Mat wrapper

type
  Mat* {.importcpp: "cv::Mat", header: cv_core_path, bycopy.} = object
    flags* {.importc: "flags".}: cint
    dims* {.importc: "dims".}: cint
    rows* {.importc: "rows".}: cint
    cols* {.importc: "cols".}: cint
    data* {.importc: "data".}: ptr cuchar
    datastart* {.importc: "datastart".}: ptr cuchar
    dataend* {.importc: "dataend".}: ptr cuchar
    datalimit* {.importc: "datalimit".}: ptr cuchar
    allocator* {.importc: "allocator".}: ptr MatAllocator
    u* {.importc: "u".}: ptr UMatData
    size* {.importc: "size".}: MatSize
    step* {.importc: "step".}: MatStep