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.
See Encoder::set_predefined_filters
.
Trait Implementations
sourceimpl Clone for FilterStrategy
impl Clone for FilterStrategy
sourcefn clone(&self) -> FilterStrategy
fn clone(&self) -> FilterStrategy
Returns a copy of the value. Read more
1.0.0 · sourcefn clone_from(&mut self, source: &Self)
fn clone_from(&mut self, source: &Self)
Performs copy-assignment from source
. Read more
sourceimpl Debug for FilterStrategy
impl Debug for FilterStrategy
sourceimpl PartialEq<FilterStrategy> for FilterStrategy
impl PartialEq<FilterStrategy> for FilterStrategy
impl Copy for FilterStrategy
impl Eq for FilterStrategy
impl StructuralEq for FilterStrategy
impl StructuralPartialEq for FilterStrategy
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
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more