Reading requires mutability?

[justmytwospence]

Hi I'm brand spanking new to memory management. It seems to make things difficult unnecessarily that using read_pixel requires mutability. Is there a reason this is the case that I'm not understanding?

[pka]

Fair question. Since the reader state is stored directly in the reader struct, internal data (read position, data buffer) is updated when reading. That said, Rust has a pattern called "interior mutability" to hide internal mutations. PR welcome...