UNDERSTANDING ANDROID GRAPHICS INTERNALS – GRAPHIC BUFFER HANDLING INTERFACES

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本文解析了IGraphicBufferProducer和IGraphicBufferAlloc的定义与使用。前者作为Surface类中queueBuffer(), dequeueBuffer等操作的基础接口；后者与IGraphicBufferProducer配合实现dequeueBuffer操作。

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In this post, we touch IGraphicBufferProducer, IGraphicBufferAlloc.

IGraphicBufferProducer

Defined in include/gui/IGraphicBufferProducer.h, it was formerly known as ISurfaceTexture. It is the Interface underpinning the queueBuffer(), dequeueBuffer, requestBuffer() and cancelBuffer() operations in Surface class.

An IGraphicBufferProducer is instantiated in ISurfaceComposerClient::createSurface(); BnGraphicBufferProducer implementor is BufferQueue (declared in frameworks/native/include/gui/BufferQueue.h); In SurfaceFlinger, its subclass variant SurfaceTextureLayer with reference to SurfaceFlinger is actually used, and each instance of SurfaceTextureLayer corresponds to a Layer instance.

IGraphicBufferAlloc

Defined in framework/native/include/gui/IGraphicBufferAlloc.h, IGraphicBufferAlloc’s use is coupled with IGraphicBufferProducer to realize dequeueBuffer() operation. ISurfaceComposer::createGraphicBufferAlloc() creates the interface.

In the SurfaceFlinger, the BnGraphicBufferAlloc implementor is GraphicBufferAlloc, declared in framework/native/include/gui/GraphicBufferAlloc.h.