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
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
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