Enum CoverFilter 

pub enum CoverFilter {
    Nearest,
    Triangle,
    CatmullRom,
    Gaussian,
    Lanczos3,
}

Available Sampling Filters.

Examples

To test the different sampling filters on a real example, you can find two examples called scaledown and scaleup in the examples directory of the crate source code.

Here is a 3.58 MiB test image that has been scaled down to 300x225 px:

Nearest Neighbor

Linear: Triangle

Cubic: Catmull-Rom

Gaussian

Lanczos with window 3

Speed

Time required to create each of the examples above, tested on an Intel i7-4770 CPU with Rust 1.37 in release mode:

Nearest	31 ms
Triangle	414 ms
CatmullRom	817 ms
Gaussian	1180 ms
Lanczos3	1170 ms

Variants

Nearest

Nearest Neighbor

Triangle

Linear Filter

CatmullRom

Cubic Filter

Gaussian

Gaussian Filter

Lanczos3

Lanczos with window 3

Trait Implementations

impl Clone for FilterType

fn clone(&self) -> FilterType

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for FilterType

impl Debug for FilterType

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

Formats the value using the given formatter.

impl<'de> Deserialize<'de> for FilterType

fn deserialize<__D>( __deserializer: __D, ) -> Result<FilterType, <__D as Deserializer<'de>>::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for FilterType

impl Hash for FilterType

fn hash<__H>(&self, state: &mut __H)

where __H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for FilterType

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

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for FilterType

fn serialize<__S>( &self, __serializer: __S, ) -> Result<<__S as Serializer>::Ok, <__S as Serializer>::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for FilterType