Enum lodepng::ffi::FilterStrategy
source · [−]#[repr(C)]
pub enum FilterStrategy {
ZERO,
MINSUM,
ENTROPY,
BRUTE_FORCE,
PREDEFINED,
}
Expand description
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
Auto Trait Implementations
impl RefUnwindSafe for FilterStrategy
impl Send for FilterStrategy
impl Sync for FilterStrategy
impl Unpin for FilterStrategy
impl UnwindSafe for FilterStrategy
Blanket Implementations
Mutably borrows from an owned value. Read more