Struct Argb 

pub struct Argb {
    pub a: u8,
    pub r: u8,
    pub g: u8,
    pub b: u8,
}

A resolved draw colour: straight (non-premultiplied) RGB plus an alpha.

Hash because a stencil’s ink is part of a rendered image’s cache key (crate::imagecache::PixmapRequest): four bytes with a derived Eq, so the derived hash agrees with it by construction.

Fields

a: u8

Alpha, 0 fully transparent.

r: u8

Red.

g: u8

Green.

b: u8

Blue.

Implementations

impl Argb

pub const TRANSPARENT: Self

Fully transparent — also the 0xFFFFFFFF sentinel’s result.

pub const BLACK: Self

Opaque black.

pub const WHITE: Self

Opaque white.

pub const fn new(a: u8, r: u8, g: u8, b: u8) -> Self

A colour from straight RGBA bytes.

pub const fn opaque(r: u8, g: u8, b: u8) -> Self

An opaque colour from RGB bytes.

pub fn is_invisible(self) -> bool

Whether anything would be painted. PDFium tests the whole 32-bit word (if (fill_color || stroke_color)), so a colour of exactly 0x00000000 skips the draw — which is the same predicate.

pub fn to_peniko(self) -> Color

As a peniko::Color, the vocabulary both backends speak.

pub const fn with_alpha(self, a: u8) -> Self

The same colour with a different alpha.

Trait Implementations

impl Clone for Argb

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for Argb

impl Debug for Argb

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

Formats the value using the given formatter.

impl Eq for Argb

impl Hash for Argb

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 Argb

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Argb