Constant libjxl_sys::JXL_DEC_PREVIEW_IMAGE

pub const JXL_DEC_PREVIEW_IMAGE: JxlDecoderStatus = 512;

Informative event by JxlDecoderProcessInput: Preview image, a small frame, decoded. This event can only happen if the image has a preview frame encoded. This event occurs max once for the codestream and always later than JXL_DEC_COLOR_ENCODING and before JXL_DEC_FRAME. This event is different than JXL_DEC_PREVIEW_HEADER because the latter only outputs the dimensions of the preview image.