Gpu如何将旋转后的buffer方向告诉给Surfaceflinger

 

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     |--QueueBufferInput input(timestamp, isAutoTimestamp,crop, mScalingMode, mTransform, mSwapIntervalZero, fence)

     |--mGraphicBufferProducer->queueBuffer(i, input, &output).

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  updateTexImage@GLConsumer.cpp

      |--acquireBufferLocked@GLConsumer.cpp

      |--updateAndReleaseLocked@GLConsumer.cpp

          |-- mCurrentTransform = item.mTransform;

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    |---

        const uint32_t transform(mSurfaceFlingerConsumer->getCurrentTransform());
        const uint32_t scalingMode(mSurfaceFlingerConsumer->getCurrentScalingMode());
        if ((crop != mCurrentCrop) ||
            (transform != mCurrentTransform) ||
            (scalingMode != mCurrentScalingMode))
        {
            mCurrentCrop = crop;
            mCurrentTransform = transform;
            mCurrentScalingMode = scalingMode;
            recomputeVisibleRegions = true;
        }