def cl_is_grey(p_rgb, p_cl_context: cl.Context, p_cl_queue: cl.CommandQueue,
p_cl_program: cl.Program) -> bool:
"""Check if an image is grey using OpenCL"""
pixels = numpy.array(p_rgb)
dev_buf = cl.image_from_array(p_cl_context, pixels, 4)
color = numpy.uint32(0)
dev_color = cl.Buffer(p_cl_context,
cl.mem_flags.COPY_HOST_PTR,
hostbuf=color)
p_cl_program.isGrey(p_cl_queue, (pixels.shape[0], pixels.shape[1]), None,
dev_buf, dev_color)
nb_colors = numpy.empty_like(color)
cl.enqueue_copy(p_cl_queue, nb_colors, dev_color)
return bool(nb_colors == 0)
