Enum BlendMode 

pub enum BlendMode {
    Normal,
    Multiply,
    Screen,
    Overlay,
    Darken,
    Lighten,
    ColorDodge,
    ColorBurn,
    HardLight,
    SoftLight,
    Difference,
    Exclusion,
    Hue,
    Saturation,
    Color,
    Luminosity,
}

PDF compositing blend mode (PDF 32000-1:2008, §11.3.5).

Blend mode is a typed enum; dispatch happens in pipe::blend.

Separable vs. non-separable

The first twelve variants (Normal through Exclusion) are separable: the blend function operates independently on each colour channel. The last four (Hue through Luminosity) are non-separable: they operate on the full RGB triple (with CMYK converted to additive space first).

Normal is by far the most common; the pipeline fast-paths for it.

Variants

Normal

Standard Porter-Duff over (gfxBlendNormal).

Multiply

Cs × Cd (gfxBlendMultiply).

Screen

Cs + Cd - Cs × Cd (gfxBlendScreen).

Overlay

Hard-light of Cd over Cs (gfxBlendOverlay).

Darken

min(Cs, Cd) (gfxBlendDarken).

Lighten

max(Cs, Cd) (gfxBlendLighten).

ColorDodge

Brighten Cd to reflect Cs (gfxBlendColorDodge).

ColorBurn

Darken Cd to reflect Cs (gfxBlendColorBurn).

HardLight

Multiply or screen depending on Cs < 0.5 (gfxBlendHardLight).

SoftLight

Soft version of HardLight (gfxBlendSoftLight).

Difference

|Cd - Cs| (gfxBlendDifference).

Exclusion

Cs + Cd - 2 × Cs × Cd (gfxBlendExclusion).

Hue

Hue of Cs, saturation and luminosity of Cd (non-separable, gfxBlendHue).

Saturation

Saturation of Cs, hue and luminosity of Cd (non-separable, gfxBlendSaturation).

Color

Hue and saturation of Cs, luminosity of Cd (non-separable, gfxBlendColor).

Luminosity

Luminosity of Cs, hue and saturation of Cd (non-separable, gfxBlendLuminosity).

Trait Implementations

impl Clone for BlendMode

fn clone(&self) -> BlendMode

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for BlendMode

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

Formats the value using the given formatter.

impl Default for BlendMode

fn default() -> BlendMode

Returns the “default value” for a type.

impl Hash for BlendMode

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 PartialEq for BlendMode

fn eq(&self, other: &BlendMode) -> 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 BlendMode

impl Eq for BlendMode

impl StructuralPartialEq for BlendMode