BQ: add setMaxDequeuedBufferCount

    // the value returned for the MIN_UNDEQUEUED_BUFFERS query to the producer.

    int mMaxAcquiredBufferCount;

    // mMaxDequeuedBufferCount is the number of buffers that the producer may

    // dequeue at one time. It defaults to 1, and can be changed by the producer

    // via setMaxDequeuedBufferCount.

    int mMaxDequeuedBufferCount;

    // mBufferHasBeenQueued is true once a buffer has been queued. It is reset

    // when something causes all buffers to be freed (e.g., changing the buffer

    // count).

    // number will fail.

    uint32_t mGenerationNumber;

    // mAsyncMode indicates whether or not async mode is enabled.

    // In async mode an extra buffer will be allocated to allow the producer to

    // enqueue buffers without blocking.

    bool mAsyncMode;

}; // class BufferQueueCore

} // namespace android

    // to discard buffers through the onBuffersReleased callback.

    virtual status_t setBufferCount(int bufferCount);

    // see IGraphicsBufferProducer::setMaxDequeuedBufferCount

    virtual status_t setMaxDequeuedBufferCount(int maxDequeuedBuffers);

    // see IGraphicsBufferProducer::setAsyncMode

    virtual status_t setAsyncMode(bool async);

    // dequeueBuffer gets the next buffer slot index for the producer to use.

    // If a buffer slot is available then that slot index is written to the

    // location pointed to by the buf argument and a status of OK is returned.

    //              * client has one or more buffers dequeued

    virtual status_t setBufferCount(int bufferCount) = 0;

    // setMaxDequeuedBufferCount sets the maximum number of buffers that can be

    // dequeued by the producer at one time. If this method succeeds, buffer

    // slots will be both unallocated and owned by the BufferQueue object (i.e.

    // they are not owned by the producer or consumer). Calling this will also

    // cause all buffer slots to be emptied. If the caller is caching the

    // contents of the buffer slots, it should empty that cache after calling

    // this method.

    //

    // This function should not be called when there are any currently dequeued

    // buffer slots. Doing so will result in a BAD_VALUE error.

    //

    // The buffer count should be at least 1 (inclusive), but at most

    // (NUM_BUFFER_SLOTS - the minimum undequeued buffer count) (exclusive). The

    // minimum undequeued buffer count can be obtained by calling

    // query(NATIVE_WINDOW_MIN_UNDEQUEUED_BUFFERS).

    //

    // Return of a value other than NO_ERROR means an error has occurred:

    // * NO_INIT - the buffer queue has been abandoned.

    // * BAD_VALUE - one of the below conditions occurred:

    //              * bufferCount was out of range (see above)

    //              * client has one or more buffers dequeued

    virtual status_t setMaxDequeuedBufferCount(int maxDequeuedBuffers) = 0;

    // Set the async flag if the producer intends to asynchronously queue

    // buffers without blocking. Typically this is used for triple-buffering

    // and/or when the swap interval is set to zero.

    //

    // Enabling async mode will internally allocate an additional buffer to

    // allow for the asynchronous behavior. If it is not enabled queue/dequeue

    // calls may block.

    //

    // This function should not be called when there are any currently dequeued

    // buffer slots, doing so will result in a BAD_VALUE error.

    //

    // Return of a value other than NO_ERROR means an error has occurred:

    // * NO_INIT - the buffer queue has been abandoned.

    // * BAD_VALUE - client has one or more buffers dequeued

    virtual status_t setAsyncMode(bool async) = 0;

    // dequeueBuffer requests a new buffer slot for the client to use. Ownership

    // of the slot is transfered to the client, meaning that the server will not

    // use the contents of the buffer associated with that slot.

    virtual int connect(int api);

    virtual int disconnect(int api);

    virtual int setBufferCount(int bufferCount);

    virtual int setMaxDequeuedBufferCount(int maxDequeuedBuffers);

    virtual int setAsyncMode(bool async);

    virtual int setBuffersDimensions(uint32_t width, uint32_t height);

    virtual int setBuffersUserDimensions(uint32_t width, uint32_t height);

    virtual int setBuffersFormat(PixelFormat format);

    mDefaultBufferDataSpace(HAL_DATASPACE_UNKNOWN),

    mDefaultMaxBufferCount(2),

    mMaxAcquiredBufferCount(1),

    mMaxDequeuedBufferCount(1),

    mBufferHasBeenQueued(false),

    mFrameCounter(0),

    mTransformHint(0),

    mIsAllocatingCondition(),

    mAllowAllocation(true),

    mBufferAge(0),

    mGenerationNumber(0)

    mGenerationNumber(0),

    mAsyncMode(false)

{

    if (allocator == NULL) {

        sp<ISurfaceComposer> composer(ComposerService::getComposerService());

    }

    result.appendFormat("%s-BufferQueue mMaxAcquiredBufferCount=%d, "

            "mDequeueBufferCannotBlock=%d, default-size=[%dx%d], "

            "default-format=%d, transform-hint=%02x, FIFO(%zu)={%s}\n",

            prefix, mMaxAcquiredBufferCount, mDequeueBufferCannotBlock,

            mDefaultWidth, mDefaultHeight, mDefaultBufferFormat, mTransformHint,

            mQueue.size(), fifo.string());

            "mMaxDequeuedBufferCount=%d, mDequeueBufferCannotBlock=%d, "

            "default-size=[%dx%d], default-format=%d, transform-hint=%02x, "

            "FIFO(%zu)={%s}\n",

            prefix, mMaxAcquiredBufferCount, mMaxDequeuedBufferCount,

            mDequeueBufferCannotBlock, mDefaultWidth, mDefaultHeight,

            mDefaultBufferFormat, mTransformHint, mQueue.size(), fifo.string());

    // Trim the free buffers so as to not spam the dump

    int maxBufferCount = 0;