[Beignet] [PATCH] utests: Add test case for image box blur.

[Zou, Nanhai]

>Please find attached the output image generated on my laptop (ASUS UX31A).

>I can only assume that some other form of tiling is used - perhaps it would be better to simply map tiled images in GTT mode to copy data to them, rather than using specialized functions (cl_mem_copy_data_tilex/tiley)?

Yes, use map_gtt makes more sense since tiled format may vary between platforms. 
Feel free to submit a patch for that.

Thanks
Zou Nanhai