Enum InterpolationAlphaSpace 

pub enum InterpolationAlphaSpace {
    Premultiplied = 0,
    Unpremultiplied = 1,
}

Defines how color channels should be handled when interpolating between transparent colors.

Variants

Premultiplied = 0

Colors are interpolated with their color channels premultiplied by the alpha channel. This is almost always what you want.

Used when interpolating colors in the premultiplied alpha space, which allows for correct interpolation when colors are transparent. This matches behavior described in CSS Color Module Level 4 § 12.3.

Following the convention of CSS Color Module Level 4, in cylindrical color spaces the hue channel is not premultiplied. If it were, interpolation would give undesirable results. See also color::PremulColor.

Unpremultiplied = 1

Colors are interpolated without premultiplying their color channels by the alpha channel.

This causes color information to leak out of transparent colors. For example, when interpolating from a fully transparent red to a fully opaque blue in sRGB, this method will go through an intermediate purple.

Used when interpolating colors in the unpremultiplied (straight) alpha space. This matches behavior of gradients in the HTML canvas element. See The 2D rendering context § Fill and stroke styles.

Trait Implementations

impl Clone for InterpolationAlphaSpace

fn clone(&self) -> InterpolationAlphaSpace

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for InterpolationAlphaSpace

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

Formats the value using the given formatter.

impl Default for InterpolationAlphaSpace

fn default() -> InterpolationAlphaSpace

Returns the “default value” for a type.

impl PartialEq for InterpolationAlphaSpace

fn eq(&self, other: &InterpolationAlphaSpace) -> 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 Copy for InterpolationAlphaSpace

impl StructuralPartialEq for InterpolationAlphaSpace