Enum ChromaSubsampling 

#[non_exhaustive]
pub enum ChromaSubsampling {
    None,
    HalfHorizontal,
    Quarter,
    HalfVertical,
}

YCbCr chroma subsampling (spatial resolution).

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

None

4:4:4 - No subsampling (full chroma resolution, best quality, largest files)

HalfHorizontal

4:2:2 - Half horizontal resolution

Quarter

4:2:0 - Quarter resolution (half each direction, most common)

HalfVertical

4:4:0 - Half vertical resolution

Implementations

impl ChromaSubsampling

pub const fn h_factor(&self) -> u8

Horizontal subsampling factor (1 or 2).

pub const fn v_factor(&self) -> u8

Vertical subsampling factor (1 or 2).

pub const fn h_samp_factor_luma(self) -> u8

Returns the horizontal sampling factor for luma.

This is the luma block count in horizontal direction per MCU. Returns 1 for 4:4:4/4:4:0, returns 2 for 4:2:0/4:2:2.

pub const fn v_samp_factor_luma(self) -> u8

Returns the vertical sampling factor for luma.

This is the luma block count in vertical direction per MCU. Returns 1 for 4:4:4/4:2:2, returns 2 for 4:2:0/4:4:0.

pub const fn mcu_size(self) -> usize

Returns the MCU (Minimum Coded Unit) size for this subsampling mode.

• 8 for 4:4:4 (no subsampling)
• 16 for modes with 2x sampling (4:2:0, 4:2:2, 4:4:0)

Trait Implementations

impl Clone for ChromaSubsampling

fn clone(&self) -> ChromaSubsampling

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for ChromaSubsampling

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

Formats the value using the given formatter.

impl PartialEq for ChromaSubsampling

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for ChromaSubsampling

impl Eq for ChromaSubsampling

impl StructuralPartialEq for ChromaSubsampling