Struct SamplingFactors 

pub struct SamplingFactors {
    pub max_h: u8,
    pub max_v: u8,
    /* private fields */
}

Per-component (H, V) sampling factors, stored in declaration order.

Fields

max_h: u8

max(H_i) across components — MCU width in data units.

max_v: u8

max(V_i) across components — MCU height in data units.

Implementations

impl SamplingFactors

pub fn from_components( components: &[(u8, u8)], ) -> Result<Self, SamplingFactorsError>

Build sampling metadata from component (H, V) factors.

Errors

Returns SamplingFactorsError when no components are supplied, more than four components are supplied, or any sampling factor is outside the JPEG legal range 1..=4.

pub fn len(&self) -> usize

Number of declared components.

pub fn is_empty(&self) -> bool

True when no components were declared.

pub fn component(&self, index: usize) -> Option<(u8, u8)>

Sampling factors for a component by declaration index.

pub fn components(&self) -> &[(u8, u8)]

Sampling factors in component declaration order.

Trait Implementations

impl Clone for SamplingFactors

fn clone(&self) -> SamplingFactors

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for SamplingFactors

impl Debug for SamplingFactors

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

Formats the value using the given formatter.

impl Eq for SamplingFactors

impl PartialEq for SamplingFactors

fn eq(&self, other: &SamplingFactors) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for SamplingFactors