文字）以用戶投稿、用戶轉(zhuǎn)載內(nèi)容為主，如果涉及侵權(quán)請盡快告知，我們將會在第一時間刪除。文章觀點不代表本網(wǎng)站立場，如需處理請聯(lián)系客服。電話：028-86922220；郵箱：631063699@qq.com。內(nèi)容未經(jīng)允許不得轉(zhuǎn)載，或轉(zhuǎn)載時需注明來源： 創(chuàng)新互聯(lián)