Function webp_dev::sys::webp::webp_memory_write

pub unsafe fn webp_memory_write(
    data: *const u8, 
    data_size: usize, 
    picture: *const WebPPicture
) -> c_int

WebPMemoryWrite: a special WebPWriterFunction that writes to memory using the following WebPMemoryWriter object (to be set as a custom_ptr).