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Commit 50101d02 authored by Dan Stoza's avatar Dan Stoza
Browse files

libgui: Add getLastQueuedBuffer to BufferQueue 

Adds the ability to get the last buffer queued to a BufferQueue plus
its acquire fence.

Bug: 27708453
Change-Id: Iee39475740b40c854a5f46178b2934fd930e61b8
parent 6328134d

include/gui/BufferQueueCore.h

+3 −0
Original line number Diff line number Diff line
@@ -319,6 +319,9 @@ private: 
        android_dataspace dataspace;

    } mSharedBufferCache;



    // The slot of the last queued buffer

    int mLastQueuedSlot;



}; // class BufferQueueCore



} // namespace android

include/gui/BufferQueueProducer.h

+4 −0
Original line number Diff line number Diff line
@@ -182,6 +182,10 @@ public: 
    // See IGraphicBufferProducer::setDequeueTimeout

    virtual status_t setDequeueTimeout(nsecs_t timeout) override;



    // See IGraphicBufferProducer::getLastQueuedBuffer

    virtual status_t getLastQueuedBuffer(sp<GraphicBuffer>* outBuffer,

            sp<Fence>* outFence) override;



private:

    // This is required by the IBinder::DeathRecipient interface

    virtual void binderDied(const wp<IBinder>& who);

include/gui/IGraphicBufferProducer.h

+9 −0
Original line number Diff line number Diff line
@@ -557,6 +557,15 @@ public: 
    //               happen because of trying to allocate/deallocate the async

    //               buffer.

    virtual status_t setDequeueTimeout(nsecs_t timeout) = 0;



    // Returns the last queued buffer along with a fence which must signal

    // before the contents of the buffer are read. If there are no buffers in

    // the queue, outBuffer will be populated with nullptr and outFence will be

    // populated with Fence::NO_FENCE

    //

    // Returns NO_ERROR or the status of the Binder transaction

    virtual status_t getLastQueuedBuffer(sp<GraphicBuffer>* outBuffer,

            sp<Fence>* outFence) = 0;

};



// ----------------------------------------------------------------------------

include/gui/Surface.h

+4 −0
Original line number Diff line number Diff line
@@ -129,6 +129,10 @@ public: 
     */

    bool waitForNextFrame(uint64_t lastFrame, nsecs_t timeout);



    // See IGraphicBufferProducer::getLastQueuedBuffer

    status_t getLastQueuedBuffer(sp<GraphicBuffer>* outBuffer,

            sp<Fence>* outFence);



protected:

    virtual ~Surface();

libs/gui/BufferQueueCore.cpp

+4 −0
Original line number Diff line number Diff line
@@ -200,6 +200,10 @@ void BufferQueueCore::clearBufferSlotLocked(int slot) { 
    }

    mSlots[slot].mFence = Fence::NO_FENCE;

    mSlots[slot].mEglDisplay = EGL_NO_DISPLAY;



    if (mLastQueuedSlot == slot) {

        mLastQueuedSlot = INVALID_BUFFER_SLOT;

    }

}



void BufferQueueCore::freeAllBuffersLocked() {