Enum AlphaFilter 

pub enum AlphaFilter {
    None,
    Horizontal,
    Vertical,
    Gradient,
}

Alpha filtering method (RFC 9649 §2.7.1 Figure 10, field F).

Variants

None

No filtering: the predictor is always 0, so residuals are the alpha values themselves.

Horizontal

Horizontal: predict each value from the pixel to its left.

Vertical

Vertical: predict each value from the pixel above.

Gradient

Gradient: predict from clip(left + top − topleft).

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 Copy for AlphaFilter

impl Debug for AlphaFilter

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

Formats the value using the given formatter.

impl Eq for AlphaFilter

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 StructuralPartialEq for AlphaFilter