Function JxlDecoderSetParallelRunner 

pub unsafe extern "C-unwind" fn JxlDecoderSetParallelRunner(
    dec: *mut JxlDecoder,
    parallel_runner: JxlParallelRunner,
    parallel_runner_opaque: *mut c_void,
) -> JxlDecoderStatus

Set the parallel runner for multithreading. May only be set before starting decoding.

Parameters

• dec: decoder object
• parallel_runner: function pointer to runner for multithreading. It may be NULL to use the default, single-threaded, runner. A multithreaded runner should be set to reach fast performance.
• parallel_runner_opaque: opaque pointer for parallel_runner.

Returns

• JxlDecoderStatus::Success if the runner was set, JxlDecoderStatus::Error otherwise (the previous runner remains set).