Enum image::codecs::png::FilterType

#[non_exhaustive]
pub enum FilterType {
    NoFilter,
    Sub,
    Up,
    Avg,
    Paeth,
    Adaptive,
}

Filter algorithms used to process image data to improve compression.

The default filter is Adaptive.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

NoFilter

No processing done, best used for low bit depth grayscale or data with a low color count

Sub

Filters based on previous pixel in the same scanline

Up

Filters based on the scanline above

Avg

Filters based on the average of left and right neighbor pixels

Paeth

Algorithm that takes into account the left, upper left, and above pixels

Adaptive

Uses a heuristic to select one of the preceding filters for each scanline rather than one filter for the entire image

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<FilterType> 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