Enum InterpType

#[non_exhaustive]
pub enum InterpType {
    Nearest,
    Tiles,
    Bilinear,
    Hyper,
}

Interpolation modes for scaling functions.

The GDK_INTERP_NEAREST mode is the fastest scaling method, but has horrible quality when scaling down; GDK_INTERP_BILINEAR is the best choice if you aren’t sure what to choose, it has a good speed/quality balance.

Note: Cubic filtering is missing from the list; hyperbolic interpolation is just as fast and results in higher quality.

Variants (Non-exhaustive)

Non-exhaustive enums could have additional variants added in future. Therefore, when matching against variants of non-exhaustive enums, an extra wildcard arm must be added to account for any future variants.

Nearest

Nearest neighbor sampling; this is the fastest and lowest quality mode. Quality is normally unacceptable when scaling down, but may be OK when scaling up.

Tiles

This is an accurate simulation of the PostScript image operator without any interpolation enabled. Each pixel is rendered as a tiny parallelogram of solid color, the edges of which are implemented with antialiasing. It resembles nearest neighbor for enlargement, and bilinear for reduction.

Bilinear

Best quality/speed balance; use this mode by default. Bilinear interpolation. For enlargement, it is equivalent to point-sampling the ideal bilinear-interpolated image. For reduction, it is equivalent to laying down small tiles and integrating over the coverage area.

Hyper

This is the slowest and highest quality reconstruction function. It is derived from the hyperbolic filters in Wolberg’s “Digital Image Warping”, and is formally defined as the hyperbolic-filter sampling the ideal hyperbolic-filter interpolated image (the filter is designed to be idempotent for 1:1 pixel mapping). Deprecated: this interpolation filter is deprecated, as in reality it has a lower quality than the @GDK_INTERP_BILINEAR filter (Since: 2.38)

Trait Implementations

impl Clone for InterpType

fn clone(&self) -> InterpType

Returns a copy of the value.

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

Performs copy-assignment from source.

impl Debug for InterpType

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

Formats the value using the given formatter.

impl From<InterpType> for Value

fn from(v: InterpType) -> Self

Converts to this type from the input type.

impl<'a> FromValue<'a> for InterpType

type Checker = GenericValueTypeChecker<InterpType>

Value type checker.

unsafe fn from_value(value: &'a Value) -> Self

Get the contained value from a Value.

impl HasParamSpec for InterpType

type ParamSpec = ParamSpecEnum

type SetValue = InterpType

Preferred value to be used as setter for the associated ParamSpec.

type BuilderFn = fn(_: &str, _: InterpType) -> ParamSpecEnumBuilder<'_, InterpType>

fn param_spec_builder() -> Self::BuilderFn

impl Hash for InterpType

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

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 Ord for InterpType

fn cmp(&self, other: &InterpType) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

where Self: Sized,

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

where Self: Sized,

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

where Self: Sized,

Restrict a value to a certain interval.

impl PartialEq for InterpType

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

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl PartialOrd for InterpType

fn partial_cmp(&self, other: &InterpType) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

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

Tests less than (for self and other) and is used by the < operator.

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

Tests less than or equal to (for self and other) and is used by the <= operator.

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

Tests greater than (for self and other) and is used by the > operator.

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

Tests greater than or equal to (for self and other) and is used by the >= operator.

impl StaticType for InterpType

fn static_type() -> Type

Returns the type identifier of Self.

impl ToValue for InterpType

fn to_value(&self) -> Value

Convert a value to a Value.

fn value_type(&self) -> Type

Returns the type identifier of self.

impl ValueType for InterpType

type Type = InterpType

Type to get the Type from.

impl Copy for InterpType

impl Eq for InterpType

impl StructuralPartialEq for InterpType