JxlDecoderSizeHintBasicInfo

jpegxl_sys::decode

Function JxlDecoderSizeHintBasicInfo 

Source 
pub unsafe extern "C-unwind" fn JxlDecoderSizeHintBasicInfo(
    dec: *const JxlDecoder,
) -> usize
Expand description

Returns a hint indicating how many more bytes the decoder is expected to need to make JxlDecoderGetBasicInfo available after the next JxlDecoderProcessInput call. This is a suggested large enough value for the amount of bytes to provide in the next JxlDecoderSetInput call, but it is not guaranteed to be an upper bound nor a lower bound. This number does not include bytes that have already been released from the input. Can be used before the first JxlDecoderProcessInput call, and is correct the first time in most cases. If not, JxlDecoderSizeHintBasicInfo can be called again to get an updated hint.

§Parameters

  • dec: decoder object

§Returns

  • the size hint in bytes if the basic info is not yet fully decoded.
  • 0 when the basic info is already available.