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.

Details on how each filter works can be found in the PNG Book.

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 StructuralPartialEq for FilterType