Function JxlEncoderProcessOutput 

pub unsafe extern "C-unwind" fn JxlEncoderProcessOutput(
    enc: *mut JxlEncoder,
    next_out: *mut *mut u8,
    avail_out: *mut usize,
) -> JxlEncoderStatus

Encodes a JPEG XL file using the available bytes. *avail_out indicates how many output bytes are available, and *next_out points to the input bytes. *avail_out will be decremented by the amount of bytes that have been processed by the encoder and *next_out will be incremented by the same amount, so *next_out will now point at the amount of *avail_out unprocessed bytes.

The returned status indicates whether the encoder needs more output bytes. When the return value is not JxlEncoderStatus::Error or JxlEncoderStatus::Success, the encoding requires more JxlEncoderProcessOutput calls to continue.

The caller must guarantee that *avail_out >= 32 when calling JxlEncoderProcessOutput; otherwise, JxlEncoderStatus::NeedMoreOutput will be returned. It is guaranteed that, if *avail_out >= 32, at least one byte of output will be written.

This encodes the frames and/or boxes added so far. If the last frame or last box has been added, JxlEncoderCloseInput, JxlEncoderCloseFrames and/or JxlEncoderCloseBoxes must be called before the next JxlEncoderProcessOutput call, or the codestream won’t be encoded correctly.

Parameters

• enc: Encoder object.
• next_out: Pointer to next bytes to write to.
• avail_out: Amount of bytes available starting from *next_out.

Returns

• JxlEncoderStatus::Success when encoding finished and all events handled.
• JxlEncoderStatus::Error when encoding failed, e.g. invalid input.
• JxlEncoderStatus::NeedMoreOutput more output buffer is necessary.