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. See Encoder::set_predefined_filters.

Trait Implementations

impl Clone for FilterStrategy

fn clone(&self) -> FilterStrategy

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for FilterStrategy

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

Formats the value using the given formatter.

impl PartialEq<FilterStrategy> for FilterStrategy

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

impl Eq for FilterStrategy

impl StructuralEq for FilterStrategy

impl StructuralPartialEq for FilterStrategy