Enum lodepng::ffi::FilterStrategy

#[repr(C)]pub enum FilterStrategy {
    ZERO,
    MINSUM,
    ENTROPY,
    BRUTE_FORCE,
    PREDEFINED,
}

automatically use color type with less bits per pixel if losslessly possible. Default: AUTO

Variants

ZERO

every filter at zero

MINSUM

Use filter that gives minumum sum, as described in the official PNG filter heuristic.

ENTROPY

Use the filter type that gives smallest Shannon entropy for this scanline. Depending on the image, this is better or worse than minsum.

BRUTE_FORCE

Brute-force-search PNG filters by compressing each filter for each scanline. Experimental, very slow, and only rarely gives better compression than MINSUM.

PREDEFINED

use predefined_filters buffer: you specify the filter type for each scanline

Trait Implementations

impl Clone for FilterStrategy

pub fn clone(&self) -> FilterStrategy

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Copy for FilterStrategy

impl Debug for FilterStrategy

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

Formats the value using the given formatter.

impl Eq for FilterStrategy

impl PartialEq<FilterStrategy> for FilterStrategy

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

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

#[must_use]pub fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl StructuralEq for FilterStrategy

impl StructuralPartialEq for FilterStrategy