Struct ParamQcd 

pub struct ParamQcd { /* private fields */ }

QCD/QCC marker segment — quantization parameters.

Defines the quantization step sizes for all subbands (QCD = default, QCC = per-component override). For reversible transforms, the step sizes encode exponent information; for irreversible transforms, mantissa+exponent pairs are stored.

Implementations

impl ParamQcd

pub fn new_qcc(comp_idx: u16) -> Self

Creates a new QCC (per-component quantization) instance.

pub fn set_delta(&mut self, delta: f32)

Sets the base quantization step size (Δ) for irreversible coding.

Typical values are in the range 0.0001–1.0. Smaller values yield higher quality and larger files.

pub fn set_delta_for_comp(&mut self, comp_idx: u32, delta: f32)

Sets the base quantization step size for a specific component.

pub fn get_num_guard_bits(&self) -> u32

Returns the number of guard bits.

pub fn get_magb(&self) -> u32

pub fn get_kmax( &self, _num_decompositions: u32, resolution: u32, subband: u32, ) -> u32

pub fn get_irrev_delta( &self, _num_decompositions: u32, resolution: u32, subband: u32, ) -> f32

pub fn check_validity(&mut self, siz: &ParamSiz, cod: &ParamCod) -> Result<()>

pub fn get_qcc(&self, comp_idx: u32) -> &ParamQcd

Get QCC for a component, or self if not found

pub fn get_or_add_qcc(&mut self, comp_idx: u32) -> &mut ParamQcd

pub fn write(&mut self, file: &mut dyn OutfileBase) -> Result<bool>

pub fn write_qcc( &self, file: &mut dyn OutfileBase, num_comps: u32, ) -> Result<bool>

pub fn read(&mut self, file: &mut dyn InfileBase) -> Result<()>

pub fn read_qcc( &mut self, file: &mut dyn InfileBase, num_comps: u32, ) -> Result<()>

Trait Implementations

impl Clone for ParamQcd

fn clone(&self) -> ParamQcd

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ParamQcd

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ParamQcd

fn default() -> Self

Returns the “default value” for a type.