Function lv_image_set_bitmap_map_src 

pub unsafe extern "C" fn lv_image_set_bitmap_map_src(
    obj: *mut lv_obj_t,
    src: *const lv_image_dsc_t,
)

Set an A8 bitmap mask for the image. @param obj pointer to an image object @param src an lv_image_dsc_t bitmap mask source.