Enum BlendMode 

#[non_exhaustive]
pub enum BlendMode {
    Linear,
    Screen,
    Dodge,
    Burn,
    Overlay,
    Multiply,
}

Blend mode for Grid::blit_alpha, selecting how source and destination colors combine before the fg_alpha/bg_alpha factor is applied.

Linear is a straight per-channel color lerp, delegated to gem::Mix. The remaining variants are the W3C separable blend modes libtcod also offers: each computes a fully blended color per channel via alpha_blend::BlendMode (imported here under its old name, SeparableBlendMode, to avoid colliding with this module’s own BlendMode), and that result is what gets lerped against the destination by the alpha factor, in place of the source color Linear would use.

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.

Linear

Straight per-channel RGB lerp between destination and source.

Screen

Lightens: dst + src - dst * src. Always at least as light as either input.

Dodge

Brightens the destination to reflect the source (aka “color dodge”).

Burn

Darkens the destination to reflect the source (aka “color burn”).

Overlay

Multiplies or screens the colors, depending on the destination.

Multiply

Darkens: dst * src. Always at least as dark as either input; the complement of Screen.

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 Copy for BlendMode

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 Eq for BlendMode

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for BlendMode