Function JxlEncoderSetFrameDistance 

pub unsafe extern "C-unwind" fn JxlEncoderSetFrameDistance(
    options: *mut JxlEncoderFrameSettings,
    distance: f32,
) -> JxlEncoderStatus

Sets the distance level for lossy compression: target max butteraugli distance, lower = higher quality. Range: 0 .. 25. 0.0 = mathematically lossless (however, use JxlEncoderSetFrameLossless instead to use true lossless, as setting distance to 0 alone is not the only requirement). 1.0 = visually lossless. Recommended range: 0.5 .. 3.0. Default value: 1.0.

Parameters

• frame_settings: set of options and metadata for this frame. Also includes reference to the encoder object.
• distance: the distance value to set.

Returns

• JxlEncoderStatus::Success if the operation was successful, JxlEncoderStatus::Error otherwise.