Enum png::FilterType

#[repr(u8)]
pub enum FilterType {
    NoFilter = 0,
    Sub = 1,
    Up = 2,
    Avg = 3,
    Paeth = 4,
}

The byte level filter applied to scanlines to prepare them for compression.

Compression in general benefits from repetitive data. The filter is a content-aware method of compressing the range of occurring byte values to help the compression algorithm. Note that this does not operate on pixels but on raw bytes of a scanline.

Variants

NoFilter = 0

Sub = 1

Up = 2

Avg = 3

Paeth = 4

Implementations

impl FilterType

pub fn from_u8(n: u8) -> Option<FilterType>

u8 -> Self. Temporary solution until Rust provides a canonical one.

Trait Implementations

impl Clone for FilterType

fn clone(&self) -> FilterType

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for FilterType

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

Formats the value using the given formatter.

impl Default for FilterType

fn default() -> Self

Returns the “default value” for a type.

impl PartialEq for FilterType

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

This method tests for self and other values to be equal, and is used by ==.

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

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

impl Copy for FilterType

impl Eq for FilterType

impl StructuralEq for FilterType

impl StructuralPartialEq for FilterType