Enum Filter 

pub enum Filter {
    None,
    Sub,
    Up,
    Average,
    Paeth,
}

A PNG scanline filter (§9.2).

Variants

None

No transformation.

Sub

Difference from the pixel to the left.

Up

Difference from the pixel above.

Average

Difference from the mean of left and above.

Paeth

Difference from the Paeth predictor of left, above and above-left.

Implementations

impl Filter

pub fn from_byte(byte: u8) -> Result<Self>

The filter for a leading scanline byte.

Errors

Returns PixelsError::Malformed for a byte above 4.

pub const fn to_byte(self) -> u8

The byte for this filter.

Trait Implementations

impl Clone for Filter

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Filter

impl Debug for Filter

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

Formats the value using the given formatter.

impl Eq for Filter

impl PartialEq for Filter

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Filter