Channel merge

Parameters:

src_data	array of pointers to source arrays (cn items x len items) [ [B, B, …], [G, G, …], [R, R, …] ]
dst_data	destination array of interleaved values (len x cn items) [ B, G, R, B, G, R, …]
len	number of elements
cn	number of channels

// global functions

int
hal_ni_merge16u(
    const ushort** src_data,
    ushort* dst_data,
    int len,
    int cn
    );

int
hal_ni_merge32s(
    const int** src_data,
    int* dst_data,
    int len,
    int cn
    );

int
hal_ni_merge64s(
    const int64** src_data,
    int64* dst_data,
    int len,
    int cn
    );

int
hal_ni_merge8u(
    const uchar** src_data,
    uchar* dst_data,
    int len,
    int cn
    );