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about clImportMemoryARM

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1， clImportMemoryARM 可以导入HAL_PIXEL_FORMAT_YCrCb_420_SP （NV21格式的图）的GraphicBuffer吗？
2， 支持cl_arm_import_memory_host的话， 任何host 端malloc出来的memory都可以 clImportMemoryARM吗， 有无约束？
3， GraphicBuffer lock&lockYCbCr 出来的内存地址（CPU可用）可否用cl_arm_import_memory_host 来clImportMemoryARM ？
4， 其他OPENCL context 关联的cl_mem map出来的host ptr 是否可以通过可否用cl_arm_import_memory_host 来clImportMemoryARM