Enum Subsampling 

#[non_exhaustive]
pub enum Subsampling {
    None,
    Horizontal,
    Both,
}

How much the chroma channels are subsampled relative to luma.

Chroma carries far less perceptible detail than luma, so discarding three quarters of it is nearly free visually and saves a substantial fraction of the bytes. It is not free for synthetic images with hard colour edges, which is why it can be turned off.

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 — full-resolution chroma.

Horizontal

4:2:2 — chroma at half width.

Both

4:2:0 — chroma at half width and half height.

Trait Implementations

impl Clone for Subsampling

fn clone(&self) -> Subsampling

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Subsampling

impl Debug for Subsampling

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

Formats the value using the given formatter.

impl Default for Subsampling

fn default() -> Subsampling

Returns the “default value” for a type.

impl Eq for Subsampling

impl PartialEq for Subsampling

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Subsampling