Enum AlphaFilter 

pub enum AlphaFilter {
    None = 0,
    Horizontal = 1,
    Vertical = 2,
    Gradient = 3,
}

Alpha filtering method applied before compression.

Variants

None = 0

No filtering – data stored as-is.

Horizontal = 1

Horizontal prediction: each pixel predicted from its left neighbour.

Vertical = 2

Vertical prediction: each pixel predicted from the pixel above.

Gradient = 3

Gradient prediction: left + top - top_left, clamped to [0, 255].

Trait Implementations

impl Clone for AlphaFilter

fn clone(&self) -> AlphaFilter

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for AlphaFilter

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

Formats the value using the given formatter.

impl PartialEq for AlphaFilter

fn eq(&self, other: &AlphaFilter) -> 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 AlphaFilter

impl Eq for AlphaFilter

impl StructuralPartialEq for AlphaFilter